Browsing by Author "R. Tripathi"

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A new band system in the red region of CuBr
(1981) R. Tripathi; S.B. Rai; K.N. Upadhya
A new band system of CuBr involving two new electronic states has been observed in the spectral region 5900-6300 AA. This is the first observation of a transition involving two excited states in any diatomic copper halide. The transition appears to be Delta Lambda =0 type. The vibrational assignments of the bands have been confirmed by measuring the isotopes shifts. The vibrational constants for the two states for 63Cu79Br are omega e'=300.35 cm-1, omega e"=241.52 cm-1, omega e'xe'=0.42 cm-1, omega e"xe"=1.46 cm-1 and nu e=16267.55 cm-1. A partial rotational analysis of the (0,0) band has also been carried out.
Adsorption of phosphate ions on antimony tetroxide by radioactive tracer technique
(1973) I.S. Singh; V.N. Singh; R. Tripathi; B.M. Shukla
[No abstract available]
Analysis of a metal clad waveguide sensor having metamaterial as a guiding layer
(De Gruyter Open Ltd, 2016) A. Upadhyay; Y.K. Prajapati; R. Tripathi; V. Singh; J.P. Saini
In this study a metal clad waveguide sensor with a metamaterial guiding layer is analyzed. Sensitivity of the proposed sensor is derived using dispersion and Fresenal's equations for waveguiding mode and reflection mode. While efficiently analyzing and comparing the results with the existing one, some interesting findings are achieved. It is observed that the proposed sensor shows larger cover layer sensitivity and larger adlayer sensitivity compared to the dielectric guiding layer sensor due to adsorbtive properties of metamaterial. Henceforth, it concludes that the proposed sensor shows sensitivity improvement over a dielectric guiding layer sensor. © 2016 by Walter de Gruyter Berlin/Boston 2016.
Cutaneous T-cell lymphomas and their management strategies
(Wolters Kluwer Medknow Publications, 2014) S.S. Pandey; S. Garg; A.N.D. Dwivedi; R. Tripathi; K. Tripathi; M. Bansal
Cutaneous T-cell lymphomas (CTCLs) comprise a heterogeneous group of lymphoproliferative disorders characterized by the proliferation of skin-homing post-thymic T-cells. It is the second most common extranodal non-Hodgekin′s lymphoma. Many variants of mycosis fungoides and CTCLs are known to date, differing in clinical, histological, and immunophenotypic characteristics. Oral involvement has also been reported rarely in CTCLs. Treatment depends on the disease stage or the type of variant. New insights into the disease and the number of emerging novel therapeutic options have made it an interesting area for dermatologists and medical oncologists.
Detection of rifampicin resistance in tuberculosis by molecular methods: A report from Eastern Uttar Pradesh, India
(Wolters Kluwer Medknow Publications, 2016) R. Tripathi; P. Sinha; R. Kumari; P. Chaubey; A. Pandey; S. Anupurba
Diagnosis of drug resistance tuberculosis (TB) by the gold standard method is labour intensive and time consuming. Hence, there is an urgent need for introduction of rapid diagnostic techniques. Line probe assay (LPA) and cartridge-based nucleic acid amplification test (CBNAAT) have been introduced in India under Revised National Tuberculosis Control Program. Spot and morning sputum samples of previously treated patients by anti-TB drugs were subjected to LPA or CBNAAT. Total 682/1253 (54.4%) were diagnosed as rifampicin-resistant. The patients could be diagnosed early by molecular methods and put on second line treatment. © 2016 Indian Journal of Medical Microbiology Published by Wolters Kluwer - Medknow.
Effect of supplemental UV-B on yield, seed quality, oil content and fatty acid composition of Brassica campestris L. under natural field conditions
(Wageningen Academic Publishers, 2016) R. Tripathi; S.B. Agrawal
Thinning of stratospheric ozone layer had been reported since last fifty years due to emission of chlorofluorocarbons, resulting in an increase in ultraviolet-B (UV-B) radiation. The present study was conducted to examine the effects of supplemental UV-B (sUV-B) radiation (+7.2 kJ/m2/s) on yield and quality of seeds and oil of two cultivars of mustard, (Brassica campestris) L. cv. Sanjukta and Vardan. Number of pods, harvest index, test weight and oil content decreased due to sUV-B exposure in both cultivars. Seed quality was also reduced under sUV-B in terms of protein, sugar and amino acid contents. Further, quality of oil was deteriorated due to increases in erucic acid, polyunsaturated fatty acid and ω-6 fatty acid contents and reductions in oleic acid and nervonic acid contents due to sUV-B exposure. Cultivar Vardan showed more negative impact on seed yield due to UV-B stress, whereas quality of seed and oil was more affected in Sanjukta. Results of the present study confirmed the potential loss in yield as well as quality of seeds and oil of mustard under futuristic levels of increase in UV-B radiation. © 2015 Wageningen Academic Publishers.
