The RuvC protein of Escherichia coli catalyzes the resolution of recombination intermediates during genetic recombination and the recombinational repair of damaged DNA. Resolution involves specific recognition of the Holliday structure to form a complex that exhibits twofold symmetry with the DNA in an open configuration. Cleavage occurs when strands of like polarity are nicked at the sequence ...

The genus Salmonella belongs to the family of Enterobacteriaceae. In comparison to herbivorous animals dogs and cats have a higher resistence against infections with Salmonella. Under supporting circumstances infections with Salmonella are able to cause diarrhoea; vomiting and fever, also possible are septicaemia in young animals. According to the Robert-Koch Institute about 10 % of human Salmo...

background : metronidazole, as one of the most widely used antibiotics in the world, in addition to various benefits, has significant adverse effects on the environment and animals. the catalytic ozonation process is one of the most successful methods for antibiotics removal. however, it should be noted that this process, like other oxidation processes, has some byproducts that can be toxic in ...

epoxyalcohols are useful intermediates in complex organic synthesis, and recently they have been recognized as versatile intermediates for synthesis of natural products. the treatments of cis and trans 2-(1-cyclohexenyl) cyclohexanol, separately with paranirto perbenzoic acid gave the corresponding 2-(1- cyclohexenyl) cyclohexanol oxide. on the other hand, 2-cyclohexylidene cyclohexanol oxide w...

bacteriorhodopsin (br) is a retinal protein that is a light-driven proton pump and has an important role in photosynthesis in archaebacterium halobacterium salinarum. the br molecule absorbs light and photochemical changes occur in it, and different intermediates will be produced in its photochemical cycle that some of them like p and q intermediates have a long half-life. there have been many ...

Protonation of the reactive intermediates generated in the raction between dalkyl acetylenedicarboxylates and triphenylphosphine by isonitrosoacetophenone leads to vinyltriphenylphosphonium salts, which undergo intramolecular Wittig reaction to produce dalkyl 4-phenyl-N-hydroxypyrrole-2,3-dicarboxylates in moderate yields.

Bacteriorhodopsin (BR) is a retinal protein that is a light-driven proton pump and has an important role in photosynthesis in archaebacterium Halobacterium salinarum. The BR molecule absorbs light and photochemical changes occur in it, and different intermediates will be produced in its photochemical cycle that some of them like P and Q intermediates have a long half-life. There have been many ...