منابع مشابه
Photosynthetic generation of oxygen.
The oxygen in the atmosphere is derived from light-driven oxidation of water at a catalytic centre contained within a multi-subunit enzyme known as photosystem II (PSII). PSII is located in the photosynthetic membranes of plants, algae and cyanobacteria and its oxygen-evolving centre (OEC) consists of four manganese ions and a calcium ion surrounded by a highly conserved protein environment. Re...
متن کاملArchitecture of the photosynthetic oxygen-evolving center.
Photosynthesis uses light energy to drive the oxidation of water at an oxygen-evolving catalytic site within photosystem II (PSII). We report the structure of PSII of the cyanobacterium Thermosynechococcus elongatus at 3.5 angstrom resolution. We have assigned most of the amino acid residues of this 650-kilodalton dimeric multisubunit complex and refined the structure to reveal its molecular ar...
متن کاملDenitrification as influenced by photosynthetic oxygen production.
An attempt was made to detect interaction between photosynthesizing algae and denitrifying bacteria by cultivating Chlorella sp. with Pseudomonas s t u t d . Denitrification was inhibited by illumination of the mixed culture after a dark period of 3 hr. It is suggested that immediate inhibition is due to the molecular oxygen produced by the suspended algae and distributed homogeneously in the c...
متن کاملEffect of Antibiotics and/or Chemotherapy on Generation of Reactive Oxygen Intermediate by Neutrophils
Dear Editor, The O2-generating enzyme NADPH oxidase, plays a crucial role in host defense against microbial infection through the production of reactive oxygen species (ROS).1The multisubunit NADPH oxidase complex can be detected in vitro by the nitroblue tetrazolium test (NBT).2The NBT test is used for the diagnosis of chronic granulomatous disease.3 However, several factors, such as some cyto...
متن کاملReactive oxygen species generation and use of antioxidants during in vitro maturation of oocytes: a Review
In vitro maturation (IVM) is emerging as a popular technology at the forefront of fertility treatment and preservation. However, standard in vitro culture conditions usually increase reactive oxygen species (ROS), which have been implicated as one of the major causes for reduced embryonic developmental competence. It is well-known that higher than physiological levels of ROS triggers granulosa ...
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ژورنال
عنوان ژورنال: Philosophical Transactions of the Royal Society B: Biological Sciences
سال: 2008
ISSN: 0962-8436,1471-2970
DOI: 10.1098/rstb.2008.0047