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Articles 661 - 690 of 1769

Full-Text Articles in Life Sciences

The Perplexing Paradox Of Clostridioides (Clostridium) Difficile Infection (Cdi) - Analysis Of Anti-Germinants As Part Of Cdi Prophylaxis, Christopher Yip Dec 2019

The Perplexing Paradox Of Clostridioides (Clostridium) Difficile Infection (Cdi) - Analysis Of Anti-Germinants As Part Of Cdi Prophylaxis, Christopher Yip

UNLV Theses, Dissertations, Professional Papers, and Capstones

Clostridioides (Clostridium) difficile infections (CDI) have become the leading cause of nosocomial antibiotic-associated diarrhea worldwide. Under normal circumstances, bacteria found in the gastrointestinal tract provide a barrier against C. difficile colonization. Upon antibiotic therapy, the protective barrier is lost as the microbial community becomes depleted thus providing the opportunity for C. difficile to colonize the human gut. Exposure to taurocholate, a bile acid produced within the mammalian gastrointestinal tract, causes C. difficile spores to begin their transition, a process known as germination, from metabolically dormant structures to toxin-producing cells. As germination is required for the onset of CDI, anti-germination compounds …

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Restructuring Of The Axon Initial Segment In Mouse Models Of Neurodevelopmental Disorders, Rachel Ali Rodriguez Dec 2019

Restructuring Of The Axon Initial Segment In Mouse Models Of Neurodevelopmental Disorders, Rachel Ali Rodriguez

UNLV Theses, Dissertations, Professional Papers, and Capstones

Neurodevelopmental disorders (NDDs) affect more than 36% of children in countries with low- and middle- incomes (Boivin, 2015; McCoy, 2016). Interestingly, these heterogeneous disorders share a high incidence of epileptic seizures, suggesting a shared pathology. Seizures result when neuronal firing activity becomes disturbed and neurons fire excessively or in unregulated patterns. A key site in the control of neuronal firing patterns is the axon initial segment (AIS), where the local density of proteins and the morphology of the AIS in part determine the firing of neurons. We hypothesized that a disruption in the morphology and/or composition of the AIS can …

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Mojave Desert Plant Community Long-Term Response To Disturbance, Dominic M. Gentilcore Dec 2019

Mojave Desert Plant Community Long-Term Response To Disturbance, Dominic M. Gentilcore

UNLV Theses, Dissertations, Professional Papers, and Capstones

All vegetation communities have been shaped by disturbances. This dissertation consists of three separate chapters: Blackbrush (Coleogyne ramosissima) natural regeneration in the Great Basin-Mojave Desert Transition Zone on two fires, Long-term Response to Fire in Eastern Mojave Desert semi-arid shrubland communities, and an Annotated Checklist of Gold Butte National Monument in the Mojave-Colorado Plateau Transition Zone. The section on blackbrush natural regeneration was a long-term dataset from two fires in Basin and Range National Monument that burned in 2008 with monitoring events in 2009, 2010, 2011, 2018 and 2019. The monitoring documented some of the strongest post-fire regeneration for the …

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Tunnel-Tube And Fourier Methods For Measuring Three-Dimensional Medium Reaction Force In Burrowing Animals, Alexis Moore Crisp, Clinton J. Barnes, David V. Lee Dec 2019

Tunnel-Tube And Fourier Methods For Measuring Three-Dimensional Medium Reaction Force In Burrowing Animals, Alexis Moore Crisp, Clinton J. Barnes, David V. Lee

Life Sciences Faculty Research

Subterranean digging behaviors provide opportunities for protection, access to prey, and predator avoidance for a diverse array of vertebrates, yet studies of the biomechanics of burrowing have been limited by the technical challenges of measuring kinetics and kinematics of animals moving within a medium. We describe a new system for measuring 3D reaction forces during burrowing, called a ‘tunnel-tube’, which is composed of two, separately instrumented plastic tubes: an ‘entry tube’ with no medium, in series with a ‘digging tube’ filled with medium. Mean reaction forces are measured for a digging bout and Fourier analysis is used to quantify the …

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Local‐Regional Similarity In Drylands Increases During Multiyear Wet And Dry Periods And In Response To Extreme Events, Matthew D. Petrie, D. P.C. Peters, N. D. Bruss, W. Ji, H. M. Savoy Dec 2019

Local‐Regional Similarity In Drylands Increases During Multiyear Wet And Dry Periods And In Response To Extreme Events, Matthew D. Petrie, D. P.C. Peters, N. D. Bruss, W. Ji, H. M. Savoy

