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칼럼크로마토그라피에 의한 아스퍼질러스 계통의 .alpha.-아미라제 및 프로테아제의 결정화 1
서항원 한국미생물학회 1971 미생물학회지 Vol.9 No.4
Neutral protease which was obtained from a genus of Aspergilli as the crystal form were investigated for their purification and properties. The results of biochemical and enzymatic studies for their purification and properties in this enzyme were as follows. 1) On the wheat media containing 70%-water and $CaCo_{3}$, Aspergilus oryzae S.H.W. 131 is satisfactorily grown under the basic optimum conditions temperature $27^{\circ}C$- $30^{\circ}C$at relative humidity 100% for three days. 2) The enzyme solution extracted with water is successively purified through the passing on column of Asmti-177N for decolorization of it. And ion exchanger such as DEAAE Sphadex A-50 or Shepadex G-100 and fraction collector is necessary for the sepearte treatments of this enzyme. After washing it with organic solvents as aceton-EtOH, etc., it should be dried on the vacuum dryer at $40^{\circ}C$) The protease activity is determined by the amounts of amino acids, tyrosine. 4) The optimum pH of neutral protease is 6.0-8.0. 5) In effectively decomposing with this neutral protease, the optimum temperature is $35^{\circ}C$. 6) It is interesting that the amounts of metal ion affects the activity of neutral protease. For examples, if it were treated with manganic ion, its activity would be more effective than any other that.
컬럼 크로마토그라피에 의한 아스퍼질러스 계통의 $\alpha$-아미라제 및 프로테아제의 결정화 2
서항원 한국미생물학회 1972 미생물학회지 Vol.10 No.2
The studies of neutral protease which was obtained by passing through Sephadex A-50 had been reported not long ago. Since that time the author also conducted the research to be investigated the physical properties of acid protease absorbed by Sephadex A-50. The results are summarized as follows : 1) Cultivating Aspergillus oryza SHW-131 on a wheat bran medium, the acid protease including neutral protease is very sensitive for temperature. 3) Activity of acid protease is very sensitive for temeprature. 3) This enzyme was proved, what is called, to be a sort of weak acid protease. It's optimum pH was lied in about 4.5. 4) A range of pH for stability is far more narrow than any other protease. 5) The acid protease is dropped by EDTA solution in its activity.
서항원 한국미생물학회 1972 미생물학회지 Vol.10 No.3
The enzyme was produced by Asp.oryzae SHW 131. the enzymatic properties of .alpha.-amylase are following : 1) Crystallization of .alpha.-amylase is formed of longish square. 2) The range of stable pH is 5-10 and optimum ph is 5.5. 3) It is very unstable enzyme about EDTA and protection by $Ca^{++}$ ion and best activated at $50^{\circ}C$ about temperature. 4) Asp.oryzae SHW 131 produced .alpha.-amylase with acid-protease, neutral-protease and tepid-alkalin-protease.
서항원 한국미생물학회 1987 微生物과 産業 Vol.13 No.2
본고에서는 다음 몇가지 사항을 중심으로 산업계에 있어서 고급 인력 수급의 문제점및 그 해결방안에 대해 언급하고자한다. 첫째, 기업연구소및 생산종사자는 새로운 지식의 재충전을 통하여 생산현장에 적극적으로 응용하려는 자세를 가져야 한다. 둘째, 산업계에서의 인력개발은 이론과 실무를 겸비할 수 있는 방향으로 이루어져야 한다.셋째, 이제는 기업도 중장기적인 연구 개발에의 지속적인 투자를 통하여 기술혁신및 경쟁력있는 신제품개발에 전력해야 할때이다. 마지막으로 학계및 정부 출연연구소는 기업의 기초연구 부문을 지원할 필요가 있다.
한국산 Rhizopus의 효소활성에 관한 연구 (第 1 報) - Amylase, protease 및 cellulase 활성에 관하여-
이영녹,윤경하,이평우,배광승,박용근,정성균,서항원 한국미생물학회 1976 미생물학회지 Vol.14 No.2
Enzyme activities, such as glucoamylase dextrinogenic amylase, cellulase, acid protase and neutral protease, of Rhizopus isolated from various substrates collected throughout South Korea are measured, and their enzyme activities are surveyed from taxonomical, ecological and physiological viewpoint. Effect of carbon sources and phytohormones on the amylalse production of Rhizopus are also measured. Among the 735 strains of Phizopus isolated, strain number 587 exhibiting most prominent dextrinogenic amylase and netral protease activity is selected as the best strain, and the strain number 673, 108, 329, 165 and 728 are seleted for their predominant cellulase, acid protease, glucoamylase, dextrinogenic amylase and neutral protease activities, respectively. R.acidus and R.nigricans which exhibited relatively higher callulalse activity, showed lower activities for both amylase. R.tritici exhibited higher protease activity. The relations between activities and various substrates of wild strains are not outstnading difference, although the strains isolated from inland region exhibited more or less higher amylase and cellulase activities, than those of coast region, generally. Lactose and dextrin are most effective carbon sources for glucoamylase and dextrinogenic amylase production of the Rhizopus niveus, respectively. Although all phytohormones tested are effective for production of amylase by the Rhizopus strains, except nicotinamide for glucoamylase production, biotin and ascorbate are most effective for dextrinogenic amylase and glucoamylase production, respectively.