Showing papers by "Annamalai University published in 1994"
TL;DR: The chemical composition of Cauvery river water is dominated by Na and HCO 3, indicating the influence of airborne salts with oceanic affinities in the downstream region of the river as discussed by the authors.
31 citations
Journal Article•
22 citations
TL;DR: In this article, the response of Sesuvium portulacastrum L., to the elogenous addition of sodium chloride (NaCl), applied at different concentrations ranging from 100 to 900 mM was evaluated.
Abstract: Response of Sesuvium portulacastrum L., to the elogenous addition of sodium chloride (NaCl), applied at different concentrations ranging from 100 to 900 mM was evaluated. Leaf area, shoot and root weight of the treated plants were increased significantly. Total nitrogen (N) content of leaves, stem and root was significantly increased up to 600 mM NaCl, and thereafter declined moderately. Accumulation of potassium (K), and calcium (Ca) were exponentially increased with NaCl treatment as also observed in the case of N. Sodium content of shoot and roots of S. portulacastrum increased significantly with increasing NaCl concentrations. Certain essential elements like copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) were also accumulated in all plant parts significantly, up to 600 mM. However, due to high salinization, growth and development of plants inhibited markedly. Furthermore, elemental concentration decreased beyond 600 mM level of NaCl. Due to aging and senescence, marked changes in leaf a...
21 citations
TL;DR: In this paper, the main product of oxidation is corresponding benzaldehyde and glyoxalic acid, and a suitable mechanism is proposed for the transition state of carbanion for electron-withdrawing and carbonium ion for releasing substituents.
17 citations
TL;DR: In this article, a comparison of the absorption and fluorescence maxima of 3-hydroxybiphenyl in various solvents reveals that the hydroxyl group in the meta position interacts with biphenyl only in the excited state.
Abstract: A comparison of the absorption and fluorescence maxima of 3-hydroxybiphenyl in various solvents reveals that the hydroxyl group in the meta position interacts with biphenyl in the excited state only. Fluorimetric titration gives stretched sigmoidal curves with two inflection points. These curves are analysed and the rate constants for the excited state proton transfer reactions are determined using the lifetimes of the species.
16 citations
Journal Article•
TL;DR: Sargassum wightii, a seaweed had the highest activity, reducing 65 per cent of plaques formed by vaccinia virus.
Abstract: Seventy three marine plant extracts were tested in vitro in chick embryo fibroblast cell culture and their anti-vaccinia virus activity was evaluated in terms of reduction in number of plaques by the extracts. Only seven extracts were found to show the activity. Sargassum wightii, a seaweed had the highest activity, reducing 65 per cent of plaques formed by vaccinia virus.
15 citations
TL;DR: In this article, Sesuvium portulacastrum, which was grown under varying levels of sodium chloride (NaCl) was determined, and amino acids, protein, proline, glycinebetaine, sugars, and starch content increased significantly up to 600 mM NaCl.
Abstract: Certain organic constituents, amino acids, protein, proline, glycinebetaine, sugars, and starch in the leaves of Sesuvium portulacastrum, which was grown under varying levels of sodium chloride (NaCl) was determined. Total amino acids lowered at increasing levels of NaCl while the protein content increased moderately up to 600 mM and thereafter increased and decreased, respectively; however, 600 mM level of NaCl significantly differed from the untreated control plants. The concentration of total sugars declined with the increasing levels of exogenous addition of NaCl up to 600 mM. Starch content increased significantly up to 600 mM NaCl and thereafter declined slightly. Proline and glycinebetaine contents were accumulated with the corresponding increase of salinization.
14 citations
01 Jan 1994
TL;DR: The season of plant collection had a marked effect on the level of larvicidal activity rather than the other factors, and the terminal portion of the root sample was found to exhibit the highest activity.
Abstract: Extracts of stilt root samples of Rhizophora apiculata were studied for mosquito larvicidal activity against Aedes aegypti as influenced by the season of collection, the maturity of sample, method of drying, and solvent used for extraction. The terminal portion of the root sample, collected during summer, dried under shade and extracted in petroleum ether, was found to exhibit the highest activity. The season of plant collection had a marked effect on the level of larvicidal activity rather than the other factors.
14 citations
TL;DR: The alcohol triacontanol, at 80 μg 1 −1 , enhanced the photosynthesis rate and stomatal conductance of hydroponically grown Rhizophora apiculata seedlings and biomass was increased by the treatment.
12 citations
01 Oct 1994
TL;DR: Seaweeds, seagrasses, and mangroves were studied for their antiviral activity against Encephalomy-ocarditis virus and only two extracts were found to be effective with both in vitro and in vivo assay systems.
