Abstract: This invention relates to mixed silane reagents containing a complexon group in the reagent molecule, a method of making said reagents, and porous or nonporous inorganic materials having surface-bound complexon groups which are advantageously modified with the new reagents.The new mixed silane reagents are of the formula ##STR1## where R is methyl or ethyl and N is 0 or 1. The new reagents are produced by treatment of compounds of the formula(RO).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 NHR.sup.2where R is methyl or ethyl with a dianhydride of the formula ##STR2## where n is 0 or 1. The new silane reagents II and III are used for the modification of inorganic materials, such as silicon dioxide, aluminum oxide, titanium dioxide, and glass, to obtain modified materials containing the complexon groups of the formulas ##STR3## where n is 0 or 1, and where the groups of Formulas V and VI are bound to the surface of the inorganic materials via the silicon atoms, shown above as incomplete valences.

Abstract: The invention relates to a synthetic intraocular lens swellable in physiologic saline which is made from a polymer or a copolymer, at least one component of which is hydrophylic and the other one may be hydrophobic, crosslinked or non-crosslinked, whereas the content of swelling agent in it is below the equilibrium state whereby its glass-transition temperature T.sub.g is between -5.degree. C. and 45.degree. C. The lens is deformed above T.sub.g into a form suitable for surgical insertion, cooled below T.sub.g, and stored and surgically applied at the temperature below T.sub.g, and then relaxed in eye by post-swelling and heating. The lens may be incompletely swollen, instead in physiologic saline or water, in another physiologically harmless liquid, advantageously in glycerol.

Abstract: The present invention pertains to a preparation for diagnosing the transport function of the fallopian tube and to a method for making such a preparation.The diagnostic preparation for investigation of the transport function of female fallopian tube, comprises a suspension of a biocompatible, biodegradable, and, if desired, labelled particles, in a vehicle commonly used for parenteral applications wherein the particles have a spherical shape with diameters in the region 10 to 600 um, which are formed from a soft hydrophilic gel based on a polymer selected from the group comprising additionally crosslinked water-soluble nontoxic and biodegradable inert polysaccharides and physiologically inert water-soluble and biodegradable poly(amino acids), polypeptides, and their derivatives, which may contain physiologically active substances.

Abstract: A method and apparatus for the polymerization cast molding of lenses from hydrophilic gels. A hydrophobic liquid which is essentially immiscible with a hydrophilic polymerization mixture is introduced into a mold having a hydrophobic surface, followed by dosing of the hydrophilic monomer mixture which is allowed to polymerize to form a drop which is pressed, while polymerizing, into the mold with a punch having a hydrophobic molding surface. The polymerizing monomer mixture is maintained under the pressure of the punch until the end of the polymerization. Any overflow of the two liquids is allowed to escape between the mold and the punch. The apparatus comprises a concave mold with an inner hydrophobic, rotation-symmetrical surface, and a punch with a hydrophobic molding surface which when placed in relationship to the mold has an overflow space formed between the mold and the punch.

Abstract: This invention relates to a process for preparing cinnamic acid by hydrolysis of 1,1,1,3-tetrachloro-3-phenylpropane with acetic acid, trifluoroacetic acid or formic acid, optionally in the presence sulphuric acid, phosphoric acid, para-toluenesulphonic acid, or a cation exchange resin containing sulphonic acid groups. The mixture is heated at a temperature from about 80.degree. to about 150.degree. C. until hydrogen chloride evolution ceases, after which time the cinnamic acid is separated.

Abstract: The invention pertains to a method for the production of bead dextran materials for gel chromatography.The subject of the invention is a method for the production of bead dextran materials for gel chromatography, wherein dextran is, before or during the suspension process or in both stages, subjected to reduction in an alkaline solution, advantageously by the action of sodium borohydride, whereas the density of crosslinking is controlled above all by variation of the concentration of the initial dextran solution and the resulting gel may be optionally subjected to the additional crosslinking in a separate subsequent operation.The procedure according to the invention provides the product of higher quality with a lower content of carboxylic groups and substantially facilitates the preparation of gels with a very high and a very low crosslink density.

Abstract: Hydrophilic three dimensional polymers, the prevailing mass of which is formed by structural units corresponding to monomers miscible with water at any ratio, and the method for their production, wherein one weight part of the monomers miscible with water is copolymerized, by the effect of free-radical initiators, with 0.01 to 1 weight part of a polyfunctional unsaturated oligomer, which is prepared with an average degree of polymerization x=3 to x=100 by the anionic polymerization of allyl methacrylate, with the contingent addition of methacrylonitrile or methacrylic esters of univalent saturated alcohols containing 1 to 4 carbon atoms or methacrylic esters of monohydroxy compounds containing at least one etheric oxygen atom in the chain, or where 0.7 to 1 weight part of monomers miscible with water is copolymerized with 0.01 to 0.

