Fixation, oxygen

Fixation of atmospheric oxygen and nitrogen at high-flame temperature. 

In 1965 Zapffe found that after fracture trauma local pH values decreased to 5.3-5.6. As healing took place the pH increased gradually to the normal 7-4. Another source of low local pH in vivo is the presence of crevices between components of a fixation device. A restriction of the oxygen supply to these locations can lead to pH values of about unity . 

Some of the critical enzymes in our cells are metalloproteins, large organic molecules made up of folded polymerized chains of amino acids that also include at least one metal atom. These metalloproteins are intensely studied by biochemists, because they control life and protect against disease. They have also been used to trace evolutionary paths. The d-block metals catalyze redox reactions, form components of membrane, muscle, skin, and bone, catalyze acid-base reactions, control the flow of energy and oxygen, and carry out nitrogen fixation. 

Fig. 10-13. The links between the cycling of C, N, and O2 are indicated. Total primary production is composed of two parts. The production driven by new nutrient input to the euphotic zone is called new production (Dugdale and Goering, 1967). New production is mainly in the form of the upward flux of nitrate from below but river and atmospheric input and nitrogen fixation (Karl et al, 1997) are other possible sources. Other forms of nitrogen such as nitrite, ammonia, and urea may also be important under certain situations. The "new" nitrate is used to produce plankton protoplasm and oxygen according to the RKR equation. Some of the plant material produced is respired in the euphotic zone due to the combined efforts...

An ideal renewable resource will be one that can be replenished over a relatively short timescale or is essentially limitless in supply. The latter will include solar radiation, geothermal energy, oxygen, carbon dioxide and water. Nor should production or consumption of these resources contribute to the net atmospheric burden of carbon dioxide. Advantage can be taken of the fixation of atmospheric carbon dioxide into plant material by the process of photosynthesis. 

Monny, C. and Michelson, A.M. (1982). Fixation of aromatic hv drocarbons to proteins and DNA mediated by superoxide radicals and other activated oxygen species. Biochimie 64, 451-453. 

When nitrogen and oxygen gases were present then it was possible to get fixation of nitrogen with the formation of nitrogen oxides. Molecules of nitrogen and oxygen dissociated in the cavitation bubbles to form initially NO radicals [33, 34]. 

Alex Rosenberg. Why can t you even give a reductionist explanation of the functional character of haemoglobin by appeal to considerations about lay-haemoglobin ( ) and cross-species transfer, and the role of the globin centre of nitrous oxygen fixation in. .. 

Iron 5 X 104 3 X 10 3 Oxygen transport, storage, activation and detoxification, electron transfer, nitrogen fixation, ribose reduction, etc. 

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