We consider the relations ≥ and ≥p on the collection of all knots, where k ≥ k (respectively, k ≥p k) if there exists an epimorphism πk → πk of knot groups (respectively, preserving peripheral systems). When k is a torus knot, the relations coincide and k must also be a torus knot; we determine the knots k that can occur. If k is a 2-bridge knot and k ≥p k, then k is a 2-bridge knot with determ...

For any module M over an associative ring R, let σ[M ] denote the smallest Grothendieck subcatgory of Mod-R containingM . If σ[M ] is locally finitely presented the notions of purity and pure injectivity are defined in σ[M ]. In this paper the relationship between these notions and the corresponding notions defined in Mod-R are investigated, and the connection between the resulting Ziegler spec...

The full distribution of the conductance P(G) in quasi-one-dimensional wires with rough surfaces is analyzed from the diffusive to the localization regime. In the crossover region, where the statistics is dominated by only one or two eigenchannels, the numerically obtained P(G) is found to be independent of the details of the system with the average conductance as the only scaling parameter...

1. The method of Kekwick & Mackay (1954) for the fractionation of human plasma protems was used successfully for the separation of the serum proteins ofguinea pig, rat, rabbit, cat, dog, monkey, ox, horse and sheep. 2. By variations in pH, ionic strength, temperature and solvent concentration, three fractions consisting essentially of a mixture of xand #globulins (G2); y-globulin (G 3) and albu...

This paper deals with a class of 2-step solvable simply connected Lie groups G in which we construct certain lattices Γ . It turns out that these are all the lattices in such groups. We then apply our results to study the decomposition of the quasi-regular representation of G on G/Γ .

The optimal treatment for pure membranous lupus nephritis (MLN) remains undetermined. Rituximab constitutes a promising therapeutic option for lupus nephritis and is currently being evaluated for use in idiopathic membranous nephritis. We retrospectively analysed the efficacy and tolerance of rituximab as a monotherapy in the induction treatment of pure MLN.We retrospectively investigated SLE p...

We introduce center-like subsets Z*(R,f), Z**(R,f) and Z1(R,f), where R is a ring and f is a map from R to R. For f a derivation or a non-identity epimorphism and R a suitably-chosen prime or semiprime ring, we prove that these sets coincide with the center of R.

The efficiency of the SIR ionization chamber versus photon energy has been obtained by an iterative method, starting from a few monoenergetic gamma-ray emitters. The relative standard uncertainty on the efficiency curve obtained is lower than 10(-2) above 65 keV. An efficiency curve for beta particles has been deduced in a similar manner, from measurements of (quasi-) pure beta emitters. The po...