Life Sciences Faculty Research

Climate change is predicted to impact ecosystems through altered precipitation (PPT) regimes. In the Chihuahuan Desert, multiyear wet and dry periods and extreme PPT pulses are the most influential climatic events for vegetation. Vegetation responses are most frequently studied locally, and regional responses are often unclear. We present an approach to quantify correlation of PPT and vegetation responses (as Normalized Difference Vegetation Index [NDVI]) at the Jornada ARS‐LTER site (JRN; 550 km2 area) and the surrounding dryland region (from 0 to 500 km distance; 400,000 km2 study area) as a way to understand regional similarity to locally observed patterns. We …

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Function-Driven Single-Cell Genomics Uncovers Cellulose-Degrading Bacteria From The Rare Biosphere, Devin F. R. Doud, Robert M. Bowers, Frederik Schulz, Markus De Raad, Kai Deng, Angela Tarver, Evan Glasgow, Brian Fox, Sam Deutsch, Yasuo Yoshikuni, Trent Northen, Brian P. Hedlund, Steven W. Singer, Natalia Ivanova, Tanja Woyke Nov 2019

Function-Driven Single-Cell Genomics Uncovers Cellulose-Degrading Bacteria From The Rare Biosphere, Devin F. R. Doud, Robert M. Bowers, Frederik Schulz, Markus De Raad, Kai Deng, Angela Tarver, Evan Glasgow, Brian Fox, Sam Deutsch, Yasuo Yoshikuni, Trent Northen, Brian P. Hedlund, Steven W. Singer, Natalia Ivanova, Tanja Woyke

Life Sciences Faculty Research

No abstract provided.

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Relation Between Relative Handgrip Strength, Chronological Age And Physiological Age With Lower Functional Capacity In Older Women, Wylker Souza Saraiva, Jonato Prestes, Silvana Schwerz Funghetto, James Wilfred Navalta, Ramires Alsamir Tibana, Dahan Da Cunha Nascimento Nov 2019

Relation Between Relative Handgrip Strength, Chronological Age And Physiological Age With Lower Functional Capacity In Older Women, Wylker Souza Saraiva, Jonato Prestes, Silvana Schwerz Funghetto, James Wilfred Navalta, Ramires Alsamir Tibana, Dahan Da Cunha Nascimento

Integrated Health Sciences Faculty Research

Purpose: Relative handgrip strength (RHGS), Aged Based on Exercise Stress Testing (A-BEST), and chronological age were evaluated as predictors of impaired mobility in older women. Methods: Participants included 88 older women (mean age 68.13±6.02 years) referred for exercise stress testing. Estimated physiological age was computed based on exercise capacity, chronotropic reserve index, heart rate recovery, and medication that could affect heart rate. RHGS was measured using a validated handgrip hydraulic dynamometer and mobility was evaluated by timed up and go test (TUG-test). A hierarchical multiple regression predicted TUG-test performance from A-BEST, chronological age and RHGS. Results: After adjustment for diabetes, …

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Relation Between Relative Handgrip Strength, Chronological Age And Physiological Age With Lower Functional Capacity In Older Women, W. Souza Saraiva, J. Prestes, S. Schwerz Funghetto, J. W. Navalta, R. A. Tibana, Dahan Da Cunha Nascimento Nov 2019

Relation Between Relative Handgrip Strength, Chronological Age And Physiological Age With Lower Functional Capacity In Older Women, W. Souza Saraiva, J. Prestes, S. Schwerz Funghetto, J. W. Navalta, R. A. Tibana, Dahan Da Cunha Nascimento

Kinesiology and Nutrition Sciences Faculty Research

Purpose: Relative handgrip strength (RHGS), Aged Based on Exercise Stress Testing (A-BEST), and chronological age were evaluated as predictors of impaired mobility in older women. Methods: Participants included 88 older women (mean age 68.13±6.02 years) referred for exercise stress testing. Estimated physiological age was computed based on exercise capacity, chronotropic reserve index, heart rate recovery, and medication that could affect heart rate. RHGS was measured using a validated handgrip hydraulic dynamometer and mobility was evaluated by timed up and go test (TUG-test). A hierarchical multiple regression predicted TUG-test performance from A-BEST, chronological age and RHGS. Results: After adjustment for diabetes, …

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Biological And Practical Implications Of Genome-Wide Association Study Of Schizophrenia Using Bayesian Variable Selection, Benazir Rowe, Xiangning Chen, Zuoheng Wang, Jingchun Chen, Amei Amei Nov 2019

Biological And Practical Implications Of Genome-Wide Association Study Of Schizophrenia Using Bayesian Variable Selection, Benazir Rowe, Xiangning Chen, Zuoheng Wang, Jingchun Chen, Amei Amei

