2,433 results on '"Andrew G"'
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2. Beyond documentary theatres : shifting iterations of documentary practices
- Author
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Lennon, Andrew G.
- Subjects
NX Arts in general ,PN Literature (General) ,PN2000 Dramatic representation. The Theater - Abstract
This thesis differentiates "documentary practices" from canonical notions of "documentary theatre forms" to demonstrate that the malleability and responsiveness of documentary practices are fundamental traits that underpin their perennial utility within shifting historical circumstances. I make the case that these traits enable the productive re-engagement with aspects of the documentary theatre canon, but also that they facilitate an increasingly expansive mobilisation of documentary practices beyond the confines of established documentary theatre forms. In this way, my thesis uncovers how documentary practices are expansively mobilised within theatrical models that resist neat classification as examples of documentary theatre, particularly within the historical context of what I term digital times. I propose that these expansive new mobilisations inextricably owe a debt to the documentary canon, but that they can be productively engaged in examining how reality and the real are experienced, understood, and communicated in the contemporary moment. Chapter One examines the productive malleability of documentary practices in the early period of canonical documentary theatres - from Piscator to Weiss. Chapter Two investigates the neo-avant-garde performance practices of the Living Theatre and Spalding Gray to examine how contextual pressures became a focal point for the mobilisation of documentary practices, particularly in work that troubles the cohesive notions of documentary theatre forms. In Chapter Three, I consider the resurgence of documentary theatre in the new millennium. I suggest through examinations of definitions and conflations that certain ambiguities occur between source and notions of fact and fiction. In a detailed analysis of Chris Goode's Weaklings (2015), I then evaluate how such ambiguities, while seemingly appropriate in respect of the performance of self-online, can be unproductive if mobilised in the process of reflecting modes of communication in digital times. Specifically, I investigate how Goode imbricates documentary and non-documentary practices in the promotion of what appears to be a total collapse between fact and fiction, both online and offline. Chapter Four foregrounds a recent trend in solo documentary storytellers via Complicité's The Encounter (2015), Unlimited Project's Paul Bright's Confessions of a Justified Sinner (2013), and Chris Thorpe and Rachel Chavkin's Confirmation (2014). I examine how the malleability of the documentary practices in these examples creates 'particular relationships' with the spectators, which enables the storyteller to foreground their embodied testimony over and above all other documentary evidence. The positioning of this individual as the fulcrum of trust in these works provokes scepticism not only about what is being communicated, but also by whom, and why, and speaks to an accelerated spectacle of individualised communication in digital times. I contend that these examples differently but strategically deploy iterations of documentary practices in response to shifting political agendas, social change, and changing appreciations of the real propelled by technological developments. I argue that deployments of documentary practices outside of normative confines of documentary theatre forms provokes thinking about the future of documentary praxis and facilitates an expansive analysis of the social, cultural, and political implications and anxieties that exist in digital times.
- Published
- 2022
3. Interactions between ice shelves and phytoplankton blooms in the Amundsen Sea, and their relevance to the Southern Ocean
- Author
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Twelves, Andrew G., Goldberg, Daniel, Gourmelen, Noel, Henley, Sian, and Thomas, Alex
- Subjects
Phytoplankton ,Antarctica ,Polynya ,Ice shelf ,Biogeochemistry ,Southern Ocean - Abstract
The coastal Southern Ocean is both highly sensitive to climate change and disproportionately important as a regulator of global carbon and nutrient fluxes. In particular, the polynyas which occur at many locations along the coastline host annual phytoplankton blooms which act as sinks of nutrients and carbon, whilst fueling the growth of higher trophic levels. Spring phytoplankton blooms in the Amundsen Sea are amongst the most intensely productive in the Southern Ocean and occur near some of the fastest melting ice shelves around Antarctica. In recent years both observations and modelling have been used to investigate the possible role of ice shelf melting in fuelling phytoplankton growth, with ice shelves implicated as sources of the dissolved iron whose scarcity would otherwise severely limit primary production. However there remains debate in the literature as to the importance of this iron limitation in comparison to light limitation, and as to the precise mechanism by which ice shelf melting enhances local iron concentrations. Meanwhile, expanded observations and advances in data assimilation have revealed pronounced zonal variation in both physical and biogeochemical aspects of oceanography near the Antarctic margin. In this thesis, idealised and realistic models of the Amundsen Sea are combined to examine the role that ice shelves play in driving Net Primary Production (NPP) in ice-free polynyas on Antarctic continental shelves, and how this role is affected by climate-driven processes. Addtionally, the impact of phytoplankton blooms themselves on the physical components of the Antarctic margin - particularly ice shelf melting and sea ice cover - are investigated. The modelling is undertaken using the MIT General Circulation Model (MITgcm) to represent ocean physics and the Biology Light Iron Nutrients and Gases (BLING) to represent biogeochemistry. This is the same combination used for the Biological Southern Ocean State Estimate (BSOSE), here modified and repurposed to study coastal processes with an emphasis on how these processes impact the wider Southern Ocean. In the first results chapter of this thesis, modelling using an idealised domain covering the Amundsen Sea Polynya (ASP) reveals transitions between light and iron limitation, with iron limitation shown to be more important a) later in the season, b) higher in the water column and c) further from the ice shelf, as compared to light limitation. Thus the categorization of the ASP as either iron or light limited is shown to be overly simplistic. Meanwhile, a significant driver of light limitation is shown to be the self-shading feedback by which surface phytoplankton reduce the light available to deeper phytoplankton. This result emphasizes the importance of including the self-shading feedback in BSOSE and in other ocean state estimates. In addition, iii the use of a simple one-dimensional Lagrangian particle-tracking model demonstrates the importance of mixing and photo-adaptation timescales in modifying the light limitation of phytoplankton blooms such as that in the ASP, motivating further studies of how different phytoplankton species adapt to fluctuating light environments. In the second results chapter, a different set of experiments on the same model setup is used to confirm that ice-shelf melting leads to greater upper ocean iron concentrations, both directly due to release of glacial iron, and indirectly via a buoyancy-driven overturning circulation which pulls iron from Circumpolar Deep Water to the surface. Both of these mechanisms drive increased NPP in front of Dotson Ice Shelf, and sensitivity experiments reveal further complexity in the coupled physical-biological system. Varying the level of shortwave radiation incident on the ocean leads to a moderate, linear response in NPP. However, varying the level of the thermocline gives a non-monotonic and counter-intuitive response. Despite increasing the amount of iron in the upper ocean, a warmer ocean does not necessarily lead to an increase in NPP, since the increased melt rate modifies coastal currents, potentially steering the iron away from where it is most limiting to phytoplankton growth. In the third results chapter, the same basic setup of MITgcm-BLING is employed in a larger, more realistic domain covering the entire Amundsen Sea sector. Notably, the phytoplankton bloom in Pine Island Polynya is shown to modify basal melting underneath the adjacent Pine Island Glacier Ice Shelf. This surprising result follows from the increased shortwave attenuation arising from high chlorophyll concentrations in the euphotic zone, which warms the sea surface whilst cooling the sub-surface. Model outputs also show that high NPP reverses the sign of the annual air-sea carbon flux on the Amundsen Sea continental shelf, with regional variability in the annual flux driven by meltwater distributions, phytoplankton blooms, and the coupling between the two. The results presented in this thesis have wider implications for studies of the Southern Ocean, including due to their novel implementation of self-shading and biophysical feedbacks within an ice-ocean model. In the final part of the thesis, a list of scenarios summarising possible future changes in the Amundsen Sea are described, encompassing changes to ice shelves, sea ice and cloud cover, as well as to the timing, magnitude and species composition of the phytoplankton bloom. Each of these scenarios has potential impacts for processes at lower latitudes, and each motivates further study of ice-ocean-biological interactions in other coastal polynyas around Antarctica.
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- 2022
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4. Transition-metal-catalysed cycloadditions and cross-coupling reactions
- Author
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Dalling, Andrew G.
- Abstract
In Chapter 2, an atom economical Rh(I)-catalysed (3+1+2) cycloaddition protocol involving cyclopropylamides, carbon monoxide and tethered alkenes is described. The methodology enables the synthesis of stereochemically complex, sp3 rich N-heterocycles. Extensive optimisation upon substrates bearing substituted cyclopropanes revealed the requirement for an ortho-methoxy substituted triarylarsine ligand in order to promote efficient cyclisation. Subsequently, the cycloaddition of a broad range of substrates was possible to deliver the target N-heterocycles with high stereoselectivity. These studies provide the first examples of multicomponent cycloadditions that proceed through C-C bond activation of “simple” electron-poor cyclopropanes. In Chapter 4, studies towards the Ir(I)-catalysed asymmetric hydroarylation of terminal alkenes to construct tertiary benzylic stereocentres is described. The synthesis of a broad range of SPINOL based chiral ligands was conducted in order to promote high enantioselectivity for the hydroheteroarylation of alkenes with furan and pyrrole-based heteroaromatics. Excellent yields and promising levels of enantioselectivity were obtained. In Chapter 5, a collaborative effort to expand the scope of the Ir(I)-catalysed hydroarylation methodology is discussed. Construction of challenging all-carbon quaternary stereocentres was achieved through the hydroarylation of 1,1-disubstituted alkenes. An insight into the mechanism of the catalytic cycle was gained through mechanistic and computational studies. These studies suggest that the hydroarylation of 1,1-disubtituted alkenes proceeds through a different pathway to previous Ir(I) catalysed hydroarylation methodologies developed at Bristol. Investigations into the development of an asymmetric protocol to construct all-carbon stereocentres are also described. Finally, in Chapter 6, the construction of challenging contiguous stereocentres is achieved through the hydroarylation of enantioenriched alkenes. The chemistry relies upon the use of an Ir(I) catalyst, modified with a chiral bisphosphite ligand. The stereochemistry of the ligand enables access to either the syn- or anti-diastereomers of the product in good yield and with high diastereoselectivity. The methodology provides an alternative to the prior art without need for prefunctionalised coupling partners.
- Published
- 2020
5. Contemporary students' approaches to learning : a case study of the relationship between assessment and approaches to learning of education students at two English universities
- Author
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Holmes, Andrew G. D. and Ecclestone, Kathryn
- Subjects
370 - Abstract
This research explores the approaches to learning of contemporary students at two northern English universities through a qualitative case study using data collected from individual semi-structured interviews with twenty undergraduates studying in the field of educational studies. The research found that although students were unaware of the terms ‘surface’ and ‘deep’ approaches to learning they recognized differences between the two. They valued personal understanding, with their general intention being to use a deep approach, that is, an intention to understand for themselves what they are studying. Students’ general approach to learning did not change as they progressed through a degree programme, yet engagement with assessment feedback, study practices and use of learning outcomes typically did. Students’ perception of assessment requirements was confirmed as being the key determinant of their approach to learning. Despite a desire to understand what they learn, contemporary students are instrumental in their approaches to learning and study practices, and where assessment does not count toward their degree classification are less likely to use a deep approach. An original contribution to knowledge is the finding that instrumentalism combines with students’ interest in, and enjoyment of, the topic studied. These are crucially important factors in their approaches to learning, and students preface the term ‘understanding’ with certain authoritative adjectives. In the light of these findings the thesis offers recommendations for improving practice to better encourage a deep approach to learning.
- Published
- 2018
6. Household and skill disaggregation in multi-sectoral models of the Scottish economy
- Author
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Ross, Andrew G.
