scholarly journals Demonstration of two 3,3'-diaminobenzidine oxidation reactions associated with photosynthetic membranes in anaerobic light-grown Rhodospirillum rubrum.

1977 ◽  
Vol 25 (11) ◽  
pp. 1264-1268 ◽  
Author(s):  
F J Stevens ◽  
H S Pankratz ◽  
R L Uffen
Keyword(s):  
Molecular Oxygen ◽  
White Light ◽  
Rhodospirillum Rubrum ◽  
Oxidation Reactions ◽  
Photosynthetic Membranes ◽  
Dependent Activity ◽  
Two Systems

Photosynthetic membranes of anaerobic light-grown Rhodospirillum rubrum oxidized 3,3'-diaminobenzidine. When glutaraldehyde-treated cells were exposed to 3,3'-diaminobenzidine in the light aerobically, the oxidation appeared to occur by two systems. One reaction was stimulated by white light and the second required molecular oxygen. The O2-dependent activity was inhibited by KCN.

Cell-free, protein-synthesizing system of photosynthetic and heterotrophic Rhodospirillum rubrum

1976 ◽  
Vol 22 (2) ◽  
pp. 304-308
Author(s):  
C. T. Chow
Keyword(s):  
Protein Synthesis ◽  
Protease Activity ◽  
Rhodospirillum Rubrum ◽  
Chemical Compounds ◽  
Protein Synthesis Inhibitors ◽  
Free Protein ◽  
Two Systems ◽  
The Difference ◽  
Vitro Protein

An active in vitro protein-synthesizing system has been developed from Rhodospirillum rubrum grown under either photosynthetic or heterotrophic conditions. A protease activity has been found in both of these systems, and this activity can be readily inactivated by treating the cells with KCl and phenylmethyl sulfonylfluoride. The difference in protein-synthesizing activity between the photosynthetic and the heterotrophic systems has been tested in regard to the requirement of various chemicals and the response to protein synthesis inhibitors or various chemical compounds. It has been concluded that only minor differences in protein-synthesizing activity exist between these two systems.

Electrochemical and spectroscopic characterization of new cobalt(II) complexes. Catalytic activity in oxidation reactions by molecular oxygen

2001 ◽  
Vol 320 (1-2) ◽  
pp. 167-171 ◽  
Author(s):  
Aurel Pui ◽  
Ioan Berdan ◽  
Irène Morgenstern-Badarau ◽  
Aurore Gref ◽  
Martine Perrée-Fauvet
Keyword(s):  
Catalytic Activity ◽  
Molecular Oxygen ◽  
Spectroscopic Characterization ◽  
Oxidation Reactions

Efficient oxidations and photooxidations with molecular oxygen using metal phthalocyanines as catalysts and photocatalysts

2004 ◽  
Vol 08 (08) ◽  
pp. 1020-1041 ◽  
Author(s):  
Dieter Wöhrle ◽  
Olga Suvorova ◽  
Robert Gerdes ◽  
Oliver Bartels ◽  
Lukasz Lapok ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Oxygen ◽  
Heterogeneous Catalysts ◽  
Ion Exchanger ◽  
Photochemical Synthesis ◽  
Low Molecular Weight ◽  
Oxidation Reactions ◽  
Metal Phthalocyanines ◽  
Catalytic Oxidations ◽  
Different Types

Metal phthalocyanines can be very efficient as catalysts and photocatalysts in oxidation reactions using molecular oxygen as oxidant. Different types of soluble low molecular weight or oligomeric and insoluble heterogeneous catalysts and photocatalysts were developed. The heterogeneous metal phthalocyanines exist either impregnated on SiO 2, Al 2 O 3, charcoal and TiO 2 or covalently and coordinatively bound on SiO 2 and organic polymers or ionically bound on an organic ion exchanger. The catalytic oxidations of toxic sulfide and thiol derivative are studied. In addition, toxic phenols were employed as substrates for the photooxidation. Heterogeneous catalysts can exhibit higher activities then low molecular weight phthalocyanines. These systems exhibit a good stability for re-use. Photooxidations are more efficient than oxidations. A Si(IV) phthalocyanine derivative on a polymer ion exchanger is most active and stable. Also some examples for photooxidations in the direction of photochemical synthesis are given.

Environmentally benign multiphase solid–liquid–gas catalysis

2020 ◽  
Vol 22 (3) ◽  
pp. 895-902
Author(s):  
Xueli Bai ◽  
Nianze Song ◽  
Liang Wen ◽  
Xin Huang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Molecular Oxygen ◽  
Environmentally Benign ◽  
Oxidation Reactions ◽  
Solid Liquid

It is significant for the environment that molecular oxygen replaces conventional heavy metal-containing or toxic oxidants to participate in oxidation reactions.

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