微波对超低温细胞复温的可行性研究和若干问题的探讨

采用微波炉中的谐振场和外辐射天线的平面波对冻存在－１９６℃的活细胞进行复温试验。结果表明：谐振场加温迅速但极不均匀，造成细胞大量死亡。平面电磁波微波泄漏大，效率低，加温时间过长，不能应用。本文阐述了微波对超低温细胞复温的可能性和现有微波仪不宜进行细胞复温的原因，并提出改进设计的建议。     

306名大学生错失恐惧与社交媒体倦怠的关系:睡眠质量和负性情绪的链式中介作用

目的 探讨大学生睡眠质量、负性情绪在错失恐惧与社交媒体倦怠间的中介作用。 方法 采用错失恐惧量表、社交媒体倦怠量表、匹兹堡睡眠质量指数量表、抑郁-焦虑-压力量表简体中文版对306名大学生进行调查。 结果 错失恐惧、社交媒体倦怠、睡眠质量和负性情绪之间呈两两正相关;错失恐惧能正向预测社交媒体倦怠;睡眠质量和负性情绪在错失恐惧和社交媒体倦怠之间起单独中介作用,且睡眠质量和负性情绪在错失恐惧与社交媒体倦怠之间起链式中介作用,负性情绪各维度效应皆成立。 结论 睡眠质量和负性情绪能够为错失恐惧对社交媒体倦怠的影响提供一个解释机制,大学生的错失恐惧既可以直接影响其社交媒体倦怠水平,也可以通过睡眠质量、负性情绪的独立中介效应以及睡眠质量-负性情绪的链式中介效应间接影响。     

实时定量RT-PCR的原理及方法

实时定量RT-PCR广泛应用于定量检测mRAN表达水平,为基础研究、分子药物学和生物技术研究提供了一种有力的方法。该法具有易操作、高通量、敏感性高和特异性强的特点,随着新酶、新探针和新仪器的发展而得到快速的发展。本文将对实时定量RT-PCR的定量原理、仪器应用、探针种类的研究进展以及细胞因子mRNA表达水平检测上的应用作一综述。     

装潢居室空气中挥发性化学物的遗传毒性研究

目的探讨装潢居室空气中挥发性化合物的遗传毒性.方法采用小鼠骨髓嗜多染性红细胞微核试验和小鼠精子畸形试验检测居室装潢后空气中挥发性化合物的遗传毒性.结果该化合物对小鼠呼吸系统有明显的刺激作用,与阴性对照组比较,高、中、低剂量组的微核率、精子畸形率均有显著差异性.结论居室装潢后室内空气中挥发性化合物具有遗传毒性作用.     

The Cross-Reactive Idiotopes Recognized by the Monoclonal Antibodies 9G4 and LCI are Located in Framework Region 1 of Two Non-Overlapping Subsets of Human VH4 Family Encoded Antibodies

The monoclonal anti-idiotopic antibodies LCI and 9G4 bind two non-overlapping sets of V_H4 encoded antibodies. 9G4 exclusively binds V_H4–21 encoded antibodies, while LCI binds antibodies derived from V_H4 family gene segments V71-2, V71-4, V_H4-18, V_H72-I and V2-1. The V_H4–21 gene segment is utilized by most cold agglutinin (CA) antibodies with I/i specificity, while antibodies encoded by other V_H4 gene segments are associated not with CA disease, but primarily with rheumatoid-factor (RF) activity.
We previously determined that the idiotope to which 9G4 binds in V_H4-21-derived antibodies is located in framework region l (FR1). In the present study, by using mutational analysis involving individual framework- and complementarity-determining region exchanges between V_H4-2I- and V71-2-encoded antibodies, we have found that the idiotope to which LCI binds in V71-2-derived antibodies also maps to FR1. The LC1 idiotope is heavy (H)-chain associated, but requires pairing with a light (L) chain for LCI binding. Recombinant antibodies composed of a variety of kappa (k) and lambda L chains paired with either a V71-2 or V_H4–21 chain were produced in the baculovirus expression system. LCI bound all of the k-containing antibodies but did not bind the V71-2-encoded H chain alone nor to the two A-containing antibodies. This experiment demonstrates that not all light chains exert equivalent influence on the conformation of the H-chain idiotope. These results indicate that the FR1 of V_H4-encoded antibodies is immunogenic and suggest a physiological role of FR l during an immune response.     

