Phosphoric acid combined

A nucleotide is formed when hydrogen phosphate derived from phosphoric acid combines with a sugar and nitrogen base. Several different nitrogen bases may form a nncleotide, and the hexagon is used as a general symbol for any one of these. 

Alkyl phosphates are composed of 1 mole of phosphoric acid combined with 1, 2, or 3 moles of an alcohol. For example, methanol forms three phosphate esters. 

Condensed phosphates—Substances containing phosphates characterized by the presence of the P-O-P bonds formed when phosphoric acid combines in a process called condensation. 

Elemental phosphorus is not found free in nature, except in some meteorites. Phosphorus comprises 0.12% of the Earth s crust in the form of minerals (apatite, wave-lite, viviamte), and is always present in the form of a phosphate. Phosphoric acid combines with cations to form orthophosphate salts. If not all the hydrogen contained in phosphoric acid is exchanged with a metal. 

There are three different acids to which this name may be given. If we view them as compounds containing water, then they all contain anhydrous phosphoric acid, combined in each with a different proportion of water, and their formulae will bePjO, HO P,Oj,2HO and P,05,3H0. If, on the other hand, we view them as hydrogen acids, then they contain no anhydrous phosphoric acid, but axe quite distinct compounds, and their formulae will be as follows—P,0 , H P,0 ... 

Gram scale radiolabeled syntheses of these three products were performed using a Mannich-like reaction in which phosphorous acid combines with Carbon-14 labeled formaldehyde and the particular amines required. The environmental application required several millicuries of carbon-14 radioactivity for each phosphonate at specific activities of several millicuries per millimole and high radiochemical purities. We were not successful in producing any of the final products shown in high yields but obtained mixtures containing significant amounts of what appeared to be all the possible intermediate incompletely phosphonated compounds. The separation properties of intermediates and final products were found to... 

Phosphoric acid combines rapidly at room temperatures with the oxides of Be, Mg, Ca, Sr, Ba, Zn, Cu, Mn and Pb producing both acid and neutral salts. Some of the products form hard cohesive masses which can be utilised as cements. These include cements for dental, electrical, refractory and constructional purposes (Section 12.10). 

Lewis Acid/Chiral Phosphoric Acid Combination. 172... 

Platelets and a lecithin PE mixture behaved in a similar fashion. When the negative charge of the lecithin dicetyl phosphoric acid combination was neutralized by the addition of C22-pyridinium bromide, the clotting time increased to 34 seconds. 

FTIR results, the deproteinization process was carried out satisfactorily with KOH. The use of IM phosphoric acid combined with ultrasound to obtain whiskers was the most adequate treatment to obtain fibers with lengths which are for the most part between 90 and 170 nm. 

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