丝光沸石催化剂上正己烷异构化反应机理

以轻质烷烃异构化中试放大用的丝光沸石催化剂为研究对象,运用“原位”红外反应技术和催化剂活性评价手段,并结合反应动力学参数计算,探讨了正已烷异构化反应机理。结果表明,可用五配位反应中间物种机理解释正碳离子的生成。用双分子六元环反应中间物机理能较好地解释正已烷在氢型丝光沸石(HM)上的异构化过程。对正已烷在Pd/HM上的反应过程也可用正碳离子机理结合双分子六元环中间物机理解释。     

123例清开灵注射液不良反应分析

对123个清开灵注射液所致不良反应病例进行分析,结果显示,使用该药时不良反应的出现与患者的性别、年龄以及使用剂量（在注明使用范围内）无关。在不良反应出现时间上,有53.7%病人在滴注期间1h内发生,有36.5%病人在用药24h后出现（均为再次或反复用药）。在类型上,41例皮肤反应（占33.3%）,26例药物热（占21.1%）,19例血液系统不良反应（占15.4%）,16例过敏性休克（占13%）,15例呼吸系统不良反应（占12.2）,3例惊厥（占2.4%）,其它3例（占2.4%）。不良反应出现的时间越早其危害性较大。浅析了不良反应发生的机理及防治方法。     

多孔结构聚合物乳胶粒

介绍了多孔结构乳胶粒的制备方法、表征手段以及成孔机理。着重阐述了“碱酸分段处理法”中不饱和酸与交联剂的种类与用量、以及碱酸处理条件等因素对乳胶粒成孔的影响。     

甲基酚烯酸酯树脂的热裂解机理

研究了以甲基丙烯酸酯端基不饱和取酯树脂为主链,用甲基丙烯酸甲酯取代苯乙烯作为交联剂制成的甲基丙烯酸酯树脂（ＭＡＥＲ）与通用型不饱和聚酯树脂（ＧＵＰＲ）的热裂解机理、燃烧现象。结果表明：ＭＡＥＲ的裂角产物中苯环化合物含量（１４．９％）少于ＧＵＰＲ（７４．５％）。ＭＡＥＲ燃烧时的发烟量和毒性也远低于ＧＵＰＲ。在ＭＡＥＲ中加入三水合氧化铝（ＡＴＨ）后,裂解产物中有毒物质的各类和数量更少,在燃烧时只有少量     

《内经》非药物疗法的防病治病机理初探

非药物疗法是中医治疗学中的一个重要组成部分.<内经>中的非药物疗法,通过协调阴阳平衡、调和气血运行、调节神志活动、调整脏腑功能等作用,对防病治病、养生益寿有重要意义.     

The cellular and molecular mechanism of laminin-glycopeptides on anti-metastasis

Ｌａｍｉｎｉｎ(ＬＮ)ｉｓａｍａｊｏｒｎｏｎｃｏｌｌａｇｅｎｏｕｓｇｌｙｃｏｐｒｏｔｅｉｎｉｎｂａｓｅｍｅｎｔｍｅｍｂｒａｎｅｓＩｔｈａｓｂｅｅｎｒｅｐｏｒｔｅｄｔｈａｔＬＮｃｏｕｌｄａｆｆｅｃｔａｎｕｍｂｅｒｏｆｂｉｏｌｏｇｉｃｂｅｈａｖｉｏｒｓｏｆｃａｒｃｉｎｏｍａｃｅｌｌｓｍｅｄｉａｔｅｄｂｙｔｈｅＬＮｒｅｃｅｐｔｏｒｓ1　ＩｔｉｓｋｎｏｗｎｔｈａｔｔｈｅＮｌｉｎｋｅｄｃｏｍｐｌｅｘｔｙｐｅｃａｒｂｏｈｙｄｒａｔｅｃｈａｉｎｓｏｎＬＮａｒｅｉｎｖｏｌｖｅｄｉｎｔｈｅｒｅｃｏｇｎｉｔｉｏｎａｎ…     

