Corrosione e protezione del composito Al 6061 T6/Al2O3p in ambiente marino

I compositi a base di alluminio sono materiali tecnologicamente avanzati con elevate proprietà fisicomeccaniche e sono considerati un’alternativa alle sue leghe tradizionali per l’utilizzo in campo marino.Lo scopo di questo lavoro è stato quello di studiare l’influenza di alcuni parametri caratteristicidel composito Al 6061 T6/Al2O3p sul comportamento alla corrosione marina e testare il potere protettivoe antifouling di alcuni rivestimenti organici di nuova generazione, per un impiego in campo navale.I dati ottenuti per il materiale non protetto dai diversi tests, in accordo fra loro, hanno evidenziatoun attacco corrosivo inferiore quando il contenuto di particelle di allumina aumenta e quandoil composito è ottenuto mediante processo di estrusione. In prossimità della fase rinforzante, inoltre,non sono stati evidenziati inneschi di corrosione localizzata, altrimenti presenti nella matrice.Le prove effettuate con coatings a bassa energia di superficie hanno mostrato un marcato effettoanticorrosivo e antivegetativo, in particolare per i rivestimenti siliconici, in grado di incrementaree mantenere le performances del substrato

Laparoscopic right hemicolectomy: the SICE (Societ\ue0 Italiana di Chirurgia Endoscopica e Nuove Tecnologie) network prospective trial on 1225 cases comparing intra corporeal versus extra corporeal ileo-colic side-to-side anastomosis

Background: While laparoscopic approach for right hemicolectomy (LRH) is considered appropriate for the surgical treatment of both malignant and benign diseases of right colon, there is still debate about how to perform the ileo-colic anastomosis. The ColonDxItalianGroup (CoDIG) was designed as a cohort, observational, prospective, multi-center national study with the aims of evaluating the surgeons\u2019 attitude regarding the intracorporeal (ICA) or extra-corporeal (ECA) anastomotic technique and the related surgical outcomes. Methods: One hundred and twenty-five Surgical Units experienced in colorectal and advanced laparoscopic surgery were invited and 85 of them joined the study. Each center was asked not to change its surgical habits. Data about demographic characteristics, surgical technique and postoperative outcomes were collected through the official SICE website database. One thousand two hundred and twenty-five patients were enrolled between March 2018 and September 2018. Results: ICA was performed in 70.4% of cases, ECA in 29.6%. Isoperistaltic anastomosis was completed in 85.6%, stapled in 87.9%. Hand-sewn enterotomy closure was adopted in 86%. Postoperative complications were reported in 35.4% for ICA and 50.7% for ECA; no significant difference was found according to patients\u2019 characteristics and technologies used. Median hospital stay was significantly shorter for ICA (7.3 vs. 9 POD). Postoperative pain in patients not prescribed opioids was significantly lower in ICA group. Conclusions: In our survey, a side-to-side isoperistaltic stapled ICA with hand-sewn enterotomy closure is the most frequently adopted technique to perform ileo-colic anastomosis after any indications for elective LRH. According to literature, our study confirmed better short-term outcomes for ICA, with reduction of hospital stay and postoperative pain. Trial registration: Clinical trial (Identifier: NCT03934151)

Coastal water monitoring and plankton biotic communities in the Genova Gulf (Ligurian Sea).

Several measures concerning temperature, salinity, pH, dissolved oxygen and nutrients, as well as bacterial, phytoplankton and zooplankton population dynamics were carried out during the spring-summer 1989 in the sea zone in front of Genova. The pertinent results are discussed

The biotic plankton community and eutrophication in coastal regions of the Gulf of Genoa.

Information of the results of the sampling carried out from May to September 1989 for the study of the biotic plankton community at three fixed stations in the Gulf of Genoa, locations affected by discharges from urban purification plant and rain water, are shown. The zooplankton sampling was performed using a standard net (WP2, mesh size 200 um), the phytoplankton and nutrient samples were taken with reversing water bottles and the bacteria sampled with a sterile bottle fitted with a closing mechanism. The catches were supported by hydrological data (Temperature, salinity, dissolved oxygen, pH) obtained using a multiparameter probe. The plankton community was studied both for quantity and quality, determining the most representative group of the zooplankton and the phytoplankton. The phytoplankton biomass was evaluated by measuring chlorophyll \u201ca\u201d while the total bacteria count was performed using the marine agar on plate count method. Bacteria resistant to mercury and chrome were investigated, as an indirect indication of pollution from these heavy metals, with negative result. Self-purifying test were performed on samples of water from the three sample stations, these tests have produced dispersion times for 90% of total Escherichia coli load from 6.9 to 20.9 hours

Study of planktonic populations in relation to the eutrophication state of the water in a Ligurian Sea zone.

This study examines the water characteristics of a neritic zone in front of Genova (Ligurian Sea). The samplings were carried out during the spring-summer 1989, 1990 and 1991 in two fixed stations (sea-bed 20m and 100-700m respectively). Some physico-chemical parameters, total bacteria, total and fecal coliforms and phyto- and zooplanktonic biotic communities were considered. On the whole, all recorded values show a generalized oligotrophic state of the water; nevertheless, sometimes an increasing trend of some parameters in the coastal station, probably due to anthropogenic causes, was pointed out. Classification and ordination techniques were applied to define temporal and structural changes of the community

Patients with Crohn's disease have longer post-operative in-hospital stay than patients with colon cancer but no difference in complications' rate

BACKGROUNDRight hemicolectomy or ileocecal resection are used to treat benign conditions like Crohn's disease (CD) and malignant ones like colon cancer (CC).AIMTo investigate differences in pre- and peri-operative factors and their impact on post-operative outcome in patients with CC and CD.METHODSThis is a sub-group analysis of the European Society of Coloproctology's prospective, multi-centre snapshot audit. Adult patients with CC and CD undergoing right hemicolectomy or ileocecal resection were included. Primary outcome measure was 30-d post-operative complications. Secondary outcome measures were post-operative length of stay (LOS) at and readmission.RESULTSThree hundred and seventy-five patients with CD and 2,515 patients with CC were included. Patients with CD were younger (median = 37 years for CD and 71 years for CC (P < 0.01), had lower American Society of Anesthesiology score (ASA) grade (P < 0.01) and less comorbidity (P < 0.01), but were more likely to be current smokers (P < 0.01). Patients with CD were more frequently operated on by colorectal surgeons (P < 0.01) and frequently underwent ileocecal resection (P < 0.01) with higher rate of de-functioning/primary stoma construction (P < 0.01). Thirty-day post-operative mortality occurred exclusively in the CC group (66/2515, 2.3%). In multivariate analyses, the risk of post-operative complications was similar in the two groups (OR 0.80, 95%CI: 0.54-1.17; P = 0.25). Patients with CD had a significantly longer LOS (Geometric mean 0.87, 95%CI: 0.79-0.95; P < 0.01). There was no difference in re-admission rates. The audit did not collect data on post-operative enhanced recovery protocols that are implemented in the different participating centers.CONCLUSIONPatients with CD were younger, with lower ASA grade, less comorbidity, operated on by experienced surgeons and underwent less radical resection but had a longer LOS than patients with CC although complication's rate was not different between the two groups