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Articles 1 - 22 of 22
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How To Assess Your Cure: A Practical Guide For Instructors Of Course-Based Undergraduate Research Experiences, Erin Shortlidge, Sara Brownell
How To Assess Your Cure: A Practical Guide For Instructors Of Course-Based Undergraduate Research Experiences, Erin Shortlidge, Sara Brownell
Biology Faculty Publications and Presentations
Integrating research experiences into undergraduate life sciences curricula in the form of course-based undergraduate research experiences (CUREs) can meet national calls for education reform by giving students the chance to “do science.” In this article, we provide a step-by-step practical guide to help instructors assess their CUREs using best practices in assessment. We recommend that instructors first identify their anticipated CURE learning outcomes, then work to identify an assessment instrument that aligns to those learning outcomes and critically evaluate the results from their course assessment. To aid instructors in becoming aware of what instruments have been developed, we have also …
Peering Below The Diffraction Limit: Robust And Specific Sorting Of Viruses With Flow Cytometry, Shea T. Lance, David J. Sukovich, Kenneth M. Stedman, Adam R. Abate
Peering Below The Diffraction Limit: Robust And Specific Sorting Of Viruses With Flow Cytometry, Shea T. Lance, David J. Sukovich, Kenneth M. Stedman, Adam R. Abate
Biology Faculty Publications and Presentations
Background: Viruses are incredibly diverse organisms and impact all forms of life on Earth; however, individual virions are challenging to study due to their small size and mass, precluding almost all direct imaging or molecular analysis. Moreover, like microbes, the overwhelming majority of viruses cannot be cultured, impeding isolation, replication, and study of interesting new species. Here, we introduce PCR-activated virus sorting, a method to isolate specific viruses from a heterogeneous population. Specific sorting opens new avenues in the study of uncultivable viruses, including recovering the full genomes of viruses based on genetic fragments in metagenomes, or identifying the …
Office Of Regulatory Affairs Strategies For Building An Integrated National Laboratory Network For Food And Feed, Barbara Kowalcyk, Mark R. Mclellan, Lynn Goldman, David Goldman, Harvey T. Holmes, Connie Weaver
Office Of Regulatory Affairs Strategies For Building An Integrated National Laboratory Network For Food And Feed, Barbara Kowalcyk, Mark R. Mclellan, Lynn Goldman, David Goldman, Harvey T. Holmes, Connie Weaver
Biology Faculty Publications and Presentations
An interconnected network of accredited federal, state, local, tribal, and territorial laboratories is critical to ensuring the safety of the U.S. food supply and the development of the Integrated Food Safety System (IFSS). In 2004, as part of a national policy to defend the U.S. food supply against terrorist attacks, major disasters, and other emergencies, the Food Emergency Response Network (FERN) was created to integrate the nation’s multilevel (i.e., federal, state, local, tribal, territorial) food-testing laboratories to detect, identify, respond to, and recover from a bioterrorism act affecting the safety of the food supply, or a public health emergency/outbreak involving …
Scientific Engagement At Fda: A Report To The Fda Science Board From The Scientific Engagement Subcommittee, Anthony Bahinski, Maria C. Friere, Mark R. Mclellan, Bruce M. Psaty, Dan M. Roden, Scott J. Steele
Scientific Engagement At Fda: A Report To The Fda Science Board From The Scientific Engagement Subcommittee, Anthony Bahinski, Maria C. Friere, Mark R. Mclellan, Bruce M. Psaty, Dan M. Roden, Scott J. Steele
Biology Faculty Publications and Presentations
Maintaining active interactions with the broad external scientific community is vital for FDA to fulfill its expanding public health mission. It is essential for the Agency to be well positioned to address emerging areas of regulatory science and rapidly advancing technologies.
