Showing papers by "Indian Institute of Science published in 1976"
TL;DR: Kalidasa in Vikramorvasiyam (c. 300 A.D) as mentioned in this paper was transformed into a vine clinging to a tree at the boundary of the sacred ground of Kumara.
Abstract: Then ignoring the pleadings of the king, she wandered into the sacred grove of Kumara. Her mind bewildered by the curse of her Guru, she failed to notice this transgression into an area forbidden to women. No sooner did she enter, than she was transformed into a vine clinging to a tree at the boundary of the grove. Kalidasa in Vikramorvasiyam (c. 300 A.D.)
216 citations
TL;DR: It follows that even with non-prolyl residues, cis peptide units are not forbidden, but can occur in some rare examples and should be looked for.
187 citations
TL;DR: In this paper, a method to disperse oxide particles (primarily alumina) in the matrix of aluminium alloys, involving additions of particles to alloy melts prior to the solidification of castings, is described.
106 citations
TL;DR: In this article, the connection between Nambu's generalization of classical dynamics and conventional Hamiltonian ideas is explored, in particular, the possibility of embedding the dynamics of a nambu triplet in a four-dimensional canonical phase space formalism is proved.
Abstract: The connection between Nambu's generalization of classical dynamics and conventional Hamiltonian ideas is explored. In particular, the possibility of embedding the dynamics of a Nambu triplet in a four-dimensional canonical phase-space formalism is proved.
76 citations
TL;DR: In this paper, a new model for the aether is suggested according to which it is a superfluid state of fermion and antifermion pairs, describable by a macroscopic wave function.
Abstract: A new model for the aether is suggested according to which it is a superfluid state of fermion and antifermion pairs, describable by a macroscopic wave function. The vacuum state of this superfluid pervades the entire universe and may account for the missing matter. The visible matter in the universe appears as excitations from the underlying superfluid vacuum.
57 citations
TL;DR: CoTE, administered subcutaneously, both in multiple doses and as a single injection, was found to be equally effective, and the active factor is a heat-stable, lyophilizable, nondialyzable material, free of contamination by testosterone and probably by other steroids.
Abstract: We report here a sensitive model for studying inhibin-like activity in crude ovine testicular extracts (CoTE) The administration of CoTE in 25-100 mg amounts to 35-day-old immature male rats, orchidectomized just prior to use, resulted in the prevention of a rise in plasma FSH levels, seen 10 h post-treatment In a second model, CoTE was injected at 1000 h of day 35 to a group of rats that was castrated 12-24 h prior to injection, and the animals were sacrificed 6 h later; plasma FSH levels were found to be significantly suppressed CoTE, administered subcutaneously, both in multiple doses and as a single injection, was found to be equally effective A single injection suppressed FSH levels within 3-6 h while LH levels were unaffected The suppressive effect was dose-dependent, reaching a maximum value at doses of 100 mg CoTE and above FSH levels could not be suppressed below the tonic level, either by the administration of a single large dose of CoTE, or by repetitive injections of maximal doses of CoTE at 3 h intervals The suppression in FSH levels caused by a single injection of CoTE waned with time and totally disappeared by 36h CoTE was prepared by the heat treatment (55 C for 30 min) of an aqueous extract of ovine testis, followed by centrifugation and ether extraction of the supernatant The aqueous layer was then dialyzed and lyophilized The lyophilized material was found to be free of testosterone, as measured by a specific radioimmunoassay, indicating that the active factor is a heat-stable, lyophilizable, nondialyzable material, free of contamination by testosterone and probably by other steroids
56 citations
TL;DR: In this paper, the authors investigated the thermal decomposition of barium titanyl oxalate tetrahydrate (BTO) using TGA, DTG and DTA techniques and gas and chemical analysis.
48 citations
TL;DR: The conformance between the linings and rings of an internal combustion engine depends mainly on their linear wear (dimensional loss) during running-in this paper, which is due to phase changes in the cast iron accompanied by dimensional growth at higher thermal loads.
44 citations
TL;DR: It was concluded that the energy transfer did not occur with equal efficiency under all conditions and that the tryptophan residues responsible for the riboflavin binding are more accessible to N-bromosuccinimide oxidation than others.
44 citations
TL;DR: In this article, a constant-pressure axisymmetric turbulent boundary layer along a circular cylinder of radius a is studied at large values of the frictional Reynolds number a+ (based upon a) with the boundary-layer thickness δ of order a. The condition that the two expansions match requires the existence, at the lowest order, of a log region in the usual two-dimensional co-ordinates (u+, y+).
