618 results on '"L Hoang"'
Search Results
2. PELVIC FLOOR EXAM & TRIGGER POINT INJECTIONS: A CADAVERIC AND ANIMATED DEMONSTRATION
- Author
-
J Booher, C Shenhar, L Hoang Roberts, E Slopnick, and L Gleich
- Subjects
Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2023
- Full Text
- View/download PDF
3. PROGRESSION OF OVERACTIVE BLADDER SYMPTOMS IN PATIENTS WITH PRIOR SARS-COV-2 INFECTION
- Author
-
P Padmanabhan, B Zwaans, and L Hoang-Roberts
- Subjects
Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2023
- Full Text
- View/download PDF
4. NOVEL PUDENDAL NEUROMODULATION TECHNIQUE USING ANATOMICAL LANDMARKS
- Author
-
L Hoang Roberts, C Shenhar, J Booher, L Gleich, K Peters, and M Tracy Bee
- Subjects
Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2023
- Full Text
- View/download PDF
5. 298 THE INCIDENCE OF NEW OR WORSENING OAB SYMPTOMS IN PATIENTS WITH PRIOR SARS COV-2 INFECTION: A COHORT STUDY
- Author
-
L Hoang Roberts, B Zwaans, K Peters, M Chancellor, and P Padmanabhan
- Subjects
Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2022
- Full Text
- View/download PDF
6. Experimental Investigation of the Effects of Process Parameters on Cutting Force in External Cylindrical Grinding
- Author
-
T.-L. Nguyen, V.T. Thai, and L. Hoang
- Subjects
surface roughness ,cutting force ,cylindrical grinding ,mathematical model ,alloy steel ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
Cutting force is a vital parameter that affects product quality. Proper control of the cutting force helps optimize the production process as it improves productivity and product quality. This paper assesses the influence of machining parameters, such as alloy steel hardness and workpiece diameters, to cutting forces when external cylindrical grinding by experimental methods. The cutting force was measured using a workpiece shaft-mounted sensor with a balanced bridge-type resistor sensor. Steel for testing: 40Cr, 9CrSi, 65Mn, and W18Cr4V, which were heat-treated at three different hardness levels: 40, 50, and 60 HRC. The Taguchi method's experimental results show that the main parameters affecting cutting forces are: Feed rate of the grinding wheel Sd, cutting depth t, and hardness of workpiece material on the HRC scale. Since then, we built a mathematical model of the normal cutting force function Fn and tangent cutting force function Ft according to Sd, t, and HRC of 9CrSi steel then tested again with three steel types: 40Cr, 65Mn, and W18Cr4V for quite similar results. The cutting force is controlled through cutting parameters suitable for different hardness and workpiece material based on this model.
- Published
- 2021
- Full Text
- View/download PDF
7. Association with a novel protective microbe facilitates host adaptation to a stressful environment
- Author
-
Kim L. Hoang, Nicole M. Gerardo, and Levi T. Morran
- Subjects
Experimental evolution ,host adaptation ,protective microbes ,Evolution ,QH359-425 - Abstract
Abstract Protective symbionts can allow hosts to occupy otherwise uninhabitable niches. Despite the importance of symbionts in host evolution, we know little about how these associations arise. Encountering a microbe that can improve host fitness in a stressful environment may favor persistent interactions with that microbe, potentially facilitating a long‐term association. The bacterium Bacillus subtilis protects Caenorhabditis elegans nematodes from heat shock by increasing host fecundity compared to the nonprotective Escherichia coli. In this study, we ask how the protection provided by the bacterium affects the host's evolutionary trajectory. Because of the stark fitness contrast between hosts heat shocked on B. subtilis versus E. coli, we tested whether the protection conferred by the bacteria could increase the rate of host adaptation to a stressful environment. We passaged nematodes on B. subtilis or E. coli, under heat stress or standard conditions for 20 host generations of selection. When assayed under heat stress, we found that hosts exhibited the greatest fitness increase when evolved with B. subtilis under stress compared to when evolved with E. coli or under standard (nonstressful) conditions. Furthermore, despite not directly selecting for increased B. subtilis fitness, we found that hosts evolved to harbor more B. subtilis as they adapted to heat stress. Our findings demonstrate that the context under which hosts evolve is important for the evolution of beneficial associations and that protective microbes can facilitate host adaptation to stress. In turn, such host adaptation can benefit the microbe.
- Published
- 2021
- Full Text
- View/download PDF
8. Evaluation of Hemodynamic Alterations after Flow Diverter Placement using the AneurysmFlowTM tool.
- Author
-
Luu, V. Dang, Bach, T. Xuan, An, N. Huu, Anh, N. Quang, Tuan, T. Anh, Kien, L. Hoang, Thien, N. Tat, Trang, N. Thu, and Cuong, T.
- Subjects
HEMODYNAMICS ,ANEURYSMS ,RADIOLOGY ,FLOW velocity - Abstract
Background. AneurysmFlow (Phillips Healthcare) is the flow measurement tool, utilizing an optical flow-based algorithm from DSA, lacks sufficient published studies. This study aimed to assess the significance of flow velocity changes and the Mean Aneurysm Flow Amplitude (MAFA) ratio in evaluating outcomes following flow-diverting treatments. Methods. Between June 2021 and October 2022, 41 patients with 42 aneurysms underwent FDS treatment with AneurysmFlow measurement at the Bach Mai Radiology Center. Results. The tool achieved a 90.5% success rate in 38 out of 42 patients. Most aneurysms (89.5%) were small to medium-sized (<10 mm), and a decrease in flow velocity post-stent deployment was observed in 78.9% of cases. Conversely, 21.1% showed increased flow, mainly in aneurysms smaller than 5 mm. No significant association was found between flow changes or MAFA ratio and aneurysm size characteristics. Twenty-two patients (59.5%) underwent re-examination at 6 months, revealing no correlation in MAFA ratio between completely and incompletely occluded aneurysms. Conclusions. Our current investigation, primarily centered on small and medium-sized aneurysms, did not uncover any link between quantitative flow changes assessed using the AneurysmFlow software and the occlusion status of aneurysms at the 6-month follow-up post-flow diverter treatment. Larger case series with extended follow-up imaging are necessary to further explore these findings. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
9. Efficacy and safety of antimicrobial stewardship prospective audit and feedback in patients hospitalized with COVID-19: A protocol for a pragmatic clinical trial.
- Author
-
Justin Z Chen, Holly L Hoang, Maryna Yaskina, Dima Kabbani, Karen E Doucette, Stephanie W Smith, Cecilia Lau, Jackson Stewart, Karen Zurek, Morgan Schultz, and Carlos Cervera
- Subjects
Medicine ,Science - Abstract
BackgroundThe use of broad-spectrum antibiotics is widespread in patients with COVID-19 despite a low prevalence of bacterial co-infection, raising concerns for the accelerated development of antimicrobial resistance. Antimicrobial stewardship (AMS) is vital but there are limited randomized clinical trial data supporting AMS interventions such as prospective audit and feedback (PAF). High quality data to demonstrate safety and efficacy of AMS PAF in hospitalized COVID-19 patients are needed.Methods and designThis is a prospective, multi-center, non-inferiority, pragmatic randomized clinical trial evaluating AMS PAF intervention plus standard of care (SOC) versus SOC alone. We include patients with microbiologically confirmed SARS-CoV-2 infection requiring hospital admission for severe COVID-19 pneumonia. Eligible ward beds and critical care unit beds will be randomized prior to study commencement at each participating site by computer-generated allocation sequence stratified by intensive care unit versus conventional ward in a 1:1 fashion. PAF intervention consists of real time review of antibacterial prescriptions and immediate written and verbal feedback to attending teams, performed by site-based AMS teams comprised of an AMS pharmacist and physician. The primary outcome is clinical status at post-admission day 15 measured using a 7-point ordinal scale. Patients will be followed for secondary outcomes out to 30 days. A total of 530 patients are needed to show a statistically significant non-inferiority, with 80% power and 2.5% one-sided alpha assuming standard deviation of 2 and the non-inferiority margin of 0.5.DiscussionThis study protocol presents a pragmatic clinical trial design with small unit cluster randomization for AMS intervention in hospitalized COVID-19 that will provide high-level evidence and may be adopted in other clinical situations.Trial registrationThis study is being performed at the University of Alberta and is registered at ClinicalTrials.gov (NCT04896866) on May 17, 2021.
