Browsing by Author "P. Singh"

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2.45GHz (CW) Microwave irradiation alters circadian organization, spatial memory, DNA structure in the brain cells and blood cell counts of male mice, mus musculus
(Electromagnetics Academy, 2011) Chandra Mohini Chaturvedi; V.P. Singh; P. Singh; P. Basu; M. Singaravel; R.K. Shukla; A. Dhawan; A.K. Pati; R.K. Gangwar; S.P. Singh
Present study examines biological effects of 2.45 GHz microwave radiation in Parkes strain mice. Forty-day-old mice were exposed to CW (continuous wave) microwave radiation (2 h/day for 30 days). Locomotor activity was recorded on running wheel for 12 days prior to microwave exposure (pre-exposure), 7 days during the first week of exposure (short-term exposure) and another 7-day spell during the last week of the 30-day exposure period (long-term exposure). Morris water maze test was performed from 17th to 22nd day of exposure. At the termination of the exposure, blood was processed for hematological parameters, brain for comet assay, epididymis for sperm count and motility and serum for SGOT (serum glutamate oxaloacetate transaminase) and SGPT (serum glutamate pyruvate transaminase). The results show that long-term radiation-exposed group exhibited a positive ψ (phase angle difference) for the onset of activity with reference to lights-off timing and most of the activity occurred within the light fraction of the LD (light: dark) cycle. Microwave radiation caused an increase in erythrocyte and leukocyte counts, a significant DNA strand break in brain cells and the loss of spatial memory in mice. This report for the first time provides experimental evidence that continuous exposure to low intensity microwave radiation may have an adverse effect on the brain function by altering circadian system and rate of DNA damage.
Ab initio determination of molecular geometries and vibrational frequencies of CX3 COOH (X = H, F, Cl, Br)
(2008) R.A. Yadav; M. Kumar; R. Singh; P. Singh; S. Jaiswal; G. Srivastav; R.L. Prasad
Using Gaussian 03 Revision C.02 version of the quantum chemical program ab initio and DFT computations have been carried out at the rhf/6-31+g*, b3lyp/6-31+g*, b3lyp/6-31++g** and b3lyp/6-311++g** levels to compute optimized geometries, harmonic vibrational frequencies along with intensities in IR and Raman spectra and atomic charges for the acetic (ethanoic) acid and its 1,1,1-tri-halo (fluoro, chloro and bromo) derivatives. The optimized molecular structures for all the four molecules are found to possess Cs point group symmetry. The symmetric stretching mode is found to have lowest magnitude of the three CX3 stretching modes for all the four molecules, whereas the symmetric deformation mode is found to have the lowest magnitude for EA and TFEA and the highest magnitude for TCEA and TBEA. The parallel rocking mode of the CX3 group is found to have lower magnitude than the perpendicular rocking mode for EA and TFEA where reverse is found for TCEA and TBEA. The modes of the COOH group are substituent sensitive except the OH stretching mode. Moreover, the maximum effect is found for the TFEA molecule. The CF3 group is found to have the characteristic frequencies as 235-505, 787, 1150-1190 and 1400 cm-1 which are due to the modes δs(CF3), νs(CF3), νas(CF3) and ν(C-CF3), respectively. © 2008 Elsevier B.V. All rights reserved.
