Showing papers by "Banaras Hindu University published in 1974"
01 Mar 1974
145 citations
TL;DR: In this article, a comparison of electronic absorption bands of Salicylaldehyde salicylhydrazone (SSH) and metal complexes showed the presence of ligand-metal charge transfer bands.
48 citations
TL;DR: Phylogenetic significance of the cooccurrence of erythrocentaurin and a number of structurally related monoterpene alkaloids in E. hyssopifolium is discussed and its natural occurrence was demonstrated by using a modified isolation procedure.
45 citations
TL;DR: The microanatomy of the skin of an air-breathing fish, Notopterus notopterus is described and related to the distribution of various histochemical constituents involved in keratinization, which is correlated with the peculiar mode of life of the fish, often facing the problems of desiccation.
Abstract: The microanatomy of the skin of an air-breathing fish, Notopterus notopterus is described and related to the distribution of various histochemical constituents involved in keratinization.
In addition to distinct unicellular mucous glands, secreting sulphated acid mucopolysaccharides, the epidermis of TV. notopterus is mainly composed of polygonal cells containing sulphated acid mucopolysaccharides, concentrated in the distal peripheral areas of the cells. The mucopolysaccharide contents of these polygonal cells gradually increase as they mature and move towards the outer surface. They may ultimately form a part of the protective keratinized layer.
The mature keratinized cells give positive reactions with Papanicolaou's stain, contain cystine bound SS groups, cysteine bound SH groups, calcium and moderate amounts of sulphated acid mucopolysaccharides. These cells having flat pyknotic nuclei undergoing karyolysis, are fused together at their lateral margins to form an intact sheet which is frequently seen sloughing off from the underlying epidermal cells.
The process of cornification in N. notopterus is comparable to that of the amphibians and the aquatic reptile–the turtle.
There exists a well developed lymphatic system in between the cells of the stratum germinativum having lymphatic spaces often penetrating deep into the middle layer. This is an adaptation which contributes largely to the protective function of the fish skin.
The layers between the scales and the basement membrane contain sulphated acid mucopolysaccharides. This together with keratinization has been correlated with the peculiar mode of life of the fish, often facing the problems of desiccation.
The epidermis is anchored on the dermis by fine strands of collagen fibres connecting the basement membrane and the scales, and by numerous fine papilla-like projections of the basement membrane projecting in between the cells of the stratum germinativum.
Numerous fine elastic fibres in the connective tissue pockets in which scales are lodged, provide for free movement of the scales when the body of the fish is bent during swimming.
Pit organs singly or in groups are found distributed in the epidermis.
43 citations
TL;DR: In this article, a trigonal unit cell belonging to the space group P¯3ml has been detected in a rapidly solidified aluminium-45 at. % copper alloy, where the unit cell dimensions area=4.106 and c=5.094 a.
Abstract: A new metastable intermediate phase having a trigonal unit cell belonging to the space groupP¯3ml has been detected in a rapidly solidified aluminium-45 at. % copper alloy. The unit cell dimensions area=4.106 andc=5.094 a. With five atoms per unit cell, the observed structure can be regarded as an isotype of Al3Ni2.
42 citations
TL;DR: In this article, a fresh X-ray study of liquisol-quenched gold-silicon alloys containing 16 and 25 at.% silicon was performed and the Debye-Scherrer reflections due to this new phase can be very satisfactorily indexed on the basis of a cubic (A13 or β-Mn-type) unit cell with 20 atoms and a = 6.750 A.
40 citations
TL;DR: In this paper, a non-linear relationship between ϵ J h and the particle Reynolds number has been found for fixed and fluidized beds, and the resulting expression is:.
38 citations
TL;DR: In this article, the crystal structure of the needle-shaped metastable β″ phase in an AlSiMg alloy has been studied by electron diffraction and the β″-phase structure has been found to be monoclinic (a = c = 6.16 A, b = 7.1 A, β = 82°).
Abstract: The crystal structure of the needle-shaped metastable β″ phase in an AlSiMg alloy has been studied by electron diffraction. Three different matrix orientations, [001], [101], and [112] were obtained using a tilt-rotation goniometer stage and checked with a computed stereographic projection. The β″-phase structure has been found to be monoclinic (a = c = 6.16 A, b = 7.1 A, β = 82°) in excellent confirmation to Schegoleva's X-ray analysis [6].
Die Kristallstruktur der nadelformigen, metastabilen β″-Phase in einer AlSiMg-Legierung wurde mittels Elektronenbeugung untersucht. Drei verschiedene Matrix-Orientierungen, [001], [101] und [112] konnten mit Hilfe des Kipp-Drehtisches eingestellt und mittels berechneter stereographischer Projektion gepruft werden. Die β″-Phase ergab sich als von monokliner Struktur (a = c = 6,16 A, b = 7,1 A, β = 82°) in ausgezeichneter Bestatigung von Schegolevas Rontgenuntersuchung [6].
32 citations
TL;DR: A new C 27 -steroidal sapogenin-peptide ester, fenugreekine, has been isolated from seeds of Trigonella foenum-graecum.
