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Chemical Attraction Of Dermacentor Variabilis Ticks Parasitic To Peromyscus Leucopus Based On Host Body Mass And Sex, Tad Dallas, Stephanie Foré Oct 2013

Chemical Attraction Of Dermacentor Variabilis Ticks Parasitic To Peromyscus Leucopus Based On Host Body Mass And Sex, Tad Dallas, Stephanie Foré

Faculty Publications

Macroparasites are commonly aggregated on a small subset of a host population. Previous explanations for this aggregation relate to differences in immunocompetence or the degree to which hosts encounter parasites. We propose active tick host choice through chemical attraction as a potential mechanism leading to aggregated tick burdens. We test this hypothesis using a Y-maze olfactometer, comparing chemical attraction responses of larval and nymphal Dermacentor variabilis ticks parasitic to the white-footed mouse, Peromyscus leucopus, as a function of host sex and host body mass. We hypothesized that larger hosts and male hosts would be most attractive to searching ticks, as …

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Social Descent With Territory Loss Causes Rapid Behavioral, Endocrine And Transcriptional Changes In The Brain, Karen P. Maruska, Lisa Becker, Anoop Neboori, Russell D. Fernald Oct 2013

Social Descent With Territory Loss Causes Rapid Behavioral, Endocrine And Transcriptional Changes In The Brain, Karen P. Maruska, Lisa Becker, Anoop Neboori, Russell D. Fernald

Faculty Publications

In social species that form hierarchies where only dominant males reproduce, lower-ranking individuals may challenge higherranking ones, often resulting in changes in relative social status. How does a losing animal respond to loss of status? Here, using the African cichlid fish Astatotilapia burtoni, we manipulated the social environment, causing males to descend in rank, and then examined changes in behavior, circulating steroids and immediate early gene (IEG) expression (cfos, egr-1) in micro-dissected brain regions as a proxy for neuronal activation. In particular, we examined changes in the conserved 'social behavior network' (SBN), a collection of brain nuclei known to regulate …

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Lsu Research Fall 2013, Louisiana State University And Agricultural & Mechanical College Oct 2013

Lsu Research Fall 2013, Louisiana State University And Agricultural & Mechanical College

Research Magazine

LSU Research is published annually by the Office of Research & Economic Development, Louisiana State University.

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Silencing Histone Deacetylase-Specific Isoforms Enhances Expression Of Pluripotency Genes In Bovine Fibroblasts, Jaroslaw Staszkiewicz, Rachel A. Power, Lettie L. Harkins, Christian W. Barnes, Karen L. Strickler, Jong S. Rim, Kenneth R. Bondioli, Kenneth J. Eilersten Oct 2013

Silencing Histone Deacetylase-Specific Isoforms Enhances Expression Of Pluripotency Genes In Bovine Fibroblasts, Jaroslaw Staszkiewicz, Rachel A. Power, Lettie L. Harkins, Christian W. Barnes, Karen L. Strickler, Jong S. Rim, Kenneth R. Bondioli, Kenneth J. Eilersten

Faculty Publications

Histone deacetylases (HDACs) catalyze deacetylation of histones that results in altered transcriptional activity. Inhibitors of HDACs have been shown to induce transcriptional changes that contribute positively to reprogramming somatic cells either by nuclear transfer or inducing a pluripotent state. However, the exact molecular mechanisms whereby HDAC inhibitors function and the specificity of the HDAC isoforms in cell reprogramming are not yet fully understood. Herein, we report the ability of individual isoform-specific HDACs to modulate endogenous expression of pluripotency-associated genes in bovine somatic cells. This in vitro study showed that a transient selective depletion of HDACs resulted in elevated mRNA levels …

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Louisiana Agriculture Fall, 2013 Oct 2013

Louisiana Agriculture Fall, 2013

Louisiana Agriculture

No abstract provided.