Abstract: A protective layer for carbonaceous materials, especially graphite electrodes, applied by plasma-coating method comprised of 65-98 .sup.w /o of metal aluminum, 1-20 .sup.w /o of combined metal silicon with silica (SiO.sub.l) and up to 15 .sup.w /o of oxygenous compounds of aluminum. The resistivity of the layer is 0.07.10.sup.-6 ohm.m up to 0.3.10.sup.-6 ohm.m at 20.degree. C. and 0.12.10.sup.-6 ohm.m up to 0.7.10.sup.-6 ohm.m at 400.degree. C.The method of producing the protective layer comprises the following steps of directing a plasma flame of a water stabilized plasma burner toward the carbonaceous material, and feeding into a plasma flame a particulate composition comprising between about 85 .sup.w /o to about 99 .sup.w /o of metallic aluminum having a particle size of between about 0.09 to about 0.180 mm and between about 1 to about 15 .sup.w /o of silicon having a particle size of between about 0.07 to about 0.165 mm.

Abstract: The invention pertains to a method for postpolymerization of granules of polyamide based on .epsilon.-caprolactam and formed by the anionic polymerization in melt and solves the problem of decreasing the content of low-molecular-weight substances in granules. At the same time, the invention pertains to an arrangement of equipment for performing the postpolymerization. The objective of the invention is a method for the continuous postpolymerization of polyamide based on .epsilon.-caprolactam and formed by the anionic polymerization in melt, wherein the postpolymerization proceeds in two stages, while the granules are heated in the first stage to the required temperature of postpolymerization 160.degree. to 200.degree. C. for 5 to 30 minutes during their vertical transport and allowed at this temperature for 2 to 6 hours in the second stage without mechanical intervention at their gravitation transport which is assisted by vibrations or a reservoir.

Abstract: A column for preparative liquid chomatography is provided with an inlet tube (5) for injected sample, which is closed on the end with a gauze or fritted plate (6), passes through the center of a lower terminal (3), and ends in the distance equal to 70 to 90% of the total length of the column from the lower end of this tube, whereas the lower terminal (3) has at least four openings (7) or a circular slot or two half-slots which are placed outside the center of terminal on a concentric circle with diameter ranging between 40 to 70% of the inner diameter of column tube (1). The column operates in such a way, that mobile phase is introduced into the column through the center of the upper terminal (2) and a sample is injected into a sorbent through the inlet tube (5) for sample after stopping the flow of mobile phase and then the flow of mobile phase is restored.

Abstract: The invention pertains to copolymers activated for bonding of biologically active compounds and to a method for preparation thereof.Soluble and biodegradable copolymers activated for bonding of biologically active compounds which have their main chain formed from units of aspartic acid or glutamic acid, or both, or also from units of other amino acids, according to the general formula I ##STR1## where n is 1 or 2, m is 1 or 2, a+b+c is 100, a is 0.5 to 100, b is 0 to 99.5, c is 0 to 80; the substituent R.sup.1 is --NH--NH.sub.2, --N.tbd.N or ##STR2## where x is 2 to 6, R.sup.2 is --NH(CH.sub.2).sub.x OH where x=2 to 6; and R.sup.3 is methyl, 2-propyl, 2-methylpropyl, butyl, 2-butyl, benzyl or 4-hydroxybenzyl, and the molecular weight is 5,000 to 1,000,000.

Abstract: According to the method of the invention, molds charged with a monomer mixture are arranged into columns with precisely coaxial casting surfaces inside these columns, namely, in tubes of cylindric shape with openings only 0.01 to 0.03 mm larger the diameter of the outer cylindric surface of the mold or the diameter of a hypothetical cylindrical surface circumscribed to any other, preferably a parallel outer surface of the casting mold. The tube with the inserted column of molds is provided with airtight seals at both ends whereas at least one seal is provided with a valve for alternating evacuation and refilling with an inert gas. The invention also provides apparatus by which a complete sequence of required operations including column tilting and rotation is carried out with the tubes charged in this way until the polymerization is completed without transferring the molds from sealed tubes from one apparatus to another or into intermediate magazines.

Abstract: The (S) and (RS) forms of certain phosphonylmethoxyalkyl adenines and their salts have an antiviral effect against several DNA viruses and can be used for the treatment of virus diseases in human and veterinary medicine.

