The chlorination by-products chloral hydrate and chloropicrine were assayed for genotoxicity in three short-term tests. Chloropicrine was 100-fold more potent than chloral in inducing mutations in… (More)

The infinitesimal action of κ-Poincaré group on κ-Minkowski space is computed both for generators of κ-Poincaré algebra and those of Woronowicz generalized Lie algebra. The notion of invariant… (More)

The Galilean invariance in threedimensional space-time is considered. It appears that the Galilei group in 2+1 dimensions posses a three-parameter family of projective representations. Their physical… (More)

We consider the deformed Poincare group describing the space-time symmetry of noncommutative field theory. It is shown that the deformed symmetry is equivalent to explicit symmetry breaking. PACS… (More)

A nonlinear transformation in the momentum space is constructed which converts the deformed action of Lorentz and Weyl generators on momenta into the standard one.

Some properties of central extensions of 2 + 1 dimensional Galilei group are discussed. It is shown that certain families of extensions are isomorfic. An interpretation of new nontrivial cocycle is… (More)

The quantum Galilei group Gκ is defined. The bicrossproduct structure of Gκ and the corresponding Lie algebra is revealed. The projective representations for twodimensional quantum Galilei group are… (More)