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J N Srivastava

Publications and source records attributed to J N Srivastava.

10 recordsLinked to original sources

Evaluation of inhibitory effect of the plant Phyllanthus amarus against dermatophytic fungi Microsporum gypseum.

OBJECTIVE: The antifungal activity of various solvent extracts (such as ether, chloroform, ethyl acetate and ethyl alcohol) of the plant Phyllanthus amarus against dermatophytic fungi Microsporum gypseum was observed. METHOD: Antifungal bioassay in terms of reduction in weight, colony diameter and sporulation of the target fungal colony was carried out using Broth Dilution method. Results Root part of the plant, extracted in various organic solvents did not show any noticeable antifungal activity. The percentage inhibition observed in different solvent extracts of aerial part was found as reduction in weight: chloroform [50.3%], ethyl acetate [27.7%] and ethyl alcohol [12.1%], reduction in colony diameter: chloroform [53.4%], ethyl acetate [31.4%] and ethyl alcohol [15.0%] and reduction in sporulation: maximum inhibition in chloroform extract, at test concentration of 4000 ppm at incubation period of 8 days. CONCLUSION: Chloroform fraction of the aerial part of the plant P. amarus shows significant inhibitory effect against dermatophytic fungi M. gypseum and requires chemical characterization for its bioactive principle.

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Inhibitory effect of the plant Boerhavia diffusa l. against the dermatophytic fungus Microsporum fulvum.

Antifungal activity (reduction in colony diameter) of various extracts (pt. ether, chloroform, ethyl acetate, ethyl alcohol and aqueous) of aerial and root parts of Boerhavia diffusa (Nictaginaceae) was screened against dermatophytic fungi Microsporum fulvum. Statistically significant increase has been recorded in the % inhibition of the target fungal species with increasing test concentrations (1000-5000 ppm) of chloroform, ethyl acetate and ethyl alcohol extracts of the root. The maximum % inhibition observed in various solvent extracts of root was about 26% (chloroform), 46% (ethyl alcohol) and 57% (ethyl acetate) at 5000 ppm concentration with time exposure of 10 days. The colony diameter of the target mycelial colony decreased with increasing supplementation of the phytoextract, showing the presence of significant amount of some antifungal phytochemical moiety.

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Chrysosporium tropicum efficacy against Anopheles stephensi larvae in the laboratory.

The keratinophilic soil fungus Chrysosporium tropicum was evaluated as a biological control agent against Anopheles stephensi larvae in the laboratory. Culture filtrates of C. tropicum were found to be toxic to An. stephensi larvae at various concentrations. The ranges of the 50% lethal concentration (LC50) values of fungal filtrates were 16.60-17.78, 12.02-12.88, and 34.67-35.48 microl/ml against 1st-, 2nd-, and 3rd-stage larvae, respectively. The ranges of LC99 values were 38.90-63.10, 12.02-213.80, and 74.13-109.65 microl/ml against 1st-, 2nd-, and 3rd-stage larvae, respectively.

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