前哨淋巴结活检术应用于外阴癌的初步研究

目的 探讨前哨淋巴结活检术(SLNB)应用于外阴癌的可行性.方法 选择2004年10月-2008年4月间于中国医学科学院肿瘤医院接受手术治疗、术中采用SLNB的外阴癌患者21例,其中处于研究前期(即2005年5月前)的11例患者采用染料法识别前哨淋巴结(SLN)、处于研究后期的10例患者采用核素-染料联合法识别SLN,术后行常规病理检查.以病理检查结果为金标准,观察SLNB的检测效果;并观察与SLNB相关的并发症的发生情况.结果 21例患者中,20例(95%)检出SLN,其中8例为单侧腹股沟、12例为双侧腹股沟.20例SLN阳性患者共检出83枚SLN,每例患者平均检出4.2枚(1～9枚),每侧腹股沟平均2.6枚(1～6枚).其中,染料法每例患者平均检出4.4枚、每侧腹股沟平均2.5枚,核素-染料联合法每例患者平均检出3.9枚、每侧腹股沟平均2.7枚,分别比较,差异均无统计学意义(t=0.459,P=0.652;t=-0.421,P=0.717).20例SLN阳性患者腹股沟浅组淋巴结中均检出SLN,其中1例双侧腹股沟深组淋巴结中也检出SLN.20例SLN阳性的患者中,8例(10侧腹股沟)术后病理检查显示腹股沟淋巴结转移,其中7例患者(9侧腹股沟)的转移淋巴结中均包括有SLN、1例(1侧腹股沟)出现假阴性.以SLN识别预测同侧腹股沟淋巴结转移的假阴性率为10%(1/10),阴性预测值为96%(22/23).未发现与SLNB相关的损伤及不良反应.结论 SLNB应用于外阴癌安全、可行,以SLN预测同侧腹股沟淋巴结转移具有较高准确性.     

先天性齿槽突裂整复术(附10例报告)

应用自体髂松质骨髓颗粒植入整复10例单侧上颌齿槽突裂,并关闭口鼻瘘。10例伤口一期愈合,术后观察3~6个月,外观改善明显,X线检查有明显骨形成,骨密度近似正常骨组织,两者间无明显界限。     

依沙吖啶引产失败后用卡前列甲酯栓的疗效

目的：观察３５例中期妊娠用依沙吖啶１次羊膜腔注射引产失败后，再用卡前列甲酯栓的效果。方法：卡前列甲酯栓１ｍｇ，放置于阴道后穹窿，若３ｈ后无宫缩，再放１次。结果：３５例孕妇引产成功率１００％。引产后２４ｈ内阴道流血量２００±２０ｍＬ。出现腹泻，恶心等不良反应各１例。结论：卡前列７甲酯栓用于对依沙吖啶中期引产失败后效果满意。     

The effect of caffeine on cue exposure responses in ex-smokers

The responses of ex-smokers to an experimental cue exposure trial, and the effect of caffeine on these responses, were compared with those of a matched group of control subjects in a placebo controlled single-blind cross-over design. In contrast to placebo, caffeine protected the ex-smokers from a surge of anxiety and rise in blood pressure associated with exposure to smoking-related cues. Caffeine had no significant effects on the control group at this dose (equivalent to a single cup of strong coffee). The results are discussed with reference to Stewart's conditioned appetitive motivational model of addiction. It is suggested that further work may identify caffeine as an adjunct to smoking relapse prevention measures.     

Binding of cardiolipin to polystyrene beads: evidence for a lamellar phase orientation

Summary. The association of cardiolipin with polystyrene beads was studied using ³¹P-NMR and electron microscopy. In the presence and absence of fetal calf serum, cardiolipin appeared to bind to the polystyrene beads in lamellar phase as assessed by ³¹P-NMR imaging. Electron microscopic analysis revealed an even coating of phospholipid about the beads with extensive micelle binding. Cardiolipin-coated beads challenged with ACA-positive sera followed by immunogold indicated antibody bound to micelles associated with the bead. Studies conducted with ACA IgG purified from patient sera indicated that some ACA bound to CL beads in the absence of a source of ACA cofactor (i.e. gelatin-blocked beads), some ACA required β₂-GPI for binding (i.e. no binding in the presence of β₂-GPI-depleted plasma), whereas other ACA which showed negliglible binding with gelatin-blocked beads, showed enhanced binding in the presence of /?₂-GPI-depleted plasma. The data indicate that: (1) cardiolipin binds to polystyrene beads in lamellar phase, (2) ACA bind to phospholipid micelles bound directly to the polystyrene beads, and (3) ACA differ between individuals displaying varying phospholipid and phospholipid/cofactor substrate specificities.     

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.