86 results on '"Andrea Ludwig"'
Search Results
2. CHF6523 data suggest that the phosphoinositide 3-kinase delta isoform is not a suitable target for the management of COPD
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Mirco Govoni, Michele Bassi, Luca Girardello, Germano Lucci, François Rony, Rémi Charretier, Dmitry Galkin, Maria Laura Faietti, Barbara Pioselli, Gloria Modafferi, Rui Benfeitas, Martina Bonatti, Daniela Miglietta, Jonathan Clark, Frauke Pedersen, Anne-Marie Kirsten, Kai-Michael Beeh, Oliver Kornmann, Stephanie Korn, Andrea Ludwig-Sengpiel, and Henrik Watz
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Phosphatidylinositol 3-kinases ,Therapeutics ,Proteomics ,Gene expression profiling ,Multi-omics ,Diseases of the respiratory system ,RC705-779 - Abstract
Abstract Background Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory condition. Given patients with COPD continue to experience exacerbations despite the availability of effective therapies, anti-inflammatory treatments targeting novel pathways are needed. Kinases, notably the phosphoinositide 3-kinases (PI3K), are thought to be involved in chronic airway inflammation, with this pathway proposed as a critical regulator of inflammation and oxidative stress response in COPD. CHF6523 is an inhaled PI3Kδ inhibitor that has shown positive preclinical results. This manuscript reports the results of a study of CHF6523 in patients with stable COPD (chronic bronchitis phenotype), and who had evidence of type-2 inflammation. Methods This randomised, double-blind, placebo-controlled, two-way crossover study comprised two 28-day treatment periods separated by a 28-day washout. Patients (N = 44) inhaled CHF6523 in one period, and placebo in the other, both twice daily. The primary objective was to assess the safety and tolerability of CHF6523; the secondary objective was to assess CHF6523 pharmacokinetics. Exploratory endpoints included target engagement (the relative reduction in phosphatidylinositol (3,4,5)-trisphosphate [PIP3]), pharmacodynamic evaluations such as airflow obstruction, and hyperinflation, and to identify biomarker(s) of drug response using proteomics and transcriptomics. Results CHF6523 plasma pharmacokinetics were characterised by an early maximum concentration (Cmax), reached 15 and 10 min after dosing on Days 1 and 28, respectively, followed by a rapid decline. Systemic exposure on Day 28 showed limited accumulation, with ratios
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- 2024
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3. Baseline characteristics from a 3-year longitudinal study to phenotype subjects with COPD: the FOOTPRINTS study
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James D. Crapo, Abhya Gupta, David A. Lynch, Alice M. Turner, Robert M. Mroz, Wim Janssens, Andrea Ludwig-Sengpiel, Harald Koegler, Anastasia Eleftheraki, Frank Risse, and Claudia Diefenbach
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Chronic obstructive pulmonary disease ,Emphysema ,FOOTPRINTS® ,Baseline characteristics ,Alpha 1 antitrypsin deficiency ,Biomarkers ,Diseases of the respiratory system ,RC705-779 - Abstract
Abstract Background FOOTPRINTS® is a prospective, longitudinal, 3-year study assessing the association between biomarkers of inflammation/lung tissue destruction and chronic obstructive pulmonary disease (COPD) severity and progression in ex-smokers with mild-to-severe COPD. Here, we present baseline characteristics and select biomarkers of study subjects. Methods The methodology of FOOTPRINTS® has been published previously. The study population included ex-smokers with a range of COPD severities (Global Initiative for Chronic Obstructive Lung Disease [GOLD] stages 1–3), ex-smokers with COPD and alpha-1-antitrypsin deficiency (A1ATD) and a control group of ex-smokers without airflow limitation (EwAL). At study entry, data were collected for: demographics, disease characteristics, history of comorbidities and COPD exacerbations, symptoms, lung function and volume, exercise capacity, soluble biomarkers, and quantitative and qualitative computed tomography. Baseline data are presented with descriptive statistical comparisons for soluble biomarkers in the individual GOLD and A1ATD groups versus EwAL. Results In total, 463 subjects were enrolled. The per-protocol set comprised 456 subjects, mostly male (64.5%). The mean (standard deviation) age was 60.7 (6.9) years. At baseline, increasing pulmonary symptoms, worse lung function, increased residual volume, reduced diffusing capacity of the lung for carbon monoxide (DLco) and greater prevalence of centrilobular emphysema were observed with increasing disease severity amongst GOLD 1–3 subjects. Subjects with A1ATD (n = 19) had similar lung function parameters to GOLD 2–3 subjects, a high residual volume comparable to GOLD 3 subjects, and similar air trapping to GOLD 2 subjects. Compared with EwAL (n = 61), subjects with A1ATD had worse lung function, increased residual volume, reduced DLco, and a greater prevalence of confluent or advanced destructive emphysema. The soluble inflammatory biomarkers white blood cell count, fibrinogen, high-sensitivity C-reactive protein and plasma surfactant protein were higher in GOLD 1–3 groups than in the EwAL group. Interleukin-6 was expressed less often in EwAL subjects compared with subjects in the GOLD and A1ATD groups. Soluble receptor for advanced glycation end product was lowest in GOLD 3 subjects, indicative of more severe emphysema. Conclusions These findings provide context for upcoming results from FOOTPRINTS®, which aims to establish correlations between biomarkers and disease progression in a representative COPD population. Trial registration number: NCT02719184, study start date 13/04/2016.
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- 2023
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4. Nutrient composition (Si:N) as driver of plankton communities during artificial upwelling
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Silvan Urs Goldenberg, Jan Taucher, Mar Fernández-Méndez, Andrea Ludwig, Javier Arístegui, Moritz Baumann, Joaquin Ortiz, Annegret Stuhr, and Ulf Riebesell
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ocean fertilization ,diatoms ,stoichiometry ,silicic acid ,ecosystem-based aquaculture ,negative emission technology ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Artificial upwelling brings nutrient-rich deep water to the sun-lit surface to boost fisheries or carbon sequestration. Deep water sources under consideration range widely in inorganic silicon (Si) relative to nitrogen (N). Yet, little is known about how such differences in nutrient composition may influence the effectiveness of the fertilization. Si is essential primarily for diatoms that may increase food web and export efficiency via their large size and ballasting mineral shells, respectively. With a month-long mesocosm study in the subtropical North Atlantic, we tested the biological response to artificial upwelling with varying Si:N ratios (0.07-1.33). Community biomass increased 10-fold across all mesocosms, indicating that basic bloom dynamics were upheld despite the wide range in nutrient composition. Key properties of these blooms, however, were influenced by Si. Photosynthetic capacity and nutrient-use efficiency doubled from Si-poor to Si-rich upwelling, leading to C:N ratios as high as 17, well beyond Redfield. Si-rich upwelling also resulted in 6-fold higher diatom abundance and mineralized Si and a corresponding shift from smaller towards larger phytoplankton. The pronounced change in both plankton quantity (biomass) and quality (C:N ratio, size and mineral ballast) for trophic transfer and export underlines the pivotal role of Si in shaping the response of oligotrophic regions to upwelled nutrients. Our findings indicate a benefit of active Si management during artificial upwelling with the potential to optimize fisheries production and CO2 removal.
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- 2022
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5. Response of plankton community respiration under variable simulated upwelling events
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Isabel Baños, Javier Arístegui, Mar Benavides, Markel Gómez-Letona, María F. Montero, Joaquín Ortiz, Kai G. Schulz, Andrea Ludwig, and Ulf Riebesell
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nutrient availability ,artificial upwelling ,carbon export ,EBUS ,mesocosm ,climate change ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Climate change is expected to alter the intensity and frequency of upwelling in high productive coastal regions, thus impacting nutrient fluxes, primary productivity and consequently carbon cycling. However, it is unknown how these changes will impact the planktonic (phytoplankton and bacteria) community structure, which affects community respiration (CR) and hence the carbon available for sequestration or transfer to upper trophic levels. Here we present results from a 37-day mesocosm experiment where we examined the response of CR to nutrient additions by simulating upwelling events at different intensities (low, medium, high and extreme) and modes (singular and recurring additions). We also analysed the potential contribution of different plankton size classes and functional groups to CR. The trend in accumulated CR with respect to nutrient fertilisation (total nitrogen added during the experiment) was linear in the two modes. Microplankton (mostly diatoms) and nanoplankton (small flagellates) dominated under extreme upwelling intensities and high CR in both singular and recurring upwelling modes, explaining >65% of the observed variability in CR. In contrast, prokaryotic picoplankton (heterotrophic bacteria and autotrophic cyanobacteria) explained
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- 2022
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6. FOOTPRINTS study protocol: rationale and methodology of a 3-year longitudinal observational study to phenotype patients with COPD
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Claudia Diefenbach, Henrik Watz, Wim Janssens, David A Lynch, Jens Vogel-Claussen, Alice M Turner, James Crapo, Abhya Gupta, Robert M Mroz, Andrea Ludwig-Sengpiel, Markus Beck, Bérengère Langellier, Carina Ittrich, and Frank Risse
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Medicine - Abstract
Introduction A better understanding is needed of the different phenotypes that exist for patients with chronic obstructive pulmonary disease (COPD), their relationship with the pathogenesis of COPD and how they may affect disease progression. Biomarkers, including those associated with emphysema, may assist in characterising patients and in predicting and monitoring the course of disease. The FOOTPRINTS study (study 352.2069) aims to identify biomarkers associated with emphysema, over a 3-year period.Methods and analysis The FOOTPRINTS study is a prospective, longitudinal, multinational (12 countries), multicentre (51 sites) biomarker study, which has enrolled a total of 463 ex-smokers, including subjects without airflow limitation (as defined by the 2015 Global Initiative for Chronic Obstructive Lung Disease (GOLD) strategy report), patients with COPD across the GOLD stages 1–3 and patients with COPD and alpha1-antitrypsin deficiency. The study has an observational period lasting 156 weeks that includes seven site visits and additional phone interviews. Biomarkers in blood and sputum, imaging data (CT and magnetic resonance), clinical parameters, medical events of special interest and safety are being assessed at regular visits. Disease progression based on biomarker values and COPD phenotypes are being assessed using multivariate statistical prediction models.Ethics and dissemination The study protocol was approved by the authorities and ethics committees/institutional review boards of the respective institutions where applicable, which included study sites in Belgium, Canada, Denmark, Finland, Germany, Japan, Korea, Poland, Spain, Sweden, UK and USA; written informed consent has been obtained from all study participants. Ethics committee approval was obtained for all participating sites prior to enrolment of the study participants. The study results will be reported in peer-reviewed publications.Trial registration number NCT02719184.
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- 2021
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7. Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem: A Mesocosm Study
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Carsten Spisla, Jan Taucher, Lennart T. Bach, Mathias Haunost, Tim Boxhammer, Andrew L. King, Bettany D. Jenkins, Joselynn R. Wallace, Andrea Ludwig, Jana Meyer, Paul Stange, Fabrizio Minutolo, Kai T. Lohbeck, Alice Nauendorf, Verena Kalter, Silke Lischka, Michael Sswat, Isabel Dörner, Stefanie M. H. Ismar-Rebitz, Nicole Aberle, Jaw C. Yong, Jean-Marie Bouquet, Anna K. Lechtenbörger, Peter Kohnert, Michael Krudewig, and Ulf Riebesell
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climate change ,ocean acidification ,plankton ecology ,biogeochemistry ,coastal ecosystem ,mesocosm ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
The oceans’ uptake of anthropogenic carbon dioxide (CO2) decreases seawater pH and alters the inorganic carbon speciation – summarized in the term ocean acidification (OA). Already today, coastal regions experience episodic pH events during which surface layer pH drops below values projected for the surface ocean at the end of the century. Future OA is expected to further enhance the intensity of these coastal extreme pH events. To evaluate the influence of such episodic OA events in coastal regions, we deployed eight pelagic mesocosms for 53 days in Raunefjord, Norway, and enclosed 56–61 m3 of local seawater containing a natural plankton community under nutrient limited post-bloom conditions. Four mesocosms were enriched with CO2 to simulate extreme pCO2 levels of 1978 – 2069 μatm while the other four served as untreated controls. Here, we present results from multivariate analyses on OA-induced changes in the phyto-, micro-, and mesozooplankton community structure. Pronounced differences in the plankton community emerged early in the experiment, and were amplified by enhanced top-down control throughout the study period. The plankton groups responding most profoundly to high CO2 conditions were cyanobacteria (negative), chlorophyceae (negative), auto- and heterotrophic microzooplankton (negative), and a variety of mesozooplanktonic taxa, including copepoda (mixed), appendicularia (positive), hydrozoa (positive), fish larvae (positive), and gastropoda (negative). The restructuring of the community coincided with significant changes in the concentration and elemental stoichiometry of particulate organic matter. Results imply that extreme CO2 events can lead to a substantial reorganization of the planktonic food web, affecting multiple trophic levels from phytoplankton to primary and secondary consumers.
