Showing papers by "Deen Dayal Upadhyay Gorakhpur University published in 2003"
TL;DR: In this paper, the effect of 5-nitro-2-4-dihydro-3H-1,2,4-triazole-3-one (NTO) and two of its transition metal salts, namely Cu(nTO) 2 and Fe(nto) 3, during the combustion of composite solid propellants of hydroxyl-terminated polybutadiene (HTPB) and ammonium perchlorate (AP) has been studied.
77 citations
TL;DR: In this article, the leaf essential oil of Tagetes erecta has been found to have a statistically significant antifungal and insecticidal activity, but only partially affected the mycelial growth of any of the tested fungi.
Abstract: Chemical investigations on the leaf essential oil of Tagetes erecta, performed by HPLC, GC and GC–MS techniques, showed the presence of 26 components, accounting for 89% of the total oil. The major constituents were (Z)-β-ocimene (42.2%), dihydrotagetone (14.3%), (Z)-tagetone (8.3%), limonene (7.3%), (E)-ocimenone (6.1%) and (Z)-ocimenone (5.3%). The biocidal investigations showed that the oil possessed a significant but limited and dose-related antifungal and insecticidal activity. The oil showed 100% mortality of white termite (Odontotermes obesus Rhamb.) at a dose of 6 µl/Petri-plate after 24 h of exposure, while at lower doses and shorter exposures it showed diminished mortality rates. The oil only partially affected the mycelial growth of any of the tested fungi. Thus, the leaf oil of this plant, which is rich in (Z)-β-ocimene, has a statistically significant antifungal and insecticidal activity. Copyright © 2002 John Wiley & Sons, Ltd.
61 citations
TL;DR: In this article, the thermolysis of HMX, Estane and two of their plastic bonded explosives (PBXs) were investigated using non-isothermal TG, isothermal TG and DSC under an inert gas (N2) atmosphere.
51 citations
TL;DR: In this paper, the effect of these additives on the non-isothermal heating of ammonium nitrate (AN) from room temperature to ∼300°C was studied using TGA and DTA.
47 citations
TL;DR: The leaf extracts of N. indicum have potent piscicidal activity against fish C. punctatus and also significantly affect both aerobic and anaerobic pathway of respiration in fish.
44 citations
TL;DR: In this article, the authors studied the effect of magnetic field on cavity formation inside a blast wave propagating into a perfectly conducting gas with density varying as some power of distance from the plane or line of explosion.
Abstract: In the present paper, we have made an attempt to study the effects of the presence of a magnetic field on the cavity formation inside a blast wave propagating into a perfectly conducting gas with density varying as some power of distance from the plane or line of explosion. In order to obtain the closed form solutions for the flow variables inside the blast wave and to solve the problem of cavity formation analytically, a relation is taken between the ordinary pressure and the total pressure. It i s found that if the value of the inhomogeneity index $\alpha$
is greater than a critical value $\alpha_c$
(a function of MA - Alfven Mach Number, $\gamma$
- adiabatic index and i - wave geometry index), a contact discontinuity appears at some point inside the blast wave and the cavity formation occurs. The effect of the presence of magnetic field is found to increase the tendency of cavity formation.
43 citations
TL;DR: In this article, a review of 5-nitro-2-4-dihydro-3H-1,2,4-triazole-3-one (NTO) is presented.
42 citations
TL;DR: In this article, several samples of ion-conducting silver phosphate glasses doped with zinc/cadmium halides are prepared and subjected to X-ray diffraction analysis, transference number measurement, and electrical conductivity studies.
41 citations
TL;DR: In this article, the authors used both model fitting and model free isoconversional methods to analyse the kinetics of decomposition of five bisethylenediamine metal perchlorate (BEMP) complexes.
38 citations
30 citations
TL;DR: The repellent properties of different fractions isolated from Lantana camara flowers by using steam distillation, solvent partition and chromatographic methods were evaluated against Aedes mosquitoes and purification of the most efficient fraction into pure compounds resulted in any increase in repellency.
Abstract: :
The repellent properties of different fractions isolated from Lantana camara flowers by using steam distillation, solvent partition and chromatographic methods were evaluated against Aedes mosquitoes. Maximum protection time of one fraction eluted by chloroform from a silica gel column was 3.45 h. One application of this fraction gave 100% protection for 2 h and may protect 75.8% at 7 h (t = 7.00, P < 0.001) against the bites of Aedes mosquitoes. Further purification of the most efficient fraction into pure compounds did not result in any increase in repellency.
TL;DR: Tentative structures are proposed for these complexes based upon elemental analyses, electrical conductance, magnetic moment and spectral data and attempts have been made to establish a correlation between antibacterial activity and the structures of the products.