- Published
- 2022
- Full Text
- View/download PDF
10. Efficacy and safety of antimicrobial stewardship prospective audit and feedback in patients hospitalised with COVID-19 (COVASP): a pragmatic, cluster-randomised, non-inferiority trial
- Author
-
Justin Z Chen, Holly L Hoang, Maryna Yaskina, Dima Kabbani, Karen E Doucette, Stephanie W Smith, Cecilia Lau, Jackson Stewart, Shahileen Remtulla, Karen Zurek, Morgan Schultz, Hiromi Koriyama-McKenzie, and Carlos Cervera
- Subjects
Infectious Diseases - Published
- 2023
11. The effects of Bacillus subtilis on Caenorhabditis elegans fitness after heat stress
- Author
-
Kim L. Hoang, Nicole M. Gerardo, and Levi T. Morran
- Subjects
beneficial microbes ,context‐dependency ,environmental stress ,host–microbe association ,Ecology ,QH540-549.5 - Abstract
Abstract Microbes can provide their hosts with protection from biotic and abiotic factors. While many studies have examined how certain bacteria can increase host lifespan, fewer studies have examined how host reproduction can be altered. The nematode Caenorhabditis elegans has been a particularly useful model system to examine how bacteria affect the fitness of their hosts under different contexts. Here, we examine how the bacterium Bacillus subtilis, compared to the standard C. elegans lab diet, Escherichia coli, affects C. elegans survival and reproduction after experiencing a period of intense heat stress. We find that under standard conditions, nematodes reared on B. subtilis produce fewer offspring than when reared on E. coli.However, despite greater mortality rates on B. subtilis after heat shock, young adult nematodes produced more offspring after heat shock when fed B. subtilis compared to E. coli. Because offspring production is necessary for host population growth and evolution, the reproductive advantage conferred by B. subtilis supersedes the survival advantage of E. coli. Furthermore, we found that nematodes must be reared on B. subtilis (particularly at the early stages of development) and not merely be exposed to the bacterium during heat shock, to obtain the reproductive benefits provided by B. subtilis. Taken together, our findings lend insight into the importance of environmental context and interaction timing in shaping the protective benefits conferred by a microbe toward its host.
- Published
- 2019
- Full Text
- View/download PDF
12. The effect of input data resolution and complexity on the uncertainty of hydrological predictions in a humid vegetated watershed
- Author
-
L. Hoang, R. Mukundan, K. E. B. Moore, E. M. Owens, and T. S. Steenhuis
- Subjects
Technology ,Environmental technology. Sanitary engineering ,TD1-1066 ,Geography. Anthropology. Recreation ,Environmental sciences ,GE1-350 - Abstract
Uncertainty in hydrological modeling is of significant concern due to its effects on prediction and subsequent application in watershed management. Similar to other distributed hydrological models, model uncertainty is an issue in applying the Soil and Water Assessment Tool (SWAT). Previous research has shown how SWAT predictions are affected by uncertainty in parameter estimation and input data resolution. Nevertheless, little information is available on how parameter uncertainty and output uncertainty are affected by input data of varying complexity. In this study, SWAT-Hillslope (SWAT-HS), a modified version of SWAT capable of predicting saturation-excess runoff, was applied to assess the effects of input data with varying degrees of complexity on parameter uncertainty and output uncertainty. Four digital elevation model (DEM) resolutions (1, 3, 10 and 30 m) were tested for their ability to predict streamflow and saturated areas. In a second analysis, three soil maps and three land use maps were used to build nine SWAT-HS setups from simple to complex (fewer to more soil types/land use classes), which were then compared to study the effect of input data complexity on model prediction/output uncertainty. The case study was the Town Brook watershed in the upper reaches of the West Branch Delaware River in the Catskill region, New York, USA. Results show that DEM resolution did not impact parameter uncertainty or affect the simulation of streamflow at the watershed outlet but significantly affected the spatial pattern of saturated areas, with 10m being the most appropriate grid size to use for our application. The comparison of nine model setups revealed that input data complexity did not affect parameter uncertainty. Model setups using intermediate soil/land use specifications were slightly better than the ones using simple information, while the most complex setup did not show any improvement from the intermediate ones. We conclude that improving input resolution and complexity may not necessarily improve model performance or reduce parameter and output uncertainty, but using multiple temporal and spatial observations can aid in finding the appropriate parameter sets and in reducing prediction/output uncertainty.
- Published
- 2018
- Full Text
- View/download PDF
13. Exploring team collective voice: the case of software development teams in Vietnam
- Author
-
An L. Hoang, Anh T.T. Phan, Dam X. Dong, Trang T.H. Tran, and Chinh T. Nguyen
- Subjects
Organizational Behavior and Human Resource Management ,Public Administration ,Applied Psychology - Abstract
PurposeThe team voice (TV) concept has been largely understudied, with different definitions and understandings among prior research creating confusion for readers and future researchers. This study proposes a unified definition and connotation of TV that captures TV's collective meaning and highlights TV's vital role in Eastern contexts.Design/methodology/approachThis study applied the constructivist grounded theory (CGT) methodology to collect and analyze qualitative data from Vietnam software companies. A total of 32 software development managers and employees were interviewed regarding TV behavior of the managers and employees.FindingsThe findings emphasize that TV should not be understood as team members' average or aggregate voice. Rather, TV should be understood as the shared voice of team members toward higher management, other teams or individuals in the organization in an attempt to challenge/change the status quo [team collective voice (TCV)]. The findings also reveal the characteristics of TCV (purpose, voicing and consensus mechanisms), TCV's different types and important roles in the context of an Eastern country operating under weak institutions.Originality/valueThis exploratory study was able to clarify different connotations of employee voice at the team level, which helps raise awareness among scholars on the collective nature of TV and guides successive researchers away from inconsistent understandings of the term. The study also reveals certain institutional conditions that foster this type of voice and suggests the employee voice concept should not be examined independently from the concept's institutional context. The proposed typology contributes comprehensively to this conceptual work of TCV as the topology reveals the concept's multidimensionality and aids future research on measurement construction.
- Published
- 2023
14. High-plex imaging of RNA and proteins at subcellular resolution in fixed tissue by spatial molecular imaging
- Author
-
Shanshan He, Ruchir Bhatt, Carl Brown, Emily A. Brown, Derek L. Buhr, Kan Chantranuvatana, Patrick Danaher, Dwayne Dunaway, Ryan G. Garrison, Gary Geiss, Mark T. Gregory, Margaret L. Hoang, Rustem Khafizov, Emily E. Killingbeck, Dae Kim, Tae Kyung Kim, Youngmi Kim, Andrew Klock, Mithra Korukonda, Alecksandr Kutchma, Zachary R. Lewis, Yan Liang, Jeffrey S. Nelson, Giang T. Ong, Evan P. Perillo, Joseph C. Phan, Tien Phan-Everson, Erin Piazza, Tushar Rane, Zachary Reitz, Michael Rhodes, Alyssa Rosenbloom, David Ross, Hiromi Sato, Aster W. Wardhani, Corey A. Williams-Wietzikoski, Lidan Wu, and Joseph M. Beechem
- Subjects
Biomedical Engineering ,Molecular Medicine ,Bioengineering ,Applied Microbiology and Biotechnology ,Biotechnology - Abstract
Resolving the spatial distribution of RNA and protein in tissues at subcellular resolution is a challenge in the field of spatial biology. We describe spatial molecular imaging, a system that measures RNAs and proteins in intact biological samples at subcellular resolution by performing multiple cycles of nucleic acid hybridization of fluorescent molecular barcodes. We demonstrate that spatial molecular imaging has high sensitivity (one or two copies per cell) and very low error rate (0.0092 false calls per cell) and background (~0.04 counts per cell). The imaging system generates three-dimensional, super-resolution localization of analytes at ~2 million cells per sample. Cell segmentation is morphology based using antibodies, compatible with formalin-fixed, paraffin-embedded samples. We measured multiomic data (980 RNAs and 108 proteins) at subcellular resolution in formalin-fixed, paraffin-embedded tissues (nonsmall cell lung and breast cancer) and identified18 distinct cell types, ten unique tumor microenvironments and 100 pairwise ligand-receptor interactions. Data on800,000 single cells and ~260 million transcripts can be accessed at http://nanostring.com/CosMx-dataset .
