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Utah State University

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2006

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Articles 61 - 73 of 73

Full-Text Articles in Life Sciences

Age And Population Structure Of Joshua Trees (Yucca Brevifolia) In The Northwestern Mojave Desert, K D. Gilliland, Nancy J. Huntly, J E. Anderson Jan 2006

Age And Population Structure Of Joshua Trees (Yucca Brevifolia) In The Northwestern Mojave Desert, K D. Gilliland, Nancy J. Huntly, J E. Anderson

Biology Faculty Publications

Many desert perennials are long-lived, but there are few data on ages or population structures of desert plants. We used 2 methods to estimate ages of a population of Yucca brevifolia (Joshua tree) in southwestern Utah from a 14-year census of plant sizes. Plant height at the 1st census ranged from 0.08 m to 6.0 m, and trees grew in height at a mean rate of 3.75 cm ⋅ yr–1. Plants also increased slowly in basal diameter (0.142 cm ⋅ yr–1) and branch length (0.024 m ⋅ yr–1), but basal diameter varied greatly from year to year, with many plants …

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Intra-Guild Compensation Regulatesspecies Richness In Desert Rodents: Reply, J. R. Goheen, Ethan P. White, S.K. Morgan Ernest, J. H. Brown Jan 2006

Intra-Guild Compensation Regulatesspecies Richness In Desert Rodents: Reply, J. R. Goheen, Ethan P. White, S.K. Morgan Ernest, J. H. Brown

Biology Faculty Publications

No abstract provided.

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A Comparison Of The Species-Time Relationship Across Ecosystems And Taxonomic Groups, Ethan P. White, P. B. Adler, W. K. Lauenroth, R. A. Gill, D. Greenberg, D. M. Kaufman, A. Rassweiler, J. A. Rusak, M. D. Smith, J. R. Steinbeck, R. B. Waide, J. Yao Jan 2006

A Comparison Of The Species-Time Relationship Across Ecosystems And Taxonomic Groups, Ethan P. White, P. B. Adler, W. K. Lauenroth, R. A. Gill, D. Greenberg, D. M. Kaufman, A. Rassweiler, J. A. Rusak, M. D. Smith, J. R. Steinbeck, R. B. Waide, J. Yao

Biology Faculty Publications

The species-time relationship (STR) describes how the species richness of a community increases with the time span over which the community is observed. This pattern has numerous implications for both theory and conservation in much the same way as the speciesarea relationship (SAR). However, the STR has received much less attention and to date only a handful of papers have been published on the pattern. Here we gather together 984 community time-series, representing 15 study areas and 9 taxonomic groups, and evaluate their STRs in order to assess the generality of the STR, its consistency across ecosystems and taxonomic groups, …

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The Offspring/Clutch Size Tradeoff In Mammals, E. L. Charnov, S.K. Morgan Ernest Jan 2006

The Offspring/Clutch Size Tradeoff In Mammals, E. L. Charnov, S.K. Morgan Ernest

Biology Faculty Publications

The Smith‐Fretwell model for optimal offspring size assumes the existence of an inverse proportional relationship (i.e., trade‐off) between the number of offspring and the amount of resources invested in an individual offspring; virtually all of the many models derived from theirs make the same trade‐off assumption. Over the last 30 years it has become apparent that the predicted proportionality is often not observed when evaluated across species. We develop a general allometric approach to correct for size‐related differences in the resources available for reproduction. Using data on mammals, we demonstrate that the predicted inverse proportional relationship between number of offspring …

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Intra-Guild Compensation Regulates Species Richness In Desert Rodents: Reply, J. R. Goheen, Ethan P. White, S.K. Morgan Ernest, J. H. Brown Jan 2006

Intra-Guild Compensation Regulates Species Richness In Desert Rodents: Reply, J. R. Goheen, Ethan P. White, S.K. Morgan Ernest, J. H. Brown

Biology Faculty Publications

Null models have had a long and contentious history in community ecology (Connor and Simberloff 1979, Harvey et al. 1983, Gotelli and Graves 1996, Graves and Rahbek 2005). Much of this debate has arisen because multiple strategies for null models can be used to address a particular question of interest, and the present exchange is no exception. To assess constancy in species richness through time in a desert rodent community, Nichols et al. (2006) have proposed a Markov Chain model as an alternative to the random-walk model we developed (Goheen et al. 2005). While both null models simulate stochastic local …

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Detection Of Early Stages Of Myxobolus Cerebralis In Fin Clips From Rainbow Trout (Onchorynchus Mykiss), Ramona T. Skirpstunas, J. Hergert, Thomas J. Baldwin Jan 2006

Detection Of Early Stages Of Myxobolus Cerebralis In Fin Clips From Rainbow Trout (Onchorynchus Mykiss), Ramona T. Skirpstunas, J. Hergert, Thomas J. Baldwin

