Browsing by Author "M.K. Tripathi"

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Comparative efficacy of neem based and chemical pesticides for management of root-knot nematode in tomato
(2000) M.K. Tripathi; R.C. Pandey; S.N. Rai
An experiment was conducted during Rabi season (1995-96) in Insectory, Department of Entomology, CSAUA and T, Kanpur to evaluate the various neem based pesticides along with some commonly used chemical pesticides for the management of root-knot nematode (Meloidogyne incognita) in tomato crop. Nimbecidine was found to be most effective which produced maximum tomato yield (38.74 mt/ha) followed by Nimbosol (35.98 mt/ha), Achook (33.41 mt/ha) and Suneem (30.94 mt/ha). Among the chemical pesticides phorate produced highest yield (30.48 mt/ha), cypermethrin (28.02 mt/ha) and phosphamidon (24.83 mt/ha) against control (14.98 mt/ha). Number of galls formed in roots and tomato yield was negatively correlated (r = -0.9162).
Effect of aging on the dissolution rate of nalidixic acid tablets
(Informa Healthcare, 1994) J.K. Pandit; A.K. Wahi; S.P. Wahi; B. Mishra; M.K. Tripathi
Investigation of the dissolution rate profiles of nalidixic acid tablets of three commercial brands was carried out. Using the U.S.P. paddle method, significant inter-brand variations in dissolution rates were found and the tablets did not pass the U.S.P. dissolution test. The dissolution of the tablets was also found to be adversely affected on aging. The observed differences in dissolution rates of the tablets examined were unrelated to their disintegration times. An attempt was made to improve the dissolution rate of nalidixic acid tablets through hydrophilization of nalidixic acid powder and use of tablet excipients with high aqueous solubility were found to yield tablets of good physical qualities which were unaffected on aging. © 1994 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.
Genotype-Environment Interaction for Quality Traits in Tomato Hybrids
(Springer, 2022) H.R. Bhandari; Kartikeya Srivastava; M.K. Tripathi; Babita Chaudhary; S. Biswas
Breeding for quality traits in tomato has got boost due to enormous consumer and industrial demand owing to its exceptional nutritional benefits and attributes required for processing industries. Newly evolved varieties/hybrids need recommendation based on their adaptive specificity as a consequence of genotype-environment interaction. Hence, present study analysed comparative stability of 30 hybrids of tomato along with one check hybrid (To 3150) for important quality traits viz., total soluble solids (TSS), titrable acidity, ascorbic acid, carotene and lycopene content based on data of three locations over two years. The identified stable hybrids were Columbia × EC 538380, H 86 × EC 620541 and EC 620541 × EC 620438) for TSS, Superbug × EC 620438 for titrable acidity, Columbia × EC 620438 for ascorbic acid and NDTVR 73 × EC 620541 for carotene content. None of the hybrids was found stable for lycopene content. Stability for one trait was independent of stability of other traits. The responsive hybrids were Columbia × BS 24–2 (for TSS and carotene content), EC 521087 × EC 538380 (for ascorbic acid and carotene content), EC 620438 × EC 538380 (for ascorbic acid, carotene and lycopene content). The environments of Varanasi during both the years had favourable effect on all quality traits except carotene content as evident from environmental indices. The hybrids identified as stable are broad-adapted and can be recommended for general cultivation under different locations while the hybrids identified as responsive can be recommended for specific environments only. © 2021, NAAS (National Academy of Agricultural Sciences).
Identification and structure elucidation of antimicrobial compounds from Lyngbya aestuarii and Aphanothece bullosa
(Cellular and Molecular Biology Association, 2014) M. Kumar; P. Singh; J. Tripathi; A. Srivastava; M.K. Tripathi; A.K. Ravi; R.K. Asthana
Cyanobacteria are known to produce array of compounds. In an earlier report, we reported antibacterial and antifungal activities in methanolic crude extracts of laboratory grown Lyngbya aestuarii and Aphanothece bullosa isolated from Chilka Lake and local paddy field respectively. In this report the same methanolic crude extracts were subjected to TLC purification twice by altering the solvents and UV-illuminated bands bioassayed. Such UV illuminated potent bands obtained after 2nd TLC were subjected to spectroscopic analysis (UV, IR, 1H NMR and LCMS/MS). We have screened malyngolide and dragonamide C from L. aestuarii and a diterpenoid and majusculoic acid from A. bullosa. Dragonamide C and malyngolide were found to be antifungal while majusculoic acid and a diterpenoid as antibacterial. As far as our knowledge goes, this is the first ever report where fresh water A. bullosa was found to be a source of diterpenoid and majusculoic acid. Likewise, L. aestuarii was also established as a source of malyngolide and dragonamide C. This again indicated that cyanobacteria are inherently endowed with the capacity to produce metabolites according to niche and species specific manner emphasising fresh water cyanobacterial strain are as important as marine one. © 2014.
In vitro fermentation and methane production with diets of varying roughage (Prosopis cineraria leaves) to concentrate ratio
(Indian journals, 2017) P. Meena; A. Uddin; M.K. Tripathi; V.K. Paswan
The experiment was conducted to study the effect of varying concentrate levels in diets with Prosopis cineraria dry leaves on in-vitro fermentation characteristics and methane production. Three composite feed mixtures (CFM) were prepared using Prosopis cineraria (Khejri) dry leaves as roughage source and barley grain in ratio of 80:20 (D1), 60:40 (D2) and 40:60 (D3) respectively, along with 2% mineral mixture and 1% common salt. The in-vitro dry matter digestibility (IVDMD), metabolites and methane production were measured for 24 h fermentation. In-vitro experiment revealed that increasing concentrate levels improved (P < 0.05) the IVDMD of diets, which ranged from 70.18 to 74.25% and remained highest in D3. Total gas (ml/g DDM) and methane (g/kg DDM) production as well as ME (MJ/ kg DM) production were increased (P < 0.05) with increasing levels of concentrate in the diets. There was a non-significant decrease in the pH of fermentation medium on increasing concentrate levels in the diets. TCA-ppt protein was reduced (P < 0.05) whereas NH3N, TVFA and protozoa population increased (P < 0.05) by increasing concentrate levels in the diets. It is concluded that increasing level of concentrate improved total gas and methane production along with IVDMD. Methane production was lowest in diets having more Prosopis cineraria dry leaves because of high content of tannins in it, which inhibits the production of methane and reduced the population of protozoa.