摘要:
The invention relates to a method and means for the rapid identification of mutations. The test strains used in the invention contain a reporter system and a selection marker. An antibiotic resistance protein which after mutation allows the selective growth of the revertant and the targeted induction of the inducible reporter system of the developing revertants acts as the selection marker. Proteins that are capable of directly or indirectly triggering a measuring signal are used as the reporters. The mutations are identified by means of the reporter signal of the developing revertants, in such a way that the evaluation can take place after only a few hours.
摘要:
Disclosed herein is the polymerization of monodisperse microencapsulated monomer droplets to produce monodisperse non-microencapsulated bead polymers through the addition strong alkalis or strong acids during the polymerization.
摘要:
Cycloolefin copolymers for use for optical data memories, can be prepared by copolymerization of monomers from the group consisting of cyclic olefins, &agr;-olefins having 2 or more C atoms and optionally conjugated or non-conjugated diolefins, the catalysts employed being metallocene compounds or &pgr; complex compounds of the formula in which CpI and CpII represent carbanions having a cyclopentadienyl-containing structure, &pgr;I and &pgr;II represent charged or electrically neutral &pgr; systems, D represents a donor atom and A represents an acceptor atom, where D and A are linked by a reversible coordinate bond such that the donor group assumes a positive (part) charge and the acceptor group assumes a negative (part) charge, M represents a transition metal of sub-group III, IV, V or VI of the Periodic Table of elements (Mendeleev), including the lanthanides and the actinides, X denotes an anion equivalent and n denotes the number zero, one, two, three or four, depending on the charge of M.
摘要:
Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.
摘要:
Olefins are polymerized with a catalyst system resulting from the combination of unbridged substituted indenyl cyclopentadienyl metallocenes and an organoaluminum cocatalyst.
摘要:
The invention relates to a method for breaking down biological material, especially for obtaining biomolecules by ultrasound, the biological material being arranged, in a container together with a liquid.
摘要:
Unbridged metallocenes of titanium, zirconium and hafnium having an unsubstituted cyclopentadienyl radical and an indenyl radical having in at least one of the 1, 2, or 3 positions a substitutent selected from hydrocarbon radicals and trialkylsilyl radicals, and their use in the polymerization of olefins.
摘要:
The invention relates to a method for breaking down biological material, especially for obtaining biomolecules by ultrasound, the biological material being arranged, in a container together with a liquid.
摘要:
Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.