geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Effects of nonpolar environments on the redox potentials of heme complexes


, : Effects of nonpolar environments on the redox potentials of heme complexes. Proceedings of the National Academy of Sciences of the United States of America 69(8): 2263-2267

A method has been described for measurement of the oxidation-reduction potentials of redox couples in nonaqueous solutions. This method has been applied to a study of the effect of a nonpolar environment on the redox potential of a heme complex. A positive potential difference of some 300 mV is observed for the measured redox potentials by comparison with reported values for the corresponding heme complex in aqueous solution. The proposal is made that the redox potentials of many high-potential cytochromes may be accounted for by a local heme environment of low-dielectric constant, characteristic of nonpolar amino-acid side chains, and that this factor may play a dominant role in the determination of the oxidation-reduction properties of these proteins.

US$29.90

PMID: 4506096


Other references

Heinz, G.J.; Richardson, R.H.; Zavala, D.C., 1978: Endobronchial foreign body removal using the bronchofiberscope. In certain situations the flexible fiberoptic bronchoscope can augment rigid bronchoscopy in foreign body removal. A case of a successful fiberoptic removal of an endobronchial foreign body (dental bridge) is presented. A wire basket, inserted thr...

Tang, H.; Lu, Y.; Wang, B-qiang.; Chen, H., 2006: The study of treatment of osteoporotic thoracolumbar multi-vertebral compressive fractures by kyphoplasty with one balloon. To evaluate the effect of kyphoplasty in treating osteoporotic thoracolumbar multi-vertebral compressive fractures with one balloon. thirteen cases (37 vertebral bodies) of osteoporotic thoracolumbar multi-vertebral compressive fractures were trea...

Mabbett, T.H., 1987: The role of copper in the growth and protection of tropical crops. The importance of copper as a micronutrient and in the control of pathogenic bacteria and fungi is discussed with relevance to crops and farming systems in Asia.

Gulyatkan, V.D., 1979: Role of light conditions in development and morphogenesis of spring rape. The peculiarities of growth and development of spring rape sown in summer in N. Kazakhstan were conditioned by its 2 responses to light conditions. The 1st response appeared in the inhibition of the transition of plants to reproductive development...

Zhang, X.C.; Scott, G.D.; Jiang, H.W., 2007: NMR probing of spin excitations in the ring structure of a two-subband system. Resistively detected nuclear magnetic resonance (NMR) is observed inside the ringlike structure, with a quantized Hall conductance of 6e(2)/h, in the phase diagram of a two-subband electron system. The NMR signal persists up to 470 mK and is absen...

Marks, H.G.; Caro, P.A.; Wang, Z.Y.; Detre, J.A.; Bogdan, A.R.; Gusnard, D.A.; Zimmerman, R.A., 1991: Use of computed tomography, magnetic resonance imaging, and localized 1H magnetic resonance spectroscopy in Canavan's disease: a case report. The neuroradiological evaluation of Canavan's disease in a 38-month-old girl is discussed. Computed tomography showed diffuse symmetrical low attenuation values of the subcortical and deep cerebral white matter. Magnetic resonance imaging dem...

Wolff J.S.; O'brien E.H.; Higdon R.C.; Harewood K.R., 1974: Inhibition of oncornavirus associated rnase with a cellular fraction from normal rat liver. Abstracts of the Annual Meeting of the American Society for Microbiology 74: 262

Yan, S.B.; Brandt, J.T.; Correll, N.L.; Um, S.L.; Bourdage, J.S., 2010: Evaluation of anti-activated protein C antibody development in patients with severe sepsis from four clinical studies with drotrecogin alpha (activated). Drotrecogin alpha (activated) (DAA) is a recombinant human activated protein C (APC), which is an antithrombotic protein. To evaluate the development of anti-APC antibodies in severe sepsis patients in DAA clinical studies. Serum and plasma sample...

Nouws J.F.M., 1974: Positive bacillus subtilis bga test allgemeiner hemmstoff test in veal calves due to release of tetracycline from the bones. Tijdschrift voor Diergeneeskunde 99(7): 378-380

Kokot, F.; Kuska, J.; Mleczko, Z.; Szczechowska, E.; Pazera, A., 1981: Relation between secretion of gastrin and calcitonin in patients with acute and chronic renal insufficiency. Fasting blood was sampled before and 60 to 240 min after the start of 4-h intravenous infusion of 10% calcium gluconate solution, 1.68 ml/kg bodyweight, before regular haemodialysis, from 18 or 14 patients, mostly men, with chronic or acute renal...