Abstract: Seaweeds, seagrasses, and mangroves were studied for their antiviral activity against Encephalomy-ocarditis virus (EMCV). Of 73 extracts, 20 showed in vitro anti-EMCV activity. Of these 20 extracts, seven were prophylactically and three were therapeutically active. Only two extracts, Cheilosporum spectabile and Rhizophora mucronata, were found to be effective with both in vitro and in vivo assay systems.
12 citations
Journal Article•
TL;DR: Morphological and histopathological studies show that there were a number of visible malignant tumors in the colon and intestine of all the three experimental animals.
Abstract: Effect of feeding red chilli on the levels of lipids, fecal bile acids and fecal sterols was studied in animals given 1,2-dimethylhydrazine (DMH). When the three experimental groups were compared with control, the levels of cholesterol increased while phospholipids and free fatty acids decreased or showed no alteration in most of the tissues studied. Cholesterol-phospholipid ratio was high in both DMH as well as in the chilli + DMH treated groups. Weekly assessment of bile acids and neutral sterols showed a significant increase in all the three experimental groups, when compared to the control rats. Morphological and histopathological studies show that there were a number of visible malignant tumors in the colon and intestine of all the three experimental animals.
TL;DR: In this article, the physicico-chemical changes that occurred in a marine clay with various inorganic additives are presented and discussed, and the improvement in the strength and plasticity characteristics of the soil have also been studied and reported.
TL;DR: In this article, the rate constants for substituents are plotted against Hammett constant σ, a non-linear, "V" shaped curve is obtained, and electron-withdrawing substituent fall on one side of the curve having a negative ϱ value, while electron-releasing and releasing subsets fall on the other side with positive ϱ values.
TL;DR: It is shown that for any positive integern, then-dimensionalG-cube has an α-valuation, which gives rise to decompositions of some complete graphs into certain bipartite graphs.
Abstract: Let |E(G)|=? andf, a 1-1 mapping ofV(G) into {0,1,...,?}. Thenf is called a β-valuation ofG if the induced function given by $$\bar f(u\upsilon ) = |f(u) - f(\upsilon )|$$ , for alluv?E(G) is 1-1. A β-valuationf is called an ?-valuation ofG if there exists a nonnegative number ? such that for everyuv?E(G) withf(u)
TL;DR: In the course of the last 7 years the authors observed two cases of unequal twins, “thoracopagus parasiticus,” where the smaller member of the conjoined pair is spoken of as a parasite and the more nearly normal one as the autosite.
Abstract: In the course of the last 7 years we observed two cases of unequal twins, “thoracopagus parasiticus.” When a conjointed twin is unequal, the smaller member of the conjoined pair is spoken of as a parasite and the more nearly normal one as the autosite [3]. Reports about their anatomy and physiology are lacking in the literature, and therefore an attempt has been made to provide some information on the anatomy and physiology of the parasite.
Journal Article•
TL;DR: In this paper, the authors studied the kinetics of S-phenylthioacetic acid in the presence of perchloric acid and found that the reaction rate may involve a free radical mechanism.
TL;DR: In this paper, doubly bidentate Schiff base and bis-carboxyamide ligands were prepared by condensing 4,4′-diaminodiphenyl-sulphone with salicylaldehyde/phenylglyoxal/maleic anhydride.
Abstract: Novel doubly bidentate Schiff base and bis-carboxyamide ligands were prepared by condensing 4,4′-diaminodiphenyl-sulphone with salicylaldehyde/phenylglyoxal/maleic anhydride. These were then reacted with Cu(II), Co(II), Ni(II) and Fe(II) salts to form their respective complexes. The complexes are dark coloured, high melting substances insoluble in common organic solvents. They have been characterised based on their composition, UV-visible, infrared and ESR spectral data, magnetic susceptibility and thermal studies. In the light of the results obtained, structures of the complexes have been proposed. Referee I: W. F. Wacholtz Referee II: K. Moedritzer
TL;DR: In this article, the spatial and temporal variation of copper, zinc, cadmium and lead were determined in plankton collected over a period of two years from the Uppanar, Vellar and Kaduviar estuaries of southeast coast of India.
Abstract: Spatial and temporal variation of copper, zinc, cadmium and lead were determined in plankton collected over a period of two years from the Uppanar, Vellar and Kaduviar estuaries of southeast coast of India. Differences in metal levels were observed between sampling sites and during different seasons. Higher and lower values were found during monsoon and summer, respectively. Salinity was found to play an important role in the distribution of metals in plankton. A linear relationship was found between the metal levels in plankton and that in the dissolved fraction. the order of metal accumulation in plankton were found to be zinc < copper < lead < cadmium.