- Published
- 2022
15. Efficient synthesis of celecoxib and pyrazole derivatives on heterogeneous Ga-MCM-41-SO3H catalyst under mild condition
- Author
-
Tran Quang-Hung, Tu T. Do, Viet Q. Hoang, Duc M. Tran, Ngo Quoc-Anh, Tuan-Anh L. Hoang, Reinhard Eckelt, Dang V. Do, Tuan T. Dang, and Xuan-Hoan Vu
- Subjects
General Chemical Engineering ,Materials Chemistry ,General Chemistry ,Biochemistry ,Industrial and Manufacturing Engineering - Published
- 2022
16. Best Practices for Spatial Profiling for Breast Cancer Research with the GeoMx® Digital Spatial Profiler
- Author
-
Helga Bergholtz, Jodi M. Carter, Alessandra Cesano, Maggie Chon U Cheang, Sarah E. Church, Prajan Divakar, Christopher A. Fuhrman, Shom Goel, Jingjing Gong, Jennifer L. Guerriero, Margaret L. Hoang, E. Shelley Hwang, Hellen Kuasne, Jinho Lee, Yan Liang, Elizabeth A. Mittendorf, Jessica Perez, Aleix Prat, Lajos Pusztai, Jason W. Reeves, Yasser Riazalhosseini, Jennifer K. Richer, Özgür Sahin, Hiromi Sato, Ilana Schlam, Therese Sørlie, Daniel G. Stover, Sandra M. Swain, Alexander Swarbrick, E. Aubrey Thompson, Sara M. Tolaney, Sarah E. Warren, and on behalf of the GeoMx Breast Cancer Consortium
- Subjects
breast cancer ,spatial biology ,RNA and protein profiling ,GeoMx ,digital spatial profiler ,tumor microenvironment ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Breast cancer is a heterogenous disease with variability in tumor cells and in the surrounding tumor microenvironment (TME). Understanding the molecular diversity in breast cancer is critical for improving prediction of therapeutic response and prognostication. High-plex spatial profiling of tumors enables characterization of heterogeneity in the breast TME, which can holistically illuminate the biology of tumor growth, dissemination and, ultimately, response to therapy. The GeoMx Digital Spatial Profiler (DSP) enables researchers to spatially resolve and quantify proteins and RNA transcripts from tissue sections. The platform is compatible with both formalin-fixed paraffin-embedded and frozen tissues. RNA profiling was developed at the whole transcriptome level for human and mouse samples and protein profiling of 100-plex for human samples. Tissue can be optically segmented for analysis of regions of interest or cell populations to study biology-directed tissue characterization. The GeoMx Breast Cancer Consortium (GBCC) is composed of breast cancer researchers who are developing innovative approaches for spatial profiling to accelerate biomarker discovery. Here, the GBCC presents best practices for GeoMx profiling to promote the collection of high-quality data, optimization of data analysis and integration of datasets to advance collaboration and meta-analyses. Although the capabilities of the platform are presented in the context of breast cancer research, they can be generalized to a variety of other tumor types that are characterized by high heterogeneity.
- Published
- 2021
- Full Text
- View/download PDF
17. Gasification of MSW and Biomass using Aspen Plus®
- Author
-
Nguyen L. Hoang
- Subjects
MSW, Gasification, Waste to Energy, Biomass, Aspen Plus - Abstract
Municipal Solid Waste (MSW) refers to solid waste generated by towns and cities from different types of household activities1. Over 2 billion tons of MSW are produced annually. Improper disposal can lead to adverse health outcomes through water, soil and air contamination. Hazardous waste or unsafe waste treatment such as open burning can directly harm waste workers or other people involved in waste burning and neighbouring communities. At the same time, in order to keep up with the need in development, the energy demand also increasing. Therefore, utilize MSW to produce energy is gaining more recognition from public interest. Gasification offers some advantages over traditional method of utilize MSW (incineration, compost). Gasification plants produce significantly lower quantities of air pollutants. The process reduces the environmental impact of waste disposal because it allows for the use of waste products as a feedstock. In this paper, Aspen Plus software was deployed to assess and predict the outcome of the gasification process of MSW. The model was calibrated and validated with various observed data. The condition of input MSW and biomass, as well as the gasification agent were considered. The results revealed that primary products of gasification process are similar to other previously conducted experiments.
- Published
- 2023
18. Occurrence and removal of antibiotic resistant Escherichia coli and antibiotic resistance genes in an urban wastewater treatment plant
- Author
-
T H Le, D K Tong, T T V Pham, T L Hoang, T K Tran, and C Ng
- Subjects
Environmental Engineering ,Environmental Chemistry ,General Agricultural and Biological Sciences - Published
- 2023
19. Symbiosis: Partners in crime
- Author
-
Kim L. Hoang and Kayla C. King
- Subjects
Coleoptera ,Predatory Behavior ,Fungi ,Animals ,Crime ,Symbiosis ,General Agricultural and Biological Sciences ,General Biochemistry, Genetics and Molecular Biology - Abstract
Defensive symbionts protect their hosts against imminent threats. A new study uncovers a symbiosis whereby a fungus safeguards its beetle host from predation, but also exploits the beetle as a vector to help it attack plants and cause disease.
- Published
- 2022
20. Supplementary Table 4 from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Summary of exome sequence analysis of ten Taiwanese ccRCC patients
- Published
- 2023
21. ccRCC cohort characteristics from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Description of Taiwanese ccRCC cohort
- Published
- 2023
22. Copy number alterations in ten AA-exposed Taiwanese ccRCCs from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Circus plots of Taiwanese ccRCCs.
- Published
- 2023
23. Supplementary Table 3 from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Primers used for Sanger sequencing
- Published
- 2023
24. Data from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Background:Aristolochia species used in the practice of traditional herbal medicine contains aristolochic acid (AA), an established human carcinogen contributing to urothelial carcinomas of the upper urinary tract. AA binds covalently to genomic DNA, forming aristolactam (AL)–DNA adducts. Here we investigated whether AA is also an etiologic factor in clear cell renal cell carcinoma (ccRCC).Methods: We conducted a population-based case–control study to investigate the linkage between Aristolochia prescription history, cumulative AA consumption, and ccRCC incidence in Taiwan (5,709 cases and 22,836 matched controls). The presence and level of mutagenic dA-AL-I adducts were determined in the kidney DNA of 51 Taiwanese ccRCC patients. The whole-exome sequences of ccRCC tumors from 10 Taiwanese ccRCC patients with prior exposure to AA were determined.Results: Cumulative ingestion of more than 250 mg of AA increased risk of ccRCC (OR, 1.25), and we detected dA-AL-I adducts in 76% of Taiwanese ccRCC patients. Furthermore, the distinctive AA mutational signature was evident in six of 10 sequenced ccRCC exomes from Taiwanese patients.Conclusions: This study strongly suggests that AA contributes to the etiology of certain RCCs.Impact: The current study offers compelling evidence implicating AA in a significant fraction of the RCC arising in Taiwan and illustrates the power of integrating epidemiologic, molecular, and genetic data in the investigation of cancer etiology. Cancer Epidemiol Biomarkers Prev; 25(12); 1600–8. ©2016 AACR.
- Published
- 2023
25. Supplementary Methods and Supplementary Figure Legend from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Online methods and figures
- Published
- 2023
26. Supplementary Table 2 from Aristolochic Acid in the Etiology of Renal Cell Carcinoma
- Author
-
Thomas A. Rosenquist, Kenneth W. Kinzler, Arthur P. Grollman, Nickolas Papadopoulos, Bert Vogelstein, Yeong-Shiau Pu, Robert J. Turesky, Byeong Hwa Yun, Kathleen G. Dickman, Nicholas J. Roberts, Pau-Chung Chen, Chung-Hsin Chen, and Margaret L. Hoang
- Abstract
Somatic mutations identified from exome sequencing of ten Taiwanese ccRCC patients
- Published
- 2023
27. Site-selective modification of metallic nanoparticles
- Author
-
Khoi Nguyen L. Hoang, Sophia M. McClain, Sean M. Meyer, Catherine A. Jalomo, Nathan B. Forney, and Catherine J. Murphy
- Subjects
Metals ,Materials Chemistry ,Metals and Alloys ,Ceramics and Composites ,Metal Nanoparticles ,Nanoparticles ,General Chemistry ,Ligands ,Catalysis ,Nanostructures ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Abstract
Surface patterning of inorganic nanoparticles through site-selective functionalization with mixed-ligand shells or additional inorganic material is an intriguing approach to developing tailored nanomaterials with potentially novel and/or multifunctional properties. The unique physicochemical properties of such nanoparticles are likely to impact their behavior and functionality in biological environments, catalytic systems, and electronics applications, making it vital to understand how we can achieve and characterize such regioselective surface functionalization. This Feature Article will review methods by which chemists have selectively modified the surface of colloidal nanoparticles to obtain both two-sided Janus particles and nanoparticles with patchy or stripey mixed-ligand shells, as well as to achieve directed growth of mesoporous oxide materials and metals onto existing nanoparticle templates in a spatially and compositionally controlled manner. The advantages and drawbacks of various techniques used to characterize the regiospecificity of anisotropic surface coatings are discussed, as well as areas for improvement, and future directions for this field.
