Characterization and Performance Evaluation of Metakaolin-Based Geopolymer Foams Obtained by Adding Palm Olein as the Foam Stabilizer

Geopolymer foams with different pore structures can be used in construction, water treatment, and heavy metal adsorption. The preparation of high porosity geopolymer foams using vegetable oil as a foam stabilizer is a feasible and cost-effective route. In this study, metakaolin-based geopolymer foams with hierarchical pore structures were fabricated by adding H₂O₂ as the foaming agent with palm olein as the foam stabilizer. The effects of H₂O₂ and palm olein content on the chemical features and pore structure of geopolymer foams were evaluated. Water absorption, thermal conductivity, and mechanical behaviors of geopolymer foams were also investigated. The results indicate that fatty acid salt surfactants were generated in situ in the geopolymer matrix due to the addition of palm olein. Geopolymer foams with H₂O₂ and palm olein addition possess a homogeneously concentrated macropore distribution. Palm olein exhibits a refining effect on intrinsic pores formed by geopolymerization. In addition, using appropriate amounts of palm olein and H₂O₂, geopolymer foams can achieve higher open porosity and better pore connectivity, resulting in the improvement of water absorption and thermal insulation capacity.     

逆行髓内钉辅助在儿童股骨延长中的应用

目的:采用髓内钉辅助延长技术进行儿童股骨大段延长,评估其可行性,并对比同期矫正和分期手术的技术要点,明确此技术在儿童患儿中的应用价值。方法:自2014年7月7日至2018年1月16日共规划完成逆行髓内钉辅助延长手术10例,其中男9例,女1例;年龄（13.10±2.18）岁。所有患儿延长截骨点均位于股骨远端干骺端,初诊至...     

Rapid and Severe Idiopathic Aseptic Necrosis of the Contralateral Femoral Head after Unilateral Total Hip Arthroplasty

BackgroundOsteonecrosis of the femoral head (ONFH) is a multifactorial disease, and agnogenic ONFH, otherwise known as idiopathic ONFH, is rare in clinic. Idiopathic ONFH that exhibits severe necrosis and progresses extremely rapidly is called rapidly destructive hip disease (RDHD). RDHD greatly affects patients but is rarely reported in clinical practice and literature.Case PresentationIn this study, a 64‐year‐old male patient with complete collapse and necrosis of the right femoral head complicated with severe bone destruction at 10 months after left total hip arthroplasty (THA) was reported. The period from the intact structure of the right femoral head to the first discovery of its complete collapse, according to imaging results, was 7 months. The duration from the occurrence of symptoms in the right hip joint to the first discovery of complete collapse and necrosis of the femoral head was only 5 months. At present, the cause has not been determined based on medical history, symptoms, signs, imaging evaluation results, laboratory examination results, and pathological examination results, though it has been identified as severe idiopathic aseptic necrosis of the femoral head with rapid progression, or RDHD. Finally, right THA was performed, and a good outcome was observed in the patient at present.ConclusionsAs a rare hip joint disease, RDHD greatly influences the normal life of patients. RDHD of the contralateral side after unilateral THA is even scarcer. Left THA may be one of the important factors accelerating the necrosis of the right femoral head. Hopefully, with this case report, more attention will be paid to the contralateral hip joint in patients undergoing unilateral THA by clinicians and rehabilitation physicians, and a clinical reference will be provided for the research on RDHD.     

托毒益气养阴汤治疗肛周坏死性筋膜炎(毒盛正虚证)的临床研究

目的 观察托毒益气养阴汤治疗肛周坏死性筋膜炎(毒盛正虚证)的临床疗效.方法 将66例患者随机分为治疗组与对照组各33例,对照组采用西医常规治疗,治疗组在对照组基础上采用内服托毒益气养阴汤治疗.两组均治疗2周.结果 两组治疗后创面疼痛、病变范围、全身症状、坏死性筋膜炎实验室风险指数(LRINEC)评分及白细胞计数(WBC...     

高龄冠心病合并心房颤动患者行非体外循环冠状动脉旁路移植术中左心耳处理的回顾性队列研究

目的 本文旨在探讨左室射血分数(LVEF)降低的高龄冠心病合并心房颤动(房颤)患者在非体外循环冠状动脉旁路移植术(OPCABG)中同期处理左心耳的手术技巧及效果评价.方法 纳入2013～ 2018年,84例OPCABGLVEF降低(＜50％)的高龄(年龄≥70岁)冠心病合并房颤患者在我科行非体外循环冠脉搭桥术.男54例...     