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Triacylglycerol Mobilization Is Suppressed By Brefeldin A In Chlamydomonas Reinhardtii, Naohiro Kato, Trung Dong, Michael Bailey, Tony Lum, Drury Ingram Oct 2013

Triacylglycerol Mobilization Is Suppressed By Brefeldin A In Chlamydomonas Reinhardtii, Naohiro Kato, Trung Dong, Michael Bailey, Tony Lum, Drury Ingram

Faculty Publications

Brefeldin A suppresses vesicle trafficking by inhibiting exchange of GDP for GTP in ADP-ribosylation factor. We report that brefeldin A suppresses mobilization of triacylglycerols in Chlamydomonas reinhardtii, a model organism of green microalgae. Analyses revealed that brefeldin A causes Chlamydomonas to form lipid droplets in which triacylglycerols accumulate in a dose-dependent manner. Pulse labeling experiment using fluorescent fatty acids suggested that brefeldin A inhibits the cells from degrading fatty acids. The experiment also revealed that the cells transiently form novel compartments that accumulate exogenously added fatty acids in the cytoplasm, designated fatty acid-induced microbodies (FAIMs). Brefeldin A up-regulates the formation …

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Homologous Rig-I-Like Helicase Proteins Direct Rnaimediated Antièiral Immunity In C. Elegans By Distinct Mechanisms, Xunyang Guo, Rui Zhang, Jeffrey Wang, Shou Wei Ding, Rui Lu Oct 2013

Homologous Rig-I-Like Helicase Proteins Direct Rnaimediated Antièiral Immunity In C. Elegans By Distinct Mechanisms, Xunyang Guo, Rui Zhang, Jeffrey Wang, Shou Wei Ding, Rui Lu

Faculty Publications

RNAi-mediated antièiral immunity in Caenorhabditis elegans requires Dicer-related helicase 1 (DRH-1), which encodes the helicase and C-terminal domains homologous to the mammalian retinoic acid inducible gene I (RIG-I)-like helicase (RLH) family of cytosolic immune receptors. Here we show that the antièiral function of DRH-1 requires the RIG-I homologous domains as well as its wormspecific N-terminal domain. We also demonstrate that the helicase and C-terminal domains encoded by either worm DRH-2 or human RIG-I can functionally replace the corresponding domains of DRH-1 to mediate antièiral RNAi in C. elegans. Notably, substitutions in a three-residue motif of the C-terminal regulatory domain of …

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The Size Of A Melanin-Based Plumage Ornament Correlates With Glucocorticoid Receptor Concentrations In The Skin Of That Ornament, Christine R. Lattin, L. Michael Romero Sep 2013

The Size Of A Melanin-Based Plumage Ornament Correlates With Glucocorticoid Receptor Concentrations In The Skin Of That Ornament, Christine R. Lattin, L. Michael Romero

Faculty Publications

© 2013 The Author(s) Published by the Royal Society. All rights reserved. Glucocorticoid hormones such as corticosterone (CORT) play crucial roles in many physiological processes. CORT's actions are primarily mediated via binding to two receptors (glucocorticoid receptors (GRs) and mineralocorticoid receptors (MRs)) in different target tissues. CORT receptors can be independently regulated from circulating hormone titres, from tissue to tissue and even within different regions of the same tissue type. Increasing evidence has shown relationships between circulating CORT and melaninbased pigmentation in skin and feathers, yet to our knowledge, there have been no studies of CORT receptors in the skin …

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A New Hero Emerges: Another Exceptional Mammalian Spine And Its Potential Adaptive Significance, William T. Stanley, Lynn W. Robbins, Jean M. Malekani, Sylvestre Gambalemoke Mbalitini, Dudu Akaibe Migurimu, Jean Claude Mukinzi, Jan Hulselmans, Vanya Prévot, Erik Verheyen, Rainer Hutterer, Jeffrey B. Doty, Benjamin P. Monroe, Yoshinori J. Nakazawa, Zachary Braden, Darin Carroll, Julian C.Kerbis Peterhans, John M. Bates, Jacob A. Esselstyn Sep 2013

A New Hero Emerges: Another Exceptional Mammalian Spine And Its Potential Adaptive Significance, William T. Stanley, Lynn W. Robbins, Jean M. Malekani, Sylvestre Gambalemoke Mbalitini, Dudu Akaibe Migurimu, Jean Claude Mukinzi, Jan Hulselmans, Vanya Prévot, Erik Verheyen, Rainer Hutterer, Jeffrey B. Doty, Benjamin P. Monroe, Yoshinori J. Nakazawa, Zachary Braden, Darin Carroll, Julian C.Kerbis Peterhans, John M. Bates, Jacob A. Esselstyn

