Showing papers by "Bharathiar University published in 2000"
TL;DR: A sequential anaerobic–aerobic treatment process based on mixed culture of bacteria isolated from textile dye effluent-contaminated soil was used to degrade sulfonated azo dyes Orange G (OG), Amido black 10B (AB), Direct red 4BS (DR) and Congo red (CR).
Abstract: A sequential anaerobic–aerobic treatment process based on mixed culture of bacteria isolated from textile dye effluent-contaminated soil was used to degrade sulfonated azo dyes Orange G (OG), Amido black 10B (AB), Direct red 4BS (DR) and Congo red (CR). Under anaerobic conditions in a fixed-bed column using glucose as co-substrate, the azo dyes were reduced and amines were released by the bacterial biomass. The amines were completely mineralized in a subsequent aerobic treatment using the same isolates. The maximum degradation rate observed in the treatment system for OG was 60.9 mg/l per day (16.99 mg/g glucose utilized), for AB 571.3 mg/l per day (14.46 mg/g glucose utilized), for DR 112.5 mg/l per day (32.02 mg/g glucose utilized) and for CR 134.9 mg/l per day (38.9 mg/g glucose utilized).
198 citations
TL;DR: AM fungal species richness was found to be highest in scrub and lowest in agricultural and plantation soils, and mean colonization levels were dependent on plant life-form, life-cycle pattern and vegetation type.
Abstract: A survey of the arbuscular mycorrhizal (AM) status of plants growing in the Western Ghats region of Southern India was undertaken. Root and soil samples of plants growing in the four vegetation types forest, grassland, scrub, and cultivated land or plantation were examined. Of the 329 species (representing 61 families) examined, 174 were mycorrhizal. AM association was recorded in 81 species for the first time, including species from several families assumed to be non-mycorrhizal, e.g. Amaranthaceae, Capparaceae, Commelinaceae, Cyperaceae and Portulacaceae. AM fungal spores of 35 species belonging to Acaulospora, Gigaspora, Glomus, Sclerocystis and Scutellospora were recorded. AM fungal species richness was found to be highest in scrub and lowest in agricultural and plantation soils. Mean colonization levels were dependent on plant life-form, life-cycle pattern and vegetation type.
132 citations
TL;DR: In this article, a biowaste obtained from the fruit juice industry (FR) was used as biosorbent for the removal of toxic heavy metals (Hg, Pb, Cd, Cu, Zn, Ni, and Ni(II)).
126 citations
TL;DR: In this paper, the authors used activated carbon prepared from coconut tree sawdust, at different agitation times, carbon dose and pH, and determined the physico-chemical characteristics of this activated carbon.
120 citations
TL;DR: Four accessions of the under-utilized legume, velvet bean, collected from three different locations of Western Ghats, South India were analysed for proximate composition, mineral profiles, the protein fractions, amino acid profiles of total seed protein, in vitro protein digestibility and certain anti-nutritional factors to determine their potential as an alternative source to alleviate protein-energy-malnutrition among the people of South India.
Abstract: Four accessions of the under-utilized legume, velvet bean (Mucuna pruriens var. utilis (Wall. ex Wight) Bak. ex Burck), collected from three different locations of Western Ghats, South India were analysed for proximate composition, mineral profiles, the protein fractions, amino acid profiles of total seed protein, in vitro protein digestibility and certain anti-nutritional factors to determine their potential as an alternative source to alleviate protein-energy-malnutrition among the people of South India. The major findings of the study were as follows: crude protein ranged from 20.2-29.3%, crude lipid 6.3-7.4%, total dietary fibre 8.7-10.5%, ash 3.3-5.5% and carbohydrates 49.9-61.2%. The energy level of the seed (1562-1597 kJ 100 g-1 DM) was comparable with commonly consumed Indian pulses. Mineral profiles, viz. sodium, potassium, calcium, magnesium, phosphorus, iron, copper, zinc and manganese ranged from 43.1-150.1, 778.1-1846.0, 393.4-717.7, 174.9-387.6, 98.4-592.1, 10.8-15.0, 0.9-2.2, 5.0-10.9, 3.9-4.3 mg 100(-1) seed flour, respectively. The data on seed protein fractions revealed that the globulins constitute the major bulk of the seed protein as in most legumes. Profiles of amino acids of total seed proteins detected in the present study revealed that they contain relatively higher levels of all essential amino acids except threonine, leucine and lysine in black-coloured seed coat accessions and phenylalanine and tyrosine in white-coloured seed coat accession compared with the FAO/WHO (1991) requirement pattern. The in vitro protein digestibility of the legumes under study ranged from 72.4-76.9%. Anti-nutritional substances like total free phenolics, tannins, L-DOPA, trypsin inhibitor activity and phytohaemagglutinating activity also were investigated. The detected anti-nutritional factors probably have little nutritional significance if the beans are properly processed.
