Browsing by Issue Date, starting with "1982"

Now showing 1 - 20 of 301

Silver jubilee symposium of the international society for tropical ecology, held at Maulana Azad College of Technology, Bhopal, M.P., India, during 5-10 October 1981
(1982) K.C. Misra
[No abstract available]
Investigation of lymphocyte subpopulations and hypersensitivity skin tests during the menstrual cycle and pregnancy
(1982) S. Agarwal; H.S. Shukla; M. Verma; S.C. Gupta; K. Mukherjee
Cell-mediated immune responses were examined during the menstrual cycle of 10 healthy females and in 90 pregnant females, 10 for each month of gestation, and in 10 females 2-4 weeks after normal delivery. Lymphocytes and their subpopulations and PPD hypersensitivity skin tests were investigated. The lymphocyte subpopulation T-cells showed statistically significant depression at the time of ovulation (P < 0.01) and during the entire period of gestation (P < 0.001) with recovery in the post-partum period. There was borderline PPD skin response during pregnancy which became positive after parturition. These changes were demonstrated to be specific to conception but the exact mechanism of the T-cell depression is not known. There was a corresponding rise in the B-cell count.
Effect of restraint stress on anticonvulsant actions of phenobarbitone & diphenylhydantoin in rats
(1982) S.K. Bhattacharya; D. Bhattacharya
Restraint stress (1, 2 and 4 hr) produced a time-related potentiation of the anticonvulsant activity of sub-anticonvulsant (ED0) dose (2.5 mg/kg, ip) of phenobarbitone (PB) and diphenylhydantoin (DPH), against maximal electroshock-induced seizures in rats. Restraint stress (4 hr)-induced potentiation of PB and DPH anticonvulsant actions were significantly attenuated after pharmacological treatments known to inhibit central serotonergic and prostaglandin (PG) activity, but were unaffected by drug-induced inhibition of endogenous corticoid synthesis. The results suggest the involvement of serotonin and PGs, but not endogenous corticoids, in restraint stress effects on PB and DPH actions.
Differential sensitivity of muntjac lymphocyte chromosomes to mitomycin C, bromodeoxyuridine and hydroxylamine at different cell-cylce stages
(1982) Pramila Gupta; T. Sharma
Quantitative and qualitative analyses were made of aberrations induced by 3 hitherto well-known mutagens, mitomycin C (MC), 5-bromodeoxyuridine (BUdR and hydroxylamine hydrocholride (HA), in muntjac chromosomes, during different stages of the cell cycle. The sensitivity ro MC was increased in G1, reached its maximum in early S and was considerably decreased in late S and G2 stage treated cells. BUdR induced maximal aberrations when given during the synthetic phase and the cells in G1 and G2 were least affected. The sensitivity of the cells to HA in terms of induced chromosomal aberrations increased as they moved through the cell cycle, i.e. more damage was observed in cells treated in late S and G2 stages than in those treated at G1 and early S stages. While there were defined patterns of cell-cylce stage-dependent sensitivity for all 3 chemicals, the chromosomal sites being preferentially affected by each were found to be specific and invariant at different stages. Thus, it is presumed that the functional state of such "preferred sites" at one or other stage of the cell cycle is the factor responsible for the stage-dependent sensitivity of a cell towards these chemicals. © 1982.
Taxonomic study of rapid lactose fermenting Vibrio species
(1982) S.C. Parija; R.K. Agarwal; S.C. Sanyal
[No abstract available]
Integral equation theory for the equilibrium properties of the semiclassical fluid with hard-core potential
(1982) Y.S. Sainger; S.K. Sinha; Y. Singh
Quantum corrections to the radial distribution function (RDF) and thermodynamic properties for semiclassical fluids whose molecules interact via pair potentials which are nonanalytic functions of the intermolecular separation are calculated by means of statistical mechanical perturbation theory using the extended Percus-Yevick (PY) and hypernetted-chain (HNC) theories. Expressions are obtained in terms of effective two-body potential which includes quantum mechanical corrections. One attractive feature of this method is that the higher order quantum corrections, in principle, are as easily calculated as the first order term. Numerical results are given for the first- and second-order corrections to the free energy and to the pressure, and for the first-order correction to the RDF. Significant features are the large increase in quantum corrections with increasing density, and the qualitative difference that quantum mechanics makes to the RDF near the hard core. © 1983 American Institute of Physics.
