Spatial distribution and source apportionment of metals in sediments of Meriç-Ergene Basin, Turkey

The present study is aimed to detect and evaluate metal accumulation in the sediments of Meriç-Ergene Basin, which is an industry-intensive area in Turkey. Ten metals and Total Organic Carbon (TOC) concentrations were determined in sediment samples collected from forty-one different sampling points selected considering the pollutant source types and the flow direction from the upstream towards the downstream in July and December 2020 representing the dry and wet periods. Concentrations measured were evaluated in terms of pollution levels, relationship with each other and source distribution using risk indexes and various statistical techniques. According to the findings, TOC and metal concentrations in sediments taken from regions where industrial activities are concentrated were significantly higher. The values measured in these areas especially for chromium, copper and zinc were 8–11 times more of the reference regions. The index calculations showed that the pollution level at industry-intensive areas were enriched by cadmium, chromium, copper, lead, zinc and these particular regions had higher ecological risk than the agricultural areas and the reference site. Hierarchical Cluster Analysis (HCA) was performed to statistically categorize the sampling points and three common spatial distributions were obtained. Principal Component Analysis (PCA) was used to identify common sources of metals, and correspondingly, two common source groups were identified. Accordingly, there appeared a similar pattern and dense pollution in the sediments of the industrialized areas, and more than half of the metal load was found to be due to industrial activities and to the still active unsanitary landfills. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK: 119Y028This study was supported by TUBITAK (Scientific and Technological Research Council of Turkey) under Project No. 119Y028. We would like to thank TUBITAK for their support.This study was supported by TUBITAK (Scientific and Technological Research Council of Turkey) under Grant Project No. 119Y028. All of the sampling and laboratory analyzes within the scope of the study were carried out with the support provided by TUBİTAK

Analysis of thrombosis and bleeding complications in patients with polycythemia vera: a Turkish retrospective study

The aims of this study are to determine the incidence and risk factors of thrombosis and bleeding in polycythemia vera (PV) patients and to research the effects of these risk factors on survival. The medical records of 155 PV patients were analyzed retrospectively. Patients were divided into groups according to whether or not thrombosis had developed in follow-up, and according to whether or not bleeding had occurred during follow-up. The mean age at diagnosis was 53 years, and the mean follow-up period was 66 months. The percentage of cases in which thrombosis events had occurred before diagnosis and during follow-up were 26 and 28 %, respectively. Comparisons of disease duration and average thrombosis risk score between groups with or without thrombosis drew statistically significant results. A patient's history of thrombosis and thrombocytosis at first visit was found to have a significant effect on thrombosis recurrence. The major bleeding rate was 8 %. Post-PV myelofibrosis was an independent risk factor for bleeding. The major cause of death among the patients in this study was primary thrombosis. The most important causes of mortality among PV patients are thrombosis, and the most prominent risk factors for thrombosis development are disease duration and high thrombosis risk scores. Thrombocytosis in patients with a history of thrombosis may cause thrombosis recurrence during the follow-up period