105 citations
TL;DR: In this article, an approximate numerical solution for the steady MHD flow over an infinite horizontal plate in the presence of species concentration and chemical reaction has been obtained by solving the nonlinear governing equations using R. K. Gill's method.
Abstract: An approximate numerical solution for the steady MHD flow over an infinite horizontal plate in the presence of species concentration and chemical reaction has been obtained by solving the non-linear governing equations using R. K. Gill's method. The fluid is assumed to be viscous, incompressible, and electrically conducting. A uniform transverse magnetic field is applied. It has been observed that in the presence of chemical reaction (1) the velocity and the concentration decrease with increase of the chemical reaction parameter and vice versa, (2) the velocity decreases and the concentration is uniform with increase of the magnetic parameter and vice versa.
82 citations
TL;DR: The concentration of primordial radionuclides in soil samples of Gudalore Taluk in the Udagamandalam district has been measured from the gamma ray spectrum of the soil and the results have been compared with other global radioactivity measurements and evaluations.
77 citations
TL;DR: It is indicated that the host influences AM colonization by regulating the formation of AM fungal structures and spore formation via availability of root carbohydrates, validates the basic assumption that mycorrhizal fungi act as a 'strong sink' for photosynthates.
Abstract: The interaction of plant nutrients, root-soluble carbohydrate availability and arbuscular mycorrhizal (AM) fungi was examined in field grown cowpea [Vigna unguiculata (L.) Walp.]. Plant nutrients were altered through application of farmyard (cow dung, sheep manure) and green (sunnhemp, pongamia) manures. Organic amendments increased plant growth, AM fungal colonization, soluble carbohydrate concentration in roots, and spore numbers. Percent total colonization, root length with vesicles and spore numbers in soil were negatively correlated with the concentration of soluble carbohydrates within roots, which in turn were related to tissue nutrient levels. However, a positive correlation existed between soluble carbohydrate concentrations within root and root length with arbuscules. But the mycorrhizal parameters were related more to plant nutrient level and their ratios, indicating that tissue nutrients have another level of control in addition to their effect on soluble carbohydrate concentration in roots. Increased AM colonization due to organic amendment significantly reduced nutrient imbalances. The strong relationship between colonization and root-soluble carbohydrate concentration levels validates the basic assumption that mycorrhizal fungi act as a 'strong sink' for photosynthates. This study indicates that the host influences AM colonization by regulating the formation of AM fungal structures and spore formation via availability of root carbohydrates.
69 citations
TL;DR: In this paper, a statistical design of experimental study of the D-gun spraying of Al 2 O 3 powder is presented, where the attributes of the coatings are correlated with the changes in operating parameters and their relative importance and contribution ratios to overall variance are calculated.
Abstract: Detonation gun (D-gun) spraying is one of the most promising thermal spray variants for depositing high quality wear resistant coatings. Of all the ceramic materials that can be D-gun sprayed, alumina (Al 2 O 3 ) is the most widely established and these coatings have already gained industrial acceptance for diverse applications. The present study deals with a statistical design of experimental study of the D-gun spraying of Al 2 O 3 powder. Coating experiments were conducted, using a Taguchi-full factorial (L 16 ) design parametric study, to optimize the D-gun spray process parameters. Four selected important spraying parameters were considered in their upper and lower levels of the predefined range according to the test matrix, in order to display the range of processing conditions and their effect on the coating quality. Optical microscopy, scanning electron microscopy, X-ray diffraction, image analysis and hardness testing was used for characterization. Coating qualities are discussed with respect to surface roughness, hardness, porosity and microstructure. The attributes of the coatings are correlated with the changes in operating parameters and their relative importance and contribution ratios to overall variance are calculated.
55 citations
TL;DR: The results of the study demonstrated that the accessions of C. hirsuta seeds collected from Tamil Nadu, India, could be good sources of some important nutrients for humans.
