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Articles 61 - 72 of 72
Full-Text Articles in Life Sciences
Virus-Encoded Homologs Of Cellular Interleukin-10 And Their Control Of Host Immune Function, Barry Slobedman, Peter A. Barry, Juliet V. Spencer, Selmir Avdic, Allison Abendroth
Virus-Encoded Homologs Of Cellular Interleukin-10 And Their Control Of Host Immune Function, Barry Slobedman, Peter A. Barry, Juliet V. Spencer, Selmir Avdic, Allison Abendroth
Biology Faculty Publications
No abstract provided.
Summer Burrows Of Ord's Kangaroo Rats (Dipodomys Ordii) In Western Nebraska: Food Content And Structure, Jeremy A. White
Summer Burrows Of Ord's Kangaroo Rats (Dipodomys Ordii) In Western Nebraska: Food Content And Structure, Jeremy A. White
Biology Faculty Publications
Extent of larder hoarding differs among species of kangaroo rats, and limited information is available for food stored in burrows by Ord's kangaroo rat (Dipodomys ordii)—the most widespread species of Dipodomys. I excavated 9 burrows recently used by adult D. ordii during summer in the Sandhill Region of Nebraska. I observed only small quantities of food stored in burrows. Eight of 9 burrows contained segments of sand dropseed (Sporobolus cryptandrus) in limited quantities. These segments consisted of upper leaves with fruits (containing seeds) housed in sheaths. My observations represent the first documentation of D. ordii storing food in burrows under …
Horseshoe Crab Spawning Survey Protocol, Jennifer Mattei
Horseshoe Crab Spawning Survey Protocol, Jennifer Mattei
Biology Faculty Publications
The protocol lists supplies and clothing needed for the survey, as well as which data is to be collected and when and how it should be entered for the census of horseshoe crabs on the Recapture Data Sheet for 2009. Adopted from Cape Cod and Delaware Bay survey protocols.
Choosing The Right Path: Enhancement Of Biologically Relevant Sets Of Genes Or Proteins Using Pathway Structure, Reuben Thomas, Julia M. Gohlke, Geffrey F. Stopper, Frederick M. Parham, Christopher J. Portier
Choosing The Right Path: Enhancement Of Biologically Relevant Sets Of Genes Or Proteins Using Pathway Structure, Reuben Thomas, Julia M. Gohlke, Geffrey F. Stopper, Frederick M. Parham, Christopher J. Portier
Biology Faculty Publications
A method is proposed that finds enriched pathways relevant to a studied condition using the measured molecular data and also the structural information of the pathway viewed as a network of nodes and edges. Tests are performed using simulated data and genomic data sets and the method is compared to two existing approaches. The analysis provided demonstrates the method proposed is very competitive with the current approaches and also provides biologically relevant results.
Conservation Of Selection On Matk Following An Ancient Loss Of Its Flanking Intron, A. M. Duffy, S. A. Kelchner, Paul G. Wolf
Conservation Of Selection On Matk Following An Ancient Loss Of Its Flanking Intron, A. M. Duffy, S. A. Kelchner, Paul G. Wolf
Biology Faculty Publications
The chloroplast gene trnK and its associated group II intron appear to be absent in a large and ancient clade that includes nearly 90% of fern species. However, the maturase protein encoded within the intron (matK) is still present and located on the boundary of a large-scale inversion. We surveyed the chloroplast genome sequence of clade-member Adiantum capillus-veneris for evidence of a still present but fragmented trnK intron. Lack of signature structural domains and sequence motifs in the genome indicate loss of the trnK intron through degradation in an ancestor of the clade. In plants, matK preferentially catalyzes splicing of …
Changes In A Tropical Forest Support Metabolic Zero-Sum Dynamics, S.K. Morgan Ernest, Ethan P. White, J. H. Brown
Changes In A Tropical Forest Support Metabolic Zero-Sum Dynamics, S.K. Morgan Ernest, Ethan P. White, J. H. Brown
Biology Faculty Publications
Major shifts in many ecosystem-level properties of tropical forests have been observed, but the processes driving these changes are poorly understood. Over the past two decades, the forest on Barro Colorado Island, Panama (BCI) exhibited a 20% decrease in the number of trees and a 10% increase in average tree diameter. Here we show that these changes are consistent with a zero-sum constraint operating in this forest. Zero-sum constraints result when the total resource use of an ecosystem is limited by available resources. This causes increases in resource use by some groups of organisms to be compensated for by decreases …
Long-Term Monitoring And Experimentalmanipulation Of A Chihuahuan Desert Ecosystem Near Portal, Arizona, Usa, S.K. Morgan Ernest, T. J. Valone, J. H. Brown
Long-Term Monitoring And Experimentalmanipulation Of A Chihuahuan Desert Ecosystem Near Portal, Arizona, Usa, S.K. Morgan Ernest, T. J. Valone, J. H. Brown
Biology Faculty Publications
