Maximum Allowable Concentration ; Mineral Fibers ; analysis ; Occupational Exposure ; analysis

By establishing experimental modal of laryngeal allograft,the short-term histopathological changes of liver and kidney in Cyclosporine A (CsA)-treated rats receiving laryn- geal allograft were observed.The animals were divided into 3 groups.Group 1 was given CsA 15 mg?kg~(-1)/d by daily intraperitoneal injection for 2 weeks,Group 2 received CsA 25 mg?kg~(-1)/d, and the third group without CsA treatment served as control.All of recipients were sacrificed 14 days after transplantation.Histological examination showed that CsA nephrotoxicity was charac- terized by abundant vacuolation of the proximal tubular epithelium cells,hyaline regeneration of arterioles with thickening of vascular wall,and striped interstitial fibrosis and its hepatotoxicity by fatty degeneration with mild hyperplasia of Kupffer's cells and focal necrosis of hepatocytes. Histopathological changes of CsA-induced hepato- and nephrotoxicity of the recipients were closely correlated to the dosage of CsA received.

Administration, Oral ; Anaphylaxis ; chemically induced ; physiopathology ; therapy ; Anti-Bacterial Agents ; administration & dosage ; adverse effects ; Blood Pressure ; drug effects ; Child ; Diarrhea ; drug therapy ; Humans ; Male ; Ofloxacin ; administration & dosage ; adverse effects ; Treatment Outcome

Homocysteine ; pharmacology ; Human Umbilical Vein Endothelial Cells ; drug effects ; metabolism ; Humans ; Lipid Peroxidation ; drug effects ; Metallothionein ; pharmacology

Cysts ; complications ; Exophthalmos ; complications ; Frontal Sinus ; pathology ; Humans ; Male ; Middle Aged ; Paranasal Sinus Diseases ; complications

Asbestos ; adverse effects ; chemistry ; classification ; Carcinogens ; Fibrosis ; Humans ; Occupational Exposure

Dust ; analysis ; Laboratories ; standards ; Quality Control ; Reference Standards

Objective To investigate the effects of ursodeoxycholic acid (UDCA), dexamethasone (DEX), and S adenomethionine (SAMe) on the pregnant rats with intrahepatic cholestasis induced by ethinylestradiol (EE). Methods A total of 50 15 day pregnant Wistar rats were randomly divided into five groups: control group, EE group, UDCA group, DEX group, and SAMe group. In EE group, rats were subcutaneously injected with EE (2.5 mg?kg -1 ?d -1 ) for 5 d. In the control group, rats received subcutaneous injection of appropriate volume of propylene glycol (PG) for 5 d. In UDCA, SAMe, and DEX groups, rats were administered with the same dose of EE plus UDCA (100 mg?kg -1 ?d -1 ), SAMe (100 mg?kg -1 ?d -1 ), and DEX (1 mg?kg -1 ?d -1 ) for 5 d, respectively. The serum levels of aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatases (ALP), glycocholic acid (GC), and total bilirubin were measured after cesarean. Morphologic changes of the liver of pregnant rats and the growth and development of the fetal rats were observed. Results The serum levels of ALT, ALP, GC in rats of UDCA group were decreased significantly as compared with those in DEX group ( P

Objetcive To analyze the contrast-enhanced ultrasound (CEUS)features in clear cell renal cell carcinoma (CCRCC) of different size and to discuss the diagnostic value of CEUS in CCRCCs. Methods The contrast-enhanced and conventional US features of 80 CCRCCs confirmed pathologically were retrospectively analyzed. Samples were divided into three groups by diameters: small CCRCCs (≤30 mm), medium CCRCCs(＞30 mm) and large CCRCCs(＞50 mm). The tumoral vascularity, lesion homogeneity and presence of an anechoic rim were observed on conventional US. The enhancement of echogenicity, homogeneity and pseudocapsule were evaluated on CEUS. Results Among the 80 renal masses, 32 were small CCRCCs, 28 were medium CCRCCs while the large CCRCCs were 20. On conventional US, 18.8%(6/32) of small CCRCCs, 71.4%(20/28) of medium CCRCCs and 95%(19/20) of large CCRCCs demonstrated as heterogeneous and the differences were highly statistically significant, whereas there were no differences in the tumoral vascularity and the presence of pseudocapsule sign among the three groups. On CEUS, 28.1%(9/32) of small CCRCCs, 85.7%(24/28) of medium CCRCCs and 100%(20/20) of large CCRCCs showed a homogeneous enhancement. The incidence of pseudocapsule sign in medium tumors was higher than small and large groups(71.4%,50% and 25%,respectively). There were statistically significant differences among the three groups in the enhanced homogeneity and the presence of pseudocapsule sign. However, all the three groups revealed mainly isoechoic and hyperechoic and there were no differences among them. Compared with conventional US, CEUS depicted significantly the increased tumoral vascularity (51.3% vs. 87.5%) and pseudocapsule sign(22.5% vs. 51.3%). Eight lesions demonstrated heterogeneous contrast enhancement on CEUS while homogeneous on conventional US, but there were no differences in lesion homogeneity between conventional US and CEUS findings. Conclusions Different sizes of CCRCC showed distinct CEUS features in the enhanced homogeneity and the presence of pseudocapsule sign. CEUS is more effective on improving the sonographic characteristics of tumoral visualization and may provide important information of US findings for the diagnosis of renal cell carcinoma.

Objective To establish a RP-HPLC method for determining the concentration of prulifloxacin active metabolite in human plasma and urine.Methods The supernatant obtained by centrifugation after the sample was precipitated with methanol- acetonitrile (1:1) was chromatographically separated on a Diamonsil C_(18)(250 mm?4.6 mm,5?m) using a mobile phase con- sisting of acetonitrile and 0.05 mol/L potassium dihydrogen phosphate (pH2.2) containing 1% tetrabutylammonium bromide. The solutions of 20:80 (V/V) and 12:88 (V/V) at a flow rate of 1.0 mL/min and 1.6 mL/min were used for plasma and u- rine, respectively.Then the samples were assayed at wavelength of Ex 280 nm and Em 425 nm.Results The linear range for prulifloxacin active metabolite in plasma and urine were 0.005-5 mg/L (r=0.9999) and 0.05-5 mg/L(r=0.9999)with a low- er limit of quantitation of 0.002 mg/L and 0.01 rag/L, respectively.In plasma, the relative recovery ranged from 100.64% to 101.00% at the concentration of 5.00, 0.50 and 0.05 mg/L and within-day and between-day precisions were less than 2.5% and 4.6% respectively.Meanwhile, the relative recovery ranged from 97.20% to 100.20% at the concentration of 2.50, 0.50 and 0.10 mg/L in urine.The within-day and between-day precisions were lower than 1.3% and 4.3%, respectively.The method had been successfully used for the pharmacokinetic studies of a prulifloxacin formulation after oral administration to healthy volunteers.Conclusions The present method is simple, rapid, accurate, reproducible and suitable for the pharmacoki- netic study of prulifloxacin in humans.