Abstract: Seven accessions of the underutilized legume, Cassia hirsuta L., seeds collected from seven different agroclimatic regions of Tamil Nadu, India, were analyzed for proximate composition, total proteins, protein fractions, mineral profiles and selected antinutritional factors. Crude protein ranged from 15.52 to 20.74%, crude lipid 3.77-7.04%, crude fiber 4.68-6.92%, ash 3.98-6.42% and carbohydrates 62.45-70.16%. Energy values of the seeds were 1549-1634 kJ/100 g (DM), which are comparable to those of other legumes. Data on seed protein fractions revealed that globulins constituted the bulk of the seed protein as in most legumes. Mineral contents of the seeds showed greater variation. Potassium was the most abundant mineral (1029-1786 mg/100 g), whereas manganese was low (2.1-2.2 mg/100 g). Antinutritional factors such as total free phenolics, tannins, L-DOPA and lectins were analyzed. The results of the study demonstrated that the accessions of C. hirsuta seeds collected from Tamil Nadu, India, could be good sources of some important nutrients for humans.
49 citations
TL;DR: In this article, the existence of mild solutions of a nonlinear neutral integrodifferential equation in a Banach space was proved by using the Schaefer fixed point theorem, and the results were obtained by using a fixed-point theorem for the controllability problem for the neutral system.
TL;DR: Seeds of Capsicum annuum L. var.
Abstract: Seeds of Capsicum annuum L. var. G-4 Bhagyalakshmi were subjected to 15, 25, 35 kR doses of gamma ray, and 0.8% and 1% ethyl methane sulphonate (EMS). Effects of mutagenic treatments of meiosis viz. chromosomal anamolies, pollen sterility, seed sterility and survival percentage in M2 generation have been reported. EMS was found more effective in inducing meiotic irregularities than gamma ray treatment. A dose dependent increase in meiotic anomalies was obtained with all the mutagenic treatments.
TL;DR: In this paper, sufficient conditions for controllability of neutral functional integrodifferential systems in a Banach space were established by using the Schaefer fixed-point theorem, and an example is provided to illustrate the theory.
Abstract: Sufficient conditions for controllability of neutral functional integrodifferential systems in a Banach space are established. The results are obtained by using the Schaefer fixed-point theorem. An example is provided to illustrate the theory.
TL;DR: Optical constants of vacuum-evaporated CdS thin film have been determined by spectroscopic ellipsometry in the photon energy range from 1.2 to 5.5 eV at room temperature as mentioned in this paper.
Abstract: Optical constants of vacuum-evaporated CdS thin film have been determined by spectroscopic ellipsometry in the photon energy range from 1.2 to 5.5 eV at room temperature. The dielectric constant values were found to be substantially lower than those for the bulk CdS. The optical constants of the film were also determined using the optical transmittance measurements and the results were discussed.
TL;DR: The results suggest the inhibitory effect of MTX on steroidogenisis, and specifically the specific activities of 3β- and 17β-hydroxy steroid dehydrogenase were markedly diminished in both MTX and MTX + LCN treated groups.
Abstract: The effects of single dose, 4 consecutive days, 4 and 8 weekly doses of methotrexate (MTX) treatment (3 mg/kg body weight, intramuscularly) with and without leucovorin (LCN) supplementation (0.3 mg/kg body weight, intramuscularly) on serum testosterone titres, total, free and esterified cholesterol concentrations and steroidogenic enzymes, viz. 3β- and 17β-hydroxy steroid dehydrogenase activities were studied in adult albino rats. MTX treatment caused a marked reduction in serum testosterone titres in all the treatment groups in a duration-dependent manner. LCN supplementation did not restore serum testosterone titres to normalcy. Total and free cholesterol concentrations remained unaltered in both MTX and MTX + LCN treated groups. On the otherhand, a marked increase in esterified cholesterol concentration was evident only in weekly dose treatment groups. The specific activities of 3β- and 17β-hydroxy steroid dehydrogenase were markedly diminished in both MTX and MTX + LCN treated groups. The results sugg...
TL;DR: In this article, the authors compared the characteristics of Al2O3 coatings deposited using the above techniques by using Taguchi experimental design Alumina coating experiments were conducted using a Taguchi fractional-factorial (L8) design parametric study to optimize the spray process parameters for both APS and D-gun.
