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Articles 1 - 27 of 27
Full-Text Articles in Life Sciences
Cascading Disturbances In Florida Bay, Usa: Cyanobacteria Blooms, Sponge Mortality, And Implications For Juvenile Spiny Lobsters Panulirus Argus, Mark J. Butler Iv, John H. Hunt, William F. Herrnkind, Michael J. Childress, Rodney Bertelsen, William Sharp, Thomas Matthews, Jennifer M. Field, Harold G. Marshall
Cascading Disturbances In Florida Bay, Usa: Cyanobacteria Blooms, Sponge Mortality, And Implications For Juvenile Spiny Lobsters Panulirus Argus, Mark J. Butler Iv, John H. Hunt, William F. Herrnkind, Michael J. Childress, Rodney Bertelsen, William Sharp, Thomas Matthews, Jennifer M. Field, Harold G. Marshall
Biological Sciences Faculty Publications
Florida Bay, the shallow lagoon separating mainland Florida and the Florida Keys, USA, is experiencing an unprecedented series of ecological disturbances. In 1991, following reports of other ecosystem perturbations, we observed widespread and persistent blooms of cyanobacteria that coincided with the decimation of sponge communities over hundreds of square kilometers. Juvenile Caribbean spiny lobsters Panulirus argus, among other animals, rely on sponges for shelter; the impact of sponge loss on the abundance of lobsters and their use of shelter, in particular, has been dramatic. The loss of sponges on 27 experimental sites in hard bottom habitat in central Florida Bay …
Evolutionary Endocrinology Of Juvenile Hormone Esterase In Gryllus Assimilis: Direct And Correlated Responses To Selection, Anthony J. Zera, Caiqiu Zhang
Evolutionary Endocrinology Of Juvenile Hormone Esterase In Gryllus Assimilis: Direct And Correlated Responses To Selection, Anthony J. Zera, Caiqiu Zhang
Anthony Zera Publications
Hemolymph juvenile hormone esterase (JHE) activity on the third day of the last stadium in the cricket, Gryllus assimilis, exhibited a significant response to selection in each of six replicate lines. Mean realized heritability was 0.26 ± 0.04. The response was due to changes in whole-organism enzyme activity as well as to changes in the proportion of enzyme allocated to the hemolymph compartment. In vivo juvenile hormone metabolism differed between some lines selected for high vs. low enzyme activity. Only minimal differences were observed between lines with respect to hemolymph protein concentration or whole-cricket activity of juvenile hormone epoxide …
Nitrous Oxide Loss From Poultry Manure-Amended Soil After Rain, Mark S. Coyne, A. Villalba, Robert L. Blevins
Nitrous Oxide Loss From Poultry Manure-Amended Soil After Rain, Mark S. Coyne, A. Villalba, Robert L. Blevins
Plant and Soil Sciences Faculty Publications
Land application of poultry wastes in Kentucky will increase as the broiler industry grows. If poultry manure stimulates N2O loss from soil it will reduce the fertilizer N value of this waste. In contrast, stimulated N2O loss in grass filter strips receiving the runoff from manured fields could help reduce contamination of surface water by NO−3. Our objectives were to determine (i) if poultry manure stimulated N2O loss in soil after rainfall and (ii) if there was an edge-of-field effect on N2O loss in grass filters intercepting runoff from …
Responses To Toxicants Of An Escherichia Coli Strain Carrying A Uspa'::Lux Genetic Fusion And An E. Coli Strain Carrying A Grpe'::Lux Fusion Are Similar, T. K. Van Dyk, D. R. Smulski, T. R. Reed, S. Belkin, Amy Cheng Vollmer, R. A. Larossa
Responses To Toxicants Of An Escherichia Coli Strain Carrying A Uspa'::Lux Genetic Fusion And An E. Coli Strain Carrying A Grpe'::Lux Fusion Are Similar, T. K. Van Dyk, D. R. Smulski, T. R. Reed, S. Belkin, Amy Cheng Vollmer, R. A. Larossa
Biology Faculty Works
A transcriptional fusion of the Escherichia coli uspA promoter to luxCDABE was characterized and compared with a heat shock-responsive grpE'::lux fusion. Similarities in range and rank order of inducing conditions were observed; however, the magnitude of induction was typically greater for the grpE'::lux fusion strain.