- Published
- 2022
28. Transnational Labour Migration, Remittances and the Changing Family in Asia
- Author
-
L. Hoang, B. Yeoh, L. Hoang, B. Yeoh and L. Hoang, B. Yeoh, L. Hoang, B. Yeoh
- Published
- 2015
29. Effect of mechanical thrombectomy with vs. without intravenous thrombolysis in acute ischemic stroke
- Author
-
N, Quang Anh, V, Dang Luu, L, Hoang Khoe, T, Anh Tuan, L, Hoang Kien, N T, Thu Trang, N, Tat Thien, N, Huu An, T, Cuong, N, Minh Duc, and P, Minh Thông
- Subjects
Male ,Mechanical Thrombolysis ,Brain Ischemia ,Stroke ,Treatment Outcome ,Fibrinolytic Agents ,Tissue Plasminogen Activator ,Humans ,Female ,Thrombolytic Therapy ,Aged ,Ischemic Stroke ,Retrospective Studies ,Thrombectomy - Abstract
The results of mechanical thrombectomy (MT), wi-thout or with intravenous thrombolysis, were evaluated and compared in 178 patients with acute ischemic stroke (AIS) due to large vessel occlusions (LVO) at Bach Mai Hospital.A total of 178 patients with AIS due to LVO were assigned to undergo MT alone (MT-alone group) or MT preceded by intravenous alteplase (the combined group), at a dose of 0.9 mg per kilogram, administered within 4.5 hours after symptom onset (combined group). The successful recanalization rate (assessed as thrombolysis in cerebral infarction [TICI] classification of 2b-3) and the incidence of good clinical recovery outcomes (modified Rankin Scale [mRS] ≤2) after 3 months were analyzed in both groups and compared.A total of 178 patients were enrolled (median age, 65 years; 55% men; median National Institutes of Health Stroke Scale [NIHSS]: 14.3). Favorable outcomes were reported in 76 patients (66.7%) in the MT-alone group and 42 patients (65.6%) in the com-bined group, with no significant between-group difference (P = 0.31 for noninferiority). However, MT alone was associated with a lower percentage of patients with successful reperfusion after MT compared with the combined group (87.7% vs. 90.6%). Mortality at 90 days was 12.2% (14 patients) in the MT-alone group and 17.2% (11 patients) in the combined group. The incidence of symptomatic intracerebral hemorrhage was not significantly different between groups (6 [5.3%] vs. 1 [1.6%]; P = 0.42).Among patients with AIS due to LVO in our study, MT alone was noninferior in terms of functional outcomes compared with MT preceded by the administration of intravenous alteplase within 4.5 hours after symptom onset.
- Published
- 2022
30. Modeling of Film Distillation with Membrane Condenser for Treatment of Reverse Osmosis Concentrate under Vietnam Tropical Conditions
- Author
-
S. V. Makaev, D. O. Kalmykov, G. S. Golubev, I. S. Eremeev, T. L. Hoang, Tr. D. Nguyen, and A. V. Volkov
- Subjects
General Medicine - Published
- 2021
31. Computationally-efficient stochastic cluster dynamics method for modeling damage accumulation in irradiated materials.
- Author
-
Tuan L. Hoang, Jaime Marian, Vasily V. Bulatov, and Peter Hosemann
- Published
- 2015
- Full Text
- View/download PDF
32. Investigation of Baseline Iron Levels in Australian Chickpea and Evaluation of a Transgenic Biofortification Approach
- Author
-
Grace Z. H. Tan, Sudipta S. Das Bhowmik, Thi M. L. Hoang, Mohammad R. Karbaschi, Hao Long, Alam Cheng, Julien P. Bonneau, Jesse T. Beasley, Alexander A. T. Johnson, Brett Williams, and Sagadevan G. Mundree
- Subjects
pulse biofortification ,iron ,genetic modification ,nicotianamine synthase ,soybean ferritin ,crop improvement ,Plant culture ,SB1-1110 - Abstract
Iron deficiency currently affects over two billion people worldwide despite significant advances in technology and society aimed at mitigating this global health problem. Biofortification of food staples with iron (Fe) represents a sustainable approach for alleviating human Fe deficiency in developing countries, however, biofortification efforts have focused extensively on cereal staples while pulses have been largely overlooked. In this study we describe a genetic engineering (GE) approach to biofortify the pulse crop, chickpea (Cicer arietinum L.), with Fe using a combination of the chickpea nicotianamine synthase 2 (CaNAS2) and soybean (Glycine max) ferritin (GmFER) genes which function in Fe transport and storage, respectively. This study consists of three main components: (1) the establishment for baseline Fe concentration of existing germplam, (2) the isolation and study of expression pattern of the novel CaNAS2 gene, and (3) the generation of GE chickpea overexpressing the CaNAS2 and GmFER genes. Seed of six commercial chickpea cultivars was collected from four different field locations in Australia and assessed for seed Fe concentration. The results revealed little difference between the cultivars assessed, and that chickpea seed Fe was negatively affected where soil Fe bioavailability is low. The desi cultivar HatTrick was then selected for further study. From it, the CaNAS2 gene was cloned and its expression in different tissues examined. The gene was found to be expressed in multiple vegetative tissues under Fe-sufficient conditions, suggesting that it may play a housekeeping role in systemic translocation of Fe. Two GE chickpea events were then generated and the overexpression of the CaNAS2 and GmFER transgenes confirmed. Analysis of nicotianamine (NA) and Fe levels in the GE seeds revealed that NA was nearly doubled compared to the null control while Fe concentration was not changed. Increased NA content in chickpea seed is likely to translate into increased Fe bioavailability and may thus overcome the effect of the bioavailability inhibitors found in pulses; however, further study is required to confirm this. This is the first known example of GE Fe biofortified chickpea; information gleaned from this study can feed into future pulse biofortification work to help alleviate global Fe deficiency.
- Published
- 2018
- Full Text
- View/download PDF
33. Finger on the Pulse: Pumping Iron into Chickpea
- Author
-
Grace Z. H. Tan, Sudipta S. Das Bhowmik, Thi M. L. Hoang, Mohammad R. Karbaschi, Alexander A. T. Johnson, Brett Williams, and Sagadevan G. Mundree
- Subjects
pulse biofortification ,iron ,genetic modification ,crop improvement ,chickpea ,Plant culture ,SB1-1110 - Abstract
Iron deficiency is a major problem in both developing and developed countries, and much of this can be attributed to insufficient dietary intake. Over the past decades several measures, such as supplementation and food fortification, have helped to alleviate this problem. However, their associated costs limit their accessibility and effectiveness, particularly amongst the financially constrained. A more affordable and sustainable option that can be implemented alongside existing measures is biofortification. To date, much work has been invested into staples like cereals and root crops—this has culminated in the successful generation of high iron-accumulating lines in rice and pearl millet. More recently, pulses have gained attention as targets for biofortification. Being secondary staples rich in protein, they are a nutritional complement to the traditional starchy staples. Despite the relative youth of this interest, considerable advances have already been made concerning the biofortification of pulses. Several studies have been conducted in bean, chickpea, lentil, and pea to assess existing germplasm for high iron-accumulating traits. However, little is known about the molecular workings behind these traits, particularly in a leguminous context, and biofortification via genetic modification (GM) remains to be attempted. This review examines the current state of the iron biofortification in pulses, particularly chickpea. The challenges concerning biofortification in pulses are also discussed. Specifically, the potential application of transgenic technology is explored, with focus on the genes that have been successfully used in biofortification efforts in rice.
- Published
- 2017
- Full Text
- View/download PDF
34. Creating a database with information about Vietnam’s administrative boundaries
- Author
-
T N Q Phan, T B H Dinh, N L Hoang, and T D Pham
- Subjects
General Medicine ,General Chemistry - Abstract
This study is based on the current state of management and legal documents in Vietnam. The documents related to national borders and territories, documents signed by Vietnam, and international treaties to which Vietnam is a member. Administrative boundaries on the mainland have documents guiding the determination of administrative boundaries. The administrative boundary consists of the land part and the sea part. There is no record of defining administrative boundaries at sea. This study proposes a number of options for determining maritime boundaries (internal waters) for the coastal provinces of Vietnam. Administrative boundary records, maps, and national geographic databases are used to build the administrative boundary database. The research results provide suitable technical solutions to determine the maritime boundary, taking into account the morphological features of the coast. The administrative boundary database is fully built, legal, unified, and included in the management system. The administrative boundary database management system is centrally managed and is capable of providing information to organizations and individuals in need.
