旁体

It may be due to the following two reasons: 1 High steric hindrance caused by rigid structure of substituted fluorenone preventsthe approach of the chiral reductor;2 The prochiral center is, moreover, linked to two coplanar aromatic rings, which due to strong conjugation are highly electronically similar and thus it becomes extremely difficult to distinguish between them.

主要是以下两个原因：1取代芴酮的刚性结构产生高的空间位阻，阻止了手性催化剂的接近；2潜手性中心旁的两个芳香环不仅立体构型非常相似，而且高度的电子相似，很难被手性配体识别。

CT scanning can discover the characteristic features of tuberculosis of spine,CT is superior to conventional roentgenography in delineating the extent of body destruction,involvement of the spinal canal and existence of paraspinal soft tissue masses,and is superior to MRI in delineating sequestra and sclerous bone and calcification of cold abscess.

CT能够较好地显示脊柱结核的特征性表现，特别是在椎体及附件骨质破坏程度、侵及椎管情况、椎旁软组织显示方面优于常规X线平片检查，对死骨片、骨质硬化及冷脓肿钙化的显示优于磁共振成像。

There were portal collateral vessels around the main portal vein in 8 patients and among them, there was 1 patient with the varix of gallbladder wall, 2 with gastroepiploic varix, 1 with varix on the bile duct wall, 1 with open of the retroperitoneal-paravertebral vein and the splenorenal vein, and 1 with open of the retroperitoneal-paravertebral vein.

结果 在门脉闭塞后，引起相应血管的纡曲扩张及侧支血管的形成，其中有门脉周围形成门－门侧支循环，胆囊壁静脉的曲张，胃网膜静脉的增粗纡曲，胆管壁静脉的纡曲扩张，腹膜后椎体旁侧支血管的开放，脾－肾静脉短路的开放，胃底食管静脉的曲张。

objective to study mri diagnostic value on multiple sclerosis.methods mri examination data of 31 patients with multiple sclerosis were analysised retrospectively.results total 184 lesions were detectived in 31 patients.most lesions were located on white watter area beside the lateral ventricle,and a few lesions were located on the spinal cord,cerebellum,brain stem and corpus callosum.the shape of lesion can be circle or ellipse.the lesion showed as slightly long t1 and long t2 signal.the acute stage lesions can have enhancement.conclusions ms have characteristic findings on mri image.mri can show the patholoic changes,and provide strong evidence for clinic diagnosis of multiple sclerosis.

摘 要］目的：探讨多发性硬化（muliplle sclerosis，ms）的mri特征表现及其诊断价值。方法：回顾分析31例临床诊断为ms患者的mri检查资料。结果：31例共发现病灶184个，病灶于侧脑室旁白质区、半卵圆中心及皮层下区最多见，其次见于脊髓小脑、脑干及胼胝体，部分可见视神经受累，病灶呈卵圆形或圆形稍长t1、长t2信号，矢状位像见病灶与侧脑室垂直，急性病灶增强扫描有的可呈结节状、环状或斑点状强化。结论：在mri图像上ms有特征性表现，mri能反应ms病理变化，为临床诊断ms提供可靠依据。

MethodsFrom July 1996 to July 2005, 29 cases' meningiomas in the falx brain were resected in addition to blocking artery with silvern clamp, controlled hypotension or preoperatively embolizing blood vessel. Larger tumors were resected piece by piece and removed at a time as possible.

方法1996年7月—2005年7月对29例大脑镰旁脑膜瘤在手术时应用银夹阻断供血动脉、术中采用控制性低血压或术前行供血血管栓塞；瘤体较大，尽量分块一次切除。

MethodsFrom July 1996 to July 2005, 29 cases' meningiomas in the falx brain were resected in addition to blocking artery with silvern clamp, controlled hypotension or preoperatively embolizing blood vessel.

1996年7月—2005年7月对29例大脑镰旁脑膜瘤在手术时应用银夹阻断供血动脉、术中采用控制性低血压或术前行供血血管栓塞；瘤体较大，尽量分块一次切除。

We investigated its effects on isolatedrings cut from radial arteries, gastroepiploic arteries, and internal mammary arteries harvested from patientsundergoing coronary artery bypass surgery.

作者研究了离体动脉（取自于用作冠状动脉旁路吻合术的桡动脉，胃网膜动脉，乳内动脉）对多巴胺的效应。

We investigated its effects on isolatedrings cut from radial arteries, gastroepiploic arteries, and internal mammary arteries harvested from patientsundergoing coronary artery bypass surgery.

作者研究了离体动脉（取自於用作冠状动脉旁路吻合术的桡动脉，胃网膜动脉，乳内动脉）对多巴胺的效应。

The tuberculosis: destraction of vertebral body and intervertebral disc and formation of sequester, disc collaps, gibbus deformity, osteoporosis and paraspinal abscesses with and without calcifications.

结核：以椎体和椎间盘骨破坏为主并有死骨形成，椎旁脓疡和骨质疏松变化比较常见。

Results Many neuronal cell bodies and fibers with dense mGluR7-like immunoreactivity were intensely distributed in the island of Calleja,hippocampus,dentate gyrus,medial habenular nucleus,olivary pretectal nucleus,zonal layer of the superior colliculus,superficial layers of the caudal spinal trigeminal nucleus,paratrigeminal nucleus,raphe magnus nucleus,raphe nucleus pallidus,locus coeruleus,superficial layers and lateral spinal nucleus of the spinal cord.

结果 mGluR7阳性浓染的神经元胞体和纤维主要密集分布于Calleja岛、海马、齿状回、内侧缰核、橄榄顶盖前核、上丘带状层、三叉神经尾侧亚核浅层、三叉旁核、中缝大核、中缝苍白核、蓝斑、脊髓背角浅层和外侧脊核。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。