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RISS 인기검색어
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- 저자 : Murahari, Prashantha (검색결과 2 건)
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Si/ZnO heterostructures for efficient diode and water-splitting applications
Mitta, Sekhar Babu,Murahari, Prashantha,Nandanapalli, Koteeswara Reddy,Mudusu, Devika,Karuppannan, Ramesh,Whang, Dongmok Elsevier 2018 International journal of hydrogen energy Vol.43 No.33
<P><B>Abstract</B></P> <P>We have developed thin zinc oxide (ZnO) layers protected highly conductive p-type silicon (Si) electrodes and investigated their diode and photoanode characteristics. ZnO layers have been deposited on the glass as well as p-Si substrates at a temperature of 400 °C by pulsed spray pyrolysis method. The crystal structure, surface morphology, and phase purity of the layers along with electrical characteristics of the heterostructures were investigated. Finally, the photocatalytic water oxidation performance of the ZnO/Si structures was studied in an alkaline electrolyte solution (pH = 10). The as-grown devices exhibited excellent diode characteristics with a turn-on voltage of 4.5 V, and applied bias-voltage dependent carrier transport mechanisms. As compared to bare Si, ZnO coated Si-based PEC devices showed good stability and durability along with very low onset potential of 0.07 V versus Ag/AgCl.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Si/ZnO heterostructures are developed and investigated. </LI> <LI> Structures possess significant diode and PEC properties. </LI> <LI> As compared to bare Si, good photoanodes stability and durability are observed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Ultrathin ZnO layers coated Si electrodes prepared by pulsed spray pyrolysis. These heterostructures exhibited excellent p-n junction diode characteristics along with good stability as well as durability as photoanodes in an alkaline electrolyte.</P> <P>[DISPLAY OMISSION]</P>
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Rajkiran Reddy Banala,Satish Kumar Vemuri,Murahari Penkulinti,Gurava Reddy AV,Subbaiah GPV 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.1
Study Design: To induce scoliosis in young female Wistar rats using a noninvasive method and to validate this model. Purpose: To induce scoliosis in a rat model noninvasively by bracing and to study the corresponding gene-expression profile in the spine and different organs. Overview of Literature: Scoliosis involves abnormal lateral curvature of the spine, the causes of which remain unclear. In the literature, it is suggested that scoliosis is genetically heterogeneous, as there are multiple factors involved directly or indirectly in its pathogenesis. Clinical and experimental studies were conducted to understand the etiology of anatomical alterations in the spine and internal organs, as the findings could help clinicians to establish new treatment approaches. Methods: Twelve female Wistar rats aged 21 days were chosen for this study. Customized braces and real-time polymerase chain reaction (RT-PCR) primers for rats were designed using Primer 3 software. Radiological analysis (X-rays), histopathological studies, SYBR green, and RT-PCR analysis were performed. Results: The spines of six rats were braced in a deformed position, which resulted in a permanent structural deformity as confirmed by X-ray studies. The remaining rats were used as controls. Quantitative studies of the expression of various genes (osteocalcin, pleiotrophins, matrix metalloproteinase-2 [MMP2] and MMP9, TIMP, interleukins 1 and 6, tumor necrosis factor-α) showed their differential expression and significant upregulation (p <0.05) in different organs of scoliotic rats in comparison to those in control rats. Histopathological findings showed tissue necrosis and fibrosis in the brain, retina, pancreas, kidney, liver, and disc of scoliotic rats. Conclusions: Bracing is a noninvasive method for inducing scoliosis in an animal model with 100% reliability and with corresponding changes in gene expression. Scoliosis does not just involve a spine deformity, but can be referred to as a systemic disease on the basis of the pathological changes observed in various internal organs.
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