摘要:
Novel, optimized highly alkaline proteases which are suitable for use in detergent formulations are prepared by employing microorganisms transformed by mutated DNA sequences. The mutated sequences are obtained starting from DNA sequences which code for highly alkaline protease usually produced by Bacillus species by altering these DNA sequences in defined positions by directed mutagenesis (point mutation) in such a way that the codon in which the point mutation is located now codes for an amino acid which is more strongly basic than the original amino acid. The result is highly alkaline proteases in which original amino acids have been replaced by more strongly basic amino acids, preferably by the amino acids lysine or arginine. Synthetic oligonucleotides, DNA sequences, vectors and transformed microorganisms which are used for generating and obtaining the optimized highly alkaline protease are also described.
摘要:
Enzymes are immboilized on an inorganic carrier which is a round, macropermeable agglomerate having a mulberry-type structure formed from spherical microporous .alpha.-aluminum oxide hydroxide particles. An organic polycondensate having free organic functional groups as enzyme binding sites penetrates the agglomerate. The .alpha.-aluminum oxide hydroxide particles of the agglomerate retain essentially their form prior to agglomeration. The polycondensate is prepared by reacting a polyimine with a dialdehyde or an epoxy compound. Preferably, the polyimine is polyethyleneimine, the dialdehyde is glutardialdehyde and the epoxy compound is an epoxy-functional silicon resin, an aliphatic diepoxide or an aliphatic triepoxide. The agglomerate is prepared by granulating the .alpha.-aluminum oxide hydroxide particles in the presence of the polyimine to form the agglomerate having the polyimine dispersed throughout and then reacting the polyimine with the dialdehyde or the epoxy compound. A preferred enzyme is glucose isomerase.
摘要:
A method for preparing perfluorinated heterocyclic compounds corresponding to the formulas Ia and Ib ##STR1## wherein m represents 3 or 4, andx is a --CF.sub.2 --O--CF.sub.2 -- group, a --CF.sub.2 --CF.sub.2 --CF.sub.2 -- group, or a --CF(CF.sub.3)--CF.sub.2 -- group,and their mixtures, and the perfluoro-N-cyclohexylmorpholine prepared by this method. The compounds are obtained by electrochemical perfluorination starting from corresponding cycloalkenyl derivatives, and they can be used for preparing medically usable aqueous emulsions, e.g. blood substitutes.
摘要:
In a process for adsorption cooling/conditioning of rooms, working media are used which comprise saturated aqueous solutions of calcium salts with an added organic polyhydroxy compound. The working media are distinguished by high salt contents and low salt precipitation temperatures at very low water vapor partial pressures and are suitable for use in continuously operated adsorption/desorption cycles of adsorption cooling/conditioning systems having high coefficients of performance.
摘要:
A method for producing trifluoroiodomethane in which a metal Mt selected from the group magnesium, zinc, cadmium, bismuth and tin is reacted in a first step (a) with a trifluorohalomethane, and the resulting reaction mixture is further reacted in a second step (b) with a component containing iodine to produce CF.sub.3 I. Compounds corresponding to the formula CF.sub.3.Zn.X.nL are also described.
摘要:
Benzodiazocines corresponding to the formula ##STR1## are converted to benzodiazepines corresponding to the formula ##STR2## of claim 1 by subjecting the benzodiazocine (a) if it is halogen-substituted in the 3-position to a thermal treatment which may also take place in the presence of a nucleophilic agent for the reaction or (b) if the 3-position is hydroxy substituted to treatment with a Lewis acid which is a chlorinating or brominating agent. Whenever the diazepine obtained as the final product has a 2-halogenomethyl group it may then be converted to benzodiazepine which is otherwise substituted in the 2-position.
摘要:
A catalyzer for detoxifying exhaust gases from an internal combustion engine wherein a monolithic catalyst body is supported within a housing having a composite damping arrangement placed in the housing between the catalyst body and the housing walls and having a portion extending axially of the catalyst body for damping radial forces acting on the body, and end portions for damping axial forces acting on the catalyst body, means cooperating with the damping means for elastically suspending the catalyst body in the housing and protecting rings positioned between the elastic holder and the catalyst body to further protect the edges of the catalyst body against destructive forces thereon.
摘要:
A process for preparing a synthetic substantially crystalline sodium aluminosilicate of the zeolite A type is disclosed. The process comprises rapidly and simultaneously introducing a sodium silicate and a sodium aluminate solution under thorough agitation at a constant by volume ratio which provides for a reaction mixture the content of which is equivalent to a molar ratio of x' Na.sub.2 O/ 1 Al.sub.2 O.sub.3 / y SiO.sub.2 /z' H.sub.2 O wherein x' is from about 6.5 to about 9.0, y is from about 1.7 to about 2.2 and z' is from about 180 to about 250, maintaining the reaction mixture at a temperature of from about 70.degree. to about 100.degree. C. under stirring for a sufficient period of time, usually 1-3 hours, in order to allow the initially amorphous reaction product to crystallize and recovering the substantially crystalline product from the resulting suspension. The essential feature of the process is a continuously maintained constant molar ratio Na.sub.2 O/ Al.sub.2 O/ SiO.sub.2 /H.sub.2 O throughout the reaction mixture during the entire course of the process. The resulting product exhibits a small particle size, an excellent wettability and a high calcium binding power, and is especially suited as a detergent additive.
摘要翻译:公开了一种制备沸石A型合成基本上结晶的硅铝酸钠的方法。 该方法包括快速并同时在体积比不变的充分搅拌下引入硅酸钠和铝酸钠溶液,其提供反应混合物,其含量相当于x'Na 2 O / 1 Al 2 O 3 / y SiO 2的摩尔比 / z'H 2 O,其中x'为约6.5至约9.0,y为约1.7至约2.2,z'为约180至约250,将反应混合物保持在约70℃至约100℃的温度 在搅拌下足够的时间,通常为1-3小时,以使最初的无定形反应产物从所得悬浮液中结晶并回收基本上结晶的产物。 该方法的基本特征是在整个过程中在整个反应混合物中持续恒定的摩尔比Na 2 O / Al 2 O / SiO 2 / H 2 O。 所得产品具有小的粒度,优异的润湿性和高的钙结合力,并且特别适合作为洗涤剂添加剂。
摘要:
A process for brominating fluorine- and chlorine-containing halogenated hydrocarbons of formula (I) ##STR1## wherein R.sub.1 represents hydrogen, fluorine, chlorine, bromine, lower alkyl, or at least partially fluorinated lower alkyl; R.sub.2 represents hydrogen, fluorine, chlorine, or bromine; and, R.sub.3 represents fluorine or perfluorinated lower alkyl, to form the corresponding compounds of formula (II) ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above is disclosed. According to this process, compounds of formula (I) are reacted in gaseous form at relatively mild reaction conditions, e.g., reaction temperatures of between 100.degree.-500.degree. C. with hydrogen bromide in the presence of a catalyst comprising at least one component selected from the group consisting of(a) active carbon,(b) silica gel,(c) active alumina, and(d) a bromide of an element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Zn, Cd, Cu, Ag, Al, Tl(I), Pb, Cr, Mn, Fe, Co, Ni, rare earth metals and metals of the platinum group.
摘要:
In an apparatus for cleaning exhaust gases comprising a rigid housing forming an outer wall of the exhaust conduit, a pocket formed at each end of the housing, a pair of accordion-shaped or corrugated wall and resilient compensating devices placed at each end into the pockets and each having gripping end portions, a catalyzer body of the monolithic type being placed between the gripping end portions for suspension axially within the housing with a gap in the housing.