School of Medicine Faculty Research

Genome-wide association studies (GWAS) have identified over 100 loci associated with schizophrenia. Most of these studies test genetic variants for association one at a time. In this study, we performed GWAS of the molecular genetics of schizophrenia (MGS) dataset with 5334 subjects using multivariate Bayesian variable selection (BVS) method Posterior Inference via Model Averaging and Subset Selection (piMASS) and compared our results with the previous univariate analysis of the MGS dataset. We showed that piMASS can improve the power of detecting schizophrenia-associated SNPs, potentially leading to new discoveries from existing data without increasing the sample size. We tested SNPs in …

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International Society Of Sports Nutrition Position Stand: Nutritional Considerations For Single-Stage Ultra-Marathon Training And Racing, Nicholas B. Tiller, Justin D. Roberts, Liam Beasley, Shaun Chapman, Jorge M. Pinto, Lee Smith, Melanie Wiffin, Mark Russel, S. Andy Sparks, Lauren Duckworth, John O'Hara, Louise Sutton, Jose Antonio, Darryn S. Willoughby, Michael D. Tarpey, Abbie E. Smith-Ryan, Michael J. Ormsbee, Todd A. Astorino, Richard B. Kreider, Graham R. Mcginnis, Jeffrey R, Stout, Johneric W. Smith, Shawn M. Arent, Bill I. Campbell, Laurent Bannock Nov 2019

International Society Of Sports Nutrition Position Stand: Nutritional Considerations For Single-Stage Ultra-Marathon Training And Racing, Nicholas B. Tiller, Justin D. Roberts, Liam Beasley, Shaun Chapman, Jorge M. Pinto, Lee Smith, Melanie Wiffin, Mark Russel, S. Andy Sparks, Lauren Duckworth, John O'Hara, Louise Sutton, Jose Antonio, Darryn S. Willoughby, Michael D. Tarpey, Abbie E. Smith-Ryan, Michael J. Ormsbee, Todd A. Astorino, Richard B. Kreider, Graham R. Mcginnis, Jeffrey R, Stout, Johneric W. Smith, Shawn M. Arent, Bill I. Campbell, Laurent Bannock

Kinesiology and Nutrition Sciences Faculty Research

In this Position Statement, the International Society of Sports Nutrition (ISSN) provides an objective and critical review of the literature pertinent to nutritional considerations for training and racing in single-stage ultra-marathon. Recommendations for Training. i) Ultra-marathon runners should aim to meet the caloric demands of training by following an individualized and periodized strategy, comprising a varied, food-first approach; ii) Athletes should plan and implement their nutrition strategy with sufficient time to permit adaptations that enhance fat oxidative capacity; iii) The evidence overwhelmingly supports the inclusion of a moderate-to-high carbohydrate diet (i.e., ~ 60% of energy intake, 5–8 g·kg− 1·d− 1) …

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Phytoplankton Community And Algal Toxicity At A Recurring Bloom In Sullivan Bay, Kabetogama Lake, Minnesota, Usa, Victoria G. Christensen, Ryan P. Maki, Erin A. Stelzer, Jack E. Norlan, Eakalak Khan Nov 2019

Phytoplankton Community And Algal Toxicity At A Recurring Bloom In Sullivan Bay, Kabetogama Lake, Minnesota, Usa, Victoria G. Christensen, Ryan P. Maki, Erin A. Stelzer, Jack E. Norlan, Eakalak Khan

Civil and Environmental Engineering and Construction Faculty Research

Kabetogama Lake in Voyageurs National Park, Minnesota, USA suffers from recurring late summer algal blooms that often contain toxin-producing cyanobacteria. Previous research identified the toxin microcystin in blooms, but we wanted to better understand how the algal and cyanobacterial community changed throughout an open water season and how changes in community structure were related to toxin production. Therefore, we sampled one recurring bloom location throughout the entire open water season. The uniqueness of this study is the absence of urban and agricultural nutrient sources, the remote location, and the collection of samples before any visible blooms were present. Through quantitative …

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Divergent Selection And Primary Gene Flow Shape Incipient Speciation Of A Riparian Tree On Hawaii Island, Jae Young Choi, Michael Purugganan, Elizabeth A. Stacy Nov 2019

Divergent Selection And Primary Gene Flow Shape Incipient Speciation Of A Riparian Tree On Hawaii Island, Jae Young Choi, Michael Purugganan, Elizabeth A. Stacy