- Subjects
338.9411 - Abstract
This thesis constructs and applies multi-sectoral models that can be used by policy makers to assess potential system-wide impacts and trade-offs of policies set out in Scotland’s Economic Strategywith particular focus on analysing the skill-dimension. This thesis begins by building a Social Accounting Matrix (SAM) for Scotland and then disaggregates this by educational characteristics of the Scottish workforce. This forms the foundation upon which subsequent modelling frameworks are developed. Next, the SAM is used to compare methods for calculating Input-Output Type II multipliers. Significant differences across these methods do not appear to be explicitly acknowledged or understood in the current literature. The potential distributional effects of exogenous demand shocks within the Scottish economy are analysed using a SAM model that contains disaggregated household accounts and two types of labour. The SAM is also used to identify the skill intensity of key structural component of the Scottish economy. The SAM is then applied to calibrate an extended version of the AMOS Computable General Equilibrium(CGE) model. This model is subsequently employed to analyse the system-wide impacts of policy relevant shocks. A variety of export demand shocks are modelled to identify the likely impacts of export orientated policies. This facilitates the separate identification of disparate labour market impacts, whilst also detailing policy relevant system-wide effects in a multi sectoral modelling framework. The skill intensity of exports, as also assessed in the SAM model, is revisited in a CGE modelling context. A key policy in the Economic Strategy is ‘to make better use of skills in the workplace’. This is interpreted as a labour augmenting efficiency improvement where fewer workers are required to produce the same level of output. Given the importance of the skill dimension alternative cases of labour-augmenting efficiency improvements are explored within the skill-disaggregated AMOS model.
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- 2017
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7. Mass-Balance-Consistent Geological Stock Accounting: A New Approach toward Sustainable Management of Mineral Resources
- Author
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Simoni, Mark U., Drielsma, Johannes A., Ericsson, Magnus, Gunn, Andrew G., Heiberg, Sigurd, Heldal, Tom A., Nassar, Nedal T., Petavratzi, Evi, Müller, Daniel B., Simoni, Mark U., Drielsma, Johannes A., Ericsson, Magnus, Gunn, Andrew G., Heiberg, Sigurd, Heldal, Tom A., Nassar, Nedal T., Petavratzi, Evi, and Müller, Daniel B.
- Abstract
Global resource extraction raises concerns about environmental pressures and the security of mineral supply. Strategies to address these concerns depend on robust information on natural resource endowments, and on suitable methods to monitor and model their changes over time. However, current mineral resources and reserves reporting and accounting workflows are poorly suited for addressing mineral depletion or answering questions about the long-term sustainable supply. Our integrative review finds that the lack of a robust theoretical concept and framework for mass-balance (MB)-consistent geological stock accounting hinders systematic industry-government data integration, resource governance, and strategy development. We evaluate the existing literature on geological stock accounting, identify shortcomings of current monitoring of mine production, and outline a conceptual framework for MB-consistent system integration based on material flow analysis (MFA). Our synthesis shows that recent developments in Earth observation, geoinformation management, and sustainability reporting act as catalysts that make MB-consistent geological stock accounting increasingly feasible. We propose first steps for its implementation and anticipate that our perspective as “resource realists” will facilitate the integration of geological and anthropogenic material systems, help secure future mineral supply, and support the global sustainability transition., Validerad;2024;Nivå 2;2024-01-16 (hanlid);Funder: Norwegian University of Science and Technology;Full text license: CC BY
- Published
- 2024
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8. Post-diagnosis physical activity and sedentary behaviour and colorectal cancer prognosis: A Global Cancer Update Programme (CUP Global) systematic literature review and meta-analysis
- Author
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Epi Kanker, Cancer, JC onderzoeksprogramma Cancer, Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C, Gunter, Marc J, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, Tsilidis, Konstantinos K, Chan, Doris S M, Epi Kanker, Cancer, JC onderzoeksprogramma Cancer, Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C, Gunter, Marc J, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, Tsilidis, Konstantinos K, and Chan, Doris S M
- Published
- 2024
9. Post-diagnosis adiposity and colorectal cancer prognosis: A Global Cancer Update Programme (CUP Global) systematic literature review and meta-analysis
- Author
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Epi Kanker, Cancer, JC onderzoeksprogramma Kanker, Becerra-Tomás, Nerea, Markozannes, Georgios, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C, Dossus, Laure, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, Tsilidis, Konstantinos K, Chan, Doris S M, Epi Kanker, Cancer, JC onderzoeksprogramma Kanker, Becerra-Tomás, Nerea, Markozannes, Georgios, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C, Dossus, Laure, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, Tsilidis, Konstantinos K, and Chan, Doris S M
- Published
- 2024
10. Post-diagnosis adiposity, physical activity, sedentary behaviour, dietary factors, supplement use and colorectal cancer prognosis: Global Cancer Update Programme (CUP Global) summary of evidence grading
- Author
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Epi Kanker, Cancer, JC onderzoeksprogramma Cancer, Tsilidis, Konstantinos K, Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C, Dossus, Laure, González-Gil, Esther M, Gunter, Marc J, Allen, Kate, Brockton, Nigel T, Croker, Helen, Gordon-Dseagu, Vanessa L, Mitrou, Panagiota, Musuwo, Nicole, Wiseman, Martin J, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, Chan, Doris S M, Epi Kanker, Cancer, JC onderzoeksprogramma Cancer, Tsilidis, Konstantinos K, Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C, Dossus, Laure, González-Gil, Esther M, Gunter, Marc J, Allen, Kate, Brockton, Nigel T, Croker, Helen, Gordon-Dseagu, Vanessa L, Mitrou, Panagiota, Musuwo, Nicole, Wiseman, Martin J, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, and Chan, Doris S M
- Published
- 2024
11. Post-diagnosis dietary factors, supplement use and colorectal cancer prognosis: A Global Cancer Update Programme (CUP Global) systematic literature review and meta-analysis
- Author
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Epi Kanker, Cancer, JC onderzoeksprogramma Kanker, Chan, Doris S M, Cariolou, Margarita, Markozannes, Georgios, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Becerra-Tomás, Nerea, Aune, Dagfinn, Greenwood, Darren C, González-Gil, Esther M, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, Tsilidis, Konstantinos K, Epi Kanker, Cancer, JC onderzoeksprogramma Kanker, Chan, Doris S M, Cariolou, Margarita, Markozannes, Georgios, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Becerra-Tomás, Nerea, Aune, Dagfinn, Greenwood, Darren C, González-Gil, Esther M, Copson, Ellen, Renehan, Andrew G, Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M, May, Anne M, Odedina, Folakemi T, Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L, Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J, Seidell, Jaap, Weijenberg, Matty P, Krebs, John, Cross, Amanda J, and Tsilidis, Konstantinos K
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- 2024
12. Long‐term shifts in phenology, thermal niche, population size, and their interactions in marine pelagic copepods
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Corona, Stefano, Hirst, Andrew G, Atkinson, David, Renz, Jasmin, Boersma, Maarten, Atkinson, Angus, Corona, Stefano, Hirst, Andrew G, Atkinson, David, Renz, Jasmin, Boersma, Maarten, and Atkinson, Angus
- Abstract
Under climatic warming many species shift their seasonal timing of life cycle events (phenology) and seasonal abundance distribution, but whether they maintain the same thermal niche is still poorly understood. Here, we studied multidecadal trends in abundance and phenology of seven major copepod species across three stations (Stonehaven (SH), Helgoland Roads (HR), and Plymouth L4) on the North–West European shelf, spanning ~ 6.5° of latitude. All seven species consistently occupied colder temperatures at the northern station compared to the southerly station, but they maintained the same realized thermal niche over years. Expected phenological shifts (i.e., earlier when warmer) in some stations were obscured possibly by the long-term drop of copepod density in spring–summer, which may be due to a variation in the food/predators abundance. The ongoing spring–summer declines in abundance (~ 50%) of many North Atlantic pelagic species over the last five decades, as found in recent studies, may have also influenced the metrics of seasonal timing. To separate the seasonal timing of life events from that of seasonal abundance distribution, we used a time series of egg production rate (EPR) of Calanus helgolandicus at L4, and found that this shifted later into the summer–autumn over the last 30 yr of warming, coincident with declining spring–summer food and increasing predator abundance. Overall, direct temperature effects do appear to influence the seasonal timing of the copepods, but to explain impacts at individual stations or long-term trends in population size or phenology, understanding the changing balance of food and predators appears to be critical.
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- 2024
13. Developing University Students’ Assessment Literacy - Theory and Practice
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Holmes, Andrew G. D. and Holmes, Andrew G. D.
- Abstract
Assessment literacy skills are increasingly recognized as being important for student success in higher education. However, as a field of study, it is not well-researched except in the context of language assessment. This paper delves into critical theoretical underpinnings and practical strategies that can be used to develop assessment literacy among university students. Based on a constructivist view, this paper discusses how social interactions and cultural practices interplay to shape students’ conceptual understanding of assessment. It argues that effective assessment literacy embodies understanding the purposes of assessment, interpreting criteria, and using feedback to improve constantly. This means integrating the development of assessment literacy into curriculum design using experiential learning and developing self-regulated learning strategies. The goal is to provide a primer for university educators and instigate reflection and debate on how best to support students when engaging with diverse assessment practices to enhance their academic achievement and skills for lifelong learning.
- Published
- 2024
14. Immune profiling in Puerto Rican injection drug users with and without HIV-1 infection
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Bennett, Sydney J., Davila, Carmen Ana, Reyes, Zahiraliz, Valentín-Acevedo, Aníbal, Carrasco, Kim Gocchi, Abadie, Roberto, Marlin, M. Caleb, Beel, Marci, Chapple, Andrew G., Fernando, Samodha C., Guthridge, Joel M., Chiou, Kathy S., Kirk, Kirk, West, John T., Wood, Charles, Bennett, Sydney J., Davila, Carmen Ana, Reyes, Zahiraliz, Valentín-Acevedo, Aníbal, Carrasco, Kim Gocchi, Abadie, Roberto, Marlin, M. Caleb, Beel, Marci, Chapple, Andrew G., Fernando, Samodha C., Guthridge, Joel M., Chiou, Kathy S., Kirk, Kirk, West, John T., and Wood, Charles
- Abstract
Antiretroviral therapy has been effective in suppressing HIV viral load and enabling people living with HIV to experience longer, more conventional lives. However, as people living with HIV are living longer, they are developing aging-related diseases prematurely and are more susceptible to comorbidities that have been linked to chronic inflammation. Coincident with HIV infection and aging, drug abuse has also been independently associated with gut dysbiosis, microbial translocation, and inflammation. Here, we hypothesized that injection drug use would exacerbate HIV-induced immune activation and inflammation, thereby intensifying immune dysfunction. We recruited 50 individuals not using injection drugs (36/50 HIV+) and 47 people who inject drugs (PWID, 12/47 HIV+). All but 3 of the HIV+ subjects were on antiretroviral therapy. Plasma immune profiles were characterized by immunoproteomics, and cellular immunophenotypes were assessed using mass cytometry. The immune profiles of HIV+/PWID−, HIV−/PWID+, and HIV+/PWID+ were each significantly different from controls; however, few differences between these groups were detected, and only 3 inflammatory mediators and 2 immune cell populations demonstrated a combinatorial effect of injection drug use and HIV infection. In conclusion, a comprehensive analysis of inflammatory mediators and cell immunophenotypes revealed remarkably similar patterns of immune dysfunction in HIV-infected individuals and in people who inject drugs with and without HIV-1 infection.
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- 2024
15. Torres Strait Finfish Fishery: Spanish mackerel stock assessment, with data to June 2023. Year Three Report.
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O'Neill, Michael F., Langstreth, Joanne C., Trappett, Andrew G., Buckworth, R.C., O'Neill, Michael F., Langstreth, Joanne C., Trappett, Andrew G., and Buckworth, R.C.
- Abstract
The Torres Strait Spanish mackerel fishery commenced in 1941. The fishery for Spanish mackerel is by line fishing only and managed as a single stock. Spanish mackerel are important to the Torres Strait people and fishing culture. They are an economic and traditional food source. The Australian Fisheries Management Authority commissioned annual updates to the Torres Strait Spanish mackerel stock assessment for three years 2021–2023. This was to support quota management and to monitor spawning biomass estimates. This stock assessment analysed data up to June 2023. The assessment was overseen by the Torres Strait Finfish Fishery Resource Assessment Group (TSFFRAG). Across analyses, the median estimated spawning biomass of Spanish mackerel in the 2022–2023 financial year (labelled the 2023 fishing year) was 41 percent of unfished estimates at the start of the fishery in 1941.
