A method for rapidly determining t,t-muconic acid (MA) by high performance liquid chromatography was developed and successfully applied to urine samples from 152 workers exposed to benzene (64 men, 88 women) and 213 non-exposed controls (113 men, 100 women). The MA concentrations in urine correlated linearly with time weighted average benzene concentrations in the breath zone air of workers. A ...

Taiwan abalone Haliotis diversicolor supertexta held in 30 parts/per thousand seawater and 26 degrees C were injected with TSB-grown Vibrio parahaemolyticus (1.6 x 10(5)cfu abalone(-1)), and then placed in water containing different concentrations of ammonia-N (un-ionized plus ionized ammonia) at 0.01 mg l(-1) (control), 1.12, 3.22, 5.24 and 10.18 mg l(-1). Mortality of abalone increased direct...

Recognizing the significance of the life stage of fish for nano-eco-toxicological studies, the acute toxicity of colloidal silver nanoparticles (AgNPs) was tested in three different life stages of rainbow trout. Fishes were exposed to colloidal AgNPs at nominal concentrations of 100, 32, 10, 3.2, 1, 0.32, 0.1, and 0.032 mg/L. The estimated 96 hr LC50 values were 0.25, 0.71, and 2.16 mg/L for th...

Chronic two-kidney, one clip (2K1C) renovascular hypertension is characterized by a largely angiotensin-independent elevated blood pressure (BP). We hypothesized that the long-term effect of hypertension would compromise endothelium-derived nitric oxide (NO) and diminish its influence in controlling renal perfusion. We determined the influence of endothelium-derived NO on renal hemodynamics and...

bacterial diseases have been reported to be the major limiting factor in shrimp production. the use of natural products such as antimicrobials has been reported as a solution to the problem. the crude extract of a red seaweed laurencia snyderiae obtained from the persian gulf was evaluated for shrimp growth performance and to determine in vivo efficacy of this seaweed in the prevention of shrim...