Abstract: A keeping facility for keeping poultry animals includes a floor defining a first dwelling surface for laying hens and an inlay defining a second dwelling surface for rearing chicks, wherein the inlay is detachably arranged above the floor. The floor defining the first dwelling surface and/or the inlay defining the second dwelling surface are formed as a mesh floor.

Abstract: A piglet-protection device for a farrowing pen is equipped with a first side part, with a trough console, which is connected to the first side part, and with a second side part, which is connected to the trough console so as to be pivotable about a pivot axis. By pivoting the second side part, the piglet-protection device can be brought into a piglet-protection position, in which the second side part is arranged substantially parallel to the first side part, and into a movement position, in which the second side part is spread away from the first side part. A first door element and a second door element delimit the piglet-protection device at the rear in the piglet-protection position. The first door element and/or the second door element are arranged in a length-adjustable manner on the first and second side part, respectively.

Abstract: A piglet-protection device for a farrowing pen is equipped with a first side part, with a trough console, which is connected to the first side part, and with a second side part, which is connected to the trough console so as to be pivotable about a pivot axis. By pivoting the second side part, the piglet-protection device can be brought into a piglet-protection position, in which the second side part is arranged substantially parallel to the first side part, and into a movement position, in which the second side part is spread away from the first side part. A first door element and a second door element delimit the piglet-protection device at the rear in the piglet-protection position. The first door element and/or the second door element are arranged in a length-adjustable manner on the first and second side part, respectively.

Abstract: The present invention provides methods for the isolation of an amphipathic, hydrophobic or hydrophilic compound from a medium that is either hydrophilic or hydrophobic, respectively, said methods comprising allowing the formation and/or accumulation of foam comprising said compound at the medium-gas interface, applying said foam directly onto an adsorbent which effects collapse of said foam, and isolating said adsorbed compound by desorption.

Abstract: The invention is directed to a method of producing L-amino acids from .alpha.-ketocarboxylic acids by means of continuous fermentation with the aid of glutamate producing bacteria with biomass retention in which the cells are separated by microfiltration and/or centrifugal separators.

Abstract: Water soluble .alpha.-ketocarboxylic acids are continuously converted in a membrane reactor into the corresponding .alpha.-hydrocarboxylic acids. The conversion takes place in the presence of a substrate specific dehydrogenase and of a nicotinamide-adenine-dinucleotide (NAD.sup.+ /NADH) enlarged in molecular weight through linkage to a water soluble polymer as coenzyme. Simultaneously NADH is regenerated continuously from NAD.sup.+ in presence of a formate dehydrogenase and from formate ion. The membrane must have a mean pore diameter of 1 to 3 nm. As coenzyme there is employed 0.1 to 10 mmol/l of NAD.sup.+ /NADH present bound to a water soluble polymer having an average molecular weight between 500 and 50,000. There is continuously supplied to the reactor a substrate stream which contains 50 to 100% of the maximum amount soluble, but not over 2,000 mmol/l, of the reacting .alpha.-ketocarboxylic acid in the form of a water soluble salt and 100 to 6,000 mmol/l of a formate.

Abstract: Water soluble .alpha.-ketocarboxylic acids are continuously converted in a membrane reactor into the corresponding aminoacids. The conversion takes place in the presence of a substrate specific dehydrogenase, of ammonium ions and of a nicotinamide-adenine-dinucleotide (NAD.sup.+ /NADH) enlarged in molecular weight through linkage to a water soluble polymer as coenzyme. Simultaneously NADH is regenerated continuously from NAD.sup.+ in presence of a formate dehydrogenase and from formate ion. The membrane must have a mean pore diameter of 1 to 3 nm. As coenzyme there is employed 0.1 to 10 mmol/l of NAD.sup.+ /NADH present bound to a polyoxyethylene having an average molecular weight between 500 and 50,000. There is continuously supplied to the reactor a substrate stream which contains 50 to 100% of the maximum amount soluble, but not over 2,000 mmol/l, of the reacting .alpha.