Abstract: The method of protecting a polymeric plastic from attack by bacteria and fungi includes providing bioactive glass particles having a mean particles size preferably less than 2 ?m as an additive incorporated into the polymeric plastic. The bioactive glass particles contain 40 to 60% by weight of SiO2, 10 to 30% by weight of CaO, 10 to 35% by weight of Na2O, 2 to 8 % by weight of P2O5, 0 to 25% by weight of CaF2, 0 to 10% by weight of B2O3, 0 to 8% by weight of K2O and/or 0 to 5% by weight of MgO. The additive is included in amounts of up to 25% by weight in the polymeric plastic.

Abstract: The present invention relates to a high-purity bioactive glass, having the following composition in % by weight: SiO2 ??35-86 Na2O ?5.5-35 CaO ??4-46 P2O5 ??1-15 Further additional 0.05-15 substances and to a process for producing it, in which the glass is produced in a radiofrequency-heated skull crucible.

Abstract: The invention relates to a container for receiving and transporting sensitive plate-like objects, in particular for transporting surface-modified glass substrates. The container comprises an upper part and a lower part. The lower part comprises two lateral sides, two longitudinal sides and a bottom which commonly circumscribe a hollow space for receiving plate-like objects. At each of the lateral sides a series of first ridges is arranged perpendicularly to the bottom, forming a plurality of guide grooves for the plate-like objects. The upper part comprises an inner surface which is parallel to the bottom when the container is closed. At the inner surface at least one second protruding ridge is arranged extending in parallel to both lateral sides along the total inner surface, thus limiting the mobility of the plate-like objects within the guide grooves.

Abstract: The invention relates to a bioactive glass as additive for polymers, wherein the bioactive glass contains 40 to 90 percent by weight SiO2; 4 to 45 percent by weight CaO; 0 to 35 percent by weight Na2O; 2 to 16 percent by weight P2O5; 0 to 25 percent by weight CaF2; 0 to 10 percent by weight B2O3; 0 to 8 percent by weight K2O and/or 0 to 5 percent by weight MgO. The invention also relates to a polymer comprising bioactive glass, wherein 1 to 30 percent by weight of bioactive particles are contained in relation to its overall weight The invention further relates to the utilization of bioactive glass in households, packaging, food processing, sealing materials, garments, medicine, sanitation, automotive industry, building industry, plastic coatings and adhesives.

Abstract: A receptacle for receiving plates having a sensitive surface is disclosed which is particularly suited for receiving glass plates having a sensitized surface. The receptacle comprises a container part (12) having four walls (16, 18) and a bottom (24), whereby a hollow space is circumscribed. The receptacle further comprises a removable top (14) for closing the container part (12). The container part (12) comprises guide grooves (28) located at two opposite walls (16, 18) for receiving plates (56). A flexible element (40) formed as a bent tongue is provided integrally with the bottom or cover for securing plates received within the receptacle (10) against movement in longitudinal direction.

Abstract: The present invention relates to a system for preparing an experimentally validated microarray, in particular experimentally validated DNA microarrays, to a corresponding preparation method and to the microarray obtainable by the method of the invention. The system of the invention and the method are particularly distinguished by a decoupling of provision of the layout for the validated microarray and preparation of the final product itself.

Abstract: In the method according to the invention cold or unheated hardened glass and/or glass-ceramic parts are bonded together with a metallic ductile joining material, preferably silver, copper, aluminum or an alloy of those metals, to form a brittle article. The parts to be joined in an initial unheated state are placed with the metallic ductile joining material between them in a high frequency alternating field with frequencies preferably from 100 to 500 kHz. Then the joining material is inductively heated locally to melt it by means of the alternating field and the parts are pressed together to form a sufficiently strong bond between the parts.

Abstract: A connection of an electrical terminal 13 to a conductor track 5 applied to a glass or glass ceramic plate 1 is to be resistant to temperature change and traction and conductive. For this purpose an electrically conductive connecting element 11 is ultrasonically welded to the composite consisting of the conductor track 5 and plate 1. The connecting element 11 extends to the terminal 13 which is fastened to the plate 1.

