The aim of this study was to evaluate the effect of environmentally realistic egg loadings of the polychlorinated biphenyl Aroclor 1254 on the subsequent growth and behavioural survival skills of Atlantic croaker Micropogonias undulatus larvae. Adult fish were given a dietary administration of 0 (control) or 0.4 (dosed) mg Aroclor 1254 kg–1 fish d–1 for 2 wk during the final stages of gonadal r...

Polychlorinated biphenyl (PCB) congeners differentially reduce serum thyroxine (T(4)) in rats, but little is known about their ability to affect biliary excretion of T(4). Thus, male Sprague-Dawley rats were orally administered Aroclor-1254, Aroclor-1242 (32 mg/kg per day), PCB-95, PCB-99, PCB-118 (16 mg/kg per day), PCB-126 (40 μg/kg per day), 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) (3.9 μg...

Drug-drug interaction and herb-drug interaction have been frequently reported when patients take propofol in combination with other important clinical drugs or herbs. Intestinal bacteria-catalyzed biotransformation process might significantly change the properties of compounds, such as the efficiency, toxicity, and the pharmacokinetic behaviours. The present study aims to investigate whether th...

We have identified the sites phosphorylated in vitro by epidermal growth factor (EGF) receptor kinase in bovine brain phospholipase C-gamma (PLC-gamma). They are tyrosine residues 472, 771, 783, and 1254. The rate of phosphorylation was fastest with the sites at 771 and 783, then at 1254, and slowest at 472. PLC-gamma isolated from cells treated with EGF is known to contain at least four tyrosi...

Previously published studies have shown that cytochrome P450 (P450) enzyme systems can produce reactive oxygen species and suggest roles of P450s in oxidative stress. However, most of the studies have been done in vitro, and the potential link between P450 induction and in vivo oxidative damage has not been rigorously explored with validated biomarkers. Male Sprague-Dawley rats were pretreated ...

A selective pressurized liquid extraction (SPLE) method was developed for a streamlined sample preparation/cleanup to determine Aroclors and coplanar polychlorinated biphenyls (PCBs) in soil and sediment. The SPLE was coupled with an enzyme-linked immunosorbent assay (ELISA) for an effective analytical approach for environmental monitoring. Sediment or soil samples were extracted with alumina, ...

We present Chandra observations of the radio-quiet Broad Absorption Line (BAL) QSO PG 1254+047. We find that it is a weak X-ray source, with a total of 44 ± 7 photons measured in 36 ksec across the observed energy range 0.7 − 6.0 keV. Its X-ray weakness is consistent with the known correlation between αox and the strength of the UV absorption lines. The spectral energy distribution suggests tha...

The aim of the present study is to investigate the influence of the environmental factors, smoking and alcohol, on the biotransformation of cyclophosphamide (CP) in the rat in vivo and in vitro with S9 liver fractions. The biotransformation of CP was studied by the determination of the CP metabolites, nor-nitrogen mustard (NNM), 4-ketocyclophosphamide (KCP), and carboxyphosphamide (CAR). The ef...

Ingestion of diets containing Aroclor 1254, a mixture of polychlorinated biphenyls, for 2 years led to a dose-related increase in the incidence of focal lesions in the glandular stomachs of male and female F344 rats. The incidence of stomach lesions was 6% in control specimens and in speci mens from rats fed a diet containing 25, 50, or 100 ppm Aroclor 1254, the incidences of stomach lesions we...

Aroclor 1254 was fed to groups of 24 male and 24 female F344 rats, from 7 weeks of age, at dietary concentrations of 25, 50 and 100 ppm for up to 105 weeks. There was a dose- related depression of body weight gain for both sexes and decrease in survival for male rats. Histologically, an increased incidence of gastric intestinal metaplasia and adenocarcinoma was found in both sexes. Hepatocellul...