Abstract: A process for preparing an amino deoxy derivative of a polysaccharide. The process comprises oxidizing the polysaccharide with dimethyl sulfoxide in combination with acetic anhydride or acetic anhydride with paraformaldehyde in a first step. The product from the first step is subjected to reductive amination.

Abstract: A method for storing logs. A containment curtain is deployed around a plurality of logs. Fresh water is admitted into the region defined by the curtain to form a two layered bay. The upper layer of water is fresh water and contains the logs to be stored. The lower layer of water is salt water.

Abstract: A process for leaching copper from copper sulphide containing ore, in particular copper from chalcopyrite containing ore, is provided. The ore is preferably initially ground up and mixed with an aqueous acid leaching medium containing sulphide oxidizing bacteria, and a bacterial nutrient, and a catalytic amount of silver. Provision is made in the bacterial nutrient for a source of carbon dioxide and oxygen for the bacteria, both of which may be supplied by means of sparging with carbon dioxide enriched air. A bacterial compatible acid is added initially to the ore and leaching medium mixture and periodically during the process so that sulphide in the copper sulphide is oxidized in stoichiometric amounts to elemental sulphur. During leaching the oxidation potential is maintained between about 0.54 to 0.66 volts, most readily by initial addition of thiosulphate and dissolved copper.

Abstract: A process for preparing n-amino-n-deoxy cellulose where n is 2 or 3 and has the same value at each occurrence in one molecule. When n is 2 cellulose is selectively oxidized by (a) reacting it with triphenylmethyl chloride; then (b) reacting the product from (a) with acetic anhydride and dimethylsulfoxide. The product from (b) is then subjected to reductive amination. When n is 3 cellulose is reacted with dimethylsulfoxide and paraformaldehyde. The product from (a) is then reacted with acetic anhydride and dimethylsulfoxide and the product from (b) then subjected to reductive amination.

Abstract: A method of conducting an electrolysis is described. The method comprises tumbling an anode made up of a plurality of electrically conducting particles in an electrolyte while feeding a positive D.C. current to the particles. The current is fed via an anode feeder that is connected to a positive D.C. supply. A cathode is maintained in electrical contact with the electrolyte and is spaced from the anode. A negative direct current is applied to the cathode.

Abstract: A method of completely coating a plurality of substrates with lead dioxide by electrolysis while the substrates are immersed in an electrolyte containing a lead salt. Each substrate has curved surfaces and is able to roll freely. The method comprises tumbling the substrates in a porous barrel rotating about a central anode feeder at a speed of three to eight revolutions per minute. Substrates contact the anode feeder throughout the electrolysis. The anode feeder is of a material that does not dissolve or passivate in the electrolyte under the reaction conditions during the electrolysis. The temperature during the electrolysis is maintained at less than 70.degree. C. A positive current is applied to the anode feeder to maintain an anode current density in the range 1 to 8 milliamps per square centimeter throughout the electrolysis. A negative current is applied to a cathode spaced from the anode.

Abstract: A fish rearing system. Water is recycled from a fish rearing tank to a primary filter. Ammoniacal nitrogen load is reduced by rapid removal of nitrogenous solids. The water is formed through a biological filter containing a particulate medium of small particle size. Prior removal of solids prevents filter blockage. The filter is provided with backwash means that include an air scour. The water is reaerated after the filter and returned to the fish rearing tank.

Abstract: A crane for ships and having a boom pivotally mounted for vertical movement on a base, telescopic hydraulic jack means connected to the boom to support the outer end thereof in a desired position, a pulley carried by the boom near the outer end thereof and means for shifting the pulley towards and away from the base, a cable threaded over the pulley and winch means for reeling in and paying out this cable, and a control system including accumulator means connected to the jack means for maintaining the boom outer end substantially in the position thereof regardless of ship motion under wave action when the cable is supporting a load in the water.

Abstract: A method of launching and recovering self-propelled submersibles by using a drogue below the surface of the water where comparatively stable conditions exist. A probe on the submersible is unlatched from or latched to the drogue during relative movement therebetween when it is desired to release or recover the submersible. The apparatus includes a suitable drogue, a probe connected to the submersible, and releasable latching device in the drogue and on the probe.