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- 2024
16. Physicochemical controls on seawater
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Turner, David R., Croot, Peter, Dickson, Andrew G., Gledhill, Martha, Turner, David R., Croot, Peter, Dickson, Andrew G., and Gledhill, Martha
- Abstract
The overriding physicochemical controls in seawater discussed here are the chemical composition and the state of master variables including temperature, pressure, salinity, pH and redox status. Dissolved Organic Matter also plays a major role, but since its properties are not sufficiently well quantified it is described as an emergent master variable at this stage. The theoretical basis for the treatment of equilibrium chemistry and kinetics is presented, together with projections of the future development of seawater chemistry resulting from climate change. Key points • Composition of seawater • Master variables (temperature, pressure, pH, oxygen/redox state) • The role of Dissolved Organic Matter • Equilibrium chemistry • Kinetics • The consequences of ongoing global changes
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- 2024
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17. Engineering new approaches for pathogen separation and detection to tackle antimicrobial resistance
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Farthing, Andrew G. and Farthing, Andrew G.
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- 2024
18. Seasonal resource tracking and use of sea-ice foraging habitats by albatrosses and large petrels
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Wakefield, Ewan D., McClymont, Erin L., Carneiro, Ana P.B., Croxall, John P., González-Solís, Jacob, Granroth-Wilding, Hannah M.V., Thorne, Lesley, Warwick-Evans, Victoria, Wood, Andrew G., Xavier, Jose C., Phillips, Richard A., Wakefield, Ewan D., McClymont, Erin L., Carneiro, Ana P.B., Croxall, John P., González-Solís, Jacob, Granroth-Wilding, Hannah M.V., Thorne, Lesley, Warwick-Evans, Victoria, Wood, Andrew G., Xavier, Jose C., and Phillips, Richard A.
- Abstract
The Antarctic seasonal sea-ice zone (SIZ) is one of the most extensive and dynamic habitats on Earth. In summer, increased insolation and ice melt cause primary production to peak, sustaining large populations of locally-breeding seabirds. Due to their hypermobility, large Procellariiformes, including albatrosses, breeding in the subantarctic also have the potential to access the SIZ and track macroscale resource waves over the Sothern Ocean but the extent to which they do this is poorly known. Here, we analysed the foraging movements of breeding albatrosses and large petrels (seven species, 1298 individuals) recorded using GPS loggers and satellite-transmitters to quantify their use of sea-ice habitats and test whether they tracked seasonal drivers of primary production. Foraging latitudes of white-chinned petrels Procellaria aequinoctialis and black-browed Thalassarche melanophris, grey-headed T. chrysostoma and wandering albatrosses Diomedea exulans varied sinusoidally over the breeding season, presumably in response to lagged effects of solar irradiance on primary production. Foraging latitudes of northern and southern giant petrels (Macronectes halli and M. giganteus), and light-mantled albatrosses Phoebetria palpebrata, exhibited no strong seasonal trend, but the latter two species spent ≥ 20 % of their time in the SIZ during incubation and post-brood, prior to or at the time of the spring ice breakup. Southern giant petrels travelled 100 s of km into the pack ice, encountering sea-ice concentrations up to 100 %, whereas light-mantled albatrosses remained almost exclusively in open water near the Marginal Ice Zone (MIZ). The remaining species spent up to 15 % of their time in the SIZ, typically from 5-7 weeks after breakup, and avoided the MIZ. This supports hypotheses that sea ice presents albatrosses but not giant petrels with physical barriers to flight or foraging, and that open-water-affiliated species use the SIZ only after primary production stimulated
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- 2024
19. “It is just a bad day”: using Rational Emotive Behaviour Therapy to bolster healthy adaptation in a Paralympic athlete
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Turner, Martin J, Wood, Andrew G, Barker, Jamie B, King, Ailish, Turner, Martin J, Wood, Andrew G, Barker, Jamie B, and King, Ailish
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The endorsement of irrational beliefs is detrimental to the psychological health of an athlete and hinders psychological resilience, that is, ability to respond to adversity in a functional and adaptive manner. In Rational Emotive Behaviour Therapy (REBT), there are some core irrational beliefs that underlie mental illness, and there are some core rational beliefs that underpin mental health. The application of clinical psychotherapeutic frameworks marks a shift in psychological interventions in sport. This chapter presents an approach that moves beyond typical psychological-skills training as would be found with the Canon of sport psychology, and expands the library of approaches from which sport psychologists are able to draw upon. It discusses intervention effects, professional competence, blurred boundaries between therapy and mental skills training, consultant’s experience, and professional practice guidelines. REBT practitioners are focused on exploring the breadth of adversities athletes may encounter, and whether their behaviours help or hinder goal achievement.
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- 2024
20. Responses of intraspecific metabolic scaling to temperature and activity differ between water- and air-breathing ectothermic vertebrates
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García-Gómez, Guillermo, Hirst, Andrew G., Spencer, Matthew, Atkinson, David, García-Gómez, Guillermo, Hirst, Andrew G., Spencer, Matthew, and Atkinson, David
- Abstract
Metabolism underpins all life-sustaining processes and varies profoundly with body size, temperature and locomotor activity. A current theory explains some of the size-dependence of metabolic rate (its mass exponent, b) through changes in metabolic level (L). We propose two predictive advances that: (a) combine the above theory with the evolved avoidance of oxygen limitation in water-breathers experiencing warming, and (b) quantify the overall magnitude of combined temperatures and degrees of locomotion on metabolic scaling across air- and water-breathers. We use intraspecific metabolic scaling responses to temperature (523 regressions) and activity (281 regressions) in diverse ectothermic vertebrates (fish, reptiles and amphibians) to show that b decreases with temperature-increased L in water-breathers, supporting surface area-related avoidance of oxygen limitation, whereas b increases with activity-increased L in air-breathers, following volume-related influences. This new theoretical integration quantitatively incorporates different influences (warming, locomotion) and respiration modes (aquatic, terrestrial) on animal energetics.
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- 2024
21. Photo-identification and satellite telemetry connect southern right whales from South Georgia Island (Islas Georgias del Sur) with multiple feeding and calving grounds in the southwest Atlantic
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Kennedy, Amy S., Carroll, Emma L., Zerbini, Alexandre N., Baker, C. Scott, Bassoi, Manuela, Beretta, Nazarena A., Buss, Danielle L., Calderan, Susannah, Cheeseman, Ted, Collins, Martin A., Costa-Urrutia, Paula, Ensor, Paul, Groch, Karina, Leaper, Russell, Olson, Paula, Passadore, Cecilia, Riet-Sapriza, Federico G., Vermeulen, Els, Vilches, Florencia, Wood, Andrew G., Jackson, Jennifer A., Kennedy, Amy S., Carroll, Emma L., Zerbini, Alexandre N., Baker, C. Scott, Bassoi, Manuela, Beretta, Nazarena A., Buss, Danielle L., Calderan, Susannah, Cheeseman, Ted, Collins, Martin A., Costa-Urrutia, Paula, Ensor, Paul, Groch, Karina, Leaper, Russell, Olson, Paula, Passadore, Cecilia, Riet-Sapriza, Federico G., Vermeulen, Els, Vilches, Florencia, Wood, Andrew G., and Jackson, Jennifer A.
- Abstract
The sub-Antarctic waters of South Georgia Island (Islas Georgias del Sur, SG/IG) are a regularly visited feeding ground for southern right whales (Eubalaena australis, SRW) in the southwest Atlantic. Satellite telemetry and photo-identification records were compared to better understand the role of SG/IG in the SRW migratory network. We present the first insights from SRW satellite-tracked from the SG/IG feeding ground, habitat use patterns in the Scotia Arc, and movements to Antarctic habitats. Photo-identification comparisons to calving and feeding areas across the South Atlantic and a review of sightings of cetaceans reported from Bird Island (west of SG/IG) since 1979 illuminate long-term habitat use patterns in SG/IG. We present the first recorded migratory movement between SG/IG and multiple countries: Argentina, Uruguay, and Brazil. Photo-identification (1) linked SG/IG to a female SRW with a long-term sighting history in Brazil, and (2) provided the first match between SG/IG and the western Antarctic Peninsula, suggesting the latter could extend the feeding area for southwest Atlantic SRW. Satellite tracking and opportunistic sightings suggest that shelf and coastal waters west of SG/IG represent an important multi-season SRW feeding habitat and add to our overall understanding of habitats and ranges occupied by recovering southwest Atlantic SRW.
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- 2024
22. Human Foot Outperforms the Hand in Mechanical Pain Discrimination
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Ng, Kevin, Lafee, Odai Waleed Mohammad, Bouchatta, Otmane, Makdani, Adarsh D., Marshall, Andrew G., Olausson, Håkan, Mcintyre, Sarah, Nagi, Saad, Ng, Kevin, Lafee, Odai Waleed Mohammad, Bouchatta, Otmane, Makdani, Adarsh D., Marshall, Andrew G., Olausson, Håkan, Mcintyre, Sarah, and Nagi, Saad
- Abstract
Tactile discrimination has been extensively studied, but mechanical pain discrimination remains poorly characterized. Here, we measured the capacity for mechanical pain discrimination using a two-alternative forced choice paradigm, with force-calibrated indentation stimuli (Semmes-Weinstein monofilaments) applied to the hand and foot dorsa of healthy human volunteers. In order to characterize the relationship between peripheral nociceptor activity and pain perception, we recorded single-unit activity from myelinated (A) and unmyelinated (C) mechanosensitive nociceptors in the skin using microneurography. At the perceptual level, we found that the foot was better at discriminating noxious forces than the hand, which stands in contrast to that for innocuous force discrimination, where the hand performed better than the foot. This observation of superior mechanical pain discrimination on the foot compared to the hand could not be explained by the responsiveness of individual nociceptors. We found no significant difference in the discrimination performance of either the myelinated or unmyelinated class of nociceptors between skin regions. This suggests the possibility that other factors such as skin biophysics, receptor density or central mechanisms may underlie these regional differences., Funding Agencies|Swedish Research Council; Knut and Alice Wallenberg Foundation; ALF Grants, Region Ostergoetland; Pain Relief Foundation, Liverpool; Svenska Laekaresaellskapet
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- 2024
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23. Uncertainty sources for measurable ocean carbonate chemistry variables
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National Science Foundation (US), National Aeronautics and Space Administration (US), National Oceanic and Atmospheric Administration (US), Commonwealth Scientific and Industrial Research Organisation (Australia), University of South Florida, Miami University, Agencia Estatal de Investigación (España), Cooperative Institute for Climate, Ocean, and Ecosystem Studies, Cooperative Institute For Marine And Atmospheric Studies (US), Carter, Brendan R., Sharp, Jonathan D., Dickson, Andrew G., Álvarez-Rodríguez, Marta, Fong, Michael B., García-Ibáñez, Maribel I., Woosley, Ryan J., Takeshita, Yuichiro, Barbero, Leticia, Byrne, Robert H., Cai, Wei-Jun, Chierici, Melissa, Clegg, Simon L., Easley, Regina A., Fassbender, Andrea J., Fleger, Kalla L., Li, Xinyu, Martín-Mayor, Macarena, Schockman ,Katelyn M., Wang, Zhaohui Aleck, National Science Foundation (US), National Aeronautics and Space Administration (US), National Oceanic and Atmospheric Administration (US), Commonwealth Scientific and Industrial Research Organisation (Australia), University of South Florida, Miami University, Agencia Estatal de Investigación (España), Cooperative Institute for Climate, Ocean, and Ecosystem Studies, Cooperative Institute For Marine And Atmospheric Studies (US), Carter, Brendan R., Sharp, Jonathan D., Dickson, Andrew G., Álvarez-Rodríguez, Marta, Fong, Michael B., García-Ibáñez, Maribel I., Woosley, Ryan J., Takeshita, Yuichiro, Barbero, Leticia, Byrne, Robert H., Cai, Wei-Jun, Chierici, Melissa, Clegg, Simon L., Easley, Regina A., Fassbender, Andrea J., Fleger, Kalla L., Li, Xinyu, Martín-Mayor, Macarena, Schockman ,Katelyn M., and Wang, Zhaohui Aleck
- Abstract
The ocean carbonate system is critical to monitor because it plays a major role in regulating Earth's climate and marine ecosystems. It is monitored using a variety of measurements, and it is commonly understood that all components of seawater carbonate chemistry can be calculated when at least two carbonate system variables are measured. However, several recent studies have highlighted systematic discrepancies between calculated and directly measured carbonate chemistry variables and these discrepancies have large implications for efforts to measure and quantify the changing ocean carbon cycle. Given this, the Ocean Carbonate System Intercomparison Forum (OCSIF) was formed as a working group through the Ocean Carbon and Biogeochemistry program to coordinate and recommend research to quantify and/or reduce uncertainties and disagreements in measurable seawater carbonate system measurements and calculations, identify unknown or overlooked sources of these uncertainties, and provide recommendations for making progress on community efforts despite these uncertainties. With this paper we aim to (1) summarize recent progress toward quantifying and reducing carbonate system uncertainties; (2) advocate for research to further reduce and better quantify carbonate system measurement uncertainties; (3) present a small amount of new data, metadata, and analysis related to uncertainties in carbonate system measurements; and (4) restate and explain the rationales behind several OCSIF recommendations. We focus on open ocean carbonate chemistry, and caution that the considerations we discuss become further complicated in coastal, estuarine, and sedimentary environments
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- 2024
24. Preventing and Controlling Zinc Deficiency Across the Life Course: A Call to Action
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Lowe, Nicola M, Hall, Andrew G., Broadley, Martin R., Foley, Jennifer, Boy, Erick, Bhutta, Zulfiqar A., Lowe, Nicola M, Hall, Andrew G., Broadley, Martin R., Foley, Jennifer, Boy, Erick, and Bhutta, Zulfiqar A.
