Abstract:
The invention relates to 16S rRNA comprising a mutation at A1196, and to 16S rRNA further comprising a mutation at C1195 and/or A1197, and to 16S rRNA which comprises (i) C1195A and A1196G; or (ii) C1195T, A1196G and A1197G; or (iii) A1196G and A1197G. The invention also relates to ribosomes comprising such 16S rRNAs and to use of same.
Abstract:
Hydroxypivalic acid can be prepared by oxidation of hydroxypivalaldehyde with hydrogen peroxide by metering the hydrogen peroxide, as the oxidizing agent, into an aqueous hydroxypivalaldehyde reservoir in the temperature range from 60.degree. to 80.degree. C. such that a hydrogen peroxide concentration of 4% by weight, based on the total weight of the reaction mixture, is not exceeded, and ending the addition of hydrogen peroxide as soon as the concentration of hydroxypivalaldehyde in the reaction mixture falls below 1% by weight.
Abstract:
o-Hydroxy-benzaldehydes can be obtained by oxidation of the o-cresols, on which they are based, with oxygen in the presence of substances having a base reaction in a solvent if chelate complexes of iron, manganese or a mixuture of both with polyaza-macrocycles as chelating agents are employed as catalysts. Copper or a copper compound is advantageously added as a co-catalyst.
Abstract:
In flue gases or other humid exhaust gases which are relatively cold and contain SO.sub.2, NO.sub.2 and other gaseous pollutants, the SO.sub.2 content is oxidized to SO.sub.3 and the NO content is reduced by a catalytic treatment, the SO.sub.3 content is condensed as sulfuric acid and other gaseous pollutants are removed by being scrubbed with aqueous liquids at low temperatures. In order to heat up the flue gas to the temperature required for the catalysis, the flue gas is heated up in a first heating-up stage by an indirect heat exchange with the catalytically treated gas before the catalytic treatment, the heated-up gas is heated up further in a second heating-up stage to the temperature required for the catalytic treatment, the catalytically treated gas which has been cooled in the first heating-up stage is cooled further in an indirect heat exchanger below the dew point temperature of sulfuric acid and is subsequently fed to an SO.sub.3 condenser. The remaining sulfuric acid vapor is absorbed by sprayed dilute sulfuric acid to form a dilute sulfuric acid having a predetermined concentration, the gas leaving the SO.sub.3 condenser is scrubbed in a scrubber with a sprayed aqueous liquid and is thus cooled to 40.degree. to 60.degree. C. and the purified gas is reheated to the required chimney inlet temperature.
Abstract:
There is provided a method for evolving an orthogonal rRNA molecule, comprising the steps of: providing one or more libraries of mutant orthogonal rRNA molecules and introducing the libraries into cells such that the orthogonal rRNA is incorporated into ribosomes to provide orthogonal ribosomes; providing one or more orthogonal mRNA molecules which (i) are not translated by natural ribosomes, and (ii) comprise one or more orthogonal mRNA codons; assaying the translation of the orthogonal mRNA and selecting the orthogonal rRNA molecules which translate the orthogonal mRNA, wherein the assay in step (c) requires translation of one or more orthogonal mRNA codons in the orthogonal mRNA; and orthogonal ribosomes incorporating such rRNA molecules.
Abstract:
The invention relates to a method of making a polypeptide comprising an orthogonal functional group, said orthogonal functional group being comprised by an aliphatic amino acid or amino acid derivative, said method comprising providing a host cell; providing a nucleic acid encoding the polypeptide of interest; providing a tRNA-tRNA synthetase pair orthogonal to said host cell; adding an amino acid or amino acid derivative comprising the orthogonal functional group of interest, wherein said amino acid or amino acid derivative is a substrate for said orthogonal tRNA synthetase, wherein said amino acid or amino acid derivative has an aliphatic carbon backbone; and incubating to allow incorporation of said amino acid or amino acid derivative into the polypeptide of interest via the orthogonal tRNA-tRNA synthetase pair. The invention also relates to certain amino acids, and to polypeptides comprising same.
Abstract:
An electrolysis cell for preparing alkali metals from a liquid alkali metal heavy metal alloy, including a tube arranged essentially horizontally having a closure device at each of the two ends of the tube. At least one solid electrolyte tube arranged concentrically in the tube and oriented with openings towards one end of the tube such that a first annular gap for conducting a liquid alkali metal, which forms an anode, is present between the inside of the tube and the outside of the solid electrolyte tube. An interior space in the solid electrolyte tube, sealed off from an alloy inlet, first annular gap and an alloy outlet, accommodates liquid alkali metal that can be used as a cathode.
Abstract:
Hydroxypivalic acid is obtained from aqueous solutions by removal of the water by azeotropic distillation and subsequent crystallization from a solvent mixture which is composed of a polar and a non-polar component. The distillation is carried out under reduced pressure and at a maximum bottom temperature of 90.degree. C., until a residual water content of at least 0.1% of the total weight of the resulting solution is achieved.
Abstract:
Flue gases or other contaminated humid exhaust gases which contain SO.sub.3 are cooled by an indirect heat exchange in a heat exchanger to a temperature below the dew point temperature of sulfuric acid and are cooled further to a predetermined temperature in an SO.sub.3 condenser by means of dilute sulfuric acid, which is sprayed to flow in a countercurrent to the gas, whereby dilute sulfuric acid having a predetermined concentration is condensed. The gas leaving the SO.sub.3 condenser is scrubbed and cooled to a temperature from 40.degree. to 55.degree. C. in a fine scrubber by a treatment with a sprayed aqueous liquor. The exit gas is reheated to a predetermined temperature in a reheater by a treatment with sprayed dilute sulfuric acid from the SO.sub.3 and after the condensation of SO.sub.3 is passed through a filter. Dilute sulfuric acid from the reheater is sprayed into the SO.sub.3 condenser. The temperature of the gas in the reheater is so selected that the water which has been absorbed is not condensed but remains in the gaseous effluent. The exit temperature of the gas leaving the heat exchanger is approximately so selected that the temperature at which dilute sulfuric acid becomes available is approximately the same as the temperature of the gas in the reheater. The rate at which dilute sulfuric acid is sprayed is so adjusted that the dilute sulfuric acid withdrawn from the fine scrubber is at a temperature which is approximately the same as the required exit temperature of the gas leaving the SO.sub.3 condenser.
Abstract:
To facilitate assembly of an automotive alternator, the alternator housing (11) is separated into two axially split half-shells (11a, 11b), the dividing line (11c) preferably passing through the axis of the shaft (18) of the alternator. The alternator assembly is made by providing a subassembly including the shaft, electromagnetic rotor structure, bearings, and a disk element in which rectifier diodes are seated and which can also support holders in engagement with the slip rings and the voltage regulator. The stator is slipped around the subassembly, a fan wheel and pulley can be attached to the subassembly which is then placed into one half-shell. The bearings and the concentric elements are positioned in alignment by seats formed in the half-shell, and the axial alignment can be accurately checked, and if the alignment is found proper, the second half-shell is assembled thereover.