Selective Increases In Antibody Isotypes And Immunoglobulin G Subclass Responses To Secreted Antigens In Tuberculosis Patients And Healthy Household Contacts Of The Patients, R Hussain, G Dawood, N Abrar, Z Toossi, A Minai, M Dojki, J J. Ellner
Selective Increases In Antibody Isotypes And Immunoglobulin G Subclass Responses To Secreted Antigens In Tuberculosis Patients And Healthy Household Contacts Of The Patients, R Hussain, G Dawood, N Abrar, Z Toossi, A Minai, M Dojki, J J. Ellner
Department of Pathology and Laboratory Medicine
Mycobacterium tuberculosis-specific antibodies (immunoglobulin M [IgM], IgE, IgG, and IgG subclasses) were determined in 164 tuberculosis patients (pulmonary involvement, n = 135; lymph node involvement, n = 29), 59 healthy household contacts (HC), and 51 healthy endemic donors (EC) by a quantitative enzyme-linked immunosorbent assay for reactivity with culture filtrate. Among the isotypes, significant differences between tuberculosis patient groups with either pulmonary or lymph node involvement and healthy control groups (HC and EC) were detected only for IgG (P < 0.001) and IgG1 (P < 0.001) antibodies. Pulmonary patients also showed a significant difference with IgM (P < 0.01) and IgE (P < 0.05) antibodies. HC showed elevation of only IgM antibodies compared with EC, indicating that IgM antibodies may be an indicator of recent infection with M. tuberculosis. These results suggest that the switching of IgM antibody response to IgG1 is a critical event in disease progression. Polyclonal IgG1, IgG3, and IgE antibodies also showed significant elevation (P < 0.05) in patients compared with EC. A strong correlation (rho = 0.254; P < 0.003) was observed between M. tuberculosis-specific IgG1 and polyclonal IgG1 in patients, suggesting that activations of antigen-specific and polyclonal antibodies are related events. No correlation was found between IgG1 antibodies and purified protein derivative skin test results. Since IgG1 antibody responses to culture filtrate are present only after disease establishment, IgG1 responses could provide a useful diagnostic marker of disease.
Synergistic Induction Of The Heat Shock Response In Escherichia Coli By Simultaneous Treatment With Chemical Inducers, T. K. Van Dyk, T. R. Reed, Amy Cheng Vollmer, R. A. Larossa
Synergistic Induction Of The Heat Shock Response In Escherichia Coli By Simultaneous Treatment With Chemical Inducers, T. K. Van Dyk, T. R. Reed, Amy Cheng Vollmer, R. A. Larossa
Biology Faculty Works
No abstract provided.
Association Between Ns3 And Ns5 Proteins Of Dengue Virus Type 2 In The, Mini Kapoor, Luwen Zhang, Muralidhara Ramachandra, Jingo Kusukawa, Kurt E. Ebner, R. Padmanabhan
Association Between Ns3 And Ns5 Proteins Of Dengue Virus Type 2 In The, Mini Kapoor, Luwen Zhang, Muralidhara Ramachandra, Jingo Kusukawa, Kurt E. Ebner, R. Padmanabhan
Nebraska Center for Virology: Faculty Publications
Dengue virus type 2, a member of the family Flaviviridae, encodes a single polyprotein precursor consisting of 3391 amino acid residues that is processed to at least 10 mature proteins by host and viral proteases. The NS3 protein contains a domain commonly found in cellular serine proteinases that in cooperation with NS2B is involved in polyprotein processing. In addition, NS3 and NS5 proteins contain conserved motifs found in several RNA helicases and RNA-dependent RNA polymerases, respectively. Both enzymatic activities have been suggested to be involved in viral RNA replication. In this report, we demonstrate that the NS3 and NS5 proteins …
Transactivation Of The Moloney Murine Leukemia Virus And T-Cell Receptor Beta-Chain Enhancers By Cbf And Ets Requires Intact Binding Sites For Both Proteins., Wanwen Sun, Barbara J. Graves, Nancy A. Speck
Transactivation Of The Moloney Murine Leukemia Virus And T-Cell Receptor Beta-Chain Enhancers By Cbf And Ets Requires Intact Binding Sites For Both Proteins., Wanwen Sun, Barbara J. Graves, Nancy A. Speck
Dartmouth Scholarship
The Moloney murine leukemia virus (Mo-MLV) enhancer contains binding sites (LVb and LVc) for the ets gene family of proteins and a core site that binds the polyomavirus enhancer-binding protein 2/core-binding factor (cbf) family of proteins. The LVb and core sites in the Mo-MLV enhancer contribute to its constitutive activity in T cells. All three binding sites (LVb, LVc, and core) are required for phorbol ester inducibility of the Mo-MLV enhancer. Adjacent binding sites for the ets and cbf proteins likewise constitute a phorbol ester response element within the human T-cell receptor beta-chain (TCR beta) enhancer and contribute to constitutive …
A 55 Year Old Diabetic Presenting With A Rash And Polyneuropathy, S Hyder, H Rasool, H Naqvi, Naila Kayani
A 55 Year Old Diabetic Presenting With A Rash And Polyneuropathy, S Hyder, H Rasool, H Naqvi, Naila Kayani
Department of Pathology and Laboratory Medicine
No abstract provided.