- Abstract
Through diverse roles, zinc determines a greater number of critical life functions than any other single micronutrient. Beyond the well-recognized importance of zinc for child growth and resistance to infections, zinc has numerous specific roles covering the regulation of glucose metabolism, and growing evidence links zinc deficiency with increased risk of diabetes and cardiometabolic disorders. Zinc nutriture is thus vitally important to health across the life course. Zinc deficiency is also one of the most common forms of micronutrient malnutrition globally. A clearer estimate of the burden of health disparity attributable to zinc deficiency in adulthood and later life emerges when accounting for its contribution to global elevated fasting blood glucose and related non-communicable diseases (NCDs). Yet progress attenuating its prevalence has been limited due, in part, to the lack of sensitive and specific methods to assess human zinc status. This narrative review covers recent developments in our understanding of zinc's role in health; the impact of the changing climate and global context on zinc intake; novel functional biomarkers showing promise for monitoring population-level interventions; and solutions for improving population zinc intake. It aims to spur on implementation of evidence-based interventions for preventing and controlling zinc deficiency across the life course. Increasing zinc intake and combatting global zinc deficiency requires context-specific strategies and a combination of complementary, evidence-based interventions including supplementation, food fortification, and food and agricultural solutions such as biofortification, alongside efforts to improve zinc bioavailability. Enhancing dietary zinc content and bioavailability through zinc biofortification is an inclusive nutrition solution that can benefit the most vulnerable individuals and populations affected by inadequate diets to the greatest extent.
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- 2024
25. Artificial Precision Timing Array: bridging the decihertz gravitational-wave sensitivity gap with clock satellites
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Alves, Lucas M. B., Sullivan, Andrew G., Bartos, Imre, Veske, Doğa, Will, Sebastian, Márka, Zsuzsa, Márka, Szabolcs, Alves, Lucas M. B., Sullivan, Andrew G., Bartos, Imre, Veske, Doğa, Will, Sebastian, Márka, Zsuzsa, and Márka, Szabolcs
- Abstract
Gravitational-wave astronomy has developed enormously over the last decade with the first detections across different frequency bands, but has yet to access $0.1-10$ $\mathrm{Hz}$ gravitational waves. Gravitational waves in this band are emitted by some of the most enigmatic sources, including intermediate-mass binary black hole mergers, early inspiralling compact binaries, and possibly cosmic inflation. To tap this exciting band, we propose the construction of a detector based on pulsar timing principles, the Artificial Precision Timing Array (APTA). We envision APTA as a solar system array of artificial "pulsars"$-$precision-clock-carrying satellites that emit pulsing electromagnetic signals towards Earth or other centrum. In this fundamental study, we estimate the clock precision needed for APTA to successfully detect gravitational waves. Our results suggest that a clock relative uncertainty of $10^{-17}$, which is currently attainable, would be sufficient for APTA to surpass LISA's sensitivity in the decihertz band and observe $10^3-10^4$ $\mathrm{M}_\odot$ black hole mergers. Future atomic clock technology realistically expected in the next decade would enable the detection of an increasingly diverse set of astrophysical sources, including stellar-mass compact binaries that merge in the LIGO-Virgo-KAGRA band, extreme-mass-ratio inspirals, and Type Ia supernovae. This work opens up a new area of research into designing and constructing artificial gravitational-wave detectors relying on the successful principles of pulsar timing., Comment: 10 pages, 3 figures
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- 2024
26. Small-scale radio jets and tidal disruption events: A theory of high-luminosity compact symmetric objects
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Sullivan, Andrew G., Blandford, Roger D., Begelman, Mitchell C., Birkinshaw, Mark, Readhead, Anthony C. S., Sullivan, Andrew G., Blandford, Roger D., Begelman, Mitchell C., Birkinshaw, Mark, and Readhead, Anthony C. S.
- Abstract
Double lobe radio sources associated with active galactic nuclei represent one of the longest studied groups in radio astronomy. A particular sub-group of double radio sources comprises the compact symmetric objects (CSOs). CSOs are distinguished by their prominent double structure and sub-kpc total size. It has been argued that the vast majority of high-luminosity CSOs (CSO 2s) represent a distinct class of active galactic nuclei with its own morphological structure and life-cycle. In this work, we present theoretical considerations regarding CSO 2s. We develop a semi-analytic evolutionary model, inspired by the results of large-scale numerical simulations of relativistic jets, that reproduces the features of the radio source population. We show that CSO 2s may be generated by finite energy injections and propose stellar tidal disruption events as a possible cause. We find that tidal disruption events of giant branch stars with masses $\gtrsim1$ M$_\odot$ can fuel these sources and discuss possible approaches to confirming this hypothesis. We predict that if the tidal disruption scenario holds, CSO 2s with sizes less than 400 pc should outnumber larger sources by more than a factor of $10$. Our results motivate future numerical studies to determine whether the scenarios we consider for fueling and source evolution can explain the observed radio morphologies. Multiwavelength observational campaigns directed at these sources will also provide critical insight into the origins of these objects, their environments, and their lifespans., Comment: 9 pages, 4 figures; Accepted for publication in MNRAS
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- 2024
27. An Indocyanine Green-Based Nanoprobe for In Vivo Detection of Cellular Senescence
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Universidad de Sevilla. Departamento de Fisiología Médica y Biofísica, Baker, Andrew G., Hartono, Muhamad, Ou, Hui-Ling, Popov, Andrea Bistrovic, Brown, Emma L., Joseph, James, Golinska, Monika, Gonzalez-Gualda, Estela, Macías, David, Fruk, Ljiljana, Universidad de Sevilla. Departamento de Fisiología Médica y Biofísica, Baker, Andrew G., Hartono, Muhamad, Ou, Hui-Ling, Popov, Andrea Bistrovic, Brown, Emma L., Joseph, James, Golinska, Monika, Gonzalez-Gualda, Estela, Macías, David, and Fruk, Ljiljana
- Abstract
There is an urgent need to improve conventional cancer-treatments by preventing detrimental side effects, cancer recurrence and metastases. Recent studies have shown that presence of senescent cells in tissues treated with chemo- or radiotherapy can be used to predict the effectiveness of cancer treatment. However, although the accumulation of senescent cells is one of the hallmarks of cancer, surprisingly little progress has been made in development of strategies for their detection in vivo. To address a lack of detection tools, we developed a biocompatible, injectable organic nanoprobe (NanoJagg), which is selectively taken up by senescent cells and accumulates in the lysosomes. The NanoJagg probe is obtained by self-assembly of indocyanine green (ICG) dimers using a scalable manufacturing process and characterized by a unique spectral signature suitable for both photoacoustic tomography (PAT) and fluorescence imaging. In vitro, ex vivo and in vivo studies all indicate that NanoJaggs are a clinically translatable probe for detection of senescence and their PAT signal makes them suitable for longitudinal monitoring of the senescence burden in solid tumors after chemotherapy or radiotherapy.
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- 2024
28. Post-diagnosis adiposity and colorectal cancer prognosis:A Global Cancer Update Programme (CUP Global) systematic literature review and meta-analysis
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Becerra-Tomás, Nerea, Markozannes, Georgios, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C., Dossus, Laure, Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., Tsilidis, Konstantinos K., Chan, Doris S.M., Becerra-Tomás, Nerea, Markozannes, Georgios, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C., Dossus, Laure, Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., Tsilidis, Konstantinos K., and Chan, Doris S.M.
- Abstract
The adiposity influence on colorectal cancer prognosis remains poorly characterised. We performed a systematic review and meta-analysis on post-diagnosis adiposity measures (body mass index [BMI], waist circumference, waist-to-hip ratio, weight) or their changes and colorectal cancer outcomes. PubMed and Embase were searched through 28 February 2022. Random-effects meta-analyses were conducted when at least three studies had sufficient information. The quality of evidence was interpreted and graded by the Global Cancer Update Programme (CUP Global) independent Expert Committee on Cancer Survivorship and Expert Panel. We reviewed 124 observational studies (85 publications). Meta-analyses were possible for BMI and all-cause mortality, colorectal cancer-specific mortality, and cancer recurrence/disease-free survival. Non-linear meta-analysis indicated a reverse J-shaped association between BMI and colorectal cancer outcomes (nadir at BMI 28 kg/m2). The highest risk, relative to the nadir, was observed at both ends of the BMI distribution (18 and 38 kg/m2), namely 60% and 23% higher risk for all-cause mortality; 95% and 26% for colorectal cancer-specific mortality; and 37% and 24% for cancer recurrence/disease-free survival, respectively. The higher risk with low BMI was attenuated in secondary analyses of RCTs (compared to cohort studies), among studies with longer follow-up, and in women suggesting potential methodological limitations and/or altered physiological state. Descriptively synthesised studies on other adiposity-outcome associations of interest were limited in number and methodological quality. All the associations were graded as limited (likelihood of causality: no conclusion) due to potential methodological limitations (reverse causation, confounding, selection bias). Additional well-designed observational studies and interventional trials are needed to provide further clarification., The adiposity influence on colorectal cancer prognosis remains poorly characterised. We performed a systematic review and meta-analysis on post-diagnosis adiposity measures (body mass index [BMI], waist circumference, waist-to-hip ratio, weight) or their changes and colorectal cancer outcomes. PubMed and Embase were searched through 28 February 2022. Random-effects meta-analyses were conducted when at least three studies had sufficient information. The quality of evidence was interpreted and graded by the Global Cancer Update Programme (CUP Global) independent Expert Committee on Cancer Survivorship and Expert Panel. We reviewed 124 observational studies (85 publications). Meta-analyses were possible for BMI and all-cause mortality, colorectal cancer-specific mortality, and cancer recurrence/disease-free survival. Non-linear meta-analysis indicated a reverse J-shaped association between BMI and colorectal cancer outcomes (nadir at BMI 28 kg/m2). The highest risk, relative to the nadir, was observed at both ends of the BMI distribution (18 and 38 kg/m2), namely 60% and 23% higher risk for all-cause mortality; 95% and 26% for colorectal cancer-specific mortality; and 37% and 24% for cancer recurrence/disease-free survival, respectively. The higher risk with low BMI was attenuated in secondary analyses of RCTs (compared to cohort studies), among studies with longer follow-up, and in women suggesting potential methodological limitations and/or altered physiological state. Descriptively synthesised studies on other adiposity-outcome associations of interest were limited in number and methodological quality. All the associations were graded as limited (likelihood of causality: no conclusion) due to potential methodological limitations (reverse causation, confounding, selection bias). Additional well-designed observational studies and interventional trials are needed to provide further clarification.
