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角膜透明的
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  相似匹配句对
     Apoptosis in cornea
     角膜细胞凋亡
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     Progress in preservation of cornea
     角膜保存的进展
短句来源
     Nonlinear Theory of Electromagnetically Induced Transparency
     电磁感应透明的非线性理论
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     It is PVR and s ilicone oil to influence the repair of retinal detachment and transparency of co rneal grafts.
     影响视网膜复位及角膜移植片透明的因素有PVR和硅油填充等
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     These changes caused by inductionof the eye could promote the transparencyof the epidermal graft and transform itinto the cornea.
     由于眼球诱导作用引起的上述变化,都可促进表皮移植片转变为透明的角膜
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  corneal transparency
The advantage of the developed method is a partial recovery of affected corneal transparency.
      
Maintenance of corneal transparency is dependent on the integrity and functionality of the outermost corneal epithelium which itself is maintained throughout life by a population of limbal epithelial stem cells (LESC).
      
Thus, the regulatory effect of propranolol on corneal transparency is different in man and the rabbit.
      
· Background: Mineral balance is essential for maintaining corneal transparency.
      
The changes in corneal transparency, hydration and enzyme activities were studied.
      
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3 pieces of desiccated corneal grafts taken from normal subjects and preserved for 2-7 years were rehydrated for 20 minutes and examined in comparison with the normal fresh cornea, no differences were found in transparency and microscopic appearance. Projection electron microscopic examination revealed the same arrangement of collagen fibers, but in fibroblasts of the preserved cornea, cytoplas-mic membranes were broken, cell organelles were not clear enough and nuclear membranes were not intact, though no effect...

3 pieces of desiccated corneal grafts taken from normal subjects and preserved for 2-7 years were rehydrated for 20 minutes and examined in comparison with the normal fresh cornea, no differences were found in transparency and microscopic appearance. Projection electron microscopic examination revealed the same arrangement of collagen fibers, but in fibroblasts of the preserved cornea, cytoplas-mic membranes were broken, cell organelles were not clear enough and nuclear membranes were not intact, though no effect on transparency of the cornea was observed. Histochemically, staining with al-cian blue of the preserved cornea after rehydration for 20 minutes showed the same result as in the fresh cornea. Hemotoxylin and eosin staining of the cornea preserved for 7 years and rehydrated for 30 minutes revealed edema of the stroma and the disorderly arrangement of fibers and cells. In the cornea rehydrated for 60 minutes, the above changes became more obvious. After staining with alcian blue,the stroma of the preserved cornea after rehydration for 30 minutes was thicker than that of the normal one and took a light and uneven staining. The above phenomena were more pronounced in the cornea rehydrated for 60 minutes.By clinical and laboratory studies, it was assumed that the long-term preserved cornea by desiccation could be available clinically, but one must take care that the time for rehydration should not be so long as to free the cornea from edema and opacity, and not to affect the effect of keratoplasty as well.

将保存2~7年的3个正常人干燥角膜片复水20分钟与正常人新鲜角膜作对比检查。干燥保存角膜的透明性与新鲜角膜相同;光镜检查与新鲜角膜在形态上无差别;透射电镜检查二者的胶原纤维排列相同,仅干燥保存角膜的纤维母细胞的细胞膜有断裂,细胞器不够清楚,核膜不够完整,但不影响角膜的透明性;组织化学检查,复水20分钟者,aleian blue染色与新鲜角膜相同。干燥保存7年的角膜复水30分钟者(HE染色),基质水肿、纤维及细胞排列不整齐,复水60分钟的变化较30分钟者更甚。alcian blue染色检查,复水30分钟者角膜基质较正常者厚,染色淡,不均匀,复水60分钟者则更甚。临床证明,干燥长期保存角膜可以应用,但应注意复水时间不可过久,以防角膜水肿、混浊,影响手术效果。

Glycosaminoglycans (GAGs) and theirchanges in early corneal development of Buforaddei Strauch (from stage 16,neural tube,to stage 25.operculum completely closed)were studied with electron microscopic cyto-chemical method.Results show that synthe-sis of GAGs changes from non-sulfated tosulfated,and its content increases graduallywith the development of cornea.Hyaluronicacid (HA) in each part of cornea begins toincrease gradually from stage 16 to 21 (mouthopen stage),with its peak at stage 20(gill circulation...

Glycosaminoglycans (GAGs) and theirchanges in early corneal development of Buforaddei Strauch (from stage 16,neural tube,to stage 25.operculum completely closed)were studied with electron microscopic cyto-chemical method.Results show that synthe-sis of GAGs changes from non-sulfated tosulfated,and its content increases graduallywith the development of cornea.Hyaluronicacid (HA) in each part of cornea begins toincrease gradually from stage 16 to 21 (mouthopen stage),with its peak at stage 20(gill circulation stage) to 21,then decreases.In the mean time,contents of dermatam sul-fate (DS),chondroitin sulfate (CS),heparansulfate (HS) and heparin (Hep) increase gra-dually.It is considered that HA,HS andcollagen may be related to the migration ofmesenchymal cells,and HA promotes the ex-pansion and hydration of corneal stroma;sulfated GAGs are correlated with dehydra-tion of cornea,cell density and corneal tran-sparency;DS,CS,HS and Hep deposited amongcollagen fibrils could adjust their arrangement.All these changes would enhance transparen-cy of cornea.

本文用钌红显示氨基多糖的电镜细胞化学方法,较细致地研究了花背蟾蜍(Bufo raddeiStrauch)胚胎发育过程中(16—25期,即神经管至鳃盖完全封闭期)氨基多糖(GAG)在角膜早期发育中的变化。结果表明:GAG的合成由非硫酸化向硫酸化转变,且随着角膜的发育其含量逐渐增加。角膜各部位的HA在16—21期(胚胎开口期),其含量逐渐增加,且20(鳃血循环期)-21期达最高水平,此后含量下降,同时DS、CS、HS和Hep的含量上升。据分析,HA、HS和胶原与间充质细胞迁移有关,HA还可促使基质的膨胀和水化。硫酸化GAG在角膜的脱水、致密、细胞密度及角膜透明中起作用。胶原纤维间的硫酸化GAG能调节胶原纤维的规则化,故也有助于角膜的透明。

The changes and effects of glycosaminoglycans(GAGs)on early corneal morphogenesis of Bufo raddei Strauch(from stage 16,to stage 25)are studied

本文用组织化学方法研究了花背蟾蜍角膜早期形态发生中糖胺多糖(GAGs)的变化和作用。结果表明,在不同发育阶段,角膜各部位的GAGs出现规律性变化。在第19期预定角膜上皮开始形成时,透明质酸(HA)含量增加,在第22期达到最高,然后开始减少。间充质细胞从第20期开始迁移,因而提示HA与间充质细胞的迁移和内角膜基质原基的形成有关。角膜上皮硫酸角质素(KS)的含量在第22期增加,角膜的透明亦开始于此期。这表明KS是角膜透明的重要原因。本文还对这些变化与角膜形态发生的关系和GAGs在角膜早期分化中的作用进行了讨论。

 
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