Showing papers by "University of Rajasthan published in 1984"
138 citations
TL;DR: In this article, the properties of five and six-coordinated di and tri-n-butyl tin(IV) semi-and thio-semi carbazates have been characterized by IR, NMR, and Mass spectroscopy.
76 citations
TL;DR: In this paper, the effect of finite ion temperature on the amplitude of the soliton and its width was studied as a function of E 0, where E 0 is the slope of the potential profile at points of equilibrium particle density.
Abstract: Finite amplitude ion-cyclotron and ion-acoustic waves and solitons propagating obliquely in a magnetized warm-ion plasma are considered using exact ion dynamics and quasi-neutrality. The effect of finite ion temperature is to decrease the amplitude of the soliton and increase its width. The behaviour of the amplitudes of ion-cyclotron and ion-acoustic waves is studied as a function of E0, where E0 is the slope of the potential profile at points of equilibrium particle density.
42 citations
TL;DR: Indian Muslim school boys, ages 13 to 15 years, whose parents are first cousins, were compared with classmates whoseParents are genitically unrelated on the Raven Standard Progressive Matrices, a nonverbal test of intelligence.
Abstract: Indian Muslim school boys, ages 13 to 15 years, whose parents are first cousins, were compared with classmates whose parents are genitically unrelated on the Raven Standard Progressive Matrices, a nonverbal test of intelligence. The inbred group (N=86) scored significantly lower and had significantly greater variance than the noninbred group (N=100), both on raw scores and on scores statistically adjusted to control for age and socioeconomic status. Genetic theory predicts both of these effects for a polygenic trait with positive directional dominance.
41 citations
TL;DR: In this paper, an integrated theory for the effective thermal conductivity of all kind of two-phase materials, including loose materials, is developed, where the flux modification is carried out by considering the effective neighbouring interactions in the solution of Poisson's equation.
Abstract: Assuming a regular geometry of dispersed phase (λ 2) an integrated theory for the effective thermal conductivityλ e of all kind of two-phase materials (including loose materials) is developed. The flux modification is carried out by considering the effective neighbouring interactions in the solution of Poisson’s equation. A comparison of calculatedλ e values with the reported experimental results over a wide range of two-phase materials shows a good agreement.
33 citations
TL;DR: In this paper, a six coordinated octahedral structure has been suggested in solution of diorganotin(IV) dichlorides with ammonium O,O-alkylenedithiophosphates.
31 citations
TL;DR: In this article, a mixture of metal chlorides with ammonium alkylenedithiophosphates at 1 : 1 and 1 : 2 molar ratios was obtained.
31 citations
TL;DR: O,O-alkylenedithiophosphate derivatives of the general formula were synthesized and characterized by elemental analyses and molecular weight determinations in this paper, and their new complexes are soluble in common organic solvents, and their IR and NMR (1H, 31P) spectral data have been used to investigate a plausible geometry.
30 citations
TL;DR: Bis -xanthates of phenylarsenic(III) have been synthesized and characterized by elemental analysis, molecular weight, IR, NMR (1 H and 13 C) and mass spectral data which have been discussed in relation to plausible structures for these arsenic derivatives as mentioned in this paper.
27 citations
TL;DR: A sucrose supply of 2% in conjunction with the combination of all three hormones, however, was needed to achieve maximal thylakoid formation including stacking in individual chloroplasts and for the very extensive chloroplast multiplication in explants growing with high cell division activity.
Abstract: Chromoplasts, which exist in the cells of freshly isolated carrot root explants, seemed to be transformed in thylakoid containing plastids, and chlorophyll formation was initiated if the explants were cultured in a liquid medium containing inositol and IAA as a hormonal supplement. This process was intensified when kinetin was also added, but no dependence on a sucrose supply could be found.
26 citations
TL;DR: Tetraisopropoxyaluminate of copper undergoes alcoholysis reactions with various alcohols and acetylacetone to yield Cu[Al(OR)4]2.
