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Does Atrazine Influence Larval Development and Sexual Differentiation in Xenopus laevis?
TLDR
These studies demonstrate that long-term exposure of larval X. laevis to atrazine at concentrations ranging from 0.01 to 100 μg/l does not affect growth, larval development, or sexual differentiation. Expand
Chronic toxicity of pulse‐dosed fenoxycarb to Daphnia magna exposed to environmentally realistic concentrations
TLDR
The estimated maximum acceptable toxicant concentration (MATC) was 26 μg/L, calculated from exposure of the most sensitive age group (less than 24 h old) to environmentally realistic levels of fenoxycarb, which represents a substantial reduction in toxicity when compared to the MATC previously reported from a standard, constant-exposure study. Expand
Effects of diazinon on large outdoor pond microcosms
TLDR
Microcosm results were consistent with laboratory toxicity data for some taxa, but differed substantially for others (e.g., rotifers, Chironomini, and odonates), and the no-observed-effect concentration in the microcosms was near the 10th percentile of single-species LC50 values. Expand
Effects of Atrazine in Fish, Amphibians, and Reptiles: An Analysis Based on Quantitative Weight of Evidence
TLDR
The WoE showed that atrazine might affect biomarker-type responses, such as expression of genes and/or associated proteins, concentrations of hormones, and biochemical processes, at concentrations sometimes found in the environment, but these effects were not translated to adverse outcomes in terms of apical endpoints. Expand
Recovery of photosynthesis and growth rate in green, blue-green, and diatom algae after exposure to atrazine.
TLDR
Effects at test levels up to the highest tested exposure levels were determined to be algistatic (reversible), and pulsed exposure profiles of atrazine typically measured in Midwestern U.S. streams are unlikely to result in biologically meaningful changes in primary production given that the effects ofatrazine are temporary and fully reversible in species representative of native populations. Expand
Development, standardization and refinement of procedures for evaluating effects of endocrine active compounds on development and sexual differentiation of Xenopus laevis
TLDR
The final verified protocol is suitable for determining effects of EAC on development and sexual differentiation in X. laevis and indicated reproducible biological performance. Expand
Seasonal synchronicity of algal assemblages in three Midwestern agricultural streams having varying concentrations of atrazine, nutrients, and sediment.
TLDR
No effects on algal abundance, diversity or assemblage structure were observed as a result of atrazine pulses; this lack of response may be due to exposure events of insufficient concentration or duration, or the composition of the algal assemblages present. Expand
Recovery of duckweed from time-varying exposure to atrazine.
TLDR
Time to recovery, therefore, was found to be largely independent of exposure duration except at the highest concentrations assessed, and growth rates indicated marginally prolonged recovery at the higher concentrations. Expand
Population-specific incidence of testicular ovarian follicles in Xenopus laevis from South Africa: a potential issue in endocrine testing.
TLDR
Phylogenetic analysis of mitochondrial and nuclear genes indicates that frogs from the SW Cape are evolutionarily divergent from those from NE South Africa and the rest of sub-Saharan Africa. Expand
Effects of 17 beta-estradiol exposure on Xenopus laevis gonadal histopathology.
TLDR
A comparison of the gross and microscopic evaluations suggested that some morphologic changes in the gonads may potentially be missed if studies rely entirely on macroscopic assessment. Expand
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