• Title/Summary/Keyword: molecular processes

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Theoreitica1 analysis of plasma processes in discharge excited KrF laser (방전어기 KrF 레이저의 프라즈마 프로세서 해석)

  • Choi, Boo-Yeon;Lee, Choo-His
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.505-508
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    • 1989
  • A computer simulation code of UV preionized discharge KrF laser is developed, including time dependent circuit equations, boltzmann equations, and plasma kinetic equations for various atomic and molecular species. Rate constants for electron collision processes are calculated with a boltzmann equations as a function of E/N. In this study, we studied mainly the $KrF^*$ formation process, relaxation process, and the 248nm absorption process as a function of charging voltage.

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Study of rganized Assemblies and Surfaces Using Picosecond Lasers

  • Bhattacharyya, Kankan
    • Journal of Photoscience
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    • v.6 no.3
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    • pp.123-128
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    • 1999
  • Dynamics of many ultrafast processes are markedly slowed down in various organized molecular assemblies compared to ordinary liquids. We will show that the solvation dynamics of water molecules is affected amost dramatically and is retarded by 3 ∼4 orders of magnitude in microemulsions, micells and lipids. We will also discuss how the access to fewer water molucules and the drastically altered local pH in an organized asembly affected the excited state proton transfer processes. Finally, we will show how surface second haromonic generation can be used to study the air-water surface.

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Investigation of Molecular Coupling Effects on Photothermal Properties of Polar Solutions by Thermal Lens

  • 하정현;임종태;최중길;김용록
    • Bulletin of the Korean Chemical Society
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    • v.17 no.8
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    • pp.682-685
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    • 1996
  • Photothermal properties depend on the characteristics of energy transfer processes in solution. In this study, a time-resolved single beam thermal lens experiment in various solvents is employed to investigate the energy coupling effects which govern the energy transfer processes. Interestingly, it is observed that the behaviour of the photothermal propagation in solution depends on the property of solution and the concentration of solute in a single beam thermal lens configuration. These characteristics lead us to consider the solute-solvent coupling effects as well as the solvent-solvent interactions.

Large Conformational Changes and Molecular Recognition in Signal Transduction: Calmodulin and Active Transport/Chemosensory Receptors

  • QUIOCHO, FLORANTE A.
    • Proceedings of the Korean Biophysical Society Conference
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    • 1997.07a
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    • pp.9-10
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    • 1997
  • Calmodulin: very large conformation change of helix uncoiling, hinge-bending and domain rotation. Calmodulin (CaM) is the principal Ca$\^$2+/ -dependent regulator of a variety of important eukaryotic cellular processes. In many of these processes, calmodulin activates a plethora of target enzymes, and the calmodulin-binding domains in several targets have been shown to residue in a region of about 18-residue peptide segment.(omitted)

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Emulsion Polymerization of Vinyl Acetate Using AAPH (AAPH를 이용한 아세트산비닐의 유화중합)

  • Kwak, Jin-Woo;Kim, Joon-Ho;Lyoo, Won-Seok
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.04a
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    • pp.13-16
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    • 2003
  • Vinyl acetate monomer can be polymerized through bulk, solution, emulsion, and suspension polymerization processes. However, in the preparation of PVA from bulk or solution polymerization, there are several technical limitations for obtaining high yield and high molecular weight simultaneously. Thus, the improvement of polymerization method is necessary to prepare the PVA with high yield and high molecular weight because that the difficulty in control of high viscosity and in removal of the heat of polymerization, which might lead to side reactions like branching. (omitted)

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Analysis for Scalar Mixing Characteristics using Linear Eddy Model (Linear Eddy Model을 이용한 스칼라의 혼합특성 해석)

  • Kim, Hoo-Joong;Kim, Yong-Mo;Ahn, Kook-Young
    • 한국연소학회:학술대회논문집
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    • 2004.06a
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    • pp.133-137
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    • 2004
  • The present study is focused on the small scale turbulent mixing processes in the scalar field. In order to deal with molecular mixing in turbulent flow, the linear eddy model is addressed. In each realization, the molecular mixing term is implemented deterministically, and turbulent stirring is represented by a sequence of instantaneous, statistically independent rearrangement event called by triplet map. The LEM approach is applied with relatively simple conditions. The characteristics of scalar mixing and PDF profiles are addressed in detail.

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Review of Synaptic Plasticity (시냅스 가소성에 관한 고찰)

  • Kim, Souk-Boum;Kim, Jin-Sang
    • The Journal of Korean Physical Therapy
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    • v.13 no.1
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    • pp.229-235
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    • 2001
  • Clinical interest has lately been roused by evidence that comprehension of synaptic plasticity may be based on the theoretical opinion. This paper describes perception of synaptic plasticity. Especially processes of long term potentiation(LTP) and long term depression(LTD) are discussed. Recently, it is assessed to genetical parts from development of molecular biology. Therefore this review also represents aspect of molecular events of synaptic plasticity.

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Molecular Aspects of Some Photobiological Receptors

  • Song, Pill-Soon
    • Applied Biological Chemistry
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    • v.20 no.1
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    • pp.10-25
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    • 1977
  • The photobiological receptors of phototactic, phototropic, and photomorphogenic responses of various organisms have been described in terms of spectroscopic, photophysical and photochemical properties which may be relevant in elucidating the energy transduct ion mechanism(s) in photobiology. The photoreceptors discussed include carotenoids, flavins, stentorin and phytochrome. Although the molecular modes of their photobiological action still remain largely unexplained, it is possible to suggest several primary molecul ar processes of the photoreceptors in eliciting responses of various organisms to light.

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Novel Cell-based Protease Assay System for Molecular Cell Biology and Drug Discovery

  • Hwang, Hyun-Jin;Kim, Jeong-Hee;Park, Joon-Woo;Kim, Sung-Hee;Lee, Min-Jeon;Jeong, Han-Seung;Hwang, In-Hwan
    • Proceedings of the PSK Conference
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    • 2003.10b
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    • pp.169.1-169.1
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    • 2003
  • Recently development of cell-based assay systems which are useful in molecular cell biology and drug discovery attracts significant attention. Here, we introduce a new technologies for monitoring enzyme activity and its inhibition inside living cells. Among various enzymes, proteases are important targets for studying various biological and disease-related processes such as viral infections, apoptosis and Alzheimer's disease. In this study, a sensitive cell-based protease detection system that enables direct fluorescence detection of a target protease and its inhibition inside living cells is introduced. (omitted)

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Proline Metabolism in Neurological and Psychiatric Disorders

  • Yao, Yuxiao;Han, Weiping
    • Molecules and Cells
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    • v.45 no.11
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    • pp.781-788
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    • 2022
  • Proline plays a multifaceted role in protein synthesis, redox balance, cell fate regulation, brain development, and other cellular and physiological processes. Here, we focus our review on proline metabolism in neurons, highlighting the role of dysregulated proline metabolism in neuronal dysfunction and consequently neurological and psychiatric disorders. We will discuss the association between genetic and protein function of enzymes in the proline pathway and the development of neurological and psychiatric disorders. We will conclude with a potential mechanism of proline metabolism in neuronal function and mental health.