In the soil there exist cycles of biological oxidation and reduction for inorganic compounds of sulfur and nitrogen. We have been interested in the possibility that a similar cycle might exist for inorganic compounds of phosphorus. In particular, we have been interested in one step of such a cycle, that of biological oxidation of orthophosphite to orthophosphate. There are few reports in the li...

In the last few years considerable evidence has accumulated to show that the lipoid compounds of phosphoric acid of the type of lecithin are probably of great importance in the metabolism of the fats. For example a marked increase has been observed in lecithin in the blood and particularly in the corpuscles during fat absorption (1). In those pathological conditions where the blood lipoids are ...

to study the effects of mycorrhiza fungi and humic substances on yield and yield components of corn (zea mays l. var. s.c. 704) under limited irrigation condition, an experiment was conducted in split plot arrangement based on rcbd in four replications at the research farm of university of tehran (karaj-iran) in 2011. the main factor consisted of three irrigation levels i.e. normal (irrigation ...

It has been thought that phosphorus in biominerals made of amorphous calcium carbonate (ACC) might be related to ACC formation, but no such phosphorus-containing compounds have ever been identified. Crustaceans use ACC biominerals in exoskeleton and gastroliths so that they will have easy access to calcium carbonate inside the body before and after molting. We have identified phosphoenolpyruvat...

Organophosphorus compounds are important in organic chemistry. This review article covers emerging, powerful synthetic approaches to organophosphorus compounds by homolytic substitution at phosphorus with a carbon-centered radical. Phosphination reagents include diphosphines, chalcogenophosphines and stannylphosphines, which bear a weak P-heteroatom bond for homolysis. This article deals with t...

Novel germanium/phosphorus cage compounds with new structural motifs have been synthesized containing germanium in three different oxidation states. The key to obtain this new class of compounds is the use of monolithiated primary phosphine LiHPtBu in the reaction with GeX(2).

Model compounds which resemble the calcium phosphates deposited in biological systems have been synthesised, characterised by a variety of physical techniques and their EXAFS spectra recolded abo~c, the calcium K edge. The spectrum of one of the compounds, hydroxyapatite, has been ;in:~iysecl and the results used to aid the analysis of spectra from related compounds. Spectra recorded above the ...