- Published
- 2023
35. Experimental Investigation of the Effects of Process Parameters on Cutting Force in External Cylindrical Grinding
- Author
-
L. Hoang, T.-L. Nguyen, and VanTrong Thai
- Subjects
Materials science ,Mechanical Engineering ,Process (computing) ,Mechanical engineering ,Surfaces and Interfaces ,cylindrical grinding ,Cylindrical grinding ,Surfaces, Coatings and Films ,Mechanics of Materials ,Cutting force ,surface roughness ,cutting force ,TJ1-1570 ,Mechanical engineering and machinery ,mathematical model ,alloy steel - Abstract
Cutting force is a vital parameter that affects product quality. Proper control of the cutting force helps optimize the production process as it improves productivity and product quality. This paper assesses the influence of machining parameters, such as alloy steel hardness and workpiece diameters, to cutting forces when external cylindrical grinding by experimental methods. The cutting force was measured using a workpiece shaft-mounted sensor with a balanced bridge-type resistor sensor. Steel for testing: 40Cr, 9CrSi, 65Mn, and W18Cr4V, which were heat-treated at three different hardness levels: 40, 50, and 60 HRC. The Taguchi method's experimental results show that the main parameters affecting cutting forces are: Feed rate of the grinding wheel Sd, cutting depth t, and hardness of workpiece material on the HRC scale. Since then, we built a mathematical model of the normal cutting force function Fn and tangent cutting force function Ft according to Sd, t, and HRC of 9CrSi steel then tested again with three steel types: 40Cr, 65Mn, and W18Cr4V for quite similar results. The cutting force is controlled through cutting parameters suitable for different hardness and workpiece material based on this model.
- Published
- 2021
36. Spatial proteomic characterization of HER2-positive breast tumors through neoadjuvant therapy predicts response
- Author
-
Rohan P. Joshi, Michael F. Press, Jennifer L. Caswell-Jin, Michelle Kriner, Zhicheng Ma, Joseph M. Beechem, Zoey Zhou, Gregory R. Bean, Margaret L. Hoang, Dennis J. Slamon, Jason J. Zoeller, Sara A. Hurvitz, Eran Kotler, Katherine McNamara, and Christina Curtis
- Subjects
Proteomics ,Oncology ,Cancer Research ,medicine.medical_specialty ,Receptor, ErbB-2 ,medicine.medical_treatment ,Breast Neoplasms ,Article ,ErbB-2 ,Breast cancer ,Clinical Research ,Internal medicine ,Antineoplastic Combined Chemotherapy Protocols ,Breast Cancer ,Humans ,Medicine ,Multiplex ,skin and connective tissue diseases ,Neoadjuvant therapy ,Cancer ,screening and diagnosis ,Chemotherapy ,Receiver operating characteristic ,business.industry ,Trastuzumab ,medicine.disease ,Neoadjuvant Therapy ,Clinical trial ,Detection ,Good Health and Well Being ,Cohort ,Biomarker (medicine) ,Immunohistochemistry ,Female ,business ,Receptor ,Biotechnology ,4.2 Evaluation of markers and technologies - Abstract
Addition of HER2-targeted agents to neoadjuvant chemotherapy has dramatically improved pathological complete response (pCR) rates in early stage Human epidermal growth factor receptor 2 (HER2)-positive breast cancer. Still, up to 50% of patients have residual disease following treatment and biomarkers predictive of response are urgently needed. We performed spatial proteomic characterization using NanoString GeoMX Digital Spatial Profiling (DSP) of 122 samples from 57 HER2-positive breast tumors from the neoadjuvant TRIO-US B07 clinical trial (discovery cohort, n=28; validation cohort, n=29) sampled pre-treatment, after 14-21 days of HER2-targeted therapy and at surgery. In situ quantification of 40 tumor and immune proteins across multiple pancytokeratin-enriched regions per sample revealed that treatment results in decreased HER2 signaling and increased immune infiltration after several weeks of therapy. These changes were more dramatic in tumors that ultimately undergo pCR, and a classifier trained to predict pCR using on-treatment and pre-treatment DSP protein levels had a cross-validation mean Area Under the Receiver Operating Characteristics (AUROC) of 0.733 in the discovery cohort and validated in an independent cohort (AUROC = 0.725). Thus, we demonstrate robust stratification of sensitive tumors early during neoadjuvant HER2-targeted therapy using a multiplex spatial proteomic biomarker with implications for tailoring subsequent therapy.
- Published
- 2021
37. Balloon Angioplasty with or without Stenting for Acute Intracranial Atherothrombosis.
- Author
-
Luu, V. Dang, Khoe, L. Hoang, An, N. Huu, Tuan, T. Anh, Anh, N. Quang, Kien, L. Hoang, Thien, N. Tat, Trang, N. Thu, and Trang, D. Thuy
- Subjects
TRANSLUMINAL angioplasty ,THROMBECTOMY ,SURGICAL complications ,PATIENTS' attitudes ,CLINICAL trials - Abstract
Objectives. Due to limited evidence on the optimal strategy for acute atherothrombosis in a large intracranial vessel, we aimed to provide further evidence on the safety and efficacy of balloon angioplasty with or without stenting after failed thrombectomy. Materials & Methods. This single-center retrospective study was performed from June 2017 to February 2021. Patients with acute atherothrombosis in large intracranial vessels treated by balloon angioplasty with or without stenting after failed thrombectomy were enrolled and analyzed. Results. A total of 23 patients were recruited. All patients had a moderate stroke and the majority of them had ASPECTS =7 (82.6%). MCA was the most commonly affected artery (13 cases), followed by supraclinoid ICA (6 cases), and BA (4 cases). Balloon angioplasty was firstly performed in 15 cases, of which 8 cases required subsequent stenting. Intracranial stenting was firstly performed in 8 cases. Successful recanalization (TICI 2b-3) was achieved in 19/23 cases (82.6%) on the final angiogram. Perforated complications occurred in 1/23 cases (4.3%). Good outcome (mRS 0-2) at 90 days was achieved in 13/23 cases (56.5%) and the mortality rate was 4/23 cases (17.4%). The good clinical outcome rate was significantly higher in patients adapted with balloon angioplasty alone versus intracranial stenting. Conclusions. In the present study, balloon angioplasty with or without stenting was obsversed to be safe and efficient as a rescue therapy after failed thrombectomy for acute atherothrombosis in a large intracranial vessel. Balloon angioplasty should be the first choice and stenting should be performed later in refractory cases. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
38. Differential paralog divergence modulates genome evolution across yeast species.
- Author
-
Monica R Sanchez, Aaron W Miller, Ivan Liachko, Anna B Sunshine, Bryony Lynch, Mei Huang, Erica Alcantara, Christopher G DeSevo, Dave A Pai, Cheryl M Tucker, Margaret L Hoang, and Maitreya J Dunham
- Subjects
Genetics ,QH426-470 - Abstract
Evolutionary outcomes depend not only on the selective forces acting upon a species, but also on the genetic background. However, large timescales and uncertain historical selection pressures can make it difficult to discern such important background differences between species. Experimental evolution is one tool to compare evolutionary potential of known genotypes in a controlled environment. Here we utilized a highly reproducible evolutionary adaptation in Saccharomyces cerevisiae to investigate whether experimental evolution of other yeast species would select for similar adaptive mutations. We evolved populations of S. cerevisiae, S. paradoxus, S. mikatae, S. uvarum, and interspecific hybrids between S. uvarum and S. cerevisiae for ~200-500 generations in sulfate-limited continuous culture. Wild-type S. cerevisiae cultures invariably amplify the high affinity sulfate transporter gene, SUL1. However, while amplification of the SUL1 locus was detected in S. paradoxus and S. mikatae populations, S. uvarum cultures instead selected for amplification of the paralog, SUL2. We measured the relative fitness of strains bearing deletions and amplifications of both SUL genes from different species, confirming that, converse to S. cerevisiae, S. uvarum SUL2 contributes more to fitness in sulfate limitation than S. uvarum SUL1. By measuring the fitness and gene expression of chimeric promoter-ORF constructs, we were able to delineate the cause of this differential fitness effect primarily to the promoter of S. uvarum SUL1. Our data show evidence of differential sub-functionalization among the sulfate transporters across Saccharomyces species through recent changes in noncoding sequence. Furthermore, these results show a clear example of how such background differences due to paralog divergence can drive changes in genome evolution.
