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[Khat phenomena Yemen: a socio-economical study in Taiz and Ibb governorates]. [Arabic]
1995
Barakat M.M.
FACTORS AFFECTING THE (PRODUCTION OF EXTRACELLULAR NEUTRAL PROTEASE) BY STREPTOMYCES MICROFLAVUS
2009
Saadia, M. Hassanein | Hala M. Rifaat | Osama Hamed El-Said | Souad A. Saleh | Manal S. M. Selim
In order to produce neutral protease from Streptomyces microflavus, it was cultivated in basal medium containing soluble starch, potassium nitrate, dipotassium hydrogen phosphate, magnesium sulphate, sodium chloride, calcium carbonate and ferrous sulphate. Protease production increased with decreasing the ratio of culture broth to vessel volume 1:5 and shaking at 150 rpm. Protease production was low when pH was < 5 or > 9. The productivity of protease decreased sharply when the incubation temperature increased from 30 to 450C. The maximum yield of protease was obtained at the third day of incubation. Soluble starch and yeast extract were the best carbon and nitrogen sources, respectively. Supplementation with calcium carbonate enhanced protease production. In addition, the dipotassium hydrogen phosphate was the best phosphorous source. Para chloromercuribenzoic acid and phenyl methylsulfonylfloride had significant inhibitory effect on protease production.
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1995
Barakat, M.M. (Ain-Shams Univ., Cairo (Egypt). Faculty of Agriculture)