Scientific engagement also helps FDA accomplish its mission by increasing awareness of FDA’s responsibilities and helping with the Agency’s critical recruitment and succession planning needs. FDA uses a range of mechanisms for scientific exchange. The Subcommittee was charged with considering:
a. how FDA can improve its interface with the outside scientific community, particularly regarding public-private partnerships (PPPs) and fellowship …
Cho Endonuclease Functions During Dna Interstrand Crosslink Repair In Escherichia Coli, Anthonige Vidya Perera, James Brian Mendenhall, Charmain T. Courcelle, Justin Courcelle
Cho Endonuclease Functions During Dna Interstrand Crosslink Repair In Escherichia Coli, Anthonige Vidya Perera, James Brian Mendenhall, Charmain T. Courcelle, Justin Courcelle
Biology Faculty Publications and Presentations
DNA interstrand crosslinks are complex lesions that covalently link both strands of the duplex DNA. Lesion removal is proposed to initiate via the UvrABC nucleotide excision repair complex, however less is known about the subsequent steps of this complex repair pathway. In this study, we characterized the contribution of nucleotide excision repair mutants to survival in the presence of psoralen-induced damage. Unexpectedly, we observed that the nucleotide excision repair mutants exhibit differential sensitivity to psoralen-induced damage, with uvrC mutants being less sensitive than either uvrA or uvrB. We show that Cho, an alternative endonuclease, acts with UvrAB and is …
A Francisella-Like Endosymbiont In The Gulf Coast Tick Evolved From A Mammalian Pathogen, Jonathan G. Gerhart, Abraham S. Moses, Rahul Raghavan
A Francisella-Like Endosymbiont In The Gulf Coast Tick Evolved From A Mammalian Pathogen, Jonathan G. Gerhart, Abraham S. Moses, Rahul Raghavan
Biology Faculty Publications and Presentations
Ticks (order Ixodida) vector pathogenic bacteria that cause diseases in humans and other mammals. They also contain bacteria that are closely related to pathogens but function as endosymbionts that provide nutrients that are missing from mammalian blood—their sole food source. For instance, mammalian pathogens such as Coxiella burnetii and Francisella tularensis, as well as Coxiella-like and Francisella-like endosymbionts (CLEs and FLEs, respectively) occur in ticks worldwide. However, it is not clear whether the pathogens evolved from symbionts or symbionts from pathogens. Recent studies have indicated that C. burnetii likely originated from a tick-associated ancestor, but the origins …
Reproducibility And Rigor In Ree's Portfolio Of Research, Mark Mclellan, Patsy Brannon, Adriana Campa, Steven Daley-Laursen, Govind Kannan, Neil Olson, Robert Taylor, Dawn Thilmany
Reproducibility And Rigor In Ree's Portfolio Of Research, Mark Mclellan, Patsy Brannon, Adriana Campa, Steven Daley-Laursen, Govind Kannan, Neil Olson, Robert Taylor, Dawn Thilmany
Biology Faculty Publications and Presentations
The Science Advisory Council was established in FY2016 as a subcommittee of the National Agricultural Research, Extension, Education, and Economics (NAREEE) Advisory Board to provide advice and guidance, on a scientific basis, on the overall strength, practicality, and direction of agricultural research, including emerging technology and scientific issues and report any findings publicly to the NAREEE Advisory Board.
In spring of 2016, the USDA Science Advisory Council was first charged by the Chief Scientist to examine a number of controversial and challenging issues. The first was to address the general subject of reproducibility in the agricultural and nutrition related sciences. …
Paternal Mitochondrial Transmission In Intra-Species Caenorhabditis Briggsae Hybrids, Joseph A. Ross, Dana K. Howe, Anna Luella Coleman-Hulbert, Dee R. Denver, Suzanne Estes
Paternal Mitochondrial Transmission In Intra-Species Caenorhabditis Briggsae Hybrids, Joseph A. Ross, Dana K. Howe, Anna Luella Coleman-Hulbert, Dee R. Denver, Suzanne Estes
Biology Faculty Publications and Presentations
To study mitochondrial-nuclear genetic interactions in the nematode Caenorhabditis briggsae, our three laboratories independently created 38 intra-species cytoplasmic-nuclear hybrid (cybrid) lines. Although the cross design combines maternal mitotypes with paternal nuclear genotypes, eight lines (21%) unexpectedly contained paternal mitotypes. All eight share in common ancestry of one of two genetically related strains. This unexpected parallel observation of paternal mitochondrial transmission, undesirable given our intent of creating cybrids, provides a serendipitous experimental model and framework to study the molecular and evolutionary basis of uniparental mitochondrial inheritance.
