2014 In the most general case the orientation distribution function (texture) is a function on the space of orthogonal transformations which splits into a couple of functions on the space of rotations. In the case of non-enantiomorphic crystal symmetry groups only one of these functions is independent. Sample symmetry (especially centrosymmetry) can be achieved in a trivial and a non-trivial wa...

We present a detailed analysis of finite energy solitary waves in twoand three-dimensional nonlinear periodic structures exhibiting a complete photonic band gap. Solitary waves in photonic crystals with a twodimensional ~2D! square and triangular symmetry group as well as a 3D fcc symmetry group are described in terms of an effective nonlinear Dirac equation derived using the slowly varying env...

In recent years, some investigations have been carried out to examine the assumptions like stationarity, symmetry and separability of spatio-temporal covariance function which would considerably simplify fitting a valid covariance model to the data by parametric and nonparametric methods. In this article, assuming a Gaussian random field, we consider the likelihood ratio separability test, a va...

The FLP protein of the 2 microns plasmid of Saccharomyces cerevisiae promotes conservative site-specific recombination between DNA sequences that contain the FLP recognition target (FRT). FLP binds to each of the three 13 base pair symmetry elements in the FRT site in a site-specific manner. We have probed both major and minor groove contacts of FLP using dimethyl sulphate, monoacetyl-4-hydroxy...

In the title compound, [Hg(C(42)H(38)N(4)O(2))](PF(6))(2)·2CH(3)CN, the Hg(II) cation lies on a twofold axis which is also the inter-nal symmetry element of the complete cationic complex. The Hg(II) cation is coordinated by two symmetry-related C(carbene) atoms [Hg-C = 2.058 (9) Å] in a nearly linear geometry, with a C-Hg-C angle of 175.8 (5)°. There are weak inter-molecular C-H⋯F inter-actions...

Crystals of rubredoxin oxygen oxidoreductase have been obtained and characterized. They belong to space group P2(1)2(1)2, with unit-cell dimensions a = 88.24 (15), b = 101.25 (7), c = 90.80 (3) A. The homodimer (86 kDa) in the asymmetric unit is related by a non-crystallographic twofold rotation axis parallel to the ab 'diagonal' direction, as shown by the self-rotation maximum in the section w...

We present the results of a combined experimental and numerical study of Taylor–Couette flow where both inner and outer cylinders rotate. Excellent quantitative agreement has been obtained between finite-element calculations and experimental measurements for a range of aspect ratios and rotation rates. Counter-rotation was found to enhance the breaking of the reflectional symmetry about the mid...