Life Sciences Faculty Research

A long-standing goal of evolutionary biology is to understand the mechanisms underlying the formation of species. Of particular interest is whether or not speciation can occur in the presence of gene flow and without a period of physical isolation. Here, we investigated this process within Hawaiian Metrosideros, a hypervariable and highly dispersible woody species complex that dominates the Hawaiian Islands in continuous stands. Specifically, we investigated the origin of Metrosideros polymorpha var. newellii (newellii), a riparian ecotype endemic to Hawaii Island that is purportedly derived from the archipelago-wide M. polymorpha var. glaberrima (glaberrima). Disruptive selection across a sharp forestriparian ecotone …

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Magnetosome Gene Duplication As An Important Driver In The Evolution Of Magnetotaxis In The Alphaproteobacteria, Haijian Du, Wenyan Zhang, Wensi Zhang, Weijia Zhang, Hongmiao Pan, Yongxin Pan, Dennis A. Bazylinski, Long-Fei Wu, Tian Xiao, Wei Lin Oct 2019

Magnetosome Gene Duplication As An Important Driver In The Evolution Of Magnetotaxis In The Alphaproteobacteria, Haijian Du, Wenyan Zhang, Wensi Zhang, Weijia Zhang, Hongmiao Pan, Yongxin Pan, Dennis A. Bazylinski, Long-Fei Wu, Tian Xiao, Wei Lin

Life Sciences Faculty Research

The evolution of microbial magnetoreception (or magnetotaxis) is of great interest in the fields of microbiology, evolutionary biology, biophysics, geomicrobiology, and geochemistry. Current genomic data from magnetotactic bacteria (MTB), the only prokaryotes known to be capable of sensing the Earth’s geomagnetic field, suggests an ancient origin of magnetotaxis in the domain Bacteria. Vertical inheritance, followed by multiple independent magnetosome gene cluster loss, is considered to be one of the major forces that drove the evolution of magnetotaxis at or above the class or phylum level, although the evolutionary trajectories at lower taxonomic ranks (e.g., within the class level) remain largely …

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Clinical Drug Development For Dementia With Lewy Bodies: Past And Present, Garam Lee, Jeffrey Cummings, Boris Decourt, James B. Leverenz, Marwan N. Sabbagh Oct 2019

Clinical Drug Development For Dementia With Lewy Bodies: Past And Present, Garam Lee, Jeffrey Cummings, Boris Decourt, James B. Leverenz, Marwan N. Sabbagh

School of Medicine Faculty Research

Introduction: Dementia with Lewy bodies (DLB) is an under-researched area despite being the second most common type of degenerative dementia after Alzheimer’s disease. It is an area of unmet need with no approved symptomatic or disease-modifying therapies. The pharmacological management of DLB is complex and challenging because early trials of drugs for DLB have resulted in no demonstrable efficacy. Randomized controlled trials (RCTs) in the DLB population have only recently been initiated. Understanding results from previous and current clinical trials in DLB can provide insights for future research and development. Areas covered: We provide an overview of the DLB drug …

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Identifiying High Risk Areas Of Zika Virus Infection By Meteorological Factors In Columbia, Lung-Chang Chien, Francisco Sy, Adriana Perez Oct 2019

Identifiying High Risk Areas Of Zika Virus Infection By Meteorological Factors In Columbia, Lung-Chang Chien, Francisco Sy, Adriana Perez

Environmental & Global Health Faculty Research

Background Several Zika virus (ZIKV) outbreaks have occurred since October 2015. Because there is no effective treatment for ZIKV infection, developing an effective surveillance and warning system is currently a high priority to prevent ZIKV infection. Despite Aedes mosquitos having been known to spread ZIKV, the calculation approach is diverse, and only applied to local areas. This study used meteorological measurements to monitor ZIKV infection due to the high correlation between climate change and Aedes mosquitos and the convenience to obtain meteorological data from weather monitoring stations. Methods This study applied the Bayesian structured additive regression modeling approach to include …

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Patient And Provider Perspectives On How Trust Influences Maternal Vaccine Acceptance Among Pregnant Women In Kenya, Stacy W. Nganga, Nancy A. Otieno, Maxwell Adero, Dominic Ouma, Sandra S. Chaves, Jennifer R. Verani, Marc-Alain Widdowson, Andrew Wilson, Irina Bergenfeld, Courtni Andrews, Vincent L. Fenimore, Ines Gonzalez-Casanova, Paula M. Frew, Saad B. Omer, Fauzia A. Malik Oct 2019

Patient And Provider Perspectives On How Trust Influences Maternal Vaccine Acceptance Among Pregnant Women In Kenya, Stacy W. Nganga, Nancy A. Otieno, Maxwell Adero, Dominic Ouma, Sandra S. Chaves, Jennifer R. Verani, Marc-Alain Widdowson, Andrew Wilson, Irina Bergenfeld, Courtni Andrews, Vincent L. Fenimore, Ines Gonzalez-Casanova, Paula M. Frew, Saad B. Omer, Fauzia A. Malik