Faculty Publications

The hero shrew's (Scutisorex somereni) massive interlocking lumbar vertebrae represent the most extreme modification of the vertebral column known in mammals. No intermediate form of this remarkable morphology is known, nor is there any convincing theory to explain its functional significance. We document a new species in the heretofore monotypic genus Scutisorex; the new species possesses cranial and vertebral features representing intermediate character states between S. somereni and other shrews. Phylogenetic analyses of DNA sequences support a sister relationship between the new species and S. somereni. While the function of the unusual spine in Scutisorex is unknown, it gives these …

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Ascaroside Activity In Caenorhabditis Elegans Is Highly Dependent On Chemical Structure, Kyle A. Hollister, Elizabeth S. Conner, Xinxing Zhang, Mark Spell, Gary M. Bernard, Pratik Patel, Ana Carolina G.V. De Carvalho, Rebecca A. Butcher, Justin R. Ragains Sep 2013

Ascaroside Activity In Caenorhabditis Elegans Is Highly Dependent On Chemical Structure, Kyle A. Hollister, Elizabeth S. Conner, Xinxing Zhang, Mark Spell, Gary M. Bernard, Pratik Patel, Ana Carolina G.V. De Carvalho, Rebecca A. Butcher, Justin R. Ragains

Faculty Publications

The nematode Caenorhabditis elegans secretes ascarosides, structurally diverse derivatives of the 3,6-dideoxysugar ascarylose, and uses them in chemical communication. At high population densities, specific ascarosides, which are together known as the dauer pheromone, trigger entry into the stress-resistant dauer larval stage. In order to study the structure-activity relationships for the ascarosides, we synthesized a panel of ascarosides and tested them for dauer-inducing activity. This panel includes a number of natural ascarosides that were detected in crude pheromone extract, but as yet have no assigned function, as well as many unnatural ascaroside derivatives. Most of these ascarosides, some of which have …

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Identification Of An Evolutionarily Conserved Cis-Regulatory Element Controlling The Peg3 Imprinted Domain, Michelle M. Thiaville, Hana Kim, Wesley D. Frey, Joomyeong Kim Sep 2013

Identification Of An Evolutionarily Conserved Cis-Regulatory Element Controlling The Peg3 Imprinted Domain, Michelle M. Thiaville, Hana Kim, Wesley D. Frey, Joomyeong Kim

Faculty Publications

The mammalian Peg3 domain harbors more than 20 evolutionarily conserved regions (ECRs) that are spread over the 250-kb genomic interval. The majority of these ECRs are marked with two histone modifications, H3K4me1 and H3K27ac, suggesting potential roles as distant regulatory elements for the transcription of the nearby imprinted genes. In the current study, the chromatin conformation capture (3C) method was utilized to detect potential interactions of these ECRs with the imprinted genes. According to the results, one region, ECR18, located 200-kb upstream of Peg3 interacts with the two promoter regions of Peg3 and Zim2. The observed interaction is most prominent …

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A Review Of Vaccine Approaches For West Nile Virus, Arun V. Iyer, Konstantin G. Kousoulas Sep 2013

A Review Of Vaccine Approaches For West Nile Virus, Arun V. Iyer, Konstantin G. Kousoulas

Faculty Publications

The West Nile virus (WNC) first appeared in North America in 1999. The North American lineages of WNV were characterized by the presence of neuroinvasive and neurovirulent strains causing disease and death in humans, birds and horses. The 2012 WNV season in the United States saw a massive spike in the number of neuroinvasive cases and deaths similar to what was seen in the 2002-2003 season, according to the West Nile virus disease cases and deaths reported to the CDC by year and clinical presentation, 1999-2012, by ArboNET (Arboviral Diseases Branch, Centers for Disease Control and Prevention). In addition, the …

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Induced Plant Defenses, Host-Pathogen Interactions, And Forest Insect Outbreaks, Bret D. Elderd, Brian J. Rehill, Kyle J. Haynes, Greg Dwyer Sep 2013

Induced Plant Defenses, Host-Pathogen Interactions, And Forest Insect Outbreaks, Bret D. Elderd, Brian J. Rehill, Kyle J. Haynes, Greg Dwyer

Faculty Publications

Cyclic outbreaks of defoliating insects devastate forests, but their causes are poorly understood. Outbreak cycles are often assumed to be driven by density-dependent mortality due to natural enemies, because pathogens and predators cause high mortality and because natural-enemy models reproduce fluctuations in defoliation data. The role of induced defenses is in contrast often dismissed, because toxic effects of defenses are often weak and because induced-defense models explain defoliation data no better than naturalenemy models. Natural-enemy models, however, fail to explain gypsy moth outbreaks in North America, in which outbreaks in forests with a higher percentage of oaks have alternated between …

