precursors

precursors的基本解释

n.

先驱( precursor的名词复数 ), 先行者, 先兆, 初期形式

与precursors相关的网络例句 [注：此内容来源于网络，仅供参考]

Different from the siRNAs or miRNAs, which are derived from double-stranded or short-hairpin RNA precursors, piRNAs are derived from single-stranded RNA precursors or two non-overlapping and divergently transcribed precursors without the involvement of Dicer endonucleases.

与来自于双链RNA的siRNA和发卡结构miRNA不同之处是piRNA来自长单链RNA前体，或者是两股非重叠的反向转录前体，其生成与Dicer无关。

In this exper iment,we took the advantage of RNAi technique,microinjected tinman and singless dsRNA into the early embryos in Drosophila respectively and got these two genes' RNAi phenotypes,which were very similar to that of their mutant,showing heart tube defects or no heart precursors formation.tinman dsRNA eve caused visceral mesoderm defects and the somatic muscles disruption,yet wingless dsRNA only affected heart precursors and had no effect on visceral mesoderm and somatic muscles,indicationg that the heart-related genes dsRNA interference worked effectively and exclusively in Drosophila.

实验运用RNAi技术，分别将tinman和wingless的dsRNA注入果蝇的早期胚胎，得到了这两个基因的dsRNA干扰表型，与两个基因的突变体表型非常相似，都表现为果蝇心脏前体细胞不能形成或心脏管缺失。尤其是tinman基因的dsRNA，还引起了肠中胚层缺失和体壁肌肉组织的紊乱，而wingless基因的dsRNA却只影响心脏的形成，而不影响肠中胚层，说明dsRNA干扰具有非常强的特异性，因而不失为研究果蝇心脏发育基因功能的有效方法。

Precursors of sulfates and alkali halides prepared in co-deposition process were mixed homogenously, annealed at high temperature and then formed CoO and NiO fibers, XRD, XPS, Raman and SEM were used to characterized the samples, the growth of these fibers might be a special LS mechanism: soluble precursors in molten salt decomposed gradually to form initial crystal nucleus and succeeding particles adhered to these nucleus and grew anisotropically in the special high temperature fluent medium, the higher decomposition temperature and solubility of the precursor are two key factors in this method, which are in favor of a longer growth process and result in larger sizes of the final metal oxides crystals.

以共沉淀方法生成硫酸盐与碱金属卤化物融盐的均匀混合前驱物，在高温下退火制备出了CoO和NiO的晶须，以XRD和XPS等对成份进行了分析，SEM分析了形貌特征，研究了不同前驱物热分解特性，认为本方法是一种简单的LS生长机制：可溶性前驱物于融盐中热分解后逐渐析出成核，后续的粒子附着在核上，在融盐环境下沿一定方向作准一维生长，其产物形貌之不同源于硫酸盐的高分解温度和在融盐中的可溶性，导致晶体生长过程中成核过程与生长过程竞争的结果对一般前驱物结果的偏移。

与precursors相关的网络解释 [注：此内容来源于网络，仅供参考]

Precursors：前体细胞

此前一般把各类血细胞的产生过程(造血过程)分为造血干细胞(hemopieticstemcells),定向血原细胞(committedprogenitors,只能成长为某一类型的血细胞,如白细胞或红细胞),前体细胞(precursors)及成熟血细胞等阶段.

Precursors：前体

一个熟练的化学家可轻易的合成大多数的化学毒剂. 对于很多[[恐怖组织]]来说,化学武器是很理想的选择: 便宜,易于获得和运输. 在前体(precursors)供应充足的情况下,一个熟练的化学家可轻易的合成大多数的化学毒剂.

Precursors：前体物

Poxviruses痘病毒 | Precursors前体物 | Prokaryotic cells原核细胞

Precursors：前驱材料,前驱体

precipitators 沉淀器,滤尘器 | precursors 前驱材料,前驱体 | prefabrication 预制

ozone precursors：臭氧化学前体

ozone pollution 臭氧污染 | ozone precursors 臭氧化学前体 | ozone producer 臭氧产生者; 臭氧制造者