共查询到20条相似文献，搜索用时 437 毫秒
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目的:探讨无脑儿与正常胎儿心脏结构的差异,为畸形胎儿的心脏发育研究提供形态学方面的资料。方法:用H.E染色,通过光镜观察无脑儿及正常胎儿的心脏结构。结果:无脑儿心脏的蒲肯野细胞数量明显低于同龄正常胎儿。结论:无脑儿神经系统发育异常影响其心脏内蒲肯野细胞的发育。 相似文献
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目的:探讨三种畸形胎儿肾上腺发育及组织学特征。方法:解剖观察肾上腺、整体取材、常规HE染色、光学显微镜观察肾上腺组织学结构。结果:无脑儿肾上腺未发育(缺如);胸腹壁联体畸形胎儿肾上腺发育欠充分;并(缺)指畸形胎儿肾上腺发育正常。结论:无脑儿因脑垂体、神经系统发育障碍,而致肾上腺不发育;联体畸形胎儿肾上腺发育较同龄正常胎儿迟缓。 相似文献
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目的:研究先天性畸形胎儿阑尾的解剖学及组织学结构,探讨几种畸形与阑尾发育之间的关系。方法:应用形态学方法,对先天性畸形胎儿阑尾进行解剖、观察,并制成组织切片,在光镜下观察其组织学结构。结果:3类10例先天性畸形胎儿中,并缺指畸形胎儿、胸腹联体胎儿及无脑儿阑尾的形态学及组织学结构均无明显异常。结论:不同先天性畸形胎儿对阑尾的生长发育影响不明显。 相似文献
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目的:探讨无脑儿肝脏结构的变化,为畸形胎儿肝脏发育研究提供形态学方面的资料。方法:用HE染色,通过光学显微镜观察无脑儿肝脏结构。结果:无脑儿肝脏的肝细胞和肝血窦出现异常。结论:胎儿神经系统的发育与肝脏的发育有一定联系。 相似文献
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目的:探讨无脑儿食管的组织结构,为无脑儿的组织器官发育提供形态学方面的资料。方法:分别取足月无脑儿和正常胎儿食管上、中、下段组织,常规切片,HE染色,光学显微镜观察。结果:无脑儿食管的组织学结构较正常胎儿分化较低,发育迟缓。结论:胎儿神经系统的发育影响其食管组织结构的发育。 相似文献
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目的:研究先天性畸形胎儿结肠的解剖及组织学结构,探讨几种畸形与结肠发育之间的关系. 方法:应用形态学方法,对先天性畸形胎儿结肠进行解剖、观察,并制成组织切片,在光学显微镜下观察其组织学结构. 结果:三类10例先天性畸形胎儿中,并缺指畸形胎儿结肠的形态学及组织学结构无明显异常;胸腹联体胎儿结肠结构异常;无脑儿结肠组织结构发育不全.结论:不同先天性畸形胎儿对结肠发育影响各异. 相似文献
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目的：探讨不同类型畸形对胎儿肺组织发育的影响程度,为畸形胎儿肺组织的发育研究提供形态学方面的资料。方法：解剖取肺组织,常规切片,HE染色,光学显微镜观察。结果：无脑儿肺组织发育明显滞后,并（缺）指胎儿和胸腹联体胎儿肺组织发育无明显差异。结论：神经系统的发育影响肺组织的发育。 相似文献
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目的:探讨并、缺指畸形胎儿指皮组织学结构与正常胎儿结构的差异.方法:观察并、缺指畸形胎儿大体形态,常规取材,HE染色,通过光学显微镜观察指皮组织学结构.结果:并、缺指畸形胎儿镜下观察指皮分层及附属结构与正常胎儿相似,但表皮颗粒层和棘层内朗格汉斯细胞比正常胎儿明显增多,未见触觉小体和环层小体.结论:并、缺指畸形胎儿的致畸因子可能影响其感觉神经末梢的发育和成熟,朗格汉斯细胞增多可能是遗传因素的作用或环境影响所致. 相似文献
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目的：为研究畸形胎儿的分类和三胚层分化异常的机理积累资料.方法：HE染色,光镜下观察多器官未发育畸形胎儿的组织结构.结果：胎儿几处组织呈正常发育状态,未见神经组织.结论：胎儿多器官未见发育,属罕见畸形.能见组织呈正常发育状态,三胚层分化不全. 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,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 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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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献