Di"decyl" or "decyl"-n-decyl- alkyl quaternary ammonium compounds of formula [decyl-@(R)2-A]X<-> wherein A is "decyl" or n-decyl, R is C1-4alkyl and X is Cl<->, Br<->, I<->, (m)ethosulphate and "decyl" is a mixture of primary alkyl groups of 10c arrows having at least two branches, are useful as disinfectants.

Di"decyl" or "decyl"-n-decyl- alkyl quaternary ammonium compounds of formula [decyl-@(R)2-A]X<-> wherein A is "decyl" or n-decyl, R is C1-4alkyl and X is Cl<->, Br<->, I<->, (m)ethosulphate and "decyl" is a mixture of primary alkyl groups of 10c arrows having at least two branches, are useful as disinfectants.

Di"decyl" or "decyl"-n-decyl- alkyl quaternary ammonium compounds of formula [decyl-@(R)2-A]X<-> wherein A is "decyl" or n-decyl, R is C1-4alkyl and X is Cl<->, Br<->, I<->, (m)ethosulphate and "decyl" is a mixture of primary alkyl groups of 10c arrows having at least two branches, are useful as disinfectants.

Di"decyl" or "decyl"-n-decyl- alkyl quaternary ammonium compounds of formula [decyl-@(R)2-A]X<-> wherein A is "decyl" or n-decyl, R is C1-4alkyl and X is Cl<->, Br<->, I<->, (m)ethosulphate and "decyl" is a mixture of primary alkyl groups of 10c arrows having at least two branches, are useful as disinfectants.

The invention provides an apparatus for controlling both the supersaturation of the mother liquor and the crystal content of massecuite by measuring di-electric constant and electrical conductivity at radio frequencies by means of a probe which is included in a circuit which may be tuned to a fixed setting or may be variably tuned, the combined impedance is measured as a function of the tuning and...

1,4-Dihydropyridine-3-carboxylate derivatives are produced having vasodilating and hypotensive action.