Ab initio studies of molecular structures, conformers and vibrational spectra of heterocyclic organics: I. Nicotinamide and its N-oxide
(2010) M. Kumar; S. Jaiswal; R. Singh; G. Srivastav; P. Singh; T.N. Yadav; R.A. Yadav
FTIR spectra of nicotinamide and its N-oxide have been recorded and analyzed in the range 400-4000 cm-1. The stabilities, optimized molecular geometries, APT charges and vibrational characteristics for the two possible conformers of nicotinamide and its N-oxide have been studied theoretically using restricted Hartree-Fock (RHF) and density functional theory (DFT) methods. The E (trans) conformers of nicotinamide and its N-oxide are found to be more stable and less polar than their respective Z (cis) conformers. Due to addition of an O atom at the N1 site in the NA molecule the magnitudes of atomic charges on all the H atomic sites are found to increase. For all the studied molecules, magnitude of the wagging mode of the NH2 group is found to be higher than its torsion mode, which is in the reverse order as compared to that for the aniline molecule. Most of the vibrational frequencies have nearly the same magnitude for the two conformers of nicotinamide and its N-oxide, however, significant changes are noticed in their IR intensities, Raman activities and depolarization ratios of the Raman bands. The frequency of the ring breathing mode for the NA molecule is found to decrease by 100 cm-1 in going to the NANO molecule for both the conformers. The IR intensity for the scissoring mode of the CON(H2) group is found to decrease significantly for the NA-II conformer as compared to that for the NA-I conformer. © 2009 Elsevier B.V. All rights reserved.
Abelian Theorems for the Wavelet Transform in Terms of the Fractional Hankel Transform
(Pleiades Publishing, 2024) A. Dey; K. Mahato; P. Singh
Abstract: This paper deals with the study of initial and final value theorems by means of fractional Hankel wavelet transform function and afterwards tempered distributions. © Pleiades Publishing, Ltd. 2024.
Adjusting neutrino interaction models and evaluating uncertainties using NOvA near detector data
(Springer Science and Business Media Deutschland GmbH, 2020) M.A. Acero; P. Adamson; G. Agam; L. Aliaga; T. Alion; V. Allakhverdian; N. Anfimov; A. Antoshkin; L. Asquith; A. Aurisano; A. Back; C. Backhouse; M. Baird; N. Balashov; P. Baldi; B.A. Bambah; S. Bashar; K. Bays; S. Bending; R. Bernstein; V. Bhatnagar; B. Bhuyan; J. Bian; J. Blair; A.C. Booth; P. Bour; R. Bowles; C. Bromberg; N. Buchanan; A. Butkevich; S. Calvez; T.J. Carroll; E. Catano-Mur; S. Childress; B.C. Choudhary; T.E. Coan; M. Colo; L. Corwin; L. Cremonesi; G.S. Davies; P.F. Derwent; P. Ding; Z. Djurcic; D. Doyle; E.C. Dukes; P. Dung; H. Duyang; S. Edayath; R. Ehrlich; M. Elkins; G.J. Feldman; P. Filip; W. Flanagan; J. Franc; M.J. Frank; H.R. Gallagher; R. Gandrajula; F. Gao; S. Germani; A. Giri; R.A. Gomes; M.C. Goodman; V. Grichine; M. Groh; R. Group; B. Guo; A. Habig; F. Hakl; J. Hartnell; R. Hatcher; A. Hatzikoutelis; K. Heller; J. Hewes; A. Himmel; A. Holin; B. Howard; J. Huang; J. Hylen; F. Jediny; C. Johnson; M. Judah; I. Kakorin; D. Kalra; D.M. Kaplan; R. Keloth; O. Klimov; L.W. Koerner; L. Kolupaeva; S. Kotelnikov; Ch. Kullenberg; A. Kumar; C.D. Kuruppu; V. Kus; T. Lackey; K. Lang; L. Li; S. Lin; M. Lokajicek; S. Luchuk; K. Maan; S. Magill; W.A. Mann; M.L. Marshak; M. Martinez-Casales; V. Matveev; B. Mayes; D.P. Méndez; M.D. Messier; H. Meyer; T. Miao; W.H. Miller; S.R. Mishra; A. Mislivec; R. Mohanta; A. Moren; A. Morozova; L. Mualem; M. Muether; S. Mufson; K. Mulder; R. Murphy; J. Musser; D. Naples; N. Nayak; J.K. Nelson; R. Nichol; G. Nikseresht; E. Niner; A. Norman; A. Norrick; T. Nosek; A. Olshevskiy; T. Olson; J. Paley; R.B. Patterson; G. Pawloski; O. Petrova; R. Petti; R.K. Plunkett; A. Rafique; F. Psihas; A. Radovic; V. Raj; B. Ramson; B. Rebel; P. Rojas; V. Ryabov; O. Samoylov; M.C. Sanchez; S. Sánchez Falero; I.S. Seong; P. Shanahan; A. Sheshukov; P. Singh; V. Singh; E. Smith; J. Smolik; P. Snopok; N. Solomey; A. Sousa; K. Soustruznik; M. Strait; L. Suter; A. Sutton; C. Sweeney; R.L. Talaga; B. Tapia Oregui; P. Tas; R.B. Thayyullathil; J. Thomas; E. Tiras; D. Torbunov; J. Tripathi; Y. Torun; J. Urheim; P. Vahle; Z. Vallari; J. Vasel; P. Vokac; T. Vrba; M. Wallbank; T.K. Warburton; M. Wetstein; D. Whittington; S.G. Wojcicki; J. Wolcott; A. Yallappa Dombara; K. Yonehara; S. Yu; Y. Yu; S. Zadorozhnyy; J. Zalesak; Y. Zhang; R. Zwaska
