Abstract: The present invention relates to a piston (10, 110, 210) for an internal combustion engine, comprising a piston crown (13), a circumferential ring part (16), a circumferential cooling channel (27) arranged in the vicinity of the ring part (16), boss supports (21) connected below the piston crown (13), piston bosses (18) connected thereto, and a piston skirt (17). According to the invention, a cavity (28) closed on all sides and having a closure element (29, 129, 229) arranged in the direction of the piston skirt (17) is provided below the piston crown (13).

Abstract: The present invention relates to a piston (10, 110, 210) for an internal combustion engine, comprising a piston crown (13), a circumferential ring part (16), a circumferential cooling channel (27) arranged in the vicinity of the ring part (16), boss supports (21) connected below the piston crown (13), piston bosses (18) connected thereto, and a piston skirt (17). According to the invention, a cavity (28) closed on all sides and having a closure element (29, 129, 229) arranged in the direction of the piston skirt (17) is provided below the piston crown (13).

Abstract: A flowmeter, in particular a magnetoinductive flowmeter, for measuring the flow rate of a moving medium has a measuring tube through which the medium is channeled and a flow-measuring device is positioned within the measuring tube. A valve housing is provided that is produced jointly with the measuring tube as a one-piece unit, the result being a compact flowmeter that easily meets hygienic standards.

Abstract: A flowmeter, in particular a magnetoinductive flowmeter, for measuring the flow rate of a moving medium has a measuring tube through which the medium is channeled and a flow-measuring device is positioned within the measuring tube. A valve housing is provided that is produced jointly with the measuring tube as a one-piece unit, the result being a compact flowmeter that easily meets hygienic standards.

Abstract: The invention relates to a cooled piston for internal combustion engines. The inventive piston is provided with an annular cooling channel on the periphery of the piston head. Said cooling channel, at its end that is open towards the piston shaft, is closed by a correspondingly shaped wall part that is radially split at least once. The aim of the invention is to improve the supply of cooling oil in the cooling channel. To this end, the wall part at the end allocated to the split is provided with a respective recess and with an upturned S-bend section that serves to deflect the cooling oil jet.

Abstract: Process for the diastereoselective reductive pinacol coupling of homochiral .alpha.-aminoaldehydesA process for the preparation of optically pure symmetrical compounds of the formula I ##STR1## is described, in which R.sup.1, R.sup.2 and R.sup.3, are explained in the description, with simultaneous control of the four centers of chirality indicated by *.

Abstract: Process for the diastereoselective reductive pinacol coupling of homochiral .alpha.-aminoaldehydesA process for the preparation of optically pure symmetrical compounds of the formula I ##STR1## is described in which R.sup.1, R.sup.2 and R.sup.3 are explained in the description, with simultaneous control of the four centers of chirality marked by *.

Abstract: Fluorinated arachidonic derivatives are 5-lipoxygenase inhibitors which have the useful pharmacologic activity as antiallergy and anti-inflammatory agents and are useful for treating, for example, asthma, anaphylaxis, allergy, rheumatoid arthritis, and psoriasis and cardiovascular diseases.