Vanadium is reported to undergo a pressure-induced bcc-rhombohedral phase transition at 30--70 GPa, with pressure that sensitive the hydrostaticity of sample environment. However, experimental evidence for structure high-pressure being rhombohedral surprisingly weak. We have restudied vanadium under 154 GPa using both polycrystalline and single-crystal samples, variety different transmitting me...

To investigate the nature of the hexagonal lattice structure in Descemet's membrane, monoclonal antibodies were raised against a homogenate of bovine Descemet's membranes. They were screened by immunofluorescence microscopy to obtain antibodies that label Descement's membrane. Some monoclonal antibodies labeled both Descemet's membrane and fine filaments within the stroma. In electron microscop...

ü Define the geometry of the system and assign an index number to each cell. Specify the topology by listing the neighbours of each cell. latticevector1 = N@8Sqrt@3D, 0<D;H* for hexagonal lattice *L latticevector2 = N@8Sqrt@3D ê 2, 3 ê 2<D; H* for hexagonal lattice *L addresses = Flatten@Table@8ja, jb<, 8ja, 0, n1 1<, 8jb, 0, n2 1<D, 1D; H* list of lattice addresses of the cells in the patch *L...

Spatial resonances leading to superlattice hexagonal patterns, known as "black-eyes," and superposition patterns combining stripes and/or spots are studied in a reaction-diffusion model of two interacting Turing modes with different wavelengths. A three-phase oscillatory interlacing hexagonal lattice pattern is also found, and its appearance is attributed to resonance between a Turing mode and ...

In this paper, using annular resonator we have designed an adding and dropping filter light based ontwo-dimensional photonic crystals. The shape of ring resonator filter adding and dropping that wehave proposed is Race Track. This filter has a hexagonal lattice structure of silicon bars withrefractive index 3/46 that is located in the context of air with refractive index 1. Transmissionefficien...

Using density functional total energy calculations the structural phase stability and pressureinduced structural transition in different polymorphs of ZnSiO3 and Zn2SiO4 have been studied. Among the considered possible ZnSiO3 polymorphs, monoclinic phase with space group P21/c is found to be the most stable one. At high pressure monoclinic ZnSiO3 (C2/c) can coexist with orthorhombic (Pbca) modi...

TEM analysis of mesoporous materials is generally undertaken to give qualitative results. Accurate quantitative analysis is demonstrated in this study. A systematic image analysis of a powder form of a hexagonal mesoporous material known as KIT-6 is conducted using a transmission electron microscope (TEM). Three types of image contrast typically appear in this material (a hexagonal honeycomb st...

Symmetry is rarely found on cellular surfaces. An exception is the brush border of microvilli, which are essential for the proper function of transport epithelia. In a healthy intestine, they appear densely packed as a 2D-hexagonal lattice. For in vitro testing of intestinal transport the cell line Caco-2 has been established. As reported by electron microscopy, their microvilli arrange primari...

Neural encoding of navigable space involves a network of structures centered on the hippocampus, whose neurons -place cells - encode current location. Input to the place cells includes afferents from the entorhinal cortex, which contains grid cells. These are neurons expressing spatially localized activity patches, or firing fields, that are evenly spaced across the floor in a hexagonal close-p...