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监测修复
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Objective To investigate axonal regrowth from cervical spinal cord to avulsed nerve roots through an implanted collagen guidance channel in adult rats after brachial plexus injuries.Methods Fifty four adult SD rats underwent avulsion of the right C5 7 nerve roots. Group A(n=15):a collagen guidance channel was used to bridge the cervical spinal cord and the disconnected C6 nerve root. Group B(n=15):after the same repair procedure as in group A, a segment nerve autograft was freely introduced into the collagen...

Objective To investigate axonal regrowth from cervical spinal cord to avulsed nerve roots through an implanted collagen guidance channel in adult rats after brachial plexus injuries.Methods Fifty four adult SD rats underwent avulsion of the right C5 7 nerve roots. Group A(n=15):a collagen guidance channel was used to bridge the cervical spinal cord and the disconnected C6 nerve root. Group B(n=15):after the same repair procedure as in group A, a segment nerve autograft was freely introduced into the collagen channel. Group C(n=15):a nerve autograft was used to bridge the cord and the root. Group D(n=9):no repair was performed after avulsion of the nerve roots.Results Nine months surgery, electrophysiology and histology showed that neuroanatomic and functional connection were restablished between the cervical spinal cord and the denervated target biceps through the repaired root pathway in all treated animals. After analyzing the data obtained, no significant difference was found between the treated groups (Group A,B and C).No evident regeneration and no functional recovery was detected in the control group D.Conclusion The collagen guidance channel can be used to reconnect the spinal cord and the disconnected nerve root after brachial plexus injury in adult rats. At least when short gaps are required, this kind of channel appears to act as effectively as a nerve autograft for promoting axonal regrowth.

目的 探讨用胶原管 (collagentube)架桥于脊髓前角与撕脱的脊神经根间 ,促使轴突再生长 ,以修复脊髓到周围神经的传导通道。方法 用大白鼠制成臂丛损伤模型 ,分为四组。A组用胶原管架桥连接脊髓前角与撕脱的神经根 ;B组把自体坐骨神经分支移植物放入到连接于脊髓前角与神经根的胶原管内 ;C组用一段周围神经移植物架桥在脊髓与撕脱的神经根之间 ;D组为仅作神经根撕脱的对照。结果 采用电生理学监测修复后肌肉的电生理活动及收缩功能 ,通过病理学及组化学 ,观察脊髓和神经元的轴突再生状况并作了移植物的形态学分析 ,证明大量的新生神经纤维经过移植物进入到被修复的神经根及其周围神经 ,并使神经组织和肌肉重新形成了运动终板 ,从而恢复了一定的肌肉收缩功能。结论 用胶原管架桥作CNS到PNS神经再连接 ,是在神经移植实验中可促使轴突再生长的有效方法

This paper mainly deals with the effect of the alga blooming controlled in the restoration zone

研究了滇池东北沿岸带生态修复区抑制蓝藻水华的功能,对比监测了修复区内外水体中chl.a浓度,通过原位围隔试验研究了修复区内聚集藻类的降解过程,测定了水生植被的遮光率及其对藻类光合作用的影响。结果显示,修复区具有捕获富集和分解消除漂浮性蓝藻的作用,同时能通过水生植物的遮荫作用抑制藻类光合作用。在蓝藻水华暴发期(7-10月)修复区内蓝藻大量聚集,chl.a最高浓度达到修复区外的29倍;聚集在修复区内的藻类在微生物作用下迅速降解,chl.a降解过程符合一级反应动力学方程,反应系数为k=0.2173(时间单位为天);修复区内挺水植被的遮光率可以达到90%以上,能降低植被区内水体中藻类光合作用强度60%左右。

 
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