Phosphorus-containing molecules

Kazuyuki Y, Kenji S, Masahiro M, Junichi F, Shigeaki S (2002) Phosphorus-containing molecules and processes for production of and uses for the same, and phosphines deriving the same and processes for production of the phosphines. EP 1249455... 

Gentilhomme A, Cochez M, Ferriol M, Oget N, Mieloszynski JL. Thermal degradation of methyl methacrylate polymers functionalized by phosphorus-containing molecules. Ill Cone calorimeter experiments and investigation of residues. Polym. Degrad. Stab. 2005 88 92-97. 

The NPD is similar in design to the FID (flame ionization detector), except that the hydrogen flow rate is reduced to about 3 mL/min, and an electrically heated thermionic bead (NPD bead) is positioned near the column orifice. Nitrogen or phosphorus containing molecules exiting the column collide with the hot bead and undergo a catalytic surface chemistry reaction. The resulting ions are attracted to a collector electrode, amplified, and output to the data system. The NPD is 10-100 times more sensitive than FID. 

Humic substances might sequester organic phosphorus-containing molecules and render phosphate available only through enzymatic hydrolysis. If so, production and release of organophosphorus compounds by the microflora would gradually result in decreased phosphate availability. Biotic equilibrium would be established after increases in alkaline... 

To achieve effective char formation in hydrocarbon-like polymers, we are beginning to see combinations of phosphorus compounds with other molecules, and we are beginning to see phosphorus containing molecules combining structural elements that will induce char formation. Several recent examples of the blend approach which is really an extension of FR technology... 

Ab initio calculations of phosphorus NMR chemical shifts in the gauge including atomic orbital (GIAO) were reported for 17 phosphorus-containing molecules, among them PHJ. 

Recent developments on acidity characterization of solid acid catalysts, specifically those invoking P solid-state nuclear magnetic resonance (SSNMR) spectroscopy using phosphorus-containing molecules as probes, have been summarized. In particular, various P SSNMR approaches using trimethylphosphine, diphosphines, and trialkylphosphine oxides (R3PO) will be Introduced, and their practical applications for the characterization of important qualitative and quantitative features, namely, type, distribution, accessibility (location/proximity), concentration (amount), and strength of acid sites in various solid acids, will be illustrated. 

Key Words Solid acid catalysts. Phosphorus-containing molecules. Solid-state NMR, Acidity, chemical shift... 

Following the arguments mentioned earher, phosphorus-containing molecules, such as TMP and trialkylphosphine oxides (R3PO), should be more desirable as NMR probes. This is owing to the fact that, like H... 

Quantification of phosphorus-containing molecules using NMR spectroscopy... 

Orthophosphates are the monomers of the world of phosphate polymers. All condensed phosphates are polymers and orthophosphates are the unique single units. This means that a phosphate is any phosphorus-containing molecule in which the phosphorus atom is contained inside a tetrahedron of oxygen atoms. The oxygen atoms may be replaced by sulfur, selenium, and similar atoms to form thiophos-phates, etc. but the phosphorus atom remains caged in the tetrahedron. 

Orthophosphate is determined on the sample by method II.2.I, before and after irradiation with light of a wavelength less than 2500 A. All organic phosphorus-containing molecules are decomposed in the irradiated water to give orthophosphate. The difference between the orthophosphate contents of the irradiated and the untreated sample gives the amount of phosphorus initially in organic combinatioa... 

After DNA, the polyphosphate adenosine triphosphate (11.15), usually abbreviated to ATP, is probably the most important phosphorus-containing molecule in the body. ATP is used to drive many biochemical reactions and cellular processes that require the input of energy these include cell division and muscle contraction. 

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