Showing papers by "University of Rajasthan published in 1992"
Journal Article•
TL;DR: Results suggest that the contraceptive effects of chloroform extract of papaya seeds are mainly post-testicular in nature without influencing toxicological profile and libido of the animals.
Abstract: Crude chloroform extract of C. papaya seeds (5 mg/animal/day, po, for 20, 40 and 60 days) was investigated for contraceptive efficacy and related side effects in male albino rats. The crude extract reduced fertility to zero per cent by 40 to 60 days of treatment. Suppression of cauda epididymal sperm motility was the most pronounced effect of the drug administration. Scanning electron microscopic observations revealed treatment induced abnormalities in sperms. Cauda epididymal and testicular sperm counts decreased following treatment. Clinical parameters did not show any alterations. Results suggest that the contraceptive effects of chloroform extract of papaya seeds are mainly post-testicular in nature without influencing toxicological profile and libido of the animals.
64 citations
01 Jan 1992
TL;DR: The development and the current status of the Solution-Sol-Gel (SG) process for preparation of different ceramic materials in various (i.e., bulk, powder, wire, thin film, aerogel, etc.) forms and shapes have been outlined in this paper.
Abstract: The development and the current status of the Solution-Sol-Gel or the Sol-Gel (SG) process for preparation of different ceramic materials in various (i.e., bulk, powder, wire, thin film, aerogel, etc.) forms and shapes have been outlined in this article.
37 citations
TL;DR: In this article, non-statistical fluctuations are used to probe the dynamical behaviour of multi-particle production in heavy-ion interactions at ultra-relativistic energies.
30 citations
TL;DR: In this paper, the structure of a representative compound Cu[S2 POCH 2 C(CH 3 ) 2 CH 2 O ]·2P(C6H5)3 has been characterized by single crystal diffraction.
29 citations
TL;DR: In this article, the results of atmospheric free fall dust catalysed S(IV) autoxidation in acetate buffered suspensions are in conformity with the rate law: − d[S(IV)] dt = k 6 [S[IV] [H + ] 1.30 + k 7 [dust] 0.42 [S|S| 2 [H|H| 1.36]
27 citations
TL;DR: In this article, the synthesis and biological activity of all types of fluorinated benzimidazole derivatives are discussed and classified on the basis of the position of fluorine or fluorinated groups.
22 citations
01 Jan 1992
TL;DR: Complete recovery of all the altered parameters except sperm motility in the high dose intramuscular group was evident following 60 and 45 days of treatment withdrawal in animals dosed orally an...
Abstract: A crude ethanol extract of Carica papaya L. seeds was administered to male albino rats at dose regimens of 10 and 50 mg/animal/day orally for 30, 60 and 90 days and 0.1 and 1.0 mg/animal/day intramuscularly for 15 and 30 days for the evaluation of contraceptive efficacy, reversibility and related side effects. Significant decreases in cauda epididymal sperm motility, sperm count, fertility and litter size were observed after oral dosing of the extract, while intramuscular administration caused significant decreases in cauda epididymal sperm motility and litter size. Testis weight decreased significantly after oral, but not intramuscular, administration. Body weight response, hematological parameters and blood/serum biochemical parameters were comparable to control values throughout the experimental period. Complete recovery of all the altered parameters except sperm motility in the high dose intramuscular group was evident following 60 and 45 days of treatment withdrawal in animals dosed orally an...
19 citations
TL;DR: In this paper, the energy and centrality dependence of local particle pseudorapidity densities as well as validity of various parametrizations of the distributions are examined and the dispersion, σ, of the rapidity density distribution of produced particles varies slowly with centrality and is 0.80, 0.98, 1.21 and 1.41 for central interactions at 3.7, 14.6, 60 and 200A GeV incident energy.
Abstract: The energy and centrality dependence of local particle pseudorapidity densities as well as validity of various parametrizations of the distributions are examined. The dispersion, σ, of the rapidity density distribution of produced particles varies slowly with centrality and is 0.80, 0.98, 1.21 and 1.41 for central interactions at 3.7, 14.6, 60 and 200A GeV incident energy, respectively, σ is found to be independent of the size of the interacting system at fixed energy. A novel way of representing the window dependence of the multiplicity as normalized variance versus inverse average multiplicity is outlined.
19 citations
TL;DR: In this article, the effect of Mn doping on the superconducting properties of YBa2Cu3-x MnxO∼7 system has been studied and an attempt has been made to understand the Tc depression with Mn doping from our neutron diffraction and Hall effect results.