The two-detector design of the NOvA neutrino oscillation experiment, in which two functionally identical detectors are exposed to an intense neutrino beam, aids in canceling leading order effects of cross-section uncertainties. However, limited knowledge of neutrino interaction cross sections still gives rise to some of the largest systematic uncertainties in current oscillation measurements. We show contemporary models of neutrino interactions to be discrepant with data from NOvA, consistent with discrepancies seen in other experiments. Adjustments to neutrino interaction models in GENIE are presented, creating an effective model that improves agreement with our data. We also describe systematic uncertainties on these models, including uncertainties on multi-nucleon interactions from a newly developed procedure using NOvA near detector data. © 2020, The Author(s).
Antimicrobial assay and genetic screening of selected freshwater Cyanobacteria and identification of a biomolecule dihydro-2H-pyran-2-one derivative
(2017) A. Srivastava; V.K. Singh; S. Patnaik; J. Tripathi; P. Singh; G. Nath; R.K. Asthana
Aims: Explorations of freshwater Cyanobacteria as antimicrobial (bacteria, fungi and methicillin-resistant Staphylococcus aureus (MRSA) strains) drug resource using bioassay, NRPS (non-ribosomal polypeptide synthetase) and PKS (polyketide synthase) genes, as well as in silico approach. Methods and Results: We have bioassayed the extracts of Phormidium CCC727, Geitlerinema CCC728, Arthrospira CCC729, Leptolyngbya CCC732, Phormidium CCC730, Phormidium CCC731 against six pathogenic bacteria comprising Gram (+ve): S. aureus including seven clinical MRSA and Enterococcus faecalis, Gram (−ve): Escherichia coli, Salmonella Typhimurium, Klebsiella pneumoniae and Shigella boydii along with non-pathogenic Enterobacter aerogenes as well as fungal strains (Cryptococcus neoformans and Candida albicans, C. krusei, C. tropicalis and Aspergillus niger) exhibiting antimicrobial potential. The NRPS and PKS genes of the target strains were also amplified and sequenced. The putative protein structures were predicted using bioinformatics approach. Conclusion: PKS gene expression indicated β keto-acyl synthase as one of the important active domains in the biomolecules related to antitumour and antifungal group. The simultaneous identification of the biomolecule (dihydro-2H-pyran-2-one derivative) was also inferred spectroscopically. Significance and Impact of the Study: Freshwater Cyanobacteria are prolific producers of secondary metabolite(s) that may act as the antimicrobial drug resource in addition to their much explored marine counterpart. © 2016 The Society for Applied Microbiology
Arsenic removal from synthetic waste water by CuO nano-flakes synthesized by aqueous precipitation method
(Desalination Publications, 2017) D.B. Pal; D.D. Giri; P. Singh; S. Pal; P.K. Mishra
Arsenic contamination in the drinking water is a serious issue affecting health of inhabitants of developing countries like India and Bangladesh and needs cost effective solutions. The nanomaterials having large surface area per unit volume could be useful adsorbent for water arsenic decontamination. The CuO nanomaterial synthesized by aqueous precipitation method. The obtained nanomaterial suspension sonicated for 15 min before centrifugation at 5,000 g for 10 min. Thoroughly washed and overnight dried pellets at 60°C characterized by scanning electron microscope revealed nanoflakes structure of the pellets. The copper nanoflakes (CONF) have monoclinic CuO structure in XRD analysis. The kinetics of arsenic adsorption determined by varying arsenic content and dose of adsorbent for a period of 1 h revealed second order adsorption kinetics. The synthesized nano-flakes have potential application for arsenic removal from water well below safe limit. © 2017 Desalination Publications. All rights reserved.
