• 한국미생물·생명공학회지
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• 제14권2호
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• pp.145-153
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• 1986

본 연구에서는 토양으로부터 분리한 Aspergillus 속의 한 균주가 Colubridae과 독사의 사독 주성분인 출혈독을 강하게 불찰성화 시키는 물질을 생성하므로 이 물질을 분리한 후 부분적으로 정제하여 결정이 형성됨을 확인하였다. 본 물질은 Colubridae과의 Agkistrodon bromohoffi brevicaudus, A. saxatilis, Trimersurus flavoviridis, A. acutus 사독의 출혈독을 정량적으로 불활성화 시키며, 최대 저해률은 80-90%에 이르며 실험한 대상 동물에 따라 활성차이가 다소 있음이 인정되었다. 예로서 병아리 피하반응에 있어서는 T. flavoviridis 사독을 동량의 시료로서 처리하였을 때 완전히 출혈활성이 저해되나 mouse 족도 조직내 반응에서는 사독의 8배량의 시료로서 출혈활성이 거의 저해되었다. 또 본 시료는 출혈독이 지니고 있는 치사활성에 있어서도 독량의 약 3배량의 시료에 의해서 거의 치사 활성을 저해하며, T. flavoviridis 사독의 HR-I 및 HR-II부종활성에 대해서는 본 물질의 1/2량 이상의 농도에서는 시료농도에 관계없이 약 50% 정도로 저해하는 반면 A. bromohoffi brevicaudus 전독의 부종은 거의 완전히 저해하였다. 사용 균은 2종의 항출혈성 물질을 생성하고 있음이 가면피내 반응에서 확인되었다.

• 한국안전학회지
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• 제33권1호
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• pp.54-61
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• 2018

In this study, we developed a system for information sharing and cooperation support system among the accident response organizations to enable prompt and efficient response in responding to chemical accidents. In other words, by applying mobile messenger function, it is proposed to improve the chemical accident response system that provides information necessary for accident response promptly and accurately, and facilitates bi-directional communication between accident response organizations and field responders, thereby enabling efficient and organic response. As a result of comparing the information provision time before and after the chemical accident of chemical accident response information sharing system, the ratio of processing of substance information and chemical air diffusion information within 30 minutes was improved by 8% and 32%, respectively. As a result of this study, applying the chemical accident response information sharing system to the chemical accident response is expected to contribute to the improvement of the system and the ability to cope with the accident more effectively.

• 한국물환경학회지
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• 제24권1호
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• pp.1-6
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• 2008

Biological and chemical sensors are the two most frequently used sensors to monitor the water resource. Chemical sensor is very accurate to pick up the types and to measure the concentration of the chemical substance. Drawback is that it works for just one type of chemical substance. Therefore a lot of expensive monitoring system needs to be installed to determine the safeness of the water, which costs too much expense. Biological sensor, on the contrary, can judge the degree of pollution of the water with just one monitoring system. However, it is not easy to figure out the type of contaminant with a biological sensor. In this study, an endeavor is made to identify the toxicant in the water using the shape of the chlorophyll fluorescence induction curve (FIC) from a biological monitoring system. Wem-tox values are calculated from the amount of flourescence of contaminated and reference water. Curve fitting is executed to find the representative curve of the raw data of Wem-tox values. Then the curves are digitalized at the same interval to train the neural network model. Taguchi method is used to optimize the neural network model parameters. The optimized model shows a good capacity to figure out the toxicant from FIC.

• 한국산학기술학회논문지
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• 제18권4호
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• pp.216-223
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• 2017

화학물질은 전 세계적으로 1,500만 여종 이상 상업적으로 이용되고 있을 정도로 현대사회의 필수적인 요소이다. 그러나 이러한 화학물질 중에서 국민의 건강과 환경을 위협하는 위험성을 내포하고 있는 유해화학물질이 상당수 존재한다. 과거 사례를 통해 화학사고가 발생하면 인간의 생명에 얼마나 큰 위험성을 내포하고 있는지 알 수 있다. 화학물질사고의 특성상 짧은 시간에 큰 피해로 확산할 수 있으므로, 사전에 예방하고 사고발생 후에는 즉각적이고 신속한 대응이 매우 중요하다. 이에 국내의 화학물질에 대한 법제도가 2015년 기준으로 "유해화학물질관리법"에서 "화학물질의 등록 및 평가 등에 관한 법률"과 "화학물질관리법"의 체계로 이원화되었다. 그러나 현행법상 화학물질종합정보시스템과 화학물질정보처리시스템의 구축 및 운영을 하고 있지만, 여전히 화학사고는 지속적으로 발생하고 있다. 이러한 시스템은 화학물질사고 대응시스템이라기보다는 화학물질 정보에 그 목적을 둔 종합정보시스템이기에, 실질적인 사고대응에는 한계가 존재한다. 본 연구에서는 유해화학물질의 정보관리체계, 대응관리체계 및 화학물질 관리 지원 근거에 대해 분석하고, 이를 통한 현행 화학물질관리법 등의 개정방향과 지자체별 화학물질대응시스템을 개발 운영할 수 있도록 법제도 개선방안을 제안하고자 한다.