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- 2024
29. Post-diagnosis dietary factors, supplement use and colorectal cancer prognosis:A Global Cancer Update Programme (CUP Global) systematic literature review and meta-analysis
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Chan, Doris S.M., Cariolou, Margarita, Markozannes, Georgios, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Becerra-Tomás, Nerea, Aune, Dagfinn, Greenwood, Darren C., González-Gil, Esther M., Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., Tsilidis, Konstantinos K., Chan, Doris S.M., Cariolou, Margarita, Markozannes, Georgios, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Becerra-Tomás, Nerea, Aune, Dagfinn, Greenwood, Darren C., González-Gil, Esther M., Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., and Tsilidis, Konstantinos K.
- Abstract
The role of diet in colorectal cancer prognosis is not well understood and specific lifestyle recommendations are lacking. We searched for randomised controlled trials (RCTs) and longitudinal observational studies on post-diagnosis dietary factors, supplement use and colorectal cancer survival outcomes in PubMed and Embase from inception until 28th February 2022. Random-effects dose–response meta-analyses were conducted when at least three studies had sufficient information. The evidence was interpreted and graded by the CUP Global independent Expert Committee on Cancer Survivorship and Expert Panel. Five RCTs and 35 observational studies were included (30,242 cases, over 8700 all-cause and 2100 colorectal cancer deaths, 3700 progression, recurrence, or disease-free events). Meta-analyses, including 3–10 observational studies each, were conducted for: whole grains, nuts/peanuts, red and processed meat, dairy products, sugary drinks, artificially sweetened beverages, coffee, alcohol, dietary glycaemic load/index, insulin load/index, marine omega-3 polyunsaturated fatty acids, supplemental calcium, circulating 25-hydroxyvitamin D (25[OH]D) and all-cause mortality; for alcohol, supplemental calcium, circulating 25(OH)D and colorectal cancer-specific mortality; and for circulating 25(OH)D and recurrence/disease-free survival. The overall evidence was graded as ‘limited’. The inverse associations between healthy dietary and/or lifestyle patterns (including diets that comprised plant-based foods), whole grains, total, caffeinated, or decaffeinated coffee and all-cause mortality and the positive associations between unhealthy dietary patterns, sugary drinks and all-cause mortality provided ‘limited—suggestive’ evidence. All other exposure-outcome associations provided ‘limited—no conclusion’ evidence. Additional, well-conducted cohort studies and carefully designed RCTs are needed to develop specific lifestyle recommendations for colorectal cancer survivors., The role of diet in colorectal cancer prognosis is not well understood and specific lifestyle recommendations are lacking. We searched for randomised controlled trials (RCTs) and longitudinal observational studies on post-diagnosis dietary factors, supplement use and colorectal cancer survival outcomes in PubMed and Embase from inception until 28th February 2022. Random-effects dose–response meta-analyses were conducted when at least three studies had sufficient information. The evidence was interpreted and graded by the CUP Global independent Expert Committee on Cancer Survivorship and Expert Panel. Five RCTs and 35 observational studies were included (30,242 cases, over 8700 all-cause and 2100 colorectal cancer deaths, 3700 progression, recurrence, or disease-free events). Meta-analyses, including 3–10 observational studies each, were conducted for: whole grains, nuts/peanuts, red and processed meat, dairy products, sugary drinks, artificially sweetened beverages, coffee, alcohol, dietary glycaemic load/index, insulin load/index, marine omega-3 polyunsaturated fatty acids, supplemental calcium, circulating 25-hydroxyvitamin D (25[OH]D) and all-cause mortality; for alcohol, supplemental calcium, circulating 25(OH)D and colorectal cancer-specific mortality; and for circulating 25(OH)D and recurrence/disease-free survival. The overall evidence was graded as ‘limited’. The inverse associations between healthy dietary and/or lifestyle patterns (including diets that comprised plant-based foods), whole grains, total, caffeinated, or decaffeinated coffee and all-cause mortality and the positive associations between unhealthy dietary patterns, sugary drinks and all-cause mortality provided ‘limited—suggestive’ evidence. All other exposure-outcome associations provided ‘limited—no conclusion’ evidence. Additional, well-conducted cohort studies and carefully designed RCTs are needed to develop specific lifestyle recommendations for colorectal cancer survivors.
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- 2024
30. Post-diagnosis physical activity and sedentary behaviour and colorectal cancer prognosis:A Global Cancer Update Programme (CUP Global) systematic literature review and meta-analysis
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Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C., Gunter, Marc J., Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., Tsilidis, Konstantinos K., Chan, Doris S.M., Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C., Gunter, Marc J., Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., Tsilidis, Konstantinos K., and Chan, Doris S.M.
- Abstract
Low physical activity and high sedentary behaviour have been clearly linked with colorectal cancer development, yet data on their potential role in colorectal cancer survival is limited. Better characterisation of these relationships is needed for the development of post-diagnosis physical activity and sedentary behaviour guidance for colorectal cancer survivors. We searched PubMed and Embase through 28 February 2022 for studies assessing post-diagnosis physical activity, and/or sedentary behaviour in relation to all-cause and cause-specific mortality and recurrence after colorectal cancer diagnosis. Total and recreational physical activity were assessed overall and by frequency, duration, intensity, and volume using categorical, linear, and non-linear dose–response random-effects meta-analyses. The Global Cancer Update Programme (CUP Global) independent Expert Committee on Cancer Survivorship and Expert Panel interpreted and graded the likelihood of causality. We identified 16 observational studies on 82,220 non-overlapping patients from six countries. Physical activity was consistently inversely associated with colorectal cancer morbidity and mortality outcomes, with 13%–60% estimated reductions in risk. Sedentary behaviour was positively associated with all-cause mortality. The evidence had methodological limitations including potential confounding, selection bias and reverse causation, coupled with a limited number of studies for most associations. The CUP Global Expert panel concluded limited-suggestive evidence for recreational physical activity with all-cause mortality and cancer recurrence. Total physical activity and its specific domains and dimensions, and sedentary behaviour were all graded as limited-no conclusion for all outcomes. Future research should focus on randomised trials, while observational studies should obtain objective and repeated physical activity measures and better adjustment for confounders., Low physical activity and high sedentary behaviour have been clearly linked with colorectal cancer development, yet data on their potential role in colorectal cancer survival is limited. Better characterisation of these relationships is needed for the development of post-diagnosis physical activity and sedentary behaviour guidance for colorectal cancer survivors. We searched PubMed and Embase through 28 February 2022 for studies assessing post-diagnosis physical activity, and/or sedentary behaviour in relation to all-cause and cause-specific mortality and recurrence after colorectal cancer diagnosis. Total and recreational physical activity were assessed overall and by frequency, duration, intensity, and volume using categorical, linear, and non-linear dose–response random-effects meta-analyses. The Global Cancer Update Programme (CUP Global) independent Expert Committee on Cancer Survivorship and Expert Panel interpreted and graded the likelihood of causality. We identified 16 observational studies on 82,220 non-overlapping patients from six countries. Physical activity was consistently inversely associated with colorectal cancer morbidity and mortality outcomes, with 13%–60% estimated reductions in risk. Sedentary behaviour was positively associated with all-cause mortality. The evidence had methodological limitations including potential confounding, selection bias and reverse causation, coupled with a limited number of studies for most associations. The CUP Global Expert panel concluded limited-suggestive evidence for recreational physical activity with all-cause mortality and cancer recurrence. Total physical activity and its specific domains and dimensions, and sedentary behaviour were all graded as limited-no conclusion for all outcomes. Future research should focus on randomised trials, while observational studies should obtain objective and repeated physical activity measures and better adjustment for confounders.
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- 2024
31. Post-diagnosis adiposity, physical activity, sedentary behaviour, dietary factors, supplement use and colorectal cancer prognosis:Global Cancer Update Programme (CUP Global) summary of evidence grading
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Tsilidis, Konstantinos K., Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C., Dossus, Laure, González-Gil, Esther M., Gunter, Marc J., Allen, Kate, Brockton, Nigel T., Croker, Helen, Gordon-Dseagu, Vanessa L., Mitrou, Panagiota, Musuwo, Nicole, Wiseman, Martin J., Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., Chan, Doris S.M., Tsilidis, Konstantinos K., Markozannes, Georgios, Becerra-Tomás, Nerea, Cariolou, Margarita, Balducci, Katia, Vieira, Rita, Kiss, Sonia, Aune, Dagfinn, Greenwood, Darren C., Dossus, Laure, González-Gil, Esther M., Gunter, Marc J., Allen, Kate, Brockton, Nigel T., Croker, Helen, Gordon-Dseagu, Vanessa L., Mitrou, Panagiota, Musuwo, Nicole, Wiseman, Martin J., Copson, Ellen, Renehan, Andrew G., Bours, Martijn, Demark-Wahnefried, Wendy, Hudson, Melissa M., May, Anne M., Odedina, Folakemi T., Skinner, Roderick, Steindorf, Karen, Tjønneland, Anne, Velikova, Galina, Baskin, Monica L., Chowdhury, Rajiv, Hill, Lynette, Lewis, Sarah J., Seidell, Jaap, Weijenberg, Matty P., Krebs, John, Cross, Amanda J., and Chan, Doris S.M.
- Abstract
Based on the World Cancer Research Fund Global Cancer Update Programme, we performed systematic reviews and meta-analyses to investigate the association of post-diagnosis adiposity, physical activity, sedentary behaviour, and dietary factors with colorectal cancer prognosis. We searched PubMed and Embase until 28th February, 2022. An independent expert committee and expert panel graded the quality of evidence. A total of 167 unique publications were reviewed, and all but five were observational studies. The quality of the evidence was graded conservatively due to the high risk of several biases. There was evidence of non-linearity in the associations between body mass index and colorectal cancer prognosis. The associations appeared reverse J-shaped, and the quality of this evidence was graded as limited (likelihood of causality: limited-no conclusion). The evidence on recreational physical activity and lower risk of all-cause mortality (relative risk [RR] highest vs. lowest: 0.69, 95% confidence interval [CI]: 0.62–0.77) and recurrence/disease-free survival (RR: 0.80, 95% CI: 0.70–0.92) was graded as limited-suggestive. There was limited-suggestive evidence for the associations between healthy dietary and/or lifestyle patterns (including diets that comprised plant-based foods), intake of whole grains and coffee with lower risk of all-cause mortality, and between unhealthy dietary patterns and intake of sugary drinks with higher risk of all-cause mortality. The evidence for other exposures on colorectal cancer outcomes was sparse and graded as limited-no conclusion. Analyses were conducted excluding cancer patients with metastases without substantial changes in the findings. Well-designed intervention and cohort studies are needed to support the development of lifestyle recommendations for colorectal cancer patients., Based on the World Cancer Research Fund Global Cancer Update Programme, we performed systematic reviews and meta-analyses to investigate the association of post-diagnosis adiposity, physical activity, sedentary behaviour, and dietary factors with colorectal cancer prognosis. We searched PubMed and Embase until 28th February, 2022. An independent expert committee and expert panel graded the quality of evidence. A total of 167 unique publications were reviewed, and all but five were observational studies. The quality of the evidence was graded conservatively due to the high risk of several biases. There was evidence of non-linearity in the associations between body mass index and colorectal cancer prognosis. The associations appeared reverse J-shaped, and the quality of this evidence was graded as limited (likelihood of causality: limited-no conclusion). The evidence on recreational physical activity and lower risk of all-cause mortality (relative risk [RR] highest vs. lowest: 0.69, 95% confidence interval [CI]: 0.62–0.77) and recurrence/disease-free survival (RR: 0.80, 95% CI: 0.70–0.92) was graded as limited-suggestive. There was limited-suggestive evidence for the associations between healthy dietary and/or lifestyle patterns (including diets that comprised plant-based foods), intake of whole grains and coffee with lower risk of all-cause mortality, and between unhealthy dietary patterns and intake of sugary drinks with higher risk of all-cause mortality. The evidence for other exposures on colorectal cancer outcomes was sparse and graded as limited-no conclusion. Analyses were conducted excluding cancer patients with metastases without substantial changes in the findings. Well-designed intervention and cohort studies are needed to support the development of lifestyle recommendations for colorectal cancer patients.