Reproductive Output Of Mosses Under Experimental Warming On Fildes Peninsula, King George Island, Maritime Antarctica, Angélica Casanova-Katny, G. A. Torres-Mellado, Sarah M. Eppley
Reproductive Output Of Mosses Under Experimental Warming On Fildes Peninsula, King George Island, Maritime Antarctica, Angélica Casanova-Katny, G. A. Torres-Mellado, Sarah M. Eppley
Biology Faculty Publications and Presentations
Background: Mosses dominate much of the vegetation in the Antarctic, but the effect of climatic change on moss growth and sexual reproduction has scarcely been studied. In Antarctica, mosses infrequently produce sporophytes; whether this is due to physiological limitation or an adaptive response is unknown. We studied the effect of experimental warming (with Open Top Chambers, OTCs) on sporophyte production on Fildes Peninsula, King George Island for four moss species (Bartramia patens, Hennediella antarctica, Polytrichastrum alpinum, and Sanionia georgicouncinata). To determine whether reducing cold stress increases sexual reproduction as would be predicted if sex is …
Mitochondrial Dna Sequence And Lack Of Response To Anoxia In The Annual Killifish Austrofundulus Limnaeus, Josiah T. Wagner, Florisela H. Chavez, Jason E. Podrabsky
Mitochondrial Dna Sequence And Lack Of Response To Anoxia In The Annual Killifish Austrofundulus Limnaeus, Josiah T. Wagner, Florisela H. Chavez, Jason E. Podrabsky
Biology Faculty Publications and Presentations
The annual killifish Austrofundulus limnaeus inhabits ephemeral ponds in regions of Venezuela, South America. Permanent populations of A. limnaeus are maintained by production of stress-tolerant embryos that are able to persist in the desiccated sediment. Previous work has demonstrated that A. limnaeus have a remarkable ability to tolerate extended periods of anoxia and desiccating conditions. After considering temperature, A. limnaeus embryos have the highest known tolerance to anoxia when compared to any other vertebrate yet studied. Oxygen is completely essential for the process of oxidative phosphorylation by mitochondria, the intracellular organelle responsible for the majority of adenosine triphosphate production. Thus, …
The Intervening Sequence Of Coxiella Burnetii: Characterization And Evolution, Indu Warrier, Mathias C. Walter, Dimitrios Frangoulidis, Rahul Raghavan, Linda D. Hicks, Michael F. Minnick
The Intervening Sequence Of Coxiella Burnetii: Characterization And Evolution, Indu Warrier, Mathias C. Walter, Dimitrios Frangoulidis, Rahul Raghavan, Linda D. Hicks, Michael F. Minnick
Biology Faculty Publications and Presentations
The intervening sequence (IVS) of Coxiella burnetii, the agent of Q fever, is a 428-nt selfish genetic element located in helix 45 of the precursor 23S rRNA. The IVS element, in turn, contains an ORF that encodes a hypothetical ribosomal S23 protein (S23p). Although S23p can be synthesized in vitro in the presence of an engineered E. coli promoter and ribosome binding site, results suggest that the protein is not synthesized in vivo. In spite of a high degree of IVS conservation among different strains of C. burnetii, the region immediately upstream of the S23p start codon …
Coevolution Of Cyanogenic Bamboos And Bamboo Lemurs On Madagascar, Daniel J. Ballhorn, Fanny Patrika Rakotoarivelo, Stefanie Kautz
Coevolution Of Cyanogenic Bamboos And Bamboo Lemurs On Madagascar, Daniel J. Ballhorn, Fanny Patrika Rakotoarivelo, Stefanie Kautz
Biology Faculty Publications and Presentations
