Abstract: A biologically degradable film is prepared consisting of a synthetic polymer and a biologically degradable polymer. The biologically degradable polymer is divided into small particles in an aqueous suspension by means of enzymes that split and release small molecules from the surface of the biopolymer particles. After achieving desired particle size, an emulsion is formed with vegetable oil and the particles coated with enzyme protein become coated with vegetable oil, which at the same time interrupts the degradation of the biopolymer particles by the enzyme. The coated particles with the oil are separated from the suspension to remove small molecules after which the particles are re-dried and then pulverized. The final film is prepared in a film extruder in which the biopolymer is mixed with the synthetic polymer and possibly other additives that are generally used in forming polymer films.

Abstract: The present invention relates to a procedure for hydrolyzing keratin, in which procedure the solid keratin ingredient is (a) pretreated with an aqueous solution containing sulphite ions to form denatured keratin, and (b) hydrolyzed with the aid of a proteolytic enzyme to form keratin hydrolysate. The pretreatment is carried out at about 60.degree. to 100.degree. C. and it lasts about 10 minutes to 4 hours. The hydrolysate thus obtained can be treated further for use as a fodder addition or to isolate oligopeptides for use in cosmetics.

Abstract: The invention relates to a temperature-gradient incubator for studying temperature dependent phenomena, such as temperature ranges for the growth of microbes, comprising a temperature-gradient plate (10) serving as a reaction substrate and heat transfer elements (17 and 18) extending along the opposite edges of the temperature-gradient plate (10) for the heating and cooling of the edges of the temperature-gradient plate (10). Each heat transfer element (17 or 18) is provided with two passages for the circulation of a heating and/or cooling medium. Gable elements (9, 16) connect the passages to each other. The gable elements (9, 16) and pipe joint elements (6, 13) are separated from the ends of heat transfer elements (17, 18) by rubber sheets (1) which serve to provide heat insulation and sealing and are provided with holes (2, 3) for the circulation of a medium.

Abstract: A biologically degradable film is prepared consisting of a synthetic polymer and a biologically degradable polymer. The biologically degradable polymer is divided into small particles in an aqueous suspension by means of enzymes that split and release small molecules from the surface of the biopolymer particles. After achieving desired particle size, an emulsion is formed with vegetable oil and the particles coated with enzyme protein become coated with vegetable oil, which at the same time interrupts the degradation of the biopolymer particles by the enzyme. The coated particles with the oil are separated from the suspension to remove small molecules after which the particles are re-dried and then pulverized. The final film is prepared in a film extruder in which the biopolymer is mixed with the synthetic polymer and possibly other additives that are generally used informing polymer films.

Abstract: A biologically degradable film is prepared consisting of a synthetic polymer and a biologically degradable polymer. The biologically degradable polymer is divided into small particles by means of enzymes produced by microbes in the form of spores, which enzymes split and release small molecules from the surface of the biopolymer particles. After achieving desired particle size, an emulsion is formed with vegetable oil and particles coated with enzyme protein become coated with vegetable oil, which at the same time interrupts the degradation of the biopolymer particles by the enzyme. The coated particles with the oil is separated from the suspension to remove small molecules after which the particles are redried and then pulverized. The final film is prepared in a film extruder in which the biopolymer is mixed with the synthetic polymer and possibly with other additives that are generally used in forming polymer films.