• 제목/요약/키워드: Chemical laboratory

검색결과 3,573건 처리시간 0.032초

MOCVD of GaN Films on Si Substrates Using a New Single Precursor

  • Song, Seon-Mi;Lee, Sun-Sook;Yu, Seung-Ho;Chung, Taek-Mo;Kim, Chang-Gyoun;Lee, Soon-Bo;Kim, Yun-Soo
    • Bulletin of the Korean Chemical Society
    • /
    • 제24권7호
    • /
    • pp.953-956
    • /
    • 2003
  • Hexagonal GaN (h-GaN) films have been grown on Si(111) substrates by metal organic chemical vapor deposition using the azidodiethylgallium methylamine adduct, Et₂Ga(N₃)·NH₂Me, as a new single precursor. Deposition was carried out in the substrate temperature range 385-650 °C. The GaN films obtained were stoichiometric and did not contain any appreciable amounts of carbon impurities. It was also found that the GaN films deposited on Si(111) had the [0001] preferred orientation. The photoluminescence spectrum of a GaN film showed a band edge emission peak characteristic of h-GaN at 378 nm.

유해·위험물질 취급 화학실험실 관리 기준 정립 및 체계 개선에 관한 연구 (Study on Establishment of management standards of Chemistry laboratory handling harzadous substances and improvement of system)

  • 조남준;이만수
    • 대한안전경영과학회지
    • /
    • 제18권4호
    • /
    • pp.57-72
    • /
    • 2016
  • There are more than 30,000 chemical substances handled in domestic university laboratories. Among them, hazardous materials are selected and managed as designated substances by the standards of 19 Ministries and 16 Acts. However, domestic safety-related laws and regulations are used to manage industrial risk factors based on industrial activities. In case of installing a university chemical laboratory in accordance with the installation standards applicable to general workplaces. It is not suitable to use as a laboratory installation standard that can be applied to a chemical laboratory installed at a university such as a problem occurs in applying to a university using a small quantity of dangerous substances in a small amount. In order to establish the laboratory structure and facility standards that are appropriate for the laboratory characteristics and apply systematic laboratory safety, the National Security Administration shall apply the special handling standard of chemical experiment to places where handling less than 30 times the designated quantity of chemical substances for chemical experiments. On August 2, 2016, the regulations for the enforcement of the Dangerous Goods Safety Management Act and the standards for the structure and facilities of the university chemical laboratory were enacted. In this study, we investigated the domestic chemical substances laws and regulations to determine the chemical substances that are over-regulated in the relevant laws, and define them as substances against accidents. The management criteria for the substances were analyzed. The R value for the designation of the designated quantity by the concept of the space in the management standard was calculated.

Solid-phase refolding of immobilized enterokinase for fusion protein cleavage

  • Kim, Min-Young;Na, Sea-Jin;Suh, Chang-Woo;Kim, Chang-Ho;Lee, Na-Hyun;Lee, Eun-Kyu
    • 한국생물공학회:학술대회논문집
    • /
    • 한국생물공학회 2003년도 생물공학의 동향(XIII)
    • /
    • pp.555-559
    • /
    • 2003
  • EK를 고정화하기 위해 니켈 친화결합 방법과 공유 결합형 고정화 방법을 수행하였으며 니켈 친화결합이 공유 결합형 고정화보다 높은 고정화 수율과 activity를 나타냈다. 풀림과 재접힘을 이용한 효소의 활성 회복은 공유결합형 고정화가 니켈 친화결합보다 높은 결과를 나타내었다. 또한 기질의 분자량 크기에 따른 절단율의 차이가 없었으므로 레진 공극 내부로의 확산도 차이에 의한 절단반응의 차이는 없는 것으로 나타났고, 기질 종류에 따른 EK의 활성은 작은 기질이 큰 기질보다 높은 활성을 보였다.

  • PDF