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- 2021
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8. Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels
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Mayte Tames-Espinosa, Ico Martínez, Vanesa Romero-Kutzner, Josep Coca, María Algueró-Muñiz, Henriette G. Horn, Andrea Ludwig, Jan Taucher, Lennart Bach, Ulf Riebesell, Theodore T. Packard, and May Gómez
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ocean acidification ,mesocosms ,nutrient fertilization ,subtropical North-Atlantic ,potential respiration ,plankton metabolism ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
In the autumn of 2014, nine large mesocosms were deployed in the oligotrophic subtropical North-Atlantic coastal waters off Gran Canaria (Spain). Their deployment was designed to address the acidification effects of CO2 levels from 400 to 1,400 μatm, on a plankton community experiencing upwelling of nutrient-rich deep water. Among other parameters, chlorophyll a (chl-a), potential respiration (Φ), and biomass in terms of particulate protein (B) were measured in the microplankton community (0.7–50.0 μm) during an oligotrophic phase (Phase I), a phytoplankton-bloom phase (Phase II), and a post-bloom phase (Phase III). Here, we explore the use of the Φ/chl-a ratio in monitoring shifts in the microplankton community composition and its metabolism. Φ/chl-a values below 2.5 μL O2 h−1 (μg chl-a)−1 indicated a community dominated by photoautotrophs. When Φ/chl-a ranged higher, between 2.5 and 7.0 μL O2 h−1 (μg chl-a)−1, it indicated a mixed community of phytoplankton, microzooplankton and heterotrophic prokaryotes. When Φ/chl-a rose above 7.0 μL O2 h−1 (μg chl-a)−1, it indicated a community where microzooplankton proliferated (>10.0 μL O2 h−1 (μg chl-a)−1), because heterotrophic dinoflagellates bloomed. The first derivative of B, as a function of time (dB/dt), indicates the rate of protein build-up when positive and the rate of protein loss, when negative. It revealed that the maximum increase in particulate protein (biomass) occurred between 1 and 2 days before the chl-a peak. A day after this peak, the trough revealed the maximum net biomass loss. This analysis did not detect significant changes in particulate protein, neither in Phase I nor in Phase III. Integral analysis of Φ, chl-a and B, over the duration of each phase, for each mesocosm, reflected a positive relationship between Φ and pCO2 during Phase II [α = 230·10−5 μL O2 h−1 L−1 (μatm CO2)−1 (phase-day)−1, R2 = 0.30] and between chl-a and pCO2 during Phase III [α = 100·10−5 μg chl-a L−1 (μ atmCO2)−1 (phase-day)−1, R2 = 0.84]. At the end of Phase II, a harmful algal species (HAS), Vicicitus globosus, bloomed in the high pCO2 mesocosms. In these mesocosms, microzooplankton did not proliferate, and chl-a retention time in the water column increased. In these V. globosus-disrupted communities, the Φ/chl-a ratio [4.1 ± 1.5 μL O2 h−1 (μg chl-a)−1] was more similar to the Φ/chl-a ratio in a mixed plankton community than to a photoautotroph-dominated one.
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- 2020
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9. Plankton Community Respiration and ETS Activity Under Variable CO2 and Nutrient Fertilization During a Mesocosm Study in the Subtropical North Atlantic
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Alba Filella, Isabel Baños, María F. Montero, Nauzet Hernández-Hernández, Adriana Rodríguez-Santos, Andrea Ludwig, Ulf Riebesell, and Javier Arístegui
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plankton respiration ,ETS activity ,R/ETS ,ocean acidification ,nutrient fertilization ,mesocosm ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
The enzymatic electron transport system (ETS) assay is frequently used as a proxy of respiratory activity in planktonic communities. It is thought to estimate the maximum overall activity of the enzymes associated with the respiratory ETS systems in both eukaryotic and prokaryotic organisms. Thus, in order to derive actual respiration rates (R) from ETS it is necessary to determine empirical R/ETS conversion algorithms. In this study we explore the temporal development of R and ETS activity in natural plankton communities (from bacteria to large phytoplankton) enclosed in mesocosms, treated with different CO2 concentrations. The experiment lasted 30 days, during which abrupt changes in community structure and biomass occurred through a sharp transition from oligotrophy (phase I) to highly eutrophic conditions (phase II) after nutrient-induced fertilization (day 18). R and ETS did not show any response to CO2 under oligotrophic conditions, but R increased significantly more in the two high CO2 mesocosms after fertilization, coinciding with a sharp rise in large phytoplankton (mostly diatoms). R and ETS were significantly correlated only during the eutrophic phase. The R/ETS ranged more than threefold in magnitude during the experiment, with phase-averaged values significantly higher under oligotrophic conditions (0.7–1.1) than after nutrient fertilization (0.5–0.7). We did not find any significant relationship between R/ETS and community structure or biomass, although R correlated significantly with total biomass after fertilization in the four mesocosms. Multiple stepwise regression models show that large phytoplankton explains most of the variance in R during phases I (86%) and II (53%) and of ETS (86%) during phase II, while picophytoplankton contributes up to 73% to explain the variance in the ETS model during phase I. Our results suggest that R/ETS may be too variable in the ocean as to apply constant values to different communities living under contrasting environmental conditions. Controlled experiments with natural communities, like the present one, would help to constrain the range of variability of the R/ETS ratio, and to understand the factors driving it.
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- 2018
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10. Processes That Contribute to Decreased Dimethyl Sulfide Production in Response to Ocean Acidification in Subtropical Waters
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Stephen D. Archer, Kerstin Suffrian, Kevin M. Posman, Lennart T. Bach, Patricia A. Matrai, Peter D. Countway, Andrea Ludwig, and Ulf Riebesell
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DMS ,DMSP ,ocean acidification ,bacterial metabolism ,phytoplankton composition ,subtropical North Atlantic ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Long-term time series data show that ocean acidification is occurring in the subtropical oceans. As a component of an in situ mesocosm experiment carried out off Gran Canaria in the subtropical North Atlantic, we examined the influence of ocean acidification on the net production of dimethylsulfide (DMS). Over 23 days under oligotrophic conditions, time-integrated DMS concentrations showed an inverse relationship of −0.21 ± 0.02 nmol DMS nmol−1 H+ across the gradient of H+ concentration of 8.8–23.3 nmol l−1, equivalent to a range of pCO2 of 400–1,252 atm. Proportionally similar decreases in the concentrations of both dissolved and particulate dimethylsulfoniopropionate (DMSP) were observed in relation to increasing H+ concentration between the mesocosms. The reduced net production of DMSP with increased acidity appeared to result from a decrease in abundance of a DMSP-rich nanophytoplankton population. A 35S-DMSP tracer approach was used to determine rates of dissolved DMSP catabolism, including DMS production, across the mesocosm treatments. Over a phase of increasing DMS concentrations during the experiment, the specific rates of DMS production were significantly reduced at elevated H+ concentration. These rates were closely correlated to the rates of net DMS production indicating that transformation of dissolved DMSP to DMS by bacteria was a major component of DMS production. It was not possible to resolve whether catabolism of DMSP was directly influenced by H+ concentrations or was an indirect response in the bacterial community composition associated with reduced DMSP availability. There is a pressing need to understand how subtropical planktonic communities respond to the predicted gradual prolonged ocean acidification, as alterations in the emission of DMS from the vast subtropical oceans could influence atmospheric chemistry and potentially climate, over a large proportion of the Earth's surface.
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- 2018
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11. High CO2 Under Nutrient Fertilization Increases Primary Production and Biomass in Subtropical Phytoplankton Communities: A Mesocosm Approach
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Nauzet Hernández-Hernández, Lennart T. Bach, María F. Montero, Jan Taucher, Isabel Baños, Wanchun Guan, Mario Espósito, Andrea Ludwig, Eric P. Achterberg, Ulf Riebesell, and Javier Arístegui
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ocean acidification ,nutrient fertilization ,mesocosm ,size-fractionated primary production ,phytoplankton community structure ,subtropical North Atlantic ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
The subtropical oceans are home to one of the largest ecosystems on Earth, contributing to nearly one third of global oceanic primary production. Ocean warming leads to enhanced stratification in the oligotrophic ocean but also intensification in cross-shore wind gradients and thus in eddy kinetic energy across eastern boundary regions of the subtropical gyres. Phytoplankton thriving in a future warmer oligotrophic subtropical ocean with enhanced CO2 levels could therefore be patchily fertilized by increased mesoscale and submesoscale variability inducing nutrient pumping into the surface ocean. Under this premise, we have tested the response of three size classes (0.2–2, 2–20, and >20 μm) of subtropical phytoplankton communities in terms of primary production, chlorophyll and cell biomass, to increasing CO2 concentrations and nutrient fertilization during an in situ mesocosm experiment in oligotrophic waters off of the island of Gran Canaria. We found no significant CO2-related effect on primary production and biomass under oligotrophic conditions (phase I). In contrast, primary production, chlorophyll and biomass displayed a significant and pronounced increase under elevated CO2 conditions in all groups after nutrient fertilization, both during the bloom (phase II) and post-bloom (phase III) conditions. Although the relative increase of primary production in picophytoplankton (250%) was 2.5 higher than in microphytoplankton (100%) after nutrient fertilization, comparing the high and low CO2 treatments, microphytoplankton dominated in terms of biomass, contributing >57% to the total. These results contrast with similar studies conducted in temperate and cold waters, where consistently small phytoplankton benefitted after nutrient additions at high CO2, pointing to different CO2-sensitivities across plankton communities and ecosystem types in the ocean.
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- 2018
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12. Photochemical vs. Bacterial Control of H2O2 Concentration Across a pCO2 Gradient Mesocosm Experiment in the Subtropical North Atlantic
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Mark J. Hopwood, Ulf Riebesell, Javier Arístegui, Andrea Ludwig, Eric P. Achterberg, and Nauzet Hernández
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hydrogen peroxide ,H2O2 ,mesocosm ,Atlantic ,pCO2 ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
In the surface ocean, microorganisms are both a source of extracellular H2O2 and, via the production of H2O2 destroying enzymes, also one of the main H2O2 sinks. Within microbial communities, H2O2 sources and sinks may be unevenly distributed and thus microbial community structure could influence ambient extracellular H2O2 concentrations. Yet the biogeochemical cycling of H2O2 and other reactive oxygen species (ROS) is rarely investigated at the community level. Here, we present a time series of H2O2 concentrations during a 28-day mesocosm experiment where a pCO2 gradient (400–1,450 μatm) was applied to subtropical North Atlantic waters. Pronounced changes in H2O2 concentration were observed over the duration of the experiment. Initially H2O2 concentrations in all mesocosms were strongly correlated with surface H2O2 concentrations in ambient seawaters outside the mesocosms which ranged from 20 to 92 nM over the experiment duration (Spearman Rank Coefficients 0.79–0.93, p-values < 0.001–0.015). After approximately 9 days of incubation however, H2O2 concentrations had increased across all mesocosms, later reaching >300 nM in some mesocosms (2–6 fold higher than ambient seawaters). The correlation with ambient H2O2 was then no longer significant (p > 0.05) in all treatments. Furthermore, changes in H2O2 could not be correlated with inter-day changes in integrated irradiance. Yet H2O2 concentrations in most mesocosms were inversely correlated with bacterial abundance (negative Spearman Rank Coefficients ranging 0.59–0.94, p-values < 0.001–0.03). Our results therefore suggest that ambient H2O2 concentration can be influenced by microbial community structure with shifts toward high bacterial abundance correlated with low extracellular H2O2 concentrations. We also infer that the nature of mesocosm experiment design, i.e., the enclosure of water within open containers at the ocean surface, can strongly influence extracellular H2O2 concentrations. This has potential chemical and biological implications during incubation experiments due to the role of H2O2 as both a stressor to microbial functioning and a reactive component involved in the cycling of numerous chemical species including, for example, trace metals and haloalkanes.
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- 2018
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13. Enhanced transfer of organic matter to higher trophic levels caused by ocean acidification and its implications for export production: A mass balance approach.
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Tim Boxhammer, Jan Taucher, Lennart T Bach, Eric P Achterberg, María Algueró-Muñiz, Jessica Bellworthy, Jan Czerny, Mario Esposito, Mathias Haunost, Dana Hellemann, Andrea Ludwig, Jaw C Yong, Maren Zark, Ulf Riebesell, and Leif G Anderson
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Medicine ,Science - Abstract
Ongoing acidification of the ocean through uptake of anthropogenic CO2 is known to affect marine biota and ecosystems with largely unknown consequences for marine food webs. Changes in food web structure have the potential to alter trophic transfer, partitioning, and biogeochemical cycling of elements in the ocean. Here we investigated the impact of realistic end-of-the-century CO2 concentrations on the development and partitioning of the carbon, nitrogen, phosphorus, and silica pools in a coastal pelagic ecosystem (Gullmar Fjord, Sweden). We covered the entire winter-to-summer plankton succession (100 days) in two sets of five pelagic mesocosms, with one set being CO2 enriched (~760 μatm pCO2) and the other one left at ambient CO2 concentrations. Elemental mass balances were calculated and we highlight important challenges and uncertainties we have faced in the closed mesocosm system. Our key observations under high CO2 were: (1) A significantly amplified transfer of carbon, nitrogen, and phosphorus from primary producers to higher trophic levels, during times of regenerated primary production. (2) A prolonged retention of all three elements in the pelagic food web that significantly reduced nitrogen and phosphorus sedimentation by about 11 and 9%, respectively. (3) A positive trend in carbon fixation (relative to nitrogen) that appeared in the particulate matter pool as well as the downward particle flux. This excess carbon counteracted a potential reduction in carbon sedimentation that could have been expected from patterns of nitrogen and phosphorus fluxes. Our findings highlight the potential for ocean acidification to alter partitioning and cycling of carbon and nutrients in the surface ocean but also show that impacts are temporarily variable and likely depending upon the structure of the plankton food web.
