A new triterpenoid from Lantana camara     

Yadav SB  Tripathi V 《Fitoterapia》2003,74(3):320-321

A new ursane was isolated from the leaves of Lantana camara and its structure elucidated as 3,24-dioxo-urs-12-en-28-oic acid (1) by means of spectral analysis.  相似文献   

Occurrence of 'Candidatus Phytoplasma aurantifolia' (16SrII group) in cassava and four other species in Uganda     

Y. Arocha  R. Echodu  D. Talengera  J. Muhangi  E. Rockefeller  O. Asher  R. Nakacwa  R. Serugga  G. Gumisiriza  J. Tripathi  D. Kabuye  M. Otipa  K. Vutseme  M. Lukanda  E. Boa 《Plant pathology》2009,58(2):390-390

  相似文献   

Impact of phorate on malate dehydrogenases, lactate dehydrogenase and proteins of epigeic, anecic and endogeic earthworms     

G. Tripathi  N. Kachhwaha  I. Dabi 《Pesticide biochemistry and physiology》2009,95(2):100-105

The effects of an organophosphate pesticide phorate on cytoplasmic malate dehydrogenase (cMDH), mitochondrial malate dehydrogenase (mMDH), lactate dehydrogenase (LDH), supernatant and mitochondrial proteins of an epigeic (Perionyx sansibaricus), anecic (Lampito mauritii) and endogeic (Metaphire posthuma) earthworms were studied. The treatment of different concentrations (20, 40, 80 and 160 ppm) of phorate for 16 days gradually decreased the specific activities of cMDH, mMDH and LDH as well as cytoplasmic and mitochondrial protein contents. This showed the inhibitory effect of phorate on metabolic enzymes and proteins in tropical earthworms. The inhibition was dose- and time-dependent. The inhibitory response in mitochondrial enzyme (mMDH) and protein was somewhat earlier and more as compared to the inhibitory effect of phorate on cytoplasmic enzymes (cMDH, LDH) and protein. This indicates a greater interference of phorate in cellular respiration of earthworms. The phorate related decreases in enzyme and protein profiles were about 60% and 58% in P. sansibaricus, 54% and 49% in L. mauritii and 47% and 42% in M. posthuma, respectively. It reflects phorate-induced substantial decline in protein synthesis and aerobic and anaerobic capacity of earthworms. The maximum effect of phorate was on epigeic earthworm followed by anecic and endogeic species. The present findings suggest the differential sensitivity of different earthworm species in enzymatic and protein responses to phorate and the sensitivity was associated with the ecophysiological categories of earthworms.  相似文献   

Dissimilar effects of human and elephant disturbance on woodland structure and functional bird diversity in the mopane woodlands of Zambia     

Tripathi  Hemant G.  Mzumara  Tiwonge I.  Martin  Rowan O.  Parr  Catherine L.  Phiri  Chaona  Ryan  Casey M. 《Landscape Ecology》2019,34(2):357-371

Landscape Ecology - Humans and elephants are major disturbance agents in the African savanna woodlands. While both species remove trees, humans selectively harvest larger stems, which are less...  相似文献   

Litterfall, litter decomposition and nutrient release patterns in four native tree species raised on coal mine spoil at Singrauli, India   总被引：16，自引：0，他引：16  

K. P. Singh  P. K. Singh  S. K. Tripathi 《Biology and Fertility of Soils》1999,29(4):371-378

 Litterfall, leaf litter decomposition and N and P release were studied in four tree species (Dalbergia sissoo, Azadirachta indica, Pongamia pinnata and Shorea robusta) planted on a mine spoil habitat. Annual litterfall varied from 1220 kg ha^–1 in the S. robusta stand to 3620 kg ha^–1 in the A. indica stand. The fast-growing species A. indica and D. sissoo exhibited higher litter production in comparison to the other two slow-growing species. The total N returned to the soil through litterfall ranged from 8.6 kg ha^–1 year^–1 in the S. robusta stand to 36.5 kg ha^–1 year^–1 in the D. sissoo stand. The annual percent leaf litter mass loss was distinctly greater in A. indica (73%) and D. sissoo (69%) in comparison to P. pinatta (59%) and S. robusta (47%). The mean relative decomposition rates of leaf litter material were maximum in the rainy season and minimum in summer. Rainfall and its associated variables exhibited greater control over litter docomposition than temperature. Lignin and water-soluble compounds were better predictors of annual mass loss rates accounting for 90% variability. Mass loss was positively correlated with N and P mineralization rates. Lignin was the best predictor of annual N and P mineralization rates. Nutrient release pattern differed; constant release occurred in A. indica, initial release followed by delayed immobilization and release occurred in D. sissoo and P. pinnata, and initial immobilization followed by gradual release was noticed in S. robusta. A. indica and D. sissoo, showing high litterfall and rapid litter decomposition rate, hold promise for the rehabilitation of nutrient-poor coal mine spoils. On the other hand, S. robusta with less litterfall and a slow decomposition rate may prove disadvantageous. Received: 10 March 1998  相似文献   

Physicochemical and Gel Properties of Myofibrillar Protein from Sin Croaker (Johnius dussumieri) Fish During Ice Storage     

Naresh Kumar Mehta  Mithlesh K. Chouksey  Amjad K. Balange  Gayatri Tripathi 《Journal Of Aquatic Food Product Technology》2017,26(1):71-85

