Showing papers by "Aligarh Muslim University published in 1984"
TL;DR: Delbosco et al. as discussed by the authors established fixed point theorems for selfmaps of complete metric spaces by altering the distances between the points with properties: the use of a function (0 : R -*• R satisfying the following1. cp is continuous and strictly increasing in R ;2. ip(t) = 0 if and only if t = 0 ;3.
Abstract: Let R be the set of nonnegative real numbers and N the set ofpositive integers.Delbosco [/] and Skof [&] have established fixed point theorems forselfmaps of complete metric spaces by altering the distances between thepoints withproperties: the use of a function (0 : R -*• R satisfying the following1. cp is continuous and strictly increasing in R ;2. ip(t) = 0 if and only if t = 0 ;3.
670 citations
TL;DR: Increased rate of lipid peroxidation and decreased levels of phospholipids followed the similar rank order as that of increasing lead concentration was spinal cord, cerebellum, cerebral cortex and brain stem after lead intoxication.
265 citations
77 citations
TL;DR: In this article, the governing equations of motion for the nonaxisymmetric and axisymmetric variational of a general multilayered cylindrical shell having an arbitrary number of orthotropic material layers have been derived using variational principles.
Abstract: The governing equations of motion for the nonaxisymmetric and axisymmetric variational of a general multilayered cylindrical shell having an arbitrary number of orthotropic material layers have been derived using variational principles. The refined analysis considers bending, extension, and shear deformations in all layers of a multilayered cylindrical shell, including rotary and longitudinal translatory as well as transverse inertias. The solution for a radially simply supported shell has been obtained and the procedure for determining the damping effectiveness in terms of the system loss factor for all families of the modes of vibration in a multilayered shell with elastic and viscoelastic layers is reported. Numerical results are reported in Part II of the paper.
68 citations
TL;DR: In this paper, a c.17 ± 0.3 year core, calibrated for total s activity recovered from Sentik Glacier (4908m) Ladakh, Himalaya, yields several recognizable periodicities including subannual, annual, and multi-annual.
Abstract: Spectral analysis of time series of a c. 17 ± 0.3 year core, calibrated for total s activity recovered from Sentik Glacier (4908m) Ladakh, Himalaya, yields several recognizable periodicities including subannual, annual, and multi-annual. The time-series, include both chemical data (chloride, sodium, reactive iron, reactive silicate, reactive phosphate, ammonium, δD, δ(18O) and pH) and physical data (density, debris and ice-band locations, and microparticles in size grades 0.50 to 12.70 μm). Source areas for chemical species investigated and general air-mass circulation defined from chemical and physical time-series are discussed to demonstrate the potential of such studies in the development of paleometeorological data sets from remote high-alpine glacierized sites such as the Himalaya.
68 citations
TL;DR: In this paper, the effect of these wastes on saprophytic and nitrifying bacteria was studied with varying concentrations of the waste using sucrose substrate as a source of C chain for microorganisms.
Abstract: Chrome electroplating wastes were collected from two industrial sites and analyzed for color, turbidity, pH, alkalinity, sulfate, chloride, N-ammonia, N-nitrate, N-nitrite, acid hydrolyzable P, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, chromate and chromium(VI). The effect of these wastes on saprophytic and nitrifying bacteria was studied with varying concentrations of the waste using sucrose substrate as a source of C chain for microorganisms. The use of clay sand mixtures as adsorbents for chromate and chromium(VI) was investigated. Mixtures high in clay content were found to be suitable media for the removal of Cr from the wastes. The clay used was characterized by determination of the following parameters: pH, electrical conductivity, water soluble salts, osmotic pressure, cation exchange capacity, CaCO3 and organic matter.
63 citations
TL;DR: In this paper, the authors present a solution de l'analyse de vibration and d'amortissement d'une coque cylindrique generale a plusieurs couches, composee d'un nombre arbitraire de couches viscoelastiques and elastiques d'Un materiau orthotrope, avec des conditions de simple supportage aux extremites.
Abstract: La premiere partie a presente la solution de l'analyse de vibration et d'amortissement d'une coque cylindrique generale a plusieurs couches, composee d'un nombre arbitraire de couches viscoelastiques et elastiques d'un materiau orthotrope, avec des conditions de simple supportage aux extremites. La solution a ete programmee sur ordinateur IBM 360 pour l'evaluation des frequences de resonance et les facteurs de perte associes pour toutes les familles de modes ayant les vibrations axisymetriques et non axisymetriques de l'enveloppe multicouches. Le cas d'enveloppes a 3, 5, et 7 couches alternativement elastiques et viscoelastiques a ete examine
51 citations
TL;DR: In this paper, Afzal et al. showed that the velocity in the intermediate layer is of the order of unity, where 0 (U c) > 0 ( UT ) and that the classical logarithmic region always exists, provided Uc is judiciously selected.
