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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Demasculinization And Feminization Of Male Gonads By Atrazine: Consistent Effects Across Vertebrate Classes, Krista A. Mccoy
Demasculinization And Feminization Of Male Gonads By Atrazine: Consistent Effects Across Vertebrate Classes, Krista A. Mccoy
Integrative Biology Faculty and Staff Publications
Atrazine is the most commonly detected pesticide contaminant of ground water, surface water, and precipitation. Atrazine is also an endocrine disruptor that, among other effects, alters male reproductive tissues when animals are exposed during development. Here, we apply the nine so-called “Hill criteria” (Strength, Consistency, Specificity, Temporality, Biological Gradient, Plausibility, Coherence, Experiment, and Analogy) for establishing cause–effect relationships to examine the evidence for atrazine as an endocrine disruptor that demasculinizes and feminizes the gonads of male vertebrates. We present experimental evidence that the effects of atrazine on male development are consistent across all vertebrate classes examined and we present a …
Monitoring Atrazine-Degrading And Atrazine-Tolerant Bacterial Populations In Lower Rio Grande Valley Agricultural Canals Using Quantitative-Pcr And Internal Atza Primers, Ibdanelo Cortez
Theses and Dissertations - UTB/UTPA
The research hypothesis was that atrazine-degrading bacteria would be detectable during the planting and rainy seasons with their populations dissipating during non-planting and dry seasons in 2010-2011. Atrazine concentration was detected in March, May, June and August for all canals with June having the highest average concentration of 0.77ppb. Gene atzA abundance was detected from June through August with July samples having the highest gene abundance of 250.6 (pg). Tolerant bacterial densities were detectable from March through June. Atrazine concentration and population abundance were not statistically different during planting and non-planting, rainy and dry seasons, although there was a trend …
Effects Of The Herbicide Atrazine On The Behavior Of The Checkered Gartersnake (Thamnophis Marcianus), Katie Chamberlain
Effects Of The Herbicide Atrazine On The Behavior Of The Checkered Gartersnake (Thamnophis Marcianus), Katie Chamberlain
Biology Theses
Atrazine is one of the most commonly used herbicides in the United States and one of the most popular weed-killers worldwide, being utilized in over 80 countries. Despite the effectiveness of atrazine, there has been growing concern over the potential harmful effects this chemical may have on non-target species exposed to this chemical. Few studies, however, have been performed on the effects of this chemical on reptiles, in particular snakes. This study examined the effects of environmentally relevant concentrations of atrazine on the foraging, antipredator, thermoregulatory, and courtship behaviors of the checkered gartersnake (Thamnophis marcianus). Effects of atrazine appeared negligible …
Effects Of Exposure To Low, Ecologically Relevant Doses Of Atrazine On Somatic And Gonadal Development In American Toad (Bufo Americanus) Tadpoles, Tyler Davis Hoskins
Effects Of Exposure To Low, Ecologically Relevant Doses Of Atrazine On Somatic And Gonadal Development In American Toad (Bufo Americanus) Tadpoles, Tyler Davis Hoskins
Undergraduate Honors Thesis Collection
Atrazine is the most commonly used herbicide in the United States, with 80 million pounds applied annually, making it the most common contaminant of ground and surface water nationwide. It has been shown to act as a potent endocrine disrupter in amphibians, causing altered somatic and gonadal development in the ecologically relevant part per billion range; as a result, it has been hypothesized that atrazine may be a major factor behind amphibian declines. However, responses of different species to the chemical vary widely, and have made predicting susceptibility difficult. Recently, it has been shown that life history can serve as …
Assessing The Stability, Biological Transfer And Developmental Impact Of Environmentally Relevant Nitrosamines Using A Chicken Egg Model, Nikita Joshi
Toxicology Program: Dissertations, Theses, and Student Research
Nitrosamines comprise a large group of potentially toxic compounds occurring in the environment as by-products of various manufacturing, agricultural and natural processes. Nitrosamines are produced from reaction of nitrite with a suitable secondary amine in an acidic matrix; these acidic conditions can occur in environmental media and in the mammalian gastrointestinal (GI) tract. This research focused on the stability, transfer, and impacts of the environmentally relevant nitrosamines, N-nitrosodimethylamine (NDMA), N-nitrosmorpholine (NMOR), and N-nitrosoatrazine (NNAT) (formed from reaction of nitrite with dimethylamine, morpholine, and atrazine), using the chicken egg and embryo model systems. Chicken eggs were used to …
Environmental Assessment & Monitoring Regime For Atrazine In Drinking Water For Kentucky
Environmental Assessment & Monitoring Regime For Atrazine In Drinking Water For Kentucky
Student Research Conference Select Presentations
To describe occurrence in the environment & sampling regime of atrazine in public water supplies in Kentucky.