高中生的生活事件、社会支持对自我概念的影响

目的 探讨高中生生活事件和社会支持对自我概念的影响.方法 对247名高中生进行自我概念量表、青少年生活事件量表、领悟生活支持量表测试.结果 ①高一学生的教师支持显著好于高二学生(t=2.09,P＜0.05),男同学的身体自我概念显著好于女同学(t=2.6,P＜0.01).②生活事件与自我概念显著负相关,社会支持与自我概念显著正相关.③学习压力负向预测自我概念,家庭支持和朋友支持正向预测自我概念,朋友支持在学习压力和自我概念的关系中起调节作用.结论 生活事件中的学习压力对自我概念有负面影响,家庭支持和朋友支持对自我概念有正面影响,朋友支持可以缓解学习压力对自我概念的负面影响.     

Chemosensitizing effect and mechanism of imperatorin on the anti-tumor activity of doxorubicin in tumor cells and transplantation tumor model

Multidrug resistance of tumors has been a severe obstacle to the success of cancer chemotherapy. The study wants to investigate the reversal effects of imperatorin (IMP) on doxorubicin (DOX) resistance in K562/DOX leukemia cells, A2780/Taxol cells and in NOD/SCID mice, to explore the possible molecular mechanisms. K562/DOX and A2780/Taxol cells were treated with various concentrations of DOX and Taol with or without different concentrations of IMP, respectively. K562/DOX xenograft model was used to assess anti-tumor effect of IMP combined with DOX. MTT assay, Rhodamine 123 efflux assay, RT-PCR, and Western blot analysis were determined in vivo and in vitro. Results showed that IMP significantly enhanced the cytotoxicity of DOX and Taxol toward corresponding resistance cells. In vivo results illustrated both the tumor volume and tumor weight were significantly decreased after 2-week treatment with IMP combined with DOX compared to the DOX alone group. Western blotting and RT-PCR analyses indicated that IMP downregulated the expression of P-gp in K562/DOX xenograft tumors in NOD/SCID mice. We also evaluated glycolysis and glutamine metabolism in K562/DOX cells by measuring glucose consumption and lactate production. The results revealed that IMP could significantly reduce the glucose consumption and lactate production of K562/DOX cells. Furthermore, IMP could also remarkably repress the glutamine consumption, α-KG and ATP production of K562/DOX cells. Thus, IMP may sensitize K562/DOX cells to DOX and enhance the anti-tumor effect of DOX in K562/DOX xenograft tumors in NOD/SCID mice. IMP may be an adjuvant therapy to mitigate the multidrug resistance in leukemia chemotherapy.     

SARS定点收治医院工作人员SARS冠状病毒感染的危险性调查

目的了解医院工作人员感染SARS病毒的危险性。方法对与SARS患者收治相关的工作人员进行问卷调查;用酶联免疫法检测SARS冠状病毒IgG抗体。结果发放调查问卷450份,收回问卷并采集血标本441人份。接受调查者全部按照防护规定进行个人防护。5例为SARS抗体IgG阳性,均为直接接触SARS病人和(或)与SARS病人标本或衣物直接接触者,比例为5／260;非直接接触SARS病人和(或)与SARS病人标本或衣物非直接接触者,比例为0／181,二者无统计学差异。5例SARS病毒IgG抗体阳性者分别来自SARS病房、CCU病区(该病区曾发生过临床疑似SARS病人)、儿科病房和门诊、标本转送中心及洗衣班,均不符合SARS的临床可能或疑似定义。结论医院目前的防护系统是完善的。     

