Showing papers by "Banaras Hindu University published in 1988"
TL;DR: In this paper, the removal of As(III) from aqueous solutions at different concentrations, pH and temperatures by haematite has been carried out successfully and the maximum removal was found to be 96 % at concentration 13.34 μmol L−1, temperature 20 °C and pH 7.0.
Abstract: The removal of As(III) from aqueous solutions at different concentrations, pH and temperatures by haematite has been carried out successfully. The maximum removal was found to be 96 % at concentration 13.34 μmol L−1, temperature 20 °C and pH 7.0. The process of uptake follows first-order adsorption rate expression and obeys the Langmuir's model of adsorption. The removal of As(III) by haematite is also partially diffusion controlled and mass transfer coefficients, diffusion coefficients and thermodynamic parameters have been determined to explain the results.
159 citations
TL;DR: In this article, the ability of fly ash to remove Omega Chrome Red ME (a chrome dye, mostly used in textile industries) from water has been studied, and it has been found that low adsorbate concentration, small particle size of adsorbent, low temperature, and acidic pH of the medium favor the removal of chrome dye from aqueous solutions.
Abstract: The ability of fly ash to remove Omega Chrome Red ME (a chrome dye, mostly used in textile industries) from water has been studied. It has been found that low adsorbate concentration, small particle size of adsorbent, low temperature, and acidic pH of the medium favor the removal of chrome dye from aqueous solutions. The dynamics of adsorbate transport from bulk to the solid phase has been studied at different temperatures in light of the adsorption of dye on the outer surface as well as diffusion within the pores of fly ash. The applicability of Langmuir isotherm suggests the formation of monolayer coverage of dye molecules on the outer interface of adsorbent. The thermodynamics of chrome dye-fly ash system indicates spontaneous and exothermic nature of the process. The pronounced removal of chrome dye in the acidic range may be due to the association of dye anions with the positively charged surface of the adsorbent.
123 citations
TL;DR: In this paper, microbial biomass C and P were measured for six tropical soils and the two were linearly related with the soil biomass having a mean P concentration of 3.5% and the amount of biomass P was positively related with NaHCO3-extraclable soil inorganic P.
Abstract: Microbial biomass C and P were measured for six tropical soils. Biomass C ranged from 149 to 667 μg g−1 soil and biomass P from 17 to 35 μg g−1 soil and the two were linearly related with the soil biomass having a mean P concentration of 3.5%. Soil biomass accounted for 2.5–5.6% of total soil organic C and 9.2–19.2% of the total soil organic P. The amount of biomass P was positively related with NaHCO3-extraclable soil inorganic P. P concentration in biomass on the other hand exhibited an inverse relationship with NaHCO3-extractable soil Pi.
105 citations
TL;DR: In this paper, the authors used china clay as an adsorbent for removal of fluoride from water at different concentrations, temperatures and pH, and investigated the kinetics of adsorption and isotherms at different temperatures for the present system.
92 citations
88 citations
TL;DR: In this article, the number of mobile ionic species in some proton conductors and their mobility was evaluated by using a transient ionic current measurement technique, which was used on the Proton Conductors of N 2 H 6 SO 4, N 2H 6 Cl 2, (NH 4 ) 10 W 12 O 41 ·5H 2 O and MoO 3 ·2H 2O.
85 citations
TL;DR: Squamocin, a new trihydroxy-bis-tetrahydrofuran fatty acid γ-lactone (acetogenin), has been isolated from Annona squamosa L.(Annonaceae) and its structure has been elucidated on the basis of spectral evidence and chemical degradations.
Abstract: Squamocin, a new trihydroxy-bis-tetrahydrofuran fatty acid γ-lactone (acetogenin), has been isolated from Annona squamosa L(Annonaceae) and its structure has been elucidated on the basis of spectral evidence and chemical degradations
82 citations
TL;DR: Shoots obtained from the proliferation stage were rooted on half-strength MS medium containing indole-3-butyric acid and α-naphthaleneacetic acid and Regenerated plantlets were successfully established in soil under field conditions.