83例住院患者念珠菌感染的菌株鉴定及药敏分析

目的 :探讨住院患者念珠菌感染的种类及耐药现状。方法 :用法国生物 -梅里埃公司酵母菌鉴定系统和药敏试纸条进行菌株鉴定和药敏试验。结果 :白色念珠菌检出率最高 (5 0 .6 0 % ) ,热带念珠菌次之 (2 6 .5 1% ) ,高里氏念珠菌、近平滑念珠菌、分别为 9.6 4%和 7.2 3% ,其它念珠菌均在 5 .0 %以下。 6种抗真菌药中 ,5 -氟胞嘧啶、两性霉素B、制霉菌素的耐药率最低 (1.2 0 % ) ,唑类抗真菌的耐药率最高 (8.43～ 18.0 7% )。结论 :结果提示临床医师治疗真菌感染时应先进行培养和药敏试验 ,以便合理治疗 ,预防医院内感染。     

基于卷积神经网络和Transformer的肝脏CT图像分割方法

针对现有的卷积神经网络在肝脏图像分割上精度较低的问题,提出了一种以U-Net网络模型为基础的分割算法。将多头自注意力机制引入到U-Net网络的跳跃连接中,在编码器部分使用空洞卷积,采用混合损失函数从而提高分割精度。在LITS数据集上通过实验结果表明,利用本文方法进行肝脏分割与传统U-Net方法相比Dice系数提升3.3%,平均交并比提升了2.4%,平均像素准确率提升了3.66%。     

The effect of accident mechanisms and initial findings on the long-term course of whiplash injury

The aim of this study was to assess the relationships between accident mechanisms as well as initial findings and the long-term course of whiplash injury. A representative sample of 117 consecutive patients referred by primary care physicians was followed-up over 12 months. Fractures or dislocations of the cervical spine, head trauma and pre-existing neurological disorders were exclusion criteria. The interval between the accident and the baseline examination was 7.4 days (SD 4.2 days). Assessment included accident features (e.g. passenger position in the car, head restraint, head position, type of collision), initial symptoms (e.g. intensity and onset of pain, symptoms of neurological dysfunction, multiple symptom score), and signs (restricted neck movement, neurological deficits). At the 1-year examination, patients were divided into an asymptomatic and a symptomatic group and were compared with respect to accident features and baseline findings. Twenty-four percent of patients were still symptomatic after 1 year. Analysing accident mechanisms separately, rotated or inclined head position was the primary feature related to symptom persistence (P=0.005). The symptomatic group scored higher at baseline on the multiple symptom rating (P=0.004) and had a higher incidence of initial headache (P=0.004) and neurological symptoms (P=0.008) together with a higher intensity of headache (P=0.0002) and neck pain (P=0.0009). The following set of initial variables predicted persistence of symptoms at 1 year (logistic regression): intensity of neck pain (P=0.001) and headache (P=0.009), rotated or inclined head position (P=0.02), unpreparedness at the time of impact (P=0.01) and car stationary when hit (P=0.01). In conclusion, accident mechanisms and initial findings suggestive of more severe injury were significantly related to long-term persistence of symptoms after whiplash injury.This study was supported by the Swiss National Science Foundation (project number: 3.883-0.88) and the Swiss Accident Insurance Company (Schweizerische Unfallversicherungsanstalt), Berne     

Compression or distraction of the anterior cruciate injured knee

100 consecutive patients with a recent anterior cruciate ligament injury were examined with respect to type of sports activity that caused the injury, mechanism of injury and the occurrence of collateral ligament and meniscal lesions. There were 53 medial collateral ligament injuries, 12 medial, 35 lateral and 11 bicompartmental meniscal lesions. 59 patients were injured during contact sports, 30 in downhill skiing and 11 in other recreational activities, traffic accidents or at work. An associated medial collateral, ligament tear was more common in skiing (22/30) than during contact sports (23/59), whereas a bicompartmental meniscal lesion was found more frequently in contact sports (9/59) than in skiing (0/30). Weightbearing was reported by 56/59 of the patients with contact sports injuries and by 8/30 of those with skiing injuries. Non-weightbearing in the injury situation led to the same rate of MCL tears (18/28) as those reporting weightbearing (35/72) but significantly more intact menisci (19/28 vs 23/72). Thus, contact sports injuries were more often sustained during weightbearing, with a resultant joint compression of both femuro-tibial compartments as shown by the higher incidence of bicompartmental meniscal lesions. This might be an important prognostic factor for future joint disease and arthrosis. The classic unhappy triad was a rare finding (8/100) and we suggest that this entity should be replaced by the unhappy compression injury.