新生儿脐血瘦素水平的初步研究

目的:研究脐血瘦素水平与新生儿性别、孕周、出生体重、身高、体重指数及胎盘重量的关系。方法:应用酶联免疫法(ELISA)测定脐血瘦素水平,共测定了46份样本,运用统计学方法分析其与新生儿性别、孕周、出生体重、身高、体重指数BMI(即体重除以身高的平方,单位为kg·m~(-2)及与胎盘重量等的关系。结果:脐血瘦素水平与出生体重、身高、体重指数及胎盘的重量有着显著性相关,而男女性别间脐血瘦素水平无显著性差异。结论:脐血瘦素水平与新生儿孕周、出生体重、身高、体重指数及胎盘重量有密切关系,临床测定脐血瘦素水平对预测胎儿出生体重和生长发育有重要意义。     

Neural stem cell transplantation in the repair of spinal cord injury

Neural stem cells are a pronising candidate for neural transplantation aimed at neural cell replacement and repair of the damaged host central nervous system (CNS). Recent studies using neural stem cells have shown that implanted neural stem cells can effectively incorporate into the damaged CNS and differentiate into neurons, astrocytes, and oligodendrocytes. The recent explosion in the field of neural stem cell research has provided insight into the inductive factors influencing neural stem cell differentiation and may yield potential therapies for several neurological disorders, including spinal cord injury. In this review, we summarize recent studies involving neural stem cell biology in both rodents and humans. We also discuss unique advantages and possible mechanisms of using neural stem cell trans plantation in the repair of spinal cord injury.     

ZSX1140D型输送带无伤检测仪在燕子山矿的应用

介绍了ZSX1140D型输送带无伤检测仪的用途、适用范围、型号的组成及代表意义,阐述了ZSX1140D型输送带无伤检测仪的工作原理,对比了无伤检测仪安装前后ZSX1140D型输送带的运行情况。     

羟乙基淀粉预扩容用于腰-硬联合麻醉剖宫产术的临床观察

目的:观察在腰-硬联合麻醉剖宫产术中使用羟乙基淀粉预扩容的临床效果。方法:选择腰-硬联合麻醉(CSEA)下择期剖宫产手术60例,随机分为2组,HES组(n=30)给6%羟乙基淀粉130/0.4氯化钠注射液500 mL进行预扩容,LR组(n=30)给予乳酸钠林格注射液500 mL进行预扩容。观察两组患者麻醉后低血压、恶心呕吐、麻黄碱的用量及术中液体用量的情况。结果:HES组麻醉后低血压的发生率、麻黄碱的用量及术中液体用量均低于LR组,差异有统计学意义(P<0.05)。结论:羟乙基淀粉预扩容能更好维持剖宫产术中血流动力学的稳定,保障产妇和胎儿的安全。     

Adhesion Enhancement Mechanism of Plasma-Modified Tire Cord

Tire cord was treated with oxygen glow-discharge plasma in order to enhance the adhesion.The treated surfaces were characterized by scanning electron microscopy (SEM),specific surface area analysis Brunauer-Emmett-Teller (BET),X-ray photoelectron spectroscopy (XPS),contact angle measurement,and the standard H-pull test.Results indicated that the plasma treatment could increase the surface roughness,modify the nature and density of surface functional groups,and greatly improve the surface energy and adhesion of tire cord.After long term storage in ambient air,the enhanced adhesion decreased slightly.     

注射酮色林对脊神经结扎大鼠脊髓背角和背根神经节nNOS表达的影响

通过结扎大鼠L5脊神经建立神经病理性痛模型.手术后第3日开始皮下注射酮色林(0.3 mg·kg-1)或其溶剂DMSO(体积分数为0.8%),每d1次,2周后灌流、取材,免疫组织化学实验显示神经结扎后L4背根神经节(DRG)和脊髓背角Ⅰ-Ⅱ层nNOS的表达均上调.然而皮下注射酮色林阻断5-HT2A受体,使L4 DRG和脊...     

聚酰胺6帘线/天然橡胶复合材料中纤维体积含量对拉伸性能的影响

纤维体积含量是决定纤维增强复合材料各项力学性能的一个重要的参数。本文通过理论分析和实验.就纤维体积含量与聚酰胺6(锦纶)帘线/天然橡胶复合材料的拉伸强度、拉伸模量的关系进行了研究.得到了纤维体积含量的理论下界极限和上界极限以及许用的上界极限。实验结果提供了有关参数和影响因素,这将对聚酰胺6帘线/天然橡胶复合材料的细观力学设计提供依据。     

脐带血T淋巴细胞集落培养和亚群的关系

应用细胞培养和间接免疫荧光法测定脐带血，成人外周血，成人骨髓的Ｔ淋巴细胞集落形成情况及培养前后淋巴细胞亚群的变化。结果表明：脐带血的ＣＦＵ－ＴＬ显低于成人外周血（Ｐ〈０．０１），略低地成人骨髓（Ｐ〈０．０５）；培养前脐带因的ＣＯ３、Ｃ含量均显低于成人外周血（Ｐ〈０．０１），成成人骨髓相近似。脐带血的ＣＤ８细胞含量与成人外周血和成人骨髓相似（Ｐ〈０．０５）；培养后的ＣＦＵ－ＴＬ中的ＣＴ３细胞含量     

A STUDY OF PET TIRE CORD TREATED BY LOW TEMPERATURE PLASMA

The process of treating the PET tire cord (210D/3×2) by low temperature nitrogen and airlow temperature plasma and dipping in RFL (resorcinol-formaldehyde-latex) adhesive system wasstudied.The H-pull test value can be improved from about 35 N/cm of untreated sample to 55N/cm of nitrogen plasma treated sample.The photograph of SEM demonstrates that the adhe-sion between nitrogen plasma treated tire cord and rubber has reached the strength of rubber.Airplasma treatment has bad effect on adhesion improvement.The mechanism of plasma treatment on the surface of the PET tire cord and the mechanism ofadhesion improvement are investigated by diffuse reflection infra-red spectrum and XPS (X-rayphotoelectron spectroscopy).From the spectral analysis,it is believed that the contribution to im-provement of the adhesion of the tire cord is the oxidation on the surface.The serious breaking ofthe chemical bonds on surface can cause the adhesion inferior.     

Can we be aware of both visceral and somatic sensations via a single neuronal pathway?

Sensory information arising from somatic and visceral area is thought to be respectively transmitted to the brain by two distinct sensory neuronal systems, the somatic and visceral sensory pathway. A novel and unique spinal sensory system, the spinosolitary tract-dorsal column postsynaptic neuronal system (SST-DCPS), was physiologically and anatomically identified. The spinal neurons project to both visceral (the solitary tract nucleus) and somatic sensory (the dorsal column nuclei) nuclei via their branched axons and receive both visceral and somatic sensory information ascending from periphery through dichotomized primary afferents and descending from their targets via their branched axons. The brain might thus be aware of both visceral and somatic sensation via a single SST-DCPS neuronal channel. The finding of SST-DCPS system, as an example, might be considered as an intersection or fuzzy set of the SST and DCPS system and the concept of dichotomy in classification of neurons and neuronal pathways might thus be challenged.