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- 2024
32. Novel Textbook Outcomes following emergency laparotomy:Delphi exercise
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Naumann, David N., Bhangu, Aneel, Brooks, Adam, Martin, Matthew, Cotton, Bryan A., Khan, Mansoor, Midwinter, Mark J., Pearce, Lyndsay, Bowley, Douglas M., Holcomb, John B., Griffiths, Ewen A., Abu-Abeid, Adam, Peckham-Cooper, Adam, Dyas, Adam R., Adeyeye, Ademola, Dogjani, Agron, Ball, Alasdair C.Y., Wolthuis, Albert M., Quiroga-Garza, Alejandro, Karamarkovic, Aleksandar R., Giordano, Alessio, Fuchs, Alexander, Julianov, Alexander, Phillips, Alexander W., Zimmermann, Alexander, Charalabopoulos, Alexandros, Birkun, Alexei A., Narvaez-Rojas, Alexis Rafael, Guner, Ali, Fayed, Aly, Davis, Amelia L., Vereczkei, Andras, Balla, Andrea, Celotti, Andrea, Romanzi, Andrea, Trombetta, Andrea, Beggs, Andrew D., Robertson, Andrew G., Petrosoniak, Andrew, Davies, Andrew R., Becerra-Bolaños, Ángel, Loria, Anthony, Brillantino, Antonio, Athanasiou, Antonios, Isik, Arda, Ioannidis, Argyrios, Santos, Ariel P., Saha, Arin K., Wijnhoven, Bas P.L., Liu, David S., Naumann, David N., Bhangu, Aneel, Brooks, Adam, Martin, Matthew, Cotton, Bryan A., Khan, Mansoor, Midwinter, Mark J., Pearce, Lyndsay, Bowley, Douglas M., Holcomb, John B., Griffiths, Ewen A., Abu-Abeid, Adam, Peckham-Cooper, Adam, Dyas, Adam R., Adeyeye, Ademola, Dogjani, Agron, Ball, Alasdair C.Y., Wolthuis, Albert M., Quiroga-Garza, Alejandro, Karamarkovic, Aleksandar R., Giordano, Alessio, Fuchs, Alexander, Julianov, Alexander, Phillips, Alexander W., Zimmermann, Alexander, Charalabopoulos, Alexandros, Birkun, Alexei A., Narvaez-Rojas, Alexis Rafael, Guner, Ali, Fayed, Aly, Davis, Amelia L., Vereczkei, Andras, Balla, Andrea, Celotti, Andrea, Romanzi, Andrea, Trombetta, Andrea, Beggs, Andrew D., Robertson, Andrew G., Petrosoniak, Andrew, Davies, Andrew R., Becerra-Bolaños, Ángel, Loria, Anthony, Brillantino, Antonio, Athanasiou, Antonios, Isik, Arda, Ioannidis, Argyrios, Santos, Ariel P., Saha, Arin K., Wijnhoven, Bas P.L., and Liu, David S.
- Abstract
Background: Textbook outcomes are composite outcome measures that reflect the ideal overall experience for patients. There are many of these in the elective surgery literature but no textbook outcomes have been proposed for patients following emergency laparotomy. The aim was to achieve international consensus amongst experts and patients for the best Textbook Outcomes for non-trauma and trauma emergency laparotomy. Methods: A modified Delphi exercise was undertaken with three planned rounds to achieve consensus regarding the best Textbook Outcomes based on the category, number and importance (Likert scale of 1–5) of individual outcome measures. There were separate questions for non-trauma and trauma. A patient engagement exercise was undertaken after round 2 to inform the final round. Results: A total of 337 participants from 53 countries participated in all three rounds of the exercise. The final Textbook Outcomes were divided into ‘early’ and ‘longer-term’. For non-trauma patients the proposed early Textbook Outcome was ‘Discharged from hospital without serious postoperative complications (Clavien–Dindo ≥ grade III; including intra-abdominal sepsis, organ failure, unplanned re-operation or death). For trauma patients it was ‘Discharged from hospital without unexpected transfusion after haemostasis, and no serious postoperative complications (adapted Clavien–Dindo for trauma ≥ grade III; including intra-abdominal sepsis, organ failure, unplanned re-operation on or death)’. The longer-term Textbook Outcome for both non-trauma and trauma was ‘Achieved the early Textbook Outcome, and restoration of baseline quality of life at 1 year’. Conclusion: Early and longer-term Textbook Outcomes have been agreed by an international consensus of experts for non-trauma and trauma emergency laparotomy. These now require clinical validation with patient data.
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- 2024
33. Using a common morphometric-based method to sex a migratory bird along its entire flyway despite geographical and temporal variations in body size and sexual size dimorphism
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Pagnon, Thomas, Etchart, Léa, Teixeira, Maria, Dechaume‑Moncharmont, François-Xavier, Hallgrimsson, Gunnar T., Hansen, Jannik, Lang, Johannes, Moreau, Jérôme, Reneerkens, Jeroen, Schmidt, Niels M., Soloviev, Mikhail, ten Horn, Job, Tomkovich, Pavel, Wood, Andrew G., Yannic, Glenn, Bollache, Loïc, Gilg, Olivier, Pagnon, Thomas, Etchart, Léa, Teixeira, Maria, Dechaume‑Moncharmont, François-Xavier, Hallgrimsson, Gunnar T., Hansen, Jannik, Lang, Johannes, Moreau, Jérôme, Reneerkens, Jeroen, Schmidt, Niels M., Soloviev, Mikhail, ten Horn, Job, Tomkovich, Pavel, Wood, Andrew G., Yannic, Glenn, Bollache, Loïc, and Gilg, Olivier
- Abstract
Sexing bird species with monomorphic plumage is generally challenging, and sexual size dimorphism (SSD) is often used to develop morphometric-based sexing tools, e.g., using discriminant functions. Within species, local selection pressures, age-related and season-related growth may, however, induce geographical and temporal variations in body size and SSD. Such variations may complicate the development of reliable morphometric-based sexing methods at a broad scale. We first investigated body size variations in a migratory shorebird species with wide breeding and wintering ranges, the Sanderling Calidris alba, within the two breeding populations (Greenland and Russia) and three staging/wintering populations (United Kingdom, Iceland and Mauritania), which belong to the same flyway. Then, for samples from each region, we tested whether site-specific (i.e., “regional”) functions performed better than functions developed for birds from the other sites (i.e., “foreign” functions) or than an overall (“flyway”) function that combined all sampled individuals. We found minor variations in SSD between regions, but significant differences in body size between sexes and regions. Females were larger than males and, for instance, breeders had longer wings than staging and wintering birds. Regional functions had similar sexing efficiency as any other functions applied to sample from each region, except for Western Africa where the regional function performed slightly better than some of the other functions. Furthermore, the flyway function developed after merging all subsamples had a similar efficiency than the regional functions, i.e., from 75.4% to 90% of correct sex assignment depending on the region. Given the small or lack of benefit in using regional functions, we conclude that the flyway function can be used reliably to sex Sanderlings measured at different sites, years or seasons within the East Atlantic flyway. Our results may help to develop global sexing function for oth
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- 2024
34. Addressing Empty Space Myopia to Enable Deep Space Travel with Extended Reality Auditory Biofeedback
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Waisberg, Ethan, Ong, Joshua, Zaman, Nasif, Paladugu, Phani, Kamran, Sharif Amit, Markovitz, Bruce, Lee, Andrew G., Tavakkoli, Alireza, Waisberg, Ethan, Ong, Joshua, Zaman, Nasif, Paladugu, Phani, Kamran, Sharif Amit, Markovitz, Bruce, Lee, Andrew G., and Tavakkoli, Alireza
- Abstract
Empty space myopia is a phenomenon that has been observed in pilots when flying in the open sky. Previous research has been conducted to develop training biofeedback devices to help pilot visual accommodation in empty skies. During future long-duration spaceflight, astronauts may also experience empty space myopia due to prolonged periods of time in vast space. Extended reality is a relatively novel technology that has emerged as a powerful tool for tracking ocular movements. Extended reality with auditory feedback may serve as a low-cost, easily applicable method to improve ciliary muscle control and vision during long-duration spaceflight to combat empty space myopia. In this paper, we review the effects of empty field myopia in space and report on the novel development of extended reality with auditory biofeedback as a potential astronaut training tool.
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- 2024
35. A Single Motor Nano Aerial Vehicle with Novel Peer-to-Peer Communication and Sensing Mechanism
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Wang, Jingxian, Curtis, Andrew G., Yim, Mark, Rubenstein, Michael, Wang, Jingxian, Curtis, Andrew G., Yim, Mark, and Rubenstein, Michael
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Communication and position sensing are among the most important capabilities for swarm robots to interact with their peers and perform tasks collaboratively. However, the hardware required to facilitate communication and position sensing is often too complicated, expensive, and bulky to be carried on swarm robots. Here we present Maneuverable Piccolissimo 3 (MP3), a minimalist, single motor drone capable of executing inter-robot communication via infrared light and triangulation-based sensing of relative bearing, distance, and elevation using message arrival time. Thanks to its novel design, MP3 can communicate with peers and localize itself using simple components, keeping its size and mass small and making it inherently safe for human interaction. We present the hardware and software design of MP3 and demonstrate its capability to localize itself, fly stably, and maneuver in the environment using peer-to-peer communication and sensing.
