Abstract: The present invention relates to the application of biosynthetic engineering for the heterologous expression of a gene cluster for the biosynthesis of tetracycline compounds, notably chelocardin and its analogues. More particularly, the present invention pertains to a gene cluster encoding polypeptides involved in tetracycline biosynthesis, which gene cluster is suitable for heterologous expression of the biosynthetic pathway in a host cell. The present invention further pertains to DNA construct s comprising the gene cluster, to recombinant heterologous host cell s comprising the gene cluster or the DNA construct, to processes for the biosynthetic production of a tetracycline compound employing such recombinant host cells, and to tetracycline compounds thereby produced. The present invention also pertains to fusion proteins which are useful in the production of tetracycline compounds.

Abstract: The invention refers to a method and capacitive sensor for counting aerosol nanoparticles in an electric way. Aerosol particles, onto which a fluid was applied in an earlier process by known methods, change the capacitance of the dielectric of the capacitor when entering its field, which causes an electric signal. The method provides for detection of aerosol particles in a wide scope of their presence in the air and is not specific for any shape or chemical composition of nanoparticles.

Abstract: The object of the invention is the synthesis of threadlike tungsten oxide W5O14, in the presence of nickel at a temperature lower than 1000° C. Represented is a procedure for the synthesis of a highly homogeneous phase of the W5O14 compound from the vapor phase, in the presence of nickel, by means of a chemical transport method in a closed quartz ampoule. As an alternative example, a procedure is represented for the synthesis of the W5O14 compound in a through-flow reaction vessel. Both procedures yield electrically conductive threadlike crystals of the W5O14 compound. The synthesis is performed in vapor phase. Tungsten enters the reaction as a pure phase or via WS2±x, x?4, previously synthesized from the elements, and/or the source of tungsten may also be tungsten oxides WO3?Y, 0?y?1. Nickel may enter the reaction via NiI2, Ni(OH)2 and/or atomic nickel.

Abstract: The object of the invention is the synthesis of threadlike tungsten oxide W5O14, in the presence of nickel at a temperature lower than 1000° C. Represented is a procedure for the synthesis of a highly homogeneous phase of the W5O14 compound from the vapor phase, in the presence of nickel, by means of a chemical transport method in a closed quartz ampoule. As an alternative example, a procedure is represented for the synthesis of the W5O14 compound in a through-flow reaction vessel. Both procedures yield electrically conductive threadlike crystals of the W5O14 compound. The synthesis is performed in vapor phase. Tungsten enters the reaction as a pure phase or via WS2±x, x?0, previously synthesized from the elements, and/or the source of tungsten may also be tungsten oxides WO3?y, 0?y?1. Nickel may enter the reaction via NiI2, Ni(OH)2 and/or atomic nickel.

Abstract: The invention refers to a method and capacitive sensor for counting aerosol nanoparticles in an electric way. Aerosol particles, onto which a fluid was applied in an earlier process by known methods, change the capacitance of the dielectric of the capacitor when entering its field, which causes an electric signal. The method provides for detection of aerosol particles in a wide scope of their presence in the air and is not specific for any shape or chemical composition of nanoparticles.

Abstract: The object of the invention is a process for the synthesis of nanotubes of transition metal dichalcogenides, of fullerene-like nanostructures of transition metal dichalcogenides, of nanotubes of transition metal dichalcogenides, filled with fullerene-like nanostructures of transition metal dichalcogenides, of quasi one-dimensional structures (nanowires, microwires and ribbons) of transition metal oxides and of quasi one-dimensional structures of transition metal dichalcogenides, consisting of fine crystallites of transition metal dichalcogenides. The process is characterized in that the synthesis occurs by the chemical transformation of quasi one-dimensional compounds with a sub-micron diameter, described by the formula M6CyHz, 8.2<y+z?10, where M is a transition metal (Mo, W, Ta, Nb), C is a chalcogen (S, Se, Te), H is a halogen (I).

Abstract: The object of the invention is a process for the synthesis of nanotubes of transition metal dichalcogenides, of fullerene-like nanostructures of transition metal dichalcogenides, of nanotubes of transition metal dichalcogenides, filled with fullerene-like nanostructures of transition metal dichalcogenides, of quasi one-dimensional structures (nanowires, microwires and ribbons) of transition metal oxides and of quasi one-dimensional structures of transition metal dichalcogenides, consisting of fine crystallites of transition metal dichalcogenides. The process is characterized in that the synthesis occurs by the chemical transformation of quasi one-dimensional compounds with a sub-micron diameter, described by the formula M6CyH2, 8.2<y+z<10, where M is a transition metal (Mo, W, Ta, Nb), C is a chalcogen (S, Se, Te), H is a halogen (I).

Abstract: The present Invention relates a quasi-one-dimensional material with sub-micron cross-section described by the formula M6CyHz, where the M=transition metal, C=chalcogen, H=halogen, and where y and z are integers such that 8.2<y+z<10, which materials are synthesized in a Single-step procedure at temperatures above 1000° C. The present invention also concerns the use of these materials in electronic, chemical, optical or mechanical applications.

Abstract: The present invention pertains to the use of quasi-one-dimensional transition metal ternary compounds MxHyHaz (where M is a transition metal Mo, W, Ta, Nb; H is sulfur (S), selenium (Se), tellurium (Te); Ha is iodine (I)) and of doped quasi-one-dimensional transition metal ternary compounds MxHyHaz, (where M=Ta, Ti, Nb; H is sulfur (S), selenium (Se), tellurium (Te); Ha is iodine (I)) with elements of group 1b (silver) (Ag), gold (Au), or copper (Cu)) as electron emitters under the influence of an external electric field. The percentage of quasi-one-dimensional transition metal ternary compounds doped with elements of group 1b in the active material ranges from 0.01 to 99.9 the rest consisting of additives in the form of conducting, non-conducting or semi-conducting compounds or composites. Electron emission takes place at a pressure below 1 mbar.

Abstract: A process of the synthesis of nanotubes of transition metal dichalcogenides by chemical transport with the addition of fullerences is provided to obtain nanotubes of transistion metal dichalcogenides. The nanotubes are hexagonally arranged in form of needle-like bundles. The process comprises chemical transport, in which the fullerences exist in the vapour phase. The chemical fullerences are used at conditions, in which the fullerences exist in the vapour phase. The chemical transport reaction occurs in a quartz ampoule, sealed at a pressure lower than 0.66 Pa. The temperature in the hot part of the ampoule is higher than 830° C.