RESUMO
Toxic effects of Omega Chrome Red ME, a popular textile dye, on the nitrogen fixing cyanobacterium Nostoc calcicola were studied. The growth of N. calcicola was found to be suppressed at 10 and 20 mg liter-1 initial concentrations of dye, whereas a low initial concentration of 5 mg liter-1 slightly favors growth. Removal of the dye was carried out by adsorption using some cheap and unconventional adsorbents like coal, fly ash, wollastonite, and china clay. It has been observed that, in all cases, the low adsorbate concentration, the low temperature, and an acidic medium favor the dye removal process. The process of uptake follows first-order adsorption rate expression and obeys Langmuir's model of adsorption. The removal process is also partially diffusion controlled. Thermodynamic and pH studies were run to explain the results.
Assuntos
Compostos Azo/toxicidade , Compostos de Cálcio , Cianobactérias/efeitos dos fármacos , Resíduos Industriais/efeitos adversos , Silicatos , Têxteis , Eliminação de Resíduos Líquidos/métodos , Poluentes Químicos da Água/toxicidade , Adsorção , Silicatos de Alumínio , Carbono , Argila , Carvão Mineral , Cinza de Carvão , Cianobactérias/crescimento & desenvolvimento , Estudos de Viabilidade , Material Particulado , Ácido SilícicoRESUMO
Female wistar rats were inoculated intratracheally with 10 mg/ml suspensions of various dusts, viz: quartz, fly ash, mica and corundum in physiological saline. Biochemical markers of bronchoalveolar lavage fluid (BALF) were analysed 8 days after the instillation of the dusts. Elevated levels of proteins, sialic acid and phospholipid contents and the activity of lactate dehydrogenase correlated well with the degree of the known fibrogenic potential of different dusts in the lungs in the following order, quartz greater than fly ash greater than mica greater than corundum. beta-glucuronidase activity, was however, only elevated in the quartz inoculated group of rats. It is suggested that biochemical constituents of BALF analysed shortly after the exposure to different dusts can be useful to mirror alterations in the tissue response to mineral dusts.
Assuntos
Líquido da Lavagem Broncoalveolar/química , Poeira/efeitos adversos , Pulmão/efeitos dos fármacos , Óxido de Alumínio/toxicidade , Silicatos de Alumínio/toxicidade , Animais , Líquido da Lavagem Broncoalveolar/enzimologia , Carvão Mineral/toxicidade , Feminino , Glucuronidase/análise , L-Lactato Desidrogenase/análise , Ácido N-Acetilneuramínico , Fosfolipídeos/análise , Proteínas/análise , Quartzo/toxicidade , Ratos , Ácidos Siálicos/análiseAssuntos
DNA/análise , Fósforo/metabolismo , Animais , Fenômenos Químicos , Físico-Química , Radioisótopos do Iodo , Masculino , Radioisótopos de Fósforo , RatosRESUMO
Effects of partial body gamma irradiation have been studied on rat testis at lethal (2000 R) and sublethal (720 R) doses. Radiation produced a progressive decline in DNA and RNA content of testis for first 15 days at both lethal and sublethal doses, followed by recovery as evidenced up to 74 days without any evidence for recovery of spermatogenesis. The incorporation of P-32 into nucleic acids was also low as compared to normal rats on day 8 postirradiation. Subsequently there was a tendency for the enhanced incorporation of P-32 in nucleic acid fractions. The P-32 nucleic acids specific activities were higher on 74th day in radiated rats than in normal controls. Enhanced incorporation of P-32 in nucleic acids and phospholipid fractions after 15 days of irradiation indicates greater synthetic activity of testicular interstitium rather than in recovery of germ cells.