Abstract: Tetraisopropoxyaluminate of copper undergoes alcoholysis reactions with various alcohols and acetylacetone to yield Cu[Al(OR)4]2, where RO = methoxy, ethoxy, 2,2,2-trifluoroethoxy, 2,2,2-trichloroethoxy, 1,3,-dibromo-2-propoxy, n-butoxy, teriary butoxy and pentoxy amyl and acetylacetone. Various physico-chemical studies like infrared, visible reflectance, and electron spin resonance and magnetic susceptibility measurements as well as molecular weight and elemental analysis have been made to throw light on the structural features of these derivatives. These studies suggest an octahedral environment for copper(II) in these derivatives.
Synthese und Eigenschaften von Tetraalkoxyaluminaten und deren Kupfer(II)-Komplexe
Tetraisopropoxyaluminate zeigen Alkoholyse-Reaktionen mit verschiedenen Alkoholen und Acetylaceton unter Bildung von Cu[Al(OR)4]2 (worin RO ist: Methoxy-, Ethoxy-, 2,2,2-Trifluoroethoxy-, 2,2,2-Trichloroethoxy-, 1,3-Dibromo-2-propoxy-, n-Butoxy-, tert-Butoxy-, Pentoxy- und Acetylaceton). Verschiedene physikalische Untersuchungen wie IR, Reflexions- und ESR-Spektroskopie sowie magnetische Messungen, Molekulargewichtsbestimmungen und Elementar- analysen wurden zur Aufklarung der Strukturen dieser Derivate eingesetzt. Die Ergebnisse weisen auf eine oktaedrische Koordination fur das Kupfer(II) in diesen Verbindungen.
TL;DR: A series of neutral adducts of tin(IV) chloride with various nitrogen donor ligands of general formula, SnCl4·L and SnCl 4·L2 (where L = azines, semi-and thiosemi-carbazones) have been synthesized as discussed by the authors.
TL;DR: In this article, cobalt tetraisopropoxyaluminate reacts with various alcohols to yield derivatives with the formula, Co[Al(OR)4]2 when ROH=methanol, ethanol, 2,2,2,-trifluoroethanol and 2.2, 2-trichloroethanol; n-butanol and 1,3-dibromo-2-propanol.
Abstract: Cobalt(II) tetraisopropoxyaluminate reacts with various alcohols to yield derivatives with the formula, Co[Al(OR)4]2 when ROH=methanol, ethanol, 2,2,2,-trifluoroethanol, 2,2,2-trichloroethanol, n-butanol and 1,3-dibromo-2-propanol. The reactions with 1,1 ' -dimethylethanol (tertiary butyl alcohol) and 1,1 ' -dimethyl-propanol (tertiary amyl alcohol) yielded derivatives with the formulae, Co[Al(OPr i )(OBu t )3]2 and Co[Al(OPr i )2(OAm t )2]2 respectively. With acetylacetone (Hacac) in 1:4 molar ratio, Co[Al(OPr i )4]2 gave a volatile derivative, Co[Al(OPr i )2(acac)2]2 whereas an excess acetylacetone yielded a mixture of Co(acac)2 and Al(acac)3. These derivatives have been characterized by elemental analyses, infra-red and electronic reflectance spectra, molecular weight determinations and magnetic susceptibility measurements. These studies suggest an octahedral environment (D4h) for cobalt(II).
TL;DR: The results show that retinol palmitate has a different effect on dedifferentiating cells of a regenerating limb from that on cells that are differentiating in a normally developing limb.
Abstract: In young Bufo melanosticus tadpoles at the spatula stage of limb development, the left hindlimb was amputated through the shank and the right hindlimb was left intact. One day later, when the amputation surface was covered by wound epidermis, the tadpoles were immersed in 15 IU/ml of retinol palmitate solution for 2 days up to blastema formation and thereafter reared in plain water. Contrary to the situation in untreated controls, all the resultant regenerates of the vitamin-treated tadpoles were complete limbs containing elements from the pelvic girdle to the phalanges. Retinol palmitate treatment inhibited the development of the foot in the unamputated right limbs. These results show that retinol palmitate has a different effect on dedifferentiating cells of a regenerating limb from that on cells that are differentiating in a normally developing limb.
