51 research outputs found

    Towards a channel evolution model for alluvial rivers in Italy

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    Recent studies carried out in twelve rivers have allowed to re-examine existing conceptual models of channel evolution for Italian rivers. The presence of three main phases of channel evolution is confirmed for some river reaches, while in other reaches the third phase (generally occurring over the last 15-20 years) is still unclear since river channels could be already in a quasi-equilibrium condition. Besides, while the first phases of adjustment were caused mainly by alterations of sediment regime, the very recent channel evolution appears to be strongly controlled also by flood magnitude and frequency

    Extracorporeal shockwave therapy on muscle tissue: the effects on healthy athletes

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    The aim of this study is to investigate the effects of extracorporeal shock wave therapy (ESWT) on muscle rheological and functional properties in a population of young athletes. Thirty-two football and basketball players were recruited and randomized into two groups. The athletes underwent three sessions of therapy administered every five days to the thigh muscles. The treatment consisted of ESWT (electromagnetic generator, Energy Flux Density=0.03 mJ/mm2) or a placebo treatment bilaterally on the quadricep and femoral bicep muscles. Monitoring was carried out at recruitment (T0), at the end of treatment (15 days, T1) and at 30 days (T2) with myometric evaluation (measuring elasticity, stiffness and muscular tone) and electromiography exam (recording the Motor Unit Amplitude Potential values). The results showed a significant increase in the treated athletes in the elasticity (lateral vastus muscle, p=0.007), in muscular tone (femoral rectus, p=0.031) and in muscular recruitment (the lateral vastus, p<0.005; medial vastus muscle, p=0.055). These results could represent a translational interpretation of the known biological effect on connective tissue: an increase in blood flow, oxygenation, metabolic process activation and proliferative effect. The effects found may represent the justification for verifying the usefulness of using of shockwave therapy to reduce muscular fatigue and improve performance during the sport season

    Phase I dose escalation study of gemcitabine and paclitaxel plus colony-stimulating factors in previously treated patients with advanced breast and ovarian cancer

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    8 citazioni su Scopus. http://www.scopus.com/record/display.url?eid=2-s2.0-0033832392&origin=resultslist&sort=plf-f&src=s&sid=1BklTwBDkRxWaxt9FLi7YAz%3a70&sot=aut&sdt=a&sl=37&s=AU-ID%28%22Benassai%2c+Giacomo%22+6602920646%29&relpos=6&relpos=6&searchTerm=AU-ID(\"Benassai, Giacomo\" 6602920646)- 10 citazioni su Google Scholar. Gemcitabine and paclitaxel (PTX) are among the most active new drugs in advanced breast and ovarian cancer. In this Phase I study, we used fixed doses of gemcitabine administered on days 1 and 8 and escalating doses of paclitaxel on day 1 of a 21-day cycle in patients with pretreated metastatic breast or ovarian cancer. The dose of gemcitabine was fixed at 1000 mg/m(2) PTX was commenced in the first small patient group at a dose of 90 mg/m2, which was then escalated in subsequent groups by 30 mg/m(2) per step. From the third dose level onwards, all patients received granulocyte colony-stimulating factor 300 mu g by subcutaneous injection on days 5 and 6, and granulocyte macrophage colony-stimulating factor on days 15-18. Cohorts of at least 3 patients were treated at each dose level. Dose escalation was stopped if at least a third of the patients in a given cohort had dose-limiting toxicity (DLT), which was defined as grade 4 neutropenia or thrombocytopenia, or grade 3-4 non-haematological toxicity. The maximum tolerated dose (MTD) was defined as the dose level immediately below that causing DLT in one-third of the patients or more. Evaluation of the tumour response was performed every three cycles. Forty-five patients (31 with breast cancer, 14 with ovarian cancer) were treated at seven different dose levels. Only at the seventh PTX dose level was DLT observed after the first course of therapy: three grade 4 neutropenia, one grade 4 thrombocytopenia, and one grade 4 anaemia. DLT occurred in 5/6 patients at at PTX dose of 270 mg/ m(2) therefore dose escalation was stopped at that level and the dose immediately before it (PTX 240 mg/m(2)) was considered as the MTD and recommended for further studies. No toxic deaths occurred. Grade 3-4 uncomplicated neutropenia was observed in four patients. Three had uncomplicated grade 3-4 thrombocytopenia. One patient had grade 3 and one grade 4 anaemia. Nonhaematological side effects were generally mild. Among 30 evaluable patients with metastatic breast cancer, four complete responses (CR) (13%) and 12 partial responses (PR) (40%) were observed, for an overall response rate of 53% (95% confidence interval (CI) 34-72). The median duration of response was 31 weeks. Among 13 evaluable patients with advanced ovarian cancer, one CR (8%) and five PRs (38%) were observed, for an overall response rate of 46% (95% CI 19-78). The median duration of response was 32 weeks. Our study shows that gemcitabine and PTX can be administered in combination in patients with breast and ovarian cancer without unexpected toxicities and with encouraging therapeutic results

    Axisymmetric polydimethysiloxane microchannels for in vitro hemodynamic studies

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    The current microdevices used for biomedical research are often manufactured using microelectromechanical systems (MEMS) technology. Although it is possible to fabricate precise and reproducible rectangular microchannels using soft lithography techniques, this kind of geometry may not reflect the actual physiology of the microcirculation. Here, we present a simple method to fabricate circular polydimethysiloxane (PDMS) microchannels aiming to mimic an in vivo microvascular environment and suitable for state-of-the-art microscale flow visualization techniques, such as confocal µPIV/PTV. By using a confocal µPTV system individual red blood cells (RBCs) were successfully tracked trough a 75 µm circular PDMS microchannel. The results show that RBC lateral dispersion increases with the volume fraction of RBCs in the solution, i.e. with the hematocrit
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