检索结果-南通市图书馆

Can we talk about “futile surgery” for the upfront treatment of the perihilar cholangiocarcinoma?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2024年第4期13卷 672-674页

作者： Maria Conticchio David Fuks Stylianos tzedakis Unit of Hepatobiliairy and Pancreatic Surgery Ente Ecclesiastico F.MiulliAcquaviva delle FontiBariItaly Unit of Hepatobiliary Digestive and Endocrine SurgeryCochin HospitalUniversitéParis CitéParisFrance

In this work(1),Ratti et *** to identify a subgroup of patients with perihilar cholangiocarcinoma(PHC)for whom the benefit of surgery could be compromised by morbidity,mortality and the risk of early tumor *** for this study come from a multi-institutional database that includes consecutive patients undergoing elective surgery for PHC in 27 Western centers(with experience of more than 15 major liver resections per year)starting in January *** from 2,271 patients were analyzed *** there is neither international consensus on preoperative management nor standardization of surgical technique,the indications for resection were validated at a local multidisciplinary consultation *** optimization was standardized with endoscopic or percutaneous biliary drainage to treat jaundice and the performance of portal embolization was proposed in the event of insufficient volume of the future remaining liver.

关键词： Perihilar cholangiocarcinoma(PHC) upfront surgery predictive risk score

Determination of Lead in Water by Linear Sweep Anodic Stripping Voltammetry (LSASV) at Unmodified Carbon Paste Electrode: Optimization of Operating Parameters

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2018年第3期9卷 171-186页

作者： Ndoye Mouhamed Kane Cheikhou Gadji Elhadji Momar Rokhy Diédhiou Moussa Bagha Mar-Diop Codou Guèye theo tzedakis Ecole Supérieure Polytechnique Université Cheikh Anta Diop Dakar Senegal Laboratoire de Génie Chimique UMR CNRS 5503 Université de Toulouse III-Paul Sabatier Toulouse France

This study presents the elaboration of a simple and cheap electrode made by carbon paste introduced into a cavity of electrode body, and used for the lead traces determination in tap water. A potentiostatic pre-electrolysis at constant voltage enables the reduction of the lead (Pb2+) and the accumulation of the metallic lead at and into the carbon paste;the reoxidation of the Pb (Linear sweep voltammetry) leads to the anodic striping peak. The effect of the main operating parameters on the shape of the peak and the magnitude of the current was examined and their optimal values were determined. Then calibration was achieved and the method was successfully applied (using all the optimized parameters) to the determination of lead in water, with a detection limit of 0.138 μg·L-1. Compared to other methods (ICP-AES for example), the proposed method offers a satisfactory detection limit of the Pb2+ (0.138 μg·L-1) because of the important specific area of the carbon paste electrode, for a significantly lower cost. Besides, there is no observed loss in the electrode answer in terms of peak current, which means that there is no any irreversible steps nor deactivation of the electrode, even after ten successive measurements;only reduction of the lead followed by the deposit oxidation was observed at the electrode.

关键词： Carbon Paste Electrode Lead Linear Sweep Anodic Stripping Voltammetry Water

Early cholecystectomy cannot be regarded as a mortality risk factor in moderate and severe acute biliary pancreatitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2024年第1期13卷 109-111页

作者： Bader Al Taweel Stylianos tzedakis Fabrizio Panaro Digestive Surgery and Transplantation Montpellier University HospitalUniversity of MontpellierMontpellierFrance Chirurgie Digestive APHP Paris ParisFrance

We read with great interest the article by Di Martino et al.(1)on the timing of cholecystectomy after moderately severe and severe acute biliary pancreatitis(ABP).In this retrospective study,the authors analyzed data from the MANCTRA-1 *** 5,304 patients,3,696 met the inclusion criteria(cholecystectomy performed and stage of pancreatitis known)and were included in the *** aim of this study was to assess the impact of early cholecystectomy(EC)on morbidity and mortality in ABP,particularly in moderately severe and severe forms according to the modified Atlanta classification(2).EC was defined as removal of the gallbladder within 14 days of admission,and was compared with delayed cholecystectomy(DC).