Desert ecosystems have long served as model systems in the study of ecological concepts (e.g., competition, resource pulses, top-down/bottom-up dynamics). However, the inherent variability of resource availability in deserts, and hence consumer dynamics, can also make them challenging ecosystems to understand. Study of a Chihuahuan desert ecosystem near Portal, Arizona, USA, began in 1977. At this site, 24 experimental plots were established in 1977 and divided among controls and experimental manipulations. Experimental manipulations over the years include removal of all or some rodent species, all or some ants, seed additions, and various alterations of the annual plant community. While some …
An Introduction To The Biocomplexity Of Sanak Island, Western Gulf Alaska, Hd G. Maschner, M Betts, J Cornell, B Finney, J A. Dunne, Nancy J. Huntly, J W. Jordan, N Misarti, K L. Reedy-Maschner, R Russell
An Introduction To The Biocomplexity Of Sanak Island, Western Gulf Alaska, Hd G. Maschner, M Betts, J Cornell, B Finney, J A. Dunne, Nancy J. Huntly, J W. Jordan, N Misarti, K L. Reedy-Maschner, R Russell
Biology Faculty Publications
The Sanak Biocomplexity Project is a transdisciplinary research effort focused on a small island archipelago 50 km south of the Alaska Peninsula in the western Gulf of Alaska. This team of archaeologists, terrestrial ecologists, social anthropologists, intertidal ecologists, geologists, oceanographers, paleoecologists, and modelers is seeking to understanding the role of the ancient, historic, and modern Aleut in the structure and functioning of local and regional ecosystems. Using techniques ranging from systematic surveys to stable isotope chemistry, long-term shifts in social dynamics and ecosystem structure are present in the context of changing climatic regimes and human impacts. This paper presents a …
Differences In Nitrate Uptakeamong Benthic Algal Assemblages In A Mountain Stream, Michelle A. Baker, G. De Guzman
Differences In Nitrate Uptakeamong Benthic Algal Assemblages In A Mountain Stream, Michelle A. Baker, G. De Guzman
Biology Faculty Publications
We evaluated how benthic algal assemblages that vary in composition, richness, and other diversity metrics remove NO 3 -N from the water column of a mountain stream. Ecological theory and empirical studies suggest that ecosystem process rates should increase as richness increases because of niche separation or activity of dominant taxa. Accordingly, we predicted that algal assemblages with highest richness would show the highest rates of NO 3 -N uptake. To test this prediction, we transplanted 225 rocks representing 3 patch types (green, yellow, and brown) that differed macroscopically in algal composition from a lake outflow stream to a lake …
Estrogenic Compounds Downstream From Three Small Cities In Eastern Nebraska: Occurrence And Biological Effect, Marlo K. Sellin, Daniel D. Snow, Debbie L. Akerly, Alan S. Kolok
Estrogenic Compounds Downstream From Three Small Cities In Eastern Nebraska: Occurrence And Biological Effect, Marlo K. Sellin, Daniel D. Snow, Debbie L. Akerly, Alan S. Kolok
Biology Faculty Publications
Recent studies have detected estrogenic compounds in surface waters in North America and Europe. Furthermore, the presence of estrogenic compounds in surface waters has been attributed, in some cases, to the discharge of wastewater treatment plant (WWTP) effluent. The primary objective of the current study was to determine if WWTP effluent contributes estrogens to the surface waters of Nebraska. A second objective of this study was to determine if estrogens were found in concentrations sufficient enough to manifest feminizing effects on fish. These objectives were satisfied by deploying polar organic chemical integrative samplers (POCIS) and caged fathead minnows at eight …
The Effects Of Chronic Inorganic And Organic Phosphate Exposure On Bactericidal Activity Of The Coelomic Fluid Of The Sea Urchin Lytechinus Variegatus (Echinodermata: Echinoidea), S. Anne Boettger, James B. Mcclintock
The Effects Of Chronic Inorganic And Organic Phosphate Exposure On Bactericidal Activity Of The Coelomic Fluid Of The Sea Urchin Lytechinus Variegatus (Echinodermata: Echinoidea), S. Anne Boettger, James B. Mcclintock
Biology Faculty Publications
No abstract provided.
Cuscuta Jepsonii (Convolvulaceae): An Invasive Weed Or An Extinct Endemic?, Mihai Costea, Saša Stefanović
Cuscuta Jepsonii (Convolvulaceae): An Invasive Weed Or An Extinct Endemic?, Mihai Costea, Saša Stefanović
Biology Faculty Publications
Despite their ecological significance, parasitic plants face more conservation challenges than do autotrophic plants. This is especially true for the groups that include weedy or invasive species such as Cuscuta. While approximately half of the Cuscuta (dodders) species may require conservation measures, the genus as a whole is sometimes posted on governmental lists of noxious or quarantine weeds. Our study challenges this stereotype and uses the case of C. jepsonii (Jepson’s dodder) to illustrate the precarious biodiversity and conservation status faced by many dodder species. Until now, Jepson’s dodder has been known only from its type collection. Consequently, its …