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Search Results: 1 - 10 of 333205 matches for " R.K. VERMA "
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Nitschkia tectonae — a new ascomycete on teak from central India
R.K. VERMA
Indian Phytopathology , 2011,
Abstract: Nitschkia tectonae sp. nov. is described, illustrated and compared with allied taxa from India on dead stem of teak (Tectona grandis).
DNA sequence comparison based on Tabular Representation
Archana Verma,Mr. R.K.Bharti,Prof. R.K. Singh
International Journal of Computers & Technology , 2013,
Abstract: DNA sequence comparison remains as one of the critical steps in the analysis of phylogenetic relationships between species. In order to get quantitative comparison, we want to devise an algorithm that would use the tabular representation of DNA sequences. The tabular approach of representation captures the essence of the base composition and distribution of the sequence. In this contribution, we take the tabular notation for DNA sequences and then these tables are compared to find the similarity/dissimilarity measure of the sequences. We have developed algorithms for comparing DNA sequences. These programs help us to search similar segments of sequences, calculate similarity scores and identify repetitions based on local sequence similarity. There are two approaches: one is to find the exact similarity and another is to find the measurement for similarity. The first approach is more sensitive, which can be used to search DNA sequence similarities only if complete matches occurred and can compare exactly similar sequences only. This approach violates if a single mismatch for any base character appears so it is not a general solution. To find the miss matches along with the matches we have suggested another approach which compiles the information matrix based on matches and miss matches. This approach is quiet general in terms of sequences which have a large fragment common with less no of dissimilar base characters. This alternate approach includes an additional step in the calculation of the similarity score that denotes multiple regions of similarity between sequences. For both these approaches computer programs are prepared and tested on data sets. These programs can be used to evaluate the significance of similarity scores using a shuffling method that preserves local sequence composition. In addition, these programs have been generalized to allow comparison of DNA sequences based on a variety of alternative scoring matrices. We have been developing tools for the analysis of protein The method is very simple and fast, and it can be used to analyze both short and long DNA sequences. The utility of this method is tested on the several sequences of species and the results are consistent with that reported.
BIOECOLOGY OF DIORYCTRIA ABIETELLA DENIS AND SCHIFF. A PEST OF CONIFERS IN THE NORTH-WESTERN HIMALAYA
T.D. VERMA,R.K. GAUR
BIOTROPIA : the Southeast Asian Journal of Tropical Biology , 1994,
Abstract: Cones and seeds of conifers, such as Pinus roxburghii, P. wallichiana, P. gerardiana, Cedrus deodara, Abies pindrow and Picea smithiana are seriously damaged by Dioryctria abietella Denis and Schiff. (Lepidoptera : Pyralidae) in the North-Western Himalayan region of India. Bioecological studies carried out during 1991 - '92 revealed that the females laid whitish, elliptical eggs singly on the depressed surface of the young cones. The average egg size was 1.00 ± 0.11 x 0.60 ±0.08 mm and this stage lasted for 3 - 5 days. The larval stage passed through five instars. All the instars differed in appearance, size and duration and larvae became full-fed in an average of 24.8 ± 1.9 days. The full-fed larva spun a cocoon around itself, sealed it with white papery membrane and pupated inside the cone or any other outside protected place. The prepupal and pupal periods lasted for 7-8 and 10-14 days, respectively. The pupa was dark brown, 13.8 ± 0.07 mm in length. Total period from egg to adult varied from 46 to 59 days (52.7 ±4.8 days). Adults were dirty brown in appearance and were 13.59±0.115 mm long with an average wing expanse of 29.0 ± 1.00 mm. They lived for 4 to 5 days. Under laboratory conditions, the pest completed two generations per year and full-fed larvae of 3rd generation overwintered during September - October. Two larval parasites belonging to order Hymenoptera and Diptera, and a fungal pathogen (Fusarium sp.) were found associated with this pest. The detailed biology, nature and extent of damage, along with its distribution have been discussed and methods of control suggested.
On the Spatio-Temporal Variations of the Tropopause Height over India and Indian Summer Monsoon Activity
JR Kulkarni,RK Verma,
J.R. Kulkarni
,R.K. Verma

大气科学进展 , 1993,
Abstract: The spatio-temporal variation of the tropopause height (TH) over the Indian region (5°N-35°N, 70°E-95°E) has been studied using monthly mean TH data, for 22-year period, 1965 to 1986. The study revealed that the stations south of 20° showed maximum TH in April / May and minimum in September. This variation in TH has been attributed to the corresponding variation of average sea surface temperature (SST) over ± 20° latitudinal belt over Indian Ocean, Arabian Sea and Bay of Bengal. Further the stations north of 20°N showed maximum in June and minimum in October/ November. This maximum in TH has primarily been attributed to the increased insolation and convection. Furthermore it is noticed that the anomaly of TH moved northwards during the period April to July.The interannual variability of the Indian Summer Monsoon Activity (ISMA) has been studied in relation to all India mean TH (at 12 GMT) for six months April through September. The composites of mean TH for good and bad monsoon years showed that all India mean TH is statistically higher in good monsoon years than in bad monsoon years. The relationship between ISMA and all India mean May TH has been studied using the contingency table. The study suggested that the forecast of ISMA could be prepared using mean May TH.