• 한국식품과학회지
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• 제23권5호
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• pp.599-604
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• 1991

국내에 아직 연구보고된 바 없는 청국장 점질물의 이화학적 특성을 조사하기 위하여 B. natto와 B. subtilis로 발효시킨 청국장으로부터 각각 6.3%, 5.0%의 점질물을 얻었다. 이 점질물의 조단백질 함량은 모두 약 61% 정도이었으며, 점질물의 단백질 중 아미노태 질소함량은 약 32%이었고, 구성아미노산 중에는 글루탐산이, 무기질 중에는 K함량이 특히 높았다. 점질물의 점도는 5% 농도에서는 설탕 15% 용액의 점도보다도 높게 나타났다. B. natto와 B. subtilis로부터 분리한 점질물은 pH5.0과 7.0, pH5.0에서 각각 최저 투과도를 나타내었고, 280nm에서 측정한 흡광도는 각각 pH 5.5, pH 4.0과 10.5에서 최저흡광도를 나타내었다. 점질물의 fibrinolytic activity는 B. natto가 0.438 unit/mg protein, B. subtilis가 0.163 unit/mg protein이었고, $100^{\circ}C$에서 5분간 열처리하여도 효소활성이 90% 정도 유지되었으며, 30분간 열처리하였을 때도 45% 정도의 효소활성이 남아 있었다.

• Environmental Analysis Health and Toxicology
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• 제19권1호
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• pp.33-40
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• 2004

Benzoyl peroxide is a High Production Volume Chemical, which is produced about 1,371 tons/year in Korea as of 2001 survey. The substance is mainly used as initiators in polymerization, catalysts in the plastics industry, bleaching agents for flour and medication for acne vulgaris. In this study, Quantitative Structure-Activity Relationships (QSAR) are used for getting adequate information on the physical -chemical properties of this chemical. And hydrolysis in water, acute toxicity to aquatic and terrestrial organisms for benzoyl peroxide were studied. The physical -chemical properties of benzoyl peroxide were estimated as followed; vapor pressure=0.00929 Pa, Log $K_{ow}$ = 3.43, Henry's Law constant=3.54${\times}$10$^{-6}$ atm-㎥/mole at $25^{\circ}C$, the half-life of photodegradation=3 days and bioconcentration factor (BCF)=92. Hydrolysis half-life of benzoyl peroxide in water was 5.2 hr at pH 7 at $25^{\circ}C$ and according to the structure of this substance hydrolysis product was expected to benzoic acid. Benzoyl peroxide has toxic effects on the aquatic organisms. 72 hr-Er $C_{50}$ (growth rate) for algae was 0.44 mg/1.,48 hr-E $C_{50}$ for daphnia was 0.07mg/L and the 96hr-L $C_{50}$ of acute toxicity to fish was 0.24mg/L. Acute toxicity to terrestrial organisms (earth worm) of benzoyl peroxide was low (14 day-L $C_{50}$ = > 1,000 mg/kg). Although benzoyl peroxide is high toxic to aquatic organisms, the substance if not bioaccumulated because of the rapid removal by hydrolysis (half-life=5.2 hr at pH 7 at $25^{\circ}C$) and biodegradation (83% by BOD after 21 days). The toxicity observed is assumed to be due to benzoyl peroxide rather than benzoic acid, which shows much lower toxicity to aquatic organisms. One can assume that effects occur before hydrolysis takes place. From the acute toxicity value of algae, daphnia and fish, an assessment factor of 100 was used to determine the predicted no effect concentration (PNEC). The PNEC was calculated to be 0.7$\mu\textrm{g}$/L based on the 48 hr-E $C_{50}$ daphnia (0.07 mg/L). The substance shows high acute toxicity to aquatic organisms and some information indicates wide-dispersive ore of this substance. So this substance is, a candidate for further work, even if it hydrolysis rapidly and has a low bioaccumulation potential. This could lead to local concern for the aquatic environment and therefore environmental exposure assessment is recommended.