Isotope exchange of iodine in iodide-iodate melts studied by radio paper chromatography
(Kluwer Academic Publishers, 1990) K.D. Ram; R. Tripathi
The isotopic exchange reaction of iodine in fused NaI-NaIO3 and KI-KIO3 systems, which does not proceed until the mixture is melted, is found to be almost instantaneous in homogeneous melts. The equilibrium is attained within a period of less than 5 min at a temperature 5°C above the melting temperature of each composition for both systems. No noticeable exchange is observed even after heating the samples for 30 min at a temperature 20°C below the corresponding melting point. A single-step bimolecular association-dissociation mechanism is proposed for the exchange. © 1990 Akadémiai Kiadó.
Local anesthetics. II. Synthesis of 2-(N,N-disubstituted aminoacetamido)-4-p-fluorophenyl and -m-methoxyphenyl thiazoles
(1982) P.N. Bhargava; R. Lakhan; R. Tripathi
[No abstract available]
Metal clad waveguide sensor with metamaterial layer for refractometric sensing application
(American Scientific Publishers, 2015) Anurag Upadhyay; Y.K. Prajapati; R. Tripathi; Vivek Singh; J.P. Saini
In present communication, a four layer metal clad waveguide sensor having metamaterial as a film layer is studied, with and without adlayer. Sensitivity of proposed sensor is analyzed in reflection mode using Fresenal's relation. The obtained results are compared with the result of a metal clad waveguide sensor having dielectric as film layer in order to see the effect of unnatural properties of metamaterial in sensing application. Proposed sensor shows sharper reflectance peaks and measurable shift in peak position due to change in cover layer refractive indices for larger range of cover layer refractive indices values. Hence, proposed sensor is better for refractometry application. Copyright © 2015 American Scientific Publishers.
Rotational analysis of the B-X system of antimony monoxide molecule
(1982) R. Tripathi; K.N. Upadhya; R.B. Singh; S.B. Rai
The rotational structure in the 2 Sigma +- 2 Pi 3/2 subsystem and the B-X system of the SbO molecule, photographed earlier under high resolution, has been reanalysed. It is concluded that all earlier reported rotational analyses are incorrect and the B2 Sigma + state has an appreciable spin splitting. New molecular constants for the two combining states are presented.
Study of Solid State Exchange of 131I-Doped in KIO by Radio Paper Chromatography
(1992) R. Tripathi; Kapil D. Ram
The chemical change of 1311-dopants are studied in KI03 using radio paper chromatography. Isothermal and isochronal transfer annealing reveal that the conversion of 1311-into 131IO3is initially sharp, leading to a temperature-dependent pseudo-plateau, and follows a first-order kinetics with an activation energy of 0.35 eV. The decrease in the total radioactivity of the doped samples upon heating in tubes open to atmosphere signifies the formation of a volatile intermediate, i.e., iodine. The importance of iodine vapour in the transfer annealing process is manifested by the higher yield of131IO-3when the doped samples are heated in sealed tubes. The yield of 131IO-3is found to be higher when the doped samples after heat treatment were dissolved in alkaline aqueous media than after dissolution in acidic aqueous media. The mechanism envisages, first, the formation of solid state lattice precursors induced by heat and inherent crystal defects. Later, these lattice precursors undergo either combination reactions to produce volatile iodine or exchange reactions with other isotopic species of the host lattice or hydrolytic/oxidation reactions upon dissolution in aqueous media. The roles of iodine vapour and effect of pH have been discussed. © 1992, R. Oldenbourg Verlag
Supplemental ultraviolet-B and ozone: Impact on antioxidants, proteome and genome of linseed (Linum usitatissimum L. cv. Padmini)
(2011) R. Tripathi; A. Sarkar; S. Pandey Rai; S.B. Agrawal
