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Biomedical subjects

C R Murti

Publications and source records attributed to C R Murti.

At least 19 recordsLinked to original sources
PubMed1984

45Ca uptake from water by snails (Lymnaea vulgaris) in control and detergent-polluted samples.

A biostatic assay method involving 45Ca uptake into shells and tissues of snails (Lymnaea vulgaris) in 72 hr was developed to follow the effect of detergent-polluted water on ecosystems. There was a marked decrease in the 45Ca uptake by shells and tissues of linear alkyl benzene sulfonate-exposed animals as compared to controls. No change in 45Ca uptake was observed in dead shells, thereby excluding the possibility of passive exchange.

Animals↗
PubMed1984

The water flea (Daphnia magna) as a sensitive indicator for the assessment of toxicity of synthetic detergents.

The water flea (Daphnia magna) was used as a sensitive indicator for assessing the toxicity due to synthetic detergents. Acute and chronic toxicity of detergents to the water flea was studied under laboratory conditions by following the median tolerance limit (TLM) at 48 hr and the rate of survival. A significant decrease in the rate of reproduction (number of hatching and neonates produced) were found at 21 days. During acute toxicity studies behavioural changes were also noticed.

Animals↗
PubMed1984

Effect of mica dust and choline on the lymph nodes of rats.

Male albino rats given choline alone by intraperitoneal injection (40 doses of 25 mg/5 days a week over a period of 10 weeks), developed atypical lymphadenopathy at the end of the experiment (330 days). In a second group, the intratracheal instillation of single dose of 25 mg of respirable mica provoked proliferation of reticular cells and macrophages in the tracheobronchial lymph nodes. However, in a third group, the combined action of choline and mica caused marked lymphadenopathy with abnormal cells. The role of choline, an essential component of cell membrane, in enhancing the reaction to mica in the lymph nodes, is discussed.

Aluminum Silicates↗
PubMed1981

Placental transfer of pesticides in humans.

Transfer of organochlorine pesticides from mother to fetus has been studied in 100 women. The concentrations of organochlorine pesticides were examined in maternal blood, placenta, and umbilical cord blood of the same mother/child pair. Residue levels of dichlorodiphenyl trichloro ethane (DDT) and its metabolites, isomers of benzene, hexachloride (BHC) and aldrin were detected in all the samples analyzed, indicating their transfer from mother to the fetus. A correlation was found to exist between the pesticide concentration and age, dietetic habits and area of residence of pregnant women.

Adult↗
PubMed1981

Long-term occupational exposure to DDT.

Blood serum of twenty workers occupationally exposed to DDT for an average duration of 14 years was analysed for organochlorine pesticides by gas-liquid chromatography with an electron capture detector. Significant levels of BHC, p,p'-DDT, p,p'-DDD and p,p'-DDE were detected. A higher incidence of total DDT equivalent, about 10 times, was observed in DDT exposed workers when compared with a comparable sample of unexposed persons from the general population. Levels of DDT in serum of occupationally exposed workers were more than the permitted level of 200 ppb. The daily intake was computed to be about 10 mg/man/day as against 0.25 mg--the acceptable daily intake. Abnormal nerve conduction was encountered in a few cases of DDT sprayers. No significant correlation was observed between the total DDT equivalent in serum and duration of occupational exposure in workers. Levels of BHC in controls was 2.3 times the level in exposed workers, possibly due to induction of hepatic drug metabolising enzymes by high levels of DDT in the latter group. Findings are discussed in the light of existing knowledge of the bio-chemical effects evoked due to residual intoxication of DDT during occupational exposure.

Adult↗