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Dynamic Edge Effects In Small Mammal Communities Across A Conservation-Agricultural Interface In Swaziland, Zachary M. Hurst, Robert A. Mccleery, Bret A. Collier, Robert J. Fletcher, Nova J. Silvy, Peter J. Taylor, Ara Monadjem Sep 2013

Dynamic Edge Effects In Small Mammal Communities Across A Conservation-Agricultural Interface In Swaziland, Zachary M. Hurst, Robert A. Mccleery, Bret A. Collier, Robert J. Fletcher, Nova J. Silvy, Peter J. Taylor, Ara Monadjem

Faculty Publications

Across the planet, high-intensity farming has transformed native vegetation into monocultures, decreasing biodiversity on a landscape scale. Yet landscape-scale changes to biodiversity and community structure often emerge from processes operating at local scales. One common process that can explain changes in biodiversity and community structure is the creation of abrupt habitat edges, which, in turn, generate edge effects. Such effects, while incredibly common, can be highly variable across space and time; however, we currently lack a general analytical framework that can adequately capture such spatio-temporal variability. We extend previous approaches for estimating edge effects to a non-linear mixed modeling framework …

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Evaluation Of 54 Years Of Centralized Performance Bull Testing At The Dean Lee Research And Extension Center (Bulletin #893), Tabitha Howard, Matthew Garcia, Kenneth Bondioli, Sidney Derouen Sep 2013

Evaluation Of 54 Years Of Centralized Performance Bull Testing At The Dean Lee Research And Extension Center (Bulletin #893), Tabitha Howard, Matthew Garcia, Kenneth Bondioli, Sidney Derouen

LSU AgCenter Bulletins

The first objective of this study was to evaluate 54 years of performance data to analyze performance trends from a centralized performance bull testing program conducted in central Louisiana. The second objective was to discuss how changes in performance trends observed in the Dean Lee Performance Bull Tests compare to other multidecade bull performance tests.

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Habitat Filtering Across Tree Life Stages In Tropical Forest Communities, C. A. Baldeck, K. E. Harms, J. B. Yavitt, R. John, B. L. Turner, R. Valencia, H. Navarrete, S. Bunyavejchewin, S. Kiratiprayoon, A. Yaacob, M. N.N. Supardi, S. J. Davies, S. P. Hubbell, G. B. Chuyong, D. Kenfack, D. W. Thomas, J. W. Dalling Aug 2013

Habitat Filtering Across Tree Life Stages In Tropical Forest Communities, C. A. Baldeck, K. E. Harms, J. B. Yavitt, R. John, B. L. Turner, R. Valencia, H. Navarrete, S. Bunyavejchewin, S. Kiratiprayoon, A. Yaacob, M. N.N. Supardi, S. J. Davies, S. P. Hubbell, G. B. Chuyong, D. Kenfack, D. W. Thomas, J. W. Dalling

Faculty Publications

Tropical tree communities are shaped by local-scale habitat heterogeneity in the form of topographic and edaphic variation, but the life-history stage at which habitat associations develop remains poorly understood. This is due, in part, to the fact that previous studies have not accounted for the widely disparate sample sizes number of stems that result when trees are divided into size classes. We demonstrate that the observed habitat structuring of a community is directly related to the number of individuals in the community. We then compare the relative importance of habitat heterogeneity to tree community structure for saplings, juveniles and adult …

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Natural Variation And The Capacity To Adapt To Ocean Acidification In The Keystone Sea Urchin Strongylocentrotus Purpuratus, Morgan W. Kelly, Jacqueline L. Padilla-Gamiño, Gretchen E. Hofmann Aug 2013

Natural Variation And The Capacity To Adapt To Ocean Acidification In The Keystone Sea Urchin Strongylocentrotus Purpuratus, Morgan W. Kelly, Jacqueline L. Padilla-Gamiño, Gretchen E. Hofmann

Faculty Publications

A rapidly growing body of literature documents the potential negative effects of CO2-driven ocean acidification (OA) on marine organisms. However, nearly all this work has focused on the effects of future conditions on modern populations, neglecting the role of adaptation. Rapid evolution can alter demographic responses to environmental change, ultimately affecting the likelihood of population persistence, but the capacity for adaptation will differ among populations and species. Here, we measure the capacity of the ecologically important purple sea urchin Strongylocentrotus purpuratus to adapt to OA, using a breeding experiment to estimate additive genetic variance for larval size (an important component …

