间接测热法和反向Fick氏法测定心脏手术病人术后氧耗量的比较

目的 采用反向Fick氏法和间接测热法测定心脏手术后病人的全身氧耗,并比较两种测量方法的相关性和准确性。方法8例心脏手术术后病人,分别在入ICU后2h和6h时同时采用反向Fick氏和间接测热法测定病人的全身氧耗量。结果 间接测热法和反向Fick法测得氧耗分别是(16±30)ml·min-1·m-2和(127±23)ml·min-1·m-2,前者的测定结果显著高于后者(P<0.01)。相关分析显示两者有较好的相关性(r=0.92,P<0.01)。采用Bland和Altman统计分析提示两种测定结果的平均偏离值为(35.5±13.4)ml·min-1·m-2,其95％的分布范围是(9～62)ml·min-1·m-2,提示两种测量结果间的一致性较差。结论 两种方法测定心脏病人术后全身氧耗的结果有明显差异,其中反向Fick氏法的测定结果误差大、准确性差,而间接测热法是较好的临床选择。     

流行性出血热人群传播速度的定量研究

选取家鼠型ＥＨＦ中发病区人群血清ＥＨＦ抗体阳性率资料，试用可逆催化模型对ＥＨＦ人群传播速度进行定量研究。结果表明：所建立的可逆催化模型其理论值与实际值理论拟合较好，用χ＾２做配合适度检验，Ｐ〉０．０５。证实可逆催化模型可用来作ＥＨＦ人群中传播速度的定量研究。还发现在家鼠型ＥＨＦ疫区每１０００人中约有８０人因有效接触而获得感染，同时又有４０人血清ＥＨＦ抗体转阴。     

急性颅脑损伤早期血浆CNP和脑脊液乳酸测定的临床意义

目的 :探讨了血浆C -型利钠多肽 (CNP)和脑脊液乳酸水平在急性颅脑损伤早期的病理、生理作用。方法 :分别应用放射免疫分析血浆CNP水平和生化法测定脑脊液乳酸水平。结果 :在治疗前颅脑损伤患者血浆CNP水平非常显著地低于正常人组 (p <0 0 1 ) ,脑脊液乳酸水平明显高于正常人水平 (p <0 0 1 ) ,治疗 1 5天后与正常人比较无显著差异 (p >0 0 5 )。 结论 :观察血浆CNP和脑脊液乳酸水平的变化对研究急性颅脑损伤早期的病理生理变化、判断疗效及预后观察具有十分重要的临床意义     

布氏显微镜活血分析: 细胞流变学研究的新方法

布氏显微镜活血分析：细胞流变学研究的新方法骆秉铨＊黄荣国＊陈兴新＊细胞流变学是研究血细胞流动变形的科学，在方法学上发展了一些比较成熟的方法，但多不能直接动态观察细胞水平的真实改变，有待完善和创新。我们采用布氏多功能显微镜的活血分析法［１］，在高放大倍...     

急性心肌梗塞溶栓治疗后血清超氧化物歧化酶活性和丙二醛的变化

为探讨溶栓治疗急性心肌梗塞(AMI)对血清超氧化物歧化酯(SOD)活性和丙二醛(MDA)的影响。将61例AMI患者分成溶栓再通组(37例)、溶栓未通组(24例)进行治疗观察。结果溶栓再通组,不同时问测定的血浆SOD和浓度高于对照组(P<0.01)。而MDA的浓度是下降的。结论提示只有使梗塞相关血管(IRA)再通,才能通过增加心肌细胞内SOD活性,降低MDA,对抗氧自由基对心肌细胞的损害作用。     

高效液相色谱法测定奥硝唑栓的含量

目的　建立HPLC法测定奥硝唑栓中奥硝唑含量的方法。方法　以HypersilODS 2 50mm× 4mm为分析柱 ,甲醇 水 (34∶66)为流动相 ,检测波长为 31 2nm。结果　线性范围为 1～ 9μg·ml- 1 ,r=0 9978;平均回收率为 1 0 2 8% ,RSD为 1 98%。结论　本法简便、快捷、灵敏 ,可用于该制剂的质量检验     

