Deen Dayal Upadhyay Gorakhpur University

About: Deen Dayal Upadhyay Gorakhpur University is a education organization based out in Gorakhpur, Uttar Pradesh, India. It is known for research contribution in the topics: Thermal decomposition & Lymnaea acuminata. The organization has 1032 authors who have published 1591 publications receiving 21734 citations. The organization is also known as: Gorakhpur University.

Photoelectric conversion studies on zinc selenide

Abstract: The photoelectroactivity of polycrystalline zinc selenide films prepared by electrochemical codeposition in zinc sulphate solutions of different concentrations containing the l−/l2 redox couple has been investigated. Measured photopotentials, photocurrents and the initial rate of build-up of photopotentials indicate a significant enhancement in photoelectro-convertibility with increase in concentration, in spite of practically no change in the flat band potentials. The photoelectroactivity of a p-n heterojunction photoelectrochemical cell using cadmium selenide along with zinc selenide has also been studied.

Acute Toxicity of a Heavy Metal Cadmium to an Anuran, the Indian Skipper Frog Rana cyanophlyctis

Abstract: Background: There has been increasing awareness throughout the world regarding the remarkable decrease in amphibian population. For such amphibian population decline several causes have been given. Cadmium, a heavy metal is released both from natural sources (leaching of cadmium rich soils) and anthropogenic activities to the aquatic and terrestrial environments. This study evaluated the toxicity of heavy metal cadmium to Indian skipper frog Rana cyanophlyctis. Methods: For the determination of LC50 values for cadmium, four-day static renewal acute toxicity test was used. Five replicates each containing ten frogs were subjected to each concentration of cadmium chloride (15, 20, 25, 30, 35, 40, 45 and 50 mg/L). At different exposure periods (24, 48, 72 and 96 h), the mortality of the frog was subjected to Probit analysis with the POLO-PC software (LeOra Software) to calculate the LC50 and 95% confidence level. Results: The LC50 values of cadmium chloride for the frog R. cyanophlyctis at 24, 48, 72, and 96 h are 32.586, 29.994, 27.219 and 23.048 mg/L, respectively. The results have been discussed with the toxicity reported for other aquatic vertebrate --fish. Conclusion: Cadmium caused mortality to the frog and this could be one of the reasons for population decline of frogs which inhabit water contaminated with heavy metals.

Molluscicidal activity of Morus nigra against the freshwater snail Lymnaea acuminata

Abstract: The molluscicidal activity of Morus nigra fruit, bark and leaf powder against the snail Lymnaea acuminata was time and concentration dependent. Toxicity of fruit powder (96h LC 50 : 166.92 mg/L) was more pronounced in comparison to bark powder (96h LC 50 : 173.17 mg/L) and leaf powder (96h LC 50 : 173.69 mg/L). Ethanolic extracts of M . nigra fruit, bark and leaf was more toxic than their other organic solvent extracts. The molluscicidal activity of ethanolic extract of M . nigra fruit powder (24h LC 50 : 116.23 mg/L) was more effective than the ethanolic extract of bark powder (24h LC 50 : 154.41 mg/L) and leaf powder (24h LC 50 : 139.80 mg/L). The 96h LC 50 of column-purified fraction of M . nigra fruit powder was, 10.03 mg/L whereas that of bark and leaf powder was 8.69 mg/L and 4.97 mg/L, respectively. Column and thin layer chromatography analysis demonstrates that the active molluscicidal component in M . nigra is quercetin (96h LC 50 : 1.11 mg/L), apigenin (96h LC 50 : 1.92 mg/L) and morusin (96h LC 50 : 2.12 mg/L), respectively. Co-migration of quercetin (R f 0.49), apigenin (R f 0.51) and morusin (R f 0.52) with column-purified fruit, bark and leaf of M . nigra on thin layer chromatography demonstrates same R f value. The present study indicates that M . nigra may be used as potent source of molluscicides against the snail Lymnaea acuminata .