Cognitive functions in patients of primary affective disorder on prophylactic lithium treatment
(1988) I. Sharma; P. Singh
[No abstract available]
Colour tunability in a bimodal fluorescent hybrid nanostructure UCNPs@AuNPs@QDs
(Elsevier B.V., 2020) Priyam Singh; P. Singh; R. Prakash; S.B. Rai; S.K. Singh
In the present work, lysine modified NaY0.78Er0.02Yb0.2F4 upconversion nanoparticles (UCNPs, positively charged) and lysine modified ZnSe:Mn2+ quantum dots (QDs, positively charged) are attached onto the surface of citrate reduced gold nanoparticles (AuNPs, negatively charged). The gold nanoparticles not only entangle the QDs and the UCNPs, through electrostatic interaction, but also tune the optical properties of UCNPs through the effect of surface plasmon resonance. The hybrid nanostructure gives green emission both through photoluminescence (under UV excitation) and through photon upconversion (under IR light excitation) process. The colour tuning is observed through variation in the size of QDs and through plasmonic effect of gold nanoparticles. In both the cases, the colour of emission gradually changes from green to red. The colour tunability and bi-modal photon conversion property of this material could be useful for its application in the field of bio-imaging and solar energy harvesting. © 2020 Korean Physical Society
Comparative structural and vibrational studies of 6-amino purine (Guanine) and its radical species using density functional theory
(2011) Rashmi Singh; M. Kumar; P. Singh; R.A. Yadav
Guanine (G) is one of the most important nucleic acid bases (NAB) occurring in both DNA and RNA. In addition to being the largest NAB, it has also the most complex tautomeric equilibria. It is very important to understand the properties of the guanine base of DNA as thoroughly as possible since it is the most frequently involved site in the processes of mutation and cancer. The equilibrium geometries, APT charges, fundamental vibrational frequencies along with their corresponding intensities in IR spectrum, Raman activities and depolarization ratios of the Raman bands for the neutral and its radical species (G, G +, G -) of the guanine molecule were computed by density functional B3LYP method with 6-311++G (d, p) basis sets using Gaussian- 03 software. The thermodynamic functions of the title compounds were also performed at the same basis sets. The calculations predicted the G molecule as well as the radical anionic species of G to possess planar structures with C1 point group symmetry whereas the radical cationic species of G possesses Cs point group symmetry. The properties of the radical cations that are generated from the neutral neleobase molecules during the certain processes helps in understanding the nuclei acids in different environments and conditions. The radical anions are intermediates in a numbers of chemical reactions. Therefore data of their structures are useful for studying the mechanism and kinetics.