Structural information on the coordination compounds formed by manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) thiocyanates with 4-cyanopyridine N-oxide from their magnetic moments, electronic and infrared spectra
(1982) I.S. Ahuja; C.L. Yadava; Raghuvir Singh
Coordination compounds formed by the interaction of 4-cyanopyridine. N-oxide (4-CPO), a potentially bidentate ligand, with manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and rnercury(II) thiocyanates have been prepared and characterized from their elemental analyses, magnetic susceptibilities, electronic and infrared spectral studies down to 200 cm-1 in the solid state. The compounds isolated are: Mn(4-CPO)2(NCS)2, Co(4-CPO)2(NCS)2,Ni(4-CPO)2(NCS)2,Zn(4-CPO)2(NCS)2, Cd(4-CPO)(NCS)2 and Hg(4-CPO)2(SCN)2. It is shown that 4-CPO acts as a terminal N-oxide oxygen bonded monodentate ligand in all the metal(II) thiocyanate complexes studied. Tentative stereochemistries of the complexes in the solid state are discussed. The ligand field parameters 10 Dq, B, β and λ calculated for the manganese(II), cobalt(II) and nickel(II) complexes are consistent with their proposed stereochemistries. © 1982.
AMINO ACID NUTRITION IN THE BLUE‐GREEN ALGA NOSTOC MUSCORUM
(1982) A. VAISHAMPAYAN
The L‐isomers of 21 amino acids have been screened for their ability to serve as carbon or nitrogen sources for growth of the het+ nif−11 heterocystous and non‐nitrogen fixing mutant strain of the blue‐green alga Nostoc muscorum by a simple test system combining the use of 3‐(3,4‐dichlorophenyl)‐1,1‐dimethylurea (DCMU) (an inhibitor of photosynthetic assimilation of CO2) and the auxotrophic (non‐nitrogen fixing) characteristic of the mutant. The amino acids glutamate, alanine, tyrosine and cysteine were toxic; glutamine, histidine, asparagine, tryptophan and serine were utilized as nitrogen sources; arginine, proline and phenylalanine were utilized as carbon sources; leucine, isoleucine, lysine, methionine, valine and citrulline were utilized as sources of both carbon and nitrogen; aspartate, threonine and glycine served neither as carbon nor nitrogen sources. Copyright © 1982, Wiley Blackwell. All rights reserved
Studies in the mineral nutrition of Japanese mint - I. Influence of potassium deficiency on phosphorus metabolism, respiration, foliage growth and essential oil content
(Martinus Nijhoff/Dr. W. Junk Publishers, 1982) N.C. Sinha; J.N. Singh
Potassium deficiency resulted in a increased accumulation of total phosphorus, inorganic phosphorus and sugar phosphate which suggested some interference in phosphorus metabolism predominantly beyond the sugar phosphate synthesis stage. Roots appeared to be a reservoir for accumulation of various phosphorus fractions of Japanese mint (Mentha arvensis L. var. piperascens). A higher respiration rate under potassium deficiency might be one of the factors to retard the inclusion of inorganic phosphorus into structural components, resulting in poor formation of organophosphorus compounds needed for plant growth and development. In spite of an increased essential oil content (ml/100 g dry weight) in a phosphorus deficient situation, total essential oil production (ml/plant) was low. Foliage growth, essential oil content and respiration was higher between 60 to 80 days and seemed to be associated with a high intensity of enzymatic and metabolic activity, as observed in various phosphorus fractions rising to a very high value after 80 days of crop growth. © 1982 Martinus Nijhoff/Dr W. Junk Publishers.
Economic planning in India: Failure or success?
(1982) P.K. Bhargava; o̊Reader in Economics
The author traces the progress of economic planning in India to the point where it stands today, and makes a broad appraisal of the achievements in order to plan more systematically for the future. He recommends that there should be a secretariat attached to the National Development Council representing State governments to ensure that plans at State level are more realistic than they have been in the past, and that this process should be continued through other levels of government. © 1982.
A rule of deaspiration in colloquial Hindi
(Kluwer Academic Publishers, 1982) B.P. Gupta
[No abstract available]
Short communication: Neutral Four-coordinate Tetrahedral Manganese(H) Species Involving Coordinated Chloro- and Thiocyanato-Groups
(1982) I.S. Ahuja; Raghuvir Singh; C.L. Yadava
[No abstract available]
Diffusion kinetics and some aspects of solidification under microgravity environment
(Springer India, 1982) P. Ramachandrarao
The paper surveys the available literature on the direct influence of microgravity on diffusion in liquid metals, rate of solidification, growth of dendrites, undercooling of liquid metals and alloys and monotectic solidification. Agreement between theoretical predictions and experimental observations is discussed critically and areas requiring further study are highlighted. © 1982 The Indian Academy of Sciences.