Environmental & Global Health Faculty Research

Background Pregnant women and newborns are at high risk for infectious diseases. Altered immunity status during pregnancy and challenges fully vaccinating newborns contribute to this medical reality. Maternal immunization is a strategy to protect pregnant women and their newborns. This study aimed to find out how patient-provider relationships affect maternal vaccine uptake, particularly in the context of a lower middle- income country where limited research in this area exists. Methods We conducted semi-structured, in-depth narrative interviews of both providers and pregnant women from four sites in Kenya: Siaya, Nairobi, Mombasa, and Marsabit. Interviews were conducted in either English or one …

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Adsorption Of Methylene Blue And In-Situ Reactivation Of Granular Activated Carbon (Gac) With Ozone, Christina Obra, Tran Xuan Vu, Meena Ejjada, George William Kajjumba, Erica J. Marti Oct 2019

Adsorption Of Methylene Blue And In-Situ Reactivation Of Granular Activated Carbon (Gac) With Ozone, Christina Obra, Tran Xuan Vu, Meena Ejjada, George William Kajjumba, Erica J. Marti

LSAMP Poster Presentations

Granular activated carbon (GAC) is a porous, fine-grained adsorbent rich in carbon and it has been widely applied in water and wastewater treatment processes. For instance, GAC can be utilized in adsorption processes. Adsorption is a purification technique in which soluble impurities are removed from the solvent and adhere to the surface and pores of a solid material. Ozonation is extensively used in the treatment of wastewater as well. (Turhan, Durukan, Ozturkcan, & Turgut, 2012). Because of its high oxidizing power, ozone can break down colored substances like dyes in wastewater, which improves the aesthetics of water. However, to treat …

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Testing Protocols For Surveying Captive Limulus Polyphemus Microbiomes, Fabian Leija, Sean A. Neiswenter Dr. Oct 2019

Testing Protocols For Surveying Captive Limulus Polyphemus Microbiomes, Fabian Leija, Sean A. Neiswenter Dr.

LSAMP Poster Presentations

Limulus polyphemus, the Atlantic horseshoe crab, is a marine arthropod that primarily resides in the shallow intertidal zone of brackish water, water where high salinity seawater meets fresh water. The ecological niche that horseshoe crabs reside in makes them an ideal animal to be placed in an aquarium touch-tank, only needing a shallow pool of water to live comfortably as well as having a tough chitin carapace that won’t be easily damaged by visitors touching them. However, the implications of these human-animal interactions are severely unexplored with limited research being conducted regarding touch-tanks. In contrast, the consequences and hygienic practices …

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Archaeological Analysis In The Information Age: Guidelines For Maximizing The Reach, Comprehensiveness, And Longevity Of Data, Sarah W. Kansa, Levent Atici, Eric C. Kansa, Richard H. Meadow Oct 2019

Archaeological Analysis In The Information Age: Guidelines For Maximizing The Reach, Comprehensiveness, And Longevity Of Data, Sarah W. Kansa, Levent Atici, Eric C. Kansa, Richard H. Meadow

Anthropology Faculty Research

With the advent of the Web, increased emphasis on “research data management,” and innovations in reproducible research practices, scholars have more incentives and opportunities to document and disseminate their primary data. This article seeks to guide archaeologists in data sharing by highlighting recurring challenges in reusing archived data gleaned from observations on workflows and reanalysis efforts involving datasets published over the past 15 years by Open Context. Based on our findings, we propose specific guidelines to improve data management, documentation, and publishing practices so that primary data can be more efficiently discovered, understood, aggregated, and synthesized by wider research communities.

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Correction To: Transcriptome Analyses Of Tumor-Adjacent Somatic Tissues Reveal Genes Co-Expressed With Transposable Elements, Micky Chung, G. M. Jonaid, Sophia Quinton, Austin Ross, Corinne E. Sexton, Adrian Alberto, Cody Clymer, Daphnie Churchill, Omar Navarro Leija, Mira V. Han Oct 2019

Correction To: Transcriptome Analyses Of Tumor-Adjacent Somatic Tissues Reveal Genes Co-Expressed With Transposable Elements, Micky Chung, G. M. Jonaid, Sophia Quinton, Austin Ross, Corinne E. Sexton, Adrian Alberto, Cody Clymer, Daphnie Churchill, Omar Navarro Leija, Mira V. Han

Life Sciences Faculty Research

Following publication of the original article [1], the authors reported errors in Table 2 wherein all “KZFP” in the gene names should be changed to “ZNF”.