Oxygen Control Of The Bradyrhizobium Japonicum Hema Gene., Karen M. Page, Mary Lou Guerinot
Oxygen Control Of The Bradyrhizobium Japonicum Hema Gene., Karen M. Page, Mary Lou Guerinot
Dartmouth Scholarship
The hemA gene of Bradyrhizobium japonicum, which encodes the first enzyme in the heme biosynthetic pathway, is regulated by oxygen. Up to ninefold induction of beta-galactosidase activity is seen when cultures of B. japonicum containing either a plasmid-encoded or a chromosomally integrated hemA-lacZ fusion are shifted to restricted aeration. The oxygen effect is mediated via the FixLJ two-component regulatory system, which regulates the expression of a number of genes involved in the nitrogen fixation process in response to low-oxygen conductions; oxygen induction is lost when the hemA-lacZ fusion is expressed in strains of B. japonicum carrying mutations in fixL or …
A Tef-1-Independent Mechanism For Activation Of The Simian Virus 40 (Sv40) Late Promoter By Mutant Sv40 Large T Antigens., Paul Casaz, Phillip W. Rice, Charles N. Cole, Ulla Hansen
A Tef-1-Independent Mechanism For Activation Of The Simian Virus 40 (Sv40) Late Promoter By Mutant Sv40 Large T Antigens., Paul Casaz, Phillip W. Rice, Charles N. Cole, Ulla Hansen
Dartmouth Scholarship
Simian virus 40 (SV40) large tumor antigen (T antigen) stimulates the activity of the SV40 late promoter and a number of cellular and other viral promoters. We have characterized the ability of T antigens with mutations in the DNA-binding domain and within the N-terminal 85 residues to activate the SV40 late promoter. T antigens lacking both nonspecific and sequence-specific DNA-binding activities were able to induce the late promoter. Mutations within the N-terminal 85 residues of T antigen diminished activation by less than twofold. Activation by wild-type and most of the mutant T antigens required intact binding sites for the cellular …
Fecal Bacteria In Agricultural Waters Of The Bluegrass Region Of Kentucky, J. M. Howell, Mark S. Coyne, P. L. Cornelius
Fecal Bacteria In Agricultural Waters Of The Bluegrass Region Of Kentucky, J. M. Howell, Mark S. Coyne, P. L. Cornelius
Plant and Soil Sciences Faculty Publications
Agricultural runoff influenced by nonpoint pollution frequently exceeds the USEPA standards for bacterial contamination of primary contact water (200 fecal coliforms/100 mL). Few studies have evaluated the effect of cattle (Bos taurus) grazing on fecal contamination of ground water in the karst topography of central Kentucky. Our objectives were to: (i) observe the extent and pattern of fecal bacteria in agricultural waters from two central Kentucky watersheds; (ii) determine if monthly sampling accurately assessed the extent and variability of fecal contamination; and (iii) assess the fecal coliform/fecal streptococci ratio (FC/FS) as an indicator of fecal bacteria source. Springs, …
Transcriptional Activity Of Core Binding Factor-Alpha (Aml1) And Beta Subunits On Murine Leukemia Virus Enhancer Cores., Ari L. Zaiman, Amy F. Lewis, Barbara E. Crute, N. A. Speck, Jack Lenz
Transcriptional Activity Of Core Binding Factor-Alpha (Aml1) And Beta Subunits On Murine Leukemia Virus Enhancer Cores., Ari L. Zaiman, Amy F. Lewis, Barbara E. Crute, N. A. Speck, Jack Lenz
Dartmouth Scholarship