Retinal changes in chick embryos induced by excess zinc
(1982) S. Singh; S. Shamal
[No abstract available]
On the possibilities of premonitory swarms for three sequences of earthquakes of the Burma-Szechwan region
(1982) V.P. Singh; H.N. Singh; J. Singh
Short term spatial and temporal variations in seismicity prior to the three sequences of earthquakes of mb ≥ 5.8 of the Burma-Szechwan region are studied. Six years (1971-1976) of ISC seismicity data, as reported in the Regional Catalogue of Earthquakes, are considered. During the period, six earthquakes of body wave magnitude mb ≥ 5.8 occurred in four sequences. Of these, three sequences are preceded by swarm activity in the epicentral regions. Evison (1977b) suggested that the swarm before the sequences of large shocks is a possible long-term precursor. He derived the conclusion by analyzing earthquakes in New Zealand and California. The analysis of the seismicity data for the region under investigation supports Evison's view and suggests that a relation between swarms and sequences of large events exists. The precursory time period (i.e. the time from beginning of the swarm to the main shock) for the Szechwan earthquakes of mb = 5.9 (Feb. 6, 1973) and mb = 5.8 (May 10, 1974) and the Burma earthquake of mb = 6.2 (Aug. 12, 1976) are 305, 317 and 440 days, respectively. © 1982.
Effect of brain monoamines on the secretion of adrenocorticotrophic hormone
(1982) A. Amar; S. Mandal; A.K. Sanyal
The role of brain monoamines (5-HT, NA and DA) in the secretion of adrenocorticotrophic hormone (ACTH) was studied in view of contradictory reports. Plasma corticosterone levels and the rate of synthesis of corticosterone in vitro by the adrenal gland were estimated in albino rats and have been taken as the index of ACTH activity. These estimations were done in unstressed and stressed, and in untreated and treated rats. Drugs were administered intracerebroventricularly to the rats to cause selective degeneration of tryptaminergic, noradrenergic or dopaminergic neurons. The results show that plasma corticosterone levels and the rate of synthesis of corticosterone were significantly decreased after selective degeneration of tryptaminergic neurons in unstressed rats. After selective degeneration of either tryptaminergic or noradrenergic neurons, the acute increase in the plasma corticosterone levels and rate of synthesis of corticosterone in vitro by adrenal glands in stressed rats were significantly inhibited. These results have been interpreted to suggest that the central tonic control on adrenal glands may be 5-HT mediated and that during stress ACTH secretion may be both 5-HT and NA mediated. DA does not seem to have significant role in the regulation of ACTH secretion.
The antennae and mating behaviour of Drosophila females
(Birkhäuser-Verlag, 1982) B.N. Singh; O.P. Singh; J.P. Gupta
The females of Drosophila bipectinata and D. malerkotliana are able to discriminate between their own and alien males in the absence of antennae. Thus mate recognition seems to depend on contact chemoreceptors in these 2 species. © 1982 Birkhäuser Verlag.
Comments on "perturbation theory of quantum fluids at high temperature"
(1982) S.K. Sinha; Y. Singh
[No abstract available]
On the Mechanism of F.C.C. → H.C.P. Transformation
(1982) J. Singh; S. Ranganathan
Electron microscopic studies of thermally induced f.c.c. to h.c.p. transformation in Co–5% Fe alloys are interpreted in favour of the fault agglomeration model. Little or no evidence is found for the role of grain boundaries in this transformation. An earlier model based on grain boundary dislocations is shown to suffer from severe crystallographic limitations. Copyright © 1982 WILEY‐VCH Verlag GmbH & Co. KGaA
Dimerization of 3-Benzoyl-4-phenylisocrotonic Acid
(1982) Janak Singh; Kanti P. Agarwal; Gurbakhsh Singh
The acid-catalyzed self-condensation of acid 1a formed the tricyclic pseudoacid dichloride 3a, which on pyrolysis underwent a ring-expansion rearrangement to produce the dilactone 5a. The structures and stereochemistries of these dimeric compounds are deduced by a study of their chemical transformations involving extensive use of deuterium incorporation. © 1982, American Chemical Society. All rights reserved.