全脑全脊髓照射仰卧位CT模拟定位技术

目的：探讨全脑全脊髓照射仰卧位CT模拟定位技术。方法：7名患者分别躺在真空负压袋固定器上，进行CT模拟定位，打印正侧位数字重建射线彩像（DRR）图，放射治疗前拍摄正侧位定位验证片，测量解剖参考点和射野边界之间的距离。结果：患者左右方向及背腹方向误差在2mm以内。人体上下方向误差在4mm以内；放疗后，患者受照射的皮肤部位均出现色素沉着。结论：仰卧位全脑全脊髓照射CT模拟定位技术可用于俯卧位不合作的患者。     

改变在体兔左心室后负荷对其电生理参数的影响

目的：探讨改变在体兔左心室后负荷对室性心律失常发生情况及左心室电生理参数的影响。方法：改变左心室后负荷，观察室性心律失常发生情况，并测定左心室舒张阈值（ＶＤＴ），相对不应期（ＲＲＰ），有效不应期（ＥＲＰ）及其不应期离散和心室纤颤阈（ＶＦＴ）。结果：逐级增加左心室后负荷（ＡＢ级）可使左室空间ＲＲＰ，ＥＲＰ离散增加（Ｂ级，Ｐ＜００５），ＶＦＴ降低（Ｂ级，Ｐ＜００１）；各实验动物均出现室性心律失常（Ｂ级）；而逐级减小左室后负荷（ＣＤ级），心室电生理参数无变化（Ｐ＞００５），各实验动物亦无室性心律失常发生。结论：增加左心室后负荷诱发室性心律失常，与左室空间不应期离散增加有关。     

双歧杆菌对早产儿食道pH值的影响及临床意义

目的为探讨双歧杆菌对早产儿食道pH值的影响，及其对早产儿易发生的消化道疾病的防治意义。方法我们采用便携式24hpH值自动记录仪，对61例早产儿进行了食道pH值的动态监测。结果口服双歧杆菌活菌制剂组的30例早产儿，食道pH值明显高于未服药的对照组，t=2．4093，P＜0．05。总pH值＜4的时间占总观察时间的百分比显著小于对照组。并且治疗组发生消化道疾患的人数也较对照组少。结论早产儿口服双歧杆菌活菌制剂可以减少胃食道反流等消化道疾病的发生。     

中性粒细胞分布数据序列小波变换研究

目的　研究小波分析结合复倒谱处理血膜中中性粒细胞分布数据信号的新方法及临床意义。方法　利用“虚拟盒计数法”方法采集血膜中的细胞分布数据信号 ,然后进行小波变换结合复倒谱分析方法处理。结果　提出血膜中细胞分布状态的“密集子”新概念。计算出小波变换复倒谱主极大值 ,并以此作为不同情况下血膜中中性粒细胞分布“密集子”间距的准确参数。结论　方法简单 ,能较好的反映血膜中细胞分布状态的微观组织结构特征 ,是血膜中细胞“密集子”表达定征的一种有效方法     

Clinicopathologic features and incidence of invasive lobular carcinoma in Japanese women

Intending to clarify the true Incidence of Invasive lobular carcinoma of the breast In Japanese women as well as the frequency of unilateral multlcentriclty, 362 cases of clinically defined monocentrlc breast cancer without pre-operative biopsy (previously fine needle aspiration or needle biopsy were routinely carried out for every case) were examined by whole mammary gland serial sectioning. On the basis of pathology and the World Health Organization classification of breast tumors, each case was assigned to one of two main histologlc types: Invasive lobular carcinoma (ILC) or Invasive ductal carcinoma (IDC). Invasive lobular carcinoma was further separated into classic and variant types by employing previously published criteria. Twenty-one cases of ILC (5.8%) were diagnosed, which Is more than In most previous Japanese studies. Unilateral multicentric breast carcinoma was detected In 9.5% of ILC and 16.1% of IDC (the difference was found not significant). Microscopically, ILC tumors were found to be, on average, larger than IDC. Patients with classic type ILC tended to be younger than those with variant type or IDC. Estrogen receptor expression was found more frequently In variant type ILC than in classic type. These results suggest that the incidence of invasive lobular carcinoma of the breast In Japanese women is low and that unilateral multicentricity Is not significantly higher in ILC than in IDC.