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- 2018
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14. Inhaled Steroids and Active Smoking Drive Chronic Obstructive Pulmonary Disease Symptoms and Biomarkers to a Greater Degree Than Airflow Limitation
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Philip E Silkoff, Dave Singh, J Mark FitzGerald, Andreas Eich, Andrea Ludwig-Sengpiel, Geoffrey C Chupp, Vibeke Backer, Celeste Porsbjerg, Pierre-Olivier Girodet, Mark T Dransfield, Frederic Baribaud, Vedrana S Susulic, and Matthew J Loza
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Medicine (General) ,R5-920 - Abstract
Rationale: Chronic obstructive pulmonary disease (COPD) is a heterogeneous disease, and development of novel therapeutics requires an understanding of pathophysiologic phenotypes. Objectives: The purpose of the Airways Disease Endotyping for Personalized Therapeutics (ADEPT) study was to correlate clinical features and biomarkers with molecular characteristics in a well-profiled COPD cohort. Methods: A total of 67 COPD subjects (forced expiratory volume in the first second of expiration [FEV 1 ]: 45%-80% predicted) and 63 healthy smoking and nonsmoking controls underwent multiple assessments including patient questionnaires, lung function, and clinical biomarkers including fractional exhaled nitric oxide (FENO), induced sputum, and blood. Measurements and main results: The impact of inhaled corticosteroids (ICSs), and to a lesser extent current smoking, was more associated with symptom control, exacerbation rates, and clinical biomarkers, than severity by FEV 1 . The ICS-treated smoking subjects were most symptomatic, with significantly elevated scores on patient-reported outcomes and more annual exacerbations ( P
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- 2017
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15. Influence of Ocean Acidification on a Natural Winter-to-Summer Plankton Succession: First Insights from a Long-Term Mesocosm Study Draw Attention to Periods of Low Nutrient Concentrations.
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Lennart T Bach, Jan Taucher, Tim Boxhammer, Andrea Ludwig, Kristineberg KOSMOS Consortium, Eric P Achterberg, María Algueró-Muñiz, Leif G Anderson, Jessica Bellworthy, Jan Büdenbender, Jan Czerny, Ylva Ericson, Mario Esposito, Matthias Fischer, Mathias Haunost, Dana Hellemann, Henriette G Horn, Thomas Hornick, Jana Meyer, Michael Sswat, Maren Zark, and Ulf Riebesell
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Medicine ,Science - Abstract
Every year, the oceans absorb about 30% of anthropogenic carbon dioxide (CO2) leading to a re-equilibration of the marine carbonate system and decreasing seawater pH. Today, there is increasing awareness that these changes-summarized by the term ocean acidification (OA)-could differentially affect the competitive ability of marine organisms, thereby provoking a restructuring of marine ecosystems and biogeochemical element cycles. In winter 2013, we deployed ten pelagic mesocosms in the Gullmar Fjord at the Swedish west coast in order to study the effect of OA on plankton ecology and biogeochemistry under close to natural conditions. Five of the ten mesocosms were left unperturbed and served as controls (~380 μatm pCO2), whereas the others were enriched with CO2-saturated water to simulate realistic end-of-the-century carbonate chemistry conditions (~760 μatm pCO2). We ran the experiment for 113 days which allowed us to study the influence of high CO2 on an entire winter-to-summer plankton succession and to investigate the potential of some plankton organisms for evolutionary adaptation to OA in their natural environment. This paper is the first in a PLOS collection and provides a detailed overview on the experimental design, important events, and the key complexities of such a "long-term mesocosm" approach. Furthermore, we analyzed whether simulated end-of-the-century carbonate chemistry conditions could lead to a significant restructuring of the plankton community in the course of the succession. At the level of detail analyzed in this overview paper we found that CO2-induced differences in plankton community composition were non-detectable during most of the succession except for a period where a phytoplankton bloom was fueled by remineralized nutrients. These results indicate: (1) Long-term studies with pelagic ecosystems are necessary to uncover OA-sensitive stages of succession. (2) Plankton communities fueled by regenerated nutrients may be more responsive to changing carbonate chemistry than those having access to high inorganic nutrient concentrations and may deserve particular attention in future studies.
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- 2016
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16. Long-term safety and efficacy of tezepelumab in people with severe, uncontrolled asthma (DESTINATION): a randomised, placebo-controlled extension study
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Andrew Menzies-Gow, Michael E Wechsler, Christopher E Brightling, Stephanie Korn, Jonathan Corren, Elliot Israel, Geoffrey Chupp, Artur Bednarczyk, Sandhia Ponnarambil, Scott Caveney, Gun Almqvist, Monika Gołąbek, Linda Simonsson, Kaitlyn Lawson, Karin Bowen, Gene Colice, Jorge Lima Hetzel, Jussara Fiterman, Adelmir Souza Machado, Martti Anton Antila, Marina Andrade Lima, Suzana Erico Tanni Minamoto, Daniela Cavalet Blanco, Patricia Gomes de Matos Bezerra, Pierre-Alain Houle, Catherine Lemiere, Lyle S Melenka, Richard Leigh, Patrick Mitchell, Syed Anees, Bonavuth Pek, Guy Chouinard, Amarjit S Cheema, William Ho-Ching Yang, George Philteos, Pascal Chanez, Arnaud Bourdin, Gilles Devouassoux, Camille Taille, Frédéric De Blay, Christophe Leroyer, Antoine Beurnier, Gilles Garcia, Pierre-Olivier Girodet, François-Xavier Blanc, Antoine Magnan, Stéphanie Wanin, Jocelyne Just, Richard Linde, Stefan Zielen, Karin Förster, Christian Geßner, Margret Jandl, Roland Otto Buhl, Marc Oliver Kornmann, Anneliese Linnhoff, Andrea Ludwig-Sengpiel, Martin Ehlers, Tibor Schmoller, Heiner Steffen, Martin Hoffmann, Joachim Kirschner, Olaf Schmidt, Tobias Welte, Hilke Temme, Ori Wand, Amir Bar-Shai, Gabriel Izbicki, Neville Berkman, Gershon Fink, David Shitrit, Yochai Adir, Piotr Kuna, Barbara Rewerska, Ewa Pisarczyk-Bogacka, Oksana Kurbacheva, Sergey L Mikhailov, Maksim Vasilev, Alexander Emelyanov, Siraj Wali, Amr Albanna, Richard van Zyl-Smit, Ismail Abdullah, David Bernhardi, Farzana Hoosen, Elvis Irusen, Ismail Kalla, Deepak Lakha, Essack Mitha, Visvakuren Naidoo, Haylene Nell, Trevenesan Padayachee, Jeevren Reddy, Friedrich Petrick, Eugene van der Walt, Zubar Fazal Ahmed Vawda, Hae-Sim Park, Sang Haak Lee, Mi-Kyeong Kim, Jung-Won Park, You Sook Cho, Byung Jae Lee, Yoon-Seok Chang, Choon-Sik Park, Kwan Ho Lee, Sook Young Lee, HyoungKyu Yoon, Kyoung Hee Sohn, Myung Jae Park, Kyung Hoon Min, Young Joo Cho, Han Ki Park, YongChul Lee, Jaechun Lee, Chau-Chyun Sheu, Chih-Yen Tu, Kang-Yun Lee, Sevim Bavbek, Bilun Gemicioglu, Dane Ediger, Ilkay Koca Kalkan, Nataliia Makieieva, Mykola Ostrovskyy, Yevgeniya Dytyatkovs'ka, Yuriy Mykhaylovych Mostovoy, Kyrylo Lebed, Oleh Yakovenko, Atoya Adams, Timothy Mooring, Louis Torres Jr, Marvin Sexton, Ernest Thompson, Jonathan A Bernstein, Paul Lisi, Christopher M Chappel, Jeremy Cole, Gary I Greenwald, Conigliaro Jones, Ryan Mitchell Klein, David N Pham, Selwyn Spangenthal, Steven F Weinstein, Hugh H Windom, Neil L Kao, Mila A Leong, Vinay Mehta, Wendy C Moore, Saligrama Bhat, Bassil Aish, Steven M Meltzer, Mark H Moss, Edward M Kerwin, John Palsted Delgado, Gregg Hudson Lucksinger, Charles A Thompson, Sady A Alpizar, Sanjay Virgi Vadgama, Zahid Zafar, Joshua S Jacobs, NJira Lugogo, Neal Jain, Lawrence D Sher, Nabil S Andrawis, David Fuentes, Eric Jason Boren, Erika G Gonzalez, Neetu Talreja, Sheharyar Sandy Durrani, Sudhir Sekhsaria, Samuel DeLeon, Mayank Shukla, Martha M Totszollosy Tarpay, Faisal Fakih, Golda Hudes, Jeffrey P Tillinghast, Phillip E Korenblat, Kartik Shenoy, Loretta Que, Shahrukh Ahmad Kureishy, Fred Chukwuemeka Umeh, Vinh Nhu Nguyen, Hanh Thi Chu, and Thuy Thi Dieu Nguyen
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Pulmonary and Respiratory Medicine - Published
- 2023
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17. Ecological divergence of a mesocosm in an eastern boundary upwelling system assessed with multi-marker environmental DNA metabarcoding
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Markus A. Min, David M. Needham, Sebastian Sudek, N. Kobun Truelove, Kathleen J. Pitz, Gabriela M. Chavez, Camille Poirier, Bente Gardeler, Elisabeth von der Esch, Andrea Ludwig, Ulf Riebesell, Alexandra Z. Worden, and Francisco P. Chavez
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Ecology, Evolution, Behavior and Systematics ,Earth-Surface Processes - Abstract
Eastern boundary upwelling systems (EBUS) contribute a disproportionate fraction of the global fish catch relative to their size and are especially susceptible to global environmental change. Here we present the evolution of communities over 50 d in an in situ mesocosm 6 km offshore of Callao, Peru, and in the nearby unenclosed coastal Pacific Ocean. The communities were monitored using multi-marker environmental DNA (eDNA) metabarcoding and flow cytometry. DNA extracted from weekly water samples were subjected to amplicon sequencing for four genetic loci: (1) the V1–V2 region of the 16S rRNA gene for photosynthetic eukaryotes (via their chloroplasts) and bacteria; (2) the V9 region of the 18S rRNA gene for exploration of eukaryotes but targeting phytoplankton; (3) cytochrome oxidase I (COI) for exploration of eukaryotic taxa but targeting invertebrates; and (4) the 12S rRNA gene, targeting vertebrates. The multi-marker approach showed a divergence of communities (from microbes to fish) between the mesocosm and the unenclosed ocean. Together with the environmental information, the genetic data furthered our mechanistic understanding of the processes that are shaping EBUS communities in a changing ocean. The unenclosed ocean experienced significant variability over the course of the 50 d experiment, with temporal shifts in community composition, but remained dominated by organisms that are characteristic of high-nutrient upwelling conditions (e.g., diatoms, copepods, anchovies). A large directional change was found in the mesocosm community. The mesocosm community that developed was characteristic of upwelling regions when upwelling relaxes and waters stratify (e.g., dinoflagellates, nanoflagellates). The selection of dinoflagellates under the salinity-driven experimentally stratified conditions in the mesocosm, as well as the warm conditions brought about by the coastal El Niño, may be an indication of how EBUS will respond under the global environmental changes (i.e., increases in surface temperature and freshwater input, leading to increased stratification) forecast by the IPCC.
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- 2023
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18. Results of a Phase 2b Trial With GB001, a Prostaglandin D2 Receptor 2 Antagonist, in Moderate to Severe Eosinophilic Asthma
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Mark H. Moss, Njira L. Lugogo, Mario Castro, Nicola A. Hanania, Andrea Ludwig-Sengpiel, Dinesh Saralaya, Rafal Dobek, Iñigo Ojanguren, Ivan Vyshnyvetskyy, Jean-Marie Bruey, Robin Osterhout, Cindy-ann Tompkins, Karen Dittrich, Kartik Raghupathi, Hector Ortega, Institut Català de la Salut, [Moss MH] Division of Allergy, Pulmonary and Critical Care Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA. [Lugogo NL] Division of Pulmonary & Critical Care Medicine, University of Michigan, Ann Arbor, MI, USA. [Castro M] Division of Pulmonary, Critical Care & Sleep Medicine, University of Kansas, Kansas City, KS, USA. [Hanania NA] Section of Pulmonary & Critical Care Medicine, Baylor College of Medicine, Houston, TX, USA. [Ludwig-Sengpiel A] KLB Gesundheitsforschung Lübeck, Lübeck, Germany. [Saralaya D] NIHR PRC, Bradford Institute for Health Research, Bradford, England. [Ojanguren I] Servei de Pneumologia, Vall d’Hebron Hospital Universitari, Barcelona, Spain. Departament de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain. CIBER de Enfermedades Respiratorias, Barcelona, Catalonia, Spain, and Vall d'Hebron Barcelona Hospital Campus
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Pulmonary and Respiratory Medicine ,Otros calificadores::/uso terapéutico [Otros calificadores] ,Asma - Tractament ,Respiratory Tract Diseases::Bronchial Diseases::Asthma [DISEASES] ,Critical Care and Intensive Care Medicine ,enfermedades respiratorias::enfermedades bronquiales::asma [ENFERMEDADES] ,Respiratory Tract Diseases::Lung Diseases::Pulmonary Eosinophilia [DISEASES] ,enfermedades respiratorias::enfermedades pulmonares::eosinofilia pulmonar [ENFERMEDADES] ,Other subheadings::/therapeutic use [Other subheadings] ,acciones y usos químicos::acciones farmacológicas::usos terapéuticos::fármacos del sistema respiratorio::antiasmáticos [COMPUESTOS QUÍMICOS Y DROGAS] ,Cardiology and Cardiovascular Medicine ,Eosinofília ,Medicaments antiasmàtics - Ús terapèutic ,Chemical Actions and Uses::Pharmacologic Actions::Therapeutic Uses::Respiratory System Agents::Anti-Asthmatic Agents [CHEMICALS AND DRUGS] - Abstract
Asthma; Asthma worsening; Eosinophilic asthma Asma; Empitjorament de l'asma; Asma eosinofílica Asma; Empeoramiento del asma; Asma eosinofílica Background Prostaglandin D2 receptor 2 (DP2) antagonists inhibit prostaglandin D2-induced effects, including recruitment and activation of cells driving asthma pathogenesis. However, challenges identifying target population and end points persist. Research Question What is the effect of the DP2 antagonist GB001 on asthma worsening in patients with moderate to severe eosinophilic asthma? Study Design and Methods In this phase IIb, randomized, double-blind, placebo-controlled, dose-ranging, parallel-group, multicenter study, GB001 or placebo was added to standard-of-care treatment in patients with moderate to severe asthma with a blood eosinophil count ≥ 250 cells/μL. Patients aged ≥ 18 years to < 75 years received one of four once-daily treatments (GB001 20 mg, 40 mg, or 60 mg or placebo). The primary end point was the proportion of patients who experienced asthma worsening by 24 weeks. Efficacy analyses were performed for the intention-to-treat population and safety analyses for patients who received at least one dose of study treatment. Results A total of 480 patients were treated. The ORs for asthma worsening for GB001 20 mg, 40 mg, and 60 mg vs placebo were 0.674 (95% CI, 0.398-1.142), 0.677 (95% CI, 0.399-1.149), and 0.651 (95% CI, 0.385-1.100), respectively. Analysis according to baseline blood eosinophil levels and/or fractional exhaled nitric oxide did not show greater treatment effects with higher values. Elevated liver aminotransferase levels and adverse events leading to discontinuation were more frequent for GB001 60 mg than with placebo, GB001 20 mg, and GB001 40 mg. Interpretation Although GB001 did not significantly reduce the odds of asthma worsening, reductions favoring GB001 were observed. Treatment effects were consistent regardless of high/low type 2 phenotype. The overall safety profile was acceptable, although GB001 60 mg was associated with risk of liver injury. This work was supported by GB001, Inc., a wholly owned subsidiary of Gossamer Bio, Inc.
