并在此条件下合成了多种环缩醛，收率62。
结论静脉环缩术是治疗严重下肢深静脉倒流性疾病的有效方法。
Conclusion Annular constriction is effective in treating severe venous insufficiency of legs.
目的研究和评价应用静脉环缩术治疗严重下肢深静脉倒流性疾病的机理和疗效。
Objective To study the mechanism and therapeutic effects of annular constriction for severe venous insufficiency of legs.
治疗组病人住院期间行瓣膜环缩术，对照组病人住院期间行血管内瓣膜成形术。
The patients in therapeutic group were performed with valve constriction . The patients in control group were performed with internal valvuloplasty .
本发明茼蒿素类化合物及其合成方法与应用，该化合物具有烯醇醚-螺环缩酮-缩醛和不饱和侧链。
The invention relates to garland chrysanthemum extract compounds, and a synthesis method and application thereof. The compounds have enol ether-spiro ketal-acetals and unsaturated side chains.
通过对该合聚物的IR和NMR谱图分析，得知该聚合物含有酯基和酮基的结构单元，以及环缩醛的侧链。
The IR and NMR spectra of the polymers indicated that the polymer structure contained ester and ketone units in the backbone, and a cyclic acetals as side chain.
目的利用彩色多普勒超声技术通过观察术前和术后腘静脉相关指标，评价腘静脉环缩术治疗下肢深静脉返流性疾病的疗效。
Objective To evaluate the operation of annular constriction of popliteal vein for treating deep venous insufficiency of low limbs by color Doppler imaging.
在扩眼体设一斜水眼，在导眼体与扩眼体之间连接一缩径增效排屑环，强化了冷却清洗作用，从而保证钻头有较好的使用效果。
Set up a slant water hole at reamer, and connect the reamer and pilot with reducing synergy flute, which strengthen the cooling and washing function and ensure the bit's effects.
目的总结二尖瓣后环缝缩治疗二尖瓣关闭不全(MI)的临床经验。
Objective to summarize the experience in treating mitral insufficiency (mi), due to secondary annular dilation in the posterior portion of the annulus with mitral valve reconstruction.
文末算例表明，渐缩间隙模型的环隙漏失量比平行平板模型的环隙漏失量小得多。
Calculations show that the annular clearance leakage by the mode of gradually reducing clearance is much less than that by the mode of equidimension clearance.
目的：探讨全喉切除发音重建中切断环咽肌与一侧咽缩肌对发音的影响。
Objective: To study the influence of amputating cricopharyngeal muscle and unilateral pharyngeal constrictor after total laryngectomy on vocal restoration.
方法：将传统双环法缩乳术加以技术改进，使内外环的设计定位合理、简单。
Methods Improved the traditional round block technique reduction mammaplasty to make the design of internal and external ring more reasonable and simple.
以蛋氨酸为原料经还原脱硫甲基化、酯化、氨解、酰胺化及分子内缩和成环4步反应合成得到了左乙拉西坦，总收率44.6%。
Levetiracetam was prepared from L-methionine via reduction-dethiomethylation, esterification, ammonolysis, amidation and intramolecular cyclocondensation reaction with 44.6% overall yield.
本发明还涉及分离的环己缩酚肽合成酶和编码该 环己缩酚肽合成酶的分离的核酸序列。
The present invention also relates to isolated cyclohexadepsipeptide synthetases and isolated nucleic acid sequences encoding the cyclohexadepsipeptide synthetases.
上述截面的管子可经抛光、涂层、弯曲、攻丝、钻孔、缩腰、胀口、成锥形或装法兰、颈圈或套环。
Tubes and pipes of the foregoing cross-sections may be polished, coated, bent, threaded, drilled, waisted, expanded, cone-shaped or fitted with flanges, collars or rings.
本发明进一步涉及由该环己缩酚肽合成酶产生的环己缩酚肽。
The present invention further relates to cyclohexadepsipeptides produced by the cyclohexadepsipeptide synthetases.
本发明进一步涉及由该环己缩酚肽合成酶产生的环己缩酚肽。
The present invention further relates to cyclohexadepsipeptides produced by the cyclohexadepsipeptide synthetases.
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