68 citations
TL;DR: In this paper, a method of degradation of coumarino-lignans for the identification of the coumarin moiety has been developed, which is used in this paper.
53 citations
TL;DR: In this paper, the fracture toughness and fracture surface energy of fiber reinforced plastic (FRP) composites were evaluated by the ultrasonic method. And the results showed that a fly-ash particle can arrest the crack path and thus improve the fracture properties of fibre reinforced plastic composites, and the results have further significance in view of the fact that flyash powder is far cheaper than carbon fibre, glass fibre and epoxy resin.
52 citations
TL;DR: In this article, an incompressible viscous fluid between two vertical parallel plates is considered for impulsive start of one of the plates, and the Laplace transform technique is used to obtain the velocity and temperature fields and their related quantities.
Abstract: Unsteady free convective flow of an incompressible viscous fluid between two vertical parallel plates is considered for impulsive start of one of the plates. Expressions for velocity and temperature fields and their related quantities are obtained by the Laplace transform technique. The effect of Grashof number is to increase the velocity of both air and water and to decrease the skin-friction of these fluids.
TL;DR: The results suggest that carbofuran is capable of inducing histopathological and biochemical alterations in liver which may cause physiometabolic dysfunction in this species.
TL;DR: The MCB‐induced changes in the mucosa provided resistance against the effect of ulcerogens and also against shedding of mucosal cells.
Abstract: Fulvic acids (FA) and 4′-methoxy-6-carbomethoxybiphenyl (MCB, 1), two major organic compounds isolated from Shilajit (a humus product), were screened for anti-ulcerogenic activity in albino rats. Both FA and MCB showed significant anti-ulerogenic effects in the battery of tests accepted for this purpose. The mechanism of anti-ulcerogenic action was studied with MCB on the basis of its effects on mucin content (gastric juice carbohydrates and carbohydrate/protein ratio) and on the concentration of DNA and protein in the gastric juice. The MCB-induced changes in the mucosa provided resistance against the effect of ulcerogens and also against shedding of mucosal cells. A preliminary acute toxicity study indicated that both FA and MCB had a low order of toxicity.
TL;DR: Findings indicate that one of the constituents of Inula racemosa may have adrenergic beta-blocking activity and showed negative inotropic and negative chronotropic effects on frog heart.
TL;DR: The developmental stages of 142 alpine plant species were observed during 1984/85 in the grassland site of Rudranath bughiyal (30°28′N, 79°20′E; 3250 to 4200 m) in the Central Himalayan region.
Abstract: The developmental stages of 142 alpine plant species were observed during 1984/85 in the grassland site of Rudranath bughiyal (30°28′N, 79°20′E; 3250 to 4200 m) in the Central Himalayan region. The...
TL;DR: In this paper, the similarity solution for hydromagnetic flow of an incompressible viscous electrically conducting fluid past a continuously moving semi-infinite porous plate in the presence of a magnetic field has been obtained for the case of small magnetic Reynolds number.
Abstract: The similarity solution for hydromagnetic flow of an incompressible viscous electrically conducting fluid past a continuously moving semi-infinite porous plate in the presence of a magnetic field has been obtained for the case of small magnetic Reynolds number. The perturbation method has been used to solve the similarity equations at large suction. The resulting equations have been solved by analytical method. The effect of the magnetic parameter is to increase the skin-friction coefficient while it has no significant effect on the Nusselt number.
TL;DR: Exposure of the catfish to toxicologically safe concentrations of the mercurials for 90 days caused vacuolation, atrophy, and extensive damage of the tubules in HgCl2-and CH3HgCl-treated fish, and hypertrophy and vacUolation of epithelial cells of some tubule in the emisan 6- treated fish.
TL;DR: Toxic effects of mercurials on ovarian recrudescence in the catfish, an economically important species in the sub- continent and a serlous environ- mental hazard is investigated.