Core binding factor (CBF), also known as polyomavirus enhancer-binding protein 2 and SL3 enhancer factor 1, is a mammalian transcription factor that binds to an element termed the core within the enhancers of the murine leukemia virus family of retroviruses. The core elements of the SL3 virus are important genetic determinants of the ability of this virus to induce T-cell lymphomas and the transcriptional activity of the viral long terminal repeat in T lymphocytes. CBF consists of two subunits, a DNA binding subunit, CBF alpha, and a second subunit, CBF beta, that stimulates the DNA binding activity of CBF alpha. …
Tumor Necrosis Factor Alpha-Induced Apoptosis In Human Neuronal Cells: Protection By The Antioxidant N-Acetylcysteine And The Genes Bcl-2 And Crma, Angela K. Talley, Stephen Dewhurst, Seth W. Perry, Sheila C. Dollard, Suryaram Gummuluru, Steven M. Fine, Deborah New, Leon Epstein, Howard Gendelman, Harris A. Gelbard
Tumor Necrosis Factor Alpha-Induced Apoptosis In Human Neuronal Cells: Protection By The Antioxidant N-Acetylcysteine And The Genes Bcl-2 And Crma, Angela K. Talley, Stephen Dewhurst, Seth W. Perry, Sheila C. Dollard, Suryaram Gummuluru, Steven M. Fine, Deborah New, Leon Epstein, Howard Gendelman, Harris A. Gelbard
Nebraska Center for Virology: Faculty Publications
Tumor necrosis factor alpha (TNF-α) is a candidate human immunodeficiency virus type 1-induced neurotoxin that contributes to the pathogenesis of AIDS dementia complex. We report here on the effects of exogenous TNF-α on SK-N-MC human neuroblastoma cells differentiated to a neuronal phenotype with retinoic acid. TNF-α caused a dose-dependent loss of viability and a corresponding increase in apoptosis in differentiated SK-N-MC cells but not in undifferentiated cultures. Importantly, intracellular signalling via TNF receptors, as measured by activation of the transcription factor NF-kB, was unaltered by retinoic acid treatment. Finally, overexpression of bcl-2 or crmA conferred resistance to apoptosis mediated by …
Phylogenetic Diversity Of The Bacterial Community From A Microbial Mat At An Active, Hydrothermal Vent System, Loihi Seamount, Hawaii, Craig L. Moyer, Fred C. Dobbs, David M. Karl
Phylogenetic Diversity Of The Bacterial Community From A Microbial Mat At An Active, Hydrothermal Vent System, Loihi Seamount, Hawaii, Craig L. Moyer, Fred C. Dobbs, David M. Karl
OES Faculty Publications
The phylogenetic diversity of small-subunit rRNA genes associated,vith the domain Bacteria was examined (by using previously defined operational taxonomic units [C. L. Moyer, F. C. Dobbs, and D. M. Karl, Appl. Environ. Microbiol. 60:871-879, 1994]; those for Pele's Vents Bacteria are hereafter abbreviated PVB OTUs) with samples from a microbial mat at an active, deep-sea hydrothermal vent system. A cluster of phylogenetically related PVB OTUs (OTUs 2, 3, 6, and 8) was closely affiliated with Thiovulum sp. contained within the epsilon subclass of the class Proteobacteria and accounted for 60.5% of the small-subunit rRNA bacterial clone library from Pele's Vents. …
Strain-Dependent Variation In Carbon Source Regulation Of Nucleus-Encoded Mitochondrial Proteins Of Saccharomyces Cerevisiae., Timothy A. Brown, Bernard L. Trumpower
Strain-Dependent Variation In Carbon Source Regulation Of Nucleus-Encoded Mitochondrial Proteins Of Saccharomyces Cerevisiae., Timothy A. Brown, Bernard L. Trumpower
Dartmouth Scholarship
Nuclear genes encoding mitochondrial proteins are regulated by carbon source with significant heterogeneity among four Saccharomyces cerevisiae strains. This strain-dependent variation is seen both in respiratory capacity of the cells and in the expression of beta-galactosidase reporter fusions to the promoters of CYB2, CYC1, CYC3, MnSOD, and RPO41.
