Carbon Friction Pair in Total Hip Replacement

The article examines the advantages of a new pair of friction of the hip joint endoprosthesis made of pyrolytic carbon. The physico-mechanical and tribological characteristics of the material and their comparison with other materials used in the friction pair of hip joint endoprostheses are presented. Information is presented about the making of a material and its strength characteristics and the results of mathematical modeling of a friction pair. The results of a comparative research of the durability between a carbon pair of friction and a ceramic pair of friction

The State of Coral Reef Ecosystems of Southeast Florida

The northern extension of the Florida reef tract and a complex of limestone ridges run parallel to the subtropical Atlantic coastline of southeast Florida. Spanning 170 km from the northern border of Biscayne National Park (BNP) in Miami-Dade County to the St. Lucie Inlet in Martin County, the reefs and hardbottom areas in this region support a rich and diverse biological community (Figure 5.1). Nearshore reef habitats in southeast Florida include hardbottom areas, patch reefs and worm reefs (Phragmatopoma spp.) exhibiting abundant octocoral, macroalgae, stony coral and sponge assemblages. Offshore, coral reef associated biotic assemblages occur on linear Holocene Acropora palmata mid-shelf and shelf margin reefs that extend from Miami Dade County to Palm Beach County (Lighty, 1977; Figure 5.2). Anastasia Formation limestone ridges and terraces colonized by reef biota characterize the reefs from Palm Beach County to Martin County (Cooke and Mossom, 1929). The coastal region of southeast Florida is highly developed, containing one third of Florida’s population of 16 million people (U.S. Census Bureau, 2006). Many southeast Florida reefs are located just 1.5 km from this urbanized shoreline. Despite their unique position as the highest latitude reefs along the western Atlantic seaboard, the reefs of southeast Florida have only recently received limited scientific and resource management attention. Andrews et al. (2005) discussed the reefs of southeast Florida and the critical need to implement actions that fill resource knowledge gaps and address conservation and threats to reef health. This report further examines and updates the list of stressors imperiling the health of southeast Florida’s reefs, and presents information gained from new research, monitoring and management efforts to determine the extent and condition of reef resources in this distinctive region

ЦИТОГЕНЕТИЧЕСКИЙ СТАТУС БОЛЬНЫХ РАКОМ ЖЕЛУДКА

The aim was to identify cytogenetic disorders, proliferative activity and apoptosis in cells exfoliated buccal and nasal epithelium in patients with gastric cancer. The study involved 10 patients with an established diagnosis. The control group included 30 healthy people. It has been revealed that all this parameters were increased in buccal and nasal epithelium in patients with gastric cancer than in healthy people. The detected changes are systemic in nature and reflect the overall condition of the body. Moreover, we show reduction of karyological parameters after radical treatment, which indicates their prognostic significance.Целью было выявление цитогенетических нарушений, нарушений пролиферативной активности клеток и апоптоза в эксфолиативных клетках буккального и назального эпителия у больных с впервые диагностированным раком желудка. Обследовано 10 пациентов с установленными диагнозами. В группу контроля вошли 30 условно здоровых людей. Показано увеличение доли клеток с цитогенетическими нарушениями в буккальном и назальном эпителии у больных раком желудка по сравнению со здоровыми. Выявленные изменения носят системный характер и отражают общее состояние организма. Кроме того, показано снижение уровня кариологических показателей после радикального лечения, что свидетельствует об их прогностическом значении.

Nucleophilic activity of peroxyhydrocarbonate and Peroxocarbonate ions relative to 4-nitrophenyl Diethyl phosphonate

yesIn the present work, we carried out a detailed kinetic study of the decomposition of 4-nitrophenyl diethyl phosphonate (I), which is a model for several pesticides and chemical warfare agents. These studies may provide information for optimizing processes for the decomposition of ecologically toxic substancesBelgorod State Universit

Nucleophilic activity of peroxyhydrocarbonate and Peroxocarbonate ions relative to 4-nitrophenyl Diethyl phosphonate

In the present work, we carried out a detailed kinetic study of the decomposition of 4-nitrophenyl diethyl phosphonate (I), which is a model for several pesticides and chemical warfare agents. These studies may provide information for optimizing processes for the decomposition of ecologically toxic substancesyesBelgorod State Universit