• Journal of Microbiology and Biotechnology
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• 제27권11호
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• pp.2037-2043
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• 2017

The surface protein hemagglutinin (HA) mediates the attachment of influenza virus to host cells containing sialic acid and thus facilitates viral infection. Therefore, HA is considered as a good target for the development of diagnostic tools for influenza virus. Previously, we reported the isolation of single-stranded aptamers that can distinguish influenza subtype H1 from H5. In this study, we describe a method for the selective electrical detection of H1 using the isolated aptamer as a molecular probe. After immobilization of the aptamer on Si wafer, enzyme-linked immunosorbent assay (ELISA) and field emission scanning electron microscopy (FE-SEM) showed that the immobilized aptamer bound specifically to the H1 subtype but not to the H5 subtype. Assessment by cyclic voltammetry (CV) also demonstrated that the immobilized aptamer on the indium thin oxide-coated surface was specifically bound to the H1 subtype only, which was consistent with the ELISA and FE-SEM results. Further measurement of CV using various amounts of H1 subtype provided the detection limit of the immobilized aptamer, which showed that a nanomolar scale of target protein was sufficient to produce the signal. These results indicated that the selected aptamer can be an effective probe for distinguishing the subtypes of influenza viruses by monitoring current changes.

• 공업화학
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• 제20권6호
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• pp.571-580
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• 2009

실시간 측정 및 이동성이 자유로운 칩 형태의 바이오센싱 원천 기술개발은 잔류 농약 검출을 비롯하여 생 유기 물질 분석에 유용하게 활용되어 환경과학, 식품과학, 의학진단, 신약개발 등의 연구 및 응용분야에 큰 기여를 할 것으로 예상된다. 본 총설에서는 유기인계/카바메이트계 농약 검출의 중요성을 토대로 최근 개발된 광학 바이오칩 센서와 이를 통해 응용된 농약검출방법에 관련한 국내 외 기술개발 동향 및 발전가능성에 대해서 서술하고자 하며, 더 나아가 바이오칩 센서에 다양한 나노소재 및 마이크로 나노 공정 기술을 융합함으로써 소형화가 용이하고, 더욱 우수한 감도와 선택성을 갖는 유기인계/카바메이트계 농약 맞춤형 나노융합 바이오칩 센서 개발연구에 대해 논의하고자 한다.

• 폴리머
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• 제36권4호
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• pp.470-477
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• 2012

다양한 아민 그룹으로 개질된 다중벽 탄소나노튜브(이하 MWNT) 지지체를 기반으로 하여 페놀 화합물을 검출하기 위한 티로시나아제가 고정된 바이오센서를 개발하였다. 방사선 중합법을 이용하여 MWNT에 글리시딜메타크릴레이트를 중합한 후 중합 사슬의 아미노화 반응을 통해 MWNT에 다양한 아민 그룹을 도입시켰다. 이렇게 제조된 물질의 물리적, 화학적 특성은 SEM, XPS 그리고 TGA에 의해 평가되었다. 그리고 제조된 물질을 기반으로 제작된 티로시나아제가 고정화된 바이오센서의 전기화학적 특성도 평가하였다. 본 효소 바이오센서는 0.1-0.9 mM의 페놀을 검출할 수 있다. 결합효과, pH, 온도 그리고 다양한 페놀화합물에 대한 반응과 같은 여러 가지 변수에 대하여도 최적화하였고 상용 레드와인에서의 페놀화합물 검출도 연구하였다.

• KSBB Journal
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• 제22권6호
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• pp.378-386
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• 2007

바이오센싱 디바이스는 본질적으로 생체인식소재와 신호전달장치로 구성된 집적화, 소형화된 분석시스템으로 많은 장점을 가지고 있다. 고민감도, 선택도, 단순성, 다성분 측정능력, 즉시측정능력 뿐 아니라 매우 작고, 고가의 장치가 필요없는 장점이 있다. 바이오센싱 디바이스의 개발을 위해서는 두 가지의 핵심요소기술이 필요하다. 이것은 생체인식소재모듈의 제작 (리셉터 개발 및 고정화기법)과 신호발생기술을 포함한 신호전달장치의 개발이다. 효소, DNA/RNA, 단백질, 세포 등의 다양한 생체인식소재가 바이오센싱 디바이스 제작을 위해 이용되어져 왔고, 신호전달시스템도 전기화학적, 광학적, mass sensitive transducer를 중심으로 매우 활발히 연구되어져 왔다. 본 고에서는 최근 개발된 바이오센싱디바이스에 대해 다루고, 향후 전망에 대해 논하고자 한다.

• 대한수의학회지
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• 제33권4호
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• pp.605-609
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• 1993

항암치료의 조절인자로서 중요시되는 활성엽산대사물의 장간(腸肝)순환동태를 규명하기 위해 랫드에 $[^3H]pteroylglutamic$ acid(PteGlu)를 정맥주사한 후 고성능 액체 크로마토그래피법(HPLC)을 이용해 담즙중 활성대사물에 관해 조사하였다. HPLC-liquid scintillation counting법의 분석결과, 현저한 다섯개의 방사활성 피크가 출현, 이들은 $H_4PteGlu$, $10-HCO-H_4PteGlu$, $5-CH_3-H_4PteGlu$와 paraaminobenzoyl glutamate(pABG), PteGlu로 각각 동정되었다. 전자 3물질의 활성엽산대사물의 동정은 표준물질과의 비교분석에 의해 HPLC-전기화학검출기를 이용한 retention time profile 및 hydrodynamic, Voltammogram의 일치성 그리고 HPLC-photodiode array분석에 의한 흡광스펙트럼의 일치성에 근거하였다. 후자 그 물질의(pABG 및 PteGlu) 동정은 흡광스펙트럼의 일치성에 근거하였다. 랫드 담즙중$[^3H]PteGlu$의 활성엽산대사물로서 $H_4PteGlu$의 존재가 처음으로 밝혀졌다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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• pp.274-276
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• 2001