Constraints on Oscillation Parameters from νe Appearance and νμ Disappearance in NOvA
(American Physical Society, 2017) P. Adamson; L. Aliaga; D. Ambrose; N. Anfimov; A. Antoshkin; E. Arrieta-Diaz; K. Augsten; A. Aurisano; C. Backhouse; M. Baird; B.A. Bambah; K. Bays; B. Behera; S. Bending; R. Bernstein; V. Bhatnagar; B. Bhuyan; J. Bian; T. Blackburn; A. Bolshakova; C. Bromberg; J. Brown; G. Brunetti; N. Buchanan; A. Butkevich; V. Bychkov; M. Campbell; E. Catano-Mur; S. Childress; B.C. Choudhary; B. Chowdhury; T.E. Coan; J.A.B. Coelho; M. Colo; J. Cooper; L. Corwin; L. Cremonesi; D. Cronin-Hennessy; G.S. Davies; J.P. Davies; P.F. Derwent; R. Dharmapalan; P. Ding; Z. Djurcic; E.C. Dukes; H. Duyang; S. Edayath; R. Ehrlich; G.J. Feldman; M.J. Frank; M. Gabrielyan; H.R. Gallagher; S. Germani; T. Ghosh; A. Giri; R.A. Gomes; M.C. Goodman; V. Grichine; R. Group; D. Grover; B. Guo; A. Habig; J. Hartnell; R. Hatcher; A. Hatzikoutelis; K. Heller; A. Himmel; A. Holin; J. Hylen; F. Jediny; M. Judah; G.K. Kafka; D. Kalra; S.M.S. Kasahara; S. Kasetti; R. Keloth; L. Kolupaeva; S. Kotelnikov; I. Kourbanis; A. Kreymer; A. Kumar; S. Kurbanov; K. Lang; W.M. Lee; S. Lin; J. Liu; M. Lokajicek; J. Lozier; S. Luchuk; K. Maan; S. Magill; W.A. Mann; M.L. Marshak; K. Matera; V. Matveev; D.P. Méndez; M.D. Messier; H. Meyer; T. Miao; W.H. Miller; S.R. Mishra; R. Mohanta; A. Moren; L. Mualem; M. Muether; S. Mufson; R. Murphy; J. Musser; J.K. Nelson; R. Nichol; E. Niner; A. Norman; T. Nosek; Y. Oksuzian; A. Olshevskiy; T. Olson; J. Paley; P. Pandey; R.B. Patterson; G. Pawloski; D. Pershey; O. Petrova; R. Petti; S. Phan-Budd; R.K. Plunkett; R. Poling; B. Potukuchi; C. Principato; F. Psihas; A. Radovic; R.A. Rameika; B. Rebel; B. Reed; D. Rocco; P. Rojas; V. Ryabov; K. Sachdev; P. Sail; O. Samoylov; M.C. Sanchez; R. Schroeter; J. Sepulveda-Quiroz; P. Shanahan; A. Sheshukov; J. Singh; J. Singh; P. Singh; V. Singh; J. Smolik; N. Solomey; E. Song; A. Sousa; K. Soustruznik; M. Strait; L. Suter; R.L. Talaga; M.C. Tamsett; P. Tas; R.B. Thayyullathil; J. Thomas; X. Tian; S.C. Tognini; J. Tripathi; A. Tsaris; J. Urheim; P. Vahle; J. Vasel; L. Vinton; A. Vold; T. Vrba; B. Wang; M. Wetstein; D. Whittington; S.G. Wojcicki; J. Wolcott; N. Yadav; S. Yang; J. Zalesak; B. Zamorano; R. Zwaska
Results are reported from an improved measurement of νμ→νe transitions by the NOvA experiment. Using an exposure equivalent to 6.05×1020 protons on target, 33 νe candidates are observed with a background of 8.2±0.8 (syst.). Combined with the latest NOvA νμ disappearance data and external constraints from reactor experiments on sin22θ13, the hypothesis of inverted mass hierarchy with θ23 in the lower octant is disfavored at greater than 93% C.L. for all values of δCP. © 2017 American Physical Society.
Contributions to the Proterozoic–Phanerozoic successions in the Himalaya: Status report 2020-2024
(Springer Nature, 2024) Om. N. Bhargava; Birendra P. Singh; U.K. Shukla; J. Ganai; P. Singh; Alono Thorie; Priyanka Mazumdar
82 publications by Indian geoscientists pertaining to the Proterozoic–Phanerozoic have come out during the last four years (2020–2024). Guide Books for the IGC 2020, GSI publication on the Precambrian sequences and a publication on the evolution of the Lesser Himalaya provide glimpses of regional geology. Other publications deal with geochemistry, sedimentology, isotope geology, palaeontology, and stratigraphy. A succinct summary of the publications is presented with short comments where necessary. © Indian National Science Academy 2024.
