• Journal of the Korean Chemical Society
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• v.47 no.5
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• pp.466-471
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• 2003

The effect of polyamines on the cabbage phospholipase D(PLD) activity was investigated. The PLD activity was determined by pH-stat titration of phosphatidic acid, one of the enzymatic reaction product, using phosphatidyl choline small unilamellar vesicles as a substrate. The cabbage PLD was activated approximately 4 fold by spermine at 1 mM concentration. This spermine effect appears to be similar to the previous report on the PLD activation of rat brain mitochondrial fraction. It was also found that cationic polypetides such as polylysine and polyhistidine exerted a marked enhancement effect on the cabbage PLD. Particularly polyhistidine exerted approximately 5.5 fold enhancement effect at 0.062 mM concentration. The polyamine effect on the cabbage PLD was reexamined in the phosphatidylcholine/sodium dodecyl sulfate mixed micellar system. The relevance of polyamine effect on PLD activity is discussed in relation to the active site of PLD.

• Feed Journal
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• v.4 no.10 s.38
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• pp.78-81
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• 2006

국내 최초 순수 오징어 내장 흡착사료(SLP)개발,최초 특허 받은 추출기술로 DHA생산, 최초 미산 탈피 대두박 직수입...(주)동우산업(경상북도 포항시 남구 구룡포읍 병포리 469-9번지)에게 있어 '최초'라는 단어는 낯설지가 않다. '개발과 연구'가 기업의 경쟁력이며,'투자 없이 일궈낼 수 있는 일이란 없다'며 과감한 투자를 아끼지 않는 김철곤 회장의 경영철학 때문. 그런 (주)동우산업이 최근 어분을 대체할 수 있는 오징어 부산물을 이용한 양식사료 개발, DHA분말화 등 산업자원부 및 관내 대학과 연계, 연구를 활발히 수행해 관련 학계와 업계로 부터 주목받고 있다.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.467-470
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• 2000

이 논문에서는 대용량 3 차원 데이터를 효율적 편집과 실시간 랜더링하는 방법라 자료구조를 제안한다. 3 차원 스캐닝 데이터로부터 만들어지는 대용량 폴리곤 데이터를 사용자 인터페이스를 이용하여 실시간에 편집하기 위한 효율적인 자료·구조를 제안하고, 이를 이용한 포리곤 연산자의 구현 방법 설명하고 있다. 또한, 여기서 제안한 자료구조가 기존 edge 기반 자료구조와의 성능비교를 통해 대용량 메쉬 데이터 편집시스템에 적합한 자료구조임을 보이겠다.

• Journal of Radiation Protection and Research
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• v.1 no.1
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• pp.10-14
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• 1976

Influence of the cavity size on the response of LiF TLD was theoretically investigated for a presumed system of spherical TLD cavity imbedded in a medium of polyethylene. Calculation of the response for different radii of the spherical cavity was carried out as a function of incident photon energy, applying recent cavity theory. The range of the radii covers 1.578 to 6.528 mm, while that of the incident photon energies extends from 0.02 to 3.0 MeV. As a results, the response of the LiF TLD imbedded in a medium as a cavity was found to be functions of its own size as wall as the incident photon energy.

• The Korean Journal of Mycology
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• v.6 no.2
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• pp.1-10
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• 1978

In de novo biosynthesis of the extracellulor enzymes-proteinsaes, alpha and gluc-amylases during the synchronized differentiation of Aspergillus niger in submerged culture and surface liquid culture were investigated. Gluc-amylase was synthesized in the stage of presporulation in which phialide formation is involved. Proteinase was synthesized both in the stages of conidiophore formation and presporulation. Alpha-amylase was synthesized during presporulation and sporulation stages, the activity of enzyme lasted for seven days on surface liquid culture. It seemed that the synthesis was occured in de novo partly repressed by the catabolite, and its nature was found to be constitutive since it is produced in non-starch medium. Polyacrylamide gel electrophoresis have shown that presporulating and sporulating body produced diverse types of the proteins whereas the earlier stages of vegetative body showed simpler profiles. The uptake of C-14 uracil into RNA and C-14 glutamate into protein were shown to be vigorous in presporulating body rather than those in sporulating body. Coincidence of alpha-amylase biosynthesis in de novo and sporulation may be significant in the study of differentiation in which gene expression is involved.