关键词： Cholecystectomy severe pancreatitis morbidity mortality

Synthesis of Antimalarial Bicyclic Hemiketal Peroxides Belonging to the G-factor Family

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Life Sciences 2010年第1期4卷 38-42页

作者： Christiane Andre-Barres Fadia Najjar Virginie Bernat Michel Baltas Corinne Dufaure Beatrice Tuccio Robert Lauricella theo tzedakis Marck Workentin Henri Vial LSPCMIB UMR CNRS 5068 Universit~ Paul-Sabatier 118 route de Narbonne F-31062 Toulouse cedex 04 France CIRIMAT CNRS UMR 5085 ENSIACET 118 route de Narbonne 31077 Toulouse cedex 04 France LCP-SACS Universitd Aix-Marseille-CNRS UMR 6264 Campus St. Jdrome Case 512 13397 Marseille cedex 20 France LGC CNRS UMR 5503 Universitd Paul-Sabatier 118 route de Narbonne 31062 Toulouse France Department of Chemistry the University of Western Ontario London ON Canada N6A 5B7 Canada UMR CNRS 5539 Universitd Montpellier 2 cc107 Place E. Bataillon F-34095 Montpellier cedex 5 France

Structural analogues of bicyclic peroxides belonging to the G factors family have been synthesised under Mannieh type conditions, followed by an autoxidation step furnishing exclusively the peroxide. As electron transfer from heine or free iron to peroxide is the first step in the mode of action ofartemisinin -like compound, Fe（fl） induced reduction was studied and the reactivity of the intermediate C-centered radical formed was correlated to the antimalarial activity. Dissociative electron transfer was studied by electrochemistry and allowed the evaluation of the standard reduction potentials and other pertinent thermochemical information. These bicyclic peroxides were evaluated in vitro against Plasmodium falciparum and revealed moderate to good activity.

关键词： Antimalarial synthesis peroxide C-centered radical.

Electrochemical Analysis of Zirconiumin Aqueous and Organic Media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2024年第2期15卷 99-118页

作者： Paul Mendy Démo Koita theodore tzedakis Cheikhou Kane Codou Guèye Mar-Diop Ecole Supérieure Polytechnique Université Cheikh Anta DIOP Dakar Sénégal Laboratoire de Génie Chimique Université de Toulouse III—Paul Sabatier Toulouse France

For the challenging nature of the zirconium environment analysis, this study consists to analyze the electrochemical behavior of Zirconium in both aqueous and organic media. To that end first the electrolytic media was selected on the basis of the Pourbaix potential-pH diagram, which provides informations on the predominance of Zr(IV) ion and Zr in aqueous media. In aqueous media, analyzes were first carried out in acidic media then in basic media. Studies have thus revealed that the acidic environment is not favourable for the electrochemical analysis of zirconium. Voltammograms obtained in an acidic environment show no zirconium detection signal;this is due to the strong presence of H+ ions in the solution. We have also observed in acidic media the phenomenon of passivation of the electrode surface. In aqueous alkaline media (pH = 13), we have drawn in reduction several Intensity-Potential curves by fixingsome technical parameterslike scanning speed, rotation speed of the electrode. The obtained voltammograms show cathodic waves, starting from -1.5 V/DHW and attributed to the reduction of Zr (IV) to Zr (0). The last phase of this study focused on the electrochemical analysis of zirconium in an organic media. In this media, several intensity-potential curves were plotted in reduction and in cyclic voltammetry with various parameters. Through several reduction analysis, the Zr (IV) was reduced to Zr (0) to the potential of -1.5 V/DHW. The electrochemical analysis of zirconium in organic media seems globally easier to achieve thanks to its large solvent window (i.e. dimethylformamide (DMF) solvent window > 6 V).

关键词： Zirconium Electrochemical Reduction Cyclic Voltammetry Voltammogram Dymethylformamide

Feasibility,safety and limits of robotic approach for lymphadenectomy in biliary tumours

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2023年第3期12卷 404-406页

作者： Julie Deyrat Stylianos tzedakis AP-HP Centre Universitéde ParisGroupe Hospitalier Cochin Port RoyalDMU Cancérologie et spécialités médico-chirurgicalesService de chirurgie hépatobiliairedigestive et endocrinienneParisFrance

We read with great interest the study of Ratti et al.(1)aiming to compare robotic,laparoscopic and open hepatectomies in terms of feasibility,safety and oncological adequacy in surgery for biliary tumours(intrahepatic cholangiocarcinoma,perihilar cholangiocarcinoma and gallbladder cancer).The authors conducted a retrospective monocentric study focusing on the quality of lymphadenectomy,operative time and postoperative morbidity and mortality up to day *** a weighted propensity score analysis by inverse probability of treatment weighting(IPTW),25 patients operated by robotic approach were compared with 97 patients operated by laparoscopy and 113 by laparotomy.

