The raw phosphates in the Gafsa-Metlaoui phosphate basin are valorized by wet processes that performed laundries of Gafsa Phosphates Company (CPG, Gafsa, Tunisia) to reach market grades (>28% P2O5). This enrichment process allows increase P2O5 content elimination coarse (>2 mm) and fine (<71 µm) fractions. Mineralogical analysis has shown all investigated materials (raw phosphate, mark...

Phosphorus depletion represents a significant problem. Ash of incinerated biological sewage sludge (BSS) contains P, but the presence heavy metals (e.g., Fe and Al) is main issue. Based on chemical characterization by SEM-EDS, ED-XRF ICP-OES techniques, characteristics P content bottom ash (BA) fly (FA) BSS were very similar. On BA, extraction carried out in counter- current with an S:L ratio 1...

Heats of immersion of alkali and alkaline earth metaphosphates in some aromatic hydrocarbons were measured with a twin microcalorimeter to investigate the interaction of the interfaces between the phosphates and the hydrocarbons. The heats of immersion in benzene for the phosphates with long chains were lower than those for the phosphates with short chains. The dependence of heat of immersion o...

MagSaki software was developed for the magnetic analysis of dinuclear high-spin cobalt(II) complexes. This software performs magnetic analysis to determine magnetic parameters using several types of theoretical calculations, such as the following: (1) a mononuclear complex in an isotropic octahedral field, (2) a mononuclear complex in an axially distorted octahedral field, (3) a dinuclear compl...

The inorganic part of hard tissues (bones and teeth) of mammals consists of calcium phosphate, mainly of apatitic structure. Similarly, most undesired calcifications (i.e. those appearing as a result of various diseases) of mammals also contain calcium phosphate. For example, atherosclerosis results in blood-vessel blockage caused by a solid composite of cholesterol with calcium phosphate. Dent...

The accessibility of phosphates towards ethylnitrosourea was studied in tRNA/aminoacyl-.tRNA synthetase complexes and in the ternary aminoacyltRNA/EF-Tu/GTP complex. When the tRNA is complexed to aminoacyl-tRNA synthetases, several phosphates are protected against the alkylation agent, the protection patterns varying according to the tRNA/aminoacyl-tRNA synthetase system. However in all cases p...

1. A ribonuclease has been partially purified from the cotyledons of germinating seed of Pisum arvense. 2. The enzyme degrades ribopolynucleotides to adenosine 3'-phosphate, guanosine 3'-phosphate and the cyclic nucleotides cytidine 2',3'-phosphate and uridine 2',3'-phosphate; no resistant ;core' remains. 3. The activity of RNA-degrading enzymes in the cotyledons increases to a maximum during t...