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- 2022
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19. Effects of nutrient enrichments on oligotrophic phytoplankton communities: a mesocosm experiment near Hawai‘i, USA
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D Böttjer-Wilson, Andrea Ludwig, E Shimabukuro, Matthew J. Church, Yoshimi M. Rii, S. Poulos, Angelicque E. White, David M. Karl, K von Brockel, Ricardo M. Letelier, Ulf Riebesell, and Karin M. Björkman
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0106 biological sciences ,Nutrient ,010504 meteorology & atmospheric sciences ,Ecology ,010604 marine biology & hydrobiology ,Phytoplankton ,Environmental science ,14. Life underwater ,Aquatic Science ,01 natural sciences ,Ecology, Evolution, Behavior and Systematics ,0105 earth and related environmental sciences ,Mesocosm - Abstract
A large-volume mesocosm-based nutrient perturbation experiment was conducted off the island of Hawai‘i, USA, to investigate the response of surface ocean phytoplankton communities to the addition of macronutrients, trace metals, and vitamins and to assess the feasibility of using mesocosms in the open ocean. Three free-drifting mesocosms (~60 m3) were deployed: one mesocosm served as a control (no nutrient amendments); a second (termed +P) was amended with nitrate (N), silicate (Si), phosphate (P), and a trace metal + vitamin mixture; and a third (termed -P) was amended with N, Si, and a trace metal + vitamin mixture but no P. These mesocosms were unreplicated due to logistical constraints and hence differences between treatments are qualitative. After 6 d, the largest response of the phytoplankton community was observed in the +P mesocosm, where chlorophyll a and 14C-based primary production were 2-3× greater than in the -P mesocosm and 4-6× greater than in the control. Comparison between mesocosm and ‘microcosm’ incubations (20 l) revealed differences in the magnitude and timing of production and marked differences in community structure with a reduced response of diatoms in microcosm treatments. Notably, we also observed pronounced declines in Prochlorococcus populations in all treatments, although these were greater in microcosms (up to 99%). Overall, this study confirmed the feasibility of deploying free-drifting mesocosms in the open ocean as a potentially powerful tool to investigate ecological impacts of nutrient perturbations and constitutes a valuable first step towards scaling plankton manipulation experiments.
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- 2021
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20. Supplementary material to 'Ecological divergence of a mesocosm in an eastern boundary upwelling system assessed with multi-marker environmental DNA metabarcoding'
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Markus A. Min, David M. Needham, Sebastian Sudek, N. Kobun Truelove, Kathleen J. Pitz, Gabriela M. Chavez, Camille Poirier, Bente Gardeler, Elisabeth von der Esch, Andrea Ludwig, Ulf Riebesell, Alexandra Z. Worden, and Francisco P. Chavez
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- 2022
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21. Effect of Recent Exacerbation History on the Efficacy of Once-Daily Single-Inhaler Fluticasone Furoate/Umeclidinium/Vilanterol Triple Therapy in Patients with Chronic Obstructive Pulmonary Disease in the FULFIL Trial
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Reynold A Panettieri Jr, Carlos A Camargo Jr, Tariq Cheema, Sherif G El Bayadi, Stanley Fiel, Tania M Vila, Renu G Jain, Dawn Midwinter, Byron Thomashow, Andrea Ludwig-Sengpiel, and David A Lipson
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Androstadienes ,Pulmonary Disease, Chronic Obstructive ,Quinuclidines ,Nebulizers and Vaporizers ,Administration, Inhalation ,Budesonide, Formoterol Fumarate Drug Combination ,Fluticasone ,Humans ,General Medicine ,International Journal of Chronic Obstructive Pulmonary Disease ,Chlorobenzenes ,Benzyl Alcohols ,Bronchodilator Agents - Abstract
Reynold A Panettieri Jr,1 Carlos A Camargo Jr,2 Tariq Cheema,3 Sherif G El Bayadi,4 Stanley Fiel,5 Tania M Vila,6 Renu G Jain,6 Dawn Midwinter,7 Byron Thomashow,8 Andrea Ludwig-Sengpiel,9 David A Lipson10,11 1Child Health Institute of New Jersey, Rutgers University School of Medicine, New Brunswick, NJ, USA; 2Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; 3Breathing Disorder Center, Allegheny Health Network, Pittsburgh, PA, USA; 4Department of Medicine, St. Josephâs Health/SUNY Upstate, Syracuse, NY, USA; 5Atlantic Health Systems/Morristown Medical Center, Morristown, NJ, 07960, USA; 6GSK, Research Triangle Park, NC, USA; 7GSK, Brentford, UK; 8Department of Medicine, Columbia University Medical Center, New York, NY, USA; 9KLB Gesundheitsforschung Lübeck GmbH, Lübeck, Germany; 10Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; 11GSK, Collegeville, PA, USACorrespondence: Reynold A Panettieri Jr, Rutgers University School of Medicine, 89 French Street, Suite 4210, New Brunswick, NJ, 08901, USA, Tel +1 732-235-6404, Email rp856@rbhs.rutgers.eduBackground: In the FULFIL trial, once-daily single-inhaler triple therapy with fluticasone furoate/umeclidinium/vilanterol (FF/UMEC/VI) resulted in reduced moderate/severe exacerbation rates and conferred significant improvements in lung function and health status in patients with chronic obstructive pulmonary disease (COPD) versus twice-daily budesonide/formoterol (BUD/FOR) dual therapy.Methods: FULFIL was a Phase III, randomized, double-blind, double-dummy, parallel-group study. Patients ⥠40 years of age with symptomatic COPD were randomized 1:1 to FF/UMEC/VI 100/62.5/25 mcg or BUD/FOR 400/12 mcg. In this post hoc analysis, patients were categorized by exacerbation history in the year prior to study entry (⥠1 moderate/severe exacerbation [recent exacerbation] versus no recent exacerbation). Endpoints included annual rate of on-treatment moderate/severe exacerbations up to Week 24, annual rate of on-treatment severe exacerbations up to Week 24, change from baseline in trough forced expiratory volume in 1 second at Week 24, and change from baseline in health status as measured by St Georgeâs respiratory questionnaire total score at Week 24.Results: Of the 1810 patients in the intent-to-treat population, 1180 (65%) had one or more moderate/severe exacerbation in the year prior to entry, while 630 (35%) patients did not. FF/UMEC/VI versus BUD/FOR significantly reduced moderate/severe exacerbation rates in the recent exacerbation subgroup (mean annualized rate: 0.19 vs 0.29; rate ratio [95% confidence interval [CI]]: 0.64: [0.45, 0.91]; p=0.014) and numerically reduced moderate/severe exacerbation rates in the no recent exacerbation subgroup (mean annualized rate: 0.29 vs 0.43; rate ratio [95% CI]: 0.67 [0.43, 1.04]; p=0.073). Severe exacerbation rates were numerically reduced with FF/UMEC/VI versus BUD/FOR treatment across both subgroups. FF/UMEC/VI conferred significant improvements in lung function and health status versus BUD/FOR, regardless of recent exacerbation history.Conclusion: FF/UMEC/VI reduced moderate/severe and severe exacerbation rates and improved lung function and health status versus BUD/FOR in patients with symptomatic COPD, regardless of recent exacerbation history.Keywords: COPD, exacerbations, severe exacerbations, triple therapy, ICS/LABA
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- 2022
22. Non-typeable Haemophilus influenzae-Moraxella catarrhalis vaccine for the prevention of exacerbations in chronic obstructive pulmonary disease: a multicentre, randomised, placebo-controlled, observer-blinded, proof-of-concept, phase 2b trial
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Stefan Andreas, Marco Testa, Laurent Boyer, Guy Brusselle, Wim Janssens, Edward Kerwin, Alberto Papi, Bonavuth Pek, Luis Puente-Maestu, Dinesh Saralaya, Henrik Watz, Tom M A Wilkinson, Daniela Casula, Gennaro Di Maro, Maria Lattanzi, Luca Moraschini, Sonia Schoonbroodt, Annaelisa Tasciotti, Ashwani K Arora, François Maltais, Jean-Louis Corhay, Eduard Janssens, Mathias Leys, Murdo Ferguson, Mark Fitzgerald, Irvin Mayers, Shelly McNeil, Arnaud Bourdin, Francis Couturaud, Luc Dussart, Gabriele Illies, Andreas Eich, Andrea Ludwig-Sengpiel, Francesco Blasi, Stefano Centanni, Carlo Pomari, José Maria Echave-Sustaeta, Eleuterio Llorca Martínez, Silvia Narejos Pérez, Sergi Pascual-Guardia, Mercè Pérez Vera, Manuel Terns Riera, William Anderson, Gourab Choudhury, Anthony De-Soyza, Tom MA Wilkinson, Joseph Boscia III, Kenneth Chinsky, Leonard Dunn, David Erb, Charles Fogarty, Herman Jackson Downey, Craig Kunz, Terry Poling, Richard Sellman, Barry Sigal, John Southard, Selwyn Spangenthal, Ziad Tannous, Georg-August-University = Georg-August-Universität Göttingen, GlaxoSmithKline [Siena, Italy] (GSK), Hôpital Henri Mondor, Institut Mondor de Recherche Biomédicale (IMRB), Institut National de la Santé et de la Recherche Médicale (INSERM)-IFR10-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Ghent University Hospital, University Hospitals Leuven [Leuven], Università degli Studi di Ferrara = University of Ferrara (UniFE), Centre Hospitalier Régional de Lanaudiere, Joliette, Quebec, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Bradford Teaching Hospitals NHS Foundation Trust [Bradford, UK] (BTHFT), Pulmonary Research Institute at Lungen Clinic Grosshansdorf, Airway Research Center North, German Center for Lung Research, Grosshansdorf, University of Southampton, GlaxoSmithKline Pharmaceuticals [Rixensart] (GSK), Institut Universitaire de Cardiologie et de Pneumologie de Québec (IUCPQ), Université Laval [Québec] (ULaval), Physiologie & médecine expérimentale du Cœur et des Muscles [U 1046] (PhyMedExp), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), and NTHi-Mcat-002 study group Guy Brusselle Jean-Louis Corhay Eduard Janssens Wim Janssens Mathias Leys Murdo Ferguson Mark Fitzgerald François Maltais Irvin Mayers Shelly McNeil Bonavuth Pek Arnaud Bourdin Laurent Boyer Francis Couturaud Luc Dussart Stefan Andreas Gabriele Illies Andreas Eich Andrea Ludwig-Sengpiel Henrik Watz Francesco Blasi Stefano Centanni Alberto Papi Carlo Pomari José Maria Echave-Sustaeta Eleuterio Llorca Martínez Silvia Narejos Pérez Sergi Pascual-Guardia Mercè Pérez Vera Luis Puente-Maestu Manuel Terns Riera William Anderson Gourab Choudhury Anthony De-Soyza Dinesh Saralaya Tom MA Wilkinson Joseph Boscia III Kenneth Chinsky Leonard Dunn David Erb Charles Fogarty Herman Jackson Downey Edward Kerwin Craig Kunz Terry Poling Richard Sellman Barry Sigal John Southard Selwyn Spangenthal Ziad Tannous Marco Testa Daniela Casula Gennaro Di Maro Maria Lattanzi Luca Moraschini Sonia Schoonbroodt Annaelisa Tasciotti Ashwani K Arora
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Pulmonary and Respiratory Medicine ,Adult ,Vaccines ,[SDV]Life Sciences [q-bio] ,Sputum ,Socio-culturale ,Haemophilus influenzae ,Pulmonary Disease, Chronic Obstructive ,Double-Blind Method ,vaccine ,Chronic obstructive pulmonary disease (COPD) exacerbations, Haemophilus influenzae, Moraxella catarrhalis, vaccine ,Humans ,Moraxella catarrhalis ,Chronic obstructive pulmonary disease (COPD) exacerbations - Abstract
International audience; BackgroundAcute exacerbations of chronic obstructive pulmonary disease (AECOPD) are associated with changes in the sputum microbiome, including an increased prevalence of pathogenic bacteria. Vaccination against the most frequent bacteria identified in AECOPD might reduce exacerbation frequency. We assessed the efficacy, safety, and immunogenicity of a candidate vaccine containing surface proteins from non-typeable Haemophilus influenzae (NTHi) and Moraxella catarrhalis (Mcat) in patients with COPD.MethodsThis multicentre, randomised, observer-blinded, placebo-controlled, proof-of-concept, phase 2b trial recruited patients with stable COPD, moderate-to-very severe airflow limitation (Global Initiative for Chronic Obstructive Lung Disease [GOLD] stage 2, 3, or 4), at 67 clinical sites in Belgium, Canada, France, Germany, Italy, Spain, UK, and USA. Eligible patients were aged 40–80 years and had a history of at least one moderate or severe exacerbation in the previous year. Patients were allocated (1:1) using a minimisation algorithm to receive two intramuscular injections of NTHi–Mcat vaccine or placebo 60 days apart, in addition to standard care. The allocation algorithm considered age category, number of previous exacerbations, COPD severity at study entry, and country as minimisation factors, to guarantee treatment balance within each factor. Vaccine recipients and those responsible for evaluating study endpoints were masked to group allocation. In the analysis of efficacy, the primary outcome was the rate of any moderate or severe AECOPD occurring within a 1-year period, starting 1 month after the second dose in patients who received two vaccine doses (modified total vaccinated cohort). Safety was assessed in the total vaccinated cohort. The trial is registered with ClinicalTrials.gov, number NCT03281876, and is complete.FindingsBetween Nov 27, 2017, and Nov 30, 2018, 606 adults were enrolled and included in the total vaccinated cohort (304 in the NTHi–Mcat vaccine group, 302 in the placebo group); 571 received two doses and were included in the primary efficacy analysis (279 in the NTHi–Mcat vaccine group, 292 in the placebo group). 23 participants dropped-out in the NTHi–Mcat vaccine group and 39 in the placebo group; this included 4 patients in the NTHi–Mcat vaccine group and 15 in the placebo group who withdrew from the study because of an adverse event. The primary analysis included 340 exacerbations (in follow-up time 102 123 days) in the NTHi–Mcat vaccine group and 333 (in 104 443 days) in the placebo group, with a yearly rate of moderate or severe AECOPD of 1·22 in the NTHi–Mcat vaccine group and 1·17 in the placebo group, with vaccine efficacy in reducing the yearly rate of moderate or severe AECOPD estimated to be zero (vaccine efficacy point estimate 2·26% [87% CI –18·27 to 11·58]; p=0·82). Solicited local adverse events were more frequent in the NTHi–Mcat vaccine group (216 [72%] of 301 patients) than with placebo (34 [11%] of 299 patients), and the frequency of solicited general adverse events was similar between groups (239 [79%] of 301 vs 235 [79%] of 299 patients). There was one death in the NTHi–Mcat vaccine group (acute respiratory failure, not related to vaccination) and ten in the placebo group (seven due in part to COPD or respiratory failure). There were 158 serious adverse events (89 [29%] of 304 patients) in the NTHi–Mcat vaccine group, not related to vaccination, and 214 (99 [33%] of 302 patients) in the placebo group.InterpretationNTHi–Mcat vaccine administered to patients with COPD did not show efficacy in reducing the yearly rate of moderate or severe exacerbations. No safety concerns were identified.
