Polyacrylonitrile Composites Blended with Asphalt as a Low-Cost Material for Producing Synthetic Fibers: Rheology and Thermal Stability.

The results of rheological studies and thermal analysis of polymer compositions based on polyacrylonitrile copolymers (PAN) of different molecular weights and asphalt isolated by n-pentane solvent deasphalting are presented. It was found that the asphalt content in mixtures with PAN at the level of 10-30 wt.% improves the rheological properties of the polymer composite melt.

The rise and transformation of Bronze Age pastoralists in the Caucasus.

The Caucasus and surrounding areas, with their rich metal resources, became a crucible of the Bronze Age and the birthplace of the earliest steppe pastoralist societies. Yet, despite this region having a large influence on the subsequent development of Europe and Asia, questions remain regarding its hunter-gatherer past and its formation of expansionist mobile steppe societies. Here we present new genome-wide data for 131 individuals from 38 archaeological sites spanning 6,000 years.

The Genetic Origin of the Indo-Europeans.

The Yamnaya archaeological complex appeared around 3300BCE across the steppes north of the Black and Caspian Seas, and by 3000BCE reached its maximal extent from Hungary in the west to Kazakhstan in the east. To localize the ancestral and geographical origins of the Yamnaya among the diverse Eneolithic people that preceded them, we studied ancient DNA data from 428 individuals of which 299 are reported for the first time, demonstrating three previously unknown Eneolithic genetic clines. First, a "Caucasus-Lower Volga" (CLV) Cline suffused with Caucasus hunter-gatherer (CHG) ancestry extended between a Caucasus Neolithic southern end in Neolithic Armenia, and a steppe northern end in Berezhnovka in the Lower Volga.

[Dynamics of bone metabolism markers in oral fluid after surgical treatment of chronic periodontal disease with various osteoplastic materials].

The aim of the work was to assess the balance between osteosynthetic and osteodestructive processes in the oral cavity in patients with chronic generalized periodontitis (CGP) of moderate and severe severity in the dynamics of a remote period of patchwork using various bone-plastic materials (BPM) based on xenogeneic hydroxyapatite (HA), β-tricalcium phosphate (TCP). 123 patients with CGP were examined. Depending on the type of BPM, two groups were distinguished by composition in the course of patchwork operations.

[Diagnostic value of serum osteomarkers in moderate and severe periodontal disease].

The purpose of the study was to establish the diagnostic informative value of the concentration of osteomarkers in the serum to assess the severity of the osteodestructive component in chronic generalized periodontitis (HGP) prior to surgery and the prognosis of the effectiveness of surgical treatment of the disease. 187 patients with moderate and severe HGP who underwent bone and plastic insertion during the patch operations were examined. In the blood serum, the concentration of osteoprotegerin, ligand of the soluble activator of the kappa B nucleation factor (sRANKL) was initially determined and at 8 and 12 months after the operation, bone isoenzyme of alkaline phosphatase, osteocalcin, C-terminal telopeptides of degradation of mature type 1 collagen (β-CrossLaps).