共查询到20条相似文献，搜索用时 78 毫秒
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一、皮肤究竟由哪几个部分组成?不少资料上都认为:皮肤由表皮、真皮、皮下组织三层构成.但笔者认为皮下组织并不是皮肤的组成部分,只是由于皮下组织与皮肤的关系密切,所以才在讲授皮肤时提到. 相似文献
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宝宝皮肤的特点初生婴儿的皮肤需要三年左右的时初生婴儿的皮肤需要三年左右的时间才能基本发育成熟,所以,它的功能和结构都与成人的皮肤有很大的差别。3岁以下的婴幼儿皮肤仅有成人皮肤十分之一的厚度,表皮是单层细胞,皮肤真皮中的胶原纤维少、组织较薄,皮肤非常幼嫩、敏感,抵抗干燥、寒冷环境的能力比较弱。 相似文献
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在针刺过程中根据不同区域组织的结构和性质,给出了不同的生物力学模型：表皮无血管无神经,致密而坚硬,可以看作类固体;真皮及皮下结缔组织中血管神经等分布广泛,疏松而柔软。是典型的软物质。从杨氏弹性模量、压缩系数、动摩擦系数等方面对表皮的力学性质进行了研究分析,同时对结缔组织中具有代表性的物质胶原纤维和弹性纤维的力学性质进行了研究分析。结果表明提插法行针主要阻力来自表皮,“得气”后的主要阻力可能来自结缔组织收缩;捻转法行针主要阻力来自胶原纤维和弹性纤维的缠绕。弹性纤维独有的热力学性质在传递针刺能量中可能起着重要作用。 相似文献
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皖东黄牛部分血液生理生化指标的测定 总被引：1，自引：0，他引：1
测定皖东黄牛部分血液生理生化指标,为皖东黄牛研究、利用和开发提供基础实验数据。取成年皖东黄牛60头,公母各半,颈静脉取抗凝(肝素)与非抗凝血各一份,将抗凝血样放入血液自动化分析仪内测定生理指标;非抗凝血离心,血清采用全自动生化分析仪内测定生化指标。结果表明:皖东黄牛血红蛋白浓度、红细胞压积、平均红细胞体积、平均红细胞血红蛋白含量、平均血小板体积低于参考值;白蛋白、钙含量略低于参考值,谷草转氨酶低于参考值,葡萄糖显著低于参考值,甘油三酯、尿酸未见参考值,填补空白。 相似文献
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用冷冻切片法制片,光学显微镜观察,研究莲雾叶的解剖结构．结果表明,莲雾叶为典型的异面叶,同时表现出许多中生形态．表皮由一层排列紧密形状不规则的表皮细胞组成,细胞外壁角质膜较厚,上表皮角质膜一般较下表皮角质膜厚2μm．叶肉组织发达,其间分布有不规则形状晶体．栅栏组织由1-2层排列整齐的圆柱形细胞组成．横切面上栅栏组织厚度与海绵组织厚度之比为1：3．主脉发达,有由木纤维和厚壁细胞组成的维管柬鞘,具周生韧皮部．这些特征与其喜高温喜湿的生活习性相适应． 相似文献
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人体毛发和皮脂腺、汗腺、指甲一样都是皮肤的附属物,由角化的表皮细胞变化而来。毛发分为长发、短发和零毛三种。长毛为头发、胡须、阴毛和腋毛等。短毛为眉毛、睫毛、鼻毛和外耳道的短毛。毳毛俗称汗毛,分布于面部、颈、躯干和四肢等处。人体除手掌、足底、唇红,乳头和阴茎头等处外,几乎都有毛发生长。人体各部位的毛发粗细和形状各不相同。毛发中以头发最粗且长,断面呈圆形。阴毛、腋毛呈波浪状或卷缩,断面呈椭圆形。眉毛断面似纺锤状。躯干及四肢的毳毛最细。 毛发由毛根和毛干组成,露出皮肤以外的部分叫毛干,埋于皮肤内的部分是毛根。毛根外包着由上皮细胞及其周围结缔组织所构成的 相似文献
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脊椎动物的皮肤紧贴在身体的外面,具有保护的功能。外层为表皮,由上皮组织构成,来自外胚层;内层为真皮,由结缔组织构成,来自中胚层。在真皮内有微血管、淋巴管、神经和平滑肌的分布。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Anton Franks 《English in Education》1999,33(2):39-49
This paper looks at the way drama works to bring a model of an arts curriculum into reality. He also shows how drama is valuable when discussed as a separate, autonomous subject in the school curriculum as opposed to one subsumed within English. He argues for a view of the arts and gives an example of a sequence of work in an English GCSE class based around Arthur Miller's play View from the Bridge. From this he draws out several strands about the relationship of the drama curriculum to the individual students and teachers, the school, and to culture. He also emphasises the primacy of performance in drama education. 相似文献