This research aims to develop the multiple channel electrochemical DNA chip using microfabrication technology. At first, we fabricated a high integration type DNA chip array by lithography technology. Several probe DNAs consisting of thiol group at their 5-end were immobilized on the sold electrodes. Then target DNAs were hybridized and reacted. Cyclic voltammetry showed a difference between target DNA and control DNA in the anodic peak current values. Therefore, it is able to detect a plural genes electrochemically after immobilization of a plural probe DNA and hybridization of non-labeling target DNA on the electrodes simultaneously. It suggested that this DNA chip could recognize the sequence specific genes.

• 한국해양공학회지
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• 제27권3호
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• pp.8-14
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• 2013

Although there are various factors that threaten the security of ships, one of the most harmful is corrosion. It is not easy to find corroding areas and the status of corrosion, even though corrosion causes serious problems such as submergence and marine pollution as a result of leaking oil and polluted water. To monitor the corrosion of ships, non-destructive inspection, weight loss coupons, electrical resistance, linear polarization resistance, zero resistance ammeter, and electrochemical impedance spectroscopy have been developed. However, these methods require much time to detect corrosion, and most are not appropriate for real time monitoring. Coating, sacrificial anode, and impressed current cathodic protection (ICCP) methods have been developed to control corrosion. The ICCP and sacrificial anode methods are the most popular ways to prevent ship corrosion. However, ICCP is only appropriate for the outside of a ship and cannot be used for complex structures such as ballast tanks because these are composed of many separate chambers. Sacrificial anodes have to be replaced periodically. This paper proposes an integrated corrosion monitoring and control system (ICMCS) that can detect corrosion in real time and is appropriate for complex structures such as ballast tanks. Because the system uses titanium for an anode, exhausted anodes do not need to be replaced.

• 한국가스학회:학술대회논문집
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• 한국가스학회 2001년도 추계학술발표회 논문집
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• pp.58-68
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• 2001

Microbiologically influenced corrosion (MIC) of carbon steel gas pipeline in soil environments was investigated at field and laboratory MIC is very severe corrosion and it is not easy to distinguish this corrosion from Inorganic corrosion because of its localized, pitting-type character Therefore, it is important to provide proper assessment techniques for the prediction, detection, monitoring and mitigation of MIC. It is possible to predict the MIC risk, i.e., the activity of sulfate-reducing bacteria (SRB) through the analysis of soil environments. Chemical, microbiological and surface analysis of corrosion products and metal attacked could reveal the possibility of the occurrence of MIC. Various electrochemical and surface analysis techniques could be used for the study of MIC. Among these techniques, thin-film electrical resistance (ER) type sensors are promising to obtain localized corrosion rate of MIC induced by SRB. It is also important to study the effect of cathodic protection (CP) on the MIC In case of coated pipeline, the relationship between coating disbondment and the activity of SRB beneath the disbanded coating is also important.

• Advances in nano research
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• 제9권2호
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• pp.113-122
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• 2020

Surface-Enhanced Raman Scattering (SERS) spectroscopy is a multifaceted surface sensitive methodology which exploits spectroscopy-based analysis for various applications. This technique is based on the massive amplification of Raman signals which were feeble previously in order to use them for appropriate identification at qualitative and quantitative in chemical as well as biological systems. This novel powerful technique can be utilized to identify pathogens such as bacteria and viruses. As far as SERS is concerned, one of the most studied problems has been functionalization of SERS active substrate. Metal colloids and nanostructures or microstructures synthesized using noble metals such as Au, Ag and Cu are considered to be SERS active. Silver and gold are extensively used as SERS active substrates due to chemical inertness and stability in air compare to copper. However, use of Cu as a suitable alternative has been taken into account as it is cheap. Herein, we have synthesized air-stable copper microstructures/nanostructures by chemical, electrochemical and microwave-assisted methods. In this paper, we have also discussed the use of as synthesized copper micro/nanostructures as inexpensive yet effective SERS active substrates for the fast identification of micro-organisms like Staphylococcus aureus and Escherichia coli.

• Journal of Biosystems Engineering
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• 제32권5호
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• pp.348-353
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• 2007

A solid state ion sensor module has been developed and evaluated for hydroponic nutrients analysis. The sensor module consisted of five ion-selective electrodes (ISE) fabricated by screen-printing technology. The electrochemical responses of ion sensors for nitrate, ammonium, potassium, calcium, and pH were measured with specially designed 7-channel low voltage signal transducers. The analytical characteristics of the sensors were comparable with those of conventional ISE sensors. The solid state ion sensors exhibit linear relationships over five concentration decades. Detection limit of the sensors were $5.6{\times}10^{-5}{\sim}1.6{\times}10^{-7}M$ depends on ions. Performance test results showed that relative errors of measured ion concentrations were less than 5% for $NO_3{^-},\;K^+,\;Ca^{2+}$ ion, and pH. The concentration of $NO_3{^-},\;NH_4{^+},\;K^+,\;Ca^{2+}$, and pH ion in standard solution and nutrient solutions could be determined by direct potentiometric measurements without any conditioning before measurements.