2009
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PublicationArticle Variability in quality components of RILs in chilli (Capsicum annuum L.)(International Society for Horticultural Science, 2009) J. Pandey; J. Singh; A. Verma; A.K. Singh; M. Rai; A.K. Pandey; S. KumarThirty chilli (Capsicum annuum L.) RILs (recombinant inbred lines) families were originated from a cross between California Wonder (non-pungent) and LCA- 235 (pungent), screened for quality traits capsaicin, oleoresin, extractable colour and colour value. The analyses of variance revealed significant differences between the genotypes for all the quality traits analyzed. Significant variations were recorded for all the parameters in the tested RILs families. The capsaicin content ranged from 0.05 to 0.34%, whereas the oleoresin content ranged from 7.60 to 14.20%. Extractable colour (the standard measurement of colour in the spice industry) ranged from 54.94-324.48 ASTA (American Spice Trade Association). The colour value ranged from 23430 to 132330 c.u.PublicationArticle Some unusual high dispersion whistler triplets recorded at a low L-value (L=1.17)(Scientific Publishers, 2009) K.K. Singh; J. Singh; M. Altaf; A.K. Singh; Shyampati; P.A. Ganai; LalmaniA detailed analysis of the VLF data collected during January to December, 2003 at the low latitude station Jammu (geomag. lat., 22° 26′ N; L = 1.17) has yielded some unusual VLF events like whistler triplets of very high dispersion D ∼ 70 - 90 sec1/2. From the dispersion analysis of the whistler triplets, it is found that the individual whistlers of the triplets are one-hop high dispersion ducted whistlers having propagation path along higher and closely spaced L-values (L∼4.0) than the L-value of the recording station. The dispersion and occurrence characteristics of these high dispersion whistlers of the triplets are compared with those of the majority of low dispersion whistlers (D ∼ 30 - 40 sec1/2) recorded during the same period. Generation and propagation mechanisms are briefly discussed. © 2009 IACS.PublicationArticle Flavonoids of Zizyphus rugosa(Indian Chemical Society, 2009) A. Singh; M.B. Pandey; Sarita Singh; A.K. Singh; J.P. SinghThree flavonolds - kaempferol-4′-methylether, luteolin and luteolin-7-O-glucoside have been isolated from the barks of Zizyphus rugosa and their structures were established by spectral evidences. This is the first report of these flavonoids from Z. rugosa.PublicationArticle Electrical properties of Se93-x-Zn2-Te5-Inx chalcogenide glasses(S.C. Virtual Company of Phisics S.R.L, 2009) A.K. Singh; N. Mehta; K. SinghElectrical properties of Se93-xZn2Te5Inx (X= 0, 2, 4, 6 and10) chalcogenide glasses have been carried out at room temperature. I-V characteristic of the present glasses were recorded upto 200V. A drastic I-V characteristic change have been observed between 160 to 200V for 4, 6, 10 at % of indium glasses. The electrical conductivity, ln(I) vs V1/2 characteristics and electrical conductivity vs average coordination number parameter of present glasses have been also determined, which extensively varied with indium concentration.PublicationArticle Evaluation of integrated pest management modules against gram pod borer in chickpea (Cicer arietinum)(2009) A.K. Singh; C.P. Srivastava; Nitin JoshiField experiments were conducted during winter (rabi) 2003-04 and 2004-05 to evaluate the effectiveness of integrated pest management (IPM) modules against gram pod borer, [Helicoverpa armigera (Hüibner)], on chickpea (Cicer arietinum L.). Amongst the various modules evaluated for 2 years on 'BG 256' chickpea in Mirzapur district, Uttar Pradesh, module M 5 (sole crop of chickpea, pheromone traps @ 20/ha, bird perches @ 20/ha, endosulfan 35 EC @ 0.07% a.i. and chlorpyriphos @ 0.05% a.i.), followed by M 2 (sole crop of chickpea, pheromone traps @ 20/ha, bird perches @ 20/ ha, methomyl 40 SP @ 1.0 kg/ha of formulated insecticide and 2 sprays of HaNPV @ 400 LE/ha) were found effective in managing the population of H. armigera. On an average, the grain yields were higher in M 5 (1 382 kg/ha), followed by M 2 (1 196 kg/ha) in comparison to the other modules including farmers' practice. The highest cost : benefit (C : B) ratio was obtained in M 5 (1:5.09), followed by M 4 (1:2.2). Though, least population of natural enemies was recorded in M 5, the module proved superior to other modules in respect of managing pest population and C:B ratio and hence could be utilized by farmers.PublicationArticle Characteristics of discrete VLF falling-tone chorus emissions observed at low latitude ground station Jammu(Springer Berlin, 2009) Ashutosh K. Singh; R.P. Patel; R. Singh; K.K. Singh; A.K. SinghThe discrete VLF chorus emissions recorded at low latitude ground station Jammu (geomag. lat. = 22°26′N, L = 1.17) are reported and their characteristics based on spectral analysis have been carried out. These discrete chorus emissions are falling tone emissions which are rarely observed at low latitude ground stations. These discrete chorus emissions are generated during