The present investigation used Linum usitatissimum L. cv. Padmini (linseed), under field conditions in open-top chambers, to evaluate the interactive effects of supplemental ultraviolet-B (sUV-B; ambient +7.2 kJ.m-2.d-1) and ozone (O3; ambient +10 ppb). Treatment of plants with sUV-B and O3, individually or in combination, caused several changes in enzymatic and non-enzymatic components of the antioxidant defence system. Photo-oxidative damage caused by sUV-B and O3, included lipid peroxidation, changed protein profiles and caused DNA strand breakage. One-dimensional gel electrophoresis revealed that proteins of 222.24 and 50.5 kDa are specific and appear after sUV-B and O3 exposure, and could be used as indicator proteins. Effects of sUV-B and O3 given separately are more detrimental as compared to combined treatment. Mutational and structural alterations in linseed DNA after these stresses were also examined using RAPD with ten different primers. The study concluded that both stresses, i.e. sUV-B and O3, are phytotoxic, causing significant changes in metabolites, antioxidants, the leaf proteome and the genome of linseed, but their interactive effect was always less than additive. © 2010 German Botanical Society and The Royal Botanical Society of the Netherlands.
The A-X and the B-X systems of the CuBr molecule
(1981) G.P. Mishra; R. Tripathi; S.B. Rai; K.N. Upadhya; D.K. Rai
[No abstract available]
The A-X system of the SbO+ molecule
(1981) R. Tripathi; S.B. Rai; K.N. Upadhya
The spectrum of the SbO+ molecule has been studied under high resolution for the first time. Analysis of the rotational structure in (1,2) and (1,3) bands leads to the following rotational constants: B'1=0.325 13 cm-1, D'1=2.09*10-7 cm1; B"2=0.359 64 cm-1, B"3=0.357 41 cm-1, B"e=0.365 13 cm-1, a"e=0.002 23 cm-1, D"2=1. 57*10-7 cm-1, D"3=1.47*10 -7 cm-1, r"e=1.8074 AA; nu (1,2)=23 568.12 cm-1, nu (1,3)=22657.79 cm -1.
The B-A system of CP molecule
(Springer India, 1981) R. Tripathi; S.B. Rai; K.N. Upadhya
The B-A system of CP molecule has been reinvestigated. The rotational structures in the (0, 0) and (1, 1) bands have been photographed in the second order of a 10.6 m grating with 25 μ slit width. The molecular constants have been determined using a weighted least squares fit computer program. It is found that the spin-splitting constant in the B-state is negative and not positive as reported by previous workers. An accurate value of α in the A-state could be determined. The present analysis also suggests that the spin-splitting constant in the ground state of CP should be positive, hence the assignment of the R 1 and R 2 or P 1 and P 2 branches in the B-X system of CP by Barwald et al should be interchanged. © 1981 Indian Academy of Sciences.
The isotope exchange reaction between iodide and iodate ions studied by chromatography
(1962) H.J. Arnikar; R. Tripathi
It is shown that paper chromatography can conveniently be employed for studying the high temperature isotope exchange reaction between iodide and iodate ions. By means of this method the reaction velocity and period of half-exchange were calculated for the reaction at 240° for three different equilibrium concentrations of the reactants. The data indicate the existence of an initial induction period, which is probably associated with the formation of traces of iodine and free acid, the iodide-iodate isotope exchange being considered as non-existent when the pure reactants are present in a neutral medium. © 1962.
Tracer diffusion of131I- ions in a few 1-2 electrolytes in agar gel
(Kluwer Academic Publishers, 1985) Miss; S. Baluja; R.N. Singh; R. Tripathi; B.M. Shukla
Tracer diffusion of131I- ions is studied at different temperatures /20°C-50°C/ in 2.5% agar gel containing sodium and potassium sulphate solutions over a wide range of concentrations. The results are in qualitative agreement with the theoretical values in the concentration range 10-6-10-1M. Agar gel shows an obstruction effect to diffusional flow. The activation energy for tracer diffusion was found to be of the order of 16.3 kJ mol-1. © 1985 Akadémiai Kiadó.