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- 2021
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23. Results of a Phase 2b Trial With GB001, a Prostaglandin D
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Mark H, Moss, Njira L, Lugogo, Mario, Castro, Nicola A, Hanania, Andrea, Ludwig-Sengpiel, Dinesh, Saralaya, Rafal, Dobek, Iñigo, Ojanguren, Ivan, Vyshnyvetskyy, Jean-Marie, Bruey, Robin, Osterhout, Cindy-Ann, Tompkins, Karen, Dittrich, Kartik, Raghupathi, and Hector, Ortega
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Treatment Outcome ,Double-Blind Method ,Disease Progression ,Prostaglandins ,Humans ,Drug Therapy, Combination ,Anti-Asthmatic Agents ,Pulmonary Eosinophilia ,Antibodies, Monoclonal, Humanized ,Asthma - Abstract
Prostaglandin DWhat is the effect of the DPIn this phase IIb, randomized, double-blind, placebo-controlled, dose-ranging, parallel-group, multicenter study, GB001 or placebo was added to standard-of-care treatment in patients with moderate to severe asthma with a blood eosinophil count ≥ 250 cells/μL. Patients aged ≥ 18 years to 75 years received one of four once-daily treatments (GB001 20 mg, 40 mg, or 60 mg or placebo). The primary end point was the proportion of patients who experienced asthma worsening by 24 weeks. Efficacy analyses were performed for the intention-to-treat population and safety analyses for patients who received at least one dose of study treatment.A total of 480 patients were treated. The ORs for asthma worsening for GB001 20 mg, 40 mg, and 60 mg vs placebo were 0.674 (95% CI, 0.398-1.142), 0.677 (95% CI, 0.399-1.149), and 0.651 (95% CI, 0.385-1.100), respectively. Analysis according to baseline blood eosinophil levels and/or fractional exhaled nitric oxide did not show greater treatment effects with higher values. Elevated liver aminotransferase levels and adverse events leading to discontinuation were more frequent for GB001 60 mg than with placebo, GB001 20 mg, and GB001 40 mg.Although GB001 did not significantly reduce the odds of asthma worsening, reductions favoring GB001 were observed. Treatment effects were consistent regardless of high/low type 2 phenotype. The overall safety profile was acceptable, although GB001 60 mg was associated with risk of liver injury.ClinicalTrials.gov; No.: NCT03683576; URL: www.gov.
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- 2021
24. Evaluation of the oral corticosteroid-sparing effect of tezepelumab in adults with oral corticosteroid-dependent asthma (SOURCE): a randomised, placebo-controlled, phase 3 study
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Michael E Wechsler, Andrew Menzies-Gow, Christopher E Brightling, Piotr Kuna, Stephanie Korn, Tobias Welte, Janet M Griffiths, Kinga Sałapa, Åsa Hellqvist, Gun Almqvist, Harbans Lal, Primal Kaur, Tor Skärby, Gene Colice, Victor H Cambursano, Marcelo J Fernandez, Fernando D Scherbovsky, Anahi Yanez, Alberto J Tolcachier, Ana M Stok, Fernando J B Verra, Karin Forster, Mathias Rolke, Andrea Ludwig-Sengpiel, Tibor Schmoller, Olaf Schmidt, Katrin Milger-Kneidinger, Martin Hoffmann, Hilke Temme, Anneliese Linnhoff, Joachim Kirschner, Barbara Rewerska, Ewa Pisarczyk-Bogacka, Sang Haak Lee, Byung Jae Lee, Heung-Woo Park, Jung-Won Park, Sook Young Lee, You Sook Cho, Kwan Ho Lee, Sevim Bavbek, Bilun Gemicioglu, Dane Ediger, Ilkay Koca Kalkan, Ismail Hanta, Arzu Yorgancioglu, Yevgeniya DytyatkovsKa, Yuriy M Mostovoy, Kyrylo Lebed, Oleh Yakovenko, David I Bernstein, Jeffrey P Tillinghast, Loretta Que, Jan Madison, Todd Rambasek, Kartik Shenoy, Charles A Thompson, Christopher M Chappel, Golda Hudes, Ehab Sorial, Shahrukh A Kureishy, Syed M Rehman, Njira Lugogo, Erika G Gonzalez, Fred C Umeh, Eric J Boren, Jason Sigmon, Hummayun Ismail, Arjun Mohan, Sandeep Bansal, and Thomas D Kaelin
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Pulmonary and Respiratory Medicine ,Adult ,Eosinophils ,Treatment Outcome ,Double-Blind Method ,Adrenal Cortex Hormones ,Humans ,Antibodies, Monoclonal, Humanized ,Asthma - Abstract
Tezepelumab is a human monoclonal antibody that blocks the activity of thymic stromal lymphopoietin. SOURCE evaluated the oral corticosteroid-sparing effect of tezepelumab in adults with oral corticosteroid-dependent asthma.We conducted this phase 3, multicentre, randomised, double-blind, placebo-controlled study across 60 sites in seven countries. Participants aged 18-80 years with physician-diagnosed asthma, who had been receiving medium-dose or high-dose inhaled corticosteroids and had at least one asthma exacerbation in the 12 months before screening were eligible. Patients who were receiving medium-dose inhaled corticosteroids must have had their dose increased to a high dose for at least 3 months before screening. After an oral corticosteroid optimisation phase of up to 8 weeks, participants were randomly assigned according to a computer-generated fixed block randomisation sequence to receive tezepelumab 210 mg or placebo subcutaneously every 4 weeks during a 48 week treatment period (4 week induction phase, 36 week oral corticosteroid reduction phase, and 8 week maintenance phase). Randomisation was stratified by region. Participants, investigators, and site staff were masked to treatment assignment. The primary endpoint was the categorised percentage reduction from baseline in daily oral corticosteroid dose at week 48 without the loss of asthma control. Efficacy and safety endpoints were assessed in all participants who received at least one dose of study drug. This study is registered with ClinicalTrials.gov, NCT03406078.Between March 5, 2018, and Sept 27, 2019, 150 participants were randomly assigned to receive tezepelumab 210 mg (n=74) or placebo (n=76). The cumulative odds of achieving a category of greater percentage reduction in an oral corticosteroid dose for daily maintenance at week 48 were similar with tezepelumab or placebo in the overall population (odds ratio [OR] 1·28 [95% CI 0·69-2·35], p=0·43; the primary endpoint was not met). The cumulative odds were higher with tezepelumab than with placebo in participants with baseline blood eosinophil counts of at least 150 cells per μL (2·58 [1·16-5·75]), but not in participants with counts below 150 cells per μL (0·40 [0·14-1·13]). Tezepelumab was well tolerated, with no safety concerns identified. 53 (72%) of 74 tezepelumab-assigned participants and 65 (86%) of 76 placebo-assigned participants reported an adverse event. Serious adverse events were reported in 12 (16%) participants in the tezepelumab group and 16 (21%) participants in the placebo group.We did not observe a significant improvement in oral corticosteroid dose reduction with tezepelumab versus placebo in the overall population of this oral corticosteroid-sparing study, although an improvement was observed in participants with baseline blood eosinophil counts of at least 150 cells per μL.AstraZeneca and Amgen.
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- 2021
25. Nitrogen loss processes in response to upwelling in a Peruvian coastal setting dominated by denitrification – a mesocosm approach
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Tim Boxhammer, Andrea Ludwig, Lennart T. Bach, Bess B. Ward, Isabel Baños, Maricarmen Igarza, Javier Arístegui, Carolin R. Löscher, Fabrizio Minutolo, Ulf Riebesell, Dirk V. Erler, Elisabeth von der Esch, Judith Meyer, Eric P. Achterberg, Verena Kalter, Kai G. Schulz, and Jana Meyer
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Denitrification ,010504 meteorology & atmospheric sciences ,chemistry.chemical_element ,01 natural sciences ,Mesocosm ,03 medical and health sciences ,Life ,QH501-531 ,Phytoplankton ,Organic matter ,14. Life underwater ,Nitrogen cycle ,QH540-549.5 ,Ecology, Evolution, Behavior and Systematics ,030304 developmental biology ,0105 earth and related environmental sciences ,Earth-Surface Processes ,chemistry.chemical_classification ,QE1-996.5 ,0303 health sciences ,Ecology ,Biological pump ,Geology ,Nitrogen ,6. Clean water ,ddc ,chemistry ,Anammox ,Environmental chemistry ,Environmental science - Abstract
Upwelling of nutrient-rich deep waters make eastern boundary upwelling systems (EBUSs), such as the Humboldt Current system, hot spots of marine productivity. Associated settling of organic matter to depth and consecutive aerobic decomposition results in large subsurface water volumes being oxygen depleted. Under these circumstances, organic matter remineralisation can continue via denitrification, which represents a major loss pathway for bioavailable nitrogen. Additionally, anaerobic ammonium oxidation can remove significant amounts of nitrogen in these areas. Here we assess the interplay of suboxic water upwelling and nitrogen cycling in a manipulative offshore mesocosm experiment. Measured denitrification rates in incubations with water from the oxygen-depleted bottom layer of the mesocosms (via 15N label incubations) mostly ranged between 5.5 and 20 nmol N2 L−1 h−1 (interquartile range), reaching up to 80 nmol N2 L−1 h−1. However, actual in situ rates in the mesocosms, estimated via Michaelis–Menten kinetic scaling, did most likely not exceed 0.2–4.2 nmol N2 L−1 h−1 (interquartile range) due to substrate limitation. In the surrounding Pacific, measured denitrification rates were similar, although indications of substrate limitation were detected only once. In contrast, anammox (anaerobic ammonium oxidation) made only a minor contribution to the overall nitrogen loss when encountered in both the mesocosms and the Pacific Ocean. This was potentially related to organic matter C / N stoichiometry and/or process-specific oxygen and hydrogen sulfide sensitivities. Over the first 38 d of the experiment, total nitrogen loss calculated from in situ rates of denitrification and anammox was comparable to estimates from a full nitrogen budget in the mesocosms and ranged between ∼ 1 and 5.5 µmol N L−1. This represents up to ∼ 20 % of the initially bioavailable inorganic and organic nitrogen standing stocks. Interestingly, this loss is comparable to the total amount of particulate organic nitrogen that was exported into the sediment traps at the bottom of the mesocosms at about 20 m depth. Altogether, this suggests that a significant portion, if not the majority of nitrogen that could be exported to depth, is already lost, i.e. converted to N2 in a relatively shallow layer of the surface ocean, provided that there are oxygen-deficient conditions like those during coastal upwelling in our study. Published data for primary productivity and nitrogen loss in all EBUSs reinforce such conclusion.