CORROSION STUDIES OF ZINC IN AQUEOUS BINARY MIXTURES OF ACETONITRILE THROUGH POLARISATION TECHNIQUE.
(1987) L. Bahadur; P. Singh; Ravindra N. Singh
The nature of cathodic and anodic polarisation curves is the indicative of the fact that the corrosion of zinc in the present system is cathodically controlled. With an increase in acetonitrile content in the mixture cathodic polarisation curves at first shift towards higher current density and then after a particular acetonitrile content the shift is in reverse direction. The anodic polarisation curves shift in oscillatory manner with increasing acetonitrile content in the solvent mixture. The passivity is altogether absent in the anodic curves for all the representative concentrations. Stirring of the medium leads to the enhancement in corrosion rate. Accelerated weight loss measurement at a fixed potential shows a linear increase in weight loss with polarisation time.
CORROSION STUDIES OF ZINC IN AQUEOUS BINARY MIXTURES OF ACETONITRILE THROUGH POLARISATION TECHNIQUE.
(1987) L. Bahadur; P. Singh; Ravindra N. Singh
The nature of cathodic and anodic polarisation curves is indicative of the fact that the corrosion of zinc in the present system is cathodically controlled. With an increase in acetonitrile content in the mixture cathodic polarisation curves at first shift towards higher current density and then after particular acetonitrile content the shift is in reverse direction. The anodic polarisation curves shift in oscillatory manner with increasing acetonitrile content in the solvent mixture. The passivity is altogether absent in the anodic curves for all the representative concentrations. Stirring of the medium leads to the enhancement in corrosion rate. Accelerated weight loss measurement at a fixed potential shows a linear increase in weight loss with polarisation time.
Cyanobacteria in Antarctica: ecology, physiology and cold adaptation.
(2004) K.D. Pandey; S.P. Shukla; P.N. Shukla; D.D. Giri; J.S. Singh; P. Singh; A.K. Kashyap
Cyanobacterial species composition of fresh water and terrestrial ecosystems and chemical environment of water in Schirmacher Oasis in Continental Antarctica was investigated. Over 35 species of cyanobacteria were recorded. Diazotrophic species both heterocystous and unicellular contributed more than half to the count except in lake ecosystem. The species composition varied among the fresh water as well as terrestrial ecosystems. The physico-chemical analyses of water revealed its poor nurient content which might have supported the growth of diazotrophic cyanobacteria in an Antarctic environment. Among the cyanobacteria Oscillatoria, Phormidium and Nostoc commune were the dominant flora in most of the habitats. The physiological characteristics of isolated cyanobacteria strains indicated that N2-fixation, nitrate uptake, nitrate-reduction, ammonium-uptake, GS-transferase activity and photosynthesis was unaffected at low temperature (5 degrees C) which indicated low temperature adaptation for Antarctic cyanobacteria. This phenomenon was not evident in different strains of tropical origin. The temperature optima for N2-fixation for the different Antarctic cyanobacterial strains was in the range of 15-25 degrees C, nearly 10 degrees C lower than their respective reference strains of tropical origin. Similar results were obtained for cyanobacteria-moss association. The low endergonic activation energy exhibited by the above metabolic activities supported the view that cyanobacteria were adapted to Antarctic ecosystem.