- Published
- 2017
- Full Text
- View/download PDF
39. Trade-offs in defence to pathogen species revealed in expanding nematode populations
- Author
-
María Ordovás‐Montañés, Gail M. Preston, Kim L. Hoang, Charlotte Rafaluk‐Mohr, and Kayla C. King
- Subjects
Staphylococcus aureus ,Genotype ,Reproduction ,Pseudomonas aeruginosa ,Animals ,Caenorhabditis elegans ,Ecology, Evolution, Behavior and Systematics - Abstract
Many host organisms live in polymicrobial environments and must respond to a diversity of pathogens. The degree to which host defences towards one pathogen species affect susceptibility to others is unclear. We used a panel of Caenorhabditis elegans nematode isolates to test for natural genetic variation in fitness costs of immune upregulation and pathogen damage, as well as for trade-offs in defence against two pathogen species, Staphylococcus aureus and Pseudomonas aeruginosa. We examined the fitness impacts of transient pathogen exposure (pathogen damage and immune upregulation) or exposure to heat-killed culture (immune upregulation only) by measuring host population sizes, which allowed us to simultaneously capture changes in reproductive output, developmental time and survival. We found significant decreases in population sizes for hosts exposed to live versus heat-killed S. aureus and found increased reproductive output after live P. aeruginosa exposure, compared with the corresponding heat-killed challenge. Nematode isolates with relatively higher population sizes after live P. aeruginosa infection produced fewer offspring after live S. aureus challenge. These findings reveal that wild C. elegans genotypes display a trade-off in defences against two distinct pathogen species that are evident in subsequent generations.
- Published
- 2022
40. RNAi as a Foliar Spray: Efficiency and Challenges to Field Applications
- Author
-
Bao Tram L. Hoang, Stephen J. Fletcher, Christopher A. Brosnan, Amol B. Ghodke, Narelle Manzie, and Neena Mitter
- Subjects
Insecta ,Crop Protection ,Organic Chemistry ,General Medicine ,Catalysis ,Computer Science Applications ,Inorganic Chemistry ,Animals ,RNA Interference ,Gene Silencing ,Physical and Theoretical Chemistry ,Molecular Biology ,Spectroscopy ,RNA, Double-Stranded - Abstract
RNA interference (RNAi) is a powerful tool that is being increasingly utilized for crop protection against viruses, fungal pathogens, and insect pests. The non-transgenic approach of spray-induced gene silencing (SIGS), which relies on spray application of double-stranded RNA (dsRNA) to induce RNAi, has come to prominence due to its safety and environmental benefits in addition to its wide host range and high target specificity. However, along with promising results in recent studies, several factors limiting SIGS RNAi efficiency have been recognized in insects and plants. While sprayed dsRNA on the plant surface can produce a robust RNAi response in some chewing insects, plant uptake and systemic movement of dsRNA is required for delivery to many other target organisms. For example, pests such as sucking insects require the presence of dsRNA in vascular tissues, while many fungal pathogens are predominately located in internal plant tissues. Investigating the mechanisms by which sprayed dsRNA enters and moves through plant tissues and understanding the barriers that may hinder this process are essential for developing efficient ways to deliver dsRNA into plant systems. In this review, we assess current knowledge of the plant foliar and cellular uptake of dsRNA molecules. We will also identify major barriers to uptake, including leaf morphological features as well as environmental factors, and address methods to overcome these barriers.
- Published
- 2022
41. Symbiont-mediated immune priming in animals through an evolutionary lens
- Author
-
Kim L. Hoang and Kayla C. King
- Subjects
Ecology ,Immune System ,fungi ,bacteria ,food and beverages ,Animals ,Parasites ,biochemical phenomena, metabolism, and nutrition ,Symbiosis ,Microbiology - Abstract
Protective symbionts can defend hosts from parasites through several mechanisms, from direct interference to modulating host immunity, with subsequent effects on host and parasite fitness. While research on symbiont-mediated immune priming (SMIP) has focused on ecological impacts and agriculturally important organisms, the evolutionary implications of SMIP are less clear. Here, we review recent advances made in elucidating the ecological and molecular mechanisms by which SMIP occurs. We draw on current works to discuss the potential for this phenomenon to drive host, parasite, and symbiont evolution. We also suggest approaches that can be used to address questions regarding the impact of immune priming on host-microbe dynamics and population structures. Finally, due to the transient nature of some symbionts involved in SMIP, we discuss what it means to be a protective symbiont from ecological and evolutionary perspectives and how such interactions can affect long-term persistence of the symbiosis.
- Published
- 2022
42. Thrombectomy Alone versus Bridging Therapy in Acute Ischemic Stroke: Preliminary Results of an Experimental Trial
- Author
-
N, Huu An, V, Dang Luu, M, Duy Ton, T, Anh Tuan, N, Quang Anh, L, Hoang Kien, N, Tat Thien, D, Viet Phuong, and N, Minh Duc
- Subjects
Stroke ,Treatment Outcome ,Fibrinolytic Agents ,Tissue Plasminogen Activator ,Humans ,Brain Ischemia ,Ischemic Stroke ,Thrombectomy - Abstract
For patients with acute large vessel occlusion (ALVO) in the anterior circulation who are able to undergo mechani-cal thrombectomy (MTB) within 4.5 hours, the need for intravenous thrombolysis prior to the intervention remains unclear.Patients who were eligible for intravenous thrombolysis, who presented with ALVO in the anterior circulation, and who started MTB within 4.5 hours were matched at a 1:1 ratio to a thrombectomy alone group or to a bridging therapy group. Patients in the bridging therapy group were administered intravenous alteplase at a standard dose of 0.9 mg/kg. We evaluated the safety and efficacy of the throm-bectomy alone group compared with the bridging therapy group.From December 2020 to September 2021, 60 patients were recruited in the study and completed the trial. The baseline para-meters of patients were similar between the two groups. At the 90-day follow-up, 18 patients (60%) in the thrombectomy alone group versus 18 patients (60%) in the bridging therapy group achieved functional independence (odds ratio [OR]: 1, 95% confidence interval [CI], 0.36-2.81). The successful recanalization (Thrombolysis in Cerebral Infarction [TICI] grade 2b to 3) rates on final angiography were 90% and 86.7%, respectively (OR, 0.72, 95% CI, 0.15-3.55). No significant differences were found between the two groups in the occurrence of symptomatic intracranial hemorrhage or 90-day mortality.Our preliminary results did not show the superiority of thrombectomy alone versus standard bridging therapy in patients with ALVO in the anterior circulation who undergo MTB within 4.5 hours. A larger sample size and other randomized controlled trials remain necessary to validate these results.
- Published
- 2022
43. Dynamic aqueous transformations of lithium cobalt oxide nanoparticle induce distinct oxidative stress responses of B. subtilis
- Author
-
Z. Vivian Feng, Kelly H. Lu, Austin H. Henke, Elizabeth D. Laudadio, Khoi Nguyen L. Hoang, Thomas Pho, Robert J. Hamers, Curtis M. Green, Metti K. Gari, Catherine J. Murphy, and Paul Lemke
- Subjects
Abiotic component ,Aqueous solution ,DNA damage ,Materials Science (miscellaneous) ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,medicine.disease_cause ,01 natural sciences ,chemistry.chemical_compound ,Transformation (genetics) ,chemistry ,medicine ,Biophysics ,Lithium ,0210 nano-technology ,Lithium cobalt oxide ,Oxidative stress ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Lithium cobalt oxide (LiCoO2), an example of nanoscale transition metal oxide and a widely commercialized cathode material in lithium ion batteries, has been shown to induce oxidative stress and generate intracellular reactive oxygen species (ROS) in model organisms. In this study, we aimed to understand the time-dependent roles of abiotic ROS generation and Co ions released in aqueous medium by LiCoO2 NPs, and examined the induced biological responses in model bacterium, B. subtilis upon exposure. We found that the redox-active LiCoO2 NPs produced abiotic ROS primarily through H2O2 generation when freshly suspended. Subsequently, the freshly-suspended LiCoO2 NPs induced additional DNA breakage, and changes in expression of oxidative stress genes in B. subtilis that could not be accounted for by the released Co ions alone. Notably, in 48 hour old LiCoO2 suspensions, H2O2 generation subsided while higher concentrations of Co ions were released. The biological responses in DNA damage and gene expression to the aged LiCoO2 NPs recapitulated those induced by the released Co ions. Our results demonstrated oxidative stress mechanisms for bacteria exposed to LiCoO2 NPs were mediated by the generation of distinct biotic and abiotic ROS species, which depended on the aqueous transformation state of the NPs. This study revealed the interdependent and dynamic nature of NP transformation and their biological consequences where the state of NPs resulted in distinct NP-specific mechanisms of oxidative injury. Our work highlights the need to capture the dynamic transformation of NPs that may activate the multiple routes of oxidative stress responses in cells.
