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S. S. E. H. Elnashaie M. A. El-Rifai G. Ibrahim 《Applied biochemistry and biotechnology》1983,8(4):275-288
The phenomenon of multiplicity is investigated for an isothermal continu ous stirred tank reactor (CSTR) in which an enzyme
reaction producing hydrogen ions is taking place. The activity of the enzyme considered is sensitive to the hydrogen ion concentration
and is inhibited by excess substrate. The enzyme is bound and the washout phenomenon is negligible.
The investigation has uncovered a new type of hysteresis, consisting of a closed curve on the multiplicity diagram, and is
disconnected from the rest of the multiplicity curve. This phenomenon has also been observed and analyzed by Uppal et al.
(1) in their investigation of the non-isothermal, non-adiabatic (CSTR), and they have termed those closed curves “Isolas.” In
the present paper we have elucidated the physical reason for the occurrence of those “Isolas” for the enzymatic reaction under
consideration. We have also investigated the effect of different parameters on the appearance, disappearance, and size of
the “Isolas.” 相似文献
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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
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An efficient method has been developed for the synthesis of a novel series of unsymmetrically 3,3‐disubstituted oxindoles in good‐to‐high yields by a one‐pot three‐component condensation reaction of 2‐hydroxynaphthalene‐1,4‐dione, an isatin, and a barbituric acid derivative, in H2O, and with p‐toluenesulfonic acid as a catalyst, at 90°. The effects of solvent, temperature, and the amount of catalyst on the yield of the reaction have been investigated. Additionally, the influence of hydrophilicity and hydrophobicity of the reactants on the selectivity of products has been examined. 相似文献