Polyphenolic compounds, antioxidant capacity, and quinone reductase activity of an aqueous extract of Ardisia compressa in comparison to mate (Ilex paraguariensis) and green (Camellia sinensis) teas   总被引：5，自引：0，他引：5  

Chandra S  De Mejia Gonzalez E 《Journal of agricultural and food chemistry》2004,52(11):3583-3589

Aqueous extracts of the leaves of Ardisia compressa (AC) have been used in folk medicine to treat various liver disorders including liver cancer. The objective of this study was to partially characterize and determine the total polyphenol content, antioxidant capacity, and quinone reductase activity of A. compressa tea in comparison to mate (Ilex paraguariensis, MT) and green (Camellia sinensis,GT) teas. Total polyphenol content, antioxidant capacity, and phase II enzyme induction capacity were measured by the modified Folin-Ciocalteu, ORAC, and quinone reductase (QR) assays, respectively. The major polyphenols in AC were not catechins. HPLC retention times and standard spikes of AC indicated the presence of gallic acid, epicatechin gallate, ardisin and kaempferol. Using catechin as standard, the total polyphenol value of AC (36.8 +/- 1.1 mg/mg DL) was significantly lower than GT (137.2 +/- 5.8 mg equivalent of (+)-catechin/mg dried leaves, DL) and MT (82.1 +/- 3.8 mg/mg DL) (P < 0.001). Antioxidant capacity (AC, 333; GT, 1346; MT, 1239 mmol Trolox equivalents/g DL) correlated with total polyphenol values (r(2) = 0.86, P < 0.01). AC (4.5-12.5 microg/mL) induced QR enzyme, in Hepa1c1c7 cells, up to 15%. MT and GT showed no induction at the concentrations tested (0.5-10.5 and 0.5-12.5 mg/mL, respectively). These results suggest that AC has a different mechanism of protection against cytotoxicity that is not related to its antioxidant capacity. Further studies are needed to determine such mechanisms and to explore its potential as a chemopreventive or therapeutic agent.  相似文献   

Effect of Castor Oil on Soil Erosion by Water     

Subhash Chandra  S. K. De 《植物养料与土壤学杂志》1980,143(1):93-97

Soils from six different regions of the State of Uttar Pradesh, India, were treated with 1% and 2% concentrations of castor oil and incubated for 15 days and 30 days time. The erosion coefficients of natural as well as treated soils were determined with a simple laboratory erosion apparatus. The castor oil was found to be highly effective in reducing soil erosion. It was more effective in light texture soils with reduction in erosion coefficients to the extent of 88 70. Heavy textured soils also registered good reduction in erosion coefficient, to the extent of 20 %. The castor oil was effective in both the concentrations and both the incubation periods. Similarly, it was effective at all the four slope levels viz. 1, 2, 4 and 8%. The castor oil has been found much superior than cellulose and protein as far as their capability to check soil erosion is concerned.  相似文献   

Seroprevalence of bluetongue and presence of viral antigen and type-specific neutralizing antibodies in goats in Tripura,a state at Indo-Bangladesh border of northeastern India     

De  Ankan  Das  Tapan Kumar  Chand  Karam  Debnath  Bikas Chandra  Dey  Saikat  Hemadri  Divakar  Barman  Nagendra Nath  Chaudhary  Jitendra Kumar  Muthuchelvan  Dhanavelu  Saxena  Arpit  Tewari  Neha  Chauhan  Ankita  Lohumi  Ankita  Biswas  Sanchay Kumar 《Tropical animal health and production》2019,51(1):261-265

Tropical Animal Health and Production - Bluetongue (BT) is a notifiable multiple species transboundary viral disease of domestic and wild ruminants. Though the disease is enzootic in India, little...  相似文献   

Bluetongue in sheep in Nepal     

Jha VC  Bista KS  Tamang KK 《The Veterinary record》2008,162(9):288

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Phosphate solubilization by Chryseobacterium sp. and their combined effect with N and P fertilizers on plant growth promotion     

Ajay Veer Singh  Ramesh Chandra  Reeta Goel 《Archives of Agronomy and Soil Science》2013,59(5):641-651

