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Showing 1 to 12 of 12 for “"Cotton rats"”.
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Chromosomal Evolution of the Cotton Rats, Genus Sigmodon (Rodentia, Muridae)
Made available in DSpace on 2014-12-14T16:11:16Z (GMT). No. of bitstreams: 1 7820925.pdf: 5076424 bytes, checksum: 08c88bb7fa626ece254c9e6aa5182594 (MD5) Previous issue date: 1978
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Photoperiodic Control of Reproduction in Male Hispid Cotton Rats, Sigmodon Hispidus
The hispid cotton rat, Sigmodon hispidus, has been shown to have a seasonal reproductive cycle and may use photoperiod to regulate this cycle. Male Sigmodon were placed in differing photoperiods, and serum prolactin, testicular size, testicular mass and spermatogenic activity were measured as …
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Metabolic and Thyroidal Effects of Vinclozolin on Cotton Rats (Sigmodon Hispidus)
… norepinephrine-induced) were measured in wild cotton rats (Sigmodon hispidus) while being treated with a commonly used fungicide, vinclozolin. Treatments included two dosages (2.8 mg/m² and 281 mg/m²) and three treatment periods (pregnancy, lactating, and post-lactating) for a total of seven …
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The Ontogeny of Thermoregulatory Abilities in Neonatal Cotton Rats and Montane Voles
… chambers at temperatures 20, 25, 30 and 35°C for cotton rat (Sigmodon hispidus) neonates and at temperatures 25, 30 and 35°C for montane vole (Microtus montanus) neonates to determine the response to cold, and to estimate the thermal neutral zone (TNZ) of each species. TNZ for cotton rats was …
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Mucosal and systemic immune responses induced by immunisation of cotton rats with recombinant adenoviruses
… conferring protection against BHV-1 infection, a cotton rat (Sigmodon hispidus) model for intranasal BHV-1 challenge was developed. I used this model to assess the ability of different routes of immunisation with the recombinant adenoviruses to elicit gD-specific systemic and mucosal immunity and …
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Flea and Louse Infestations of Cotton Rats (Sigmodon Hispidus) In The Southeastern United States
<p>Ectoparasites were collected from cotton rats (Sigmodon hispidus) in 20 sites in the Southeastern United States (FL, GA, MS, NC and SC). Prevalence and mean intensity of parasitism by sucking lice (Anoplura) and fleas (Siphonaptera) of cotton rats were recorded at all sites. The geographical …
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An Examination of Seasonal Growth and Survivorship of <i>Sigmodon hispidus</i> in Southeastern Virginia
… of <em>Sigmodon hispidus</em>, the hispid cotton rat, is necessary in order to gain additional knowledge and perspective on this species in its northernmost distribution on the east coast of the United States. Previous studies of Virginia cotton rats were based on data from necropsies, …
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Experimental studies of the ecology and evolution of eastern equine encephalitis virus and implications for its emergence and classification
… use of different vertebrate host species. Wild cotton rats (Sigmodon hispidus) and house sparrows (Passer domesticus) were collected in Galveston and Houston, Texas, respectively, and evaluated for their potential to serve as amplification and/or reservoir hosts for NA and SA EEEV. Juvenile …
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An Attempt to Cultivate the Lansing Strain of Poliomyelitis Virus in the Embryonated Egg
… (Lansing strain) from the monkey to Eastern cotton rats. He soon afterward further transmitted the disease to white mice. A smaller and more economical animal was now available to the Virologist. However, the maintenance of the virus was still able to be accomplished only by continued passage …
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Vector Potential of Two Southeastern Tick Species (Acari: Ixodidae) for a Northeastern Strain of the Lyme Disease Spirochete, <em>Borrelia burgdorferi</em> Sensu Stricto
… <em>Sigmodon</em> <em>hispidus</em> Say & Ord (cotton rats) and <em>Mus</em> <em>musculus</em> L. (laboratory mice). Fed nymphs were tested for infection via tick culture and their host rodents were tested for infection via ear clip tissue in BSK-H medium culture. Ixodes scapularis larvae were …
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Investigating the Effects of Vinclozolin on Reproduction in Three Generations of Sigmodon Hispidus
… F2 animals had lower PGM and PTV than the F1 cotton rats; and lower TRM than both the P and F1 generations, and the F1 and F2 generations had lower sperm indeces than the P animals. Significant treatment effects were on growth, inclding medium-dose having lower mass than the control group at …
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Taxonomic analysis of electrophoretic blood serum patterns in the cotton rat, Sigmodon
Thesis (M.S.)--Michigan State University. Dept. of Zoology, 1968