Catalytic converter

The information from the library proved that bimetallic catalysts, with their intrinsic alloy synergism, are generally better than their mono-metallic counterparts and thereby suggested some ideas to engineer more powerful and economic alternatives substituting for the current conventional catalysts.

12p tuetuebinhan000 23-01-2025 4 2   Download

The sulfonephthalein indicator, phenol red, exhibits an unusually slow rate of oxidation by laccase fromPolipo-rus pinsitus, in spite of the fact that it is a phenol and therefore a natural substrate for this phenoloxidase enzyme. Nevertheless, after prolonged exposure to laccase (24 h) phenol red is oxidized by more than 90%.

7p tumor12 20-04-2013 40 2   Download

Tumor necrosis factor-a converting enzyme (TACE or ADAM17) is a member of the ADAM (a disintegrin and metalloproteinase) family of type I membrane proteins and mediates the ectodomain shedding of various membrane-anchored signaling and adhesion proteins. TACE is syn-thesized as an inactive zymogen, which is subsequently proteolytically processed to the catalytically active form.We have identified the proprotein-convertases PC7 and furin to be involved in maturation of TACE.

8p fptmusic 16-04-2013 39 3   Download

The Sir2 family of histone⁄protein deacetylases (sirtuins) is comprised of homologues found across all kingdoms of life. These enzymes catalyse a unique reaction in which NAD + and acetylated substrate are converted into deacetylated product, nicotinamide, and a novel metabolite O-acetyl ADP-ribose. Although the catalytic mechanism is well conserved across Sir2 family members, sirtuins display differential specificity toward acetyl-ated substrates, which translates into an expanding range of physiological functions. ...

10p fptmusic 11-04-2013 47 3   Download

Aspartic proteinases of the A1 family are widely distributed among plant species and have been purified from a variety of tissues. They are most active at acidic pH, are specifically inhibited by pepstatin A and contain two aspartic residues indispensible for catalytic activity. The three-dimensional structure of two plant aspartic proteinases has been deter-mined, sharing significant structural similarity with other known structures of mammalian aspartic proteinases.

9p dell39 03-04-2013 36 3   Download

Heat shock inducible lysyl-tRNA synthetase ofEscherichia coli(LysU) is known to be a highly efficient diadenosine 5¢,5¢¢¢-P 1 ,P 4 -tetraphosphate (Ap4A) synthase. However, we use an ion-exchange HPLC technique to demonstrate that active LysU mixtures actually have a dual catalytic activ-ity, initially producing Ap4 A from ATP, before converting that tetraphos-phate to a triphosphate.

11p inspiron33 25-03-2013 38 2   Download

Schizophyllum commune a,a-trehalose phosphorylase utilizes a glycosyl-transferase-like catalytic mechanism to convert its disaccharide substrate into a-d-glucose 1-phosphate and a-d-glucose. Recruitment of phosphate by the free enzyme inducesa,a-trehalose binding recognition and promotes the catalytic steps.

11p media19 05-03-2013 29 2   Download

Lactococcus lactisFI9078, a construct carrying a disruption of theldh gene, converted approximately 90% of glucose into lactic acid, like the parental strain MG1363. This unexpected lactate dehydrogenase activity was puri-fied, andldhB was identified as the gene encoding this protein. The activa-tion of ldhB was explained by the insertion of an IS905-like element that created a hybrid promoter in the intergenic region upstream ofldhB.

13p media19 05-03-2013 40 3   Download

Intact mitochondria isolated from Nicotiana tabacumcv. Bright Yellow 2 (TBY-2) cells can take up riboflavin via carrier-mediated systems that oper-ate at different concentration ranges and have different uptake efficiencies. Once inside mitochondria, riboflavin is converted into catalytically active cofactors, FMN and FAD, due to the existence of a mitochondrial ribofla-vin kinase (EC 2.7.1.26) and an FAD synthetase (EC 2.7.7.2).

13p vinaphone15 27-02-2013 46 2   Download