Biomedical subjects
Publications and source records attributed to D Zaki.
The wax distillate fraction (boiling range 300 up to 400 degrees C) from the crude oil "El-Alameen" was found to be a good substrate for the biosynthesis of proteins and/or amino acids by bacteria under special culture conditions. The fermentation processes were accompanied by a refining effect to the oil fraction, elevating its refraction index and lowering its melting point, giving dewaxing effect to the oil fraction.
The production of amino acids by the mutant strain, homoserine methionine deficient, of Micrococcus glutamicus, was studied through the elucidation of the role of chemical agent affecting the osmotic barriers. Penicillin was found to affect the cell wall integrity and to increase greatly the total amino acid content, especially in presence of high biotin content. Non-ionic detergents were found to affect the integrity of cytoplasmic membrane. The effect was not similar with the different types of detergents and not proportional to the increase of its concentration.
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