the pyrrolizidine alkaloids (pas) are a group of chemicals found in a variety of plant species throughout the world. these toxic alkaloids are distributed mainly in senecio (compositae), crotalaria (legominosae) and heliotropium (boraginaceae) species. plants containing these alkaloids cause significant mammalian morbidity and mortality, especially in humans. upon ingestion, metabolic activatio...

Solar simulator irradiation of an aqueous suspension of prednisone, a widely prescribed drug, produces seven photochemical derivatives. The compounds have been identified on the basis of their physical features. All the chemicals have been tested to evaluate their toxic effects on freshwater organisms from different trophic levels. The rotifer Brachionus calyciflorus and two crustaceans, the cl...

Gastrointestinal (GI) and genitourinary (GU) toxicity was assessed during and after conventional IMRT in 21 low to intermediate risk cancer patients that had received an absorbable hydrogel spacer between the prostate and the rectum. The transperineal hydrogel injection resulted in the creation of 11.5 mm space between the prostate and rectum; space that was not decreased throughout radiotherap...

Industrial wastes may produce leachates that can contaminate the aquatic ecosystem. Toxicity testing in acute and chronic levels is essential to assess environmental risks from the soluble fractions of these wastes, since only chemical analysis may not be adequate to classify the hazard of an industrial waste. In this study, ten samples of solid wastes from textile, metal-mechanic, and pulp and...

Worldwide, pyrethroid pesticides have been widely used in the control of agricultural pests and indoor pesticides, so they an important impact on human daily life. The acute toxicity studies gotten many achievements progress, but there is still no clear demonstration its long-term chronic effects. This review presented collection published experiments, population surveys laboratory tests effect...

Abstract Background Azadirachta indica , Khaya senegalensis Anogeissus leiocarpus and Tamarindus are important ethnomedicinal plants used for health mitigation since the history of mankind. They discretionarily in folkloric medicine on premise that they natural products devoid synthetic preservatives. However, nature endows with metabolites warding off potential attacks from animals environment...

Objective(s): Due to the prevalence and pervasiveness of stress in modern life and exposure to both chronic and acute stresses, it is not clear whether prior exposure to chronic stress can influence the impairing effects of acute stress on memory retrieval. This issue was tested in this study. Materials and Methods: Adult male Wistar rats were randomly assigned to the following groups: control,...