Investigation on poly[(methylsilylene ethynylene phenylene ethynylene)-co-(tetramethyldisiloxane ethynylene phenylene ethynylene)]

Poly[(methylsilylene ethynylene phenylene ethynylene)-co-(tetramethyldisiloxane ethynylene phenylene ethynylene)]was synthesized by polycondensation reaction of m-diethynylbenzene magnesium reagent with 1,3-dichlorotetramethyldisiloxane and dichloromethylsilane.The copolymer was characterized by FT-IR,~1H NMR,differential scanning calorimetry and thermogravimetric analysis.The results show that the copolymer exhibits good processability and cures at low temperatures.The cured copolymer shows high thermal stability.

Preparation of PdCo Bimetallic Hollow Nanospheres and its Electrocatalytic Activity for Oxidation of Formic Acid

The PdCo bimetallic hollow nanospheres with 80 nm average diameter and around 9.0 nm thickness of the shell were prepared with a special reduction method and characterized with transmission electron microscopy （TEM）, X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS）. The electrochemical measurements illustrated that the electrocatalytic activity of the PdCo bimetallic hollow nanospheres for the oxidation of formic acid is much higher than that of the Pd solid nanospheres.

基于钡条传输试验的腹腔镜选择性结肠切除与腹腔镜次全结肠切除治疗成人慢传输型便秘的比较

背景:外科手术是缓解成人慢传输便秘(ASTC)顽固性症状的有效治疗手段。本研究旨在评估,与次全结肠切除术相比,基于钡条传输试验的选择性结肠切除术能否提高ASTC的手术疗效。方法:采用回顾性队列研究,研究对象为2008年6月至2014年6月间收治的53例顽固性ASTC患者。术前行钡条传输试验、结肠镜检查、排粪造影和肛门测压。将行腹腔镜次全结肠切除手术的患者归为常规手术组,将基于钡条传输试验精准定位病变从而行腹腔镜选择性结肠切除术的患者归入LSC组。分别于术后3、6、12和24个月,记录患者自主排便次数、Wexner便秘评分和胃肠生活质量评分(GIQLI)。结果:49例患者纳入研究,其中常规手术组24例,LSC组25例。中位随访时间37个月(26-60个月)。平均术后住院时间12天,两组间差异无统计学意义(P=0.071)。LSC组结肠切除长度、手术时间和术中出血量均显著缩短(均P<0.05)。术后未出现严重并发症。两组患者中结肠壁肌层神经节细胞减少或缺乏的患者比例相当(P=0.986)。尽管术后自主排便次数和Wexner便秘评分两组患者的差异均无统计学意义,但LSC组患者术后3、6和24个月时GIQLI均显著高于常规手术组(均P<0.05)。结论:基于钡条传输试验的LSC是ASTC一种有效的治疗模式。