Clustering in ferronematics-The effect of magnetic collective ordering.

Clustering of magnetic nanoparticles can dramatically change their collective magnetic properties, and it consequently may influence their performance in biomedical and technological applications. Owing to tailored surface modification of magnetic particles such composites represent stable systems. Here, we report ferronematic mixtures that contain anisotropic clusters of mesogen-hybridized cobalt ferrite nanoparticles dispersed in liquid crystal host studied by different experimental methods-magnetization measurements, small-angle X-ray scattering (SAXS), small-angle neutron scattering (SANS), and capacitance measurements.

Unconventional Thermal and Magnetic-Field-Driven Changes of a Bipartite Entanglement of a Mixed Spin-(1/2,) Heisenberg Dimer with an Uniaxial Single-Ion Anisotropy.

The concept of negativity is adapted in order to explore the quantum and thermal entanglement of the mixed spin-(1/2,) Heisenberg dimers in presence of an external magnetic field. The mutual interplay between the spin size , XXZ exchange and uniaxial single-ion anisotropy is thoroughly examined with a goal to tune the degree and thermal stability of the pairwise entanglement. It turns out that the antiferromagnetic spin-(1/2,) Heisenberg dimers exhibit higher degree of entanglement and higher threshold temperature in comparison with their ferromagnetic counterparts when assuming the same set of model parameters.

Repair of DNA lesions in chromosomal DNA impact of chromatin structure and Cockayne syndrome proteins.

Decondensation of chromatin is essential to facilitate access to DNA metabolizing processes such as transcription and DNA repair. Disruption of histone-DNA contacts by histone modification or by ATP dependent chromatin remodelling allows DNA-binding proteins to compete with histones for DNA. The efficiency of global genome nucleotide excision repair (GGR) that removes a variety of helix distorting DNA lesions is known to be affected by chromatin structure most notably demonstrated by the slow repair of heterochromatin.