Animal, Dairy, and Veterinary Science Faculty Publications

A nested polymerase chain reaction (PCR) assay was used to detect early stages of Myxobolus cerebralis in caudal and adipose fin samples from rainbow trout (RT). To determine sensitivity, groups of 10 RT were exposed to 2,000 M. cerebralis triactinomyxons/fish for 1 hour at 15 degrees C and subsequently moved to clean recirculating water. Fish were held for 2 and 6 hours and 1, 2, 3, 5, 7, 10, 30, and 60 days before sampling by nonlethal fin biopsy. Nested PCR performed on fin clips showed that M. cerebralis DNA was detected in caudal fin tissue in 100% of fish …

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Evaluation Of Immunomodulators, Interferons And Known In Vitro Sars-Cov Inhibitors For Inhibition Of Sars-Cov Replication In Balb/C Mice, Dale L. Barnard, C. W. Day, K. Bailey, M. Heiner, R. Montgomery, L. Lauridsen, P. K-S. Chan, R. W. Sidwell Jan 2006

Evaluation Of Immunomodulators, Interferons And Known In Vitro Sars-Cov Inhibitors For Inhibition Of Sars-Cov Replication In Balb/C Mice, Dale L. Barnard, C. W. Day, K. Bailey, M. Heiner, R. Montgomery, L. Lauridsen, P. K-S. Chan, R. W. Sidwell

Animal, Dairy, and Veterinary Science Faculty Publications

Compounds approved for therapeutic use and in vitro inhibitors of severe acute respiratory syndrome coronavirus (SARS-CoV) were evaluated for inhibition in the mouse SARS-CoV replication model. A hybrid interferon, interferon alpha (IFN-alpha) B/D, and a mismatched double-stranded (ds) RNA interferon (IFN) inducer, Ampligen® (poly I:poly C124), were the only compounds that potently inhibited virus titres in the lungs of infected mice as assessed by CPE titration assays. When mice were dosed intraperitoneally (i.p.) with IFN-alpha B/D once daily for 3 days beginning 4 h after virus exposure, SARS-CoV replication in the lungs of infected mice was reduced by 1 log10 …

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Humanized Monoclonal Antibody Against West Nile Virus Envelope Protein Administered After Neuronal Infection Protects Against Lethal Encephalitis In Hamsters, John D. Morrey, V. Siddharthan, Aaron L. Olsen, G. Y. Roper, H. Wang, Thomas J. Baldwin, S. Koenig, S. Johnson, J. L. Nordstrom, M. S. Diamond Jan 2006

Humanized Monoclonal Antibody Against West Nile Virus Envelope Protein Administered After Neuronal Infection Protects Against Lethal Encephalitis In Hamsters, John D. Morrey, V. Siddharthan, Aaron L. Olsen, G. Y. Roper, H. Wang, Thomas J. Baldwin, S. Koenig, S. Johnson, J. L. Nordstrom, M. S. Diamond

Animal, Dairy, and Veterinary Science Faculty Publications

Humans infected with West Nile virus (WNV) may clinically present with symptoms that are suggestive of neurological infection. Nearly all treatments of WNV disease have been effective in animal models only if administered before or soon after viral challenge. Here, we evaluated whether a potent neutralizing anti-WNV humanized monoclonal antibody (MAb), hE16, could improve the course of disease in a hamster model when administered after the virus had infected neurons in the brain. Five days after viral injection, WNV was detected in the brains of hamsters by cytopathic assay, quantitative reverse-transcription polymerase chain reaction, and immunohistochemical staining of WNV envelope …

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Comparative Toxicosis Of Sodium Selenite And Selenomethionine In Lambs, A. K. Tiwary, B. L. Stegelmeier, K. E. Panter, L. F. James, Jeffery O. Hall Jan 2006

Comparative Toxicosis Of Sodium Selenite And Selenomethionine In Lambs, A. K. Tiwary, B. L. Stegelmeier, K. E. Panter, L. F. James, Jeffery O. Hall

Animal, Dairy, and Veterinary Science Faculty Publications

Excess consumption of selenium (Se) accumulator plants can result in selenium intoxication. The objective of the study reported here was to compare the acute toxicosis caused by organic selenium (selenomethionine) found in plants with that caused by the supplemental, inorganic form of selenium (sodium selenite). Lambs were orally administered a single dose of selenium as either sodium selenite or selenomethionine and were monitored for 7 days, after which they were euthanized and necropsied. Twelve randomly assigned treatment groups consisted of animals given 0, 1, 2, 3, or 4 mg of Se/kg of body weight as sodium selenite, or 0, 1, …

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Bear River Resource Conservation And Development Council, Inc., 2006 Annual Report, Bear River Rc&D, Inc Jan 2006

Bear River Resource Conservation And Development Council, Inc., 2006 Annual Report, Bear River Rc&D, Inc

All U.S. Government Documents (Utah Regional Depository)

No abstract provided.

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Introduction To Edible Crops, Larry A. Sagers Jan 2006

Introduction To Edible Crops, Larry A. Sagers

All Archived Publications

No abstract provided.

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Advanced Master Gardeners At Thanksgiving Point 2006, Larry Sagers Jan 2006

Advanced Master Gardeners At Thanksgiving Point 2006, Larry Sagers

All Archived Publications

No abstract provided.

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Photographing Flowers, Larry A. Segers Jan 2006

Photographing Flowers, Larry A. Segers

Archived Gardening Publications

No abstract provided.

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