关键词： Robotic minimally invasive lymphadenectomy biliary tumour

A Japanese multi-institutional randomized controlled trial(ND-Trial)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2021年第2期10卷 226-228页

作者： Stylianos tzedakis David Fuks Department of Digestive PancreaticHepato-biliary and Endocrine SurgeryCochin HospitalAPHPParisFrance University of Paris ParisFrance

We read with great interest the recently(Annals of Surgery,Feb,2021)published article by Arita and collaborators(1)about the clinical impact of a no-drain policy in liver *** aforementioned study(ND-trial)is the first multi-institutional randomized controlled trial(RCT)assessing the impact of a drain placement after liver resection on the severe postoperative complication rate.

关键词： Surgery randomized clinical

Stability of highly supersaturated vanadium electrolyte solution and characterization of precipitated phases for vanadium redox flow battery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第10期30卷 436-445,I0012页

作者： Waldemir M.Carvalho Jr Laurent Cassayre Delphine Quaranta Fabien Chauvet Ranine El-Hage theodore tzedakis Béatrice Biscans Laboratoire de Génie Chimique Universitéde ToulouseCNRSINPUPSToulouseFrance

The vanadium redox flow battery(VRFB)has been receiving great attention in recent years as one of the most viable energy storage technologies for large-scale ***,higher concentrations of vanadium species are required in the H_(2)O-H_(2)SO_(4) electrolyte in order to improve the VRFB energy *** might lead to unwanted precipitation of vanadium compounds,whose nature has not been accurately characterized *** this purpose,this study reports the preparation ofⅤ^((Ⅱ)),ⅤV^((Ⅲ)),Ⅴ^((Ⅳ))andⅤ^((Ⅴ))supersaturated solutions in a 5 M H_(2)SO_(4)-H_(2)O electrolyte by an electrolytic method,from the only vanadium sulfate compound commercially available(VOSO_(4)).The precipitates obtained by ageing of the stirred solutions are representative of the solids that may form in a VRFB operated with such supersaturated *** solid phases are identified using thermogravimetric analysis,X-ray diffraction and *** report that dissolvedⅤ^((Ⅱ)),Ⅴ^((Ⅲ))andⅤ^((Ⅳ))species precipitate as crystals of VSO_(4),V_(2)(SO_(4))3 and VOSO_(4) hydrates and not in their anhydrous form;conversely V^((Ⅴ))precipitates as an amorphous V_(2) O_(5) oxide partially *** measured hydration degrees(respectively 1.5,9,3 and 0.26 mol of H_(2)O per mol of compound)might significantly affect the overall engineering of VRFB operating with high vanadium concentrations.

关键词： Vanadium Redox Flow Batteries Supersaturated electrolyte Precipitation Vanadium sulfate Vanadium hydrates

Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO<sub>3</sub>

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Analytical Sciences, Methods and Instrumentation 2017年第4期7卷 116-135页

作者： Brigitte Dustou Laure Latapie Fabien Chauvet Jean-Michel Bergerat theodore tzedakis LGC UMR CNRS 5503 Université de Toulouse III-Paul Sabatier Toulouse France Airbus Campus 2-Building B23-Module 04-Room 0411 1 Rond-Point Maurice Bellonte Blagnac France

The present study couples the acid/basis titration and the ICP analysis in order to monitor the concentrations of nitric and hydrofluoric acids, and presents into baths used to pickle alloys of titanium or stainless steel, largely employed in the aeronautic industry. The pickling of the alloys releases various metallic cations able to react with HF in order to lead to metal-fluoride complexes and free H+, the last being able to react with the basis. In this study, it was determined: the most significant correlations providing the number of the protons released by the complexation of the metallic cation by the fluoride. The proposed method based on: 1) these correlations;2) the titration pH = f(VKOH) curves;and 3) the content of metallic cations determined by ICP, enables the monitoring of the content of HNO3 and HF into the pickling bath. Assuming that one bath was used for one type of alloy (alloys of Titanium for example, or alloys of stainless steel), then the proposed method appears providing reliable concentration values of both acids as well as metallic cations.

关键词： Pickling Bath Monitoring Mix HF/HNO3 Titration Fluoride-Metallic Cations Complexation Titanium Alloys Pickling Stainless Steel Alloys Pickling