18 citations
TL;DR: The roots of Eclipta erecta afforded a new dithienylacetylene ester along with several previously reported thiophene derivatives as discussed by the authors, which was later reported in the literature.
17 citations
TL;DR: In this article, a trigonal bipyramidal geometry for the resulting tririorganotin(IV) complexes has been proposed, where the nitrogen atom occupies the axial site, while two methyl groups rest in equatorial positions.
Abstract: Triorganotin(IV) complexes having an azomethine linkage have been prepared by the substitution reactions of trimethyl tin chloride with heterocyclic thiosemicarbazones and characterized by elemental analyses, molecular weight determinations and conductivity measurements. On the basis of infrared, 1H, 13C and 119Sn NMR spectroscopy studies, a trigonal bipyramidal geometry for the resulting complexes has been proposed. The nitrogen atom occupies the axial site, while two methyl groups rest in equatorial positions. The antifungal activity of some of the ligands and their metal complexes has also been evaluated against different pathogenic fungi.
TL;DR: The title compounds 3 and 7 are novel heterocyclic systems incorporating two-coordinate phosphorus as mentioned in this paper, obtained in reasonable to good yields from the condensation of suitable 2-ethyl-3-alkylthiazolinium and -benzothiazolium bromides 2 and 6 with phosphorus trichloride in the presence of triethylamine in an aprotic solvent.
Abstract: The title compounds 3 and 7 are novel heterocyclic systems incorporating two-coordinate phosphorus. They are obtained in reasonable to good yields from the condensation of suitable 2-ethyl-3-alkylthiazolinium and -benzothiazolium bromides 2 and 6 with phosphorus trichloride in the presence of triethylamine in an aprotic solvent. Intermediate dichlorophosphino-substituted N-ylides can be observed or isolated in some cases. From a 2-methyl-3-alkylthiazolinium bromide (2a), a 1-(dichlorophosphino) substituted 1, 3-azaphospholo[5,1-b]thiazoline (4) was obtained.
The chemical shift of the two-coordinate phosphorus in 1,3-azaphosphole derivatives clearly reflects the influence of the heterocyclic system annulated to its 1,5-bond and of the substituents in its 2-and 4-positions.
TL;DR: Solasodine treatment prevented the accumulation of cholesterol in the liver and aorta and regressed plaque size in the thoracic and abdominal aortA and Faecal excretion of cholesterol and phospholipids was significantly increased suggesting that modulation of absorption was affected.
Abstract: Solasodine (C 27 H 42 O 2 N), a nitrogen analogue of diosgenin reduced serum cholesterol and LDL cholesterol by 73.3% and 73.5% and prevented atherogenesis (Atherogenic index-control: 1.99; athero- group: 3.12; solasodine treatment 2.12-2.32). The cholesterol/phospholipid ratio was decreased by 42.02% while the HDL ratio was raised significantly. Solasodine treatment prevented the accumulation of cholesterol in the liver and aorta and regressed plaque size in the thoracic and abdominal aorta. Faecal excretion of cholesterol and phospholipids was significantly (p>0.001) increased suggesting that modulation of absorption was affected
TL;DR: In this paper, a binuclear complex consisting of two platinum atoms held together by TePh and Cl bridges was characterized by elemental analysis and 1H and 31P NMR data, and the crystal structure of [Pt2Cl2(μ-Cl)(μ-TePh)(PBun3)2] was shown.
TL;DR: In this paper, the compositions [Cl4−nSn{Al(OPri)4}n] (where n = 1-3) and [Cl2Sn{OBut]4}2] have been synthesized by the reactions of SnCl4 with the appropriate potassium alkoxoaluminate in the requisite molar ratio.
TL;DR: Bromine does not add to phosphorus in a 2-phosphaindolizine 1 but substitutes its 1position as mentioned in this paper, and the resulting 1-dichlorophosphino derivatives 5 easily undergo a substituent exchange at the exocyclic phosphorus.
Abstract: Bromine does not add to phosphorus in a 2-phosphaindolizine 1 but substitutes its 1-position. The 1-bromo derivatives 2 are best prepared with Br2/NEt3 or N-bromosuccinimide. Their hydrolysis is remarkable; it involves a debromination of C-1, an oxidation of P and a selective opening of the P/C-3 bond.
