Abstract: Certain alkenyl diamines, the use of same for disinfecting and cleaning contact lenses and preserving ophthalmic products, and associated ophthalmic compositions are described.

Abstract: A contact lens cleaning solution containing an enzyme having proteolytic activity and a surfactant, and optionally also a chelating agent and urea, and a method of cleaning contact lenses utilizing this solution are described. The solution and method effectively remove deposits of proteinaceous material, mucins, lipids and calcium located either on or beneath the surface of the lens.

Abstract: Highly-coercive isometric iron oxide useful in magnetic toners for electrostatic photo-copying processes or for magnetic printers is produced by(a) subjecting Fe.sub.3 O.sub.4 pigment produced in a wet process to oxidation and(b) subsequently reducing the oxidized pigment from (a) to produce highly-coercive Fe.sub.3 O.sub.4 pigment.

Abstract: From organs of embryonic mammalia a new extract of active ingredients is recovered which extract can be used for controlling a reduced blood flow through periperhic organs and through the brain and which extract can be also used for controlling acne vulgaris. The corresponding extracts are used as active ingredients of corresponding pharmaceutical preparations.The new pharmaceutically active extract is prepared according to a process in which polar substances having a molecular weight below 5000 are isolated from the embryonic mammalian organs avoiding any degradation of substances having a higher molecular weight. The finely divided embryonic mammalian organs are extracted with a mixture of water and a water soluble organic solvent which contains nor more than 30 vol.-% of water at an about neutral pH value for stirring and refluxing.

Abstract: Novel surfactant compounds are provided of the formula R--CO--NH--(C.sub.2 H.sub.4 O).sub.n --CH.sub.2 COOH, wherein R--CO-- is the residue of at least one aliphatic carboxylic acid of 6-22 carbon atoms and n represents a number having an average of 2-10, as well as their salts with alkali metals, ammonium and amines. These compounds possess not only a low primary toxicity, but also a low secondary toxicity for the skin, and accordingly they are especially useful in cosmetic compositions, compositions for non-automatic dishwashing and laundering compositions for the fine laundry.

Abstract: Nontoxic, aqueous, contact lens cleaning compositions containing a weakly anionic surfactant, and optionally also a chelating agent, urea and/or a source of hydrated protons, and methods of chemically removing protein, lipid and calcium deposits from contact lens utilizing these compositions are described.

Abstract: A method of operating a high-pressure metal vapor discharge lamp at a periodic operating voltage of more than 500 Hz wherein the operating voltage is suddenly varied in phase at intervals, and preferably also wobbled in frequency, in order to avoid acoustic resonances in the lamp.

Abstract: A sustained release drug delivery system suitable for ophthalmic use is described. The delivery system utilizes a cationic polymer (polyquat) to deliver a drug residue. The drug residue delivered may comprise an anionic drug or a drug-carrier complex.

Abstract: A contact lens cleaning solution containing an enzyme having proteolytic activity and a surfactant, and optionally also a chelating agent and urea, and a method of cleaning contact lenses utilizing this solution are described. The solution and method effectively remove deposits of proteinaceous material, mucins, lipids and calcium located either on or beneath the surface of the lens.

Abstract: A nontoxic, aqueous, contact lens cleaning solution containing a mixture which includes a nonionic or weakly anionic surfactant, a chelating agent, a source of hydrated protons, and optionally also urea; and a method of chemically removing protein, lipid and calcium deposits from contact lens utilizing this solution are described.

Abstract: The invention relates to a composite magnetic disk for magnetic recording, which consists of an annular core of polymeric material to which is bonded at least one disk of reaction-bonded silicon carbide with a magnetic recording layer on its outer surface. After its processing, the SiSiC disk surface shows optimum planarity and smoothness so that it can be used as a magnetic disk substrate. Furthermore, the material has a low density and an extremely high specific modulus of elasticity so that numbers of revolution higher than obtainable with formerly known AlMg5 disk substrates can be reached.

Abstract: The improved polymeric hydrogel suitable for use in forming soft contact lenses is described. The hydrogel is improved by means of its resistance to the formation of calcium, lipid and protein deposits thereon. This resistance is achieved by means of covalent modification of the hydrogel with a surfactant.

