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Clinical Application of Gold Nanoparticles for Diagnosis and Treatment
Seung-Kuk Baek 대한의학레이저학회 2021 MEDICAL LASERS Vol.10 No.2
Advances in nanobiotechnology have presented numerous possibilities of more effective diagnostic and therapeutic options. In particular, gold nanoparticles have demonstrated the potential for application in molecular imaging and treatment of cancers, including drug delivery system of certain target molecules, enhancement of radiation therapy, and photothermal treatment. This review discusses the properties, mechanism of action, and clinical application of gold nanoparticles. Although the safety of nanoparticles is yet to be ascertained, there is no doubt that in the future, nanotechnology will play an important role in the development and enhancement of a wide range of diagnostic and treatment modalities.
Baek, Youn-Kyoung,Kim, Dae Woo,Yang, Seung Bo,Lee, Jung-Goo,Kim, Young Kuk,Jung, Hee-Tae American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.2
<P>We demonstrate that chitosan prepatterns can generate not only highly periodic DNA pattern but also various types of graphitic carbon materials such as single-walled carbon nanotubes (SWNTs), graphene oxide (GO) and reduced graphene oxide (RGO). Scanning electron microscopy (SEM), fluorescence imaging and Raman spectroscopic results revealed that the graphitic carbon materials were selectively deposited on the surface of the periodic chitosan patterns by the electrostatic interaction between protonated amine groups of chitosan and the negative charged carbon materials. One proof-of-concept application of the system to the fabrication of electrical devices based on the micropatterns of SWNTs and RGO was also demonstrated. The strategy to use highly surface active chitosan pattern that can easily fabricate highly periodic pattern via a variety of lithographic tools may pave the way for the production of periodic arrays of graphitic carbon materials for large area device integration.</P>
Field gradient calculation of HTS double-pancake coils considering the slanted turns and the splice
Baek, Geonwoo,Kim, Jinsub,Lee, Woo Seung,Song, Seunghyun,Lee, Onyou,Kang, Hyoungku,Ko, Tae Kuk The Korea Institute of Applied Superconductivity a 2017 한국초전도저온공학회논문지 Vol.19 No.1
To obtain Nuclear Magnetic Resonance (NMR) measurement of membrane protein, an NMR magnet is required to generate high intensity, homogeneity, and stability of field. A High-Temperature Superconducting (HTS) magnet is a promising alternative to a conventional Low-Temperature Superconducting (LTS) NMR magnet for high field, current density, and stability margin. Conventionally, an HTS coil has been wound by several winding techniques such as Single-Pancake (SP), Double-Pancake (DP), and layer-wound. The DP winding technique has been frequently used for a large magnet because long HTS wire is generally difficult to manufacture, and maintenance of magnet is convenient. However, magnetic field generated by the slanted turns and the splice leads to field inhomogeneity in Diameter of Spherical Volume (DSV). The field inhomogeneity degrades performance of NMR spectrometer and thus effect of the slanted turns and the splice should be analyzed. In this paper, field gradient of HTS double-pancake coils considering the slanted turns and the splice was calculated using Biot-Savart law and numerical integration. The calculation results showed that magnetic field produced by the slanted turns and the splice caused significant inhomogeneity of field.
포도당 이성화 효소 생산성 신균주 Streptomyces luteogriseus의 분리 및 발효특성
홍승서,백진기,이현수,국승욱,박관화 한국산업미생물학회 1991 한국미생물·생명공학회지 Vol.19 No.3
소나무 숲 토양에서 방선균을 666주 선별한 후 이중 glucose isomerase 생산성이 우수하고(488U/㎖) 40% 포도당액의 이성화율이 53%에 도달하는 TH34균주를 선별하였다. 이 균주는 세포벽을 구성하는 diaminopimelic acid(DAP), 기균사의 색깔, spiral type의 spore 사슬의 형태, melanoid 색소형성, 탄수화물 이용성 및 전자현미경 사진 등으로 미루어 보아 Streptomyces luteogriseus로 동정하였다. 분리 동정한 S. luteogriseus의 발효조건 및 배지조성 등을 검토하여 본 결과 28∼29℃에서 효소생산이 최대이었으며 pH 6.0∼8.0의 넓은 범위에서 안정한 효소생산을 보였다. Flask 배양에서는 4일 경과 후 효소역가가 최대값을 나타내었고 5l jar fermentor에서는 30∼35hr 이후 최고 효소역가를 보였다. 한편 탄소원으로는 xylose가 가장 효과적이었으나 단독으로 사용하는 것보다 glucose와 혼합사용시 효율이 향상되었다. 질소원은 옥수수 침지수 농축액이 가장 좋았으며 7.5%에서 효소생산성이 가장 높았고 Mg^2+ 0.1%, Co^2+ 0.05%가 최적이었다. Glucose isomerase producer, which produces 488 U/㎖ of glucose isomerase activity in 500㎖ flask scale, was isolated among 666 isolates of Actinomycetes from pine forest soil samples. The isolate was identified as Streptomyces luteogriseus through the studies about morphology (spiral aerial mycelia), cell wall type (Type I), spore chains (spiral form), pigment formation (gray melanine pigment) & metabolism (sugar utilization etc). The optimum conditions of fermentation were determined in 500㎖ flask scale. The enzyme production was reached maximum after 4 days at pH 6.0∼8.0 and 27∼30℃ in the medium containing 1.5∼3.0% of xylose; 0.5∼0.8% of glucose; 0.1% of MgSO_4·7H_2O; 0.05% of CoCl_2·6H_2O; 7.5% of corn steep liquor.
백승영(Baek Seung Young),선국진(Seon Kuk Jin) 한국컴퓨터정보학회 2013 한국컴퓨터정보학회 학술발표논문집 Vol.21 No.2
본 논문은 지금까지의 다문화가정 아동들을 대상으로 한 선행연구들은 대부분 다문화가정 아동들의 사회적 심리적 요인들과 그들의 학교적응에 영향을 주는 요인들을 중심으로 연구들이 수행되어 왔다는 점에 대한 문제의식에 기초하였다. 따라서 다문화가정 아동들의 정서 행동문제에 대한 연구는 선행연구와는 달리 부모의 갈등과 양육태도, 정서 행동으로서의 내재화와 외현화 그리고 학교생활과 관련된 학교적응과 또래관계에 대해서 단편적이고 개별적인 변수들만의 관계만 고려하는 것이 아니라 종합적인 차원에서 변수들 간의 구조적인 관계에 대한 실증적인 연구의 필요성을 제시하였다.
정승원(Seung Won Chung),전현수(Hyun Su Jun),백승국(Seung Kuk Baek),정광윤(Kwang Yoon Jung) 대한두경부종양학회 2004 대한두경부 종양학회지 Vol.20 No.1
Mucinous adenocarcinoma is rarely reported in head and neck region. In other organ, it usually occur in breast, gastrointenstinal tract and so on. The specific histologic findings of mucinous adenocarcinoma are the large amount of extracellular mucin and tumor cell nests such as floating in mucin pool. It may develop rarely in major or minor salivary gland, but only one case of mucinous adenocarcinoma originating from parotid gland was presented in south korea. We report a case of mucinous adenocarcinoma in the tongue base considered to develop from minor salivary gland with a review of literatures.