Abstract: The invention relates to a method for determining foaming behavior of a liquid by use of a gas, which includes supplying the gas to an amount of the substantially gas-free liquid to form a foam and analyzing one or more properties of the foam, wherein the gas is supplied through a grid provided with holes having a diameter of 25 to 100 .mu.m, which holes are located at a mutual distance of 5 to 15 times the diameter of the holes.

Abstract: A single-ended/push-pull converter with an input emitter-follower transistor having a d.c. blocking emitter impedance and a collector impedance. The signal voltage across the collector impedance produces a signal current of opposite phase in a second emitter follower transistor having an input impedance which equals the collector impedance of the first transistor. The input circuit of a current mirror is included in the emitter circuit of the second emitter follower transistor and the output circuit is connected in parallel with the d.c. blocking impedance to keep the collector currents in the two emitter followers equal and constant.

Abstract: Aqueous oil emulsions which can be whipped to an overrun of 70 to 500% and heat treated for microbial stability are prepared containing an aqueous phase with a pH of 4.2 to 5.5, a fat content of 3 to 50%, an emulsifier that forms a flocculate in water at the pH of the aqueous phase, such as partial fatty acid esters of polyalcohols, and a globular protein in substantial absence of coagulated protein. The globular protein may be a complex of globular protein with an anionic polysaccharide and the fat may be butter fat or vegetable fat.