Abstract: Compounds of formula (II): ##STR1## wherein R is C.sub.1-20 alkyl; C.sub.3-8 cycloalkyl; C.sub.3-20 alkenyl; aralkyl; cycloalkylalkyl; heterocyclyl or heterocyclylalkyl; each being substituted with formyl; ##STR2## have activity against human and veterinary bacteria and mycoplasma. They may be produced by conventional methods and are used in conventional formulations.

Abstract: Compounds of formula (II): ##STR1## in which Y represents ##STR2## and R.sub.0 represents a C.sub.2-20 alkyl, C.sub.3-8 cycloalkyl, C.sub.4-20 alkenyl, arakyl, cycloalkylalkyl, heterocyclyl or heterocyclylalkyl group, which is substituted by a hydroxyiminohydrazono- or semicarbazono group, have activity against human and veterinary bacteria and mycoplasma. They may be produced by conventional methods and are used in conventional formulations.

Abstract: Compounds of formula (II): ##STR1## Z represents a divalent radical derived from a C.sub.1-20 alkane, C.sub.3-8 cycloalkane, C.sub.2-20 alkene, arene, aralkane, cycloalkylalkane, heterocycle, or heterocylylalkane; and R.sup.x and R.sup.y are the same or different and each represent (a) hydrogen, or (b) C.sub.1-20 alkyl, C.sub.2-8 alkenyl, either of which may be optionally substituted with C.sub.3-7 cycloalkyl, halogen, carboxy, C.sub.1-6 alkoxycarbonyl, carbamyl, aryl, heterocyclyl, hydroxy, C.sub.1-6 alkanoyloxy, amino, mono- or di-(C.sub.1-6) alkylamino; or (c) C.sub.3-7 cycloalkyl optionally substituted with C.sub.1-6 alkyl; or (d) aryl; or (e) heterocyclyl; or (f) R.sup.x and R.sup.y together with the nitrogen atom to which they are attached represent a C.sub.5-7 heterocyclic ring, are useful as antibacterial and antimycoplasma agents.

Abstract: This invention relates to antibacterial compounds and in particular to a class of esters which have antibacterial activity against certain Gram-positive and Gram-negative organisms, and also possess antimycoplasmal activity. The compounds are therefore of value in the treatment of human and veterinary infections.

Abstract: This invention relates to antibacterial compounds and in particular to a class of esters which have antibacterial activity against certain Gram-positive and Gram-negative organisms, and also possess anti-mycoplasmal activity. The compounds are therefore of value in the treatment of human and veterinary infections.

Abstract: A compound of formula (II), named pseudomonic acid C or a salt or ester thereof: ##STR1## has antibacterial and anti-mycoplasma activity, and can be produced either by fermentation of Pseudomonas fluorescens, or by de-oxygenation of pseudomonic acid A, the compound having an epoxide in place of the double bond. The compounds are therefore useful in the treatment of human and veterinary bacterial and mycoplasma-induced infections.

Abstract: A process for the purification of pseudomonic acid, particularly suitable for isolating the compound when prepared by bacterial culture, comprises making a solution in an organic solvent of the acidic components of the crude preparation substantially free of the neutral components. The polarity of the organic solvent is adjusted so that the pseudomonic acid crystallizes. This may be achieved either by adding a non-polar diluent such as n-heptane to the solution for example in methyl iso-butyl ketone; or by employing a di-C.sub.1-6 alkyl ether in which the acidic components dissolve and then crystallize out.

Abstract: A compound of formula (II), named pseudomonic acid C or a salt or ester thereof: ##STR1## has antibacterial and anti-mycoplasma activity, and can be produced either by fermentation of Pseudomonas fluorescens, or by de-oxygenation of pseudomonic acid A, the compound having a epoxide in place of the double bond. The compounds are therefore useful in the treatment of human and veterinary bacterial and mycoplasma-induced infections.

Abstract: A mirror or other target-sight element in a military vehicle is subject to oticeable vibration or dislocation relative to inertial space as the vehicle moves over rough terrain. To prevent such vibration or dislocation the mirror is driven by a torque motor that is controlled by a gyroscope that mechanically senses these mirror dislocations. The demodulated gyroscope output signal is amplified and applied to the torque motor, which thereby makes the correct repositionment of the mirror to keep the reflected image in a generally stable position in spite of terrain disturbances. The present invention contemplates a second gyroscope also responsive to vehicle pitch movements. The demodulated output signal of this second gyroscope is applied to a zero cross over detector, which produces a square wave output signal substantially in phase with the signal from the first gyroscope.