This work shines light on the role of extracellular polymeric substance (EPS) in formation and preservation elemental sulfur biominerals produced by sulfur-oxidizing bacteria. We characterized particles within a Sulfurovum -rich biofilm Frasassi Cave System (Italy). The adopt spherical bipyramidal morphologies, display both stable (α-S 8 ) metastable (β-S crystal structures. Elemental is embedd...

The new approach is developed for study of electron-positron pair production by a photon in oriented single crystal. It permits indivisible consideration of both coherent and incoherent mechanisms of pair creation and includes the action of field of axis (or plane) as well as the multiple scattering of particles of the created pair (the Landau-Pomeranchuk-Migdal (LPM) effect). From obtained int...

The present study is devoted to the problem of onset of oscillatory instability in convective flow of an electrically conducting fluid under an externally imposed time-independent uniform magnetic field. Convection of a low-Prandtl-number fluid in a laterally heated two-dimensional horizontal cavity is considered. Fixed values of the aspect ratio ~length/height54! and Prandtl number ~Pr50.015!,...

In this paper, we construct efficient schemes based on the scalar auxiliary variable (SAV) block-centered finite difference method for modified phase field crystal (MPFC) equation, which is a sixth-order nonlinear damped wave equation. The are linear, conserve mass and unconditionally dissipate pseudo energy. We prove rigorously second-order error estimates in both time space discrete norms. al...

The phonon dispersion relations of crystal lattices can often be well-described with the harmonic approximation. However, when potential energy landscape exhibits more anharmonicity, for instance, in case a weakly bonded or temperature is raised, approximation fails to capture all lattice dynamics properly. Phonon-phonon scattering mechanisms become important and limit lifetimes. We take novel ...

A fast Q-tensor method, which can model the defect dynamics in a liquid crystal director field, is presented. Conceptually based on the Oseen-Frank approach, we have added temperature energy density terms in addition to the strain energy terms, and an improved normalization method for fast calculations. The method is more compact and allows a larger time step than previous methods. The method i...

The first real-space x-ray image of an atomic structure was obtained by illuminating a crystal with white synchrotron radiation. The internal photocurrent signal served as a probe of the x-ray interference field strength at the atomic sites and was accordingly measured as a function of illumination direction to record the two-dimensional image. This novel method of real-space imaging makes use ...