腋淋巴结阴性乳腺癌中基因表达PTEN和微血管密度的关系及意义

目的:研究腋淋巴结阴性(ph node negative,LN N)乳腺癌中PTEN蛋白的表达,探讨与微血管密度lym(VD)及患者预后的关系。方法:应用免疫组化S-P法检测81例LN N乳腺癌及20例癌旁乳腺组织中PTEN和MCD34蛋白的表达,分析与各临床病理因素和预后的关系。结果:32.6%的患者PTEN蛋白表达减低或完全阴性表达,PTEN与乳腺癌病理分级,ER状态和复发转移显著相关;PTEN阳性表达组的5年生存率(83.7%)明显高于阴性表达组(66.7%)(P<0.05);PTEN的表达与M VD呈显著的负相关关系(r=-0.552,P<0.01)。结论:PTEN缺失是乳腺癌发生过程中的多发事件,并有抑制血管生成的作用,PTEN缺失和高M V D的LNN乳腺癌患者5年生存率低,两者的检测有助于提高评估LN N乳腺癌患者术后生存的准确性。     

Photoinduced transformations of stiff-stilbene-based discrete metallacycles to metallosupramolecular polymers

Control over structural transformations in supramolecular entities by external stimuli is critical for the development of adaptable and functional soft materials. Herein, we have designed and synthesized a dipyridyl donor containing a central Z-configured stiff-stilbene unit that self-assembles in the presence of two 180° di-Pt(II) acceptors to produce size-controllable discrete organoplatinum(II) metallacycles with high efficiency by means of the directional-bonding approach. These discrete metallacycles undergo transformation into extended metallosupramolecular polymers upon the conformational switching of the dipyridyl ligand from Z-configured (0°) to E-configured (180°) when photoirradiated. This transformation is accompanied by interesting morphological changes at nanoscopic length scales. The discrete metallacycles aggregate to spherical nanoparticles that evolve into long nanofibers upon polymer formation. These fibers can be reversibly converted to cyclic oligomers by changing the wavelength of irradiation, which reintroduces Z-configured building blocks owing to the reversible nature of stiff-stilbene photoisomerization. The design strategy defined here represents a novel self-assembly pathway to deliver advanced supramolecular assemblies by means of photocontrol.Natural systems provide many examples of self-assembled biosupramolecules that respond to external stimuli through conformational changes that ultimately play a role in carrying out their various biological functions. Mimicking this stimuli-responsive behavior in artificial systems is a promising route toward obtaining sophisticated molecular-based architectures with functional and structural tunability (1–3). Using the absorption of photons as a trigger is particularly attractive in that light-induced transformations maintain high spatial and temporal resolution without producing waste products even during multiple reversible switching sequences (4). In materials science, one of the most appealing characteristics of photochromic molecules is the direct conversion of light into mechanical energy based on their photo-reversible structural transformations (5). Among such chromophores, a stiff-stilbene moiety (1,1′-biindane) is useful owing to its unique characteristics (6). First, stiff stilbene can adopt either a cis or trans configuration with respect to its central double bond. Second, the high activation barrier between the two isomers (∼43 kcal⋅mol⁻¹, corresponding to a half-life of ∼10⁹ y at 300 K) makes thermal E/Z isomerization negligible at temperatures of 420 K and lower. Third, the quantum yield for the photoisomerization of either isomer is high (50%). Fourth, the stiff-stilbene core is readily substituted using well-established synthetic methods. Owing to these promising characteristics, Boulatov and coworkers (7) constructed a molecular force probe by integrating the moiety into a stretched polymer to mimic the strain generated in diverse functional groups. Yang and coworkers (8) reported hydrogen-bonded supramolecular polymers and studied their polymerization mechanisms and physical properties based on the photoisomerization of the stiff-stilbene units. Nevertheless, stiff-stilbene-based supramolecular entities are underexplored despite exhibiting properties that make the functionality potentially useful in the construction of photoresponsive supramolecular materials.Coordination-driven self-assembly is a powerful method of constructing supramolecular coordination complexes (SCCs) by the spontaneous formation of metal–ligand bonds that draws inspiration from the design principles of natural systems (9–20). This approach organizes metal acceptors and organic donors to prepare well-defined cavity-cored 2D metallacycles and 3D metallacages, which can be functionalized on their interior or exterior vertices for applications in host–guest chemistry (21, 22), catalysis (23), molecular flasks (24), bioengineering (25), amphiphilic self-assembly (26), and so on. The versatility of coordination-driven self-assembly can be enhanced by designs that allow for post-self-assembly modifications that in some cases result in complete structural transformations. For example, the Stang group previously demonstrated the transformation of self-assembled polygons by changing the angle between the bonding sites of a ligand from 180° to 120° upon treatment of Co₂(CO)₆ with an acetylene moiety (27). Yang and coworkers (28) reported the construction of multibisthienylethene hexagons capable of reversible supramolecule-to-supramolecule conversions induced by ring-open and ring-closed conformational changes of the bisthienylethene units. Herein we expand upon the transformations established by the systems described above designing SCCs capable of evolving from discrete metallacycles into infinite constructs using external stimuli.Supramolecular polymers can be defined as dynamically reversible polymeric arrays (29–37) that form from the explicit manipulation of noncovalent forces between monomeric units (38–43). Supramolecular polymer chemistry can readily complement coordination-driven self-assembly, as exemplified by our efforts to design hierarchical supramolecular polymerizations of discrete organoplatinum(II) metallacycles, thus accessing novel supramolecular polymeric materials, such as macroscopic hexagonal supramolecular polymer fibers (44), dendronized organoplatinum(II) metallacyclic polymers (45), and a responsive, cavity-cored supramolecular polymer network metallogel (46). Herein, we report photoresponsive supramolecular transformations between discrete organoplatinum(II) metallacycles and infinite metallosupramolecular polymers induced by a cis/trans conformational transition of a stiff-stilbene-based dipyridyl ligand. The self-assembly behaviors, physical properties, topologies, and morphologies of these SCCs can be regulated by photoisomerization, demonstrating this powerful approach to prepare advanced supramolecular coordination complexes.     