32 citations
TL;DR: The supernumerary chromosomes are late replicating and positively heteropycnotic during meiosis which characterize their heterochromatic nature and their G-banding patterns do not exactly resemble the patterns exhibited by the chromosomes of similar size and morphology of the normal complement.
Abstract: Supernumerary chromosomes have been observed in a few individuals of three subspecies of Rattus rattus from India and Nepal. The supernumerary chromosomes are late replicating and positively heteropycnotic during meiosis which characterize their heterochromatic nature. Their G-banding patterns do not exactly resemble the patterns exhibited by the chromosomes of similar size and morphology of the normal complement. The supernumerary chromosomes become conspicuous for the lack of a centromeric C-band in them as compared to the prominent C-bands in other chromosomes of the complement.
31 citations
TL;DR: In this article, the linear digital filtering technique developed for the computation of standard curves for conventional resistivity and electromagnetic depth soundings is applied to the determination of filter coefficients for the computations of dipole curves from the resistivity transform function by convolution.
Abstract: The technique of linear digital filtering developed for the computation of standard curves for conventional resistivity and electromagnetic depth soundings is applied to the determination of filter coefficients for the computation of dipole curves from the resistivity transform function by convolution. In designing the filter function from which the coefficients are derived, a sampling interval shorter than the one used in the earlier work on resistivity sounding is found to be necessary. The performance of the filter sets is tested and found to be highly accurate. The method is also simple and very fast in application.
TL;DR: The pharmacological profile of activities of these compounds indicated that the curative properties ascribed to the plant extracts, in the Indian system of medicine, are essentially due to the xanthone-O-glucosides.
TL;DR: In this paper, the properties of zinc, cadmium, and mercury complexes with 2-, 3- and 4-cyanopyridines have been characterized by molecular conductance and infrared spectral measurements down to 200 cm −1.
TL;DR: The working hypothesis is that the popu lations which exploit a greater variety of ecological niches in the territory which they inhabit, are more polymorphic than the populations restricted to a narrow range of ecological opportunities.
Abstract: Although the major morphological polymorphism is rare in the genus Drosophila, the chromosomal polymorphism is very common. The chromosomal variability is mainly due to inverted sections in the chromosomes. The degree of chromosomal variability differs in different species of Drosophila and within the species in different populations. It has been shown by several authors that inversion polymorphism is adaptive (for review see da Cunha 1960). Dobzhansky et al. (1950) and da Cunha et al. (1950) studied the natural populations of Drosophila willistoni in Brazil and reported that the mean number of heterozygous inversions per individual varies in different populations. To account for such findings they advanced the working hypothesis that the popu lations which exploit a greater variety of ecological niches in the territory which they inhabit, are more polymorphic than the populations restricted to a narrow range of ecological opportunities. This hypothesis has been tested further by several workers and the results obtained tend to support it (da Cunha et al. 1953, da Cunha and Dobzhansky 1954, Carson 1955, Salzano 1955, da Cunha et al. 1959). There are, however, a number of exceptions to the above ecological niche hypothesis. A prominent exception is the presence of a very low degree of chromosomal polymorphism in most of the cosmopolitan species of the genus Drosophila (Carson 1955). Drosophila ananassae, although a cosmopolitan and domestic species, shows a high degree of chromosomal polymorphism (Kaufmann 1936, Kikkawa 1938, Dobzhansky and Dreyfus 1943, Shirai and Moriwaki 1952, Freire-Maia 1955, 1961, Seecof 1957, Futch 1966, Ray-Chaudhuri and Jha 1966).
TL;DR: In this article, the resistivity-thickness curve in Gd films was observed to decrease with decreasing thickness, and it was suggested that this curious resistivity characteristic of Gd film results from the thickness dependences of the structural phase and of the spin-disorder resistivity.
TL;DR: In pulse-labelled muntjac chromosomes, segmental labelling corresponding to the large blocks of G-bands was observed during late S; the termination sequence of DNA synthesis was light bands → C-bands → G- bands.
01 Jan 1974
TL;DR: From an appraisal of phytosociological and of fumigation investigations, it is apparent that bryophytes can be successfully used for preparing pollution maps of urban and industrial areas as well as for indicating the presence of contaminated environments.
Abstract: SummaryThe literature on bryophytes in relation to some major air pollutants, such as sulfur dioxide, hydrogen fluoride, ozone, radioactive isotopes and heavy metals, has been reviewed to assess the reliability of these organisms as bioindicators of contaminated environments. The effects of these pollutants on the life processes of bryophytes, in consonance to their ecological diversity, habitat and growth form, have been discussed. The symptoms of injury as exhibited by the external and internal necrosis of plant tissues and by the retardation or cessation of metabolic processes, such as photosynthesis, respiration, growth and reproduction, clearly demonstrate the extreme sensitivity of bryophytes, especially the epiphytic ones, to the gaseous air pollutants. From an appraisal of phytosociological and of fumigation investigations, it is apparent that bryophytes, singly or collectively, can be successfully used for preparing pollution maps of urban and industrial areas as well as for indicating the presen...
