Phosphorus labile forms

Grunwald, S., R. Corstanje, B. E. Weinrich, and K. R. Reddy. 2006a. Spatial patterns of labile forms of phosphorus in a subtropical wetland 10 years after a sustained nutrient impact. J. Environ. Qual. 35 378-389. 

Dominant forms of V(V) are H2VOT and F1V04 at pH 7, analogous to those of P(V). However, V(V) species are more labile and relatively easily interconvertable. Vanadium also has a rich redox chemistry which is missing with phosphorus. 

Each tubulin dimer binds one molecule of GTP strongly in the a subunit and a second molecule of GTP or GDP more loosely in the P subunit. In this respect, tubulin resembles actin, whose subunits are about the same size. However, there is little sequence similarity. Labile microtubules of cytoplasm can be formed or disassembled very rapidly. GTP is essential for the fast growth of these microtubules and is hydrolyzed to GDP in the process.320 However, nonhydro-lyzable analogs of GTP, such as the one containing the linkage P-CH2-P between the terminal and central phosphorus atoms of the GTP, also support polymerization.321 Since microtubules have a distinct polarity, the two ends have different tubulin surfaces exposed, and polymerization and depolymerization can occur at different rates at the two ends. As a consequence, microtubules often grow at one end and disassemble... 

III. ORGANIC FORMS OF LIMITING ELEMENT (LABILE DISSOLVED ORGANIC NITROGEN AND DISSOLVED ORGANIC PHOSPHORUS)... 

R and RM are usually methyl, ethyl or the corresponding alkoxyl groups. R may be an alphatic or cyclic moiety forming a labile bond with phosphorus (P). 

According to reaction (a) mixed substituted platinum(0)complexes of the hitherto unknown type Ptl L1 and PtLL 2 (where L and L are phosphorus ligands) can be isolated and characterized by nmr spectroscopy. Instead of Ph3P other R3P derivatives and Ph3As can be used. Complex D is very labile. IR data give evidence for a a-coordination of the CS2ligands. With the double ylide RR N-P(S)=NR (reaction (c) ) the four-membered chelate complex E with pentavalent phosphorus of coordination number four is formed. Compound F is an example of the well characterized alkyne complexes (here with the phospha(III)azene ligand L). 

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