Estimation Of Regeneration Research Articles

Estimation of regeneration using environmental variables and spectral indices in ecosystems with forest fires

The problem of forest fires requires creating methodologies that allow evaluating and predicting the response that the ecosystem willhave to the impact of fire, in order to direct restoration actions in the areas that most require it. However, evaluating these areasdirectly in the field implies investment of resources (financial and personnel) which, along with time, are generally limited. For this,satellite images are a practical tool for the evaluation of large areas, or inaccessible areas, impacted by forest fires. In this work, thecorrelation presented by different variables measured in the field and derived from remote sensors, in relation to the naturalregeneration of pine that occurs in the La Primavera forest and in Sierra de Quila, Jalisco, was evaluated. The results showeddifferent variables to determine the predictive models of the natural regeneration of pine after the occurrence of a forest fire, beingthe fuels of 100 hours and 1000 hours, bark thickness and depth of burning, the variables taken directly in the field. that wereincluded in the models. While the burn area index, the regeneration index and the exposure, the variables taken by remote censorswere included in the predictive models. The models that showed a higher R² are those obtained by field variables for the tworegions. However, the model obtained only with remote sensor variables for La Primavera obtained an R² of 0.6083, Contrary toSierra de Quila where the model does not take any spectral index for the model, therefore it is advisable to establish a greaternumber of Sampling sites evenly distributed throughout the area affected by the fire, to improve the accuracy of the remote sensingmodels

Ecological characterization and evolution of Elaeis guineensis Jacq. traditional parklands in Lower Casamance (Senegal)

This study is a contribution to the characterization of traditional agroforestry parklands in Lower Casamance. It aims at determining the diversity of species and the tree size structure in these parklands, as well as at identifying the threats to their sustainability, in order to assist decision making on natural resource conservation. To this end, 45 plots of 50 × 50 m size were inventoried. In each plot, an exhaustive inventory of trees was performed, including species identification, height measurement and estimates of regeneration and mortality rates. Additionally, 116 stakeholders were interviewed about their management practices, the revenue they obtained from agroforestry parklands, and their opinion on the future of these parks. A total of 2739 Elaeis guineensis palm trees and 3948 trees from other species were observed in the 11.25 ha studied. Hence a relative density of 40.96 individuals of E. guineensis ha−1. The 63 species belonged to 51 genus within 23 botanical families. The analysis of tree communities indicated a strong role of human management on the species composition of parklands, with cultural value trees near the villages and wood production trees further away, and with some sites having more trees with medicinal uses. The distribution of tree sizes of E. guineensis and estimates of mortality and regeneration rates indicated that the population of palm trees is ageing and regeneration is too low to compensate mortality. Based on interviews, palm production is decreasing in the area, and causes of decline identified by the farmers were salinization, drought, illegal cutting, and bush fires, i.e., both natural and anthropogenic causes. In view of the importance of these parklands for the local economy and food security, better management of E. guineensis parklands is required to ensure their sustainability.

МОРФОЛОГИЧЕСКАЯ ХАРАКТЕРИСТИКА РЕГЕНЕРАТА КОСТЕЙ ПРЕДПЛЕЧЬЯ КРОЛИКА ПРИ СТИМУЛЯЦИИ БАТ

The article presents the study of features of formation and remodeling of distraction graft of rabbits’ forearm bones at the passage of transosseous elements through acupuncture points. The aim of the work was to develop and perform quantitative estimation of regenerative process at the healing of forearm bone fractures using morphometric researches. We studied morphofunctional changes of graft on different stages of ossification using morphoscopy and morphometry and compared their quantitative characteristics with the ones in intact bone. Used index systems of estimation of regeneration processes at the healing of forearm bone fractures allow to reveal larger degree of statistical significance of obtained results not only in comparison with intact bone but also in over the time of experiment. Using quantitative variables and index estimation of regenerative processes at the healing of forearm bone fractures allow not only to objectify character of their changes but also to predict variability of its value.

Evaluation of large intestinal mucosa regeneration in ulcerative colitis using linear measurements

Bronchoalveolar lavage is a procedure of washing out of the lungs and the lavage fluid may contain different immunophenotypisation cells. Accordingly, the analysis of bronchoalveolar lavage fluid is an important part in diagnosis of interstitial lung diseases. The aim of this study was the examination of cellular composition of the lavage fluid in patients with lung sarcoidosis. MATERIAL AND METHODS This prospective study included 58 patients (30 women, 28 men), average age 42+ 10.32 years, who underwent standard biochemical analysis, lung radiography, lung function, analysis as well as analysis of cellular composition and immunophenotypisation of lavage fluid cells. 43/58 patients had the first radiological stage of sarcoidosis; 8/58 had second and 7/58 had third radiological stage of sarcoidosis. The majority of patients had preserved lung ventilation (71%), changes in small airways and obstructive ventilation disorder was established in 22% patients, and 7% of' patients presented with restrictive ventilation disorder. The pulmonary transfer factor for CO and transfer coefficient were reduced in 40/58 patients (69%), even in those with normal ventilation. The majority of patients 53/58 had hypercellular lavage fluid, 96.55% of patients had lymphocytic alveolitis (x 34%) in regard to relative reduction of alveolar macrophage (x 63%). The immunophenotypisation of lavage fluid done in 25 patients showed the domination of CD4+ lymphocyte (x 54%) and raised ratio CD4+/CD8+. Our results show that lymphocytic alveolitis is one of the best criteria in the diagnosis of pulmonary sarcoidosis.

Use of biometric characteristics of major salivary glands as a base line to develop a formula for the quantitative estimation of posttraumatic regeneration of glandular tissue

In experiments conducted on 903 rats, we have studied biometric characteristics of the major salivary glands (parotid, submandibular, and sublingual glands) during ontogenesis. We have calculated the indices of non-directional fluctuation asymmetry for the submandibular and sublingual glands and determined correlation coefficients and coefficients of linear regression between salivary glands, rat body weight, and the weight of the femoral bone (the largest bone in the rat). The strongest correlation was found between the dry weight of the submandibular gland and the rat body weight. Mathematical analysis of the growth of the submandibular gland after sialotomy allowed us to derive a formula for the quantitative estimation of regeneration, taking into account the natural growth of the rat.