Microwave Oven--Not Only For Cooking, S Pervez
Microwave Oven--Not Only For Cooking, S Pervez
Department of Pathology and Laboratory Medicine
No abstract provided.
Enhancer Trap Technique: A Novel Tool For Identification And Developmental Characterization Of Genes Of Drosophila, Amit Singh
Biology Faculty Publications
The classical technique of mutational screen for identification of genes controlling early development has now approached saturation. A new era in genetic identification and developmental characterization of genes in Drosophila has commenced with the advent of the enhancer trap technique. This technique involves mobilization of a P-lacZ vector to diverse chromosomal locations in the fruit fly genome to bring it under the regulation of developmentally expressed genes or their enhancer elements. The technique offers a strikingly elegant method of gaining entry into fruit fly genes.
A Novel Translational Regulation Function For The Simian Virus 40 Large-T Antigen Gene., Prithi Rajan, Sathyamagalam Swaminathan, Jiyue Zhu, Charles N. Cole
A Novel Translational Regulation Function For The Simian Virus 40 Large-T Antigen Gene., Prithi Rajan, Sathyamagalam Swaminathan, Jiyue Zhu, Charles N. Cole
Dartmouth Scholarship
Cells use the interferon-induced, double-stranded-RNA-dependent protein kinase PKR as a defense against virus infections. Upon activation, PKR phosphorylates and thereby inactivates the protein synthesis initiation factor eIF-2, resulting in the cessation of protein synthesis. Viruses have evolved various strategies to counteract this cellular defense. In this paper, we show that simian virus 40 (SV40) large-T antigen can antagonize the translational inhibitory effect resulting from the activation of PKR in virus-infected cells. Unlike the situation with other virus-host cell interactions, SV40 large-T antigen does not block the activation of PKR, suggesting that SV40 counteracts the cellular antiviral response mediated by PKR …
An Improved Method For Chemical Devitellinization Of X-Gal Stained Drosophila Embryos, Amit Singh, Madhuri Kango-Singh, P. Sinha
An Improved Method For Chemical Devitellinization Of X-Gal Stained Drosophila Embryos, Amit Singh, Madhuri Kango-Singh, P. Sinha
Biology Faculty Publications
In Drosophila developmental biological studies, X-gal staining is commonly employed to study the spatio-temporal expression of the lacZ reporter gene in the transformed flies or their embryos. Study of the lacZ pattern in embryos often suffers from the lack of an efficient and high yieldirrg technique for devitellinization of X-gal stained embryos. Devitellinization techniques employed during antibody staining, in situ hybridization or embryonic cuticular preparations generally do not give satisfactory results when used for similar purpose in X-gal stained embryos. This results in the flaky appearance of the blue stain. We present here an improved chemical devitellinization technique which gives …
Autoregulated Expression Of The Yeast Ino2 And Ino4 Helix-Loop-Helix Genes Effects Cooperative Regulation On Their Target Genes, John Lopes, B. Ashburner
Autoregulated Expression Of The Yeast Ino2 And Ino4 Helix-Loop-Helix Genes Effects Cooperative Regulation On Their Target Genes, John Lopes, B. Ashburner
Microbiology Department Faculty Publication Series
In the yeast Saccharomyces cerevisiae, the phospholipid biosynthetic genes are highly regulated at the transcriptional level in response to the phospholipid precursors inositol and choline. In the absence of inositol and choline (derepressing), the products of the INO2 and INO4 genes form a heteromeric complex which binds to a 10-bp element, upstream activation sequence INO (UASINO), in the promoters of the phospholipid biosynthetic genes to activate their transcription. In the presence of inositol and choline (repressing), the product of the OPI1 gene represses transcription dictated by the UASINO element. Curiously, we identified a UASINO-like element in the promoters of both …
Cyanonews (Vol. 11, No. 2, July 1995), Jeff Elhai
Cyanonews (Vol. 11, No. 2, July 1995), Jeff Elhai
CyanoNews
CyanoNews was a newsletter that served the cyanobacteriological community from 1985 to 2003, with content provided by readers (sort of a blog before there were blogs). The newsletter reported new findings from the lab, summaries of recent meetings (often provided by graduate students and post-docs entering the field), positions sought or available, life transitions, a compendium of recent cyanobacteria-related articles, and other items of interest to those who study cyanobacteria.