Abstract: A constant-pressure axisymmetric turbulent boundary layer along a circular cylinder of radius a is studied at large values of the frictional Reynolds number a+ (based upon a) with the boundary-layer thickness δ of order a. Using the equations of mean motion and the method of matched asymptotic expansions, it is shown that the flow can be described by the same two limit processes (inner and outer) as are used in two-dimensional flow. The condition that the two expansions match requires the existence, at the lowest order, of a log region in the usual two-dimensional co-ordinates (u+, y+). Examination of available experimental data shows that substantial log regions do in fact exist but that the intercept is possibly not a universal constant. Similarly, the solution in the outer layer leads to a defect law of the same form as in two-dimensional flow; experiment shows that the intercept in the defect law depends on δ/a. It is concluded that, except in those extreme situations where a+ is small (in which case the boundary layer may not anyway be in a fully developed turbulent state), the simplest analysis of axisymmetric flow will be to use the two-dimensional laws with parameters that now depend on a+ or δ/a as appropriate.
43 citations
TL;DR: Using the lactating monkey, a similar inhibitory effect of prolactin on pituitary responsiveness to LHRH is demonstrated, suggesting a mechanism by which amenorrhoeic conditions are maintained during lactation.
Abstract: STUDIES with rats have shown that during lactation there is an inhibition of luteinising hormone (LH)-dependent physiological events, such as implantation1, and a return to oestrus cyclicity2. This inhibition has been shown to occur only during the intense suckling phase and it has been correlated with the high levels of prolactin present in the circulation at this time. Although exogenous prolactin could substitute for the effects of intense suckling, it could do so only under the permissive influence of minimal suckling stimulus. We have shown that there is, in these conditions, a lowering of LH levels, and that this is due to interference by prolactin with the pituitary responsiveness to LH-releasing hormone (LHRH) (K. Muralidhar, R. M. and N. R. M., unpublished). Using the lactating monkey, we have now demonstrated a similar inhibitory effect of prolactin on pituitary responsiveness to LHRH, suggesting a mechanism by which amenorrhoeic conditions are maintained during lactation.
TL;DR: The transition temperature of the hadronic superfluid during the hadron era is estimated to be 10 − 13 K, which is the same as the Hagedorn temperature, giving a physical basis of the thermodynamic bootstrap model as mentioned in this paper.
Abstract: Some cosmological consequences of the superfluid vacuum state developed previously by the authors are discussed, particularly with regard to the initial stages of the universe. The transition temperature of the hadronic superfluid (superfluid during the hadron era) is estimated to be 10
13
K, which is the same as the Hagedorn temperature, giving a physical basis of the thermodynamic bootstrap model.
TL;DR: In this article, the damping capacity of cast graphitic aluminum alloy composites has been measured using a torsion pendulum at a constant strain amplitude, and it was found that flake-graphite particles dispersed in the matrix of aluminum alloys increased damping performance.
TL;DR: A diamine oxidase has been purified from 5-day old etiolated seedlings of L. sativus by MnCl2 treatment, (NH4)2SO4 and Me2CO fractionations, positive adsorption on alumina Cγ-gel followed by column chromatography on DEAE-Sephadex.
TL;DR: In this article, a general iterative perturbation technique has been evolved for pattern synthesis for the case when the antenna currents alone are varied as web as well as when both antenna currents and the element positions are simultaneously varied.
Abstract: Synthesis of antenna arrays employing the L_{2} -norm as well as the L_{\infty} -norm is discussed. The approximation in the L_{\infty} -norm is obtained making use of Lawson's algorithm. A general iterative perturbation technique has been evolved for pattern synthesis for the case when the antenna currents alone are varied as web as for the case when both the antenna currents and the element positions are simultaneously varied. A few illustrative examples are given. The convergence of the iteration and the uniqueness of the solution are discussed.
TL;DR: Deutsch's Thinning algorithm (rectangular array) is used for thinning the digitized fingerprint (binary version) and a simple algorithm is also suggested for classifying the fingerprints.
TL;DR: Candida spp.
Abstract: Candida spp. grown in synthetic medium supplemented with l-tryptophan as sole nitrogen source produced beta-indoleethanol (beta-IEA) and beta-indolelactic acid (beta-ILA). These compounds isolated from the culture filtrates were characterized by ultraviolet, infrared, and nuclear magnetic resonance spectral studies. Using dl-[(3)H]trypotophan in the medium, labeled beta-IEA and beta-ILA were isolated. Further, beta-IEA was produced as a result incubating log-phase cells of C. albicans with beta-ILA. Both beta-IEA and beta-ILA inhibited the growth of gram-positive and -negative bacteria. Autoantibiotic action of these compounds on Candida spp. and the reversal of this inhibition were studied.
TL;DR: RNA polymerase of M. tuberculosis is a thousand-fold more sensitive to rifampicin, a potent antitubercular drug than the E. coli RNA polymerase, probably because of the difference in the beta subunits.
TL;DR: Dihydrofolate reductase from soybean seedlings has been purified by agarose-formylaminopterin affinity chromatography and is homogeneous as judged by disc gel electrophoresis and immunodiffusion.