Abstract: A method and apparatus are provided for spreading monomer mixture in molds for the centrifugal casting of contact lenses, wherein the said molds containing a monomer mixture are rotated around their axis with the frequency 0.5 to 5 revolutions per minute and, at the same time, the axis of molds is periodically tilted between extreme positions, the angle to the vertical direction of which is in the first extreme position 30.degree. to 60.degree. and in the second extreme position 70.degree. to 100.degree. and the frequency of tilting is twice to ten times lower than the frequency of rotation.

Abstract: The present invention relates to the foundry industry and solves the problem of extended service life of valve closure gate assemblies for foundry ladles. The valve closure gate assembly of the present invention comprises two mutually slidable heat-resistant gates furnished with a protecting layer of an oxide refractory material and having flow-through rings made from an oxide refractory material disposed in the openings of the gates. The respective upper and lower surfaces of the rings are coated with a layer of refractory material.

Abstract: The invention pertains to a method for processing of organic materials containing nitrogen compounds, where the organic material undergoes an anaerobic digestion with simultaneous liberation of biogas which contains methane and carbon dioxide. The liquid product obtained after anaerobic digestion is, according to the invention, heated to boiling temperature, ammonia bonded as carbonate which is distilled off, and the tail product from distillation is further processed to the valuable product and clear water or is discharged as prepurified waste water. During the processing to the valuable product in the form of organo-phophate-lime concentrate, the tail product of distillation is alkalized by lime and carbonized with carbon dioxide. Biogas or carbon dioxide obtained by distillation may be used in carbonation.

Abstract: A protective layer for carbonaceous materials, especially graphite electrodes, applied by plasma-coating method comprised of 65-98 w/o of metal aluminum, 1-20 w/o of combined metal silicon with silica (SiO.sub.2) and up to 15 w/o of oxygenous compounds of aluminum. The resistivity of the layer is 0.07.10.sup.-6 ohm.m up to 0.3.10.sup.-6 ohm.m at 20.degree. C. and 0.12.10.sup.-6 ohm.m up to 0.7.10.sup.-6 ohm.m at 400.degree. C.The method of producing the protective layer comprises the following steps of directing a plasma flame of a water stabilized plasma burner toward the carbonaceous material, and feeding into a plasma flame a particulate composition comprising between about 85 w/o to about 99 w/o of metallic aluminum having a particle size of between about 0.09 to about 0.180 mm and between about 1 to about 15 w/o of silicon having a particle size of between about 0.07 to about 0.165 mm.

Abstract: The invention solves a method and an apparatus for the separation of solids from gaseous mixtures especially the separation of phthalic anhydride after its desublimation from mixtures with vapours of sublimable substances, steam, air or inert gases, which originate at sublimation refining or at catalytic production of phthalic anhydride by air oxidation of naphthalene or o-xylene.The flakes of phthalic anhydride, which originated after the decrease of temperature in the desublimator space were agglomerated and compacted due to the increase of velocity of gaseous mixture in contracted cross-section of the separator. The formed agglomerates are separated from the gaseous mixture and collected in a receiver well. From the well the agglomerates are transported by a conveyor or they are continuously melted. The melt formed outlets through a siphon. The rest 1 to 5% of phthalic anhydride is separated from gaseous mixture in a filter from wire net and by gradual melting is introduced into the receiver well.

Abstract: The invented column for liquid chromatography consists of a glass tube, which is inserted into a metallic tube. The metallic tube is provided with recesses in its inner wall at both ends, which accommodate conic tightening rings from metal together with conic circumferential packings from plastics, advantageously from poly(tetrafluoroethylene). The column further consists of front packings from plastics, advantageously from poly(tetrafluoroethylene, which have porous disks or filter gauzes pressed into their recesses. Both types of packing are tightened with metallic terminal elements screwed on the metallic tube, which are provided with expansion slots at sides adjacent to the front packings. The metallic tube may have openings for a visual inspection of column packing.

Abstract: The invention relates to a method and to a reactor for the single-step polymerization of vinyl monomers by a heterogeneous polymerization in bulk by means of organometalic catalysts. A method according to the invention consists in charging a vertical reactor, which is provided with at least two planetary stirrers situated outside the reactor axis, each stirrer formed from a planar centrally-symmetrical two-blade paddle, with a vinyl monomer, the subsequent introduction of an organometalic catalyst in a solution under stirring and in partial doses amounting to 10.sup.-5 to 10.sup.-3 mole up to the final amount of 5.times.10.sup.-4 to 5.times.10.sup.-2 mole of catalyst per mole of monomer, stirring of the batch, cutting and disintegration of the formed compact mass with the planetary stirrers and its parallel wiping from the surface of reactor with wiping blades until the batch acquires a powdery form and the resulting product is discharged.