PCl3 also causes a substitution of the 1-position. The resulting 1-dichlorophosphino derivatives 5 easily undergo a substituent exchange at the exocyclic phosphorus. More 1-phosphino derivatives are formed in the reaction of 1 with phenyl and diazaphospholyl dichlorophosphine.
TL;DR: In this article, the FeTi and TiNi thin films were obliquely deposited at 45°, under 10 −5 torr pressure onto a glass substrate by thermal evaporation.
TL;DR: In this article, the transient plane source (TPS) technique was employed to measure experimentally the thermal conductivity of three selected steel samples, taking into account factors such as the composition and the nature of the alloying elements.
Abstract: The transient plane source (TPS) technique was employed to measure experimentally the thermal conductivity of three selected steel samples. Measured values of thermal conductivities are critically analysed, taking into account factors such as the composition and the nature of the alloying elements. An effort is made to determine the temperature dependence of thermal conductivity of these samples from room temperature to 300°C. Results of the present measurements are also discussed in the light of the values of thermal conductivity on equivalent steels measured by other workers.
TL;DR: The crystal structure of the title compound PhAs(S2COPri)2 has been determined by single crystal X-ray diffraction and refined by full matrix least squares analysis with anisotropic temperature factors.
Abstract: The crystal structure of the title compound PhAs(S2COPri)2 has been determined by single crystal X-ray diffraction and refined by full matrix least squares analysis with anisotropic temperature factors. The crystal is monoclinic, space groupP21/c,a=8.889(6),b=16.174(19),c=13.506(14) A,β=102.02(7)°,V=1899.2 A3,Z=4,Dc=1.478 g cm−3, monochromated Mo-Kα radiation, λ=0.71069 A,μ=22.07 cm−1.
TL;DR: Several new complexes of Sb(III and Bi(III) with thiosemicarbazones of furfuraldehyde, thiophene-2-carbaldehyde, indol-3-caraldehyde and pyridine-2 carbaldehyde have been prepared and characterized by elemental analysis, conductivity, molecular weight determination and IR, 1H-and 13C-NMR spectral studies.
Abstract: Several new complexes of Sb(III) and Bi(III) with thiosemicarbazones of furfuraldehyde, thiophene-2-carbaldehyde, indol-3-carbaldehyde and pyridine-2-carbaldehyde have been prepared and characterized by elemental analysis, conductivity, molecular weight determination and IR,1H-and13C-NMR spectral studies. The ligands form complexes of the typeMX3L[M=Sb(III) or Bi(III);X=chloride;L=ligand] which are found to be non-electrolytes inDMF. Spectral data indicate that the thiosemicarbazones act as bidentate ligands through the azomethine nitrogen and sulphur.
TL;DR: In this article, the rate law was observed to obey the kinetics of the reaction in acetate buffered solutions and the reactivity order was found to be H2O2 S2O82−.
Abstract: The kinetics of the reaction (1) obey the rate law (2) in acetate buffered solutions A comparison with H2O2 and S2O82− shows the reactivity order to be H2O2 S2O82− © John Wiley & Sons, Inc
TL;DR: In this article, the Smiles rearrangement of 3,4-dichloro-2-formamido-2′-nitro-4′-substituted-diphenyl sulphides has been reported.
TL;DR: In this article, the results of resistivity and X-ray absorption measurements on Bi 2 Ca 1 Sr 2 Cu 2 O y (BISCCO) with partial substitution of Fe varying from 0 to 5% in place of Cu were reported.
Abstract: We report the results of resistivity and X-ray absorption measurements on Bi 2 Ca 1 Sr 2 Cu 2 O y (BISCCO) with partial substitution of Fe varying from 0 to 5% in place of Cu. The X-ray diffraction patterns (XRD) of different samples confirm the single-phase nature. With progressive doping of Fe orthorhombicity and structural disorder are observed. The transition temperature T c is decreasing monotonically with Fe doping and the rate of T c decrease is around 7 K per at.% of the nominal substitution. The X-ray absorption near-edge structure (XANES) results show that Fe is incorporated in the lattice with FeO bonds substituting for CuO bonds and Fe is present predominantly in the trivalent state.