胃癌细胞三磷酸腺苷酶、5′—核苷酸酶和胞嘧啶单核苷酸酶活性定位的电镜细胞化学研究

应用电镜酶细胞化学方法对12例胃癌细胞三磷酸腺苷酶(Mg~(2+)—ATPase,Ca~(2+)—ATPase),5~1—核苷酸酶(5NPase)及胞嘧啶单核苷酸酶(CMPase)进行了超微结构水平的定位观察。结果表明:胃管状腺癌细胞腔缘微绒毛丰富,Mg~(2+)—ATPase、Ca~(2+)—ATPase及5NPase定位于微绒毛表面,反应明显,提示其功能代谢具有极性分布特点。粘液腺癌细胞出、入胞现象活跃,Mg~(2+)—ATPase、Ca~(2+)—ATPase及CMPase反应明显,认为与其粘液的大量分泌,营养物质的摄取与加工以及逃避免疫细胞的杀伤机制有关。低分化腺癌上述酶大都无反应或反应微弱。作者认为胃癌细胞的酶活性及其分布与其分化程度及功能状况有关。     

导乐陪伴分娩对初产妇心理影响的临床观察

目的 :观察导乐陪伴分娩对初产妇心理的影响。方法 :2 16例接受导乐陪伴分娩的初产妇为观察组 ,2 16例由丈夫或家人陪伴分娩的初产妇为对照组 ,采用症状自评量表 (SCL -90 )测定两组产妇分娩前后的总因子分 ,并分析两组产妇的SCL -90评分的差异。结果 :分娩前两组产妇总因子分差异无显著性( 8 4± 2 1/ 8 7± 2 4,t=1 2 5 ,P >0 0 5 ) ,而分娩后观察组SCL -90总因子分明显低于对照组 (阴道自娩组 :13 3± 3 4/ 18 6± 5 3,t=10 6 3,P <0 0 5 ;手术助产组 :15 2± 3 8/ 19 8± 6 3,t =4 41,P <0 0 5 )。结论 :导乐陪伴分娩对产妇的心理会产生有利的影响 ,应加以倡导