Abstract: The reactions of mono(cyclopentadienyl)titanium(IV) trichloride and bis(cyclopentadienyl)titanium(IV)/ zirconium(IV) dichloride with a new class of dithiosemicarbazone, derived by condensing piperazine dithiosemicarbazide with benzaldehyde (L1H2), 2-chlorobenzaldehyde (L2H2), 4-nitrobenzaldehyde (L3H2) or salicylaldehyde (L4H4) have been studied and different types of binuclear products, viz [{CpTiCl2}2L], [{Cp2MCl}2L], ((L=L1, L2 or L3), [{CpTiCI}2L4] and [{Cp2M}2L4] (M=Yi or Zr), have been isolated Tentative structures are proposed for these complexes based upon elemental analyses, electrical conductance, magnetic moment and spectral (electronic, IR, 1H and 13C NMR) data Attempts have been made to establish a correlation between antibacterial activity and the structures of the products
TL;DR: Effect of single and binary treatments of plant‐derived molluscicides on different enzymes—acetylcholinesterase, lactic dehydrogenase, LDH and acid/alkaline phosphatase—in the nervous tissue of the harmful terrestrial snail Achatina fulica were studied.
Abstract: Effect of single and binary treatments of plant-derived molluscicides on different enzymes--acetylcholinesterase (AChE), lactic dehydrogenase (LDH) and acid/alkaline phosphatase (ACP/ALP)--in the nervous tissue of the harmful terrestrial snail Achatina fulica were studied. Sublethal in vivo 24-h exposure to 40% and 80% LC(50) of Azadirachta indica oil, Cedrus deodara oil, Allium sativum bulb powder, Nerium indicum bark powder and binary combinations of A. sativum (AS) + C. deodara (CD) and CD + A. indica (AI) oils significantly altered the activity of these enzymes in the nervous tissue of Achatina fulica. The binary treatment of AS + CD was more effective against AChE, LDH, and ALP than the single ones. However, binary treatment of AI + CD was more effective against ALP.
TL;DR: In this paper, five bis(propylenediamine) metal nitrate (BPMN) complexes such as [M(pn) 2 ](NO 3 ) 2 (where M = Cr, Mn, Ni, Cu, Zn, and pn = propylenedamine) have been prepared and characterized by gravimetric methods, infrared and elemental analysis.
TL;DR: In this paper, ten novel organophosphorus derivatives have been prepared by the reactions of O,O-diethylchlorophosphate with two important series of substituted chalcones viz.
Abstract: Ten novel organophosphorus derivatives have been prepared by the reactions of O,O-diethylchlorophosphate with two important series of substituted chalcones viz, substituted chalcone thiosemicarbazones and substituted chalcone dithiocarbazates The derivatives have been characterized on the basis of analysis and spectral (IR, 1 H NMR) data Fungicidal activity of these derivatives against Colletotrichum falcatum , Fusarium oxysporum , and Curvularia pallescens have been evaluated The screening results have been correlated with the structural features of the tested compounds Organophosphorus derivatives containing 2,2'-dihydroxybenzalacetophenone thiosemicarbazone, 2-chlorobenzal-2'-hydroxyacetophenone thiosemicarbazone, 2-chlorobenzal-2'-hydroxy acetophenone-S-benzyldithiocarbazate proved more active than some prevalent commercial synthetic fungicides
TL;DR: During the course of a monographic study of the genus Cercospora, several previously undescribed cercosporoid hyphomycetes were encountered, some of which are treated in the present paper.
Abstract: During the course of a monographic study of the genus Cercospora, several previously undescribed cercosporoid hyphomycetes were encountered, some of which are treated in the present paper. Ten new species of Pseudocercospora [on Anogeissus (Combretaceae), Catalpa (Bignoniaceae), Cedrela (Meliaceae), Citrus (Rutaceae), Flacourtia (Flacourtiaceae), Gelsemium (Loganiaceae), Oenothera (Onagraceae), Ribes (Grossulariaceae), Roystonea (Arecaceae) and Vaccinium (Ericaceae)], two species of Pseudocercosporella [on Solidago (Asteraceae) and Trichodesma (Boraginaceae)], two species of Stenella [on Cassia (Leguminosae) and Solidago (Asteraceae)], and a new species of Ramularia on Oplopanax (Araliaceae) are described.
TL;DR: A structure has been established on the basis of elemental analyses, spectral, electronic and Mössbauer studies, and molar conductance and magnetic susceptibility measurements of mixed-valence Fe(II) Fe(III) complexes of thiocarboxylic acids and straight chain fatty acids.
TL;DR: The dynamical organization of counterions and water molecules around the triplex formed by mixed sequences is described here and it has been observed that cations prefer to bind between two adjoining purines of the second and the third strands.
Abstract: A theoretical model for the hydration pattern and motion of ions around the triple helical DNA with mixed sequences d(GACTGGTGAC)d(GTCACCAGTC)*d(GACTGGTGAC) in solution, during MD simulation, using the particle mesh Ewald sum method, is elaborated here. The AMBER 5.0 force field has been used during the simulation in solvent. The simulation studies support a dynamically stable atmosphere around the DNA triplex in solution over the entire length of the trajectory. The results have been compared with Hoogsteen triplexes and examined in the context of the observed behaviour of hydration in crystallographic data of duplexes. The dynamical organization of counterions and water molecules around the triplex formed by mixed sequences is described here. It has been observed that cations prefer to bind between two adjoining purines of the second and the third strands. The idea of localized complexes (mobile counterions in unspecific electronegative pockets around the DNA triplex with water molecules) may have important implications for understanding the specificity of the interactions of nucleic acids with proteins and other ligands.