Abstract: Atmospheric plasma spraying (APS) is a most versatile thermal spray method for depositing alumina (Al2O3) coatings, and detonation gun (D-gun) spraying is an alternative thermal spray technology for depositing such coatings with extremely good wear characteristics The present study is aimed at comparing the characteristics of Al2O3 coatings deposited using the above techniques by using Taguchi experimental design Alumina coating experiments were conducted using a Taguchi fractional-factorial (L8) design parametric study to optimize the spray process parameters for both APS and D-gun The Taguchi design evaluated the effect of four APS and D-gun spray variables on the measured coating attributes The coating qualities evaluated were surface roughness, porosity, microhardness, abrasion, and sliding wear The results show that the coating quality is directly related to the corresponding coating microstructure, which is significantly influenced by the spray parameters employed Though it is evident that the D-gun-sprayed coatings consistently exhibit dense and uniform microstructure, higher hardness, and superior tribological performance, the attainment of suitable plasma-sprayed coatings can be improved by employing the Taguchi analysis
TL;DR: Several new hexa-coordinated ruthenium(III) complexes of the type [RuX2(EPh3)2(L)] (X = CI, Br; E = P, As; LH = o-vanillidene-o-toluidine, O-vanilla-m-toline, and o-villidane-p-tocuidine) have been prepared by reacting with Schiff bases derived from the condensation of ovanillin with aniline, o-toiletine, m-t
Abstract: Several new hexa-coordinated ruthenium(III) complexes of the type [RuX2(EPh3)2(L)] (X = CI, Br; E = P, As; LH = o-vanillideneaniline, o-vanillidene-o-toluidine, o-vanillidene-m-toluidine and o-vanillidene-p-toluidine) have been prepared by reacting [RuX3(EPh3)3] or [RuBr3(EPh3)2(MeOH)] (X = CI, Br; E = P, As) with Schiff bases derived from the condensation of o-vanillin with aniline, o-toluidine, m-toluidine or p-toluidine in benzene in the presence of triethylamine. In all of the reactions the Schiff bases behave as monobasic bidentate ligands. The new complexes have been characterised on the basis of elemental analyses, spectral (IR, electronic, EPR) and cyclic voltammetric studies. An octahedral structure has been tentatively proposed for all of the new complexes. The Schiff bases and the new complexes have been tested in vitro against the pathogenic fungi Aspergillus niger and Fusarium Sp.
TL;DR: Ruthenium(III) complexes have been synthesized by reacting [RuCl3(PPh3)3], the authors with tetradentate Schiff bases, such as bis(acetylacetone)tetramethylenediimine (H2acactet), bis(dibenzoylmethane)to-phenylenedisimine(H2dbmtet) and bis(dbm-o-ph) all of which have been tested for their antibacterial activities.
Abstract: Ruthenium(III) complexes, [RuX(EPh3)(LL′)] (X = Cl, Br; E = P, As; LL′-acactet, dbm-tet, dbm-o-ph), have been synthesised by reacting [RuCl3(PPh3)3], [RuCl3(AsPh3)3], [RuBr3(AsPh3)3] or [RuBr3(PPh3)2(MeOH)] with tetradentate Schiff bases such as bis(acetylacetone)tetramethylenediimine (H2acactet), bis(dibenzoylmethane)tetramethylenediimine (H2dbmtet) and bis(dibenzoylmethane)-o-phenylenediimine (H2dbm-o-ph) All the complexes have been characterised by elemental analysis, ir, electronic spectra, epr, magnetic moment and cyclic voltammetric data and an octahedral structure has been tentatively proposed These new complexes have been tested for their antibacterial activities
TL;DR: In this paper, a combined temperature and species gradients induced buoyancy-driven natural convection flow of cold water at temperatures in the neighbourhood of the temperature of maximum density is investigated.
01 May 2000
TL;DR: In this paper, the existence of mild and strong solutions of a nonlinear integrodifferential equation of Sobolev type with nonlocal condition was proved by using semigroup theory and the Schauder fixed point theorem.
Abstract: In this paper we prove the existence of mild and strong solutions of a nonlinear integrodifferential equation of Sobolev type with nonlocal condition. The results are obtained by using semigroup theory and the Schauder fixed point theorem.
TL;DR: It is shown that seed reserves are not only important for seedling growth, but also for mycorrhizal formation and nodulation, and that plants without seed reserves were low initially, but had higher growth rates during later stages.
Abstract: We show here that seed reserves in Leucaena leucocephala (Lam.) de Wit. and Zea mays L. (maize) are important for mycorrhizal formation and seedling growth. Seed reserve removal reduced mycorrhizal formation markedly in Leucaena but not in maize, except at 15 and 45 days after seed reserve removal. Partial or total removal of seed reserves decreased plant growth and tissue nutrient concentrations in both hosts. Nodule number in Leucaena, which was related positively to plant biomass and mycorrhizal infection levels, was reduced when one or both cotyledons were severed. Leucaena seedlings without or with partial seed reserves had higher nutrient use efficiencies throughout seedling growth. But such an effect was observed only initially in maize. Seed reserve removal increased the specific absorption rates of nutrients in both hosts. Phosphorus absorption rate was significantly and positively related to root infection levels in both Leuceana and maize. Though the growth rates of plants without seed reserves were low initially, these plants had higher growth rates during later stages. We conclude that seed reserves are not only important for seedling growth, but also for mycorrhizal formation and nodulation.
