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.

Soft Time Lags in the X-Ray Emission of Mrk 1040

Abstract: Temporal analysis of X-ray binaries and active galactic nuclei (AGNs) have shown that hard X-rays react to variation of soft ones after a time delay. The opposite trend, or soft lag, has only been seen in a few rare quasi-periodic oscillations in X-ray binaries and recently for the AGN 1H 0707-495, on short timescales of ~103 s. Here, we report analysis of an XMM-Newton observation of Mrk 1040, which reveals that on the dominant variability timescale of ~104 s, the source seems to exhibit soft lags. If the lags are frequency independent, they could be due to reverberation effects of a relativistically blurred reflection component responding to a varying continuum. Alternatively, they could be due to Comptonization delays in the case when high-energy photons impinge back on the soft photon source. Both models can be verified and their parameters tightly constrained, because they will need to predict the photon spectrum, rms variability, and time lag as a function of energy. A successful application of either model will provide unprecedented information on the radiative process, geometry, and more importantly the size of the system, which in turn may provide a stringent test of strong general relativistic effects.

Orthosilicic acid (OSA) reduced grain arsenic accumulation and enhanced yield by modulating the level of trace element, antioxidants, and thiols in rice

Abstract: Arsenic (As), a toxic metalloid, is finding its route to human through intake of As-contaminated water and consumption of food grown on contaminated soil. Rice is the most As-affected crop. Present study is aimed to assess the impact of stabilized orthosilicic acid (a proprietary formulation for plant-available silicon (Si) and earlier used as fertilizer for rice to enhance growth and yield) in reducing the accumulation of As in rice grains. Application of arsenic in the form of arsenate (AsV) and arsenite (AsIII) significantly affected plant growth in a dose-dependent manner. Higher doses of AsV and AsIII (50 and 25 mg L−1 respectively) significantly decreased the yield attributes leading to lower yield. A significant accumulation of As in grain was observed in both AsV- and AsIII-exposed plants in a dose-dependent manner. Arsenic exposure also increased the level of Si in rice grains. Application of Si, either in soil or on leaves (foliar), greatly reduced grain As accumulation (up to 67% in AsV and 78% in AsIII) and enhanced the growth and yield of plants under As stress. The level of thiols and activities of antioxidant enzymes were also enhanced under Si application. Foliar Si application was more effective in increasing grain Si level and reducing grain As than soil Si. The level of other trace elements was also significantly enhanced by Si application irrespective of the presence or absence of As in comparison with control. Arsenic exposure constrained some of the trace elements, such as Zn and Co, which were restored by Si application. Results of the present study showed that the application of currently used Si formulation may effectively reduce grain As level even in highly As-contaminated soil and improve grain quality of rice.

Effects of deltamethrin on serum calcium and corpuscles of Stannius of freshwater catfish, Heteropneustes fossilis.

Abstract: Catfish, Heteropneustes fossilis, were subjected to deltamethrin for short-term (96 h; 1.49 μg L−1) and long-term (28 days; 0.37 μg L−1) durations. The effects of deltamethrin exposure were evaluated on the corpuscles of Stannius (CS) of the fish, as it has been reported recently that stanniocalcin homologs are present in fish as well as in tetrapods, including human beings. Moreover, in addition to their role in mineral homeostasis, stanniocalcin proteins also play a significant role in metabolism, reproduction, and development. Serum calcium levels of deltamethrin-treated fish decreased from 48 to 96 h in the short-term, and from day 7 to day 28 in the long-term experiment. The aldehyde fuchsin-positive (AF-positive) cells of CS of deltamethrin-treated fish exhibited increased granules after 72 and 96 h. No change was noticed in the nuclear volume of AF-positive cells. The AF-negative cells of CS depicted an increased nuclear volume after 96 h of deltamethrin treatment. The AF-positive cells of CS of lo...

Toxicity of nerium indicum and euphorbia royleana lattices against culex quinquefasciatus mosquito larvae

Abstract: Different dilutions of aqueous and methanolic extracts of lattices of Nerium indicum (Apocynaceae) and Euphorbia royleana (Euphorbiaceae) were administered for 24h and 48h to the Culex quinquesfasciatus (Diptera: Culicidae) larvae in order to test their lethality. The larvicidal activity of lattices of both plants, were time and dose dependent respectively. There was a significant negative correlation between LC values and exposure periods. The result also indicates that the different dilutions of the lattices of both plants also significantly delayed the post-embryonic development of Culex larvae. Methanolic extract of N. indicum is 1.8 times more toxic than aqueous extract while in case of E. royleana , the methanolic extract was 16 times more toxic in comparison to aqueous. Key Words: Nigerian Journal of Natural Products and Medicine Vol.7 2003: 61-64

Molluscicidal Activity of Nutmeg and Mace (Myristica Fragrans Houtt.) Against the Vector Snail Lymnaea Acuminata

Abstract: The molluscicidal activity of powdered nutmeg and mace (Myristica fragrans Houtt.) against the vector snail Lymnaea acuminata was evaluated. The toxicity of both the spices was time- and dose-dependent. The toxicity of mace powder (96 h LC50 = 28.61 mgL−1) was more pronounced than that of nutmeg powder (96 h LC50 = 36.95 mgL−1). Ethanolic extracts of nutmeg and mace were more toxic than their other organic solvent extracts. The ethanolic extract of mace (24 h LC50 = 13.33 mgL−1) was more effective than the ethanolic extract of nutmeg (24 h LC50 = 18.04 mgL−1) in killing the test animals. The 96 h LC50 of column purified fraction of mace was 2.77 mgL−1 whereas that of nutmeg was 3.98 mgL−1. Nutmeg and mace may be used as potent molluscicides.