唑来膦酸治疗绝经后骨质疏松患者2年结果分析

目的 分析唑来膦酸（商品名：密固达）治疗绝经后骨质疏松患者2年后的疗效和不良反应.方法 统计我院2009~2012年中连续使用密固达治疗2年的绝经后骨质疏松患者47例的临床资料,分析治疗前后患者骨密度变化情况及不良反应发生率.结果 首次使用密固达患者中,出现发热3例（6.4%）,肌痛3例（6.4%）,发热合并肌痛9例（19.1%）.其中1例出现高热（最高体温40.5 ℃）;1例出现双侧大腿内侧出血点,1 w后消退;其余不良反应少见.第二次输注后出现发热5例（10.6%）,但无高热发生.左侧股骨颈骨密度、左侧全髋骨密度、L2~4椎体骨密度,治疗后与治疗前以及治疗第2年与第1年比较均明显升高（P＜0.05）.结论 密固达治疗绝经后骨质疏松对骨密度提升效果明显,且总体安全性好,主要不良反应为发热和肌痛.     

动脉粥样硬化的分子成像:血管细胞黏附分子-1为靶向的磁性微泡和对比增强超声诊断效能

目的评价经血管细胞黏附分子-1(VCAM-1)(CD106)靶向的微泡,在磁性导引系统帮助下,能否提高对比增强分子超声(US)对主动脉粥样硬化的检出效能。材料与方     

MRI影像与CT影像勾画宫颈癌三维腔内后装放疗靶区体积的比较

目的 探讨在宫颈癌三维腔内后装放疗中,MRI影像与CT影像勾画大体肿瘤体积（GTV）的差异。 方法 选取2012年9月至2016年7月联勤保障部队第九〇〇医院收治的经组织病理学等结果确诊为宫颈癌Ⅱb~Ⅲb期的患者12例,年龄50~64岁。所有患者接受外照射及三维腔内后装放疗后行CT和MRI扫描,在OMP计划系统上进行影像融合,由3位放疗科医师分别在CT和MRI图像上2次勾画GTV,包括子宫体、子宫颈及宫颈原发病灶。CT、MRI图像分别勾画得到36个GTV（称为GTV_CT、GTV_MRI）,计算GTV_MRI与GTV_CT的比值R,其差异比较采用配对t检验。 结果 GTV_CT为(93.8±11.8) cm3,GTV_MRI为(71.1±3.1) cm3。3位医师勾画的GTV_CT、GTV_MRI最大与最小体积的差值分别为41.3 cm3、11.3 cm3。与医师3相比,医师1、2分别勾画的GTV均较大,比值R之间的差异均有统计学意义（t=?8.644、?5.043,均P=0.000）。3位医师勾画的GTV_MRI更接近,靶区体积受人为因素影响更小。 结论 CT影像引导的三维腔内后装放疗,受人为因素等影响,勾画GTV存在差异,应用MRI和CT影像融合技术可缩小这种差异。     

Cucurbitane-type triterpenoids from the stems of momordica charantia

Four new cucurbitane-type triterpenes, cucurbita-5,23(E)-diene-3beta,7beta,25-triol (1), 3beta-acetoxy-7beta-methoxycucurbita-5,23(E)-dien-25-ol (2), cucurbita-5(10),6,23(E)-triene-3beta,25-diol (5), and cucurbita-5,24-diene-3,7,23-trione (6), together with four known triterpenes, 3beta,25-dihydroxy-7beta-methoxycucurbita-5,23(E)-diene (3), 3beta-hydroxy-7beta,25-dimethoxycucurbita-5,23(E)-diene (4), 3beta,7beta,25-trihydroxycucurbita-5,23(E)-dien-19-al (7), and 25-methoxy-3beta,7beta-dihydroxycucurbita-5,23(E)-dien-19-al (8), were isolated from the methyl alcohol extract of the stems of Momordica charantia. The structures of the new compounds were elucidated by spectroscopic methods.     

Incidental discovery of nonpaternity during prenatal testing of genetic disease

Many ethical considerations surround prenatal genetic diagnosis, some of which are not anticipated. We present 2 cases in which misattributed paternity was inadvertently discovered during the workup of a father and son and a father and fetus, and present arguments for and against disclosure of this information. We recommend that healthcare providers must be prepared to deal with this kind of issue.