A Ewing-sarcomás betegek tünetmentes túlélési esélyeinek értékelése a Gyermekonkológiai Szekció eredményei alapján

Correlation between different prognostic factors and the overall survival of Ewing's sarcoma patients has been investigted. In this study data have been selected from the databank of Hungarian Pediatric Oncologist Section (1988-1999) (n=65). Whenever it was possible statistical analysis has been performed. Results: In our patients time interval from the primary symptoms to the diagnosis was 2-16 months. The average event-free survival in patients suffering from Ewing's sarcoma without metastasis is 0.39. Meanwhile, this value in patients with pulmonary or other metatasis is 0.24 (Kaplan-Meier analysis). Conclusion: Our results show a moderate difference between the Hungarian and the international event-free survival. Late detection is one of the answers of this discrepancy

One sixth of Amazonian tree diversity is dependent on river floodplains

Amazonia's floodplain system is the largest and most biodiverse on Earth. Although forests are crucial to the ecological integrity of floodplains, our understanding of their species composition and how this may differ from surrounding forest types is still far too limited, particularly as changing inundation regimes begin to reshape floodplain tree communities and the critical ecosystem functions they underpin. Here we address this gap by taking a spatially explicit look at Amazonia-wide patterns of tree-species turnover and ecological specialization of the region's floodplain forests. We show that the majority of Amazonian tree species can inhabit floodplains, and about a sixth of Amazonian tree diversity is ecologically specialized on floodplains. The degree of specialization in floodplain communities is driven by regional flood patterns, with the most compositionally differentiated floodplain forests located centrally within the fluvial network and contingent on the most extraordinary flood magnitudes regionally. Our results provide a spatially explicit view of ecological specialization of floodplain forest communities and expose the need for whole-basin hydrological integrity to protect the Amazon's tree diversity and its function.Naturali

(1→6)- and (1→3)(1→6)-β-glucans from Lasiodiplodia theobromae MMBJ: structural characterization and pro-inflammatory activity

The chemical composition and structural characterization of exopolysaccharides from the fungus Lasiodiplodia theobromae MMBJ are described, and the immunomodulatory activity of a purified β-glucan was evaluated. L. theobromae MMBJ produced three different β-glucans. One, fraction PEPS, was a branched (1→3)(1→6)-β-glucan and was insoluble in cold water. The other two, fractions SEPS-005R and SEPS-10E, were characterized as linear (1→6)-β-glucans with molar mass of 1.8×10(6)Da and 7.0×10(3)Da, respectively. From a total of 2.2g/L of EPS produced by L. theobromae through submerged fermentation, 1.5g/L (67%) was of the branched (1→3)(1→6)-β-glucan, while 25% (w/w) were linear (1→6)-β-glucans. Tests conducted with macrophages showed that the high molar mass (1→6)-β-glucan fraction (SEPS-005R) induced a pro-inflammatory response pattern.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq