超低温方法除鼠颈总动脉内皮细胞及处理后血管残余应变研究

采用超低温冷冻方法除去鼠颈总动态血管的内皮细胞,然后用Fung的残余应变方法研究血管无载荷状态管壁残余应变,以求除去鼠颈总动态血管的内皮细胞将人脐静脉内皮细胞种植在鼠颈总动态血管内壁上构建一种新的血管替代物。实验结果显示：超低温处理后血管内皮细胞完全除去,通过对其血管残余应变态的研究,发现超低温处理后血管的外壁残余应变要比正常情况的鼠颈总动态残余应变更大,而内壁残余应变与正常状态比较差异不明显。     

扫描探针显微技术测量血管内皮细胞的弹性

血管内皮细胞的功能与许多疾病间存在关联,但现在对其功能好坏的定量描述仍十分少见。该文以内皮细胞的弹性作为衡量其功能的一个标准。通过理论建立压痕测量杨氏模量的计算方法,并利用扫描探针显微镜从实验上得到了正常及过氧化氢处理过的人脐静脉内皮细胞的杨氏模量。发现过氧化氢处理后细胞的杨氏模量升高,表明通过杨氏模量来表征细胞活性是可行的。     

人VEGF受体II基因3区的克隆、表达研究

用RT PCR法从人胎儿脐静脉内皮细胞中克隆人VEGF受体II基因 3区 ,将其重组到 pAYZ表达载体中 ,构建成人VEGF受体II基因 3区表达载体。将该载体转化大肠杆菌 16C9,获得稳定表达 ,表达产物以可溶性状态存在 ;SDS PAGE和Westernblot分析显示 ,其分子量约为 14kD。以纯化的表达产物免疫Balb/c小鼠 ,眼球采血制备抗血清 ,抗血清效价在 10 3以上 ,并具有抑制VEGF诱导内皮细胞增殖的作用 ,在抑制肿瘤血管新生中具有潜在的应用前景。     

人VEGF受体Ⅱ基因3区的克隆、表达研究

用RT－PCR法从人胎儿脐静脉内皮细胞中克隆人VEGF受体Ⅱ基因3区，将其重组到pAYZ表达载体中，构建成人VEGF受体Ⅱ基因3区表达载体。将该载体转化大肝肠菌16C9，获得稳定表达，表达产物以可溶性状态存在；SDS－PAGE和Western blot分析显示，其分子量约为14kD，以纯化的表达产物免疫Balb/c小鼠，眼球采血制备抗血清，抗血清效价在10^3以上，并具有抑制VEGF诱导内皮细胞增殖的作用，在抑制肿瘤血管新生中具有潜在的应用前景。     

聚氨酯和聚四氟乙烯诱导内皮细胞炎性活化的免疫学机制

聚氨酯(PU)和聚四氟乙烯(PTFE)是两种常用的血液接触生物材料。该研究通过建立一个非接触的细胞共培养模型从而针对材料刺激血液单核细胞活化后诱导血栓的潜能进行评估。运用人脐静脉内皮细胞和人单核细胞系THP-1进行实验,首先将PU和PTFE与THP-1细胞直接接触,然后收集细胞上清液,用上清液培养人脐静脉内皮细胞,结果发现内皮细胞上调炎症趋化因子单核细胞趋化蛋白1(MCP-1),巨噬细胞炎症蛋白-1α(MIP-1α)的表达。为进一步探讨THP-1细胞在其中所起到的作用,用MTS试验研究细胞的增殖程度,用ELISA试验研究细胞所分泌的可溶性分子,结果发现这些材料能不同程度地刺激THP-1细胞增殖及活化,使其分泌细胞因子TNF-α及/或IL-1β。研究表明,与血液接触的生物材料可能通过作用于单核细胞,使其增殖及活化,分泌促炎症因子,使得内皮细胞发生炎性激活,最终导致血栓形成。     

APTE修饰钛氧膜并固定Ⅰ型胶原对内皮细胞生长的影响

在用磁控溅射合成具有一定特性的TiO2薄膜的基础上，使用一定浓度的NaOH溶液对其表面进行活化，并通过氨丙基三乙氧基硅烷（APTE）偶联固定I型胶原，通过傅立叶红外光谱（PTIR）、X射线光电子能谱（XPS）等检测手段进行材料处理前后表面性质表征．通过人脐静脉内皮细胞种植试验评价内皮细胞在样品表面的粘附和生长行为．研究结果表明：一定特性的TiO2薄膜经NaOH活化后，表面可产生活性的羟基基团；借助羟基，活化后的TiO2薄膜表面可以与硅烷偶联剂实现偶联固定，产生可以利用的活性氨基基团；进一步地，借助偶联剂的氨基基团，Ⅰ型胶原可以连接到TiO2薄膜表面形成涂层．体外内皮细胞培养实验表明，在处理后的TiO2薄膜表面，内皮细胞的粘附性和生长行为获得改善．因此，通过表面活化后涂覆APTE并固定Ⅰ型胶原修饰医用微弹簧圈，使其在体内更容易实现动脉瘤颈部的内皮化，以使动脉瘤与血液循环完全隔绝．     