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Effects Of Rate Of Drying, Life History Phase, And Ecotype On The Ability Of The Moss Bryum Argenteum To Survive Desiccation Events And The Influence On Conservation And Selection Of Material For Restoration, Joshua Lee Greenwood, Lloyd R. Stark, Lindsay P. Chiquoine Oct 2019

Effects Of Rate Of Drying, Life History Phase, And Ecotype On The Ability Of The Moss Bryum Argenteum To Survive Desiccation Events And The Influence On Conservation And Selection Of Material For Restoration, Joshua Lee Greenwood, Lloyd R. Stark, Lindsay P. Chiquoine

Life Sciences Faculty Research

Desiccation stress is frequently experienced by the moss Bryum argenteum and can influence survival, propagation and niche selection. We attempted to disentangle the interacting factors of life history phase (five categories) and rate of desiccation (time allotted for induction of desiccation tolerance) for 13 ecotypes of B. argenteum. Using chlorophyll fluorescence as a stress index, we determined how these parameters influenced desiccation tolerance. Rate of drying and life phase significantly affected desiccation tolerance. The reaction norms of desiccation tolerance displayed by the 13 ecotypes showed a substantial degree of variation in phenotypic plasticity. We observed differences in survival and fluorescence …

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Changes In Pm2.5 Peat Combustion Source Profiles With Atmospheric Aging In An Oxidation Flow Reactor, Judith C. Chow, Junji Cao, Lung-Wen Anthony Chen, Xiaoliang Wang, Qiyuan Wang, Jie Tian, Steven Sai Hang Ho, Adam C. Watts, Tessa B. Carlson, Steven D. Kohl, John G. Watson Oct 2019

Changes In Pm2.5 Peat Combustion Source Profiles With Atmospheric Aging In An Oxidation Flow Reactor, Judith C. Chow, Junji Cao, Lung-Wen Anthony Chen, Xiaoliang Wang, Qiyuan Wang, Jie Tian, Steven Sai Hang Ho, Adam C. Watts, Tessa B. Carlson, Steven D. Kohl, John G. Watson

Environmental & Global Health Faculty Research

Smoke from laboratory chamber burning of peat fuels from Russia, Siberia, the USA (Alaska and Florida), and Malaysia representing boreal, temperate, subtropical, and tropical regions was sampled before and after passing through a potential-aerosol-mass oxidation flow reactor (PAM-OFR) to simulate intermediately aged (∼2 d) and well-aged (∼7 d) source profiles. Species abundances in PM2.5 between aged and fresh profiles varied by several orders of magnitude with two distinguishable clusters, centered around 0.1 % for reactive and ionic species and centered around 10 % for carbon. Organic carbon (OC) accounted for 58 %–85 % of PM2.5 mass in fresh profiles with …

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A Dynamic Quantitative Microbial Risk Assessment For Norovirus In Potable Reuse System, Erfaneh Amoueyan, Sajjad Ahmad, Joseph N.S. Eisenberg, Daniel Gerrity Oct 2019

A Dynamic Quantitative Microbial Risk Assessment For Norovirus In Potable Reuse System, Erfaneh Amoueyan, Sajjad Ahmad, Joseph N.S. Eisenberg, Daniel Gerrity

Civil and Environmental Engineering and Construction Faculty Research

This study describes the results of a dynamic quantitative microbial risk assessment (QMRA) for norovirus (NoV) that was used to evaluate the relative significance of foodborne, person-to-person, and person-to-sewage-to-person transmission pathways. This last pathway was incorporated into simulated potable reuse systems to evaluate the adequacy of typical treatment trains, operational conditions, and regulatory frameworks. The results confirm that secondary and foodborne transmission dominate the overall risk calculation and that waterborne NoV likely contributes no appreciable public health risk, at least in the scenarios modeled in this study. De facto reuse with an environmental buffer storage time of at least 30 …

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Spread Of Domestic Animals Across Neolithic Western Anatolia: New Stable Isotope Evidence From Ugurlu Höyük, The Island Of Gökçeada, Turkey, Suzanne E. Pilaar Birch, Levent Atici, Burcin Erdogu Oct 2019

Spread Of Domestic Animals Across Neolithic Western Anatolia: New Stable Isotope Evidence From Ugurlu Höyük, The Island Of Gökçeada, Turkey, Suzanne E. Pilaar Birch, Levent Atici, Burcin Erdogu

Anthropology Faculty Research

The origins of agriculture in Southwest Asia over 10,000 years ago and its subsequent spread into Europe during the Neolithic have been the focus of much archaeological research over the past several decades. Increasingly more sophisticated analytical techniques have allowed for better understanding of the complex interactions that occurred amongst humans, animals, and their environments during this transition. The Aegean Islands are critically situated where Anatolia and the mainland Greece meet, making the region pivotal for understanding the movement of the Neolithic into Europe. Located on the largest Turkish Aegean island of Gökçeada, the site of Uğurlu Höyük dates to …

