نتایج جستجو برای: catecholase
تعداد نتایج: 91 فیلتر نتایج به سال:
Os estudos sobre enzimas têm mostrado que existe uma relação clara entre a evolução enzimática e a propriedade de promiscuidade catalítica que elas podem apresentar. Com isto, o desenvolvimento de sistemas biomiméticos capazes de atuar de modo promíscuo, de forma similar a algumas enzimas, mostrou-se um novo desafio para os químicos bioinorgânicos. Neste trabalho, reportamos a estrutura de raio...
Herein, we present three new binuclear copper(II) complexes containing different polycyclic aromatic hydrocarbons, able to catalyze the oxidation of 3,5-di-tert-butylcathecol, a model substrate for catechol oxidase. The ligands and were successful characterized in solid solution states. structure C1 was determined by X-ray crystallography it contains [CuII2(L1-?-phenoxo)(OAc)(H2O)2] unit, with ...
Transition metal complexes of Co(II), Cu(II), and Fe(II) bearing a rigid symmetrical 2,2′-(1,2-phenylene)bis(1H-benzimidazole) ligand, PhBIm2, were synthesized fully characterized by ESI-MS, FT-IR, 1H NMR (for paramagnetic species), UV–Vis spectroscopy microanalytical techniques. Besides the cobalt complex was subject X-ray structural analysis. The molecular crystal structure PhBIm2Co(II)Cl2 re...
in aggregation of some of the enzyme. This has previously been suggested to take place in the housefly, Musca vicina (Ohnishi, 1958) and the blowfly, Calliphora (Mum & Bufton, 1973). When gels of the 50 %-satd. fraction were incubated with tyrosine (0.002~) only one band of activity was discernible and this corresponded to the slowest running catecholase band (Fig. le). The result shows that th...
In the context of massive summer mortality events of the Pacific oyster Crassostrea gigas, the aim of this study was to investigate the early effects on genes, enzymes and haemocyte parameters implicated in immune defence mechanisms in C. gigas oysters exposed to a potentially hostile environment, i.e. to an herbicide alone or within a mixture. Following 2 h of exposure to the herbicide diuron ...
A recent study showed that N-acylserotonin derivatives have strong inhibitory activity against tyrosinase. To clarify the role of the 5-hydroxy group in the indole ring, 2-, 4-, 5-, 6-, and 7-hydroxyindole and 11 related compounds such as 5-hydroxyindan and 6-hydroxyquinoline were tested for their inhibition of catecholase activity of tyrosinase from human HMV-II melanoma cells. 6-Hydroxyindole...
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