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1. Determination of thermokinetic parameters of benzylpenicillin hydrolysis with metallo-β-lactamase CcrA from Bacteroides fragilis | |||
Zhou Lisheng,Zhai Le,Liu Chengcheng,Shi Ying,Zhou Yajun,Yang Kewu | |||
Chemistry 24 July 2012 | |||
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Abstract:In this paper, we report the thermokinetic parameters of benzylpenicillin (as the representative of penicillins) hydrolysis with the B1 subclasses MβL CcrA from Bacteroides fragilis. The activation free energy are 87.90±0.03, 88.99±0.01, 89.93±0.04 and 90.93±0.05 kJomol-1 at 293.15, 298.15, 303.15 and 308.15 K. Activation enthalpy is 29.21±0.03 kJomol-1, activation entropy is -200.34±0.08 Jomol-1oK-1, the reaction order is 1.4, and the apparent activation energy E is 31.71 kJomol-1. The summarized thermokinetic data indicated that CcrA prefer to hydrolyze penicillins among three kinds of β-lactam containing antibiotics. | |||
TO cite this article:Zhou Lisheng,Zhai Le,Liu Chengcheng, et al. Determination of thermokinetic parameters of benzylpenicillin hydrolysis with metallo-β-lactamase CcrA from Bacteroides fragilis[OL].[24 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4485582 |
2. The link-up of freezing temperatures of water on a plane and on an insoluble particle | |||
Shen Fanyi | |||
Chemistry 02 November 2006 | |||
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Abstract:According to the classical nucleation theory the gap between nucleation temperatures of water on an insoluble particle and on a plane has been remaining. On setting the derivative of nucleation rate formula equal to zero, the freezing temperatures of supercooling water were calculated. The results show that the size of a tiny particle will have a larger effect on nucleation temperature, which coincides with the traditional conclusion. However, when a particle is of larger radius, its surface property will play an important role. Thus, along with that the geometry of a particle is closer to a plane gradually the freezing temperature will approach to the temperature of water nucleation on a plane until two temperatures join up. Therefore, the classical theory of liquid nucleation on an insoluble particle is not far beyond the range of macro. The analysis gives former experiments a theoretical support. | |||
TO cite this article:Shen Fanyi. The link-up of freezing temperatures of water on a plane and on an insoluble particle[OL].[ 2 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9224 |
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