Now showing items 31-40 of 63
On the rational cuspidal subgroup and the rational torsion points of Jo(pq)
For two distinct prime numbers p, q, we compute the rational cuspidal subgroup C(pq) of J0(pq) and determine the l-primary part of the rational torsion subgroup of the old subvariety of J0(pq) for most primes l.Some ...
The universal covers of certain semibiplanes
The universal covers of c.c*-geometries constructed from the length two orbits of certain involutory automorphism ofPG(2, q)are determined. It particular, we answer a question from .
Shimura subgroups of Jacobians of Shimura curves
Given an indefinite quaternion algebra of reduced discriminant D and an integer N relatively prime to D, one can construct Shimura curves Sh0(N, D) and Sh1(N, D), which are analogues of X0(N) and X1(N). The natural morphism ...
A dysfunctional desmin mutation in a patient with severe generalized myopathy
Mice lacking desmin produce muscle fibers with Z disks and normal sarcomeric organization. However, the muscles are mechanically fragile and degenerate upon repeated contractions. We report here a human patient with severe ...
X-ray and NMR structure of human Bcl-xL, an inhibitor of programmed cell death
THE Bcl-2 family of proteins regulate programmed cell death by an unknown mechanism1. Here we describe the crystal and solution structures of a Bcl-2 family member, Bcl-xL (ref. 2). The structures consist of two central, ...
High pressure Raman study and phase transitions of KIO3 non-linear optical single crystals
Potassium iodate KIO3 single crystal samples have been studied under pressure up to 35 GPa at room temperature. Drastic spectral changes and phase transitions were observed. The first phase transition occurs at 5. 0 GPa ...
Pressure-induced phase transitions of KTiOAsO4 by Raman spectroscopy
Potassium titanyl orthoarsenate KTiOAsO4 has been studied by Raman spectroscopy up to 16 GPa. Three first-order pressure-induced phase transitions are inferred from Raman data. The first phase transition takes place at 3. ...
On some locally 3-transposition graphs
Let ∑_n^ε be the graph defined on the (+)- points of an n-dimensional GF(3)-space carrying a nondegenerate symmetric bilinear form with discriminant ε, points are adjacent if they are perpendicular. We prove that if ε = ...
Williamson matrices and a conjecture of Ito's
We point out an interesting connection between Williamson matrices and relative difference sets in nonabelian groups. As a consequence, we are able to show that there are relative (4t,2,4t,2t)-difference sets in the dicyclic ...
Affine extensions of the Petersen graph and 2-arc-transitive graphs of girth 5
Let Qn denote the set of the flag-transitive geometries with the diagram. We construct examples of finite Qn-geometries for any n>= 2. This allows us to obtain new examples of finite 2-arc-transitive graphs of girth 5, ...