Evolution of Restriction-Modification Systems Consisting of One Restriction Endonuclease and Two DNA Methyltransferases.

Some restriction-modification systems contain two DNA methyltransferases. In the present work, we have classified such systems according to the families of catalytic domains present in the restriction endonucleases and both DNA methyltransferases. Evolution of the restriction-modification systems containing an endonuclease with a NOV_C family domain and two DNA methyltransferases, both with DNA_methylase family domains, was investigated in detail.

New Spin-Polarized Electron Source Based on Alkali Antimonide Photocathode.

New spin-dependent photoemission properties of alkali antimonide semiconductor cathodes are predicted based on the detected optical spin orientation effect and DFT band structure calculations. Using these results, the Na_{2}KSb/Cs_{3}Sb heterostructure is designed as a spin-polarized electron source in combination with the Al_{0.11}Ga_{0.

Interlayer Coupling of a Two-Dimensional Kondo Lattice with a Ferromagnetic Surface in the Antiferromagnet CeCoP.

The f-driven temperature scales at the surfaces of strongly correlated materials have increasingly come into the focus of research efforts. Here, we unveil the emergence of a two-dimensional Ce Kondo lattice, which couples ferromagnetically to the ordered Co lattice below the P-terminated surface of the antiferromagnet CeCoP. In its bulk, Ce is passive and behaves tetravalently.

Topological Magnetic Materials of the (MnSbTe)·(SbTe) van der Waals Compounds Family.

Using density functional theory, we propose the (MnSbTe)·(SbTe) family of stoichiometric van der Waals compounds that harbor multiple topologically nontrivial magnetic phases. In the ground state, the first three members of the family ( = 0, 1, 2) are 3D antiferromagnetic topological insulators, while for ≥ 3 a special phase is formed, in which a nontrivial topological order coexists with a partial magnetic disorder in the system of the decoupled 2D ferromagnets, whose magnetizations point randomly along the third direction. Furthermore, due to a weak interlayer exchange coupling, these materials can be field-driven into the FM Weyl semimetal ( = 0) or FM axion insulator states ( ≥ 1).

Topologically Nontrivial Phase-Change Compound GeSbTe.

Chalcogenide phase-change materials show strikingly contrasting optical and electrical properties, which has led to their extensive implementation in various memory devices. By performing spin-, time-, and angle-resolved photoemission spectroscopy combined with the first-principles calculation, we report the experimental results that the crystalline phase of GeSbTe is topologically nontrivial in the vicinity of the Dirac semimetal phase. The resulting linearly dispersive bulk Dirac-like bands that cross the Fermi level and are thus responsible for conductivity in the stable crystalline phase of GeSbTe can be viewed as a 3D analogue of graphene.