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Attenuation The trp operon is also controlled by attenuation A leader sequence in the polycistronic mRNA upsteam of the coding region of the trpE structural gene encodes a 14 amino acid leader peptide including two tryptophan residues The RNA leader sequence can for several possible stem-loop secondary structures,one of which can act as a transcription terminator whilst a different stem-loop can act as an anti-terminator.

弱化作用 trp 操纵子也受到弱化作用的调控。在trpE结构基因编码区上游的多顺反子mRAN上有一段前导序列，可以编码一个含有14个氨基酸的前导肽，此肽中含有两个色氨酸残基。

Endothelin is a vasoconstrictive peptide produced by vascular endothelial cells, which consists of 21 amino acid residues.

内皮素是由内皮细胞产生的，含有21个氨基酸残基的血管收缩肽。

Endothelin-1 (ET-1), a peptide of 21 amino acid residues, is the most potent vasoconstrictive substance known.

概述 内皮素是一种由21个氨基酸组成的活性多肽，为目前已知缩血管活性最强的物质。

In recent years, some pesticides are non-functional on Venturia nashicola because of the emergence of drug-resistant bacteria and chemical residues in the environmental pollution problems.

近年来由于梨黑星病菌抗药性的产生及药剂残留量对环境污染问题等使一些药物对梨黑星病菌的防治效果明显下降。

The detected rate and the violative rate of organophosphorous and organochlorine residues in grains 、vegetable and fruit are lower.

粮食、蔬菜、水果中有机磷农药和有机氯农药的检出率和超标率均较低。

The FQPA provided for an additional authorization of $12 million for increased FDA monitoring for the years 1997 to 1999 and established substantial civil penalties for introducing foods with violative pesticide residues into interstate commerce.

在1997年至1999年间，为解决食品药品署扩大的业务， FQPA 拔了额外的1200万美元的款项并建立了对将具有农药残余的食品引入商业领域的行为实施物质处罚。

The detected rate and the violative rate of organophosphorous and organochlorine residues in grains 、vegetable and fruit are lower.conclusion some local food in renhua , such as grains and vegetable ,have been contaminated by lead and cadmium .

仁化本地生产的粮食、蔬菜等食物不同程度地存在铅、镉污染问题，应进一步开展铅、镉污染的相关研究工作。

The amino acid compositions of the coat proteins of the 6 isolates were found to be very siwhar each other and similar to the Vulgare strain, althonh minor dihaences ekisted in the amount of certain amino residues.

因而它们有很强的同源性。经病毒粒体外壳蛋白的氨基酸分析，在氨基酸总数上，分离物GD1和GD3各有156个氨基酸。GD2和GD4各有159个，GD5和GD6分别有158和157个氨基酸。

The Cd2+ residues in Zizania galls in all treatments were lower than the national maximum residue standards of non2polluted vegetables.

表明茭白对Cd2+的忍耐性较强，虽然产品器官中的残留含量随处理时间延长而呈增加趋势，但生物富集程度较低。

The changes of some morphological, physiological and biochemical indexes of the Zizania plant and the Pb2+ residues in Zizania galls were investigated. The results showed that contents of soluble protein, protective enzyme activities, area and chlorophyll content of functional leaves and net photosynthetic rate ascended under low concentration of Pb2+ treatment and descended along with the increase of Pb2+ concentrations, while the content of proline ascended all along.

在不同栽培介质中对重金属Pb2+胁迫的反应，以茭白的单季茭品种'蒋墅茭'和双季茭品种'葑红早'为试材，采用苇末基质和土壤两种栽培介质进行不同浓度Pb2+的胁迫处理，测定了其生长过程中部分形态、生理指标及其产品器官中Pb2+残留含量的变化。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。