In enzyme-catalyzed reactions, there is not only a substrate-inducedconformational change in enzyme, but also an enzyme-induced conformational changein substrate.This "induced fit" serves to maximize the num...In enzyme-catalyzed reactions, there is not only a substrate-inducedconformational change in enzyme, but also an enzyme-induced conformational changein substrate.This "induced fit" serves to maximize the number and strength of theenzyme-substrate interaction. By means of nuclear magnetic resonance(NMR), usingcytidine 2′-, 3′- and 5′-monophosphate(2′-, 3′- and 5′-CMP) as inhibitors,Meadows et al. investigated the base orientation relative to the ribose moiety展开更多
The recent investigations on the rewettmg and film boiling of liquid flowing along a hot/heated surface are briefly reviewed and discussed.Some advanced theoretical analyses are conducted and new conclusions achieved....The recent investigations on the rewettmg and film boiling of liquid flowing along a hot/heated surface are briefly reviewed and discussed.Some advanced theoretical analyses are conducted and new conclusions achieved.These investigations describe the fundamental characteristics of liquid flow boiling and further the complicated rewetting phenomena,and have resulted in considerable insight intothe mechanism.展开更多
By means of four different kinds of two-center expansions of the free-space Green function, the generalized scattered-wave molecular-orbital theory proposed by Johnson is resolved to approach the overlapping atomic-sp...By means of four different kinds of two-center expansions of the free-space Green function, the generalized scattered-wave molecular-orbital theory proposed by Johnson is resolved to approach the overlapping atomic-sphere MSW-X_α method. The improved result for the overlapping atomic-sphere is obtained to keep the computational advantages of the well-known nonoverlapping atomlc-sphere model without involving multicenter molecular integrals.展开更多
The present study deals with the study of some Friedel-Crafts alkylating system and the accurate measurement of hyperfine coupling constants by ESR and ENDOR techniques. The results indicate that the observed ESR spec...The present study deals with the study of some Friedel-Crafts alkylating system and the accurate measurement of hyperfine coupling constants by ESR and ENDOR techniques. The results indicate that the observed ESR spectra are due to polycyclic aromatic radical cations formed from their parent hydrocarbons.It is suggested that benzyl halides produced in the Friedel-Crafts alkylating reaction undergo Scholl condensation reaction to give polycyclic aromatic hydrocarbons, which were converted into the corresponding polycyclic aromatic radical cations in the presence of aluminum chloride.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘In enzyme-catalyzed reactions, there is not only a substrate-inducedconformational change in enzyme, but also an enzyme-induced conformational changein substrate.This "induced fit" serves to maximize the number and strength of theenzyme-substrate interaction. By means of nuclear magnetic resonance(NMR), usingcytidine 2′-, 3′- and 5′-monophosphate(2′-, 3′- and 5′-CMP) as inhibitors,Meadows et al. investigated the base orientation relative to the ribose moiety
基金Project supported by the National Natural Science Foundation of Chinaalso by NSFNASA of U.S.
文摘The recent investigations on the rewettmg and film boiling of liquid flowing along a hot/heated surface are briefly reviewed and discussed.Some advanced theoretical analyses are conducted and new conclusions achieved.These investigations describe the fundamental characteristics of liquid flow boiling and further the complicated rewetting phenomena,and have resulted in considerable insight intothe mechanism.
文摘By means of four different kinds of two-center expansions of the free-space Green function, the generalized scattered-wave molecular-orbital theory proposed by Johnson is resolved to approach the overlapping atomic-sphere MSW-X_α method. The improved result for the overlapping atomic-sphere is obtained to keep the computational advantages of the well-known nonoverlapping atomlc-sphere model without involving multicenter molecular integrals.
基金Study supported by the Science and Technique Foundation of Lanzhou Branch, Academia Sinica.
文摘The present study deals with the study of some Friedel-Crafts alkylating system and the accurate measurement of hyperfine coupling constants by ESR and ENDOR techniques. The results indicate that the observed ESR spectra are due to polycyclic aromatic radical cations formed from their parent hydrocarbons.It is suggested that benzyl halides produced in the Friedel-Crafts alkylating reaction undergo Scholl condensation reaction to give polycyclic aromatic hydrocarbons, which were converted into the corresponding polycyclic aromatic radical cations in the presence of aluminum chloride.
