Isolation of Ribonuclease2 gene from cDNA of Panax ginseng C.A. Meyer

Rama Krishna Pulla,Myung Kyung Kim,Yu-Jin Kim,Kalai Selvi,Deok-Chun Yang 고려인삼학회 2008 고려인삼학회 학술대회 Vol.2008 No.12

2LN-2 Fabrication of g-C3N4-Au-Metal Oxide Nanocomposites for High Performance Visible Photocatalytic Hydrogen Evolution Reaction

( Rama Krishna Chava ),이재형,강미숙 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

Photocatalytic hydrogen evolution from water provides a direct method to capture and store sunlight as chemical energy, which can then be released in an environmentally friendly energy cycle. Among widely investigated photocatalysts, g-C₃N₄ (CN) has attracted great attention because of its suitable band gap (2.7 eV) and favorable chemical stability. However, poor visible-light absorption (<470 nm) and high photogenerated charge recombination limit its practical applications. Therefore, it is much meaningful to develop feasible strategies to enhance the visible-light absorption and charge separation for improving photocatalytic activity of CN. In our work, we have studied the surface plasmon resonance effect of Au nanoparticles with the coupled metal oxide and which has a great potential to promote the photocatalytic activity of CN by extending the visible light absorption and improving the charge separation.

1P-426 Integration of hierarchical MoS₂ nanospheres on 1-D CdS nanorods for enhanced visible photocatalytic H₂ evolution

( Rama Krishna Chava ),도정연,강미숙 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

Despite of tremendous efforts, the development of cost effective, highly efficient and more stable visible photocatalysts for splitting of water remains a great challenge. Here, we report the heteronanostructures consisting of 3D shaped hierarchical MoS₂ nanospheres grown on CdS nanorods referred to as CdS-MoS₂ HNSs as a high performance visible photocatalyst for H₂ evolution prepared by two-step hydrothermal process. The as-synthesized CdS-MoS₂ HNSs exhibited remarkably enhanced H₂ evolution activity when compared to pure CdS nanorods. This enhanced hydrogen evolution performance can be assigned to the positive synergetic effect from heteronanostructures formed between the CdS and MoS₂ components and the related phenomena were studied.

Identity as Nidus: A Polyphonic Reading of Joseph Heller`s Good as Gold

( Rama Alapati ) 서울대학교 미국학연구소 2016 미국학 Vol.39 No.1

Joseph Heller is acknowledged as one of the prominent writers of twentieth century. His works have received great critical acclaim for his engaging response to the socio-economic-political events of the postwar period. As such, his works have become profound transcripts of a life and a vision that had lost its ideals. Also, he provides a satirical commentary of life through his novels which focus on the erosion of humanistic values and the ways in which language obscures and confuses reality. The present study attempts to analyze Heller’s Good as Gold (1979), through the lens of Mikhail Bakhtin’s theory of polyphony, which offers a rich exploration of the multiple voices of the text. At other end of the spectrum, the novel deals with the issue of identity and the desire to succeed in a situation where modern man is caught within the powerful tentacles of the society.

ON REDUCTION OF GTP TUNNELS FOR MBMS DATA TRANSFER IN UMTS

Rama Mohan Babu K N,K.N.Balasubramanya Murthy,A Srinivas,Mahesh Kumar BM 보안공학연구지원센터 2011 International Journal of Future Generation Communi Vol.4 No.1

Ag₂S quantum dot-modified ZnO NP photoanodes for photovoltaic devices

( Rama Krishna Chava ),강미숙 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Semiconductor quantum dot-sensitized solar cells (QDSSCs) technology has attracted considerable interest for solar energy harvesting and conversion efficiency. The concept of QDSSCs is similar to that of dye sensitized solar cells (DSSCs) but with the molecular dye replaced by a chalcogenide semiconductor quantum dots. The semiconductor quantum dots have two unique advantages. The band gap of the QDs can be tailored by changing the size of the QDs, allowing one to tune the visible response of the QDs. Second, the QDs can generate multiple electron-hole pairs per photon through the impact ionization effect. Ag₂S is a promising photosensitizer for QDSSCs in photovoltaic cells due to its bandgap of ~1.0 eV and relatively high absorption coefficients. In this work, we report an investigation of ZnO NPs modified with Ag₂S QDs and their performance in QDSSCs. A comparison of the properties between pure ZnO NPs and Ag₂S QD-sensitized ZnO NPs is also investigated.

Comparative Study on Convective and Microwave-Assisted Heating of Zeolite-Monoethanol-amine Adsorbent Impregnation Process for CO₂ Adsorption

( Rama Oktavian ),( Bambang Poerwadi ),( Kristian Pardede ),( Zuh Rotul Aulia ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.2

Adsorption is the most promising technology used to adsorb CO₂ to reduce its concentration in the atmosphere due to its functional effectiveness. Various porous materials have been extensively synthesized to boost CO₂ adsorption efficiency, for example, zeolite. Here, we report the synthesis process of zeolite adsorbent impregnated with amine, combining the benefit of these two substances. We compared conventional heating with microwave-assisted heating by varying concentrations of monoethanolamine in methanol (10% v/v and 40% v/v) as a liquid solution. The results showed that monoethanolamine impregnation helps significantly increase adsorption capacity, where adsorption occurs as a physisorption and not as chemisorption due to the adsorbent’s steric hindrance effect. The highest adsorption capacity of 0.3649 mmol CO₂ / gram adsorbent was reached by microwave exposure for 10 minutes. This work also reveals that a decrease in CO₂ adsorption capacity was observed at a longer exposure period, and it reached a constant 40-minute adsorption rate. Impregnating activated zeolite with 40% monoethanolamine for 10 minutes in addition to microwave exposure (0.8973 mmol CO₂ / gram adsorbent) is the maximum adsorption ability achieved.

