Deen Dayal Upadhyay Gorakhpur University

About: Deen Dayal Upadhyay Gorakhpur University is a education organization based out in Gorakhpur, Uttar Pradesh, India. It is known for research contribution in the topics: Thermal decomposition & Lymnaea acuminata. The organization has 1032 authors who have published 1591 publications receiving 21734 citations. The organization is also known as: Gorakhpur University.

Synthesis of water dispersible dendritic amino acid modified polythiophenes as highly effective adsorbent for removal of methylene blue

Abstract: Four amino acid modified conductive polythiophene polymer aggregates were electrochemically synthesized from solutions containing thiophene, perchloric acid and amino acid in acetonitrile medium and their application as adsorbent for the removal of methylene blue (MB) dye was investigated. Polymer aggregates were characterized by powder X- ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG/DTG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electrical conductivity, fractal dimension calculation, surface area measurements by Brunaure-Emmett-Teller (BET) method and pH of point of zero charge (pH PZC ). Electrical conductivity was found to increase with the size of alkyl (R) group of amino acids present in amino acid modified polythiophenes. Particles of glycine and d - alanine modified polythiophenes had an average size −1 for all adsorbents. Experimental data were tested using Langmuir, Frendlich and Temkin models, and data were best followed by Freundlich model at 30 °C. The maximum adsorption capacity (Q m ) for Leu-PTh, l -ala-PTh, d -ala-PTh, Gly-PTh, and PTh was found to be 473.1, 416.6, 400.2, 370.3 and 344.8 mg/g respectively. Various kinetic equations were applied to kinetic data and were best followed by pseudo-second-order kinetic model. The thermodynamic parameters such as change in enthalpy (Δ H °), entropy (Δ S °), and free energy (Δ G °) were calculated. The adsorption is spontaneous and endothermic in nature. Adsorption/desorption results are also reported.

Monohydroxylated polycyclic aromatic hydrocarbons influence spicule formation in the early development of sea urchins (Hemicentrotus pulcherrimus).

Abstract: We previously demonstrated that monohydroxylated polycyclic aromatic hydrocarbons (OHPAHs), which are metabolites of polycyclic aromatic hydrocarbons (PAHs), act on calcified tissue and suppress osteoblastic and osteoclastic activity in the scales of teleost fish. The compounds may possibly influence other calcified tissues. Thus, the present study noted the calcified spicules in sea urchins and examined the effect of both PAHs and OHPAHs on spicule formation during the embryogenesis of sea urchins. After fertilization, benz[a]anthracene (BaA) and 4-hydroxybenz[a]anthracene (4-OHBaA) were added to seawater at concentrations of 10− 8 and 10− 7 M and kept at 18 °C. The influence of the compound was given at the time of the pluteus larva. At this stage, the length of the spicule was significantly suppressed by 4-OHBaA (10− 8 and 10− 7 M). BaA (10− 7 M) decreased the length of the spicule significantly, while the length did not change with BaA (10− 8 M). The expression of mRNAs (spicule matrix protein and transcription factors) in the 4-OHBaA (10− 7 M)-treated embryos was more strongly inhibited than were those in the BaA (10− 7 M)-treated embryos. This is the first study to demonstrate that OHPAHs suppress spicule formation in sea urchins.

Effect of binary combination of some plant‐derived molluscicides with MGK‐264 or piperonyl butoxide on the reproduction of the snail Lymnaea acuminata

Abstract: The effects of sub-lethal treatments (20 and 60% of 24-h LC50) with plant-derived molluscicides Annona squamosa, acetogenins, Argemone mexicana seed and protopine, in combination (1 + 5) with MGK-264 (ENT 8184) or piperonyl butoxide on the reproduction of Lymnaea acuminata has been studied. The plant-derived molluscicides and their active molluscicidal components, protopine and acetogenins, in combination with ENT 8184 or piperonyl butoxide caused a significant reduction in the fecundity, hatchability and survival of young snails. Combination of A squamosa seed powder with piperonyl butoxide was very effective as it caused a complete arrest of snail fecundity within 24 h of treatment. Removal of the snails to fresh water after the 96-h treatments caused a significant recovery in the fecundity of L acuminata. Copyright © 2004 Society of Chemical Industry

Viscosities of Binary Liquid Mixtures of Butanol + Pentane, + Hexane, + Heptane, and + Octane at T = 298.15 K

Abstract: Kinematic viscosities ν have been measured for binary liquid mixtures of butanol (n-C4H9OH) + pentane (n-C5H12), + hexane (n-C6H14), + heptane (n-C7H16), and + octane (n-C8H18) at T = 298.15 K. Val...