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- 2024
36. PikeLPN: Mitigating Overlooked Inefficiencies of Low-Precision Neural Networks
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Neseem, Marina, McCullough, Conor, Hsin, Randy, Leichner, Chas, Li, Shan, Chong, In Suk, Howard, Andrew G., Lew, Lukasz, Reda, Sherief, Rautio, Ville-Mikko, Moro, Daniele, Neseem, Marina, McCullough, Conor, Hsin, Randy, Leichner, Chas, Li, Shan, Chong, In Suk, Howard, Andrew G., Lew, Lukasz, Reda, Sherief, Rautio, Ville-Mikko, and Moro, Daniele
- Abstract
Low-precision quantization is recognized for its efficacy in neural network optimization. Our analysis reveals that non-quantized elementwise operations which are prevalent in layers such as parameterized activation functions, batch normalization, and quantization scaling dominate the inference cost of low-precision models. These non-quantized elementwise operations are commonly overlooked in SOTA efficiency metrics such as Arithmetic Computation Effort (ACE). In this paper, we propose ACEv2 - an extended version of ACE which offers a better alignment with the inference cost of quantized models and their energy consumption on ML hardware. Moreover, we introduce PikeLPN, a model that addresses these efficiency issues by applying quantization to both elementwise operations and multiply-accumulate operations. In particular, we present a novel quantization technique for batch normalization layers named QuantNorm which allows for quantizing the batch normalization parameters without compromising the model performance. Additionally, we propose applying Double Quantization where the quantization scaling parameters are quantized. Furthermore, we recognize and resolve the issue of distribution mismatch in Separable Convolution layers by introducing Distribution-Heterogeneous Quantization which enables quantizing them to low-precision. PikeLPN achieves Pareto-optimality in efficiency-accuracy trade-off with up to 3X efficiency improvement compared to SOTA low-precision models., Comment: Accepted in CVPR 2024. 10 Figures, 9 Tables
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- 2024
37. Continuous Sculpting: Persistent Swarm Shape Formation Adaptable to Local Environmental Changes
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Curtis, Andrew G., Yim, Mark, Rubenstein, Michael, Curtis, Andrew G., Yim, Mark, and Rubenstein, Michael
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Despite their growing popularity, swarms of robots remain limited by the operating time of each individual. We present algorithms which allow a human to sculpt a swarm of robots into a shape that persists in space perpetually, independent of onboard energy constraints such as batteries. Robots generate a path through a shape such that robots cycle in and out of the shape. Robots inside the shape react to human initiated changes and adapt the path through the shape accordingly. Robots outside the shape recharge and return to the shape so that the shape can persist indefinitely. The presented algorithms communicate shape changes throughout the swarm using message passing and robot motion. These algorithms enable the swarm to persist through any arbitrary changes to the shape. We describe these algorithms in detail and present their performance in simulation and on a swarm of mobile robots. The result is a swarm behavior more suitable for extended duration, dynamic shape-based tasks in applications such as agriculture and emergency response., Comment: 20 pages, 17 figures
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- 2024
38. Detecting Anti-Semitic Hate Speech using Transformer-based Large Language Models
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Liu, Dengyi, Wang, Minghao, Catlin, Andrew G., Liu, Dengyi, Wang, Minghao, and Catlin, Andrew G.
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Academic researchers and social media entities grappling with the identification of hate speech face significant challenges, primarily due to the vast scale of data and the dynamic nature of hate speech. Given the ethical and practical limitations of large predictive models like ChatGPT in directly addressing such sensitive issues, our research has explored alternative advanced transformer-based and generative AI technologies since 2019. Specifically, we developed a new data labeling technique and established a proof of concept targeting anti-Semitic hate speech, utilizing a variety of transformer models such as BERT (arXiv:1810.04805), DistillBERT (arXiv:1910.01108), RoBERTa (arXiv:1907.11692), and LLaMA-2 (arXiv:2307.09288), complemented by the LoRA fine-tuning approach (arXiv:2106.09685). This paper delineates and evaluates the comparative efficacy of these cutting-edge methods in tackling the intricacies of hate speech detection, highlighting the need for responsible and carefully managed AI applications within sensitive contexts.
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- 2024
39. Applications of the Pauson-Khand reaction in the synthesis of tricyclic sesquiterpene natural products
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Malcolm, Andrew G.
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547 - Abstract
Within our laboratory, the syntheses of several related tricyclic sesquiterpene natural products have been completed, and, in all cases, the synthetic route employed the Pauson-Khand reaction (PKR) to generate the complex tricyclic core of each target. To further extend our studies within this area, we embarked upon synthesis of the[5,6,6]-fused tricyclic natural product α-duprezianene. Two main synthetic strategies towards construction of this complex and challenging target molecule have been investigated, and are described within. The first of these strategies focussed on direct formation of the central [5,6,6]-fused skeleton structure in a rapid and efficient fashion through the PKR. Initial synthetic endeavour thus focussed on the generation of suitable enyne intermediates to allow investigation of this key PKR. Towards this aim, a series of novel routes were proposed and investigated, ultimately delivering the requisite enyne intermediates. Regrettably, PKR of these enynes was unsuccessful and an alternative approach towards the target molecule was thus required. The second strategy towards formation of α-duprezianene involved initial construction of the related natural target sesquithuriferone. Indeed, formation of this target would provide a formal route to not only α-duprezianene, but also to a series of related sesquiterpene products. Once again, the PKR was employed in attempts to generate the [5,6,5]-fused tricyclic core of this target. In this regard, following investigation of several potential synthetic pathways, a robust and high yielding route was developed providing a formal total synthesis of sesquithuriferone. Key to this strategy was an extremely efficient PKR which furnished the [5,6,5]-skeletal core of sesquithuriferone in rapid fashion. In establishing this route, the original target α-duprezianene was also accessed in a formal manner. The success of this work serves to further reinforce the utility of the PKR within organic synthesis.
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- 2016
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40. On the plasticity of human mating strategies : experimental evidence for mating strategy change in response to evolutionarily relevant stimuli
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Thomas, Andrew G. and Stewart-Williams, S.
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155.3 - Abstract
Evolutionary psychological theory explains the large variance found in humanmating behaviour through the use of a mating strategies perspective. Specifically, both sexes have short-term and long-term mating strategies containing sets of evolved psychological adaptations which guide mating effort. Individuals vary in their mating behaviour due to the differential activation of these two strategies which are thought to be activated conditionally. That is, an individual is hypothesized to engage in a short- term mating strategy over a long-term one in circumstances where, ancestrally, a short- term strategy would have led to the best fitness outcome. Despite a large body of evidence for the existence of mating strategies in humans, evidence for the ability to conditionally switch between strategies is less robust. To date, such evidence is either in the form of correlational studies, or experimental studies which demonstrate changes to behaviours only partly related to mating strategies. The aim of this thesis was to fill the gap in this literature by demonstrating that participants can change their mating strategies in response to evolutionarily relevant stimuli. A novel measure of mating strategies was developed in order to capture a participants’ propensity towards short- and long-term mating before and after exposure to cues hypothesized to have affected the effectiveness of the two mating strategies in the ancestral environment. These included cues related to a skewed local sex-ratio, self-perceived dominance, and environmental danger. Of the ten experimental hypotheses tested, support (or partial support) was found for seven and the experimental effects were typically small-to-medium in size. Thus, moderate support was found that humans are flexible in their mating strategy implementation and respond to evolutionarily relevant cues, although it was concluded that marked changes in an individual’s environment would be required for any lasting effect on their matingbehaviour to occur.
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- 2015
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41. Mechanistic insights into the stabilisation of biopharmaceuticals using glycine derivatives : the effect of glycine derivatives on the crystallisation, physical properties and behaviour of commonly used excipients to stabilise antigens, adjuvants and proteins in the solid state
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Bright, Andrew G.
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615.1 ,Freeze drying ,Glycine derivatives ,Differential scanning calorimetry (DSC) ,Powder X-Ray diffraction (P-XRD) ,Raman spectroscopy ,Crystallisation ,Water loss ,Vaccines ,Adjuvant ,Stabilisation ,Amorphous ,Gordon-Taylor equation ,Solubility parameters ,Karl Fischer ,Excipients ,Proteins ,DLS (Dynamic Light Scattering) ,Polymorphs ,Vaccines ,Formulation ,Mannitol ,Sucrose ,Biopharmaceuticals - Abstract
This dissertation has focused on studying the effect of four glycine derivatives on the solid state properties of mannitol, glycine, and sucrose when freeze dried into blended mixtures. The primary goal was to assess their value for use in the stabilisation of vaccines in the solid state, by examining key physical and chemical characteristics, which have been documented to be beneficial to the stabilisation of biopharmaceutical formulations. The novel excipients; dimethyl glycine, and trimethyl glycine, were shown to retard the crystallisation and increase the overall glass transition temperature, of mannitol, when freeze dried as evidenced by DSC and Powder X-ray diffraction. Mannitol’s glass transition temperature increased from 100C to 12.650C and 13.610C when mixed with methyl-glycine and dimethyl glycine respectively. The glycine derivatives did not show the same effect on sucrose which remained amorphous regardless of the concentration of the other excipient. The different behaviour with the sucrose system was thought to be due to relatively high glass transition temperature of sucrose. Conversely glycine remained highly crystalline due it’s relatively low glass transition temperature. The novel excipient formulations were also assessed for their effect on the aggregation of the adjuvant aluminium hydroxide when freeze dried by Dynamic Light Scattering (DLS).The formulations containing the glycine derivatives all caused a decrease in the aggregation size of the adjuvant from ~26 μm, to 185 nm in the presence of methyl glycine. The effects of lysozyme and viral antigen on the adjuvants were also examined showing that the addition of the virus did not affect the size of the aggregates formed, however lysozyme showed significant decreases in the aggregates formed. Examination of the freezing method were also made showing that faster freezing rates produced smaller aggregates of the adjuvant. When investigating the rate at which the excipients lost water during secondary drying there was evidence of the formation of hydrates of glycine, trimethyl glycine, and mannitol has shown that the glycine derivatives have attributes which would be beneficial in stabilising vaccines in the solid state when freeze dried.
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- 2015
42. Foraging fish as zoogeomorphic agents : their effects on the structure and composition of gravel-bed river sediments with implications for bed material transport
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Pledger, Andrew G.
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597 ,Biogeomorphology ,Zoogeomorphology ,Ecosystem engineering ,Barbel Barbus barbus ,Gravel-bed river ,Bedload transport ,Imbrication ,Laser scanner - Abstract
The plants and animals that inhabit river channels may act as zoogeomorphic agents affecting the nature and rates of sediment recruitment, transport and deposition. The impact of benthic-feeding fish, which disturb bed material sediments during their search for food, has received little attention, even though benthic feeding species are widespread in rivers and may collectively expend significant amounts of energy foraging across the bed. A series of experiments were conducted to investigate the impacts of benthic feeding fish on the structure and composition of gravel-bed river sediments, and the implications for bed material transport. An ex-situ experiment was conducted to investigate the impact of a benthic feeding fish (European Barbel Barbus barbus) on particle displacements, bed sediment structures, gravel entrainment and transport fluxes. In a laboratory flume, changes in bed surface topography were measured and grain displacements examined when an imbricated, water-worked bed of 5.6-16 mm gravels was exposed to feeding juvenile Barbel. For substrates that had been exposed to feeding fish and control substrates which had not, grain entrainment rates and bedload fluxes were measured under a moderate transport regime. On average, approximately 37% of the substrate, by area, was modified by foraging fish during a four-hour treatment period, resulting in increased microtopographic roughness and reduced particle imbrication. Structural changes caused by fish increased bed load flux by 60% under entrainment flows, whilst on average the total number of grains transported during the entrainment phase was 82% higher from substrates that had been disturbed by Barbel. An ex-situ experiment utilising Barbel and Chub Leuciscus cephalus extended this initial study by considering the role of fish size and species as controls of sediment disturbance by foraging. Increasing the size of Barbel had a significant effect on measured disturbance and bedload transport. Specifically, the area of disturbed substrate, foraging depth, microtopographic roughness and sediment structure all increased as functions of fish size, as did bedload flux and total transported mass. In a comparison of the foraging effects of like-sized Barbel and Chub 8-10 in length, Barbel foraged a larger area of the riverbed and had a greater impact on microtopographic roughness and sediment structure. Foraging by both species was associated with increased sediment transport, but the bed load flux after foraging by Barbel was 150% higher than that following foraging by Chub and the total transported mass of sediment was 98% greater. An in-situ experiment quantified the effects of foraging fish, primarily Cyprinids (specifically Barbel and Chub), on gravel-river bed sediment structures, surface grain-size distributions, sediment transport fluxes and grain entrainment in the River Idle, Nottinghamshire, UK. This was achieved by installing large experimental sediment trays seeded with food at typical densities. The experiments yielded data about 1) topographic and structural differences between pre- and post-feeding substrates using DEMs interpolated from laser scans, 2) modifications to surface and sub-surface grain-size distributions as a function of fish foraging and 3) differences in sediment entrainment from water-worked substrates exposed to feeding fish and control substrates, without fish. Small sections of the substrate trays were recovered in tact from the field and for substrates that had been exposed to feeding fish and control substrates which had not, grain entrainment rates and bedload fluxes were measured under a moderate transport regime in the laboratory. On average, approximately 74% of the substrate, by area, was modified by foraging fish during a twelve-hour period, resulting in increased microtopographic roughness and substrate coarsening which had significant implications for bed material transport during the steady entrainment flow. Together, results from these experiments indicate that by increasing surface microtopography, modifying the composition of fluvial substrates and undoing the naturally stable structures produced by water working, foraging can influence sediment transport dynamics, predominately by increasing the mobility of river bed materials. The implication of this result is that by influencing the quantity of available, transportable sediment and entrainment thresholds, benthic feeding may affect sediment transport fluxes in gravel-bed rivers. In addition, three discrete studies were performed alongside the core experiments described above. A quantitative examination of habitat conditions favoured by feeding Barbel was conducted in the River Idle (Nottinghamshire, UK) which served to supplement existing literature pertaining to Barbel ecology, and inform experimental design during the core experiments. Two further studies considered the potential importance of foraging as a zoogeomorphic activity in terms of spatial extent, at a variety of scales, thereby extending core experiments to larger spatial scales in-situ.
