http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/536 2026-05-01T02:12:20Z 2026-05-01T02:12:20Z Ralte, Vanlalhruaii http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/539 2024-06-11T10:10:12Z 2022-01-01T00:00:00Z

Title: Antioxidant Property and Free Radical Scavenging Activity of Hedyotis scandens (Roxb). Rubiaceae Authors: Ralte, Vanlalhruaii Abstract: Hedyotis scandens Roxb is a common medicinal plant locally utilised for the treatment of diseases in many communities, especially in Mizoram. However, scientific evidence for its therapeutic properties is quite poor and no scientific validation is available of its antioxidant capacity, as per our knowledge. Therefore, the present study aims to investigate the phytochemical constituents and therapeutic potential of the aqueous leaf extract of Hedyotis scandens Roxb. Free radical scavenging activity was determined in a cell free system. The aqueous leaf extract of Hedyotis scandens inhibited the generation of ABTS 2, 2’- azinobis-( 3-ethylbenzothiazoline-6-sulfonic acid), DPPH (1, 1-diphenyl-2-picrylhydrazyl) and nitric oxide in a concentration dependent manner. The IC50 for DPPH was found to be 68.03 ± 0.15 μg/ml, IC50 for ABTS was 53.165 ± 0.3 μg/ml and the IC50 for Nitric oxide scavenging activity was found to be 173.15 ± 0.25μg/ml. Phytochemical analysis of the plant extract revealed the presence of 23.67 ± 0.003 GAE mg/g of Total Phenolic Content and 27.44 ± 0.28 QE mg/g of Total Flavonoid Content. The total antioxidant activity of the plant extract when compared to standard Ascorbic acid was found to be 51.11 ± 1.03 AE mg/g. The reducing power assay showed concentration dependent activity against potassium ferricyanide.

2022-01-01T00:00:00Z Ralte, Vanlalhruaii http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/537 2024-06-11T10:01:28Z 2005-09-01T00:00:00Z

Title: Changes in microbial biomass and activity in relation to shifting cultivation and horticultural practices in subtropical evergreen forest ecosystem of north-east India Authors: Ralte, Vanlalhruaii Abstract: The present study conducted in the Nokrek biosphere reserve (BR) of Meghalaya in north-east India aimed at analyzing the impact of human activities such as shifting agriculture (‘Jhum’) and horticultural practices on temporal and spatial changes in microbial biomass and dehydrogenase and urease activities in soil. Microbial biomass-C (MBC) and -N(MBN) as well as dehydrogenase and urease activities were significantly (P < 0.01) greater in the soils of the undisturbed forest ecosystem in core zone of the BR than the soils under various land use practices in the buffer zone of the BR. The microbial biomass-N in the surface soil layer (0–10 cm) was maximum (285.4 μg g–1) in the undisturbed core zone and minimum (75.1 μg g−1) in the 1-year-old jhum fallow, which was subjected to intense human activities. Similarly, dehydrogenase (TPF released = 0.70 μg g−1 24 h−1) and urease activities (NH4 released = 31.56 μg 100 g−1 6 h−1) were maximum in the undisturbed core zone and minimum (TPF released = 0.37 μg g−1 24 h−1 and NH4 released = 10.78 μg 100 g−1 6 h−1, respectively) in the 1-year-old jhum fallow. Thus, human activities in the buffer zone of the BR were responsible for significant reduction in both microbial biomass-N and enzyme activities. Both these properties showed recovery during regrowth of vegetation on jhum fallows. Microbial biomass-N and enzyme activities declined significantly (P < 0.01) with increasing soil depth at all the sites. Seasonal variations in both microbial biomass-N and enzyme activities at all sites were also significant (P < 0.01) with peak in autumn and trough in winter.

2005-09-01T00:00:00Z