Feeding strategies of specialist herbivores often originate from the coevolutionary arms race of plant defenses and counter-adaptations of herbivores. The interaction between bamboo lemurs and cyanogenic bamboos on Madagascar represents a unique system to study diffuse coevolutionary processes between mammalian herbivores and plant defenses. Bamboo lemurs have different degrees of dietary specialization while bamboos show different levels of chemical defense. In this study, we found variation in cyanogenic potential (HCNp) and nutritive characteristics among five sympatric bamboo species in the Ranomafana area, southeastern Madagascar. The HCNp ranged from 209±72 μmol cyanide* g-1 dwt in Cathariostachys madagascariensis to no cyanide …
Genomics-Informed Isolation And Characterization Of A Symbiotic Nanoarchaeota System From A Terrestrial Geothermal Environment, Louie Wurch, Richard J. Giannone, Bernard S. Belisle, Carolyn Swift, Sagar Utturkar, Robert L. Hettich, Anna-Louise Reysenbach, Mircea Podar
Genomics-Informed Isolation And Characterization Of A Symbiotic Nanoarchaeota System From A Terrestrial Geothermal Environment, Louie Wurch, Richard J. Giannone, Bernard S. Belisle, Carolyn Swift, Sagar Utturkar, Robert L. Hettich, Anna-Louise Reysenbach, Mircea Podar
Biology Faculty Publications and Presentations
Biological features can be inferred, based on genomic data, for many microbial lineages that remain uncultured. However, cultivation is important for characterizing an organism’s physiology and testing its genome-encoded potential. Here we use single-cell genomics to infer cultivation conditions for the isolation of an ectosymbiotic Nanoarchaeota (‘Nanopusillus acidilobi’) and its host (Acidilobus, a crenarchaeote) from a terrestrial geothermal environment. The cells of ‘Nanopusillus’ are among the smallest known cellular organisms (100–300 nm). They appear to have a complete genetic information processing machinery, but lack almost all primary biosynthetic functions as well as respiration and …
Walking Behavior Of Zoo Elephants: Associations Between Gps-Measured Daily Walking Distances And Environmental Factors, Social Factors, And Welfare Indicators, Matthew Robert Holdgate, Cheryl L. Meehan, Jennifer N. Hogan, Lance J. Miller, Josesph Soltis, Jeff Andrews, David J. Shepherdson
Walking Behavior Of Zoo Elephants: Associations Between Gps-Measured Daily Walking Distances And Environmental Factors, Social Factors, And Welfare Indicators, Matthew Robert Holdgate, Cheryl L. Meehan, Jennifer N. Hogan, Lance J. Miller, Josesph Soltis, Jeff Andrews, David J. Shepherdson
Biology Faculty Publications and Presentations
Research with humans and other animals suggests that walking benefits physical health. Perhaps because these links have been demonstrated in other species, it has been suggested that walking is important to elephant welfare, and that zoo elephant exhibits should be designed to allow for more walking. Our study is the first to address this suggestion empirically by measuring the mean daily walking distance of elephants in North American zoos, determining the factors that are associated with variations in walking distance, and testing for associations between walking and welfare indicators. We used anklets equipped with GPS data loggers to measure outdoor …
Recumbence Behavior In Zoo Elephants: Determination Of Patterns And Frequency Of Recumbent Rest And Associated Environmental And Social Factors, Matthew Robert Holdgate, Cheryl L. Meehan, Jennifer N. Hogan, Lance J. Miller, Jeff Rushen, Anne-Marie De Passillé, Josesph Soltis, Jeff Andrews, David J. Shepherdson
Recumbence Behavior In Zoo Elephants: Determination Of Patterns And Frequency Of Recumbent Rest And Associated Environmental And Social Factors, Matthew Robert Holdgate, Cheryl L. Meehan, Jennifer N. Hogan, Lance J. Miller, Jeff Rushen, Anne-Marie De Passillé, Josesph Soltis, Jeff Andrews, David J. Shepherdson
