排序方式: 共有48条查询结果,搜索用时 15 毫秒
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Markus-Frederik Bohn Shivender M.D. Shandilya John S. Albin Takahide Kouno Brett D. Anderson Rebecca M. McDougle Michael A. Carpenter Anurag Rathore Leah Evans Ahkillah N. Davis JingYing Zhang Yongjian Lu Mohan Somasundaran Hiroshi Matsuo Reuben S. Harris Celia A. Schiffer 《Structure (London, England : 1993)》2013,21(6):1042-1050
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Apoorva Shandilya Priya Singh Geetanjali Mishra Omkar Omkar 《Ethology : formerly Zeitschrift fur Tierpsychologie》2021,127(1):59-67
Mating and reproduction not only provide benefits but can also incur substantial costs. An increasing number of recent studies have indicated that mate searching, mating, and ejaculate production requires large amount of energy which can result in high cost to males. Here, we examine the effect of number of matings of males and mating duration on mating and reproductive success in Menochilus sexmaculatus (Coleoptera: Coccinellidae) by subjecting them to 3 consecutive matings of 30, 60, 90 min, and complete mating (a) with no interval and (b) with interval of 24 hr between the matings. The results reveal a reduction in reproductive performance for both the setup and reduction is more when mating is consecutive without gap. This shows that between subsequent matings males require time to recuperate the sperm/ejaculate. As a male engages in a greater number of matings, the time it takes to begin mating when paired with a female increases and the overall duration of mating decreases. However, frequent mating attempts made by males result in reduction in their body weight. Thus, in this ladybird beetle mating and related physiological process consume lots of energy and the body weight of males tend to decrease which further modifies their reproductive performance. The study helps us to identify the cost of mating from male's perspective and indicates that males need to rejuvenate between the matings. 相似文献
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Rajat Bajaj Pooja Rohilla Aman Prasad Ravita Ankur Shandilya Allam Srinivasa Rao 《Luminescence》2023,38(4):428-436
Samarium ion (Sm3+)-doped alkali zinc alumino borosilicate (AZABS) glass was synthesized via quick melt quench technique. Various spectroscopic studies like optical absorption, photoluminescence (PL) emission, PL excitation, temperature-dependent PL and PL decay kinetics were performed on the as prepared glass system. Under 402 nm excitation, three sharp bands at wavelengths 563, 599 and 645 nm corresponding to transitions 4G5/2 → 6H5/2, 6H7/2 and 6H9/2, respectively, can be seen in the PL emission spectra. The 0.25 mol% Sm3+ glass has the highest intensity for these emissions. The lanthanide interaction in the glass matrix is dipole–dipole in nature as was proven from Dexter's analysis. The direct bandgap of 0.25 mol% Sm3+-doped AZABS glass was calculated to be 2.88 eV. The lifetimes of the as prepared glass range from 1.93 ms for the lowest concentration of Sm3+ to 0.75 ms for the highest. From temperature dependent PL studies, the activation energy for 0.25 mol% Sm3+-doped AZABS glass was found to be 0.19 eV which shows high thermal stability of this glass. We propose to utilize these Sm3+-doped AZABS glasses for white-light emitting diodes (w-LEDs) and solid-state lighting (SSL) applications. 相似文献
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Sheetal Uppal Amit Kumar Manish Shandilya Nitika Mukhi Amit Kumar Singh Suneel Kateriya Jagreet Kaur Suman Kundu 《Analytical biochemistry》2016
Hemoglobins with diverse characteristics have been identified in all kingdoms of life. Their ubiquitous presence indicates that these proteins play important roles in physiology, though function for all hemoglobins are not yet established with certainty. Their physiological role may depend on their ability to bind ligands, which in turn is dictated by their heme chemistry. However, we have an incomplete understanding of the mechanism of ligand binding for these newly discovered hemoglobins and the measurement of their kinetic parameters depend on their coordination at the heme iron. To gain insights into their functional role, it is important to categorize the new hemoglobins into either penta- or hexa-coordinated varieties. We demonstrate that simple pH titration and absorbance measurements can determine the coordination state of heme iron atom in ferric hemoglobins, thus providing unambiguous information about the classification of new globins. This method is rapid, sensitive and requires low concentration of protein. Penta- and hexa-coordinate hemoglobins displayed distinct pH titration profiles as observed in a variety of hemoglobins. The pentacoordinate distal histidine mutant proteins of hexacoordinate hemoglobins and ligand-bound hexacoordinate forms of pentacoordinate hemoglobins reverse the pH titration profiles, thus validating the sensitivity of this spectroscopic technique. 相似文献
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Jayasha Shandilya Parijat Senapati Karthigeyan Dhanasekaran Suma S. Bangalore Manoj Kumar A. Hari Kishore Akshay Bhat Gopinath S. Kodaganur Tapas K. Kundu 《FEBS letters》2014
The functional association of NPM1 with Aurora kinases is well documented. Surprisingly, although NPM1 is a well characterized phosphoprotein, it is unknown whether it is a substrate of Aurora kinases. We have found that Aurora kinases A and B can phosphorylate NPM1 at a single serine residue, Ser125, in vitro and in vivo. Phosphorylated-S125-NPM1 (pS125-NPM1) localizes to the midbody region during late cytokinesis where it colocalizes with Aurora B. The overexpression of mutant (S125A) NPM1 resulted in the deregulation of centrosome duplication and mitotic defects possibly due to cytokinesis failure. These data suggest that Aurora kinase B-mediated phosphorylation of NPM1 plays a critical role during mitosis, which could have wider implications in oncogenesis. 相似文献