TL;DR: In this paper, stable bis(β-diketonato) bridged binuclear complexes prepared by reacting [RuX3(EPh3)3] (X = Cl or Br; E = P or As) with (RCO)(MeCO)CH-Y-CH(COR)(COMe) [R = Me or Ph; Y = (CH 2)6, (CH2)10] in a 2:1 molar ratio in benzene, have been characterised by elemental analyses, i.p.r., electronic, e.r
Abstract: Stable bis(β-diketonato) bridged binuclear complexes prepared by reacting [RuX3(EPh3)3] (X = Cl or Br; E = P or As) with (RCO)(MeCO)CH–Y–CH(COR)(COMe) [R = Me or Ph; Y = (CH2)6, (CH2)10] in a 2:1 molar ratio in benzene, have been characterised by elemental analyses, i.r., electronic, e.p.r. and cyclic voltammetry. The oxidation state of the metal ion in these complexes is confirmed as + 3 by electrochemical and by e.p.r. measurements. The complexes belong to a low-spin d5 configuration. An attempt has been made to ascertain the effect of the length of the bridging ligand on the electron transfer processes by cyclic voltammetry in these binuclear complexes. Based on the above studies an octahedral geometry has been tentatively proposed. The new complexes have been subjected to the antifungal activity studies.
TL;DR: In this paper, the existence of N2H+5 ion in simple salts and the bidentate coordination of both hydrazine and dianion in the complexes is investigated.
Abstract: Hydrazinium oxydiacetate salts of formulae N2H5(Hoda)⋅H2oda, N2H5(Hoda) and (N2H5)2oda (H2oda=oxydiacetic acid) and complexes of the types, M(oda)⋅2N2H4⋅xH2O (where M=Co, Ni and Cd; x=0 for Co and Ni;x=1 for Cd) and Zn(oda)⋅N2H4⋅H2O have been prepared and characterized by analytical, spectral, thermal and X-ray powder diffraction data. IR data document the existence of N2H+5 ion in the simple salts and the bidentate coordination of both hydrazine and dianion in the complexes. Complete decomposition of hydrazinium salts takes place via oxydiacetic acid intermediate. Cobalt and nickel complexes decompose in a single step, whereas zinc and cadmium complexes decompose through hydrazinate intermediates. However, all the metal complexes yield metal oxide as the final residue. Isomorphic nature of the cobalt and nickel complexes is evident from XRD data.
TL;DR: The multinomial logistic regression analysis reveals that in South India the downward trend in the proportion of marriages between close blood relatives is entirely explained by rising age at marriage and women's education over time.
Abstract: The data from the National Family Health Survey, 1992-1993, show that the extent of consanguinity is high (34.7 percent) in South India; 26.2 percent of women married close blood relatives, and 8.5 percent of women married distant blood relatives. A definite downward trend in the proportion of marriages between close blood relatives is observed. Education, age at marriage, religion and caste, and urban-rural childhood residence have significant independent effects on consanguinity. The multinomial logistic regression analysis reveals that in South India the downward trend in the proportion of marriages between close blood relatives is entirely explained by rising age at marriage and women's education over time.
TL;DR: I-V characteristics of a non-transferred DC plasma spray torch operating on argon and argon + nitrogen mixtures are reported in this article, where the arc voltage is decreased with increase in arc current and increased with an increase in electrode gap.
Abstract: I–V characteristics of a non-transferred DC plasma spray torch operating on argon and argon + nitrogen mixtures are reported Arc voltage is decreased with increase in arc current and increased with increase in electrode gap Arc power is higher at higher percentage of nitrogen in argon Nottingham co-efficients were calculated using numerical method
TL;DR: Multiple antibiotic resistance indexing of both the strains revealed that they originated from high-risk sources of contamination, where antibiotics were often used, and prevention of cross contamination of chicken meat will be needed.