Abstract: ONG and Chen,1 Afzal,2'3 and Afzal and Bush4 have reported the intermediate layer theory for turbulent shear flows. The velocity in the intermediate (meso) layer, as postulated by Long and Chen,1 is of the order of the friction velocity. The inner and intermediate layers in the mesolayer theory1 were regarded as a composite expansion that was matched with the outer defect layer. Their theory showed that for a boundary layer the logarithmic region was absent and that for a pipe flow the effect of the mesolayer was weak, although it did tend to modify the classical logarithmic behavior. In contrast to Long and Chen, Afzal2'3 has shown that the velocity in the intermediate layer is of the order of unity. Afzal's theory2'3 dealt separately with three (inner, intermediate, and outer) layers that were matched in the two overlap domains to show the possibility of two logarithmic regions rather than the one proposed by classical theory. Afzal2'3 and Afzal and Bush4 have shown that, in terms of classical theory, there is a distinct intermediate limit between the outer defect layer and the inner wall layer. This (new) three-layer theory modifies and/or extends the (old) two-layer theory. The implications of turbulent modeling by eddy viscosity and mixing length have been studied by Afzal and Bush.4 The aim of this Note is to modify Long and Chen's mesolayer theory in the light of Afzal's proposition2'3 that the velocity in the intermediate layer is of the order of C/ c, where 0 ( U c) >0 ( UT ). On the basis of the above stated proposition, a composite expansion for the inner and intermediate layer is formulated. The composite expansion is matched with the outer defect layer to show that the classical logarithmic region always exists, provided Uc is judiciously selected. It is further shown that the intermediate layer, when analyzed in terms of the two-layer classical theory, plays an insignificant role as far as the lowest-order results are concerned. However, this intermediate layer plays a significant role in the first-order theory where a three-layer picture of the flow is required.
36 citations
01 Jan 1984
TL;DR: The ethanolie extract of Salvia haematodes Wall, root showed significant analgesic activity as evident from an increase in reaction time to heat stimulus and exhibited protection against supramaximal electroshock seizures in mice.
Abstract: The effect of the ethanolie extract of Salvia haematodes Wall, root was studied on the central nervous system. Spontaneous motor activity was decreased significantly in mice. Pentobarbitone-induced narcosis was markedly potentiated and amphetamine-induced excitation in rats was antagonized. The extract showed significant analgesic activity as evident from an increase in reaction time to heat stimulus. The extract exhibited protection against supramaximal electroshock seizures in mice. There was a significant increase in hypoxic survival time of mice. The rectal temperature of rats registered a significant fall. The oral LD50 was found to be 2.3 g/kg body weight.
31 citations
TL;DR: The physico-chemical properties of effluent from Mohan Meakin Breweries Ltd, Ghaziabad, UP, India have been determined, and its effects, directly on fertile soil and indirectly on wheat Triticum aestivum and pea Pisum sativum crops, have been studied.
28 citations
TL;DR: In this paper, the infrared spectra of ten double sulphates, viz., M′ 2 M″(SO 4 ) 2 6H 2 O (M′ NH 4 /K), have been recorded in the 1300-400 cm −1 region.
TL;DR: A new isoflavone, 5,7-dihydroxy-6,2′-dimethoxyis oflavone together with iristectorigenin A and iristsectorin A were isolated and characterized from the methanol extract of Iris spuria.
TL;DR: The physico-chemical characteristics of Glaxo Laboratories (India) Ltd effluent (GLLE), and the effects of its discharge directly on fertile soil and indirectly on kidney bean Phaseolus aureus and pearl millet Pennisetum typhoides crops for 6 weeks, were evaluated.
TL;DR: In this article, fast-neutron radiative capture cross-sections have been measured relative to the 127 I(n, γ) 128 I reaction cross-section using the comparative activation technique for 160 Gd, 154 Sm and 51 V at five different neutron energies between 1 and 3 MeV.
TL;DR: Jangomolide, a novel limonoid has been isolated, together with limonin, from Flacourtia jangomas as discussed by the authors, which can be used to extract limonoids.
TL;DR: In this article, the adsorption behavior of metal ions in the formic acid-sodium formate system using unimpregnated as well as impregnated silica gel G as thin layers has been studied.