TL;DR: In this paper, a compression ignition engine's cylinder linings are smoothed during running-in by removing loose wear particles from the sliding region during the primary run-in period.
TL;DR: From a study of the effects of constant light on serum testosterone in the male bonnet monkey (Macaca radiata), it is found that M. radiata shows a nychthemeral variation in serum testosterone.
Abstract: CIRCADIAN and seasonal variations in reproductive functions of mammals have been investigated extensively1 Serum testosterone exhibits a nychthemeral variation in man2–6 and the rhesus monkey7,8 Exposure of laboratory rodents which are nocturnal in habit to continuous illumination causes precocious puberty in immature rats and hamsters9, and constant oestrus in cycling rats due to elevated gonadotropins10 Conversely, prolonged exposure to darkness causes atrophy of testes in the hamster due to suppression of circulating FSH and LH11,12 Relatively less information is available on the effects of light on reproduction in the human and non-human primates From a study of the effects of constant light on serum testosterone in the male bonnet monkey (Macaca radiata), we have found that M radiata shows a nychthemeral variation in serum testosterone
TL;DR: It is found that, while (Gly‐Pro‐Sar)n exists in ordered triple‐helical conformation, (Gsar‐Pro)n remains as a disordered random coil in water.
Abstract: Our studies on the solution conformation of $(Gly-Pro-Sar)_n$ and $(Gly-Sar-Pro)_n$ synthesized as polypeptide models for collagen are reported. It is found that, while $(Gly-Pro-Sar)_n$ exists in ordered triple-helical conformation, $(Gly-Sar-Pro)_n$ remains as a disordered random coil in water. Addition of certain helix-promoting solvents seems to generate order in $(Gly-Sar-Pro)_n$.
TL;DR: In this article, the thermal decomposition of lead titanyl oxalate tetrahydrate (LTO) has been investigated employing thermoanalytical and gas analysis techniques, and a mixture of lead metatitanate and titanium rich PbTi3O7 was obtained.
TL;DR: In this paper, the authors tried to locate possible reasons for the divergence in the reported activation energy values and found that the activation energies are independent of the atmosphere in which the degradation of polymer fuel is carried out.
Abstract: The importance of the study of thermal degradation of polymeric fuels arises from their role in the combustion of solid propellants. Estimation of the condensed-phase heat release during combustion can be facilitated by the knowledge of the enthalpy change associated with the polymer degradation process. Differential scanning calorimetry has been used to obtain enthalpy data. Kinetic studies on the polymeric degradation process have been carried out with the following objectives. The literature values of activation energies are quite diverse and differ from author to author. The present study has tried to locate possible reasons for the divergence in the reported activation energy values. A value of 30 kcal has been obtained and found to be independent of the technique employed. The present data on the kinetics support to chain-end initiation and unzipping process. The activation energies are further found to be independent of the atmosphere in which the degradation of polymer fuel is carried out. The degradation in air, N2, and O2 all yield a value of 30 kcal/mole for the activation energies.
TL;DR: Acetylcholinesterase (AChE) from Pisum sativum purified 28 fold showed two closely moving protein bands on polyacrylamide gel electrophoresis, both of which have AChE activity.
01 Jan 1976
TL;DR: In this article, steady state ionisation currents under uniform field conditions have been measured in SF6 over the range 110 ≤E/p≤1000V cm−1torr−1 with gas pressures varying from 1 to 10 torr, at 20°C.
Abstract: Steady-state ionisation currents under uniform field conditions have been measured in SF6 over the range 110 ≤E/p≤1000V cm−1torr−1 with gas pressures varying from 1 to 10 torr, at 20°C. Sparking potentials Vs were also measured for a range 1≤pd≤20 torr-cm. Townsend's primary ionisation (α/p) and electron-attachment (η/p) coefficients were found to depend on E/p only. The values of secondary-ionisation coefficient (γ) were also determined over the range 140≤E/p≤600 V cm−1 torr−1. Measurements of Vs of SF6 have shown that the deviations from Paschen's law rise up to ±3.5% at values of pd near the Paschen minimum.
TL;DR: It is concluded that feeding of lipids containing polyunsaturated fatty acids effects an increase in the unsaturation of the biliary phospholipids and thereby causes increased excretion of cholesterol through the bile.
TL;DR: The strong f-gravity metric with Dirac's atomic metric and the large value of its coupling constant, i.e. G f ∼ 10 39 G N (G N being Newtonian constant) provides the physical basis for the large numbers hypothesis.
TL;DR: A general analysis of symmetries and constraints for singular Lagrangian systems is given in this article, where it is shown that symmetry transformations can be expressed as canonical transformations in phase space, even for such systems.
TL;DR: Tetrodotoxin has been shown to inhibit Li+-, Na+ - and K- induced fluorescence enhancements of 1-aniline-8-napthalene sulfonate bound to brain membranes.