- Published
- 2015
43. The Molecular Basis for Zinc Bioavailability.
- Author
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Hall, Andrew G, Hall, Andrew G, King, Janet C, Hall, Andrew G, Hall, Andrew G, and King, Janet C
- Abstract
Zinc is an essential micronutrient, and its deficiency is perhaps the most prevalent and least understood worldwide. Recent advances have expanded the understanding of zinc's unique chemistry and molecular roles in a vast array of critical functions. However, beyond the concept of zinc absorption, few studies have explored the molecular basis of zinc bioavailability that determines the proportion of dietary zinc utilized in zinc-dependent processes in the body. The purpose of this review is to merge the concepts of zinc molecular biology and bioavailability with a focus on the molecular determinants of zinc luminal availability, absorption, transport, and utilization.
- Published
- 2023
44. The impact of medical students on work after clinic for neurology preceptors
- Author
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Breithaupt, Andrew G, Breithaupt, Andrew G, Roman, Samantha N, Coe, William H, Salas, Rachel E, Strowd, Roy E, Tanner, Jeremy A, Rao, Karthik T, Gamaldo, Charlene E, Breithaupt, Andrew G, Breithaupt, Andrew G, Roman, Samantha N, Coe, William H, Salas, Rachel E, Strowd, Roy E, Tanner, Jeremy A, Rao, Karthik T, and Gamaldo, Charlene E
- Published
- 2023
45. The Spinal Cord in Diabetic Neuropathy
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Marshall, Andrew G, Marshall, Andrew G, Worthington, Anne, Jolivalt, Corinne G, Marshall, Andrew G, Marshall, Andrew G, Worthington, Anne, and Jolivalt, Corinne G
- Published
- 2023
46. Patient-specific mathematical modelling of the hybrid procedure in the treatment of hypoplastic left heart syndrome
- Author
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Young, Andrew G.
- Subjects
610.28 - Abstract
Hypoplastic Left Heart Syndrome (HLHS) is a rare congenital heart disease characterised by the underdevelopment of the left sided structures of the heart, compromising systemic blood supply. The Hybrid Procedure is a palliative repair that delays cardiopulmonary bypass surgery and allows the opportunity for left ventricular growth and biventricular repair. The ductus arteriosus is stented open via catheter, which allows the right ventricle to supply the systemic circulation. In order to balance the pulmonary-systemic flow ratio, branch pulmonary arterial bands are surgically placed. Currently, banding (and stent) dimensions are based on surgical experience, intuition and limited Doppler measurements. In mathematically modelling the Hybrid Procedure, it is possible to optimise the dimensions based on haemodynamic and ventricular data. These simulated results are often difficult and invasive to measure clinically. Due to the broad spectrum of abnormalities observed in HLHS, creating patient-specific models is an area for development. Therefore a thorough investigation of routinely collected clinical data was undertaken, assessing the potential collaboration between biomedical engineering and clinical protocols. A lumped circulation model of the post-Hybrid circulation was produced and clinically validated following novel investigation. An external band diameter of 3 mm was optimal, with 3.5 mm appropriate for larger patients. A patient-specific three-dimensional geometry was constructed and virtual surgery performed for a range of band diameters for steady state analysis. Boundary conditions were determined using matching patient-specific and literature data. This model was coupled to the lumped circulation model in a multiscale model. This highlighted the conflict of definition between internal and external diameter band dimensions. It was shown that the 2 mm internal band diameter was optimal. Regarding patient-specificity, it was demonstrated that current clinical practices are not conducive to mathematical modelling with many steps required in the processing of data. The quality of the data is suboptimal and will require multidisciplinary cooperation for future improvement. Due to the incompleteness of the data sets and the inconsistent data collection, full patient-specificity and predictive modelling was not achieved.
- Published
- 2014
- Full Text
- View/download PDF
47. Analysing landslides in the Three Gorges Region (China) using frequently acquired SAR images
- Author
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Singleton, Andrew G.
- Subjects
621.384 ,GB Physical geography ,GE Environmental Sciences ,QE Geology - Abstract
Spaceborne Synthetic Aperture Radar (SAR) sensors obtain regular and frequent radar images from which ground motion can be precisely detected using a variety of different techniques. The ability to remotely measure slope displacements over large regions has many uses and advantages, although the limitations of an increasingly common technique, Differential SAR Interferometry (D-InSAR), must be considered to avoid the misinterpretation of results. Areas of low coherence and the geometrical effects of mountainous terrain in SAR imagery are known to hinder the exploitation of D-InSAR results. A further major limitation for landslide studies is the assumption that variable rates of movement over a given distance cannot exceed a threshold value, dependent upon the SAR image pixel spacing, the radar sensor wavelength and satellite revisit frequency. This study evaluates the use of three SAR image modes from TerraSAR-X and ENVISAT satellites for monitoring slow-moving landslides in the densely vegetated Three Gorges region, China. Low coherence and episodically fast movements are shown to exceed the measureable limit for regular D-InSAR analysis even for the highest resolution, 11-day interferograms. Subsequently, sub-pixel offset time-series techniques applied to corner reflectors and natural targets are developed as a robust method of resolving time-variable displacements. Verifiable offsets are generated with the TerraSAR-X imagery and the precise movement history of landslides is obtained over a period of up to four years. The capability to derive two-dimensional movements from sub-pixel offsets is used to infer a rotational failure mechanism for the most active landslide detected, and a greater understanding of the landslide behaviour is achieved through comparisons with likely triggering factors and 2D limit equilibrium slope stability analysis.
- Published
- 2014
48. A fibre-based single-photon source
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Riley-Watson, Andrew G.
- Subjects
500 ,QC0350 Optics. Light - Abstract
The controlled emission and absorption of single photons is an important enabling technology in the fields of quantum communication, cryptography and computing. We have realised a novel single photon source, based on a miniature ‘endcap' ion trap with integrated optical fibres. To minimise distortion of the trapping field the fibres are tightly integrated and recessed within the two hollow cylindrical rf electrodes of the trap. This allows us to bring the fibres to within approximately 300 μm of the trapped ion. With the fibres in place we are able to collect the ion's fluorescence using no further optics. In this thesis the ion trap is fully characterised, and the quantum nature of the light demonstrated in the results of a variant on the Hanbury Brown-Twiss photon-correlation experiment. The scheme will ultimately be extended to implement a coherent ion-photon interface through strong coupling cavity-QED. Towards this end, an ultra-high-finesse cavity has been designed and fabricated by laser-machining and coating surfaces with a range of radii of curvature on the end facets of the fibres. To improve the stability and precision manipulation of the cavity in-vacuum, an entirely new trap has been designed and built. Finally, the current status of the fibre cavity and the outlook for the experiment are presented.
- Published
- 2013
49. Design and synthesis of small molecule probes for metabolic processes
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Cairns, Andrew G.
- Subjects
571.6 ,QD Chemistry - Abstract
Synthesis of a photoactivated uncoupler I was completed and subsequently used by collaborators to demonstrate mitochondria uptake. The synthesis of a ratiometric, targetable calcium sensor was completed up to intermediate II (9 steps), alongside a thiohydantoin heterocycle III synthesised in 5 steps. A co-worker has subsequently completed the probe synthesis based on this route, with the resulting probe showing good binding and optical responses in testing. Numerous routes to 5,6-disubstituted phenanthridinium salts were investigated towards the synthesis of a mitochondrially targeted superoxide probe and hydroxylated standards. In the course of this work a novel cyclisation was developed based on intramolecular SNAr giving access to 9-benzyloxyphenanthridinium salt V. Rapid and high-yielding access to 5,6-disubstituted phenanthridinium salts IX was then achieved through forming benzophenones VIII via Suzuki coupling and converting these to imines with the alkylamine. The nitrogen atom of the imine then undergoes cyclisation onto the aryl fluoride in an intramolecular SNAr upon heating. This transformation was shown to have good steric and electronic tolerance in the synthesis of 13 phenanthridinium analogues with 6 structural diversification points. Subsequent DFT calculations by a colleague showed this reaction proceeds in a concerted fashion and as such represents a considerable mechanistic novelty. Efforts towards a new probe for mitochondrial superoxide led to the synthesis of 3-tertbutyl-dihydrophenanthridine X, which does not intercalate into DNA upon oxidation. This concept was refined and lead to the development of neopentyl ethidium XI and the targeted analogue MitoBNH XII and its deuterated analogue XIII.
- Published
- 2013
50. The molecular and clinical implications of human papillomavirus-16 mediated oropharyngeal squamous cell carcinoma
- Author
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Schache, Andrew G., Liloglou, Triantafillos, Risk, Janet M., and Shaw, Richard J.
- Subjects
616.99 ,RC0254 Neoplasms. Tumors. Oncology (including Cancer) - Abstract
The last three decades have seen a fundamental change in the profile of oropharyngeal squamous cell carcinoma (OPSCC) within the developed world. The incidence of OPSCC attributable to tobacco and alcohol exposure has been gradually declining whilst Human papillomavirus (HPV)-related OPSCC has seen a rapid increase. Detection of High Risk HPV has profound prognostic significance as it correlates with both a disease-specific and an overall survival advantage. The stringency of testing, both in terms of diagnostic and prognostic capacity is therefore of increasing importance. This study sought to define the relative abilities of the diagnostic tests presently available in clinical practice and to explore the potential of a novel test in reaching the improved stringency called for by the clinical community. Diagnostic biomarkers with prognostic capacity, such as those utilised in defining HPV status in this research have been well described, however, despite HPV positive OPSCC being biologically distinct from HPV negative malignancy, predictive biomarkers defining the transition from persistent to transforming infection are yet to be forthcoming. A lack of an apparent premalignant state, akin to that seen in HPV-mediated cervical malignancy has restricted biomarker recognition. This research aimed to better define the epigenetic state and clarify the impact of viral integration for the virus and host in HPV positive OPSCC. Although detectable epigenetic alterations, within the genome of the virus and that of the host, were capable of providing an improved description of this burgeoning disease state, they fell short of providing clinically relevant biomarkers. It was however demonstrated that the previously held concept of preferential E2 cleavage during viral integration as a means to disrupt gene expression, is overstated and the model persists to the exclusion of other viral and host genome disruptions. A paradigm shift may be necessary in HPV positive OPSCC to an understanding of obligatory viral integration, the significance of which however, is yet to be fully elucidated.
- Published
- 2013
- Full Text
- View/download PDF
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