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Articles 31 - 35 of 35
Full-Text Articles in Biology
Seasonal Steroid Hormone Levels And Their Relation To Reproduction In The Western Diamond-Backed Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), Emily N. Taylor, Dale F. Denardo, David H. Jennings
Seasonal Steroid Hormone Levels And Their Relation To Reproduction In The Western Diamond-Backed Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), Emily N. Taylor, Dale F. Denardo, David H. Jennings
Biological Sciences
We report seasonal variation in steroid hormone levels in blood samples from free-ranging Western Diamond-backed Rattlesnakes (Crotalus atrox), and the relationship between these hormones and events in the reproductive cycle. At a field site in the Sonoran Desert of south-central Arizona, we collected monthly blood samples over the course of two active seasons from 17 radiotelemetered females, and over three active seasons from 103 randomly encountered males. We used radioimmunoassay to measure plasma levels of 17β-estradiol, progesterone, corticosterone, and testosterone in samples from females, and corticosterone and testosterone in samples from males. Non-reproductive females have consistently low levels …
Effects Of Acid Stress On Vibrio Parahaemolyticus Survival And Cytotoxicity, P.S. Marie Yeung, Kathryn J. Boor
Effects Of Acid Stress On Vibrio Parahaemolyticus Survival And Cytotoxicity, P.S. Marie Yeung, Kathryn J. Boor
Biological Sciences
For several foodbome bacterial pathogens, an acid tolerance response appears to be an important strategy for counteracting acid stress imposed either during food processing or by the human host. The acid tolerance response enhances bacterial survival of lethal acid challenge following prior exposure to sublethal acidic conditions. Previous studies have revealed relationships between a foodbome pathogen's ability to survive acid challenge and its infectious dose. Vibrio parahaemolyticus is capable of causing gastroenteritis when sufficient cells of pathogenic strains are consumed. This study was designed to characterize acid sensitivities and to compare the effect of sublethal acid exposure (adaptation) on survival …
Epidemiology, Pathogenesis, And Prevention Of Foodbome Vibrio Parahaemolyticus Infections, P.S. Marie Yeung, Kathryn J. Boor
Epidemiology, Pathogenesis, And Prevention Of Foodbome Vibrio Parahaemolyticus Infections, P.S. Marie Yeung, Kathryn J. Boor
Biological Sciences
Since its discovery about 50 years ago, Vibrio parahaemolyticus has been implicated as a major cause of foodborne illness around the globe. V. parahaemolyticus is a natural inhabitant of marine waters. Human infections are most commonly associated with the consumption of raw, undercooked or contaminated shellfish. A few individual V. parahaemolyticus virulence factors, including the thermostable direct hemolysin (TDH) and TDH-related hemolysin (TRH), have been investigated in depth, yet a comprehensive understanding of this organism's ability to cause disease remains unclear. Since 1996, serotype 03:K6 strains have been associated with an increased incidence of gastroenteritis in India and in Southeast …
Serpentine: A Model Habitat For Botanical Research In Sri Lanka, Nishanta Rajakaruna, Alan J. M. Baker
Serpentine: A Model Habitat For Botanical Research In Sri Lanka, Nishanta Rajakaruna, Alan J. M. Baker
Biological Sciences
Serpentine (ultramafic) outcrops are found in most parts of the world and for many years have attracted the attention of soil scientists and plant biologists alike due to the unusual nature of both the substrate and the life forms they harbour. In this paper, we introduce serpentine outcrops as a model habitat for botanical studies and review preliminary findings of a recently conducted soil and floristic survey of four of the five known serpentine outcrops in Sri Lanka. We hope that this paper will stimulate much-needed studies, both exploratory and experimental, and point to the immediate need for conservation of …
The Edaphic Factor In The Origin Of Plant Species, Nishanta Rajakaruna
The Edaphic Factor In The Origin Of Plant Species, Nishanta Rajakaruna
Biological Sciences
Although speciation has been a central focus in evolutionary biology for more than a century, there are very few case studies where we have a good understanding of the exact forces that may have acted in the diversification of a group of organisms. In order to examine such forces, botanists have often focused on closely related plants that are found under contrasting soil conditions. The study of such edaphically differentiated plants has provided valuable insight to the role of natural selection in evolution. This paper discusses several key studies that have appeared in the literature in the last half century …