Abstract: Mercury (Hg) is a ubiqultous i highly toxlc heavy metal whlch is bioconcentrated upthrough the food chaln. Des- pite out extensive knowledge of its tox8 to living organlsms and repeated incidences of Hg polsonlng,wide- spread contamination of Hg remains a serlous environ- mental hazard (Wren 1986). In India alone, about 180 tons of Hg are introduced into the environment every year (Chaudry 1980) which ultimately reach the aquatlc systems. In fishes Hg is accumulated in the form of methylmercury (World Health 0rganization 1976). Mercu- rial toxlcity in fishes has been focused mainly on t8 uptake and subcellular distribution (McKim et al. 197~; 01son et al.19?8); nephrotoxlcity (Trump et al. 1975){ development, hatching and survlvability of young ones (Armstrong 1979; Sharp and Neff 1980) and teratology (Wels and Weis 1977). Very few studies have been attem- pted to investigate Hg toxiclty on gonadal activity of fishes throughout the breeding season (Ram and Sathya- nesan 1983,1986). In a prevlous investigation we have studieoE the toxic effects of mercurlc chloride (HgCl2), methylmercurlc chloride (CH3HgC1) and emisan 6 (an alko- xyalkyl fungiclde) on the survival and histology of the kldney of the catfish, ~ batrachus (Kirubagaran and Joy 1988). The present report deals w8 toxic eff- ects of these mercurials on ovarian recrudescence in the catfish, an economically important species in the sub- continent. MATERIALS AND METHODS Forty adult female catfish welghing 60 +_ 5 g were coll- ected from Gangetlc riverine system in and around Vara- nasl. They were acclimated to laboratory conditions for 14 days before startlng the experiment. The fish were Send reprint requests to Dr.K.P.Joy at the above address. 992
01 Apr 1988-Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering
TL;DR: In this paper, the removal of Metomega Chrome Orange GL, a commercial textile dye from wastewaters has been found to be nearly 99% under the optimal conditions (i.e. 3.0 pH and 30°C temperature) using fly ash as an sorbent.
Abstract: The removal of Metomega Chrome Orange GL, a commercial textile dye from wastewaters has been found to be nearly 99% under the optimal conditions (i.e. 3.0 pH and 30°C temperature) using fly ash as an sorbent. The process follows a first order kinetics and the value of rate constant, Kad is of the order 3 x 10−2 min−1. Intraparticle diffusion and mass transfer coefficients have been determined at different temperatures. The sorption data fits well in the Langmuir isotherm model. The effect of temperature has been explained on the basis of boundary layer thickness, activation energy (Ea = ‐0.87 Cal mole−1) and enthalpy change (AH = ‐13.04 Cal mole−1) study. Heat of sorption has been found to be a function of surface coverage.
TL;DR: Two preemergence herbicides showed little effect on the photosynthetic oxygen evolution of Nostoc muscorum and Gloeocapsa sp.
TL;DR: In this paper, a general theory has been developed to account for the material conductivity losses on the performance characteristics of a helical slow-wave structure (SWS) traveling-wave tube (TWT).
Abstract: A general theory has been developed to account for the material conductivity losses on the performance characteristics of a helical slow-wave structure (SWS) traveling-wave tube (TWT). The effects of helix/envelope conductivity have been studied on various propagation parameters, namely, the axial propagation constant, the interaction impedance, the attenuation constant, and the equivalent circuit resistance per unit length of the structure. While with the first two of these parameters, these effects are found to be only of the second order, they are quite significant for the remaining two. The functional dependence of the propagation parameters on the other structure parameters of importance namely, the relative permittivity of the helix supports, the envelope-to-helix separation, the helix pitch angle, and the thickness of the helix wire, has also been shown. The generalized theory developed here has been further tested by comparing the results with those obtained elsewhere for some special cases. >
TL;DR: In this article, the correlation between trace elements and coal ash has been established by the coefficients of correlation between the trace element and ash present, and it is inferred that Ge, Cr, Y and La occur in these coals as organo-metallic complexes and chelates.
