Abstract: Method and composition for vaccination of a pig against swine dysentary caused by T. hyodysenteriae infection characterized by parenteral, preferably intramuscular, administration to the pigs of a live strain or of an oxygen-treated, non-viable strain of T.hyodysenteriae.

Abstract: A plotting implement for creating a record on a photosensitive surface. The plotting implement includes a contact tip for contacting and for moving between different positions on the surface, the contact tip in use constituting an electromagnetic radiation source located at the surface, whereby the radiation source at the tip exposes points and/or lines of contact of the tip with the surface. The contact tip has a radiation aperture of a predetermined diameter to expose lines of a width equal to that diameter. An optic fibre of the required diameter may extend from an electromagnetic radiation source and terminate at the aperture. Alternatively the electromagnetic radiation source may comprise a light emitting diode (LED) having a transparent body tapering from the source of light towards the tip, the tapering body being surrounded by opaque material and being truncated before reaching a point to provide a tip of the transparent body of the predetermined diameter.

Abstract: A movement parameter sensor for sensing of parameters of movement between a stator member defining a frame of reference and a rotor member movable relative to the stationary member about a rotation axis. The sensor includes field providing means for generating an electric field located at the stator member, the field providing means including a pole arrangement comprising an array of four source electrode means arranged adjacent to each other along a field line around the rotation axis. The field providing means includes an excitation signal generator for generating four equal frequency excitation signals at 90 degree increments of phase, each one of the four excitation signals being applied to a respective one of the four source electrode means such that a virtually moving electric field is created at the source electrode means so that the electric field effectively moves relative to the stator member along the field line.

Abstract: A process for the upgrading of a hydrocarbon feedstock which includesproviding a feedstock including C.sub.4 and higher hydrocarbons which include paraffins and cycloparaffinic hydrocarbons;contacting the feedstock with a conventional naphtha reforming catalyst at an elevated temperature and at a liquid hourly space velocity (LHSV) of greater than approximately 5, when the cycloparaffin content is approximately 10% by weight or greater;and contacting the feedstock with a metal-containing ZSM-5 type zeolite catalyst at an elevated temperature at approximately 0.5 to 2 LHSV when the initial cycloparaffin content is reduced to less than approximately 10% by weight, and solely with a metal-containing ZSM-5 type zeolite catalyst at an elevated temperature at approximately 0.2 to 2 LHSV when the initial cycloparaffin content is less than approximately 10% by weight.

Abstract: A method for facilitating the flow of material in fines. The fines are selected from silica based materials and coals; and the level of impurity in the fines and comprising metal oxide, carbonate and sulphides in the case of silica materials, and coal ash in the case of coals, is determined. A thick slurry of the fines in water is prepared, and a quantity of dispersant proportional to the determined level of impurity is added to the slurry to form a pumpable slurry.