Journal Article•
TL;DR: Fifty one cases of Pelvic Inflammatory disease and sixty one control subjects were screened for the genital mycoplasmas and metabolic inhibition test revealed a titer of > 1:2 in 92% of the acute sera of PID against the homologous strain.
Abstract: Fifty one cases of Pelvic Inflammatory disease (PID) and sixty one control subjects were screened for the genital mycoplasmas. Cervical swabs, urine & blood were collected from the patients and the control subjects and were processed by standard techniques for isolation and identification of bacteria, fungi and mycoplasmas. The rate of isolation of M. hominis from the PID and controls were 54.90% and 16.39% respectively, and this difference was statistically significant (p. 1:2 in 92% of the acute sera of PID against the homologous strain and there was a rise or fall in four fold titer in 45% of the convalescent sera tested for.
TL;DR: The changing pattern of proteins in the brain during the pre- and post-mating periods (as judged by electrophoretic investigations) further supports the interrelationship of the NEC and ARG.
Abstract: The present study deals with the interrelationship of the neuroendocrine complex (NEC) and male accessory reproductive gland (ARG) of a cotton bug, Serinetha augur. The NEC consists of brain (cerebral ganglia), corpus cardiacam (CC) and corpus allatum (CA). Based on the staining reaction of aldehyde fuchsin (AF) and chrom alum haematoxylin-phloxin (CAHP), four types of neurosecretory cells have been identified in the brain. The neuroendocrine control over the ARG In S. augur was investigated through ARG extirpation (and gonadectomy)-induced hypertrophy of CA. The changing pattern of proteins in the brain during the pre- and post-mating periods (as judged by electrophoretic investigations) further supports the interrelationship of the NEC and ARG.
TL;DR: In this article, an attempt was made to study the influence of zinc (Zn) on organic constituents like polysacharides, aminoacids, and chlorophyll using an infrared (IR) technique.
Abstract: An attempt was made to study the influence of zinc (Zn) on organic constituents like polysacharides, aminoacids, and chlorophyll using an infrared (IR) technique. Zinc was applied to a soil in the form of zinc sulphate (ZnSO4) in different concentrations in which the blackgram plants were grown. The plant leaves were sampled at 30, 45, and 65 days after sowing and analyzed by IR. Intensity variations were observed with age of the plant leaves and with applied Zn concentration. The extinction coefficient ‘k’ was calculated for the prominent absorption bands at 3380, 2928, 1651, and 1026/cm in the near IR. The variations of ‘k’ values with age and concentration of Zn appear to vary linearly with the variations of essential amino acid content in blackgram leaves. The values of ‘k’ increased with low concentrations of Zn upto 150 mg/kg, while higher concentrations decreased the ‘k’ values.
TL;DR: The reaction of N-bromosuccinimide (NBS) with propargyl alcohol in aqueous acidic medium is hydroxybromination as mentioned in this paper.
Abstract: The reaction of N-bromosuccinimide (NBS) with propargyl alcohol in aqueous acidic medium is hydroxybromination It is first order with respect to NBS, propargyl alcohol and H+, and inverse first order with respect to succinimide The kinetic results point to solvated bromonium ion as the reactive species
TL;DR: The results show that Dimilin has potential for controlling Tabanid vectors and is un insecticide potentiel, which peut être utilisé pour contrôler les Tabanides vecteurs.
Abstract: The insecticide diflubenzuron, Dimilin, was applied topically to the eggs of Tabanus triceps and Chrysops dispar. Mean per cent hatchability of these eggs at various concentrations ranging from 1 to 150 ppm were observed. The hatchability depended upon the age of the egg and increased with age. A minimal dose of 10 ppm of diflubenzuron caused 100% mortality (no hatchability) at the age of 48 hr in both species. The per cent hatchability was inversely proportional to the concentration of Dimilin. The larvicidal effect of Dimilin was also noted. Larval mortality (100%) was observed after 60 hr treatment. The larval mortality was directly proportional to the concentration of Dimilin. The results show that Dimilin has potential for controlling Tabanid vectors.
TL;DR: In this article, the relation between EP-λ-matrices and EkP-λ -matrices over an arbitrary filed F is studied, and conditions for the product of Ekp-λ matrices to be anEkP λ-matrix and for the reverse order law to hold for the polynomial Moore-Penrose inverse of the product λ λ matrices are determined.
Abstract: In this paper the relation betweenEP-λ-matrices andEkP-λ-matrices over an arbitrary filedF is studied. Further, conditions for the product ofEkP-λ-matrices to be anEkP-λ-matrix and for the reverse order law to hold for the polynomial Moore-Penrose inverse of the product ofEkP-λ-matrices are determined