查询词典 precursors

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。

Expression of this gene is more efficient, because the enzyme catalyses the three chain elongation reactions starting from the C5 precursors to the C20 molecule.One way to increase the heterologous production is to increase the pool of precursors in the host.

表达这种基因是更有效率的，因为酶催化的三个链伸长反应，从碳五前兆向c20 molecule.one方式，以增加外源生产，是增加池体在东道国。

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。

Sulfide precursors were synthesized by conventional inorganic metal salts and a sulfurizing agent. Sulfide catalysts were prepared by isochoric impregnation using an impregnation solution containing sulfide precursors and a dispersion additive.

以常规金属无机盐及硫化剂为原料合成硫化物前驱体，在硫化物前驱体溶液中加入添加剂配成浸渍液，浸渍载体制成硫化型加氢催化剂。

In this paper, some methods of fuzzy mathematics suah as the direct method of fuzzy pattern recognition, the method of fuzzy clustering analysis the method of fuzzy information retrieval, and the recently advanced method of fuzzy fractal dimension have been applied to earthquake monitoring and prediction in the Surrounding Capital Area based on the seismicity and earthquake precursors. The seismic and unseismic precursors before both the Tangshan M=7.8 great earthquake in July, 1976 and the Datong-yanggao M...

本文把模糊数学中的模糊模式识别的直接方法、模糊聚类分析方法、模糊信息检索方法和新近提出的模糊分维方法应用到以地震活动性和地震前兆为基础的首都圈地震监测预报当中，分析研究了发生在这一地区的两次大地震，即1976年唐山7.8级和1989年大同6.1级地震前用模糊数学方法识别出的地震学前兆和非地震学前兆，并对这一地区大地震的长期和中短期模糊预报方法与途径进行了简要的讨论。

Alkylbenzene, normal alkanes and alkylcyclohexane on the pyrolysates of P. Boryanum at 300℃ had uniform distribution and the relative content of them was similar, indicating that they originated from same precursors. Fatty acids, alcohol and ketone in algal cell are the possible precursors. For example, the precursor of relatively abundant C〓 alkylbenzene and alkylbenzene with C〓 side chain perhaps related with palmitic acid. N-alkylnaphthalene in pyrolysates at 300℃ probably derived from alkylation of cleavage products of aromatic steranes and terpanes.

在盘星藻300℃热解产物中，烷基苯、正烷烃和烷基环己烷碳数分布一致、各化合物的相对含量接近，表明它们有相同的来源，藻类体内的脂肪酸、醇和酮及细胞壁等物质可能是其母质，相对含量较高的碳数为16及侧链碳数为16的烷基苯类化合物，其前身物可能与软脂酸有关。300℃热解产物中的正烷基萘类化合物，可能由芳香甾、萜类的降解产物与直链烃类加成烷基化而形成。

Axonal degeneration similar to that observed in KIF 1A mutants has also been reported for several neurodegenerative diseases such as senile dementia and most recently Charcot-Marie-Tooth disease type 2A by another synaptic vesicle precursors transporter KIF1B knockout mice. In some neurodegenerative diseases, neuronal cell death caused by defects in the transport of synaptic vesicle precursors by KIF1A may be involved.

和KIF1A基因剔除鼠相似的轴突变性在一些神经退行性疾病如老年性痴呆的研究中也有发现，特别是最近，与KIF1A一样运输突触小泡前体的KIF1B基因剔除鼠与Charcot-Marie-Tooth二型疾病的关系，更提示了KIF1A基因的功能缺失，与神经退行性病变及神经元死亡的发生有不可分割的关系。

The largest CoQ10 concentration, which was 90.1% higher than in control was obtained only with added solenesol. When both Side-chain and ubiquinone circle precursors were added, CoQ10 concentration became lower than that of when one of precursors was added.

结果表明，单独添加茄尼醇能达到最大产量33.1mg/L，比对照样品增加了91%，任2种前体物质共同添加都要比单独添加茄尼醇时产量低。

Optimization of precursors and elicitors for taxol production by cell suspension culture of Taxus chinensis;2. The effects of side-chain precursor-Solanesol, ubiquinone cicle precursors-phydroxybenzoic acid, and coenzyme Q_0 on biosynthesis of coenzyme Q_(10) were studied.

首次研究了以辅酶Q10 (CoQ10 )主要侧链供给前体物质———茄尼醇和醌环供给前体———羟基苯甲酸和辅酶Q0 对粟酒裂殖酵母(Schizosaccharomycespromb 2 1794 - 2 3)生产CoQ10 产量的影响，并对前体的转化工艺进行了初步研究。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。