Biology Faculty Publications and Presentations
Resting behaviors are an essential component of animal welfare but have received little attention in zoological research. African savanna elephant (Loxodonta africana) and Asian elephant (Elephas maximus) rest includes recumbent postures, but no large-scale investigation of African and Asian zoo elephant recumbence has been previously conducted. We used anklets equipped with accelerometers to measure recumbence in 72 adult female African (n = 44) and Asian (n = 28)elephants housed in 40 North American zoos. We collected 344 days of data and determined associations between recumbence and social, housing, management, and demographic factors. African elephants were recumbent less (2.1 hours/day, S.D. …
Bayesian Methods For Comparing Species Physiological And Ecological Response Curves, Michael B. Ashcroft, Angélica Casanova-Katny, Kerrie Mengersen, Todd N. Rosenstiel, Johanna D. Turnbull, Jane Wasley, Melinda J. Waterman, Gustavo E. Zúñiga, Sharon A. Robinson
Bayesian Methods For Comparing Species Physiological And Ecological Response Curves, Michael B. Ashcroft, Angélica Casanova-Katny, Kerrie Mengersen, Todd N. Rosenstiel, Johanna D. Turnbull, Jane Wasley, Melinda J. Waterman, Gustavo E. Zúñiga, Sharon A. Robinson
Biology Faculty Publications and Presentations
Many ecological questions require information on species' optimal conditions or critical limits along environmental gradients. These attributes can be compared to answer questions on niche partitioning, species coexistence and niche conservatism. However, these comparisons are unconvincing when existing methods do not quantify the uncertainty in the attributes or rely on assumptions about the shape of species' responses to the environmental gradient. The aim of this study was to develop a model to quantify the uncertainty in the attributes of species response curves and allow them to be tested for substantive differences without making assumptions about the shape of the responses. …
Friend Or Foe—Light Availability Determines The Relationship Between Mycorrhizal Fungi, Rhizobia And Lima Bean (Phaseolus Lunatus L.), Daniel J. Ballhorn, Martin Schädler, Jacob D. Elias, Jess A. Millar, Stefanie Kautz
Friend Or Foe—Light Availability Determines The Relationship Between Mycorrhizal Fungi, Rhizobia And Lima Bean (Phaseolus Lunatus L.), Daniel J. Ballhorn, Martin Schädler, Jacob D. Elias, Jess A. Millar, Stefanie Kautz
Biology Faculty Publications and Presentations
Plant associations with root microbes represent some of the most important symbioses on earth. While often critically promoting plant fitness, nitrogen-fixing rhizobia and arbuscular mycorrhizal fungi (AMF) also demand significant carbohydrate allocation in exchange for key nutrients. Though plants may often compensate for carbon loss, constraints may arise under light limitation when plants cannot extensively increase photosynthesis. Under such conditions, costs for maintaining symbioses may outweigh benefits, turning mutualist microbes into parasites, resulting in reduced plant growth and reproduction. In natural systems plants commonly grow with different symbionts simultaneously which again may interact with each other. This might add complexity …
B-17 Flying Fortress Pilot’S Words For Today’S Graduates ---, Mark R. Mclellan
B-17 Flying Fortress Pilot’S Words For Today’S Graduates ---, Mark R. Mclellan
Biology Faculty Publications and Presentations
An excerpt from Mark McLellan's speech delivered to the 2106 graduating class of PhDs and Master's graduates during the USU Graduate hooding and commencement ceremony at the Spectrum on the campus of USU, May 6, 2016.