Abstract: The adsorption behavior of metal ions in the formic acid-sodium formate system using unimpregnated as well as impregnated silica gel G as thin layers has been studied A remarkable result of this study is the dramatic selectivity of impregnated silica gel G thin layers when compared to the corresponding unimpregnated silica gel G thin layers This impregnation effect provides us with a new adsorbent phase which is sufficiently stable in the formic acid-sodium formate medium Some important ternary separations have been achieved on silica gel G thin layers Al3+, Ni2+, Fe3+, and Pb2+ have been qualitatively separated from mixtures of other ions Cu2+ has been selectively separated on impregnated silica gel G thin layers The semi-quantitative determination of nine metal ions on impregnated silica gel G layers has also been attempted
TL;DR: In this paper, the authors established a fixed point theorem for three maps of a complete metric space, which is a generalization of that of Hardy and Rogers, and the commuting condition of Jungck is replaced by weakly commuting.
Abstract: The first result establishes a fixed point theorem for three maps of a complete metric space. The contractive definition is a generalization of that of Hardy and Rogers, and the commuting condition of Jungck is replaced by the concept of weakly commuting. The other results are extensions of some theorems of Kannan.
TL;DR: The physico-chemical characteristics of Ganges River water and distribution of nine metals in the submerged plant and fish has been studied in this paper, which showed that at various sampling stations deterioration in the quality of water at downstream is severe.
TL;DR: In this paper, the effect of various doses of gamma radiation on the ion exchange capacity, distribution coefficient values, elution behaviour, pH titration and infrared spectra of some thermally stable inorganic ion exchangers has been studied systematically.
Abstract: Effect of various doses of gamma radiation on the ion-exchange capacity, distribution coefficient values, elution behaviour, pH titration and infrared spectra of some thermally stable inorganic ion exchangers has been studied systematically. No change has been observed in the ion-exchange capacity, elution behaviour and the infrared spectra of the materials irradiated up to a total dose of 3·108 rad, while, a change has been observed in their pH-titration and distribution behaviour.
TL;DR: Conformational energy calculation and experimental results on refolding of proteins suggest that some proline residues are non-essential, which means that they will not block protein folding even in wrong isomeric form.
Abstract: The unfolding-refolding of proteins is a cooperative process and, as judged by equilibrium properties, occurs in one step involving the native,N, and the unfoldedU, conformational states. Kinetic studies have shown that the denatured protein exists as a mixture of slow-(U)Sand fast-(U)Frefolding forms produced by proline peptidecis-trans isomerization. Proline residues inUFare in the same configuration as in the native protein while they are in non-native configuration inUS. For protein folding to occur quicklyUSmust be converted intoUF. The fact that the equilibrium and kinetic properties of
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are the same as those found for prolinecis-trans isomerization taken together with the absence of slow phase in the kinetics of refolding of a protein devoid of proline, support this view. However, the absence of a linear correlation between half-time of reactivation of denatured enzymes and their proline-contents, as well as the dissimilarities in the kinetic properties of
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in unfolding and refolding experiments are not consistent with the model. Conformational energy calculation and experimental results on refolding of proteins suggest that some proline residues are non-essential. They will not block protein folding even in wrong isomeric form. The native-like folded structure with incorrect proline isomers will serve as intermediate state(s) in which these prolines will more readily isomerize to the correct isomeric form. The picture becomes more complex when one considers the consequence ofcis-trans isomerism of non-proline residues on protein folding.
TL;DR: In this article, the authors showed that BF3-etherate can produce 66% methyl 5-aza-nonadec-trans-2-enoate (4,5-d)-tetrazole (III), 10% methyl 4-oxo-trans -2-octadecenoate, and 7% pentadecamide (V).
Abstract: Methyl 4-oxo-trans-2-octadecenoate (II), when treated with excess hydrazoic acid in the presence of BF3-etherate, produced 66% methyl 5-aza-nonadec-trans-2-enoate (4,5-d)-tetrazole (III), 10% methyl 5-aza-nonadec-4-oxo-trans-2-enoate (IV) and 7% pentadecamide (V). Individual products were characterized by spectral and elemental methods.
TL;DR: In this paper, the optical and EPR data have shown the formation of NH 4 (PO 4 VO(H 2 O) 5 complex in the crystal as a result of VO 2+ doping.
TL;DR: It is shown that bovine serum albumin undergoes N-F transition in the neighbourhood of pH 4.0, and it is concluded that the separation of C-terminal region (from rest of bovin serumalbumin molecule) and/or its unfolding is responsible for the N- F transition in bovines serum albumIn.