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Insights Into The Ecological Roles And Evolution Of Methyl-Coenzyme M Reductase-Containing Hot Spring Archaea, Zheng-Shuang Hua, Yu-Lin Wang, Paul N. Evans, Yan-Ni Qu, Kian Mau Goh, Yang-Zhi Rao, Sun Yat-Sen University Qi, Yu-Xian Li, Min-Jun Huang, Jian-Yu Jiao, Ya-Ting Chen, Wen-Sheng Shu, Wael Hozzein, Brian P. Hedlund, Gene W. Tyson, Tong Zhang, Wen-Jun Li Oct 2019

Insights Into The Ecological Roles And Evolution Of Methyl-Coenzyme M Reductase-Containing Hot Spring Archaea, Zheng-Shuang Hua, Yu-Lin Wang, Paul N. Evans, Yan-Ni Qu, Kian Mau Goh, Yang-Zhi Rao, Sun Yat-Sen University Qi, Yu-Xian Li, Min-Jun Huang, Jian-Yu Jiao, Ya-Ting Chen, Wen-Sheng Shu, Wael Hozzein, Brian P. Hedlund, Gene W. Tyson, Tong Zhang, Wen-Jun Li

Life Sciences Faculty Research

Several recent studies have shown the presence of genes for the key enzyme associated with archaeal methane/alkane metabolism, methyl-coenzyme M reductase (Mcr), in metagenome-assembled genomes (MAGs) divergent to existing archaeal lineages. Here, we study the mcr-containing archaeal MAGs from several hot springs, which reveal further expansion in the diversity of archaeal organisms performing methane/alkane metabolism. Significantly, an MAG basal to organisms from the phylum Thaumarchaeota that contains mcr genes, but not those for ammonia oxidation or aerobic metabolism, is identified. Together, our phylogenetic analyses and ancestral state reconstructions suggest a mostly vertical evolution of mcrABG genes among methanogens and methanotrophs, …

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Insights Into The Ecological Roles And Evolution Of Methyl-Coenzyme M Reductase-Containing Hot Spring Archaea, Zheng-Shuang Hua, Yu-Lin Wang, Paul N. Evans, Yan-Ni Qu, Kian Mau Goh, Yang-Zhi Rao, Yan-Ling Qi, Yu-Xian Li, Min-Jun Huang, Jian-Yu Jiao, Ya-Ting Chen, Wen-Sheng Shu, Wael Hozzein, Brian P. Hedlund, Gene W. Tyson, Tong Zhang, Wen-Jun Li Oct 2019

Insights Into The Ecological Roles And Evolution Of Methyl-Coenzyme M Reductase-Containing Hot Spring Archaea, Zheng-Shuang Hua, Yu-Lin Wang, Paul N. Evans, Yan-Ni Qu, Kian Mau Goh, Yang-Zhi Rao, Yan-Ling Qi, Yu-Xian Li, Min-Jun Huang, Jian-Yu Jiao, Ya-Ting Chen, Wen-Sheng Shu, Wael Hozzein, Brian P. Hedlund, Gene W. Tyson, Tong Zhang, Wen-Jun Li

Life Sciences Faculty Research

Several recent studies have shown the presence of genes for the key enzyme associated with archaeal methane/alkane metabolism, methyl-coenzyme M reductase (Mcr), in metagenome-assembled genomes (MAGs) divergent to existing archaeal lineages. Here, we study the mcr-containing archaeal MAGs from several hot springs, which reveal further expansion in the diversity of archaeal organisms performing methane/alkane metabolism. Significantly, an MAG basal to organisms from the phylum Thaumarchaeota that contains mcr genes, but not those for ammonia oxidation or aerobic metabolism, is identified. Together, our phylogenetic analyses and ancestral state reconstructions suggest a mostly vertical evolution of mcrABG genes among methanogens and methanotrophs, …

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Reproduction And Dispersal Of Biological Soil Crust Organisms, Steven D. Warren, Larry L. St. Clair, Lloyd R. Stark, Louise A. Lewis, Nuttapon Pombubpa, Tania Kurbessoian, Jason E. Stajich, Zachary T. Aanderud Oct 2019

Reproduction And Dispersal Of Biological Soil Crust Organisms, Steven D. Warren, Larry L. St. Clair, Lloyd R. Stark, Louise A. Lewis, Nuttapon Pombubpa, Tania Kurbessoian, Jason E. Stajich, Zachary T. Aanderud