Seasonal And Sex Differences In Responsiveness To Adrenocorticotropic Hormone Contribute To Stress Response Plasticity In Red-Sided Garter Snakes (Thamnophis Sirtalis Parietalis), Catherine A. Dayger, Deborah I. Lutterschmidt
Seasonal And Sex Differences In Responsiveness To Adrenocorticotropic Hormone Contribute To Stress Response Plasticity In Red-Sided Garter Snakes (Thamnophis Sirtalis Parietalis), Catherine A. Dayger, Deborah I. Lutterschmidt
Biology Faculty Publications and Presentations
Like many vertebrates, hormonal responses to stress vary seasonally in red-sided garter snakes (Thamnophis sirtalis parietalis). For example, males generally exhibit reduced glucocorticoid responses to a standard stressor during the spring mating season. We asked whether variation in adrenal sensitivity to adrenocorticotropic hormone (ACTH) explains why glucocorticoid responses to capture stress vary with sex, season, and body condition in red-sided garter snakes. We measured glucocorticoids at 0, 1, and 4 hours after injection with ACTH (0.1 IU/g body mass) or vehicle in males and females during the spring mating season and fall pre-hibernation period. Because elevated glucocorticoids can influence sex …
Paths Of Heritable Mitochondrial Dna Mutation And Heteroplasmy In Reference And Gas-1 Strains Of Caenorhabditis Elegans, Riana I. Wernick, Suzanne Estes, Dana K. Howe, Dee R. Denver
Paths Of Heritable Mitochondrial Dna Mutation And Heteroplasmy In Reference And Gas-1 Strains Of Caenorhabditis Elegans, Riana I. Wernick, Suzanne Estes, Dana K. Howe, Dee R. Denver
Biology Faculty Publications and Presentations
Heteroplasmy—the presence of more than one mitochondrial DNA (mtDNA) sequence type in a cell, tissue, or individual—impacts human mitochondrial disease and numerous aging-related syndromes. Understanding the trans-generational dynamics of mtDNA is critical to understanding the underlying mechanisms of mitochondrial disease and evolution. We investigated mtDNA mutation and heteroplasmy using a set of wild-type (N2 strain) and mitochondrial electron transport chain (ETC) mutant (gas-1) mutant Caenorhabditis elegans mutation-accumulation (MA) lines. The N2 MA lines, derived from a previous experiment, were bottlenecked for 250 generations. The gas-1 MA lines were created for this study, and bottlenecked in the laboratory for …
Is Protection Against Florivory Consistent With The Optimal Defense Hypothesis?, Adrienne L. Godschalx, Lauren Stady, Benjamin Watzig, Daniel J. Ballhorn
Is Protection Against Florivory Consistent With The Optimal Defense Hypothesis?, Adrienne L. Godschalx, Lauren Stady, Benjamin Watzig, Daniel J. Ballhorn
Biology Faculty Publications and Presentations
Background: Plant defense traits require resources and energy that plants may otherwise use for growth and reproduction. In order to most efficiently protect plant tissues from herbivory, one widely accepted assumption of the optimal defense hypothesis states that plants protect tissues most relevant to fitness. Reproductive organs directly determining plant fitness, including flowers and immature fruit, as well as young, productive leaf tissue thus should be particularly well-defended. To test this hypothesis, we quantified the cyanogenic potential (HCNp)—a direct, chemical defense—systemically expressed in vegetative and reproductive organs in lima bean (Phaseolus lunatus), and we tested susceptibility of these …
Small Unmanned Aerial Vehicles (Micro-Uavs, Drones) In Plant Ecology, Mitchell B. Cruzan, Ben G. Weinstein, Monica R. Grasty, Brendan F. Kohrn, Elizabeth C. Hendrickson, Tina M. Arredondo, Pamela G. Thompson
Small Unmanned Aerial Vehicles (Micro-Uavs, Drones) In Plant Ecology, Mitchell B. Cruzan, Ben G. Weinstein, Monica R. Grasty, Brendan F. Kohrn, Elizabeth C. Hendrickson, Tina M. Arredondo, Pamela G. Thompson
Biology Faculty Publications and Presentations
Premise of the study: Low-elevation surveys with small aerial drones (micro–unmanned aerial vehicles [UAVs]) may be used for a wide variety of applications in plant ecology, including mapping vegetation over small- to medium-sized regions. We provide an overview of methods and procedures for conducting surveys and illustrate some of these applications.
Methods: Aerial images were obtained by flying a small drone along transects over the area of interest. Images were used to create a composite image (orthomosaic) and a digital surface model (DSM). Vegetation classification was conducted manually and using an automated routine. Coverage of an individual species …