- Published
- 2021
44. Reciprocal redox interactions of lithium cobalt oxide nanoparticles with nicotinamide adenine dinucleotide (NADH) and glutathione (GSH): toward a mechanistic understanding of nanoparticle-biological interactions
- Author
-
Robert J. Hamers, Jenny K. Hedlund Orbeck, Elizabeth D. Laudadio, Ali Abbaspour Tamijani, Catherine J. Murphy, Khoi Nguyen L. Hoang, Z. Vivian Feng, Sara E. Mason, and Austin H. Henke
- Subjects
Chemistry ,Reducing agent ,NADH binding ,Materials Science (miscellaneous) ,Cellular homeostasis ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,Nicotinamide adenine dinucleotide ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Redox ,chemistry.chemical_compound ,Chelation ,NAD+ kinase ,0210 nano-technology ,Cobalt ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Among high-valence metal oxides, LiCoO2 and related materials are of environmental importance because of the rapidly increasing use of these materials as cathodes in lithium ion batteries. Understanding the impact of these materials on aqueous environments relies on understanding their redox chemistry because Co release is dependent on oxidation state. Despite the critical role that redox chemistry plays in cellular homeostasis, the influence of specific biologically relevant electron transporters such as nicotinamide adenine dinucleotide (NADH) and glutathione (GSH) on the transformation of engineered nanoparticles has not been widely considered previously. Here we report an investigation of the interaction of LiCoO2 nanoparticles with NADH and GSH. Measurements of Co release using inductively coupled plasma-mass spectrometry (ICP-MS) show that exposing LiCoO2 nanoparticles to either NADH or GSH increases solubilization of cobalt, while corresponding spectroscopic measurements show that NADH is concurrently oxidized to NAD+. To demonstrate that these effects are a consequence of the high-valence Co(III) in LiCoO2 nanoparticles, we performed control experiments using Co(II)-containing Co(OH)2 and LiCoPO4, and dissolved Co2+/Li+ ions. Additional experiments using molecules of similar structure to NADH and GSH, but that are not reducing agents, confirm that these transformations are driven by redox reactions and not by chelation effects. Our data show that interaction of LiCoO2 with NADH and GSH induces the release of Co2+ ions and alters the redox state of these biologically important transporters. Observation of NADH binding to LiCoO2 using X-ray photoelectron spectroscopy (XPS) suggests a surface catalyzed reaction. The reciprocal reduction of LiCoO2 to enable release of Co2+ and corresponding oxidation of NADH and GSH as model redox-active biomolecules has implications for understanding the biological impacts of high-valence metal oxide nanomaterials.
- Published
- 2021
45. Simulation of Desalination of a Sodium Chloride Aqueous Solution by Membrane Distillation with a Porous Condenser
- Author
-
Tr. D. Nguyen, D. O. Kalmykov, G. S. Golubev, S. V. Makaev, T. L. Hoang, and Alexey Volkov
- Subjects
Materials science ,Aqueous solution ,business.industry ,General Medicine ,Membrane distillation ,Solar energy ,Desalination ,law.invention ,law ,Scientific method ,business ,Porosity ,Process engineering ,Condenser (heat transfer) ,Distillation - Abstract
A scheme of a membrane distillation unit with the possibility of using solar energy collectors has been proposed for treatment of water–salt solutions. This scheme has been tested in the Simulink (MATLAB) simulation environment using a seawater desalination process as a model system. Based on solar radiation data received in Vietnam, a distillation process has been simulated using a solar collector and an electric heater. Experimental approbation of the model has been carried out by the desalination of a NaCl solution by membrane distillation with a porous condenser. The calculated productivity of the modeled system agrees with the obtained experimental data. Simulation showed the possibility of reducing energy consumption by 61% in the process of desalination of an aqueous solution of NaCl using low-grade heat.
- Published
- 2020
46. Coevolution's conflicting role in the establishment of beneficial associations
- Author
-
Kim L. Hoang, Heidi Choi, Nicole M. Gerardo, and Levi T. Morran
- Subjects
Bacteria ,Genetics ,General Agricultural and Biological Sciences ,Symbiosis ,Adaptation, Physiological ,Biological Evolution ,Ecology, Evolution, Behavior and Systematics - Abstract
Reciprocal adaptation between hosts and symbionts can drive the maintenance of symbioses, resulting in coevolution and beneficial genotypic interactions. Consequently, hosts may experience decreased fitness when paired with nonsympatric partners compared to sympatric symbionts. However, coevolution does not preclude conflict-host and symbiont can act to advance their own fitness interests, which do not necessarily align with those of their partner. Despite coevolution's importance in extant symbioses, we know little about its role in shaping the origin of symbioses. Here, we tested the role of coevolution in establishing a novel association by experimentally (co)evolving a host with a protective bacterium under environmental stress. Although evolution in the presence of nonevolving bacteria facilitated host adaptation, co-passaged hosts did not exhibit greater adaptation rates than hosts paired with nonevolving bacteria. Furthermore, co-passaged hosts exhibited greater fecundity when paired with sympatric, co-passaged bacteria compared to co-passaged bacteria with which they did not share an evolutionary history. Thus, shared evolutionary history between the hosts and microbes actually reduced host fitness and has the potential to impede evolution of new beneficial associations.
- Published
- 2022
47. Multiplex real-time PCR assays for the prediction of cephalosporin, ciprofloxacin and azithromycin antimicrobial susceptibility of positive Neisseria gonorrhoeae nucleic acid amplification test samples
- Author
-
M. R. Mulvey, Todd F. Hatchette, M Trubnikov, Irene Martin, Shelley W. Peterson, David C. Alexander, N Barairo, P Naidu, Vanessa Allen, Tom Wong, K Tomas, Brigitte Lefebvre, Walter Demczuk, and L Hoang
- Subjects
0301 basic medicine ,Microbiology (medical) ,Canada ,medicine.drug_class ,030106 microbiology ,Cephalosporin ,Microbial Sensitivity Tests ,Drug resistance ,Azithromycin ,Biology ,Real-Time Polymerase Chain Reaction ,medicine.disease_cause ,Microbiology ,Gonorrhea ,03 medical and health sciences ,0302 clinical medicine ,Antibiotic resistance ,Ciprofloxacin ,Drug Resistance, Bacterial ,medicine ,Humans ,Nucleic Acid Amplification Tests ,Pharmacology (medical) ,Multiplex ,030212 general & internal medicine ,Pharmacology ,Neisseria gonorrhoeae ,Anti-Bacterial Agents ,Cephalosporins ,Infectious Diseases ,medicine.drug - Abstract
Background The incidence of antimicrobial-resistant Neisseria gonorrhoeae (GC) is rising in Canada; however, antimicrobial resistance (AMR) surveillance data are unavailable for infections diagnosed directly from clinical specimens by nucleic acid amplification tests (NAATs), representing over 80% of diagnoses. We developed a set of 10 improved molecular assays for surveillance of GC-AMR and prediction of susceptibilities in NAAT specimens. Methods Multiplex real-time PCR (RT–PCR) assays were developed to detect SNPs associated with cephalosporin (ponA, porB, mtrR −35delA, penA A311V, penA A501, N513Y, G545S), ciprofloxacin (gyrA S91, parC D86/S87/S88) and azithromycin [23S (A2059G, C2611T), mtrR meningitidis-like promoter] resistance. The assays were validated on 127 gonococcal isolates, 51 non-gonococcal isolates and 50 NAATs with matched culture isolates. SNPs determined from the assay were compared with SNPs determined from in silico analysis of WGS data. MICs were determined for culture isolates using the agar dilution method. Results SNP analysis of the 50 NAAT specimens had 96% agreement with the matched culture RT–PCR analysis. When compared with MICs, presence of penA A311V or penA A501 and two or more other SNPs correlated with decreased susceptibility and presence of three or more other SNPs correlated with intermediate susceptibility to cephalosporins; presence of any associated SNP correlated with ciprofloxacin or azithromycin resistance. NAAT-AMR predictions correlated with matched-culture cephalosporin, ciprofloxacin and azithromycin MICs at 94%, 100% and 98%, respectively. Conclusions We expanded molecular tests for N. gonorrhoeae AMR prediction by adding new loci and multiplexing reactions to improve surveillance where culture isolates are unavailable.
