A bag (2) for use in leak testing vacuum packages, by placing a vacuum package in a bag of elastic flexible foil, providing a pressure differential between the outside and the inside of the bag, and monitoring the pressure variation in the space between the outside of the package and the inside of the flexible bag. According to the invention, the bag (2) is double-walled with the inner and outer w...

The present invention relates to a live vaccine against infectious bronchitis virus (IBV) for day-old chickens based on IBV-strain 84-3 which is registered in the Institut Pasteur in Paris under No. I-473.

A method of treating an aqueous system is disclosed which comprises adding thereto a phosphonium compound of the formula: wherein each R, which may be the same or different, is a C1-C6 alkyl group which is optionally substituted by, say, a hydroxy, ethyl, aryl or cyano group, or a phenyl group which is optionally substituted by one or more C1-C4 alkyl groups, R1 is a C8-C18 alkyl group and ...

A method of treating an aqueous system is disclosed which comprises adding thereto a phosphonium compound of the formula: wherein each R, which may be the same or different, is a C1-C6 alkyl group which is optionally substituted by, say, a hydroxy, ethyl, aryl or cyano group, or a phenyl group which is optionally substituted by one or more C1-C4 alkyl groups, R1 is a C8-C18 alkyl group and ...

In a manual mode of a switch (40) engine speed control is determined by signal (SLP) from a speed lever (52), acting on the engine (10) by way of a governor (32) responsive also to an engine speed feedback signal from a sensor (48). The ratio of a multi-speed transmission is determined manually by means of a gear-shift lever (16). In an automatic mode a selector switch (42) determined whether the ...