Fabrication of a Cell Chip for the Detection of Environmental Toxicity on Neurite Growth of PC-12 Cell

Rama Bhusal,Cheol-Heon Yea,Waleed Ahmed El-Said,Il Keun Kwon,Ji Young Lee,Jeong-Woo Choi 한국생물공학회 2008 한국생물공학회 학술대회 Vol.2008 No.10

Rational design of forest-like nickel sulfide hierarchical architectures with ultrahigh areal capacity as a binder-free cathode material for hybrid supercapacitors

Rama Raju, G. Seeta,Pavitra, E.,Nagaraju, Goli,Sekhar, S. Chandra,Ghoreishian, Seyed Majid,Kwak, Cheol Hwan,Yu, Jae Su,Huh, Yun Suk,Han, Young-Kyu The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.27

<P>Evolution of a simple, efficient and reproducible strategy for the rational design of hierarchically structured metal chalcogenide-based supercapacitors has attracted considerable research interest in recent years. Herein, a facile wet-chemistry approach is employed to design three-dimensional forest-like porous nickel sulfide nanotrees on nickel foam (NiS NTs/Ni foam) for use as a cathode material in hybrid supercapacitors. The growth time plays a crucial role in controlling the surface morphology, and the optimal growth conditions (3 h at 85 °C) led to the growth of forest-like NiS NTs/Ni foam with reliable adherence. The forest-like NiS NTs/Ni foam shows maximum areal and specific capacities of 752.71 μA h cm<SUP>−2</SUP> and 342.1 mA h g<SUP>−1</SUP> at a current density of 4 mA cm<SUP>−2</SUP>, with an excellent cycling stability of 89.4%. This result is primarily due to the availability of more surface-active sites in the well-defined hierarchical architecture, which allow the rapid diffusion of electrolyte ions and minimize the electron transport limitation. Utilizing the hierarchical NiS NTs/Ni foam as a cathode and activated carbon-based anode, we further fabricated a hybrid supercapacitor, which demonstrates a wide potential window of 1.6 V with high areal energy and power densities of 0.472 mW h cm<SUP>−2</SUP> and 21.5 mW cm<SUP>−2</SUP>, respectively. The fabricated hybrid supercapacitor is successfully utilized to drive various electronic gadgets for real-life applications. The electrochemical performance of a hierarchically structured NiS-based binder-free electrode with our facile approach paves a new pathway for the development of novel metal chalcogenides for high-performance hybrid supercapacitors.</P>

STRONG MEDECINE: CONFLICT OF INTERESTS AND PHARMACEUTICAL MARKETING PRACTICES

Rama Jayanti 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.8

The contrasting discourses in the marketing and medical literature on pharmaceutical marketing practices motivate this study. Of particular interest is detailing and related practices which involve deploying pharmaceutical sales representatives (PSRs) to interact with physicians often for providing product information and benefits (Manchanda and Chintagunta, 2004; Mizik and Jacobson, 2004). Acutely aware that a dominant effect of detailing on physician’s prescription choices is problematic, Gonul et al. (p. 90) summarize the marketing literature by noting that, “there are no reasons for public concern regarding the social implications of the reviewed personal selling practice employed by drug manufacturers because its effect is mostly informative.” By contrast, taking a combative and aversive view of PSRs, leading medical scholars and practitioners recommend strict sequestration of commercial interests of industry from the physician (Steinman, et al. 2006). Major medical centers including Yale, Harvard, Duke, Stanford, University of Pennsylvania, Henry Ford Health System, and UCLA have banned physicians from receiving monetary or non-monetary gifts, and PSRs from visiting patient care areas. Prestigious medical journals such as The British Medical Journal and Journal of American Medical Association, along with International Committee of Medical Journal Editors and World Association of Medical Editors, now require all authors to include an explicit disclosure of industry sponsored research and, in some cases, to conduct independent statistical analysis as a condition for publication (DeAngelis, 2006). Using public documents from a recent court case, I analyzed pharmaceutical industry’s marketing practices and their role in creating externalities that compromise trust and fiduciary responsibility governing physician-patient relationship. Results indicate that externalities are complicit in exploiting COI and undermining consumer welfare in medical markets. Our study contributes to the research into, and practice of pharmaceutical marketing practices for interacting with physicians in several ways. First, I develop a conceptual framework based on COI theory that has substantially informed the medical profession’s discourse but received minimal, if any, attention in the marketing literature (Moore, Cain, Loewenstein, & Bazerman, 2005). This framework posits an embedded view of physician exchanges that presents new insights that have heretofore remained unexplored in the marketing literature. Second, building on the COI framework, I outline an orchestration thesis that reliably represents the medical profession’s guiding approach for seeking and evaluating evidence relating to industry’s marketing practices. Unlike the marketing literature’s interest in examining the efficiency and effectiveness of different marketing instruments such as detailing and journal publishing, the orchestration thesis focuses on strategic intent that underlies all marketing instruments. As such, the orchestration thesis offers a competing perspective that challenges the evidence in the marketing literature. Third, using a novel approach based on systematic analysis of court documents, I examine the support, if any, for the orchestration thesis in a specific contextual setting. Finally, the current study builds the conceptual and empirical foundation to bridge the marketing and medical literatures. Such a bridge is critical in developing a common ground for reconciling disparate viewpoints and redirecting marketing practices.