- Published
- 2020
48. Abstract P4-10-12: Characterizing the tumor and immune microenvironment through treatment to predict response to neoadjuvant HER2-targeted therapy using the Digital Spatial Profiler
- Author
-
Jason Reeves, Sara A. Hurvitz, Michael F. Press, Dennis J. Slamon, Zoey Zhou, Katherine McNamara, Christina Curtis, Joseph M. Beechem, Zhicheng Ma, Joan S. Brugge, Jennifer L. Caswell-Jin, Margaret L. Hoang, Jason J. Zoeller, and Michelle Kriner
- Subjects
Oncology ,Cancer Research ,medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,medicine.medical_treatment ,Cancer ,medicine.disease ,Lapatinib ,Targeted therapy ,Breast cancer ,Immune system ,Trastuzumab ,Internal medicine ,Biopsy ,medicine ,business ,Neoadjuvant therapy ,medicine.drug - Abstract
Background: While introduction of HER2-targeted therapies has dramatically improved outcomes for patients with HER2-positive disease, even with the addition of HER2-targeted agents, 40-50% of patients do not achieve a pCR (pathologic complete response) following neoadjuvant therapy implying that clinical or molecular differences may be present in responders versus non-responders. While recent bulk expression studies have identified several biomarkers associated with response to HER2-targeted therapies in the neoadjuvant setting, these studies are limited in their ability to assign observed changes to specific geographic or phenotypic cell populations, such as the malignant tumor core or the surrounding microenvironment. Methods: Here we used the Digital Spatial Profiler (DSP, NanoString Technologies, Inc.) to profile regions-of-interest containing pancytokeratin (panCK)+ tumor cells and infiltrated immune cells that are co-localized with the tumor cells. Using this technology, we assayed archival tissue from 28 patients with HER2-positive breast cancer from the TRIO-B07 (NCT00769470) clinical trial, who were treated with trastuzumab, lapatinib, or both, followed by standard chemotherapy plus HER2-targeted therapy. Tissue specimens were collected from the pre-treatment diagnostic biopsy (Baseline) and after one cycle of targeted therapy (Runin). To study regional heterogeneity, we selected an average of four panCK-enriched tissue regions from each sample. Using DSP, we performed multiplexed quantification of 38 tumor and immune protein markers and 96 RNA markers on the selected tissue regions and compared our findings to bulk mRNA expression data from the same cohort. Results: Within the panCK-enriched regions, DSP revealed significant treatment-associated decreases in HER2 protein levels and the downstream PI3K-Akt signaling pathway in Runin compared to Baseline samples. In tandem, we observed a significant increase in infiltrating leukocytes, with CD45, a pan-leukocyte marker, and CD8, a marker for T cells that mediate tumor cell killing, showing the most dramatic changes. These changes in Runin compared to Baseline were more significant in the subset of cases that achieved a pCR versus those that do not, independent of ER status. Comparison of Runin samples to matched Baseline samples from the same patient enabled improved prediction of patient outcome (pCR) compared with analysis of a single timepoint alone. We also found that the DSP panCK enrichment strategy captures additional signal not observed in bulk expression data. For instance, using bulk expression, a decrease in HER2 RNA levels between Baseline and Runin was evident but there was no difference in the degree of decrease in HER2 mRNA between pCR and no pCR cases. Using DSP, we observed that the significant decrease in HER2 levels at Runin is more pronounced in cases that achieved a pCR. Across both tumor and immune markers, regional heterogeneity increased at Runin compared to Baseline. Conclusions: In this study, we used DSP and a panCK enrichment strategy to retrospectively delineate the changes that occurred in tumor cells and co-localized immune cells during HER2-targeted therapy. In comparison to traditional or multiplexed IHC, DSP allows for simultaneous profiling of a large number of markers, enabling the characterization of multiple cancer signaling pathways and immune markers on a single tissue specimen. This study demonstrates the utility of pancytokeratin-enriched spatial proteomic profiling to characterize treatment-associated changes and identify predictive biomarkers. NanoString’s Digital Spatial Profiler is for Research Use Only. Not to be used for diagnostic procedures. Citation Format: Katherine Lee McNamara, Jennifer L. Caswell-Jin, Zhicheng Ma, Jason J. Zoeller, Michelle Kriner, Zoey Zhou, Jason Reeves, Margaret Hoang, Joseph Beechem, Dennis J. Slamon, Michael F. Press, Joan Brugge, Sara A. Hurvitz, Christina Curtis. Characterizing the tumor and immune microenvironment through treatment to predict response to neoadjuvant HER2-targeted therapy using the Digital Spatial Profiler [abstract]. In: Proceedings of the 2019 San Antonio Breast Cancer Symposium; 2019 Dec 10-14; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2020;80(4 Suppl):Abstract nr P4-10-12.
- Published
- 2020
49. Annulation of Hydrazones and Alkynes via Rhodium(III)-Catalyzed Dual C–H Activation: Synthesis of Pyrrolopyridazines and Azolopyridazines
- Author
-
Jonathan A. Ellman, Adam J Zoll, Gia L. Hoang, and Andrew D. Streit
- Subjects
Azoles ,Annulation ,Heteroatom ,Alkyne ,Hydrazone ,chemistry.chemical_element ,Stereoisomerism ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Medicinal chemistry ,Article ,Catalysis ,Rhodium ,chemistry.chemical_compound ,Organometallic Compounds ,Pyrroles ,Physical and Theoretical Chemistry ,chemistry.chemical_classification ,Molecular Structure ,010405 organic chemistry ,Aryl ,Organic Chemistry ,Hydrazones ,0104 chemical sciences ,Pyridazines ,chemistry ,Alkynes - Abstract
Hydrazones readily synthesized from N-aminopyrroles or N-aminoazoles and aldehydes undergo Rh(III)-catalyzed dual C-H activation and coupling with aryl- and alkyl-substituted alkynes to give pyrrolopyridazines or azolopyridazines, respectively. This transformation represents a rare example of hydrazoyl C-H activation and proceeds without heteroatom functionality to direct C-H activation. Hydrazones derived from aromatic, alkenyl, and aliphatic aldehydes were effective inputs, and tethering the alkyne to the hydrazone enabled annulations to more complex, tricyclic products.
- Published
- 2020
50. High-plex Multiomic Analysis in FFPE at Subcellular Level by Spatial Molecular Imaging
- Author
-
Shanshan He, Ruchir Bhatt, Carl Brown, Emily A. Brown, Derek L. Buhr, Kan Chantranuvatana, Patrick Danaher, Dwayne Dunaway, Ryan G. Garrison, Gary Geiss, Mark T. Gregory, Margaret L. Hoang, Rustem Khafizov, Emily E. Killingbeck, Dae Kim, Tae Kyung Kim, Youngmi Kim, Andrew Klock, Mithra Korukonda, Alecksandr Kutchma, Zachary R. Lewis, Yan Liang, Jeffrey S. Nelson, Giang T. Ong, Evan P. Perillo, Joseph C. Phan, Tien Phan-Everson, Erin Piazza, Tushar Rane, Zachary Reitz, Michael Rhodes, Alyssa Rosenbloom, David Ross, Hiromi Sato, Aster W. Wardhani, Corey A. Williams-Wietzikoski, Lidan Wu, and Joseph M. Beechem
- Abstract
The Spatial Molecular Imaging platform (CosMxTM SMI, NanoString Technologies, Seattle, WA) utilizes high-plex in-situ imaging chemistry for both RNA and protein detection. This automated instrument provides 1000’s of plex, at high sensitivity (1 to 2 copies/cell), very low error rate (0.0092 false calls/cell) and background (∼0.04 counts/cell). The imaging system generates three-dimensional super-resolution localization of analytes at ∼2 million cells per sample, four samples per run. Cell segmentation is morphology-based using antibodies, compatible with FFPE samples. Multiomic data (980 RNAs, 108 proteins) were measured at subcellular resolution using FFPE tissues (non-small cell lung (NSCLC) and breast cancer) and allowed identification of over 18 distinct cell types, 10 unique tumor microenvironments, and 100 pairwise ligand-receptor interactions. Over 800,000 single cells and ∼260 million transcripts data are released into the public domain allowing extended data analysis by the entire spatial biology research community.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.