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Full-Text Articles in Life Sciences

Eneterotoxigenic Bacillus Cereus And Bacillus Thuringiensis Spores In U.S. Retail Spices, Upasana Hariram Mar 2015

Eneterotoxigenic Bacillus Cereus And Bacillus Thuringiensis Spores In U.S. Retail Spices, Upasana Hariram

Masters Theses

Bacillus cereus is a ubiquitous organism and a potential foodborne pathogen that can cause two types of gastrointestinal diseases: emesis and diarrhea. The emetic syndrome is caused by a heat and acid stable peptide toxin that is pre-formed in food, while the diarrheal syndrome is associated to two 3-protein, heat labile enterotoxin complexes that are formed in the intestine after ingestion of the organism. There are many reports on the isolation and characterization of Bacillus cereus from various foods, however there are no studies on the levels, toxigenicity and physical characteristics of B. cereus isolated from U.S. retail spices. …


Two Regulatory Aspects Of Ino1 Transcription In Yeast, Tschen-Wei Chang Mar 2015

Two Regulatory Aspects Of Ino1 Transcription In Yeast, Tschen-Wei Chang

Masters Theses

This study focuses on understanding the mechanisms of expression control of a phospholipid biosynthetic gene, INO1. This study also includes investigation into transcriptional regulation of SNA3, a gene in tandem upstream of INO1.

INO1 expression is a prevailing model for transcription studies. INO1 is repressed under growth conditions with inositol and derepressed by two transcription activators, Ino2 and Ino4, when inositol is absent. Coordination of the centromeric binding factor, Cbf1, with Ino2 and Ino4 is required for efficient derepression of INO1. Transcription of the INO1 adjacent SNA3 gene is also influenced by inositol. INO1 and SNA3 are …


Ant (Hymenoptera: Formicidae) Assemblages In Three New York Pine Barrens And The Impacts Of Hiking Trails, Grace W. Barber Mar 2015

Ant (Hymenoptera: Formicidae) Assemblages In Three New York Pine Barrens And The Impacts Of Hiking Trails, Grace W. Barber

Masters Theses

Ants are ecologically important, environmentally sensitive, widespread, and abundant, yet ant assemblages of many habitats remain poorly understood. Ants in inland barrens of New York State (NY) barely have been studied, but the limited data suggest such habitats are likely to support uncommon ant species and high species density for the region. To increase knowledge of these assemblages, I systematically collected ants from three inland barrens systems in NY, to create species lists and measure species density. I also investigated how hiking trails — a common man-made disturbance — may be impacting ant assemblages in these early-successional, disturbance-dependent ecosystems. My …