应用siRNA敲低TPM3基因表达后对大鼠胰腺癌细胞侵袭转移能力的影响

目的：探究原肌球蛋白3（tropomyosin alpha-3 chain,TPM3）在大鼠胰腺癌细胞中对其侵袭转移能力的影响并初步阐述其可能的分子机制。方法：（1）将70只大鼠随机分为手术组40只[将7,12-二甲基苯并蒽（7,12-dimethyl-1,2-benzanthracene,DMBA]植入大鼠胰腺被膜下后荷包缝合被膜）,假手术组15只（只对胰腺进行荷包缝合而后关腹,不置入DMBA）,阴性对照组15只（不做任何处理）,建立大鼠胰腺癌模型。（2）通过组织免疫组化染色的方法对差异蛋白TPM3进行验证。（3）通过机械分离和酶阶段消化法分离胰腺癌组织的方法获取大鼠胰腺癌细胞,体外传代培养获得纯度较高的细胞后,应用siRNA敲低大鼠胰腺癌细胞中TPM3基因的表达;通过RT-PCR技术检测其沉默效果。（4）通过Transwell实验和平板克隆实验分别对细胞的侵袭、迁移能力及生长增殖能力进行观察。结果：（1）经病理验证模型组有37.83%（14/37）形成胰腺癌,证明大鼠胰腺癌模型建立成功。（2）免疫组化验证胰腺癌组织中TPM3阳性率（92.8%）明显高于正常胰腺组织（6.7%）。（3）RT-PCR结果显示,转染TPM3-siRNA的细胞中TPM3的表达量（0.31±0.02）明显低于其余各组,脂质体组（0.45±0.02）,阴性对照组（0.45±0.02）,空白对照组（0.43±0.02）（P＜0.05）,其余各组之间TPM3表达量差异无统计学意义（P ＞0.05）。（4）转染TPM3-siRNA的细胞其侵袭[（161.63±4.94）个]、迁移能力[（206.87±4.21）个]及生长增殖能力[（51.5±2.327）个]较对照组明显降低[分别为（39.7±1.40）个,（67.27±1.76）个,（5.900±0.767）个]（P＜0.05）。结论：体外化学合成的TPM3-siRNA可有效的抑制大鼠胰腺细胞TPM3的表达,TPM3表达降低后其侵袭能力、迁移能力及生长增殖能力下降。     

腹腔镜胃癌根治术医源性损伤的原因分析

目的：分析腹腔镜胃癌根治术中医源性损伤发生的原因。方法：回顾2012年1月到2013年9月本医疗组完成的113例腹腔镜胃癌根治术手术视频,发现医源性损伤11例,并回顾分析相应的病例资料,对其发生原因进行总结分析。结果：11例医源性损伤中,结肠系膜损伤1例,脾脏损伤4例,血管损伤6例,包括肝固有动脉损伤1例,门静脉损伤1例,脾静脉损伤2例,胃短动脉损伤1例,脾上极血管损伤1例;上述医源性损伤均是由于解剖不清晰,术者之间相互配合不好所致。结论：术中解剖不清晰,术者间配合欠佳是腹腔镜胃癌根治术医源性损伤发生的主要原因。     

人肝再生增强因子真核表达及其对顺铂诱导肝癌细胞凋亡的影响

目的：构建人肝再生增强因子（human augmenter of liver regeneration,hALR）15kD亚型的真核表达系统,并探索ALR对顺铂（Cisplatin,DDP）诱导的人肝癌细胞株QGY凋亡的影响。方法：用聚合酶链反应（polymerase chain reaction,PCR）方法和基因重组技术,从重组质粒pPIC9K-rhALR中扩增出编码rhALR基因片段,将其克隆入pPICZαA质粒中构建重组质粒pPICZα－A-rhALR。重组质粒SacⅠ酶切线性化后电转入酵母GS115中,并在1%的甲醇诱导下表达。表达上清蛋白经Western blot（ALR多克隆抗体和His-tag标签抗体）鉴定和镍柱亲和层析纯化。MTS试剂检测rhALR体外对人肝癌细胞（HepG2、QGY）的促增殖活性,及流式细胞仪检测rhALR在顺铂诱导QGY细胞凋亡中的抗凋亡作用。结果：PCR、双酶切、DNA测序均鉴定重组质粒构建与预期一致。分泌表达的rhALR约占上清总蛋白的70%,目的分子量约17 kD,Western blot均可见单一条带。纯化后的rhALR对HepG2和QGY的体外促增殖作用呈浓度依赖性增强（HepG2组：F=246.729,P=0.000;QGY组：F=246.004,P=0.000）,且在QGY细胞顺铂诱导凋亡时也发挥着浓度梯度式抗凋亡作用（F=101.061,P=0.000）。结论：成功构建高效分泌表达rhALR的pPICZα－A-rhALR GS115真核表达系统;体外实验证实rhALR对顺铂诱导人肝癌细胞有呈浓度依赖性的抗凋亡作用。     

姜黄素联合FOLFOX方案对胃癌细胞株BGC-823的抑制和诱导凋亡的作用

目的:探讨姜黄素联合FOLFOX方案(奥沙利铂/氟尿嘧啶方案)对胃癌细胞株BGC-823的增殖和凋亡作用以及可能发生的机制。方法:以胃癌细胞株BGC-823 cell为研究对象,设置空白对照组、姜黄素组(10μmol/L)、FOLFOX组[5-FU(0.1mmol/L)+奥沙利铂(5 mmol/L)]和姜黄素联合FOLFOX组4组,采用CCK-8法测定细胞增殖抑制率,Hoechst染色观察细胞凋亡情况,real-time PCR和Western blot分别检测Bcl-2、Bax m RNA和蛋白表达变化,Caspase-3活性检测试剂盒测定Caspase-3活性。结果:1CCK8显示,与空白对照组比较,各用药组均抑制BGC-823细胞的增殖,姜黄素联合FOLFOX组的抑制作用最明显,差异均有统计学意义(P<0.05);2Hoechst染色结果显示,各用药组凋亡细胞明显多于空白对照组,姜黄素联合FOLFOX组凋亡细胞最明显;3real-time PCR和Western blot证实,与空白对照组比较,各用药组Bcl-2 m RNA、Bcl-2蛋白降低而Bax m RNA、Bax蛋白升高,姜黄素联合FOLFOX组变化更明显,差异均有统计学意义(P<0.05);4Caspase-3活性检测证实,各用药组Caspase-3活性均升高,姜黄素联合FOLFOX组最高,差异均有统计学意义(P<0.05)。结论:姜黄素联合FOLFOX能抑制胃癌细胞株BGC-823细胞增殖,诱导凋亡,机制可能与Bax激活/Bcl-2失活,活化Caspase-3信号通路有关。