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- 2021
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26. TRONARTO: A Randomized, Placebo-Controlled Study of Tiotropium/Olodaterol Delivered via Soft Mist Inhaler in COPD Patients Stratified by Peak Inspiratory Flow
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Gary T. Ferguson, Alberto de la Hoz, John Ritz, Asif Shaikh, Donald A. Mahler, Andrea Ludwig-Sengpiel, and Henrik Watz
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tiotropium/olodaterol ,Placebo-controlled study ,International Journal of Chronic Obstructive Pulmonary Disease ,Placebo ,inhaler ,chemistry.chemical_compound ,Pulmonary Disease, Chronic Obstructive ,Medicine ,Humans ,Tiotropium Bromide ,Peak flow meter ,measurement_unit ,Original Research ,COPD ,SMI ,Inhalation ,business.industry ,Inhaler ,Olodaterol ,Area under the curve ,Dry Powder Inhalers ,lung function ,General Medicine ,medicine.disease ,Benzoxazines ,Bronchodilator Agents ,peak inspiratory flow ,chemistry ,Anesthesia ,measurement_unit.measuring_instrument ,business - Abstract
Background Inhaled bronchodilator therapy is currently the mainstay of treatment for patients with chronic obstructive pulmonary disease (COPD). Some inhalers require patients to achieve certain inhalation efforts either to activate the device or to deliver medication to the site of action. For dry powder inhalers, low peak inspiratory flow (PIF) can result in poor medication delivery but the clinical significance of this is not well understood. Methods TRONARTO was a 4-week, randomized, double-blind, placebo-controlled, multicenter, parallel-group study which stratified patients with moderate-to-severe COPD according to their PIF against medium-low resistance at screening. Patients were randomized to receive tiotropium/olodaterol (5 μg/5 μg) or matched placebo delivered via the Respimat® Soft Mist™ inhaler (SMI). After 4 weeks of treatment, we assessed change from baseline in forced expiratory volume in 1 second (FEV1) area under the curve 0–3 hours (FEV1 AUC0–3h) and trough FEV1. Results Overall, 213 patients were randomized, of whom 106 received tiotropium/olodaterol (PIF, Graphical Abstract
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- 2021
27. Organisationales Lernen und Digitalisierung : Lernen von und in Organisationen unter dem Einfluss der digitalen Transformation
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Andrea Ludwig and Andrea Ludwig
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- Industrial organization, Knowledge management, Personnel management
- Abstract
Das Buch zeigt anhand aktueller Forschungsthemen und Praxisbeispiele, welche Veränderungen die digitale Transformation in den Lernprozessen von und in Organisationen ausgelöst hat. Anpassungen von Organisationen auf Veränderungen sind die Basis für Innovationsprozesse, die wiederum auf den Ergebnissen der individuellen Lernprozesse der Mitarbeiter•innen und einem fluiden Wissensmanagement in den Organisationen aufbauen. Innovative digitale Lernformen und -formate, digitale Kollaborationstools und ein fließendes Wissensmanagement sind Voraussetzung für eine lernende Organisation und damit für ein gelingendes Change Management. Nach einer kurzen Einführung in die Thematik der digitalen Transformation und den Herausforderungen für Organisationen fokussiert sich die Autorin auf das organisationale Lernen, erforderliche Grundbausteine in Bezug auf das digitale und selbstgesteuerte Lernen sowie verschiedene Ausprägungen von digitalen Lernangeboten. Dabei werden neue digitale Lernformen und -strukturen auch unter dem Einfluss von KI aufgezeigt und mit Praxisbeispielen sowie aktuellen Forschungsergebnissen angereichert. Anschließend beleuchtet die Autorin das organisationale Wissensmanagement und dessen rasante Weiterentwicklung in den letzten Jahren.
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- 2024
28. Nitrogen loss processes in response to upwelling in a Peruvian coastal setting dominated by denitrification
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Javier Arístegui, Verena Kalter, Dirk V. Erler, Carolin R. Löscher, Bess B. Ward, Isabel Baños, Tim Boxhammer, Lennart T. Bach, Jana Meyer, Elisabeth von der Esch, Kai G. Schulz, Maricarmen Igarza, Eric P. Achterberg, Andrea Ludwig, Fabrizio Minutolo, Ulf Riebesell, and Judith Meyer
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chemistry.chemical_classification ,Remineralisation ,Denitrification ,chemistry ,Anammox ,Environmental chemistry ,chemistry.chemical_element ,Upwelling ,Environmental science ,Organic matter ,Nitrogen ,Nitrogen cycle ,Mesocosm - Abstract
Upwelling of nutrient-rich deep waters make Eastern Boundary upwelling systems (EBUS), such as the Humboldt Current System, hotspots of marine productivity. Associated settling of organic matter to depth and consecutive aerobic de composition results in large sub-surface water volumes being oxygen-depleted. Under these circumstances organic matter remineralisation can continue via denitrification which represents a major loss pathway of bioavailable nitrogen. Another process removing significant amounts of nitrogen in these areas is anaerobic ammonium oxidation. Here we assess the interplay of suboxic water upwelling and nitrogen cycling in a manipulative off-shore mesocosm experiment. Measured denitrification rates in the oxygen-depleted bottom layer of the mesocosms mostly ranged between 5.5–20 (interquartile range), reaching up to 80 nmol N2 L−1 h−1. However, realised in-situ rates did most likely not exceed 0.6–1.6 nmol N2 L−1 h−1 (interquartile range), due to substrate limitation in the mesocosms. This was in contrast to realised rates in the surrounding Pacific. Both in the mesocosms and the Pacific Ocean anammox made only a minor contribution to overall nitrogen loss when encountered. Over the first 38 days of the experiment, total nitrogen loss calculated from denitrification and anammox rates was comparable to estimates from a full nitrogen budget in the mesocosms and ranged between ∼ 2–6 μmol N L−1. This represents up to ∼ 20 % of the initially bioavailable inorganic and organic nitrogen standing stocks. Interestingly, this loss is comparable to the total amount of particulate organic nitrogen that was exported into the sediment traps at the bottom of the mesocosms in about 20 metres depth. Altogether, this suggests that a significant portion, if not the majority of nitrogen that could be exported to depth, is already lost, i.e. converted to N2 in a relatively shallow layer of the surface ocean, provided oxygen-deficient conditions like during coastal upwelling in our study.
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- 2021
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29. Auswirkung der Digitalisierung auf soziale Organisationen – betrachtet anhand der Wirkfaktoren nach Sackmann
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Birgit Wolf and Andrea Ludwig
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Wie bereits in Abschn. 3.4 dargelegt, bilden die zwolf Wirkfaktoren der Organisationskultur nach Sackmann eine der theoretischen Grundlagen fur dieses Praxisbuch. Anhand dieser Faktoren kann eine Organisation bzw. ihre Kultur betrachtet werden. Die Autorinnen wenden in diesem Kapitel diese Wirkfaktoren speziell auf soziale Organisationen an (Abb. 5.1). Dabei betrachten sie die Auswirkungen der Digitalisierung mit ihren Vorteilen als auch Herausforderungen anhand von ganz konkreten Praxisbeispielen. Den Schwerpunkt legen sie auf den Aspekt des Lernens, der Kommunikation und der Zusammenarbeit zur Entwicklung von Personal und Organisationen.
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- 2021
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30. Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem: A Mesocosm Study
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Silke Lischka, Jean-Marie Bouquet, Alice Nauendorf, Tim Boxhammer, Michael Sswat, Nicole Aberle, Joselynn R. Wallace, Isabel Dörner, Anna K. Lechtenbörger, Paul Stange, Jan Taucher, Kai T. Lohbeck, Fabrizio Minutolo, Jaw C. Yong, Andrew L. King, Andrea Ludwig, Peter Kohnert, Lennart T. Bach, Ulf Riebesell, Stefanie M. H. Ismar-Rebitz, Michael Krudewig, Carsten Spisla, Mathias Haunost, Jana Meyer, Verena Kalter, and Bettany D. Jenkins
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0106 biological sciences ,lcsh:QH1-199.5 ,010504 meteorology & atmospheric sciences ,plankton ecology ,ocean acidification ,Ocean Engineering ,lcsh:General. Including nature conservation, geographical distribution ,Aquatic Science ,Oceanography ,01 natural sciences ,Mesocosm ,Total inorganic carbon ,biogeochemistry ,ddc:570 ,Phytoplankton ,climate change, ocean acidification, plankton ecology, biogeochemistry, coastal ecosystem, mesocosm ,14. Life underwater ,lcsh:Science ,0105 earth and related environmental sciences ,Water Science and Technology ,Global and Planetary Change ,010604 marine biology & hydrobiology ,fungi ,Biogeochemistry ,Pelagic zone ,Ocean acidification ,Plankton ,mesocosm ,Food web ,climate change ,13. Climate action ,coastal ecosystem ,Environmental science ,lcsh:Q - Abstract
The oceans’ uptake of anthropogenic carbon dioxide (CO2) decreases seawater pH and alters the inorganic carbon speciation – summarized in the term ocean acidification (OA). Already today, coastal regions experience episodic pH events during which surface layer pH drops below values projected for the surface ocean at the end of the century. Future OA is expected to further enhance the intensity of these coastal extreme pH events. To evaluate the influence of such episodic OA events in coastal regions, we deployed eight pelagic mesocosms for 53 days in Raunefjord, Norway, and enclosed 56–61 m3 of local seawater containing a natural plankton community under nutrient limited post-bloom conditions. Four mesocosms were enriched with CO2 to simulate extreme pCO2 levels of 1978 – 2069 μatm while the other four served as untreated controls. Here, we present results from multivariate analyses on OA-induced changes in the phyto-, micro-, and mesozooplankton community structure. Pronounced differences in the plankton community emerged early in the experiment, and were amplified by enhanced top-down control throughout the study period. The plankton groups responding most profoundly to high CO2 conditions were cyanobacteria (negative), chlorophyceae (negative), auto- and heterotrophic microzooplankton (negative), and a variety of mesozooplanktonic taxa, including copepoda (mixed), appendicularia (positive), hydrozoa (positive), fish larvae (positive), and gastropoda (negative). The restructuring of the community coincided with significant changes in the concentration and elemental stoichiometry of particulate organic matter. Results imply that extreme CO2 events can lead to a substantial reorganization of the planktonic food web, affecting multiple trophic levels from phytoplankton to primary and secondary consumers. Copyright © 2021 Spisla, Taucher, Bach, Haunost, Boxhammer, King, Jenkins, Wallace, Ludwig, Meyer, Stange, Minutolo, Lohbeck, Nauendorf, Kalter, Lischka, Sswat, Dörner, Ismar-Rebitz, Aberle, Yong, Bouquet, Lechtenbörger, Kohnert, Krudewig and Riebesell. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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- 2021
31. Fazit und Ausblick
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Andrea Ludwig and Birgit Wolf
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- 2021
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32. Veränderungsmanagement in der Sozialwirtschaft
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Andrea Ludwig and Birgit Wolf
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- 2021
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33. Organisationskultur und dessen Bedeutung
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Birgit Wolf and Andrea Ludwig
- Abstract
In diesem Kapitel werden in kurzer Form die verschiedenen Ansatze und Modelle vorgestellt, die wegweisend fur die Entwicklung der Betrachtung der Organisationskultur sind. Sie bieten damit den theoretischen Hintergrund fur die eingesetzten Methoden im Fortgang dieses Buches. Vor diesem Hintergrund wird uber gelingende Veranderungsprozesse berichtet, um Handlungsoptionen aufzuzeigen. Es werden Methoden zur Messung von Organisationskultur beschrieben. Besonderes Augenmerk wird auf die Arbeit mit Werten gelegt, da sie die Organisationskultur wesentlich bestimmen. Bezugnehmend auf Frau Prof. Sackmann wird die Wechselwirkung von Erfolgsfaktoren der Organisation und verschiedenen Kulturfaktoren dargestellt.
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- 2021
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34. Systemrelevante Rahmenbedingungen in der Sozialwirtschaft
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Birgit Wolf and Andrea Ludwig
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Die Sozialwirtschaft hat in den letzten Jahren eine ganze Reihe an nennenswerten und damit systemrelevanten Veranderungen der Rahmenbedingungen durchlaufen. Die Autorinnen zeigen drei der ihrer Meinung nach besonders relevanten Faktoren auf: die neue Generation an Arbeiternehmer*innen auf dem Arbeitsmarkt, besonders relevante Anderungen in den rechtlichen Grundlagen sowie die Digitalisierung und ihre besondere Dynamik. Diese Faktoren beeinflussen masgeblich die Personal- und Organisationsentwicklung in den Organisationen und sollten in Veranderungsprozessen mindestens mitgedacht und idealerweise proaktiv einbezogen werden.