TL;DR: The tissue concentrations of calcium, magnesium, nitrogen and phosphorus in the leaves and vertical branches of rhizomes of Typha elephantina Roxb were studied near Jaipur (India) during 1975–1976 and showed clear trends of seasonal change.
TL;DR: The immature unpollinated disc florets showed differentiation of a large number of shoot primordia on MS (Murashige and Skoog, 1962) basal medium supplemented with BAP and IAA, and could be maintained for two years by subculturing the callus together with developing shoot buds.
TL;DR: In this article, a number of methods of construction of partially balanced incomplete block designs with nested rows and columns are developed and new balanced incomplete blocks are obtained as a by-product.
Abstract: A number of methods of construction of partially balanced incomplete block designs with nested rows and columns are developed and new balanced incomplete block designs with nested rows and columns are obtained as a by-product.
TL;DR: Histological studies revealed a unique mode of meristemoid formation in Brassica campestris cv that was induced in callus and suspension cultures of hypocotyl origin.
Abstract: Prolific shoot bud differentiation was induced in callus and suspension cultures of hypocotyl origin in Brassica campestris cv Yellow Sarson on MS medium supplemented with K (139–232 μM) or BA (133–221 μM) Plantlets were obtained by rooting the in vitro differentiated shoots Histological studies revealed a unique mode of meristemoid formation
TL;DR: The green algae, particularly the species of Ankistrodesmus, Chlorella, Crucigenia and Selenastrum, increased considerably and replaced the blue-green algae, of which Oscillatoria and Microcystis disappeared totally.
Abstract: Water hyacinth (Eichhornia crassipes (Mart.) Solms.) invaded a eutrophic reservoir receiving domestic sewage near Jaipur (India) during 1975 and gradually developed a complete thick cover over the whole water body during Sept.–Oct. 1978. The physico-chemical characteristics of the water and the phytoplankton composition were studied during Sept. 1977–Sept. 1979 by fortnightly sampling. The changes observed during the second year of study are ascribed to the water hyacinth cover. The important changes were: lowering of water temperature, pH, dissolved oxygen content and nitrate nitrogen, and increase in total alkalinity, free carbon dioxide, chemical oxygen demand, ammonia nitrogen, sulphides, calcium, magnesium and phosphate phosphorus. The changes in the phytoplankton were both qualitative and quantitative. The green algae, particularly the species of Ankistrodesmus, Chlorella, Crucigenia and Selenastrum, increased considerably and replaced the blue-green algae, of which Oscillatoria and Microcystis disappeared totally. The densities of several other taxa changed significantly.
TL;DR: In this paper, the integrated theory derived for the lattice-type dispersions is modified and extended to estimate the effective thermal conductivity of loose and granular two-phase materials at normal pressure assuming an effective continuous media approximation.
Abstract: The integrated theory derived for the lattice-type dispersions is modified and extended to estimate the effective thermal conductivity of loose and granular two-phase materials at normal pressure assuming an effective continuous media approximation. A comparison of calculated values ofλ
e
with the reported experimental results over a wide range of loose and granular two-phase materials shows a good agreement.
TL;DR: In this article, a number of bimetallic alkoxides of Be and Al with the general formulae Be [Al (OR)4]2 (where R = Me, Et, Prn, Bun, Bu1, Bus and Ami) or Be[Al(OPri) (OR') 3]2(where R' = But or Amt), have been synthesised by alcoholysis reactions of Be[Ori) 4]2.
Abstract: Bimetallic alkoxides of Be and Al with the general formulae Be [Al (OR)4]2 (where R = Me, Et, Prn, Bun, Bu1, Bus and Ami) or Be [Al(OPri) (OR') 3]2 (where R' = But or Amt), have been synthesised by alcoholysis reactions of Be[Al(OPri)4]2. With the exception of Be[Al (OMe)4]2 and Be[Al (OEt)4]2, all these products are volatile under reduced pressure, soluble in common organic solvents and monomeric in refluxing benzene. All these products are highly susceptible to hydrolysis even by atmospheric moisture. The new compounds have been characterized by elemental analysis, ir and pmr spectra.
