Fixation system

Bishop, P.E. and R. Premakumar. Alternative nitrogen fixation systems. In Biological Nitrogen Fixation, G. Stacey, R.H. Burris and H.J. Evans, eds., Chapman and Hall, New York, pp. 736-762 (1992). 

MgATP hydrolysis and, 47 189-191 nitrogenase complex, 47 186-189 substrates, 47 192-202 molybdenum iron proteins, 47 161, 166-174, 176-183, 191-192 structure, 47 162-164, 166-170 nitrogen fixation role, 36 78 in nitrogen fixation systems, 27 265-266 noncomplementary reactions with Sn", 10 215... 

Bishop, P. E., and R. D. Joerger, Genetics and molecular biology of alternative nitrogen fixation systems. Annu. Rev. Plant Physiol. Plant Mol. Biol. 41 109-125, 1990. 

Bishop, P.E., Jarlenski, D.M.L., and Heatherington, D.R. (1980) Evidence for an alternative nitrogen fixation system in Azotobacter Vinilandi, Proc. Natl. Acad. Sci. USA 77, 7342-7346. 

The discovery in 1964 by Vol pin and Shur (47) of N2 reduction by (tj-CsH5)2TiCl2/RMgX mixtures (Section III,A) led several workers to postulate the intermediacy of (T -C5H5)2Ti in these dinitrogen fixation systems. 

Even though efficient enzyme-recovery and enzyme-fixation systems are available, they must be used under carefully controlled conditions in order to prevent loss of enzyme activity by accidental deviation from defined temperature and pH conditions and by bacterial contamination. 

P. E. Bishop and R. Premakumar, Alternative Nitrogen Fixation Systems, in Biological Nitrogen Fixation , eds. G. Stacey, R. H. Burris, and H. J. Evan, Chapman Hall, New York, 1992, p. 736. 

Developing a biological CO2 fixation system for culture ponds in salty water based on the treatment of flue gas from town s utility located on the Black Sea coast would provide the opportunity of using the algae crop as additional fuel to the power station. Advantages are offered by the significant solar radiation that provides a notable daily rate of CO2 fixation. 

In conclusion, the feasibility of increasing the lipid content of Neochloris sp. by nitrate depletion in the medium suggests the possibility of using this strain in a biological C02-fixation system and as a source of liquid fuels or feed in the future. 

The specificity of the complement-fixation system depends directly on the specificity of the antiserum, which should react exclusively with the gonadotropin being estimated. Butt and Lynch (B12) performed experiments designed to compare the specificity of a micro complement-fixation test with that of a radioimmunoassay for FSH. Their results demonstrated that their FSH antibody preparation cross-reacted with LH and HCG in the radioimmunoassay system, and could not be used because, when absorbed with these substances, it no longer reacted with FSH. However, with the same antiserum in the complement-fixation system, neither HCG nor LH fixed complement when present in concentrations ranging from 1 to 6000 ImU/ml, the maximum complement fixation occurring with 30 ImU FSH. It was concluded that their complement-fixation assay was specific for FSH. There are other examples in which complement fixation tests appear to be more specific than the radioimmunoassay systems (see Section 6.1.4.). This may arise from the fact that a system must be multivalent if complement is to be fixed, i.e., the antibody and antigen must have several complementary points... 

In a polymer fixation system, a liquid crystal composite in which a polymerizable component is mixed in a liquid crystal, is sealed between the substrates. The liquid crystal molecules are tilted by applying a voltage between the substrates and polymerization is started. 

Load-sharing properties of the lumbar spine stabilized with a posterior fixation system. (Reprinted with permission... 

In the case of the external fixation system, the goal might be Develop an externalfixation system, that can be quickly installed at all of the common long bone fracture sites, using as few as possible distinct elements. 

---