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Purpose: In this study, we explored the safety of laparoscopic gastrectomy in obese gastric cancer patients compared with conventional open gastrectomy based on early surgical outcomes. Methods: A total of 462 patients who underwent curative gastrectomy for early gastric adenocarcinoma from January 2000 to December 2014 were enrolled. Two obesity cohorts were defined according to a body mass index (BMI) of ≥25 kg/m2 versus ≥30 kg/m2. Those cohorts were further divided into the laparoscopic distal gastrectomy (LDG) and open distal gastrectomy (ODG) groups, and clinicopathologic characteristics were compared with early surgical results. Results: There were no significant differences in clinicopathologic characteristics between the LDG and ODG groups in the BMI ≥25 or BMI ≥30 cohorts. For the overall complication rate, fewer complications were observed in the LDG than ODG group in both cohorts. Among the overall complications, significant differences were observed in the minor complication rates (Clavien-Dindo I or II), but no significant difference was observed in the rate of Clavien-Dindo III or higher complications. For risk factor analysis of postoperative complications, open distal gastrectomy, age >60 years, and BMI ≥30 were independent risk factors for postoperative morbidity among all obese patients. Conclusion: LDG may be a better procedure to improve surgical outcomes in patients with obesity undergoing surgery for early gastric cancer in terms of less excessive blood loss, shorter operation time, and lower complication rates.
Ultra-thin polymer films containing metal/metal complex, cobalt(II) meso-tetraphenylporphyrin(CoTPP), have been prepared by vacuum codeposition of metal/metal complex and organic monomer or macromolecular prepolymer onto the substrate and oxygen binding to the metal center of CoTPP has been studied. CoTPP is capable of binding oxygen reversibly and in a special circumstance binding oxygen irreversibly, which strongly depends on the dispersed metal phase state in the solid films. An oxygen molecule can be bound to the one metal center of CoTPP reversibly and shared with two metal centers of adjacent CoTPP molecules irreversibly. The results of oxygen uptake measurements has showed that 75% of metal complex molecules are capable of binding oxygen reversibly.
Ultra-thin polymer films containing metal/metal complex have been prepared by vacuum codeposition of metal/metal complex and organic monomer or macromolecelar prepolymer onto the substrate to achieve not only the individual dispersion of metal atoms/metal complex molecules in the polymer matrix but also to obtain ultra-thin polymer films. In the plasma polymerization cobalt powder/cobalt(Ⅱ) meso-tetraphenylporphyrin(CoTPP), which is capable of binding oxygen molecule, and trans-2-butene were used as comonomers to make metal/metal complex containing plasma polymer films. The metal loading of 50% was achieved and the resulting films had a strong capability of reversibly binding oxygen, which might indicate that the molecule-scale dispersion of chemically reactive metal complex was obtained in the highly crosslinked plasma polymer films.
Ultra-thin polymer films containing metal/metal complex have been prepared by vacuum codeposition of metal/metal complex and organic monomer or macromolecular prepolymer onto the substrate to achieve not only the individual dispersion of metal atoms/metal complex molecules in the polymer matrix but also to obtain ultra-thin polymer films. In the m-situ UV photopolymerization cobalt powder/cobalt(II) meso-tetraphenylporphyrin(CoTPP), which is capable of binding oxygen molecule, and poly(ethylene glycol) dimethacrylate/trimethylolpropane trimethacrylate/tripropylene glycol diacrylate/trimethylolpropane triacrylate were used as comonomers to obtain metal/metal complex containing UV-polymerized thin films. The resulting films had a strong capability of reversibly binding oxygen, which might indicate that the molecule-scale dispersion of chemically reactive metal complex was obtained in the highly crosslinked in-situ UV-polymerized thin films.
The effect of nonreactive commercially available elastomers, vinyl acetate based copolymer and aliphatic/aromatic based resin, on the UV photopolymerization kinetics of a methacrylate resin has been studied. As a reactive solvent N-vinyl-2-pyrrolidone(NVP) was used and then volatile-free homogeneous liquid blend was obtained. An increase in elastomers content caused a decrease in both photopolymerization rates and final conversions. In the latter stage of photopolymerization diffusion-controlled reaction should be considered due to incorporation of high MW polymers in the matrix.Visual transparancy was maintained with no evidence for phase separation for the time period of photopolymerization.
Interpentrating polymer networks(IPN) based on diglycidyl ether of bisphenol-A(DGEBA) and dimethacrylate prepolymer were blended and cured by using benzoyl peroxide(BPO) and 4,4-methylenedianiline(MDA) as initiating and curing agent, respectively. The morphology of the IPNs was observed by SEM and showed the micro-separated phase, in which 10-20 nm size in diameter of dimethacrylate islands uniformly dispersed. The size of the separated islands strongly depends on the molecular weight and the type of the dimethacrylate prepolymer. Mophologies of hard- and flexible-backboned urethane dimethacrylate and epoxy dimethacrylate prepolymer were compared in the present study.