DFT study of molecular geometries and vibrational characteristics of uracil and its thio-derivatives and their radical cations
(2010) R. Singh; S. Jaiswal; M. Kumar; P. Singh; G. Srivastav; R.A. Yadav
DFT calculations at the B3LYP/6-311++G** level have been carried out to study the vibrational characteristics of the neutral molecules, anionic and cationic radicals of uracil, 2-thiouracil and 4-thiouracil. In the U molecule, C{double bond, long}C bond loses its double bond character and magnitude of the C{double bond, long}C stretching frequency decreases significantly as a result of radicalization. Frequency for the in-plane deformation mode of C{double bond, long}O increases when a sulfur atom is substituted for the oxygen atom at the site C2 in the uracil molecule but decreases when a sulfur atom is substituted for the oxygen atom at the site C4. The magnitude of both the N-H stretching frequencies decreases in all the radical cations as compared to their neutral molecules. Radicalization leads to significant changes in the magnitudes and intensities corresponding to some of the normal modes for all the three cases. Removal of an electron leads to decrease in the electronic charge mainly from the sulfur atom in the case of 2-TU and 4-TU, whereas it is distributed over the sites N1, C5, O8 and O10 in case of the U molecule. © 2009 Elsevier B.V. All rights reserved.
Different modes of water pollution
(Kalpana Corporation, 2008) K.R.C. Reddy; P. Singh
Water is one of the most important natural resources in which, when the toxic substances enter, get dissolved or lie suspended or get deposited to make the water polluted. This results in the deterioration of the quality of water due to which the aquatic ecosystem, health of human beings and animals are adversely affected. Water pollution is a large set of adverse effects upon water bodies, such as lakes, rivers, oceans and groundwater caused by human activities. Water pollution is a major problem all over the world and it has been suggested that it is the leading worldwide cause of deaths and diseases and accounts for the deaths of more than 14,000 people daily. © 2008 - Kalpana Corporation.
Effect of Cannabis indica on locomotor activity
(1978) P. Singh; P.K. Das
The effect of a resin, extracted from C. indica, on locomotor activity was studied using 3 models, viz, activity cage, tunnel board (Shillito) and amphetamine induced hyperactivity. The resin showed no effect on locomotor activity of albino rats and mice at a lower dose (50 mg/kg), while at higher doses it reduced the locomotor activity. Analysis of the pooled data in all doses in both mice and rats did not show any excitatory effect. However, when the locomotor activity of individual mice in the activity cage or the tunnel board was analysed, the drug was shown to induce excitation in some animals and depression in the others; the number of animals showing excitation was relatively more in the lower dose and those showing depression were relatively high in the higher doses. Thus the effect of cannabis on the locomotor activity is not only dependent on the dose but also the individual animal. Experiments on tunnel board suggest that cannabis produces stereotyped behaviour in mice. Amphetamine induced hyperactivity in mice was inhibited by cannabis in a dose which had no effect on locomotor activity.
Effect of different sized CeO2 nano particles on decomposition and hydrogen absorption kinetics of magnesium hydride
(2013) Rajesh Kumar Singh; T. Sadhasivam; G.I. Sheeja; P. Singh; O.N. Srivastava
In present paper, different sizes of CeO2 nanoparticles were synthesized by ball milling and their effect on the absorption kinetics and decomposition temperature of MgH2 was studied. It was found that a small amount of admixing of the above said catalysts with MgH2 exhibits improved hydrogen storage properties. Among these different sizes of CeO2 nanoparticles, 2 weight % admixed CeO2 with a particle size of ∼10-15 nm led to decrease in desorption temperature by ∼50 K. Moreover, it also shows 1.5 times better absorption kinetics with respect to pure MgH2. The samples were characterized using SEM, TEM and XRD techniques. The hydrogenation/dehydrogenation properties were measured by gas reaction controller. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
ELECTROCHEMICAL BEHAVIOR OF BRASS (CuZn 63:37) IN BINARY MIXTURES OF N,N-DIMETHYLFORMAMIDE AND WATER.
(1986) P. Singh; L. Bahadur; R.N. Singh
The electrochemical behavior of brass has been studied in N, N-dimethylformamide (DMF) and water mixtures at 30 C using the potentiostatic polarization technique, weight loss method, and solution analysis. The effects of dissolved oxygen and stirring have also been studied. The dissolution of brass has been found to be cathodically controlled, with the metal being more anodically active in the region of the greater percentage of water. The weight loss and solution analysis reveal preferential dissolution of zinc in the initial stages, which decreases progressively with time.