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- 2021
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35. Gastbeitrag: Mit Diversity die Transformation gestalten
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Andrea Ludwig and Birgit Wolf
- Abstract
Organisationen und Unternehmen stehen derzeit vor gravierenden Herausforderungen, um sich zukunftsfahig aufzustellen beziehungsweise zu bleiben. Dabei gibt es zwar Unterschiede zwischen Branchen, zwischen Stadt und Land, zwischen Klein- und Grosunternehmen, aber die grundsatzlichen Tendenzen sind fur alle gleich
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- 2021
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36. Einleitung
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Andrea Ludwig and Birgit Wolf
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- 2021
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37. Aus der Praxis für die Praxis – wie die digitale Transformation das Lernen, die Kommunikation und die Zusammenarbeit in Organisationen beeinflusst
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Birgit Wolf and Andrea Ludwig
- Abstract
In diesem Kapitel zeigen die Autorinnen anhand der Erfahrungen aus verschiedenen Praxisprojekten im Rahmen von Veranderungsprozessen die Chancen aber auch die Herausforderungen auf, denen soziale Organisationen im Zuge der digitalen Transformation begegnen konnen. Dabei legen sie den Schwerpunkt auf die Themenbereiche Lernen und Entwicklung, Kommunikation, Wissensmanagement sowie Zusammenarbeit in Organisationen. In den vier beispielhaften Projekten konnen die Leser*innen nutzliche Praxistipps einerseits und den strategischen Aufbau von Projekten in Veranderungsprozessen andererseits betrachten.
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- 2021
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38. Praxistipps in Veränderungsprozessen
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Birgit Wolf and Andrea Ludwig
- Abstract
In diesem Kapitel mochten die Autorinnen die Leser*innen anhand von praktischen Tipps bei Veranderungsprozessen in Organisationen unterstutzen. Dabei nutzen sie die zusammengefassten Erkenntnisse aus den Kap. 4 und 5 und geben wichtige Tipps fur Veranderungsprozesse den Leser*innen an die Hand. Diese reichen von strategischen Voraussetzungen und Entscheidungen auf Seiten der Fuhrungsebene bis hin zu Instrumenten und Tools zur Integration und Motivation der Mitarbeiter*innen. Schlieslich wird anhand eines Coachingsprozesses gezeigt, welche Auswirkung das individuelle Lernen auf Veranderungsprozesse haben kann.
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- 2021
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39. Organization Of An Introductory Green Engineering Course For Engineering Undergraduates
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Barbara Utley, Andrea Ludwig, John Cundiff, and Sean McGinnis
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- 2020
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40. Toxic algal bloom induced by ocean acidification disrupts the pelagic food web
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Nicole Aberle-Malzahn, Maarten Boersma, Lennart T. Bach, Michael Sswat, Ulf Riebesell, Eric P. Achterberg, Wanchun Guan, Santiago Alvarez-Fernandez, Carsten Spisla, Mathias Haunost, Andrea Ludwig, Carolin R. Löscher, Maria Algueró-Muñiz, Jan Taucher, Paul Stange, Javier Arístegui, Tim Boxhammer, and Henriette G. Horn
- Subjects
0106 biological sciences ,010504 meteorology & atmospheric sciences ,Ecology ,010604 marine biology & hydrobiology ,fungi ,Ocean acidification ,Environmental Science (miscellaneous) ,Plankton ,01 natural sciences ,Algal bloom ,Ecosystem engineer ,Food web ,Phytoplankton ,Ecosystem ,Social Sciences (miscellaneous) ,0105 earth and related environmental sciences ,Trophic level - Abstract
Ocean acidification, the change in seawater carbonate chemistry due to the uptake of anthropogenic CO2, affects the physiology of marine organisms in multiple ways1. Diverse competitive and trophic interactions transform the metabolic responses to changes in community composition, seasonal succession and potentially geographical distribution of species. The health of ocean ecosystems depends on whether basic biotic functions are maintained, ecosystem engineers and keystone species are retained, and the spread of nuisance species is avoided2. Here, we show in a field experiment that the toxic microalga Vicicitus globosus has a selective advantage under ocean acidification, increasing its abundance in natural plankton communities at CO2 levels higher than 600 µatm and developing blooms above 800 µatm CO2. The mass development of V. globosus has had a dramatic impact on the plankton community, preventing the development of the micro- and mesozooplankton communities, thereby disrupting trophic transfer of primary produced organic matter. This has prolonged the residence of particulate matter in the water column and caused a strong decline in export flux. Considering its wide geographical distribution and confirmed role in fish kills3, the proliferation of V. globosus under the IPCC4 CO2 emission representative concentration pathway (RCP4.5 to RCP8.5) scenarios may pose an emergent threat to coastal communities, aquaculture and fisheries. Ocean acidification will result in biological winners and losers. A mesocosm experiment shows that a toxic algal species is a winner under ocean acidification, with implications for the marine food web and, more generally, ecosystem services.
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- 2018
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41. Veränderungsmanagement in der Sozialwirtschaft : Praxisorientierte Personal- und Organisationsentwicklung in unruhigen Zeiten des digitalen Wandels
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Andrea Ludwig, Birgit Wolf, Andrea Ludwig, and Birgit Wolf
- Subjects
- Public administration
- Abstract
Dieses Buch gibt Entscheider•innen und Praktiker•innen aus der Sozialwirtschaft einen praxisnahen Leitfaden für Digitalisierungsprojekte an die Hand. Die Autorinnen bieten mit ihrem Verständnis von Organisationskultur, das über das klassische betriebswirtschaftliche Wissen hinausgeht, passgenaue Empfehlungen für ein Veränderungsmanagement gerade für die menschenzentrierte Branche der Sozialwirtschaft. Sie betrachten die unausweichliche digitale Transformation aus dem Blickwinkel ihrer Auswirkung auf die Organisationskultur, die in der Sozialwirtschaft mit ihrer Kultur des Miteinanders einer der zentralen Erfolgsfaktoren ist. Ihnen ist ein praxisgerechter Leitfaden für Digitalisierungsprojekte für soziale Berufe gelungen, der berechtigte Berührungsängste abbaut und sogar Lust auf den Wandel macht. Durch die kompakte Darstellung der Wissensbasis sowie zahlreicher konkreter Tipps für die Umsetzung bekommen Praktiker•innen eine Schatzkiste für das Veränderungsmanagement in ihren Organisationen an die Hand!Aus dem InhaltRahmenbedingungen in der SozialwirtschaftOrganisationskultur und dessen BedeutungAus der Praxis: wie die digitale Transformation das Lernen, die Kommunikation und die Zusammenarbeit in Organisationen beeinflusstAuswirkung der Digitalisierung auf soziale OrganisationenPraxistipps in Veränderungsprozessen – von der Strategie über Lernprozesse bis zum Team-CoachingGastbeitrag von Dr. Gabriele Schambach: Diversity – ein „Must-Do“
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- 2021
42. Identification of airway mucosal type 2 inflammation by using clinical biomarkers in asthmatic patients
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J. Mark FitzGerald, Richard Leigh, Joel N. Kline, Stephen Lam, Matthew J. Loza, Andreas Eich, Frédéric Baribaud, Patrick Berger, P. Chanez, Philip E. Silkoff, Dave Singh, Vedrana S. Susulic, Steven G. Kelsen, Elliot S. Barnathan, Michel Laviolette, Azra Hussaini, Irina Strambu, William J. Calhoun, Andrea Ludwig-Sengpiel, Geoffrey Chupp, Mark T. Dransfield, Vibeke Backer, Pierre Olivier Girodet, and Celeste Porsbjerg
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Adult ,Male ,0301 basic medicine ,Adolescent ,Immunology ,Gene Expression ,Inflammation ,Respiratory Mucosa ,Periostin ,Nitric Oxide ,Severity of Illness Index ,Cell Line ,Leukocyte Count ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Humans ,Immunology and Allergy ,CCL17 ,Medicine ,Asthma ,Interleukin-13 ,Chemokine CCL26 ,business.industry ,Middle Aged ,respiratory system ,medicine.disease ,Respiratory Function Tests ,respiratory tract diseases ,Eosinophils ,030104 developmental biology ,030228 respiratory system ,Chemokines, CC ,Exhaled nitric oxide ,Population study ,Female ,Chemokine CCL17 ,CCL26 ,medicine.symptom ,business ,Airway ,Cell Adhesion Molecules ,Biomarkers - Abstract
Background The Airways Disease Endotyping for Personalized Therapeutics (ADEPT) study profiled patients with mild, moderate, and severe asthma and nonatopic healthy control subjects. Objective We explored this data set to define type 2 inflammation based on airway mucosal IL-13–driven gene expression and how this related to clinically accessible biomarkers. Methods IL-13–driven gene expression was evaluated in several human cell lines. We then defined type 2 status in 25 healthy subjects, 28 patients with mild asthma, 29 patients with moderate asthma, and 26 patients with severe asthma based on airway mucosal expression of (1) CCL26 (the most differentially expressed gene), (2) periostin, or (3) a multigene IL-13 in vitro signature (IVS). Clinically accessible biomarkers included fraction of exhaled nitric oxide (Feno) values, blood eosinophil (bEOS) counts, serum CCL26 expression, and serum CCL17 expression. Results Expression of airway mucosal CCL26, periostin, and IL-13–IVS all facilitated segregation of subjects into type 2–high and type 2–low asthmatic groups, but in the ADEPT study population CCL26 expression was optimal. All subjects with high airway mucosal CCL26 expression and moderate-to-severe asthma had Feno values (≥35 ppb) and/or high bEOS counts (≥300 cells/mm 3 ) compared with a minority (36%) of subjects with low airway mucosal CCL26 expression. A combination of Feno values, bEOS counts, and serum CCL17 and CCL26 expression had 100% positive predictive value and 87% negative predictive value for airway mucosal CCL26–high status. Clinical variables did not differ between subjects with type 2–high and type 2–low status. Eosinophilic inflammation was associated with but not limited to airway mucosal type 2 gene expression. Conclusion A panel of clinical biomarkers accurately classified type 2 status based on airway mucosal CCL26, periostin, or IL-13–IVS gene expression. Use of Feno values, bEOS counts, and serum marker levels (eg, CCL26 and CCL17) in combination might allow patient selection for novel type 2 therapeutics.
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- 2017
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43. FULFIL Trial: Once-Daily Triple Therapy for Patients with Chronic Obstructive Pulmonary Disease
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David A. Lomas, Nicholas Locantore, Steven Pascoe, Andrea Ludwig-Sengpiel, Noushin Brealey, David A. Lipson, Ruby Birk, Chang-Qing Zhu, Helen Barnacle, Maggie Tabberer, and Rajat Mohindra
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Pulmonary and Respiratory Medicine ,Budesonide ,medicine.medical_specialty ,COPD ,medicine.drug_class ,business.industry ,Inhaler ,Pulmonary disease ,Critical Care and Intensive Care Medicine ,medicine.disease ,Fluticasone propionate ,Surgery ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,030228 respiratory system ,chemistry ,Internal medicine ,medicine ,Corticosteroid ,030212 general & internal medicine ,Vilanterol ,Formoterol ,business ,medicine.drug - Abstract
Rationale: Randomized data comparing triple therapy with dual inhaled corticosteroid (ICS)/long-acting β2-agonist (LABA) therapy in patients with chronic obstructive pulmonary disease (COPD) are limited.Objectives: We compared the effects of once-daily triple therapy on lung function and health-related quality of life with twice-daily ICS/LABA therapy in patients with COPD.Methods: The FULFIL (Lung Function and Quality of Life Assessment in Chronic Obstructive Pulmonary Disease with Closed Triple Therapy) trial was a randomized, double-blind, double-dummy study comparing 24 weeks of once-daily triple therapy (fluticasone furoate/umeclidinium/vilanterol 100 μg/62.5 μg/25 μg; ELLIPTA inhaler) with twice-daily ICS/LABA therapy (budesonide/formoterol 400 μg/12 μg; Turbuhaler). A patient subgroup remained on blinded treatment for up to 52 weeks. Co–primary endpoints were change from baseline in trough FEV1 and in St. George’s Respiratory Questionnaire (SGRQ) total score at Week 24.Measurements and Main Results...
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- 2017
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44. A connected inhaler system improves adherence to fluticasone furoate/vilanterol in asthma
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Jamie Rees, Raj Sharma, Neil Barnes, Alison Moore, Robert A. Wise, Richard W. Costello, Giselle Mosnaim, Andrea Ludwig-Sengpiel, Liam G Heaney, Ryan Tomlinson, Ruth Tal-Singer, and A. Preece
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medicine.medical_specialty ,business.industry ,Inhaler ,Internal medicine ,medicine ,medicine.disease ,business ,Fluticasone furoate/vilanterol ,Asthma - Published
- 2020
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45. Factors controlling plankton productivity, particulate matter stoichiometry, and export fluxin the coastal upwelling system off Peru
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Carsten Spisla, Mathias Haunost, Nauzet Hernández-Hernández, Mabel Zavala Moreira, Alba Filella, Jesus Ledesma, Eric P. Achterberg, Jonna Piiparinen, Tim Boxhammer, Anne Sophie Boegeholz, Francisco P. Chavez, Christian Lieberum, Paulina Aguayo, Javier Arístegui, Jana Meyer, Patricia Grasse, Avy Bernales, Allanah J. Paul, Fabrizio Minutolo, Sonia Sánchez, Leila Kittu, Ulf Riebesell, Mark J. Hopwood, Michael Sswat, Joaquin Ortiz Cortes, Elisabeth von der Esch, Michelle Graco, Ursula Mendoza, Judith Meyer, Andrea Ludwig, Maricarmen Igarza, Verena Kalter, Martin A. Fischer, Isabel Baños, Claudia Sforna, Patrizia Ayon, Carolin Loescher, Peter Kohnert, Shao-Min Chen, Lennart T. Bach, Kristian Spilling, Kristin Doering, Silke Lischka, Kai G. Schulz, and Jan Hennke
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Biogeochemical cycle ,Oceanography ,Water column ,biology ,Phytoplankton ,Akashiwo sanguinea ,Environmental science ,Upwelling ,Dominance (ecology) ,Plankton ,biology.organism_classification ,Mesocosm - Abstract
Eastern boundary upwelling systems (EBUS) are among the most productive marine ecosystems on Earth. The high productivity in surface waters is facilitated by upwelling of nutrient-rich deep waters, with high light availability enabling fast phytoplankton growth and nutrient utilization. However, there are numerous biotic and abiotic factors modifying productivity and biogeochemical processes. Determining these factors is important because EBUS are considered hotspots of climate change, and reliable predictions on their future functioning requires understanding of the mechanisms driving biogeochemical cycles therein. In this study, we used in situ mesocosms to obtain mechanistic understanding of processes controlling productivity, organic matter export, and particulate matter stoichiometry in the coastal Peruvian upwelling system. Therefore, eight mesocosm units with a volume of ~50 m3 were deployed for 50 days ~6 km off Callao during austral summer 2017, coinciding with a coastal El Niño event. To compare how upwelling of different water bodies influences plankton succession patterns, we collected two subsurface waters at different locations in the regional oxygen minimum zone (OMZ) and injected these into four replicate mesocosms, respectively (mixing ratio ≈ 1.5:1 mesocosm: OMZ water). The differences in nutrient concentrations between the collected water bodies were relatively small, and therefore we do not consider treatment differences in the present paper. The phytoplankton communities were initially dominated by diatoms but shifted towards a pronounced dominance of the mixotrophic harmful dinoflagellate (Akashiwo sanguinea) when inorganic nitrogen was exhausted in surface layers. The community shift resulted in a major short-term increase in productivity during A. sanguinea growth which left a pronounced imprint on organic matter C:N:P stoichiometry. However, C, N, and P export fluxes were not affected by this ecological regime shift because A. sanguinea persisted in the water column and did not sink out during the experiment. Accordingly, ongoing export fluxes during the study were maintained mainly by a remaining “background” plankton community. Overall, biogeochemical pools and fluxes were surprisingly constant in between the ecological regime shifts. We explain this constancy by light limitation through self-shading by phytoplankton and inorganic nitrogen limitation which constrained phytoplankton growth. Thus, gain and loss processes seemed to be relatively well balanced and there was little opportunity for blooms, which represents an event where the system becomes unbalanced. The mesocosm study revealed key links between ecological and biogeochemical processes for one of the economically most important regions in the oceans.