Life Sciences Faculty Research

Biological soil crusts (BSCs) consist of a diverse and highly integrated community of organisms that effectively colonize and collectively stabilize soil surfaces. BSCs vary in terms of soil chemistry and texture as well as the environmental parameters that combine to support unique combinations of organisms—including cyanobacteria dominated, lichen-dominated, and bryophyte-dominated crusts. The list of organismal groups that make up BSC communities in various and unique combinations include—free living, lichenized, and mycorrhizal fungi, chemoheterotrophic bacteria, cyanobacteria, diazotrophic bacteria and archaea, eukaryotic algae, and bryophytes. The various BSC organismal groups demonstrate several common characteristics including—desiccation and extreme temperature tolerance, production of various …

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Best Practice Recommendations For The Use Of External Telemetry Devices On Pinnipeds, Markus Horning, Russel D. Andrews, Amanda M. Bishop, Peter L. Boveng, Daniel P. Costa, Daniel E. Crocker, Martin Haulena, Mark Hindell, Allyson G. Hindle, Rachel R. Holser, Sascha K. Hooker, Luis A. Hückstädt, Shawn Johnson, Mary-Anne Lea, Birgitte I. Mcdonald, Clive R. Mcmahon, Patrick W. Robinson, Renae L. Sattler, Courtney R. Shuert, Sheanna M. Steingass, Dave Thompson, Pamela A. Tuomi, Cassondra L. Williams, Jamie N. Womble Oct 2019

Best Practice Recommendations For The Use Of External Telemetry Devices On Pinnipeds, Markus Horning, Russel D. Andrews, Amanda M. Bishop, Peter L. Boveng, Daniel P. Costa, Daniel E. Crocker, Martin Haulena, Mark Hindell, Allyson G. Hindle, Rachel R. Holser, Sascha K. Hooker, Luis A. Hückstädt, Shawn Johnson, Mary-Anne Lea, Birgitte I. Mcdonald, Clive R. Mcmahon, Patrick W. Robinson, Renae L. Sattler, Courtney R. Shuert, Sheanna M. Steingass, Dave Thompson, Pamela A. Tuomi, Cassondra L. Williams, Jamie N. Womble

Life Sciences Faculty Research

Pinnipeds spend large portions of their lives at sea, submerged, or hauled-out on land, often on remote off-shore islands. This fundamentally limits access by researchers to critical parts of pinniped life history and has spurred the development and implementation of a variety of externally attached telemetry devices (ETDs) to collect information about movement patterns, physiology and ecology of marine animals when they cannot be directly observed. ETDs are less invasive and easier to apply than implanted internal devices, making them more widely used. However, ETDs have limited retention times and their use may result in negative short- and long-term consequences …

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Impaired H-Reflex Adaptations Following Slope Walking In Individuals With Post-Stroke Hemiparesis, Jing Nong Liang, Yun-Ju Lee, Eric Akoopie, Brooke Conway Kleven, Trisha Koch, Kai-Yu Ho Oct 2019

Impaired H-Reflex Adaptations Following Slope Walking In Individuals With Post-Stroke Hemiparesis, Jing Nong Liang, Yun-Ju Lee, Eric Akoopie, Brooke Conway Kleven, Trisha Koch, Kai-Yu Ho

Physical Therapy Faculty Research

Background and Purpose Short term adaptations in the Ia afferent-motoneuron pathway, as measured using the H-reflex, in response to altered ground reaction forces (GRFs) applied at the feet during slope walking have been observed in the non-impaired nervous system. The ability of the stroke-impaired nervous system to adapt to altered GRFs have not been examined. The purpose of this study was to examine the acute effects of altered propulsive and braking forces applied at the feet, which naturally occurs when walking on different slopes, on adaptations of the H-reflex pathway in individuals with chronic post-stroke hemiparesis. Methods Twelve individuals chronically …

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Literature Review: Biocement For Stabilization Of Expansive Soils In Las Vegas, Nevada, Silva Topchyan, Moses Karakouzian Sep 2019

Literature Review: Biocement For Stabilization Of Expansive Soils In Las Vegas, Nevada, Silva Topchyan, Moses Karakouzian

LSAMP Poster Presentations

The aim of this study was to present a possibility for the use of biocementon expansive clay. Expansive soil is a type of clay when exposed to water and moisture changes its volume. Due to the clays swelling and shrinkage behavior itsdifficult to use it in engineering and construction projects, therefore costly and unhealthy techniques have been used to stabiliseexpansive soil in order to address the problem [12]. A possible healthy and environmentally friendly solution is Biocement which uses microbial induced calcite precipitation (MICP) in order to help aggregate soil to form a stable cementitiousmaterial. MICP isdependent on the innate …

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