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Adaptation And The Physiology Of Ocean Acidification, Morgan W. Kelly, Gretchen E. Hofmann Aug 2013

Adaptation And The Physiology Of Ocean Acidification, Morgan W. Kelly, Gretchen E. Hofmann

Faculty Publications

Ocean acidification, caused by the uptake of atmospheric CO2, is a threat to marine biodiversity, potentially rivalling the threat imposed by rising temperatures in some marine ecosystems. Although a growing body of literature documents negative effects of acidification on marine organisms, the majority of this work has focused on the effects of future conditions on modern populations, ignoring the potential effects of adaptation and physiological acclimatization. We review current literature on the potential for adaptation to elevated pCO2 in marine organisms. Although this body of work is currently quite small, we argue that data on the physiological effects of acidification, …

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Population Dynamics Of Three Aphid Species (Hemiptera: Aphididae) On Four Ipomoea Spp. Infected Or Noninfected With Sweetpotato Potyviruses, E. N. Wosula, J. A. Davis, C. A. Clark Aug 2013

Population Dynamics Of Three Aphid Species (Hemiptera: Aphididae) On Four Ipomoea Spp. Infected Or Noninfected With Sweetpotato Potyviruses, E. N. Wosula, J. A. Davis, C. A. Clark

Faculty Publications

Three aphid species, Aphis gossypii Glover and Myzus persicae (Sulzer) (efficient sweetpotato potyvirus vectors) and Rhopalosiphum padi (L.) (an inefficient vector), are commonly found in sweet potato, Ipomoea batatas (L.), in Louisiana. Field-grown sweet potatoes are naturally infected with several potyviruses: Sweet potato feathery mottle virus, Sweet potato virus G, and Sweet potato virus 2. Thus, these aphids commonly encounter virus-infected hosts. What is not known is how each of these aphids responds to sweet potato, either infected or virus-free. The objectives of this study were to 1) determine if these aphid species can colonize mixed virus-infected sweet potato 'Beau-regard', …

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Host-Microbe Interactions In Caenorhabditis Elegans, Rui Zhang, Aixin Hou Aug 2013

Host-Microbe Interactions In Caenorhabditis Elegans, Rui Zhang, Aixin Hou

Faculty Publications

No abstract provided.

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Genetic Analysis Of Population Structure And Reproductive Mode Of The Termite Reticulitermes Chinensis Snyder, Qiuying Huang, Ganghua Li, Claudia Husseneder, Chaoliang Lei Jul 2013

Genetic Analysis Of Population Structure And Reproductive Mode Of The Termite Reticulitermes Chinensis Snyder, Qiuying Huang, Ganghua Li, Claudia Husseneder, Chaoliang Lei

Faculty Publications

The subterranean termite Reticulitermes chinensis Snyder is an important pest of trees and buildings in China. Here, we characterized genetic structure and reproductive modes of R. chinensis from China for the first time. A total of 1,875 workers from 75 collection sites in Huanggang, Changsha and Chongqing cities were genotyped at eight microsatellite loci. Analysis of genetic clusters showed two subpopulations in Chongqing city. The Huanggang population showed a uniform genetic pattern and was separated from the other populations by the largest genetic distances (FST: 0.17-0.20). In contrast, smaller genetic distances (FST: 0.05-0.12) separated Changsha, Chongqing-1 and Chongqing-2 populations. Chongqing-1 …

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Maternal Exposure To Combustion Generated Pm Inhibits Pulmonary Th1 Maturation And Concomitantly Enhances Postnatal Asthma Development In Offspring, Pingli Wang, Dahui You, Jordy Saravia, Huahao Shen, Stephania A. Cormier Jul 2013

Maternal Exposure To Combustion Generated Pm Inhibits Pulmonary Th1 Maturation And Concomitantly Enhances Postnatal Asthma Development In Offspring, Pingli Wang, Dahui You, Jordy Saravia, Huahao Shen, Stephania A. Cormier

Faculty Publications

Background: Epidemiological studies suggest that maternal exposure to environmental hazards, such as particulate matter, is associated with increased incidence of asthma in childhood. We hypothesized that maternal exposure to combustion derived ultrafine particles containing persistent free radicals (MCP230) disrupts the development of the infant immune system and results in aberrant immune responses to allergens and enhances asthma severity.Methods: Pregnant C57/BL6 mice received MCP230 or saline by oropharyngeal aspiration on gestational days 10 and 17. Three days after the second administration, blood was collected from MCP230 or saline treated dams and 8-isoprostanes in the serum were measured to assess maternal oxidative …