TL;DR: Electrochemical modification of cellulose acetate membrane upon immobilization of the anionic surfactant (SDS) has been explored on the basis of membrane potential studies to demonstrate correspondence between the immobilized Surfactant and the permselectivity of the membrane.
TL;DR: Some di− and triorganotin(IV) complexes of 2−hydroxyacetophenone semicarbazone (H2MeSSC) and thiosemicarachnoid (TH2MeSTSC) have been synthesized by the reactions of corresponding di-and tri-organotin (IV) chlorides with the anionic form of the ligands in desired molar ratios as mentioned in this paper.
Abstract: Some di‐ and triorganotin(IV) complexes of 2‐hydroxyacetophenone semicarbazone (H2MeSSC) and thiosemicarbazone (H2MeSTSC) have been synthesized by the reactions of corresponding di‐ and triorganotin(IV) chlorides with the anionic form of the ligands in desired molar ratios. All the compounds have been characterized by elemental analyses and spectral (IR, 1H, 13C and 119Sn NMR) studies.
TL;DR: In this article, a hexa-coordinate silicon compounds with the multidentate azomethine ligand N,N′−o−phenylenebis(salicylaldimine) have been synthesized and characterized by elemental analyses, molecular weight determinations and spectral (IR, 1H, 13C and 29Si NMR) studies.
Abstract: Hexa‐coordinate silicon compounds with the multidentate azomethine ligand N,N′‐o‐phenylenebis(salicylaldimine) have been synthesized and characterized by elemental analyses, molecular weight determinations and spectral (IR, 1H, 13C and 29Si NMR) studies. The data suggest octahedral geometry around the silicon atom in the resulting complexes.
Journal Article•
TL;DR: These extracts show mortality at higher concentration and recovery after 7th day of withdrawal, so the lower doses of purified form of stem-bark can be used as bio-pesticides for the control of aquatic weeds without environmental hazards.
Abstract: Stem-bark extracts of four different plants (Euphorbia royleana, Jatropha gossypifolia, Nerium indicum and Thevetia peruviana) caused mortality and biochemical changes in freshwater non-target fish Channa marulius. It was found that dilute stem-bark powder was effective in killing the fishes. The ranking of toxicity of four plants was N. indicum > E. royleana > J. gossypifolia and T. perucviana. Biochemical changes were observed in gonad tissue, after exposure to 40% and 80% of LC50 (24h) of stem-bark extract of all plants. Withdrawal experiments, showed recovery in total protein, total free amino acid, while partial slow recovery observed in glycogen level after 144 h on termination of experiment. It has been suggested that the alterations at both level (metabolic and enzyme) is due to activation of protein kinase C. These extracts show mortality at higher concentration and recovery after 7th day of withdrawal. So, the lower doses of purified form of stem-bark can be used as bio-pesticides for the control of aquatic weeds without environmental hazards.
TL;DR: In this article, the selectivity of cellulose acetate membrane with and without stigmasterol has been determined from transport numbers and the variation of these parameters with concentration and pH has also been examined.
TL;DR: In this article, the matching of continuous gravitational wave (CGW) signals in an all sky search with reference to Earth-based laser interferometric detectors was investigated, where the source location was considered as the parameters of the signal manifold and templates corresponding to different source locations.
Abstract: We investigate the matching of continuous gravitational wave (CGW) signals in an all sky search with reference to Earth based laser interferometric detectors. We consider the source location as the parameters of the signal manifold and templates corresponding to different source locations. It has been found that the matching of signals from locations in the sky that differ in their co-latitude and longitude by π radians decreases with source frequency. We have also made an analysis with the other parameters affecting the symmetries. We observe that it may not be relevant to take care of the symmetries in the sky locations for the search of CGW from the output of LIGO-I, GEO600 and TAMA detectors.
TL;DR: In this article, three dichloroanilinium hydrogensulfate (DCAHS) and two dichloroaminobenzene sulfonic acids (DCABSA) were formed while treating corresponding amines with excess amount of conc sulfuric acid.
TL;DR: In this paper, the authors established certain transformations of basic hypergeometric series with more than one base, which lead to interesting transformations of bi-basic and poly-basic q-series.
TL;DR: Hexacoordinate silicon compounds with the tetradentate azomethine ligand N,N′-ethylenebis(2-hydroxyacetophenoneimine) have been prepared and characterized by elemental analyses, molecular weight determinations and spectral (IR, 1H, 13C and 29Si NMR) studies as discussed by the authors.
Abstract: Hexacoordinate silicon compounds with the tetradentate azomethine ligand N,N′-ethylenebis(2-hydroxyacetophenoneimine) have been prepared and characterized by elemental analyses, molecular weight determinations and spectral (IR, 1H, 13C and 29Si NMR) studies. The data clearly demonstrate the octahedral geometry around the silicon atom.