• Bulletin of the Korean Chemical Society
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• 제34권3호
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• pp.743-748
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• 2013

The temperature dependence of the partition coefficients of a neuropeptide, substance P (SP), in isotropic acidic bicelles was investigated by using a pulsed field gradient nuclear magnetic resonance diffusion technique. The addition of negatively charged dimyristoylphosphatidylserine to the neutral bicelle changed the SP partitioning a little, which implies that the hydrophobic interaction between the hydrophobic residues of SP and the acyl chains of lipid molecules is the major interaction while the electrostatic interaction is minor in SP binding in a lipid membrane. From the temperature dependence of the partition coefficients, thermodynamic functions were calculated. The partitioning of SP into the acidic bicelles is enthalpy-driven, as it is for small unilamellar vesicles and dodecylphosphocholine micelles, while peptide partitioning into a large unilamellar vesicle is entropy-driven. This may mean that the size of lipid membranes is a more important factor for peptide binding than the surface curvature and surface charge density.

• 대한화학회지
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• 제8권2호
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• pp.78-81
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• 1964

In this report, some practical problems that are concerned with the infected barley were examined. Most of the toxic substance is present in the bran. It was almost impossible to remove the toxic substance with water or methanol completly, however, we found it is effectively eliminated by soaking the whole grain with 2%, calcium hydroxide suspension for 24 hours. As a detoxifying agent, kieselguhr was very effective; the grain mixed with little amounts (0.4-0.5%) of kieselguhr may be used as an animal feed.

• 대한통합의학회지
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• 제9권3호
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• pp.79-86
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• 2021

Purpose : This study was conducted to provide fundamental data to prepare for countermeasure to protect health of workers in the dental clinics from hazardous chemical substance, and to assess effecting factors on management of Material Safety Date Sheet(MSDS) and handling of hazardous chemical substance among workers in dental clinics. Methods : This study was carried out a survey with structured self-administered questionnaire which was consisted of 7 questions about the management of MSDS, 9 questions about recognition and practice of hazardous chemical substances in dental clinics, and 7 questions about general characteristics. Total subjects of this study were 204 adult who workers in dental clinics located in Busan and Gyeng-nam province area. The collected data were analysed using the SPSS statistical package program (ver. 23.0). Results : The factor that positively affected factor on recognition and practice of hazardous chemical substances in dental clinics has experience that has been institutional health-care accreditation. The factor that positively affected the management of MSDS has experience that has been institutional health-care accreditation. Conclusion : It is necessary to prepare countermeasures such as campaign and education on cognition of general chemical substances, and also the author concern that it should be perform the education on handling of hazardous chemical substances in dental clinics for more effecting management of MSDS. In order to improve the management of MSDS and improve the awareness and safety of chemicals, it is necessary to encourage the implementation of the institutional health-care accreditation system or prepare guidelines for the management of MSDS.

• 한국안전학회지
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• 제37권2호
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• pp.10-17
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• 2022

Currently, in Korea, lower and upper tier qualifying quantities of the 97 substances requiring preparation for accidents have been designated. The information on the submission of chemical accident prevention management plan varies depending on whether the handling volume is above or below the lower or upper qualifying quantity. Because the criteria of the lower and upper qualifying quantities of substance requiring preparation for accidents are not stipulated in the Chemical Substances Control Act, this study attempted to establish a criterion through significance verification. In addition, the study investigated whether these qualifying quantities are related to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), toxic concentration endpoint, and National Fire Protection Association (NFPA). Finally, by comparing the risk categorization of the GHS, endpoint, and NFPA, it was evaluated whether the circulation-volume-based risk categorization of the substance requiring preparation for accidents that are in the top 13 is appropriate. The qualifying quantities of benzene, toluene, and sulfuric acid needed to be adjusted upward, while those of methyl alcohol and ammonia were adjusted downward from the current qualifying quantities. It is required to establish a quantified criterion that fully reflects the domestic situations in Korea and various indicators such as toxicity, physicochemical properties, and circulation volume for the qualified criterion of hazardous chemical substances. The study is expected to be helpful in establishing an efficient system by systematizing the criterion for qualifying quantity.