Báo cáo khoa học: Hydrolysis of diadenosine polyphosphates by nucleotide pyrophosphatases/phosphodiesterases ppt

... whether hydrolysis was restricted to diadenosine polyphosphates, we also analyzed the Fig. 1. Effect of divalent cations on the hydrolysis of diadenosine 5¢,5¢¢¢- P 1 ,P 3 -triphosphate (Ap 3 A) by ... specificity and are capable of hydrolyzing phosphodiester bonds of nucleotides and nucleic acids, and pyrophosphate bonds of nucleotides and nucleotide sugars, resulting in...

Ngày tải lên: 08/03/2014, 02:21

... increasing the rate of turnover by BuChE. The faster hydrolysis of F-ONA than of ONA by BuChE has been attri- buted to differences in the acetylation rate [26]. As regards the orientation of o-nitroacetanilides ... for F-ONA hydrolysis than for hydrolysis of ONA by BuChE arises from the big jump in the turnover of F-ONA (> 7500 min )1 ) as compared to that of ONA...

Ngày tải lên: 16/03/2014, 01:20

... O 2 reduction [1]. The overall outcome of the catalytic cycle is reduction of one mole- cule of dioxygen into two molecules of water, coupled with oxidation of four substrate molecules (phenols ... a variant of a M. thermophila laccase capable of resisting a wide array of co-solvents at con- centrations as high as 50% v ⁄ v [14]. In all available examples of molecular evolut...

Ngày tải lên: 18/02/2014, 06:20

... 6A). Expression of either STE20 or CLA4 from multicopy plasmids did not alter the levels of SE (Fig. 6B). A higher concentration of SE in cla4D cells could be explained by a negative regulation of Are2p ... we demonstrate that the deletion of either STE20 or CLA4 results in increased levels of sterols. In addition, higher concentrations of steryl esters, the stor- age form of...

Ngày tải lên: 18/02/2014, 13:20

... judgments of the clarity of meaning of indivi- dual sentences. The approach through testing of reading comprehension provides a direct test of at least one aspect of the quality of translation. ... according to the Friedman analysis of variance.* No practice effect is apparent for passages translated by humans. T ABLE 2 Mean Number of Errors by Order of Occurren...

Ngày tải lên: 19/02/2014, 19:20

... In general, the action of neokyotorphin in L929 cells appears be similar to that of cAMP. Results Effect of neokyotorphin in the absence of growth factors To test the ability of neokyotorphin to ... The activity of 1 lm neokyotor- phin was inhibited over the whole concentration range of H-89, confirming the involvement of PKA in the effect of neokyotorphin. As for participati...

Ngày tải lên: 07/03/2014, 11:20

... FEBS Characterization of HbpR binding by site-directed mutagenesis of its DNA-binding site and by deletion of the effector domain David Tropel 1 * and Jan R. van der Meer 1,2 1 Process of Environmental ... characterization of the HbpR binding sites of the hbpC and hbpD promoters. J Bacteriol 184, 2914– 2924. 20 Jaspers MC, Sturme M & van der Meer JR (2001) Unusual location...

Ngày tải lên: 07/03/2014, 17:20

... the prediction of the learning curve of an SMT system as a function of available in-domain parallel data, is the objective of this paper. We consider two scenarios, representative of real- istic ... within the range of the set of initial points. However, it does give a measure of the closeness of the curve fit using only the initial points with the gold fit using all the point...

Ngày tải lên: 07/03/2014, 18:20

... the regulation of apop- tosis [21,22]. Thus, the possibility that the antiviral effect of spermine is mediated by induction of apop- tosis was analyzed. For this purpose, the effect of spermine ... components of the innate host defense, which act through engagement of specific cell surface receptors and trigger the acti- vation of the janus kinase (JAK) ⁄ signal transducer and...

Ngày tải lên: 07/03/2014, 21:20

... purpose of speech recognition, is represented by a sequence of acoustic patterns each consisting of a set of measurements taken on a small portion of signal (generally on the order of 10 reset). ... utterance of fixed length the complexity is linear with the number of distinct acoustic states. Since a finite set of phonetic units is used to represent all the word...

Ngày tải lên: 08/03/2014, 07:20