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Transcriptional Profiling Of Sweetpotato (Ipomoea Batatas) Roots Indicates Down-Regulation Of Lignin Biosynthesis And Up-Regulation Of Starch Biosynthesis At An Early Stage Of Storage Root Formation, Nurit Firon, Don Labonte, Arthur Villordon, Yanir Kfir, Julio Solis, Evgenia Lapis, Temima Schnitzer Perlman, Adi Doron-Faigenboim, Amots Hetzroni, Leviah Althan, Lahan Adani Nadir Jul 2013

Transcriptional Profiling Of Sweetpotato (Ipomoea Batatas) Roots Indicates Down-Regulation Of Lignin Biosynthesis And Up-Regulation Of Starch Biosynthesis At An Early Stage Of Storage Root Formation, Nurit Firon, Don Labonte, Arthur Villordon, Yanir Kfir, Julio Solis, Evgenia Lapis, Temima Schnitzer Perlman, Adi Doron-Faigenboim, Amots Hetzroni, Leviah Althan, Lahan Adani Nadir

Faculty Publications

Background: The number of fibrous roots that develop into storage roots determines sweetpotato yield. The aim of the present study was to identify the molecular mechanisms involved in the initiation of storage root formation, by performing a detailed transcriptomic analysis of initiating storage roots using next-generation sequencing platforms. A two-step approach was undertaken: (1) generating a database for the sweetpotato root transcriptome using 454-Roche sequencing of a cDNA library created from pooled samples of two root types: fibrous and initiating storage roots; (2) comparing the expression profiles of initiating storage roots and fibrous roots, using the Illumina Genome Analyzer to …

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Herpes Simplex Virus 1 Glycoprotein M And The Membrane-Associated Protein Ul11 Are Required For Virus-Induced Cell Fusion And Efficient Virus Entry, In Joong Kim, Vladimir N. Chouljenko, Jason D. Walker, Konstantin G. Kousoulas Jul 2013

Herpes Simplex Virus 1 Glycoprotein M And The Membrane-Associated Protein Ul11 Are Required For Virus-Induced Cell Fusion And Efficient Virus Entry, In Joong Kim, Vladimir N. Chouljenko, Jason D. Walker, Konstantin G. Kousoulas

Faculty Publications

Herpes simplex virus 1 (HSV-1) facilitates virus entry into cells and cell-to-cell spread by mediating fusion of the viral envelope with cellular membranes and fusion of adjacent cellular membranes. Although virus strains isolated from herpetic lesions cause limited cell fusion in cell culture, clinical herpetic lesions typically contain large syncytia, underscoring the importance of cellto-cell fusion in virus spread in infected tissues. Certain mutations in glycoprotein B (gB), gK, UL20, and other viral genes drastically enhance virus-induced cell fusion in vitro and in vivo. Recent work has suggested that gB is the sole fusogenic glycoprotein, regulated by interactions with the …

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Louisiana Agriculture Summer, 2013 Jul 2013

Louisiana Agriculture Summer, 2013

Louisiana Agriculture

No abstract provided.

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Initial Epidemic Area Is Strongly Associated With The Yearly Extent Of Soybean Rust Spread In North America, Christopher C. Mundt, La Rae D. Wallace, Tom W. Allen, Clayton A. Hollier, Robert C. Kemerait, Edward J. Sikora Jul 2013

Initial Epidemic Area Is Strongly Associated With The Yearly Extent Of Soybean Rust Spread In North America, Christopher C. Mundt, La Rae D. Wallace, Tom W. Allen, Clayton A. Hollier, Robert C. Kemerait, Edward J. Sikora

Faculty Publications

Hosts of soybean rust (Phakopsora pachyrhizi) are sensitive to low temperatures, limiting this obligate parasite in the United States to overwintering sites in a restricted area along the Gulf Coast. This temperature sensitivity of soybean rust hosts allowed us to study spatial spread of epidemic invasions over similar territory for seven sequential years, 2005-2011. The epidemic front expanded slowly from early April through July, with the majority of expansion occurring from August through November. There was a 7.4-fold range of final epidemic extent (0.4-3.0 million km2) from the year of smallest final disease extent (2011) to that of the largest …

