نتایج جستجو برای: soret
تعداد نتایج: 1031 فیلتر نتایج به سال:
Native ovoperoxidase exhibited an optical absorption spectrum with certain similarities to lactoperoxidase, but not horseradish peroxidase, over the pH range 4.5-11.5. Ovoperoxidase had three distinct spectral forms dependent on pH, with transitions at apparent pKa values of 6.6 and 3.0. Complexes of ovoperoxidase with CN-, N3-, F-, or when reduced and ligated to carbon monoxide, CN-, or pyridi...
complex reacted rapidly with 02-. in a catalytic manner. The rate constant for O,-* dismutation was determined by competition of the iron porphyrin with Nitro Blue Tetrazolium in a xanthine/xanthine oxidase system at pH 10.1 ; a value of 3 x ~O'M-' .s-' at 20°C was obtained. The iron porphyrin had no effect on xanthine oxidase activity. Under our reaction conditions, at least 14 molecules of Oz...
Soluble guanylate cyclase (sGC) is a heterodimeric hemoprotein that catalyzes the conversion of GTP to cGMP. Upon binding NO to its heme cofactor, purified sGC was activated 300-fold. sGC was only activated 67-fold by nitroglycerin (GTN) and Cys; and in the absence of Cys, GTN did not activate sGC. Electronic absorption spectroscopy studies showed that upon NO binding, the Soret of ferrous sGC ...
Rapid mixing of substrate-free ferric cytochrome P450(BM3)-F87G with m-chloroperoxybenzoic acid (mCPBA) resulted in the sequential formation of two high-valent intermediates. The first was spectrally similar to compound I species reported previously for P450(CAM) and CYP 119 using mCPBA as an oxidant, and it featured a low intensity Soret absorption band characterized by shoulder at 370nm. This...
The five major components of the monomeric haemoglobin from Glycera dibranchiata were separated and characterized by absorption spectroscopy, isoelectric focusing, azide-binding affinities and nitrosyl autoreduction kinetics. The differences found among the components are discussed in terms of haem-pocket variations. In addition, the Fourier-transform i.r. spectra of pooled monomeric haemoglobi...
Excitation of HbCO by a single 6-psec 530-nm pulse results in photodissociation with a first-order constant of 0.89 X 10(11) sec-1. The kinetics of photodissociation, monitored by following absorbance changes in the Soret band at 440 nm, are interpreted as corresponding to predissociation followed by a corssing into a dissociative state. Subsequent recombination of CO with the porphyrin system ...
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