TL;DR: In this article, the rate law for the autoxidation of SIV to SVI in acetate buffered aqueous suspensions of Ni2O3 obeys the rate-law Robs=(k4+k5[H+]−1)[Ni 2O3][SIV][O2]
Abstract: Autoxidation of SIV to SVI in acetate buffered aqueous suspensions of Ni2O3 obeys the rate law Robs=(k4+k5[H+]−1)[Ni2O3][SIV][O2] The suggested mechanism requires the adsorption of O2 on the Ni2O3 surface, followed by the reaction of HSO
3
−
and SO
3
2−
with these oxygenated particles.
TL;DR: In this paper, the synthesis of new sulfur containing spiroindole derivatives is reported, and the compounds have been characterised on the basis of elemental and spectral studies, which are obtained by the reaction of 3-[2-(4-arylthiazolylimino)]-1,3-dihydro-2H-indol-2-one with o-mercaptobenzoic acid and mercaptoacetic acid.
Abstract: The synthesis of some new sulfur containing spiroindole derivatives is reported. Spiro[2H-1,3-benzothiazine-2,3′-[3H]indole]-2′,4(1′H,3H)-diones and spiro[3H-indole-3,2′-thiazolidine]-2,4′(1H)-diones were prepared by the reaction of 3-[2-(4-arylthiazolylimino)]-1,3-dihydro-2H-indol-2-one with o-mer-captobenzoic acid and mercaptoacetic acid respectively. Such spiro benzothiazineindoles are being reported for the first time. The compounds have been characterised on the basis of elemental and spectral studies.
TL;DR: In this paper, the phonon frequencies of a binary metallic glass, employing a simple model approach, were derived both for longitudinal and transverse branches of phonon frequency for self-consistent screening of conduction electrons with and without the inclusion of correlation effects.
Abstract: Analytical expressions for the phonon frequencies of a binary metallic glass, employing a simple model approach, are derived both for longitudinal and transverse branches of phonon frequencies. Our model assumes a central force, effective between the nearest neighbours, and a volume-dependent force. The computation of the phonon frequencies of the longitudinal and transverse phonons in Mg70Zn30 glass is carried out both for self-consistent screening of conduction electrons with and without the inclusion of correlation effects. Phonon frequency expressions reproduce the main characteristics features of the dispersion curves obtained by molecular dynamics and neutron inelastic scattering for the longitudinal branch for few momentum transfers near the first peak of static structure factor.
TL;DR: In this paper, the results of the spectroscopic studies indicate that the semicarbazone ligands act as bidentate in all the complexes and the molecular weight determinations indicate that all the compounds are monomeric.
Abstract: New complexes of Sb(III) and Bi(III) with semicarbazones of the general formulae SbCl3
L and BiCl3
L (whereL=semicarbazones) have been prepared and characterized by IR,1H- and13C-NMR spectral measurements. The results of the spectroscopic studies indicate that the semicarbazone ligands act as bidentate in all the complexes. All complexes are non-electrolytes inDMF solution. The molecular weight determinations indicate that the compounds are monomeric.
TL;DR: In this paper, the frequencies of the longitudinal and transverse phonon modes in a binary metallic glass (Cu57Zr43) based on a simple model approach have been presented, assuming a central force effective between nearest neighbours, and a volume dependent force.
Abstract: Computations of the frequencies of the longitudinal and transverse phonon modes in a binary metallic glass (Cu57Zr43) based on a simple model approach have been presented. The model assumes a central force effective between nearest neighbours, and a volume dependent force. Both types of excitations of phonons are computed for the self-consistent screening and are compared to those computed by Kobayashi and Takeuchi using recursion method.
TL;DR: In this article, the elastic and thermodynamic properties of metallic glasses (Ca70Mg30, Mg70Zn30, Cu57Zr43 and Pd77.5Si16.5) were derived from dispersion relations in the low momentum region derived by various dielectric screenings, adopting a simple model given by Bhatia and Singh.
Abstract: The elastic and thermodynamic properties of metallic glasses (Ca70Mg30, Mg70Zn30, Cu57Zr43 and Pd77.5Si16.5Cu6) are obtained from dispersion relations in the low momentum region derived by us for various dielectric screenings, adopting a simple model given by Bhatia and Singh. This model assumes a central force, effective between nearest neighbours and a volume dependent force. For elastic properties, elastic constantsC
11 andC
44 are obtained from slopes of longitudinal and transverse dispersion relations, respectively, whereasC
12 is found by the requirement that elastic anisotropy for disordered systems, like metallic glass, is to be zero. For thermodynamic properties, Debye temperature is calculated for the glasses for various dielectric screenings.