[(S)-16O,17O]Thiophosphoenolpyruvate has been used as a substrate in H218O for the reaction catalyzed by phosphoenolpyruvate carboxylase, and the absolute configuration of the product, inorganic [16O,17O,18O]thiophosphate, has been determined. The reaction proceeds with inversion of configuration at phosphorus, thus ruling out the cyclic mechanism that has been proposed for this enzyme. The ste...

Plasmid p15B of Escherichia coli 15T- carries a 3.5-kilobase segment that undergoes frequent DNA inversion mediated by the DNA inversion enzyme Min, a member of the Din family of site-specific recombinases. While the previously described Din inversion systems invert a DNA segment between two crossover sites in inverted orientation, the Min system produces more complex DNA rearrangements. These ...

is essentially irreversible. In free solution the reaction is slow because of spin inversion associated with the reaction of singlet reduced flavin with triplet 0, and complex, as described below. With flavoproteins the reaction with 0, may be orders of magnitude faster or slower, depending on the specific flavoprotein or the class of flavoprotein to which i t belongs. Clearly the reactivity of...

CONTEXT Lateral ankle ligamentous sprain (LAS) is one of the most common injuries in recreational activities and competitive sports. Many studies have attempted to determine whether there are certain intrinsic factors that can predict LAS. However, no consensus has been reached on the predictive intrinsic factors. OBJECTIVE To identify the intrinsic risk factors of LAS by meta-analysis from d...

Stochastic seismic inversion is a family of inversion algorithms in which the inverse solution was carried out using geostatistical simulation. In this work, a new 3D stochastic seismic inversion was developed in the MATLAB programming software. The proposed inversion algorithm is an iterative procedure that uses the principle of cross-over genetic algorithms as the global optimization techniqu...

earthquakes travel times inversion for determination of velocity structure of crust is one of the most important objectives in seismology. in the simultaneous inversion method, the parameters of earthquakes and velocity model are determined initially and are improved during inversion steps. in this study, we have used more than 22000 calculated travel times for first arrivals of 6000 earthquake...

The primary event occurring during the E-to-Z photoisomerization reaction of retinal protonated Schiff base (rPSB) is single-to-double bond inversion. In this work we examine nuclear dynamics that occurs when initial excited state a superposition S1 and S2 electronic states might be created in laser experiment. dominated by double inversion parallel to derivative coupling vector S2. Thus, molec...

Racemic 5-hydroxy-4-oxa-endo-tricyclo[5.2.1.0(2,6)]dec-8-en-3-one and its 2-methyl analogue were resolved employing a lipase-catalyzed acetylation reaction. The latter compound thus gave access to a homochiral D-ring synthon for strigolactones. The enzymatic acetylation reaction occurred with a remarkable inversion of configuration at C-5, through which it is possible to achieve a highly effici...

The title compound, C(20)H(20)N(2)S(2), was prepared by the reaction of suberic acid and 2-amino-thio-phenol under microwave irradiation. The mol-ecule lies on an inversion center.