Abstract: A fragment of bovine serum albumin corresponding to positions 1-385 of the protein sequence has been prepared by peptic digestion. Acid-induced conformational changes in the fragment as well as in the intact albumin have been studied by hydrodynamic and spectral methods. Special emphasis has been given to the pH zone, which is known to cause the N-F transition in bovine serum albumin. In agreement with earlier reports we have shown that bovine serum albumin undergoes N-F transition in the neighbourhood of pH 4.0. Our results on the fragment showed that it was unable to exhibit the N-F transition under identical experimental conditions. Since bovine serum albumin and the peptic fragment differ in that the latter lacks the C-terminal portion (i.e. residues 386-582) of its parent molecule, we conclude that the separation of C-terminal region (from rest of bovine serum albumin molecule) and/or its unfolding is responsible for the N-F transition in bovine serum albumin.
TL;DR: In this paper, the formation of clusters and their sizes in 50-GeV and 400-geV proton-nucleus interactions were investigated and the maximum multiplicity of charged shower particles constituting the clusters at the two incident energies was observed to be four.
Abstract: We have investigated the formation of clusters and their sizes in 50-GeV ..pi../sup -/-nucleus and 400-GeV proton-nucleus interactions. The maximum multiplicity of charged shower particles constituting the clusters at the two incident energies is observed to be four. Furthermore, the cluster size has been found to be independent of the gray-particle multiplicity and hence the target mass. The cluster size has also been observed to be independent of the energy and identity of the impinging hadrons.
TL;DR: Alkyl chain substituted oxathiolanes from allylic oxo are described in this article, where reaction of methyl 4oxo-trans-2-hexadecenoate (1) with β-mercaptoethanol yields methyl 4-oxathiolane-trans 2-hexadese cenate (II), methyl 4 -oxo -trans 2 -hexadesese ceneate (III) and methyl 4 −oxohexadecanoate (IV)
Abstract: Alkyl chain substituted oxathiolanes from allylic oxo are described. Reaction of methyl 4-oxo-trans-2-hexadecenoate (1) with β-mercaptoethanol yields methyl 4-oxathiolane-trans-2-hexadecenoate (II), methyl 4-oxathiolane-2(3)-(S-β-mercaptoethyl acetate) hexadecanoate (III) and methyl 4-oxathiolane-2(3)-(S-β-mercaptoethanol)hexadecanoate (IV).
TL;DR: A fatty acid, found as a minor component in the seed oil of Mirabilis jalapa, was shown to be the hitherto unknown 8-hydroxy octadeca-cis-11,14-dienoic acid as discussed by the authors.
TL;DR: In this paper, the authors measured neutron capture cross-sections at five different Neutron energies (1.07 ± 0.20, 1.48 ± 1.18, 2.30 ± 0.16 and 2.85 ± 0.,15 MeV) for the isomeric states of In and Rh.
TL;DR: The study suggests that cost-effective raw materials could be used for compounding nutritive feed for this species of catfish, which accepts and thrives well on pelleted feed.
TL;DR: Ceylantin, assigned the structure 7,8-dimethoxy-5,6-pyranocoumarin, and xanthotoxin have been isolated from the heartwood of Atalantia ceylanica.
TL;DR: Rizvi et al. as discussed by the authors studied the effect of N-methyl-N-nitrosourea (MeNu) and dimethyl sulphate (DimS) on the secondary structure of DNA.
Abstract: We have earlier reported that alkylation of DNA by the chemical carcinogen dimethyl sulphate, which mainly alkylates N-7 of guanine and N-3 of adenine, causes the formation of partially denatured regions in double-stranded DNA (Rizvi RY, Alvi NK & Hadi SM, Biosci. Rep.2, 315–322, 1982). It is known that the major site of alkylation in DNA by N-ethyl-N-nitrosourea (EtNu) are the phosphate groups. N-methyl-N-nitrosourea (MeNu), on the other hand, causes the alkylation of mainly guanine residues. We have therefore studied the effect of these two alkylating carcinogens on the secondary structure of DNA. DNA aikylated with increasing concentrations of EtNu and MeNu was subjected to alkaline and S1 nuclease hydrolysis. Thermal melting profiles of alkylated DNA were also determined using S1 nuclease. The results indicated that alkylation by the two alkylating agents had a differential effect on the secondary structure of DNA. EtNu-alkylated DNA was found to be more thermostable than native DNA at neutral pH. It was however more alkali-labile than MeNu-alkylated DNA. The greater stability of EtNu-alkylated DNA was considered to be due to abolition of negative charges on phosphate alkylation.