Cyanonews (Vol. 11, No. 1, February 1995), Jeff Elhai
Cyanonews (Vol. 11, No. 1, February 1995), Jeff Elhai
CyanoNews
CyanoNews was a newsletter that served the cyanobacteriological community from 1985 to 2003, with content provided by readers (sort of a blog before there were blogs). The newsletter reported new findings from the lab, summaries of recent meetings (often provided by graduate students and post-docs entering the field), positions sought or available, life transitions, a compendium of recent cyanobacteria-related articles, and other items of interest to those who study cyanobacteria.
Biotransformation Of Bile Acids, Cholesterol And Steroids. Chapter 13 In: The Ecology And Physiology Of Gastrointestinal Microbes. Vol. 1, New York, Chapman And Hall., Stephen Baron, Phillip B. Hylemon
Biotransformation Of Bile Acids, Cholesterol And Steroids. Chapter 13 In: The Ecology And Physiology Of Gastrointestinal Microbes. Vol. 1, New York, Chapman And Hall., Stephen Baron, Phillip B. Hylemon
Biology Faculty Scholarship
No abstract provided.
Media Components Influence Viral Gene Expression Assays In Human Fetal Astrocyte Cultures, Micheline Mccarthy, Charles Wood, Larisa Fedoseyeva, Scott R. Whittemore
Media Components Influence Viral Gene Expression Assays In Human Fetal Astrocyte Cultures, Micheline Mccarthy, Charles Wood, Larisa Fedoseyeva, Scott R. Whittemore
Nebraska Center for Virology: Faculty Publications
In vitro neurovirological studies of viral infectivity or viral gene expression may be confounded by the mulHple neural cell types and/or fibrob last contamination present in early passage cultures prepared from dissociated human central nervous system (eNS) tissue. We have developed highly enriched astrocyte cultures for neurovirological study by culturing in a serum-free defined medium, 816, supplemented with basic fibroblast growth factor (FGF-2). Subculture in this medium selects against fibroblast proliferation and favors sustained proliferation of a highly enriched glial fibrillary acidic protein (GFAP)-positive cell population. These astrocytes support productive replication of cytomegalovirus (CMV) and transient expression of transfected CMVand …
Seroprevalence Of Toxoplasma Gondii In Domestic Animals In Pakistan, M Zaki
Seroprevalence Of Toxoplasma Gondii In Domestic Animals In Pakistan, M Zaki
Department of Pathology and Laboratory Medicine
The seroprevalence of Toxoplasma gondii infections among food animals in South-West Pakistan was measured by serological examination using a commercial latex agglutination test (LAT). In all 262 blood samples, from 100 cattle, 40 sheep, 58 goats and 64 chickens, were collected from the city abattoir. Titers considered diagnostically significant (> or = 1:64) were detected in 25% of cattle and 2.5% of sheep. None of the goats and chickens presented seropositivity for anti-toxoplasma antibodies. The study suggests the need for further investigations to determine the impact of these findings on the human population.
Hyla Albopunctata, Rafael O. De Sá
Hyla Albopunctata, Rafael O. De Sá
Biology Faculty Publications
Hyla albopunctata is a medium-sized species in the albopunctata group, adults range in size from 42-52 mm SVL (males average 47 mm and females 49 mm). The head is triangular in outline, always longer than wide. The snout is moderately long and acuminate in dorsal view, whereas in lateral view, it is acuminate and protrudes beyond the mandible to form an angle of 45 degrees over the mandible. The canthus rostralis is rounded and distinct, the loreal region is slightly concave, and the internarial region is slightly convex. The eyes are large, approximately twice the diameter of the tympanum. The …