TL;DR: Results indicate that the pineal gland may be implicated in mediating the humdity information to control the male gonadal function in the Indian palm squirrel, Funambulus pennanti.
Abstract: The effect of two different conditions of humidity (80 +/- 5% and 40 +/- 5%) under stimulatory photoperiod (14L/10D) and high temperature (38 +/- 2 degrees C) was studied on the testes and accessory sex organs of the Indian palm squirrel, Funambulus pennanti, during the sexually active phase. High humidity (80 +/- 5%) reduced significantly the testes weight of the sham-operated animals as compared to the controls under natural environmental conditions but had no effect on that of pinealectomized animals. Moderate humidity (40 +/- 5%) did not affect the testes of sham-operated as well as pinealectomized animals, as compared to the respective controls. The seminal and prostatic weights showed no significant difference in high or moderate humidity conditions. However, the epididymal weight of the animals exposed to high humidity was significantly reduced in sham-operated animals only. Thus, these results indicate that the pineal gland may be implicated in mediating the humidity information to control the male gonadal function in the Indian palm squirrel, Funambulus pennanti.
TL;DR: This study clearly suggests that metal toxicity in N2-fixing cyanobacterium may be appreciably counteracted by reducing substances and amino acids which are likely to occur in natural habitats.
TL;DR: Malathion demonstrated a dose-dependent inhibition of brain AchE activity, whereas endosulfan caused no significant reduction of AchEActivity.
TL;DR: The properties of various fuzzy connectedness concepts are discussed and some of the properties are explained in more detail.
Journal Article•
TL;DR: The data suggest that spironolactone may be useful as antiandrogen in the short term therapy of acne vulgaris.
Abstract: In an open therapeutic trial, 50 patients with acne vulgaris were randomly allocated to one of two groups. One group received spironolactone 100 mg daily and the other cimetidine 1.6 g daily for 12 weeks. Clinical severity of acne and sebum excretion decreased significantly at the end of the trial with both drugs, but significantly more with spironolactone. Mean serum levels of testosterone, androstenedione and dehydroepiandrosterone-sulfate decreased significantly with spironolactone but showed no change with cimetidine. Our data suggest that spironolactone may be useful as antiandrogen in the short term therapy of acne vulgaris.
TL;DR: In this article, the non-axisymmetric dynamic behavior of buried orthotropic cylindrical shells excited by a combination of P-, SV- and SH-waves was investigated and it was found that shell response is significantly influenced by variations in the shell orthotropy parameters and by the soil condition around the shell.
01 Jan 1988
TL;DR: The bicyclic sesquiterpene lactone isolated from the petroleum ether extract of the aerial part of the Indian Composite Sphaeranthus indicus deonstrated strong antimicrobial activity against Staphylococcus aureus, S. albus, Escherichia coli, Fusarium sp.
Abstract: A bicyclic sesquiterpene lactone has been isolated from the petroleum ether extract of the aerial part of the Indian Composite Sphaeranthus indicus. The compound deonstrated strong antimicrobial activity against Staphylococcus aureus, S. albus, Escherichia coli, Fusarium sp., Helminthosporium sp. and other microorganisms.
TL;DR: The overall activity of MAO increased from November to May through February, whereas the 5-HT content which was high in November decreased during February and May, and catecholamine (CA) content and MAO activity increased with increasing photoperiod and temperature which is indicative of an enhanced CA metabolism.
Abstract: In Channa punctatus, a significant daily variation in hypothalamic 5-HT level and monoamine oxidase (MAO) activity was noticed in preparatory phase (February), but not in prespawning (May) or postspawning (November) phases. Hypothalamic dopamine (DA) and noradrenaline (NA), on the other hand, showed marked daily variation in their levels during all the three seasons with peak values in the photophase. The overall activity of MAO (mean +/- SEM on 24-hr period) increased from November to May through February, whereas the 5-HT content which was high in November decreased during February and May. The NA and DA levels were low in November and February and high in May. The catecholamine (CA) content and MAO activity increased with increasing photoperiod and temperature which is indicative of an enhanced CA metabolism.