Abstract: The cooking apparatus has at least one cooking area including a glass-ceramic panel providing a cooking surface and at least one glass molded part made from glass with definite mechanical stability, such as technical glass or hardened glass. The glass molded part or parts act as an adapter for the glass-ceramic panel. In a preferred embodiment the glass-ceramic panel is bordered or enclosed by an assembly of the glass molded parts that form the adapter and protect the edges of the glass-ceramic panel. Some of the glass molded parts provide signaling and/or control panels, e.g. for residual heat. The glass molded parts replace prior art molded parts, such as eloxated aluminum and stainless steel parts, that are disadvantageously sensitive to direct mechanical surface loads.

Abstract: A connection of an electrical terminal 13 to a conductor track 5 applied to a glass or glass ceramic plate 1 is to be resistant to temperature change and traction and conductive. For this purpose an electrically conductive connecting element 11 is ultrasonically welded to the composite consisting of the conductor track 5 and plate 1. The connecting element 11 extends to the terminal 13 which is fastened to the plate 1.

Abstract: Protein mixtures are separated by utilizing membrane filtration. Filtration rates of at least 60%, preferably at least 70%, can be achieved when the liquid protein mixture to be separated is diluted at least tenfold, preferably twentyfold.

Abstract: The invention relates to a process for producing a tubular glass membrane with wall thicknesses between 5 and 30 microns and reproducible pore sizes between 11 A and 50 A. Alkali borosilicate glass is drawn into discrete hollow tubes and immediately cooled. The tubes are thermally treated to effect a phase separation into a coherent silicon dioxide phase and a boron oxide phase rich in alkali borate. The boron oxide phase is leached out with mineral acid. The tubes can be subsequently treated to give enlarged or reduced pores, asymmetric pores and coated surfaces.

Abstract: A device for diafiltration comprising a housing having an inlet, first and second outlets, a diaphragm disposed in the housing and means for sealing the diaphragm in the housing so that the material entering the inlet and not passing through the diaphragm is removed by the first outlet while the material passing through the diaphragm is removed from the housing through the second outlet characterized by the improvements of the diaphragms being formed by a plurality of capillary diaphragms arranged with the housing to require the least structural volume and each of the capillary diaphragms being an inorganic material, such as porous glass, which is chemically modified in a known manner, such as being treated with molecules including radicals, such as silane derivatives, with the functional groups.

Abstract: Glass surfaces are modified using controlled chemical corrosion to reduce reflection for a variety of existing optical and ophthalmic silicate glass compositions containing at least 5 weight % of alkali metal, using neutral or slightly alkaline aqueous solutions (pH: 7.0-8.5) at temperatures of 20.degree.-100.degree. C. The solutions contain an electrolyte having a dissociation constant greater than 10.sup.-6 and contain a polyvalent metal ion. Selection of the proper range of the ratio of glass surface area treated to treating solution volume is critical for achieving satisfactory results for optical applications as well as for making the process simple, repeatable, and inexpensive.Using this invention, antireflective surfaces may be produced on optical devices of complex configuration with high uniformity.

Abstract: An apparatus for a high pressure ultra-filtration of a permeate or filtrate from a crude solution characterized by a module having an inlet for the crude solution, an outlet for the crude solution, a pressure stable capillary diaphragm as the main filtration element, means holding the diaphragm in said module, the filtration element being of a structure most favorable to the flow techniques in which the capillary diaphragms are permeated from the outside toward the inside as the crude solution flows in the axial direction therealong under a flow pressure gradient, an outlet for the permeate passing into the capillary diaphragms and means for creating a flow pressure gradient on crude material being supplied to the module. Preferably, capillary diaphragms are porous glass capillaries which are secured at one end with the other end being closed and free to adjust its position in the module.

Abstract: A solar energy collecting unit is disclosed having an absorber for solar radiation comprising at least one hollow fiber having a heat-dissipating medium flowing therethrough. The hollow fibers used are preferably glass fibers, and preferably form the absorbing surface of the collecting unit.

Abstract: The invention relates to a process for producing a tubular glass membrane with wall thicknesses between 5 and 30 microns and reproducible pore sizes between 11 A and 50 A. Alkali borosilicate glass is drawn into discrete hollow tubes and immediately cooled. The tubes are thermally treated to effect a phase separation into a coherent silicon dioxide phase and a boron oxide phase rich in alkali borate. The boron oxide phase is leached out with mineral acid. The tubes can be subsequently treated to give enlarged or reduced pores, asymmetric pores and coated surfaces.