The physicochemical and gel properties of myofibrillar protein (MFP) from sin croaker fish were studied during ice storage for 18 days. Significant changes in the trends of solubility, Ca²⁺ ATPase enzyme activity, surface hydrophobicity, and water holding capacity of extracted MFP were observed by the 6th day of storage. The Ca²⁺ ATPase enzyme activity reduced significantly (p < 0.05) by the 6th day of storage. However, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) did not show a remarkable change in the concentration of myosin heavy chain. Surface hydrophobicity increased almost four times from its original value of 18.98 µg; whereas, water holding capacity showed a fluctuating trend during storage. The emulsion capacity of the MFP was in the range of 0.89- to 1.92-mL oil/mg protein during storage. The gel strength value (313.45 g.cm) of heat-induced gel prepared from fresh minced meat decreased significantly (p < 0.05) by the 6th day of ice storage. Texture profile analysis revealed that changes in hardness and gumminess were concurrent to steeply reducing breaking force up to the 6th day. The histological observation showed gradually increasing gaps between muscle fibers. The histological observations and physicochemical quality indicated that the sin croaker fish can be used for producing good quality surimi when stored for up to 6 days in ice.  相似文献   

Review on Biotechnological advances in Vigna radiata and their future prospects     

Tripathi  Ayushi  Debnath  Samir  Shukla  Susmita 《Journal of Crop Science and Biotechnology》2021,24(3):245-258

Journal of Crop Science and Biotechnology - Mungbean (Vigna radiata L. Wilczek) is an unique source of protein supplement with full of benefits as medicinal and climate friendly crop. Hence from...  相似文献   

Nutrient management and submergence-tolerant varieties antecedently enhances the productivity and profitability of rice in flood-prone regions     

Priyanka Gautam  B. Lal  A. K. Nayak  R. Tripathi  M. Shahid  B. P. Meena 《Journal of plant nutrition》2013,36(16):1913-1927

Abstract

Poor productivity of rice in rainfed lowlands is due to complete submergence as it is a major abiotic stress of these regions. For enhancing the rice productivity of these areas, better nutrient management options are required and results may even better when combined with stress tolerant cultivars, even when tested under natural conditions of farmers’ field. For supporting the above statement, the effect of nitrogen and phosphorus in graded doses was evaluated for submergence tolerance in controlled conditions and the results obtained were tested and validated at farmers’ field in Cuttack, Odisha, India. Shoot elongation, leaf senescence and lodging were lowest with the application of higher phosphorus (60?kg ha^?1). Highest dose i.e. 100-60-40 NPK kg ha^?1 resulted in higher plant survival of all the varieties by 90–170% over no nutrient application, it was also reflected in the higher growth after recovery, leaf greenness, leaf and stem growth, chlorophyll and carbohydrate concentrations and ultimately higher grain yield. At farmers’ field, application of basal P, K and post-flood N management practice resulted in overall better performance of Swarna and Swarna-Sub1 showing higher yield attributes leading to 65.7 and 37.9% higher grain yield, over conventional practices followed by farmers. Apart from that results were more positive if post-flood nitrogen was applied as urea foliar spray might be due to quick absorption of N by plant leaves and also spraying helps in removing the silt of flood water sticking to the leaf surface and facilitated the plants to photosynthesize and survive after desubmergence. These cost-effective management options may enhance the productivity and profitability of rice in the flood-prone areas where farmers hesitate to apply nutrients.  相似文献   

Monitoring of meteorological drought and its impact on rice (Oryza sativa L.) productivity in Odisha using standardized precipitation index     

R. Raja  A.K. Nayak  B.B. Panda  B. Lal  Rahul Tripathi  Mohammad Shahid 《Archives of Agronomy and Soil Science》2013,59(12):1701-1715

The dynamics of meteorological drought and its relationship with block level rice productivity over the Eastern Indian state of Odisha was assessed during the wet season (June to November) using the standardized precipitation index (SPI). The time series of rainfall data (1983–2008) from 168 rain gauge stations was used to derive the 1- and 3-month SPI of different wet season months. The 1- and 3-month SPI data were interpolated to map spatial patterns of meteorological drought and its severity, and the maps of a drought (2008) and normal (2007) year were discussed in detail. Further, the time series of SPI was exploited to assess the drought risk in Odisha. Correlation analysis of 1- and 3-month SPI with rice productivity index (RPI) showed that the SPI of 1-month time scale particularly in July (r = 0.49) and October (r = 0.33) had significantly stronger relationship with RPI than any of the 3-month SPI individually during wet season. The cumulative degree of severity of drought could be better explained by 3-month SPI map when drought events are well spread in the preceding months. Regression models were developed using 1- and 3-month SPI for forecasting rice productivity of blocks with varying proportion of rainfed area in Odisha. Model developed based on 1-month SPI accounted for 27% yield variability in rice and could be used for forecasting rice productivity.  相似文献   

Monitoring the genetic fidelity of micropropagated plantlets of Spondias mangifera Willd. using RAPD marker assays     

Madhu Tripathi  Neha Prakash Rai  Govind Kumar Rai  Major Singh 《The Journal of Horticultural Science and Biotechnology》2013,88(5):451-454

Summary

Random amplified polymorphic DNA (RAPD) markers were used to screen for clonal fidelity in in vitro-propagated plantlets of Spondias mangifera produced through direct organogenesis. One micropropagated plantlet was selected at random after each sub-cultural passage (six sub-cultures), along with the donor plant, for RAPD marker analysis. Twenty-five RAPD primers were used to study genetic similarities or dissimilarities with the mother plant as well as among the regenerated plants. Individual primers showed that the same pattern of RAPD markers was shared by all in vitro-propagated plantlets and the mother plant. No variation was observed among the micropropagated progenies. Thus, in vitro-regenerated plantlets of S. mangifera were clonally uniform and genetically stable.  相似文献