a strong geomagnetic storm period of 2-7 May, 1998. We have computed the frequency sweep rate, repetition period and source region of the individual chorus elements. It is observed that the sweep rate increases with time. Copyright © The Society of Geomagnetism and Earth.PublicationArticle New alkaloids from Corydalis species(2009) R.N. Jha; M.B. Pandey; A.K. Singh; S. Singh; V.P. SinghA new alkaloid, chaerophylline (1), together with known alkaloids (-)-corypalmine, berberine chloride, (-)-isocorypalmine, (-)-corydalmine and (+)-bicuculline have been isolated from the crude base fraction of Corydalis chaerophylla. The crude base fractions of Corydalis longipes gave a new alkaloid, longicine (4), together with known alkaloids (±)-α-hydrastine, (±)-β-hydrastine, N-methylhydrasteine hydroxylactam, 1-methoxyberberine chloride and berberinium hydroxide. These alkaloids are reported for the first time from the above species and their structures were established by chemical and spectroscopic evidence.PublicationArticle A study on carbohydrate moieties of gills and air-breathing organs of the walking catfish Clarias batrachus (Linn.) following exposure to arsenic(2009) A.K. Singh; T.K. BanerjeeThe chronic sublethal (1 ppm) effects of an arsenic (As) salt, disodium arsenate heptahydrate (DSA) was examined on the carbohydrate moieties of the gills and air-breathing organs (ABO) of the walking catfish Clarias batrachus Linn. The glycogen content increased quantitatively in the gills during initial stages followed by a decrease after 7 days and throughout treatment. The fall was significant after 30-45 days exposure. This was also accompanied by an increase followed by a decrease in mucogenic activity of the gills. Glycoproteins (GPs) along with the mucous cells stained strongly for carboxylic groups and O-sulfated esters. Unlike the gills, the air-breathing organs showed an increase in glycogen content that surpassed the level of untreated control fish after prolonged exposure. The data indicate that As disturbed aerial respiration after chronic exposure. Mucogenic activity in the air-breathing organs fell markedly and always remained below the level of untreated control fish. Similar to the gills, the air-breathing organs also showed a strong affinity for GPs containing carboxylic groups and O-sulfated esters. © 2009 Taylor & Francis.PublicationArticle Variability in the characteristics of ultradian and circadian rhythms in plasma levels of growth hormone in the Indian walking catfish, Clarias batrachus(2009) A.K. Singh; Bechan Lal; Atanu Kumar PatiThe plasma profile of growth hormone (GH) was monitored in the freshwater catfish, Clarias batrachus over a single 24-h transverse timescale in the middle of each month starting from March to August. This period included different physiological status of the fish and also varying environmental photoperiod and ambient temperature. Statistically significant ultradian rhythm in GH was detected in all the months of study. Of the two ultradian peaks, one was located invariably in the early photophase with the other one in the early scotophase. During the period of intense reproductive activity (June and July), circadian rhythm in GH was also recorded in addition to ultradian rhythm. The 24-h average (Mesor) and amplitude of ultradian rhythm of GH were high in March and April coinciding with the increase in photoperiod, temperature and feeding activity. Mesor increased further in May, reaching the maximum in June with a further rise in the water temperature and intense gonadal activity, but the amplitude declined during these months. In the breeding month of July, Mesor declined moderately and amplitude declined further. In August, Mesor and amplitude both attained minimum levels. In July and August one of the ultradian peaks overlapped with the circadian peak of the GH rhythm and the circadian peaks appeared in the night, while in other months it appeared in the early morning or at midday. Synchronization of one of the ultradian peaks with that of the circadian peak in GH in the night of July and August might provide physiological advantage for the execution of breeding at the coolest part of the day. The rhythmic patterns of GH secretion might have a strong correlation with the changing photoperiod, temperature, and feeding and reproductive activity. The observed temporal organization in GH in C. batrachus may have physiological consequences that might provide suitable milieu for the regulation of its somatic and gonadal growth, and execution of reproductive activity.PublicationArticle Electrical properties of Se-Zn-In chalcogenide glasses(2009) A.K. Singh; N. Mehta; K. SinghaElectrical measurements of Se98XZn2InX (X = 0, 2, 4, 6 and 10) chalcogenide glasses have been carried out at room temperature. I-V characteristic of the present glasses were recorded upto 200 V.A drastic changes in I-V characteristic have been observed between 180 to 200 V for 4, 6, 10 at% of indium. The composition dependence of electrical conductivity is also discussed. © EDP Sciences.