Abstract: A needle printing device having a plurality of printing needles mounted in electromagnets with a permanent magnet operating through a yoke to retain a spring upon which the needles are mounted against the core of the electromagnet, the spring having an armature thereon which is released when the electromagnet is energized to permit the needles to be driven into printing position by operation of the spring. The particular features of the invention involve a construction wherein the yoke means is formed in two parts, with the first part having a surface which is formed in a common plane with a surface of the core of the electromagnet, the second part of the yoke having a surface which lies in a common plane with a surface of the armature when the electromagnetic is de-energized with the armature held against the core of the electromagnet.

Abstract: Compositions which stimulate tissue regeneration and whose active components are substances present in mammalian tissues and fluids are described. The active substances are a polypeptide consisting of 52 amino acids and having a molecular weight of about 5800, a glycosteroid and a glycosphingolipid. Compositions which contain the active ingredients accelerate wound healing when applied in the nano- to microgram ranges. Means for recovering the substances from mammalian materials in concentrated form by biochemical parting methods are also described.

Abstract: Amphoteric dissociating complexes which have a cationic group having the structure ##STR1## wherein: R.sub.1 is an aliphatic alkyl group having 6 to 22 carbons,R.sub.2 is a member of the group consisting of --R.sub.4 --(CH.sub.2 CH.sub.2)--COOH, --R.sub.4 --(CH.dbd.CH)COOH and --OPO.sub.3 H.sub.2, wherein R.sub.4 is --NH--, --NH--CO--, or --O--CO--, andR.sub.3 is hydrogen, --CH.sub.2 --COOH or --CH.sub.2 --CH.sub.2 --COOH; and an anionic group which is either a carboxylate having the formula.sup.- OOC--CH.sub.2 --(O--CH.sub.2 --CH.sub.2).sub.x --OC.sub.n H.sub.2n+1or a phosphate having the formula.sup.= O.sub.3 PO--CH.sub.2 --CH.sub.2 --(OCH.sub.2 --CH.sub.2).sub.x --OC.sub.n H.sub.2n+1wherein:n is 8 to 22 and x is 1 to 10; and z is 1 when the anionic radical is a carboxylate and z is 2 when the anionic radical is a phosphate are disclosed.The compositions are effective carriers for active pharmaceutical or cosmetic ingredients.

Abstract: A method of improving the reproducibility of the welds in an electric spot welding machine comprises prior to the initiation of a welding operation passing a preheating current of lower magnitude than the welding current through the parts to be welded. When either the total electrical workpiece resistance of the parts to be welded has fallen below a given limit or when its rate of decrease is slower than a predetermined limit the changeover from preheating current to welding current is effected.

Abstract: An apparatus and method for selectively electrochemically etching a surface is described. The use of the apparatus and the related method allows the establishment of etched planar surface which may be inclined with respect to the original surface.The apparatus has a cathode and multiple connectors which attach to the workpiece whose surface is to be etched. When the apparatus is operated the potential of the connectors are set so that the cathode is at least as negative as the lowest potential of the connectors.

Abstract: In an apparatus for electroslag welding of steel sheets with the aid of at least one wire electrode pair, a welding gap defined between the electrodes of the electrode pair, current-carrying conduits for the electrode pair, and a supply tube for supplying metal in a powdered state, and welding flux into the welding gap, the improvement includes a shielding device creating a duct along the current-carrying conduits. The duct, owing to the shielding device, is substantially free of any magnetic field, and the supply tube is positioned in the duct.

Abstract: A method of and apparatus for welding sheet steel panels by submerged arc welding is described. By providing one or, depending on the thickness of the sheet steel panels, more than one pair of closely spaced wire electrodes in the weld gap with the simultaneous introduction of additional filler metal carrying no current, preferably in the form of a metal powder, disadvantages associated with known methods may be avoided.

Abstract: In the process for the production of chlorine and alkali metal hydroxide by electrolysis according to the amalgam process using calcium- and/or sulphate containing crude salt, the calcium and/or sulphate contents introduced into the brine circuit by the crude salt are removed from the brine by precipitation of the double salt Na.sub.2 SO.sub.4 . CaSO.sub.4. Small particles of glauberite may be introduced to the brine to initiate and accellerate precipitation.