Essential Oil Composition of Menthol Mint (Mentha arvensis) and Peppermint (Mentha piperita) Cultivars at Different Stages of Plant Growth from Kumaon Region of Western Himalaya
R.S. Verma,L. Rahman,R.K. Verma,A. Chauhan
Open Access Journal of Medicinal and Aromatic Plants , 2010,
Abstract: Menthol mint (Mentha arvensis L.) and peppermint (M. piperita L.) cultivars grown in Kumaon region were evaluated for essential oil content and composition at different stages of crop growth. In men-thol mint cultivars viz., ‘Kosi’, ‘Saksham’, ‘Himalaya’, and ‘Kalka’, the essential oil content was found to vary from 0.3% - 1.2%, 0.42% - 1.1%, 0.38% - 1.0% and 0.26% - 1.2%, at different days after transplanting (DAT) respectively, while in cultivars ‘Kukrail’, ‘CIM-Madhurus’ and ‘CIM-Indus’ of peppermint, it varied from 0.28% - 0.6%, 0.19% - 0.55% and 0.17% - 0.37%, respectively at different DAT. The menthol content in all the menthol mint cultivars reached higher values at 120 and 150 DAT. In case of peppermint cultivars viz., Kukrail’, ‘CIM-Madhurus’ and ‘CIM-Indus’, menthol content varied from 32.92% - 39.65%, 34.29% - 42.83% and 22.56% - 32.77%, respectively during the crop growth.
VOLATILE TERPENOID COMPOSITION OF ROSMARINUS OFFICINALIS, "CIM-HARIYALI": VARIABILITY IN NORTH INDIA DURING ANNUAL GROWTH
R.S VERMA,L RAHMAN,S MISHRA,R.K VERMA
Journal of the Chilean Chemical Society , 2012,
Abstract: To investigate the seasonal influence on essential oil content and composition of rosemary (Rosmarinus of ficinalis) cultivar 'CIM-Hariyali' a study was conducted in Kumaon region of western Himalaya. Essential oil content was found to vary from 1.0% to 1.14% during the year. GC and GC-MS analyses enabled to identify thirty components representing 95.33% - 97.03% of the total oil composition. Main components of the oils were 1,8-cineole (22.61% - 23.85%), camphor (24.40% - 25.85%), α-pinene (10.74% - 12.59%), verbenone (4.90% - 5.77%), camphene (5.46% - 6.16%), β-pinene (3.28% - 4.02%), limonene (2.86% - 3.39%) and ,S-myrcene (1.89% - 1.95%). The study clearly showed that there were no drastic changes in the essential oil content and composition of rosemary due to season. Therefore, the crop may be harvested in any season to get good quality oil in hilly region of north India.
A new species of Corynespora from central India
NIDHI SHARMA, K.K. SONI, JAMALUDDIN and R.K. VERMA
Indian Phytopathology , 2012,
Abstract:
A new species of Mystrosporiella causing leaf spot of Terminalia bellerica
NIDHI SHARMA*, K.K. SONI, JAMALUDDIN and R.K. VERMA
Indian Phytopathology , 2012,
Abstract:
Long-term Cyclic Irrigation in Subsurface Drained Lands: Simulation Studies with SWAP
A.K. Verma,S.K. Gupta,R.K. Isaac
Journal of Agricultural Science , 2012, DOI: 10.5539/jas.v5n1p84
Abstract: SWAP (Soil-Water-Atmosphere-Plant) version 2.0 was evaluated for its capability to simulate the crop growth and salinity profile for cyclic irrigation of saline waters at Sampla (India) having shallow water table provided with a subsurface drainage system. Cyclic mode with canal water (EC=0.4 dS m-1) and saline drainage water (EC=12.5-15.5 dS m-1) were used to calibrate and validate the model for the years 1989-91. Canal water was used for pre-sowing irrigation and thereafter, canal and saline drainage waters were used as per pre-decided irrigation modes like all CW, CW:DW, 2CW:2DW, DW:CW, and 1CW:3DW. Absolute deviations and standard error between the SWAP simulated and observed relative yields during calibration ranged from 1.3 to 1.8% and 1.7 to 2.2% respectively. A close agreement was observed between the measured and simulated soil salinity profile. It established the validity of SWAP model under the experimental conditions prevalent at the site. It could also be concluded that the crops could be grown very well under subsurface drainage conditions; but, in dry rainfall years, salinity build-up might occur. To achieve a yield potential exceeding 80%, it could be suggested that cyclic use of saline waters such as 1CW:1DW and 2CW:2DW could be used in such years. A pre-sowing irrigation with canal water could be helpful to overcome the build-up of salts and salt amount washing depends upon the rainfall. Thus, there seems to be no fear of use of cyclic irrigation under drained conditions. The same fact was established through the use of model SWAP.
Effect of feed supplement on Milk Production, Fat % Total Serum Protein and Minerals in Lactating Buffalo
R.K. Verma,Praveen Kumar,A. Adil and G.K. Arya
Veterinary World , 2009,
Abstract: A study was carried out to see the effect of feed supplement “Khurak” on milk yielding buffalo. The buffaloes were divided in two group. One group was offered “Khurak” as feed supplement for 7 days. Significant increase was observed in milk production, Total serum protein and calcium in khurak supplemented group (Treatment group). [Vet. World 2009; 2(5.000): 193-194]
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