Emerging and re-emerging viral diseases

Emerging infectious diseases can be defined as infections that have either newly appeared in a population, or existed, but are rapidly increasing in incidence or geographical range. Even thought there was considerable development regarding prevention, control and elimination of some of the infectious diseases through proper use of hygiene and sanitation practices in addition to development of anti- biotics (bacteria) and vaccination, some infectious diseases remained as the leading causes of morbidity and mortality worldwide. There are many factors involved in the emergence of new infectious diseases or the re-emergence of “old” infectious diseases. Increasing global epidemiological surveillance, improving public health systems, education and research into new antibiotics and new vaccines will allow us to effectively combat the constantly renewed threat of infectious diseases. This review summarizes the work on aspects of virus emergence

Développement de biocapteurs ampérométriques à base de tyrosinase pour la détection de composés phénoliques dans des matrices agroalimentaires (thé et huile d'olive)

PERPIGNAN-BU Sciences (661362101) / SudocSudocFranceF

Hydrochloric Acid Leaching Study of Rare Earth Elements from Moroccan Phosphate

As part of the valorization of the Moroccan phosphate rock by extraction of rare earths, different experiments on natural Moroccan phosphate from the Gantour Basin (basin of phosphate in the Youssoufia area) were done in the REMATOP laboratory. The response surface methodology was used to study the effects of the influence of different parameters (acid concentration, solid/liquid ratio, duration of the reaction, stirring speed, and temperature) on the progress of the phosphate rock’s dissolution process to determine the optimal parameters for the extraction of rare earths. The analyses were made at the same time on the mineral matrix and the solutions resulting from the attack of this matrix by different concentrations of hydrochloric acid. The rare earth analyses done by the ICP-MS technique have shown an overall amount of rare earths (ΣREs) of 228.408 ppm with the existence of yttrium as the major element

Diagramme polythermique du système H2_2O-(NH4_4)2_2HPO4_4-(NH4_4)2_2SO4_4

The polythermal diagram of the ternary system H$_2$O-(NH$_4$)$_2$HPO$_4$-(NH$_4$)$_2$SO$_4$ has been completed with two isotherms obtained at –15°C and 40°C by conductimetric analysis.One eutectic and one transitional transformation have been observed at –26°C and 6°C respectively