磁控溅射制备TiO2薄膜对医用NiTi合金弹簧圈的表面改性

采用非平衡磁控溅射法制备了3种TiO2薄膜,对医用NiTi合金弹簧圈进行了表面改性处理.运用X射线衍射(XRD)、X射线光电子能谱仪(XPS)、原子力显微镜(AFM)﹑扫描电子显微镜(SEM)等手段系统研究了薄膜的表面结构、成分、微观形貌等,同时对薄膜的接触角进行了测试.通过血小板粘附和人脐静脉内皮细胞种植试验研究和评价了薄膜的血栓形成能力和内皮化性能.结果表明,医用NiTi合金弹簧圈表面镀一定结构和性质的TiO2薄膜后,其血栓形成能力和内皮化性能得到明显提高.     

Ti-O薄膜的溅射刻蚀微形貌表面对内皮细胞生长的影响

利用磁控溅射合成具有一定特性的Ti-O薄膜,并采用Ar离子溅射刻蚀该薄膜表面.运用原子力显微镜(AFM),X射线衍射(XRD)对刻蚀后的薄膜表面微观形貌、微结构进行表征.结果表明薄膜的结构未发生变化,表面的粗糙度减小.进一步的人脐静脉内皮细胞(HUVEC)种植实验表明表面粗糙度的变化对内皮细胞的贴附、生长与增殖有很大的影响.     

钽离子注入对镍钛合金表面生物学性能的影响

镍钛合金血管支架植入后可引发血栓和支架再狭窄, 且对损伤的血管内壁无修复作用, 需进行表面改性赋予其抗凝血和促内皮化生物学功能。本研究采用等离子体浸没离子注入与沉积(PIII&D)技术将钽(Ta)注入至镍钛合金, 研究Ta离子注入对镍钛表面理化特性及生物学性能的影响规律。结果表明, 调控Ta离子注入时间, 可在镍钛表面分别构建含Ta、Ta/Ta₂O₅、Ta/Ta₂O_5-x/Ta₂O₅三种不同组分的改性层。各种改性样品中, 含Ta/Ta₂O_5-x/Ta₂O₅的改性镍钛表面亲水性均更好, 可提供更多细胞附着位点, 促进人脐静脉内皮细胞早期粘附和铺展, 并提高其增殖能力。相比仅含单质Ta的改性镍钛表面, 含Ta/Ta₂O_5-x/Ta₂O₅改性镍钛表面的血液相容性更高, 血小板粘附数量显著减少, 且基本保持为未被激活的球形状态; 各组改性表面的溶血率远低于5%阈值, 均未发生明显溶血现象。上述结果说明, Ta离子注入改性镍钛血管支架在降低血栓形成、加速内皮化方面具有潜在应用。     

Ti-O薄膜表面明胶接枝改性及其细胞相容性

进行 3-氨丙基膦酸(APP)在Ti-O薄膜表面的自组装并在其表面接枝明胶分子,研究了细胞相容性.结果表明,APP自组装的最佳温度为80℃,时间为4 h,自组装后水接触角降低,表面C、N元素含量提高;表面明胶在模拟体液中前4d有少量释放,之后体系稳定,稳定后表面明胶的有效密度为2.3μg/cm2.接枝改性后的Ti-O薄膜表面促进了内皮细胞的生长和增殖,提高了表面的细胞相容性.     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

＂Three Transformations＂ and Standardization

During his inspection in Henan Province in May, Chinese President Xi Jinping stressed to ＂push forward the transformation from China Speed to China Quality, from Made in China to Created in China, and from Chinese Products to Chinese Brand＂. The ＂Three Transformations＂ are the specific requirements and goal of China＇s national development in the context that market should play a decisive role in the allocation of resources.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.     

SAC Delegation Visits AENOR and Signs Cooperation Agreements

正SAC Administrator Tian Shihong led the Chinese delegation to visit the Spanish Association for Standardization and Certification(AENOR)on September 15,2014.Mrs.Begona Cristeto,the Vice-Minister of Industry,Energy and Tourism of Spain,and Mr.Avelino Brito,the President and CEO of AENOR greeted the delegation.The two sides had a deep and friendly discussion on strengthening the cooperation between China and Spain in the standardization field and promoting the standardization work to support the development of economy and trade in the two countries.