TL;DR: In this article, a linear digital filtering technique was used for the direct interpretation of the resistivity transform function from field dipole measurements as the first step in directly interpreting dipole data.
Abstract: The technique of linear digital filtering as developed for the direct interpretation of Schlumberger and Wenner soundings (Ghosh 1971) has been applied here for the derivation of the resistivity transform function from the field dipole measurements as the first step in directly interpreting dipole data. Filter coefficients for this transformation have been worked out for the radial-polar, perpendicular and parallel (30°) arrays of dipole sounding. The procedure combines speed with accuracy.
TL;DR: Chinensin, a 1-aryl-2,3-naphthalide lignan, was isolated from Polyqala chinensis as mentioned in this paper, and chemical transformation and UV, IR, PMR and MS evidence established its structure as 6,7-methylenedioxv-]-(3′,4′-dimethoxyphenyl)-3-hydroxymethylnaphthylene-2-carboxylic acid lactone.
TL;DR: A “thyroid-sensitive” hypothalamo/hypophyseal/gonadal axis, as exhibited by this bird and many other birds of mid and low latitudes where the degree of insolation is large, may serve as a safety mechanism against unseasonal gonadal growth and hence might be of adaptive significance in tropical photoperiodic finches.
TL;DR: Using the Ziman scheme of considering a drifting Planck's distribution, as the eigenvector of the linearized phonon collision operator, the anharmonic relaxation of phonons is discussed in this article.
Abstract: Using the Ziman scheme of considering a drifting Planck’s distribution, as the eigenvector of the linearized phonon collision operator, the anharmonic relaxation of phonons is discussed. The earlier arbitrariness in the phonon-phonon coupling parameters is removed by formulating explicit expressions for different allowed processes in terms of measurable quantities. Low and high temperature approximations of relaxation rates are also discussed: the results differ from earlier calculations. At low temperatures superthermal or high frequency phonons, which have temperature-independent and equal N- and U-relaxation rates, play important roles in thermal conduction in pure insulators.
TL;DR: A characteristic “avian pattern” of thyroidal radioiodine retention was observed, which appeared to be due to a rapid turnover, as evident from a high uptake, rapid thyroxinogenesis, and release of hormone into blood.
TL;DR: Hydrocortisone-mediated induction of mitochondrial and cytoplasmic isozymes of alanine aminotransferase of the liver of immature, adult and old adrenalectomised rats was studied and cAAT is induced throughout the life span, but the degree of its induction in the old is considerably less than in the adult.
TL;DR: Chinensinaphthol and chinensinaphihol methyl ether, two new 1-ary]-2,3-naphthalide lignans, have been isolated from the title plant as discussed by the authors.
TL;DR: In this paper, a theoretical analysis of the lattice vibrations in alkaline earth oxides (CaO and SrO) has been carried out by means of a three-body force shell model which considers the ionic charge Z as an independent parameter and both the ions polarizable.
TL;DR: Observations indicate that an inhibitor controls the spacing of heterocysts in Anabaena cylindrica, probably involving some inhibitory substance produced by the heterocyst itself.
Abstract: THE blue-green alga Cylindrospermum, unlike a similar alga, Anabaena, where intercalary heterocysts are present, contains only two terminal heterocysts (Fig. 1A). When either or both the heterocysts are detached, new heterocysts regenerate in time. In Anabaena cylindrica, where the heterocysts occur at regular intervals, the spacing pattern is determined by intercellular interactions, probably involving some inhibitory substance produced by the heterocyst itself. No two heterocysts are produced side by side either in Anabaena or Cylindrospermum. The inhibitory substance could be ammonia or a substance derived from ammonia1. Here we report observations which indicate that an inhibitor controls the spacing of heterocysts.
TL;DR: In this article, the mean atomic volume in the Zr-Pt system along with x-ray diffraction data on space group, lattice constants, and atomic parameters for Zr/sub 9/Pt/sub 11/ phase were presented.
Abstract: Data on the mean atomic volume in the Zr--Pt system are presented along with x-ray diffraction data on space group, lattice constants, and atomic parameters for the Zr/sub 9/Pt/sub 11/ phase. It is noted that while data on the parameters need refinement, the structure of Zr/sub 9/Pt/sub 11/, based on these data is a variant of a bcc lattice. (JRD)
TL;DR: In this paper, the effective interaction within the transition metals is split into the central interaction between the ions and the ion-electron interaction, which is accounted for by taking central forces up to fourth neighbours in Ti and Hf and up to the fifth neighbour in Y.
Abstract: The effective interaction within the transition metals is split into the central interaction between the ions and the ion-electron interaction. The former contribution is accounted for by taking central forces up to fourth neighbours in Ti and Hf and up to the fifth neighbour in Y. The latter contribution is, however, obtained following Bhatia's method on cubic metals. Phonon dispersion relations along symmetry directions and theta -T curve have been plotted and compared with the available experimental results.