Peculiarities of remodeling of hyalin cartilage at early stages of development of degenerative-distrophic processes of knee joints

The aim is to develop methods for detection of hyaline cartilage metabolic imbalance in patients with initial degenerative dystrophic changes in the substantiated pathogenetically knee. Material and Methods. Subject of inquiry: 50 women aged from 35 up to 57 (49.1 ±2.4), among them 36 patients with an early stage of knee osteoarthrosis made up an experimental group, 14 women without any musculoskeletal disease clinical presentations made up a control group. We carried out a complex examination including physical assessment, study of orthopaedic status, interview with the use of KOOS (Knee Injury and Osteoarthritis Outcome Score) scale, roentgenography and MRI of the knee and also a number of laboratory tests: enzyme-linked immunosorbent assay determination of the content of cytokine profile indices (IL-1, TNF-a, IL-6), cartilage oligomeric matrix protein (COMP) and bone (SerumCrossLaps and bone isozyme of alkaline phosphatase (BAP)) tissue metabolism markers in blood serum in all the groups of patients. Results. In all the patients of the experimental group the roentgenologic stage of osteoarthrosis was defined as 0-1 according to J. Lawrence and J. Kellgren, but at the same time knee degenerative changes were objectivized on the series of MR images in the form of MR signal changes of the articular cartilage, erosions and cysts, degenerative meniscus. We observed increased serum cartilage oligomeric matrix protein (COMP) in the same group and that is characteristic of hyaline cartilage destruction activation. We also detect disorders in bone tissue remodeling in the form of bone resorption intensification (Serum CrossLaps), osteogenesis increase (BAP) and activation of proinflammatory cytokine system link (IL-1, TNF-a). Conclusion. The leading pathogenetic links of the early degenerative changes of the knee are hyperproduction of proinflammatory cytokines (IL-1, TNF-a), destruction of the hyaline cartilage and disorder in bone tissue remodeling. Assessment of biochemical predictors of cartilage and bone tissue degradation along with the instrumental methods of diagnosis is of great theoretical and practical importance in the system of early detection of incipient osteoarthrosis.</p

The methods of deep periprosthetic infection diagnostics in the area of knee joint

The data on the methods and promising areas of investigations potent to improve diagnostic tactics in patients with infectious complications after total knee replacement is presented.</p

Climate change and tree growth in the Khakass-Minusinsk Depression (South Siberia) impacted by large water reservoirs

Regional and local climate change depends on continentality, orography, and human activities. In particular, local climate modification by water reservoirs can reach far from shore and downstream. Among the possible ecological consequences are shifts in plant performance. Tree-ring width of affected trees can potentially be used as proxies for reservoir impact. Correlation analysis and t-tests were applied to climatic data and tree-ring chronologies of Pinus sylvestris L. and Larix sibirica Ledeb. from moisture-deficit habitats in the intermontane Khakass-Minusinsk Depression, to assess modification of climate and tree growth by the Krasnoyarsk and Sayano-Shushenskoe Reservoirs on the Yenisei River. Abrupt significant cooling in May–August and warming in September-March occurred after the launch of the turbines in dams, more pronounced near the Sayano-Shushenskoe dam (up to – 0.5 °C in summer and to + 3.5 °C in winter) than near the Krasnoyarsk Reservoir headwaters (– 0.3 °C and + 1.4 °C). Significant lengthening of the warm season was also found for temperature thresholds 0–8 °C. Shifts of seasonality and intensity occurred in climatic responses of all tree-ring chronologies after development of water reservoirs. Patterns of these shifts, however, depended on species-specific sensitivity to climatic modification, distance from reservoirs, and physiographic regions. Mitigation of climate continentality and extremes by reservoirs appears to have offset possible negative effects of warming on tree growth. © 2021, The Author(s).Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Competitive Strength Effect in the Climate Response of Scots Pine Radial Growth in South-Central Siberia Forest-Steppe

This paper presents a method for classification of trees in groups depending on parameters of the age trend in tree-ring width. The method is tested on a sample containing 194 trees of Scots pine (Pinus sylvestris L.) growing in the forest-steppe zone of the South of Central Siberia. The climatic response of tree-ring width in such climatic conditions is complex. The influence of temperature in May-September is negative (moisture reducing). Warm-season precipitation serving as a source of moisture is a positive factor. Another positive factor is cold-season precipitation as frost protection. We determined the dependence of this response on the local conditions (soil, landscape and anthropogenic factors). The competitive strength of the trees influences both the sensitivity of individual trees to extreme climatic factors and the timing of growth processes. The latter implies the duration of the period of significant response to climate. It appears promising to take this influence into account in dendroclimatic reconstructions by using separate clusters of trees based on the competitive strength and having the maximum response to the reconstructed factor. Copyright © 2015 by The Tree-Ring Society.This item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive. For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at [email protected]

Tree rings reveal the impact of soil temperature on larch growth in the forest-steppe of siberia

Dendroclimatology has focused mainly on the tree growth response to atmospheric variables. However, the roots of trees directly sense the “underground climate,” which can be expected to be no less important to tree growth. Data from two meteorological stations approximately 140 km apart in southern Siberia were applied to characterize the spatiotemporal dynamics of soil temperature and the statistical relationships of soil temperature to the aboveground climate and tree-ring width (TRW) chronologies of Larix sibirica Ledeb. from three forest–steppe stands. Correlation analysis revealed a depth-dependent delay in the maximum correlation of TRW with soil temperature. Temperatures of both the air and soil (depths 20–80 cm) were shown to have strong and temporally stable correlations between stations. The maximum air temperature is inferred to have the most substantial impact during July–September (R = −0.46–−0.64) and early winter (R = 0.39–0.52). Tree-ring indices reached a maximum correlation with soil temperature at a depth of 40 cm (R = −0.49–−0.59 at 40 cm) during April–August. High correlations are favored by similar soil characteristics at meteorological stations and tree-ring sites. Cluster analysis of climate correlations for individual trees based on the K-means revealed groupings of trees driven by microsite conditions, competition, and age. The results support a possible advantage of soil temperature over air temperature for dendroclimatic analysis of larch growth in semiarid conditions during specific seasons. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]