The capabilities of soil microorganisms to solubilize phosphate have been known for many years, but their isolation and use as crop inoculants have met with little success. Thirty-five bacterial isolates were screened for their phosphate-solubilizing ability, and two of them, PSR10 and RGR13, identified through 16S rDNA sequencing as Chryseobacterium sp. PSR10 and Escherichia coli RGR13, respectively, screened for plant growth promotion in the greenhouse. Seed inoculation of Macrotyloma uniflorum (horsegram) by Chryseobacterium sp. PSR10 showed better plant growth promotion in sterilized and unsterilized soil under greenhouse conditions and was selected for a field experiment with 100, 50 and 30% of recommended doses of nitrogen and phosphorus fertilizer. Seed inoculation with 50% of the recommended dose of nitrogen and phosphorus increased plant growth (agronomical parameters, chlorophyll content, nitrate reductase activity, phosphorus content and crop yield). We conclude that effective plant growth-promoting bacterium Chryseobacterium sp. PSR10 broadens the spectrum of phosphate solubilizers available for field applications and might be used together with 50% dose of nitrogen and phosphate.  相似文献   

Growth and Development of Soybean (Glycine max [L.] Merr.) Cultivars under Shade in Coconut Garden     

R. Chandra  Babu M. Nagarajan 《Journal of Agronomy and Crop Science》1993,171(4):279-283

The growth and development of seven soybean cultivars were studied under shade in a coconut garden. Higher shoot height, internodal elongation and lower leaf area index were the most significant growth changes noticed under shade. Leaf net photosynthesis, crop growth rate and seed yield were also reduced under shade. The cultivars CO 1, UGM 30 and UGM 37 recorded higher yield under shade when compared to other cultivars tested.  相似文献   

Winter water relations of New England conifers and factors influencing their upper elevational limits. II. Modeling     

Boyce RL  Vostral CB  Friedland AJ 《Tree physiology》2002,22(11):801-806

We used the water relations model, WINWAT, to model winter water relations of three conifer species-eastern hemlock (Tsuga canadensis (L.) Carr.), eastern white pine (Pinus strobus L.) and red pine (P. resinosa Ait.)-growing at their upper elevational limits on Mt. Ascutney, Vermont, USA, in the winters of 1997 and 1999. Modeled relative water contents remained above 60% in the two youngest foliar age classes of all three species during both winters, indicating that desiccation stress in winter is not responsible for setting the upper elevational limits of these species at this site under present climatic conditions. WINWAT indicated that winter water relations of these low-elevational species were sensitive to low relative humidity, which increased transpiration rates, and low temperatures, which inhibited recharge, but are much less sensitive to summer climate than in the case of subalpine conifers in Colorado. Our results indicate that summer and winter temperatures and relative humidities (or precipitation/potential evapotranspiration ratios) should be incorporated into climate change models designed to simulate future tree distributions.  相似文献   

Isolation of Mycobacterium spp. from milking buffaloes and cattle in Nepal     

Jha VC  Morita Y  Dhakal M  Besnet B  Sato T  Nagai A  Kato M  Kozawa K  Yamamoto S  Kimura H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2007,69(8):819-825

In Nepal, mycobacterial isolates obtained from the milk and feces of buffaloes and cattle that were positive for the single intradermal cervical tuberculin (SICT) tests were genetically identified. A total of 36 mycobacterial strains were isolated from 39% of the buffaloes (14 of 36) and 34% of the cattle (11 of 32). Of the 36 strains, 13 were identified as M. bovis, and these strains were isolated from 17% of the buffaloes (6 of 36) and 16% of the cattle (5 of 32). M. bovis was isolated from both the milk and feces of one buffalo and one cattle, the milk alone of three buffaloes and three cattle, and the feces alone of two buffaloes and one cattle. These results suggest that milking buffaloes and cattle infected with M. bovis exist in Nepal. The remaining 23 strains were atypical mycobacteria. A program for the elimination of bovine tuberculosis should be implemented as soon as possible, and the public health education and proper hygienic practices may be required.  相似文献   

Estragole,a potential attractant of the winged melon aphid Aphis gossypii     

Subhash Shivaramu  Saravan Kumar Parepally  Varun Yennurukadirenahalli Byregowda  Kamala Jayanthi Pagadala Damodaram  Anuj Bhatnagar  Kailash Chandra Naga  Sanjeev Sharma  Manoj Kumar  Vivek Kempraj 《Pest management science》2023,79(7):2365-2371

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Functional response of an egg parasitoid,Trichogramma chilonis Ishii to sublethal imidacloprid exposure     

Aishwarya Ray  Basana Gowda Gadratagi  Neeraj Budhlakoti  Dhanendra Kumar Rana  Totan Adak  Guru Pirasanna Pandi Govindharaj  Naveenkumar Basavanagouda Patil  Annamalai Mahendiran  Prakash Chandra Rath 《Pest management science》2023,79(10):3656-3665

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