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Yanwei Huang Yu He Howard Sheng Xia Lu Haini Dong Sudeshna Samanta Hongliang Dong Xifeng Li Duck Young Kim Ho-kwang Mao Yuzi Liu Heping Li Hong Li Lin Wang 《国家科学评论(英文版)》2019,6(2):239
Lithium titanium oxide (Li4Ti5O12, LTO), a ‘zero-strain’ anode material for lithium-ion batteries, exhibits excellent cycling performance. However, its poor conductivity highly limits its applications. Here, the structural stability and conductivity of LTO were studied using in situ high-pressure measurements and first-principles calculations. LTO underwent a pressure-induced amorphization (PIA) at 26.9 GPa. The impedance spectroscopy revealed that the conductivity of LTO improved significantly after amorphization and that the conductivity of decompressed amorphous LTO increased by an order of magnitude compared with its starting phase. Furthermore, our calculations demonstrated that the different compressibility of the LiO6 and TiO6 octahedra in the structure was crucial for the PIA. The amorphous phase promotes Li+ diffusion and enhances its ionic conductivity by providing defects for ion migration. Our results not only provide an insight into the pressure depended structural properties of a spinel-like material, but also facilitate exploration of the interplay between PIA and conductivity. 相似文献
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Samanta L Panigrahi J Bhanja S Chainy GB 《Indian journal of clinical biochemistry : IJCB》2010,25(4):393-397
The present study was designed to compare the potential of turmeric and its active principle curcumin on T3-induced oxidative stress and hyperplasia. Adult male Wistar strain rats were rendered hyperthyroid by T3 treatment (10 μg · 100 g−1 · day−1 intraperitoneal for 15 days in 0.1 mM NaOH) to induce renal hyperplasia. Another two groups were treated similarly with T3 along with either turmeric or curcumin (30 mg kg−1 body weight day−1 orally for 15 days). The results indicate that T3 induces both hypertrophy and hyperplasia in rat kidney as evidenced by increase in cell number per unit area, increased protein
content, tubular dilation and interstitial edema. These changes were accompanied by increased mitochondrial lipid peroxidation
and superoxide dismutase activity without any change in catalase activity and glutathione content suggesting an oxidative
predominance. Both turmeric and curcumin were able to restore the level of mitochondrial lipid peroxidation and superoxide
dismutase activity in the present dose schedule. T3-induced histo-pathological changes were restored with turmeric treatment whereas curcumin administration caused hypoplasia.
This may be due to lower concentration of curcumin in the whole turmeric. Thus it is hypothesized that regulation of cell
cycle in rat kidney by T3 is via reactive oxygen species and curcumin reveres the changes by scavenging them. Although the response trends are comparable
for both turmeric and curcumin, the magnitude of alteration is more in the later. Turmeric in the current dose schedule is
a safer bet than curcumin in normalizing the T3-induced hyperplasia may be due to the lower concentration of the active principle in the whole spice. 相似文献
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Anunay Samanta 《Resonance》2007,12(7):79-85
4-(N,N-dimethylamino)benzonitrile, popularly known as DMABN, has received tremendous attention for nearly five decades. In
this article, we outline some of the features of the molecule that have made it such an interesting system to study, such
as fluorescence emission in two wavelengths. The article also highlights how limited our understanding of the excited state
structure of a small molecule like DMABN is, despite the availability of various resources to investigate it.
Anunay Samanta is a professor of chemistry at the University of Hyderabad. Mainly he is interested in photophysics and time-resolved
spectroscopy. Design of fluorosensors and study of photophysical response of molecular systems in ionic liquids are two of
his current research topics of interest. 相似文献
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Metagenomics is a robust, interdisciplinary approach for studying microbial community composition, function, and dynamics. It typically involves a core of molecular biology, microbiology, ecology, statistics, and computational biology. Exciting outcomes anticipated from these studies include unraveling of complex interactions that characterize the ecological milieu of microbial communities. Diverse habitats from which metagenomes have been reported include human guts, caterpillar guts, thermal vents in oceans, ore deposits, polar caps, and even soils that adhere to plant roots. Knowledge generated from metagenomic projects has tremendous potential to beneflt human health, agriculture, and ecosystem functions. This article provides a brief history of technical advances in metagenomics, including DNA sequencing methods, and some case studies. A speciflc example is provided of microbial metagenomes found at the roots of native grass species (family Poaceae) that can grow on degraded lands undergoing revegetation. 相似文献
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The symbiotic association between plant and fungi (mycorrhizal association) is an amazing phenomenon observed in nature. The mycorrhizal association is one of nature’s boons for sustainable agriculture. In today’s changing environment, indiscriminate use of pesticides and chemicals pose a great threat to the existence of mycorrhizal species. There is a need to spread awareness in order to save mycorrhizal fungi from extinction. 相似文献
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