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Placement and recovery of seed caches by a solitary rodent, Ord's kangaroo rat (Dipodomys ordii)
(2008-09-09)
Seed caching is a common behavior that has important ecological consequences for seed-hoarding animals, granivorous competitors, and plants whose seeds are harvested and stored. Despite the significance of this behavior, ...
Yolk androgen deposition in two passerine species: Do females play favorites?
(2008-09-09)
Eggs of oviparous species contain variable amounts of androgens, such as testosterone (T), dihydrotestosterone (DHT), and androstenedione (A4). Previous studies in birds show that yolk androgens of maternal origin have ...
Role of Arabidopsis Thaliana Calmodulin Isoforms in Tolerance to Abiotic Stress
(2008-09-09)
Calmodulin and Ca2+ have been implicated in adaptation of plants to changes in its environment. Arabidopsis thaliana (Arabidopsis) genome has nine genetic loci encoding calmodulin protein isoforms. We have used wild type ...
Molecular Responses of Giardia lamblia to Gamma-Irradiation
(2008-09-09)
Giardia lamblia (syn intestinalis, syn duodenalis) is an important human pathogen and the etiological agent of giardiasis, the most common gastrointestinal disease in the world. Since its discovery in 1681, Giardia has ...
The Physiological Effects of Bright Plumage Coloration
(2008-09-09)
Songbirds with extensive, carotenoid-based plumage tend to maintain high levels of circulating carotenoids in plasma, which could represent a potential tradeoff between maintaining brightness at the expense of carotenoid-related ...
Multivariate Analysis of Chlamydia pneumoniae Lung Infection in Two Inbred Mouse Strains
(2009-02-23)
This investigation was aimed at dissecting the mechanisms of C. pneumoniae pathogenesis by multivariate analysis of challenge experiments in a mouse model of C. pneumoniae lung infection. To facilitate these analyses, a ...
Effects of Trematode Parasites on Habitat Use and Disturbance Response of Freshwater Snails in the Genus Elimia
(2008-09-09)
Freshwater snails in the genus Elimia are abundant and important grazers in many southeastern USA streams; in addition, Elimia serves as intermediate hosts to many species of parasitic trematodes and is frequently subject ...
The Physiological Effects of Relocation on Gopher Tortoises (Gopherus polyphemus)
(2008-09-09)
As a result of habitat destruction throughout the southeastern United States, gopher tortoises (Gopherus polyphemus) have experienced an 80% decrease in their populations in the past 100 years. To protect the remaining ...
Reproductive Biology of Relict Trillium (Trillium reliquum)
(2008-09-09)
Pollination and seed dispersal were studied in six populations of the endangered plant species Trillium reliquum in Bullock and Lee counties in Alabama and in Muscogee County, Georgia. Few populations of this species exist ...
Thermotolerance in Gossypium hirsutum
(2008-09-09)
Heat and drought are major factors that affect the annual cotton yield. Cotton farmers are always looking for plants that are more thermotolerant and drought tolerant to increase the yield. These characteristics can be ...