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- 2020
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46. Supplementary material to 'Factors controlling plankton productivity, particulate matter stoichiometry, and export fluxin the coastal upwelling system off Peru'
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Lennart Thomas Bach, Allanah Joy Paul, Tim Boxhammer, Elisabeth von der Esch, Michelle Graco, Kai Georg Schulz, Eric Achterberg, Paulina Aguayo, Javier Aristegui, Patrizia Ayon, Isabel Banos, Avy Bernales, Anne Sophie Boegeholz, Francisco Chavez, Shao-Min Chen, Kristin Doering, Alba Filella, Martin Fischer, Patricia Grasse, Mathias Haunost, Jan Hennke, Nauzet Hernandez-Hernandez, Mark Hopwood, Maricarmen Igarza, Verena Kalter, Leila Kittu, Peter Kohnert, Jesus Ledesma, Christian Lieberum, Silke Lischka, Carolin Loescher, Andrea Ludwig, Ursula Mendoza, Jana Meyer, Judith Meyer, Fabrizio Minutolo, Joaquin Ortiz Cortes, Jonna Piiparinen, Claudia Sforna, Kristian Spilling, Sonia Sanchez, Carsten Spisla, Michael Sswat, Mabel Zavala Moreira, and Ulf Riebesell
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- 2020
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47. Iron and Lipocalin-2 Modulate Cellular Responses in the Tumor Micro-environment of Pancreatic Ductal Adenocarcinoma
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Maciej Pietrzak, Andrea Ludwig, Madelyn Traczek, Zobeida Cruz-Monserrate, Rosa F. Hwang, Amy Webb, Olivia Ueltschi, Xiaokui Mo, Valentina Pita-Grisanti, Niharika Badi, Kristyn Gumpper, and Andrew W. Dangel
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endocrine system diseases ,Chemistry ,Cell growth ,Cell migration ,Lipocalin ,medicine.disease ,digestive system diseases ,Metastasis ,Extracellular matrix ,Cancer research ,Hepatic stellate cell ,medicine ,Receptor ,Gene - Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a highly metastatic disease with poor outcomes. Iron is known to signal cellular responses, and its levels are regulated by lipocalin-2 (LCN2) expression, a PDAC pro-tumorigenic molecule. However, how iron and LCN2 function in PDAC is unclear. Here we demonstrate that iron levels regulate PDAC cell proliferation, invasion, expression of epithelial to mesenchymal tumor markers, and pro-inflammatory cytokines. Iron chelation increased the expression of the LCN2 receptorSLC22A17in pancreatic stellate cells and the anti-metastatic geneNDRG1in PDAC cells. Deletion ofLcn2in mouse tumor cells modulated the expression of genes involved in extracellular matrix deposition and cell migration. Moreover, cellular iron responses were dependent on theKrasmutation status of cells, andLCN2expression levels. Deletion ofLcn2expression in PDAC suggests a protective role against metastasis. Thus, iron modulation and LCN2 blockade could serve as potential therapeutic approaches against PDAC.
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- 2020
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48. Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels
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Lennart T. Bach, Mayte Tames-Espinosa, Jan Taucher, Josep Coca, Ulf Riebesell, Henriette G. Horn, Andrea Ludwig, Theodore T. Packard, Maria Algueró-Muñiz, Ico Martínez, May Gómez, and Vanesa Romero-Kutzner
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0106 biological sciences ,Chlorophyll a ,lcsh:QH1-199.5 ,010504 meteorology & atmospheric sciences ,Heterotroph ,ocean acidification ,Ocean Engineering ,plankton metabolism ,lcsh:General. Including nature conservation, geographical distribution ,Aquatic Science ,Oceanography ,01 natural sciences ,Mesocosm ,chemistry.chemical_compound ,Water column ,Animal science ,Phytoplankton ,Dominance (ecology) ,14. Life underwater ,lcsh:Science ,potential respiration ,0105 earth and related environmental sciences ,Water Science and Technology ,Global and Planetary Change ,010604 marine biology & hydrobiology ,nutrient fertilization ,Plankton ,chemistry ,13. Climate action ,Upwelling ,lcsh:Q ,mesocosms ,subtropical North-Atlantic - Abstract
In the autumn of 2014, nine large mesocosms were deployed in the oligotrophic subtropical North-Atlantic coastal waters off Gran Canaria (Spain). Their deployment was designed to address the acidification effects of CO2 levels from 400 to 1,400 mu atm, on a plankton community experiencing upwelling of nutrient-rich deep water. Among other parameters, chlorophyll a (chl-a), potential respiration (Phi), and biomass in terms of particulate protein (B) were measured in the microplankton community (0.7-50.0 mu m) during an oligotrophic phase (Phase I), a phytoplankton-bloom phase (Phase II), and a post-bloom phase (Phase III). Here, we explore the use of the Phi/chl-a ratio in monitoring shifts in the microplankton community composition and its metabolism. Phi/chl-a values below 2.5 mu L O-2 h(-1) (mu g chl-a)(-1) indicated a community dominated by photoautotrophs. When Phi/chl-a ranged higher, between 2.5 and 7.0 mu L O-2 h(-1) (pg chl-a)(-1) , it indicated a mixed community of phytoplankton, microzooplankton and heterotrophic prokaryotes. When Phi/chl-a rose above 7.0 mu L O-2 h(-1) (mu g chl-a)(-1), it indicated a community where microzooplankton proliferated (>10.0 mu L O-2 h(-1) (mu g chl-a)(-1)), because heterotrophic dinoflagellates bloomed. The first derivative of B, as a function of time (dB/dt), indicates the rate of protein build-up when positive and the rate of protein loss, when negative. It revealed that the maximum increase in particulate protein (biomass) occurred between 1 and 2 days before the chl-a peak. A day after this peak, the trough revealed the maximum net biomass loss. This analysis did not detect significant changes in particulate protein, neither in Phase I nor in Phase III. Integral analysis of Phi/chl-a and B, over the duration of each phase, for each mesocosm, reflected a positive relationship between 4) and pCO(2) during Phase II [alpha = 230.10-5 mu L O-2 h(-1) L-1 (patm CO2)(-1) (phase-day)(-1), R-2 = 0.30] and between chl-a and pCO(2) during Phase III [alpha = 100.10(-5) Ag chl-a L-1 (mu atmCO(2))(-1) (phase-day)(-1), R-2 = 0.84]. At the end of Phase II, a harmful algal species (HAS), Vicicitus globosus, bloomed in the high pCO(2) mesocosms. In these mesocosms, microzooplankton did not proliferate, and chl-a retention time in the water column increased. In these V globosus-disrupted communities, the (Phi/chl-a ratio [4.1 +/- 1.5 /mu L O-2 h(-1) (mu g chl-a)(-1)] was more similar to the Phi/chl-a ratio in a mixed plankton community than to a photoautotroph-dominated one.
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- 2020
49. Late Breaking Abstract - A connected inhaler system improves adherence to fluticasone furoate/vilanterol in asthma
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Ryan Tomlinson, Andrea Ludwig-Sengpiel, Liam G Heaney, Raj Sharma, Robert A. Wise, Andrew Preece, Giselle Mosnaim, Alison Moore, Neil Barnes, Richard W. Costello, Jamie Rees, and Ruth Tal-Singer
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medicine.medical_specialty ,business.industry ,Inhaler ,medicine.disease ,Fluticasone furoate/vilanterol ,03 medical and health sciences ,0302 clinical medicine ,030228 respiratory system ,Maintenance therapy ,Asthma control ,Internal medicine ,Clinical endpoint ,Medicine ,Asthmatic patient ,030212 general & internal medicine ,business ,Asthma Control Test ,Asthma - Abstract
Background: Poor adherence is a key factor in poor asthma control. A connected inhaler system (CIS) comprising sensors on inhalers, a patient-facing app, and a Healthcare Professional (HCP) dashboard could improve asthma management by improving adherence. Methods: Study 207040 (NCT033800429) is one of the first to investigate the different elements of a CIS in improving adherence. The study had a 24-week, open-label, randomised, multi-centre, parallel group design with 5 treatment arms, in uncontrolled asthmatic patients [Asthma Control Test (ACT) Results: The primary endpoint was the effect of 6 months’ use of a CIS on adherence to maintenance therapy assessed over months 4-6, with the absolute adjusted mean adherence difference in arm 1 (data on maintenance to participant and HCP; 82.0%) being 13.2% (95% CI [6.3%, 20.0%]; p Conclusion: The study demonstrates that a CIS can improve adherence to maintenance medication for patients with uncontrolled asthma. Funding: GlaxoSmithKline plc. (207040)
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- 2019
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50. Anticipated responses to a hypothetical minimum price for cigarettes and roll-your-own tobacco: an online cross-sectional survey with cigarette smokers and ex-smokers in the UK
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James Crapo, Abhya Gupta, Robert M Mroz, Andrea Ludwig-Sengpiel, Markus Beck, Bérengère Langellier, Carina Ittrich, and Frank Risse
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Adult ,medicine.medical_specialty ,Cross-sectional study ,Outcome measurements ,medicine.medical_treatment ,030508 substance abuse ,Electronic Nicotine Delivery Systems ,03 medical and health sciences ,0302 clinical medicine ,Minimum price ,Tobacco ,medicine ,health economics ,Humans ,030212 general & internal medicine ,Smoke ,Smokers ,business.industry ,Public health ,Tobacco control ,Commerce ,Ex smokers ,health policy ,Tobacco Products ,General Medicine ,Taxes ,United Kingdom ,Cross-Sectional Studies ,behavior and behavior mechanisms ,Medicine ,Smoking cessation ,Public Health ,Ex-Smokers ,0305 other medical science ,business ,Demography - Abstract
ObjectivesAs tobacco companies can circumvent tax increases, a minimum retail price per-cigarette/per-gram of roll-your-own tobacco presents an additional mechanism for governments to reduce smoking. We examined (1) anticipated responses to a hypothetical minimum price-per-cigarette/per-gram among smokers in the UK; (2) what demographic and smoker characteristics are associated with anticipated responses; and (3) whether minimum pricing may help ex-smokers stay quit.DesignCross-sectional survey (May–July 2019).SettingUK.ParticipantsAdult cigarette smokers (n=2412) and ex-smokers (n=700).Main outcome measurementsAnticipated responses to a hypothetical minimum price of £10.00 for 20 cigarettes (£0.50 per-cigarette) and £13.50 for 30 grams of roll-your-own tobacco (£0.45 per-gram); approximately £0.10 per-cigarette/per-gram increases on the cheapest prices in leading UK supermarkets (January 2019). Smokers were presented with ten options (eg, ‘Try to quit’) and asked which they would do (Yes/No) and then which they would most likely do. Ex-smokers were asked to what extent the minimum prices would help them stay quit (A lot vs Lesser agreement).ResultsAmong smokers, 55.6% said they would most likely smoke the same amount, 10.7% they would smoke less, 9.5% they would try to quit and 5.8% they would use e-cigarettes more often. Anticipated reactions were associated with demography and smoker characteristics, for example, C2DE (lower social grade) smokers were less likely than ABC1 (higher social grade) smokers to say they would smoke the same as they do now (ORAdj=0.74, 95% CI 0.62 to 0.88). Among ex-smokers, 38.5% said the minimum prices would help them stay quit ‘A lot’, more so among C2DE than ABC1 participants (ORAdj=1.80, 95% CI 1.30 to 2.49).ConclusionsIn response to a hypothetical minimum price for cigarettes and roll-your-own tobacco, approximately a fifth of smokers in the UK indicated they would smoke less or quit and almost two-fifths of ex-smokers indicated the prices would help them stay quit.
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- 2021
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