Abstract: This invention relates to chemical products of general formula ##STR1## wherein R is an amino group, mono or bi-hydroxyalkyl substituted, or a thio group, mono hydroxyalkyl substituted, in which one or more of the available --OH groups have been esterified with acids containing 2 to 18 carbon atoms.It is also described a process for the preparation of said products, which comprises reacting a corresponding starting compound, N or S-hydroxyalkyl substituted, with the chloride or the anhydride of the acid concerned.

Abstract: This invention relates to new retro-inverso peptides and peptide derivatives in the form of analogues of the bradykinin potentiating peptide (BPP.sub.

Abstract: A description is given of the use of agricultural waste in the form of chemically treated cereal straw or fruit plant prunings together with the liquid residue from sugarbeet molasses in the production of balanced feedingstuffs suitable for feeding polygastric animals. The final useful mixture contains the agricultural waste as its main component and up to 60% of sugarbeet pulp, the remainder consisting of conventional additives.

Abstract: The invention relates to a process for the production of the alpha-galactosidase enzyme by culturing yeasts of the Saccharomyces cerevisiae genus in a temperature range from 20.degree. C. to 40.degree. C.The invention also relates to a process for enzymic hydrolysis of raffinose by alpha-galactosidase from Saccharomyces cerevisiae. Such hydrolysis may take place with the yeast cells being present or also in the presence of enzymic extracts, both as such and enriched. An important advantage of the invention is the high alpha-galactosidasic activity of the selected microorganisms, together with the absence of any invertasic activity.

Abstract: A prosthetic polymer material is made non-thrombogenic by immobilizing apyrase on its surface. Immobilization is preferably carried out by hydrolytically activating the surface of a polyamide polymer or a polyethylene terphthalate polymer, and treating the hydrolyzed polymer with a solution of cross-linking agent and a solution of apyrase. The apyrase converts adenosine diphosphate to adenosine monophosphate and adenosine whereby the formation of thrombi is inhibited.

Abstract: It has been found that highly active uricase can be produced by fermentation from the microorganism Micrococcus roseus NRRL B 12196. The optimum activity of this microorganism is close to the pH values of the physiological liquors. The uricase so produced can be exploited in the clinical diagnostics for determining uric acid.

Abstract: The enzyme cholesterol esterase is produced by cultivating a strain of the Achromobacter delicatulus type, isolated from vegetable debris and identified by the symbol NRRL B-12115. Under the described culture conditions, the enzyme is exocellular and therefore does not require extraction from the cells.In addition, the micro-organism has a duplication time less than that of moulds and Actinomycetes. Cholesterol esters of fatty acids can be hydrolysed by adding them to the culture medium before inoculating the strain.

Abstract: For extracting undesirable components from vegetable tissues, more particularly from oil-bearing seeds having been stripped of the predominant fraction of their fatty components, a method is disclosed in which a number of serially arranged vessels equipped with stirring means is used in such a way that the materials to be treated are initially contacted by partially exhausted solvent and progressively with cleaner and cleaner solvent so that, when the solid materials are almost completely exhausted, they are washed with fresh solvent. The vessels are changed in rotational sequence, so that the system is continuous as regards the solvent and is discontinuous with respect to the solids.

Abstract: The invention relates to a composition suitable for testing biological tissues and/or liquids, the composition consisting of:(a) a dye chosen from the xanthene, azine, oxazine or acridine series, or from water-soluble dyes of the "diazo" series, or triphenylmethane,(b) a medium compatible with the biological tissue and/or liquid,(c) a substance capable of rapidly de-energizing the dye molecules when it encounters them (i.e. a quencher).The test method using said composition is also described.

Abstract: The invention relates to a process for the production of the alpha-galactoxidase enzyme by culturing yeasts of the Saccharomyces cerevisiae genus in a temperature range from 20.degree. C. to 40.degree. C.The invention also relates to a process for enzymic hydrolysis of raffinose by alpha-galactoxidase from Saccharomyces cerevisiae. Such hydrolysis may take place with the yeast cells being present or also in the presence of enzymic extracts, both as such and enriched. An important advantage of the invention is the high alpha-galactoxidasic activity of the selected microorganisms, together with the absence of any invertasic activity.

Abstract: The invention provides photovoltaic cells of new design in which the two semiconductors have lattice parameters which differ by more than 5%. The n-type semiconductor material is constituted by high conductivity CdS doped with indium in a percentage higher than 1%, and the p-type semiconductor material is constituted by Si. The active surface of said cells is equal to or greater than 1.5 cm.sup.2.

Abstract: The invention relates to a composition suitable for testing biological tissues and/or liquids, the composition consisting of:(a) a dye chosen from the xanthene, azine, oxazine or acridine series, or from water-soluble dyes of the "diazo" series, or triphenylmethane,(b) a medium compatible with the biological tissue and/or liquid,(c) a substance capable of rapidly de-energising the dye molecules when it encounters them (i.e. a quencher).The test method using said composition is also described.

Abstract: For removing potassium salts from distiller's wash, an acid the potassium salts of which are poorly soluble and an organic solvent are added to the wash, whereafter the precipitated salts are collected on a filter and the solvent is recovered by distillation.