摘要:
An automatic culture apparatus includes an airtight casing, a culture vessel platform, a culture observation platform and a separation/distribution work platform disposed in layered configuration with suitable vertical spacings between them. A drive system for the apparatus comprises an opening formed centrally in each of the platforms; a culture vessel carrier for conveying a culture vessel to each of the platforms through the openings; a transfer arm for loading and unloading a culture vessel on or from the carrier and any one of the platforms; a first drive mechanism for operating the carrier and the transfer arm; and a second drive mechanism for driving any one of the platforms. The second drive mechanism is mounted hermetically in the casing. By operating suitable drive mechanisms to actuate the various parts, a culture vessel may be automatically transferred and distributed on each of the platforms without causing contamination in a safe and efficient manner, for automatic growth of the medium being cultured under an optimum environment.
摘要:
The present invention relates to an anticorrosion primer coating composition comprising (i) a polyvinyl butyral resin, (ii) an organo functional silane, (iii) at least one member selected from the group consisting of inorganic borate compounds and polyphosphate compounds, and (iv) phosphoric acid.
摘要:
Organosilanes containing silicon-bonded oxime groups, i.e., ketoximosilanes, are prepared by reacting an halogenosilane with an alkali metal oxime, using no acid acceptors. This method of preparation is safe from the potentiality of explosive hazards that may exist inadvertently or inherently in the conventional reaction system, and also capable of producing amine chloride-free products.
摘要:
In a Rochow process, organohalosilanes are prepared by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst and a co-catalyst. The invention uses as the co-catalyst a powder of co-catalyst active element-copper alloy containing substantial strain energy because this co-catalyst can reduce the activation time taken until a steady state is reached, which has been an outstanding problem in Rochow reaction, maintain the steady state over time and increase the selectivity of desired diorganodihalosilane for eventually increasing the yield based on the starting silicon.
摘要:
When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder, a copper catalyst and a co-catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, the catalyst and/or co-catalyst used in the contact mass is obtained by mixing particles of the catalyst and/or co-catalyst with finely divided silica, and applying shear forces to the mixture for mutually rubbing the particles, thereby producing the catalyst and/or co-catalyst having finely divided silica fused to surfaces thereof. The invention is successful in producing organohalosilanes at a significantly improved formation rate without reducing the proportion of diorganodihalosilane.
摘要:
Organohalosilanes are prepared by reacting an organic halide with metallic silicon particles in the presence of a metallic copper catalyst which is a metallic copper powder in flake form having a bulk specific gravity of 1-3 g/cm3 and a mean particle size of 10 &mgr;m to 1 mm as measured by laser diffraction particle size distribution analysis.
摘要翻译:有机卤代硅烷通过在金属铜催化剂的存在下使有机卤化物与金属硅颗粒反应来制备,金属铜催化剂是片状比重为1-3g / cm 3,平均粒径为10〜 通过激光衍射粒度分布分析测量为1mm。
摘要:
The present invention provides a mounting structure of a rotary shaft of rotary electric machinery in which it is possible to cope with vibration of the rotary shaft in an axial direction with a low parts count. A fitting groove into which a portion of a rear side stopper is fitted is formed at a rear end portion of the rotary shaft. A rear side stopper has three projecting chips fitted into the fitting groove and three leaf spring chips in contact with an inner ring of a rolling bearing forming a bearing structure. The rear side stopper has a structure in which the rear side stopper generates spring force for restoring an original shape thereof when the rear side stopper is compressed in an axial direction of the rotary shaft. The rear side stopper is disposed in a compressed state between a wall face surrounding the fitting groove and the inner ring of the rolling bearing.
摘要:
Disclosed is a method of producing dimethylpolysiloxanes through hydrolysis of dimethyldichlorosilane wherein a water solution containing a water-soluble oxygen-containing organic compound is introduced into dimethyldichlorosilane. Therein, linear dimethylpolysiloxanes alone having both ends blocked with chlorine atoms can be selectively produced by properly controlling the water content in the hydrolysis system and further by rendering the hydrolysis system acidic, and cyclic dimethylpolysiloxanes alone can also be selectively produced by properly controlling the water content in the hydrolysis system and optionally rendering the hydrolysis system acidic.
摘要:
There is provided a novel organosilicon compound, 1,3-bis(p-hydroxybenzyl)-1,1,3,3-tetramethyldisiloxane. It is prepared by silylating 1,3-bis(p-methoxybenzyl)-1,1,3,3-tetramethyldisiloxane with trimethylsilyl iodide, followed by desilylation.
摘要:
Cycloalkyl silane compounds such as cyclohexyl methyl dichlorosilane can be efficiently prepared by the photochemically induced hydrosilylation reaction. For example, an equimolar mixture of cyclohexene and methyl dichlorosilane with admixture of a catalytic amount of a platinum catalyst, which is an alcohol complex of chloroplatinic acid, is irradiated at a temperature of 70.degree. C. with ultraviolet light so that the hydrosilylation reaction takes place and proceeds almost to completeness without deactivation of the platinum catalyst to give the desired product in a yield of 90% or even higher. Unexpectedly, the efficiency of the reaction can be greatly increased when the platinum catalyst is prepared by heating a solution of chloroplatinic acid in 2-ethylhexyl alcohol at 50.degree. to 80.degree. C. for at least 4 hours.