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.

Role of laccase from Coriolus versicolor MTCC-138 in selective oxidation of aromatic methyl group.

Abstract: Now a day, laccases are the most promising enzymes in the area of biotechnology and synthesis. One of the best applications of laccases is the selective oxidation of aromatic methyl group to aldehyde group. Such transformations are valuable because it is difficult to stop the reaction at aldehyde stage. Chemical methods used for such biotransformations areexpensive and give poor yields. But, the laccase-catalyzed biotransformations of such type are non-expensive and yield is excellent. Authors have used crude laccase obtained from the liquid culture growth medium of fungal strain Coriolus versicolor MTCC-138 for the biotransformations of toluene, 3-nitrotoluene, and 4-chlorotoluene to benzaldehyde, 3-nitrobenzaldehyde, and 4-chlorobenzaldehyde, respectively, instead of purified laccase because purification process requires much time and cost. This communication reports that crude laccase can also be used in the place of purified laccase as effective biocatalyst.

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 .

Coherent states of a damped harmonic oscillator

Abstract: We construct here the coherent states (annihilation operator eigenstates) of a damped harmonic oscillator. These coherent states, which are normalizable, have the desired behaviour in the classical limit (ℏ→0).

Cyto-histopathological Alterations in the Liver of Azadirachtin Treated Catfish, Heteropneustes fossilis

Abstract: In the present study, impact of the plant pesticide, azadirachtin was assessed on cyto-histopathology of the liver of freshwater catfish, Heteropneustes fossilis. The fishes were treated with 20 % of 96-h LC50 value of azadirachtin i.e. 10.47 mg L−1 for 4 weeks. Six fishes were sacrificed after 1, 2, 3, and 4 weeks following the treatment. Liver tissues from the fishes were fixed, routinely processed and stained for microscopic studies, and histopathological alterations were assessed. The liver of 1 week azadirachtin exposed fish exhibited enlarged nuclei and degranulation of the cytoplasm of a few cells. After 2 weeks exposure the arrangement of hepatocytes disrupted. A few hepatocytes exhibited vacuolization and pycnotic nuclei. Following 3 and 4 weeks of treatment, more hepatocellular necrosis was observed. At places, focal necrosis and fatty degeneration was observed. Within sinusoids increased lymphocytes were noticed. It can thus be concluded that hepatic alterations as the result of botanical pesticide exposition of fish may serve as a sensitive biomarker for the toxicity of sublethal biopesticide concentrations. However, for a better understanding of liver impairments caused by biopesticides, more studies are needed.