TL;DR: In this paper, the electron-momentum distribution of three vanadium silicides VSi2, V5Si3 and V3Si was studied using a γ-ray Compton scattering technique.
Abstract: Charge transfer and electron-momentum distribution of the three vanadium silicides VSi2, V5Si3 and V3Si have been studied using a γ-ray Compton scattering technique The results support the model where charge transfer takes place from silicon to vanadium atoms The charge transfer value, however, turns out to be smaller than that reported by Staudenmann et al (1976) from charge density measurements on V3Si Despite widely different stoichiometry and crystal structure, the electronic state of silicon atoms in VSi2 and V5Si3 appears to be identical The nature of bonding in these silicides is discussed in terms of a superposition model A proper solid-state calculation is, however, needed to explain the details of electron momentum distributions in these compounds
01 Mar 1984
TL;DR: It appears that, if suitably administered, vitamin A can make the limb regeneration blastema of amphibians completely equivalent to the original limb bud, probably by intensifying dedifferentiation of its cells.
Abstract: Young tadpoles of the toad,Bufo melanostictus (Schneider), were immersed in 15 IU/ml vitamin-A palmitate solution for 3 days, only prior to amputation through the shank. In more than 65% of cases the resultant regenerates were whole limbs containing the skeletal elements from femur to phallanges; in several of them a new girdle had also differentiated. In others regenration had progressed only up to the blastema stage and postblastemic development was inhibited. Opposite results were obtained when treatment was extended to another 3 days after amputation. A normal control-type regenerate consisting of parts distal to amputation level was not obtained in any case treated in either manner. The removed distal part of the shank was not restored in any treated case. It appears that, if suitably administered, vitamin A can make the limb regeneration blastema of amphibians completely equivalent to the original limb bud, probably by intensifying dedifferentiation of its cells. It is suggested that this chemical can be a useful tool to investigate the biochemical and genetic changes which occur during dedifferentiation and also whether through this process differentiated cells can really revert to a pluripotent state.
TL;DR: Tallium(I) alkylenedithiophosphates are high melting white solids, insoluble in common organic solvents but soluble in pyridine and DMF in which they show nonelectrolytic behaviour as discussed by the authors.
TL;DR: The structures of the volatile bimetalliciso-propoxides of later 3D metals with the general formula, [M{Al(OPr-i)4}n] where M=CrIII, MnII, FeIII, CoII, NiII and CuII have been investigated by visible reflectance and electron spin resonance spectroscopy as well as magnetic measurements as mentioned in this paper.
Abstract: The structures of the volatile bimetalliciso-propoxides of later 3d metals with the general formula, [M{Al(OPr-i)4}n] where M=CrIII, MnII, FeIII, CoII, NiII and CuII have been investigated by visible reflectance and electron spin resonance spectroscopy as well as magnetic measurements
TL;DR: In this article, the synthesis of the title compounds by the Smiles rearrangement has been reported, and Spectral studies are also included, where the authors show that 3-chloro/methyl-2-formamido-2′-nitro-4′-substituted diphenyl sulphides have been obtained by the formylation of the diphensyl sulfides obtained by condensation of 2-amino-3-chloroenthiophenols with substituted o-halogenonitrobenzenes in ethanolic sodium
TL;DR: Bis-derivatives of phenylantimony(III) with some monothio-β-diketones have been synthesized and characterized as five coordination species by elemental analyses, molecular weight and spectral data.
TL;DR: In this paper, a 1:1 isomeric mixture of spiro[3H-indole-3,2′-oxiran]-2(1H)-ones is formed.
TL;DR: In this article, the application of electrogenerated iodonium ion acting as catalytic electron carrier was taken into account in the intramolecular oxidative cyclization reaction of 2-nitroaniline on graphite anode in the preparation of benzofuroxan, which is of great synthetic utility.