Abstract: The incidence of Salmonella and Escherichia coli in chicken retail outlets in a residential area of Coimbatore, Tamil Nadu, India., was studied with the view that accessories may be a source of cross-contamination.Accessories like cages, knives, chopping boards, weighing balance trays and the hands of the butcher were examined.A total of 14 Salmonella as well as 31 E.coli strains were isolated from different sources.Strains of which 13 were S.enteritidis and 1 was S.cerro.The incidence of E.coli was higher than that of Salmonella.The highest incidence of Salmonella was found in chopping boards and the maximum level of E.coli was detected in cages.Salmonella and E.coli isolates were able to survive on different types of wood and metal surfaces for up to 24 hours at room temperature(28±2°C)without any nutrients.This showed that viable cells of both the bacteria could remain on the surface of the chopping boards, knives and weighing balance trays and cause cross contamination.All the strains of Salmonella and E.coli isolated were examined for resistance against 10 antibiotics.All Salmonella strains were resistant to neomycin, polymyxin-B and tetracycline and more than 90% were resistant to ampicillin. E.coli strains(100%)were found to be resistant to ampicillin, neomycin, polymyxin-B, sulphamethoxazole and tetracycline.Multiple antibiotic resistance indexing of both the strains revealed that they originated from high-risk sources of contamination, where antibiotics were often used.In conclusion, these organisms persist in the outlet for long periods and prevention of cross contamination of chicken meat will be needed.
TL;DR: The maximum amount of all nutrients was returned through leaf- litter and lowest amount through twig-litter, and the highest concentration of N, P, Ca and Mg was in leaf litter.
Abstract: From January 1992 to December 1994 we investigated the litter production and nutrient cycling behavior of Bambusa bambos plantations of different ages. The annual litter production was 15.4 t ha▭ 1, 17 t ha▭ 1, and 20.3 t ha▭ 1 in 4-, 5- and 6-year-old plantations. Litter production was significantly higher compared to other plantations of similar age. Litter fall had a bimodel pattern with a principal peak in the winter and another in the late summer in all ages. Of the total annual litter production, leaf-litter accounted for 58% and twig-litter 42%. With regards to nutrients, the highest concentration of N, P, Ca and Mg was in leaf litter. On an annual basis, 120, 10, 101, 60 and 66 kg/ha (4 year), 141, 13, 121, 72 and 79 kg/ha (5 year) and 184, 16, 183, 91 and 96 kg/ha (6 year) of N, P, K, Ca and Mg were returned through litter fall. The maximum amount of all nutrients was returned through leaf-litter and lowest amount through twig-litter.
TL;DR: In this article, an analytical equation with three kinetic parameters (activation energy (E a ), transformation order (n) and the frequency factor (v)) is derived from the Johnson-Mehl-Avrami (JMA) theory to describe the constant heating rate DSC spectra.
Abstract: Bi 2 Se 3 thin films are prepared by thermal evaporation method onto well-cleaned glass substrates. From the XRD analysis, the film is found to be amorphous in nature. Thermal analysis of Bi 2 Se 3 sample scraped off from the glass substrate is performed using the technique differential scanning calorimetry (DSC) at different healing rates Kissinger method is used to analysis these constant heating rate spectra and the activation energy 'E a ' corresponding to the phase transformation is calculated through the examination of the DSC peak temperature shift induced by variation of the heating rate. An analytical equation with three kinetic parameters (activation energy (E a ), transformation order (n) and the frequency factor (v)) is derived from the Johnson-Mehl-Avrami (JMA) theory to describe the constant heating rate DSC spectra. Using the activation energy from Kissinger plot, theoretical constant heating rate DSC traces are generated for arbitrary values of 'v' and 'n' using the analytical equation. Finally, theoretically generated DSC spectra is compared with that of the experimental one and the unknown values 'v' and 'n' are determined.
TL;DR: The most probable stereochemistry of the polymeric compounds has been ascribed on the basis of the available spectral and thermal data as discussed by the authors, based on the available IR data augmenting the bridging behaviour of both the hydrazine and the long chain dicarboxylate dianion except in the case of the cadmium pimelate compound.
Abstract: Metal hydrazine dicarboxylates of cobalt, nickel, zinc and cadmium with pimelic, suberic, azelaic and sebacic acids have been prepared and characterised by analytical, spectral, thermal and X-ray powder diffraction studies. IR data augment the bridging behaviour of both the hydrazine and the long chain dicarboxylate dianion except in the case of the cadmium pimelate compound. The most probable stereochemistry of the polymeric compounds has been ascribed on the basis of the available spectral and thermal data. Almost all of the complexes decompose to give its metal oxide through their metal dicarboxylate intermediates. The dihydrazine complexes of the metals with their respective anions are isomorphous among themselves.