健康大揭秘

几千年来,古今中外的人们都一直在寻找健康的秘密,但始终是如雾里探花,众说纷纭、莫衷一是。如今,我国当代发明家樊长喜先生却一语道破天机,他只用六个字便精准的揭示了健康的秘密——保持血管畅通。试想,如果血管不畅通,血液、氧气以及人体赖以生存的各种物质就无法正常运送,因此将会导致高血压、脑血栓、冠心病等一百多种常见病的发生。为了让血管保持畅通,樊长喜先生在经过十多年的精心研究和几千次的反复试验后,终于发明出能从体外净化血管的"血管净化器"。在荣     

人造肉饼你敢吃吗?

荷兰研究人员有望在今年制造出全球第一个"人造肉饼"。研究人员说,人造肉有助人类在解决饥饿问题同时保护水源、土地和能源。价格·25万欧元荷兰马斯特里赫特大学生物学教授马克·波斯特说,全球第一个人造肉饼有望于今年8月或9月问世。不过,这个     

你会夏吃姜吗？

夏季暑热,多数人食欲缺乏。鲜姜中的姜辣素能刺激胃肠黏膜,有利于食物的消化和吸收,并对心脏和血管有一定刺激作用,能使心跳加速,血液循环加快,汗毛孔张开,随着汗液排泄,带走体内的余热,对于防暑度夏有一定益处。因此“冬吃萝卜夏吃姜”是有科学依据的。     

我研究人员发现改善血管内膜增生新靶点 为临床治疗内膜增生性血管疾病提供了新思路最新发现与创新

中国科技网讯 第三军医大学大坪医院野战外科研究所神经内科教授张莉莉课题组研究发现,PPARγ（过氧化物酶体增生物激活受体-γ）通过抑制血管平滑肌细胞中TLR4（Toll样受体4）介导的炎症反应,改善血管内膜增生,为临床治疗血管增生性疾病提供了新思路。相关研究近日发表在英国权威期刊《心血管研究》上。     

放缓哀老的脚步

随着年龄的增长,我们的血管或多或少会出现弹性下降,钙盐在血管外壁沉积导致血管外壁钙化。卫生部北京医院大内科主任何青告诉大家如何保养好自己的血管,防止早衰。     

Inhibitive effects of anti-oxidative vitamins on mannitol-induced apoptosis of vascular endothelial cells

Objective： Study blood vessel injury and gene expression indicating vascular endothelial cell apoptosis induced by mannitol with and without administration of anti-oxidative vitamins. Methods： Healthy rabbits were randomly divided into four groups. Mannitol was injected into the vein of the rabbit ear in each animal. Pre-treatment prior to mannitol injection was per- formed with normal saline （group B）, vitamin C （group C） and vitamin E （group D）. Blood vessel injury was assessed under electron and light microscopy. In a second experiment, cell culture specimen of human umbilical vein endothelial cells were treated with mannitol. Pre-treatment was done with normal saline （sample B）, vitamin C （sample C） and vitamin E （sample D）. Total RNA was extracted with the original single step procedure, followed by hybridisation and analysis of gene expression. Results： In the animal experiment, serious blood vessel injury was seen in group A and group B. Group D showed light injury only, and normal tissue without pathological changes was seen in group C. Of all 330 apoptosis-related genes analysed in human cell culture specimen, no significant difference was seen after pre-treatment with normal saline, compared with the gene chip without pre-treatment. On the gene chip pre-treated with vitamin C, 45 apoptosis genes were down-regulated and 34 anti-apoptosis genes were up-regulated. Pre-treatment with vitamin E resulted in the down-regulation of 3 apoptosis genes. Conclusion： Vitamin C can protect vascular endothelial cells from mannitol-induced injury.     

Proliferation of endothelial cell on polytetrafluoroethylene vascular graft materials carried VEGF gene plasmid

Objective： To investigate whether vascular endothelial growth factor （VEGF） gene plasmid carried by polytetrafluoroethylene （PTFE） vascular graft materials could transfect endothelial cells （ECs） and promote their growth. Methods： PTFE vascular graft materials carried with pCDI-hVEGF121, pCDI or pEGFP were incubated in Tris-buffer solution and the values of optical density of 260 nm at different time were plotted, then the DNA controlled release curve was made. ECs derived from human umbilical vein were seeded on the pCDI-hVEGF121/pCDI/pEGFP-PTFE materials or tissue culture plates, ECs numbers were counted and VEGF protein concentrations at different time were measured by enzyme-linked immunoadsorbent assay method. Green fluorescent protein （GFP） expression in ECs on pEGFP-PTFE materials was examined with fluorescence mi- croscopy. Results： The controlled release curve showed that the gene released from PTFE materials was rapid within 8 h, then slowed down and that the gene released continuously even after 72 h. At 24, 72 and 120 h, ECs number and proliferation rate of pCDI-hVEGFI21-PTFE materials were higher than those ofpCDI or pEGFP-PTFE materials （P〈0.05）. VEGF protein concentration of pCDI-hVEGF121-PTFE materials was higher than that of pC DI or pEGFP-PTFE materials at 6, 24, 72 and 120 h （P〈0.01）. GFP expression in ECs on the pEGFP-PTFE materials could be detected by fluorescence microscopy. Conclusion： PTFE graft can be used as a carrier of VEGF gene plasmid, VEGF gene carried by PTFE can transfect ECs and promote ECs growth.     

管状人造血管拉伸夹持件的设计和应用

根据ISO 7198和YY 0500-2004,通过对常规织物强力仪夹持件的改进设计,在保持试样管状形态下,实现对人造血管周向和轴向拉伸性能的测试,并进行了验证性试验。周向与轴向拉伸夹持件可测直径2～45 mm的管状试样,并配置三档精度范围的传感器5.0、0.5、0.1 kN,满足不同管状材料的测试要求。验证结果表明,直径4 mm机织人造血管周向断裂强度(14.31 N/mm)大于轴向断裂强度(13.40 N/mm),这与临床上人造血管在周向需要更强的结构是相吻合的,且实验指标的CV值在一个可接受的范围内;另直径6 mm的3种不同结构的人造血管的周向断裂强度CV值在0.61%～3.51%,说明该测试仪器的精密度较高,重现性较好。该管状拉伸夹持件具有操作简便、功能性强和数据精准的优点。     

电视访谈中结构隐喻的顺应性研究

对中国电视访谈中作为一种交际策略的结构隐喻进行了定性研究,揭示其语用特征及其如何实现说话者所期待的交际功能,表明结构隐喻的出现是语境顺应的需求与结果,在交际中说话者使用它们来完成某种特定的人际功能.     

说谎作为交际策略的顺应性研究

谎言作为一种与真理相悖的语言现象普遍存在。本文尝试利用Verschueren的顺应性理论,从语用学的角度诠释说谎现象。说谎策略和其他语言现象一样,是一个不断进行选择的过程,说谎过程涉及认知、社会,文化等诸多因素,选择说谎策略的目的是为了顺应言语交际的三个层面：物理世界、社交世界和交际双方的心理世界。