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Il-4rα On Cd4+ T Cells Plays A Pathogenic Role In Respiratory Syncytial Virus Reinfection In Mice Infected Initially As Neonates, Dahui You, Nico Marr, Jordy Saravia, Bishwas Shrestha, Greg I. Lee, Stuart E. Turvey, Frank Brombacher, De'broski R. Herbert, Stephania A. Cormier Jun 2013

Il-4rα On Cd4+ T Cells Plays A Pathogenic Role In Respiratory Syncytial Virus Reinfection In Mice Infected Initially As Neonates, Dahui You, Nico Marr, Jordy Saravia, Bishwas Shrestha, Greg I. Lee, Stuart E. Turvey, Frank Brombacher, De'broski R. Herbert, Stephania A. Cormier

Faculty Publications

RSV is the major cause of severe bronchiolitis in infants, and severe bronchiolitis as a result of RSV is associated with subsequent asthma development. A biased Th2 immune response is thought to be responsible for neonatal RSV pathogenesis; however, molecular mechanisms remain elusive. Our data demonstrate, for the first time, that IL-4Rα is up-regulated in vitro on human CD4+ T cells from cord blood following RSV stimulation and in vivo on mouse pulmonary CD4+ T cells upon reinfection of mice, initially infected as neonates. Th cell-specific deletion of Il4ra attenuated Th2 responses and abolished the immunopathophysiology upon reinfection, including airway …

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Minimizing Human Infection From Escherichia Coli O157:H7 Using Gumbos, Marsha R. Cole, Min Li, Ravirajsinh Jadeja, Bilal El-Zahab, Daniel Hayes, Jeffery A. Hobden, Marlene E. Janes, Isiah M. Warner Jun 2013

Minimizing Human Infection From Escherichia Coli O157:H7 Using Gumbos, Marsha R. Cole, Min Li, Ravirajsinh Jadeja, Bilal El-Zahab, Daniel Hayes, Jeffery A. Hobden, Marlene E. Janes, Isiah M. Warner

Faculty Publications

Objectives: Reduction in faecal shedding of Shiga toxin-producing enterohaemorrhagic Escherichia coli (EHEC) in food-producing animals is a viable strategy to minimize human disease initiated by exposure to these microorganisms. To this end, an intervention strategy involving the electrostatic hybridization of two commonly used anti-infective agents for veterinary practice (i.e. chlorhexidine and ampicillin) was evaluated to curtail EHECtransmitted disease from ruminant sources. Chlorhexidine di-ampicillin is a novel group of uniform material based on organic salts (GUMBOS) with inherent in vitro antibacterial activity that comes from its parent antimicrobial ions, chlorhexidine and ampicillin. Methods: Antibacterial activities for chlorhexidine diacetate, sodium ampicillin, chlorhexidine …

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A Mild Pulsed Electric Field Condition That Improves Acid Tolerance, Growth, And Protease Activity Of Lactobacillus Acidophilus La-K And Lactobacillus Delbrueckii Subspecies Bulgaricus Lb-12, N. Najim, Kayanush J. Aryana Jun 2013

A Mild Pulsed Electric Field Condition That Improves Acid Tolerance, Growth, And Protease Activity Of Lactobacillus Acidophilus La-K And Lactobacillus Delbrueckii Subspecies Bulgaricus Lb-12, N. Najim, Kayanush J. Aryana

Faculty Publications

Pulsed electric field (PEF) processing involves the application of pulses of voltage for less than 1 s to fluid products placed between 2 electrodes. The effect of mild PEF on beneficial characteristics of probiotic bacteria Lactobacillus acidophilus and Lactobacillus delbrueckii ssp. bulgaricus is not clearly understood. The objective of this study was to determine the influence of mild PEF conditions on acid tolerance, growth, and protease activity of Lb. acidophilus LA-K and Lactobacillus delbrueckii ssp. bulgaricus LB-12. A pilot plant PEF system (OSU-4M; The Ohio State University, Columbus) was used. The PEF treatments were positive square unipolar pulse width of …

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Developing Models Of Disease Transmission: Insights From Ecological Studies Of Insects And Their Baculoviruses, Bret D. Elderd Jun 2013

Developing Models Of Disease Transmission: Insights From Ecological Studies Of Insects And Their Baculoviruses, Bret D. Elderd

Faculty Publications

No abstract provided.

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