前体

qián tǐ
  • precursor;forebody;prosoma
前体前体
前体 [qián tǐ]
  • (1) [forebody]∶船的最宽大部分或船中部横剖面以前的部分

  • (2) [prosoma]∶各种无脊椎动物(如许多软体动物)的身体前方部分,当它不能被分解成原始体节时

  • (3) [precursor]

  • (4) 反应或过程的预前阶段中所存在的或所形成的一种物质,后来会转变为另一物质或体系

  • (5) 在代谢途径中位于另一化合物之前的一种化合物

前体[qián tǐ]
  1. 小细胞肺癌是神经内分泌肿瘤,起源于apud(胺前体摄取脱羧化)细胞。

    Small cell lung cancer is neuroendocrine neoplasm and origins from apud ( amine precursor uptake decarboxylation ) cell .

  2. 外来供给的天门冬氨酸,在植物组织中并不是一个活跃的天门冬酰胺前体。

    Exogenously supplied aspartate is not an active precursor of asparagine in plant tissues .

  3. 可见巨核细胞,红细胞岛和粒细胞前体细胞

    Note the presence of megakaryocytes , erythroid islands , and granulocytic precursors .

  4. N1-羧酰-5-氟脲嘧啶系列前体药物的合成

    Synthesis of prodrugs of n_1 alkyl 5 fluorouracil derivatives

  5. β淀粉样肽前体蛋白N端328-332(APP5肽)类似物神经营养作用的体外实验研究

    The in vitro experimental research on neurotrophic effect of the analogs of APP 5-mer peptide

  6. 前列腺素E1前体&全顺式-8,11,14-廿碳三烯酸的合成

    The synthesis of pge_1 precursor & all cis-8,11,14-eicosatrienoic acid

  7. 血钠尿肽前体N末端在心力衰竭时的变化

    Changes of blood N-terminal fragment of brain natriuretic peptide prohormone in patients with chronic heart failure

  8. 小干扰RNA对人淀粉样前体蛋白基因的沉默作用

    Silencing effect of amyloid precursor protein triggered by small interfering RNA

  9. 手性药物前体R(-)-扁桃酸的生物不对称合成

    Study on Asymmetric Synthesis of Chiral Precursor R ( - ) - mandelic Acid Chiral Compounds

  10. 保护剂对K2PtCl6为前体合成纳米铂形状的影响

    Impact of Protector Molecules on the Shape of Pt Nanocrystals Synthesized with K_2PtCl_6 as the Precursor

  11. 此外,还克隆到该神经毒素缺失前体cDNA。

    Furthermore , the cDNA encoding the deletion precursor of α bungarotoxin was also cloned .

  12. IL-1对β-淀粉样前体蛋白基因在人神经母细胞瘤株中表达的调节作用

    The Effect of IL-1 on Regulation of APP Gene Expression in Neuronal Cell

  13. 人神经母细胞瘤株中β-淀粉样前体蛋白基因IL-1反应元件的研究

    The Research of IL-1 Responsive Element of APP Gene Promoter in Neuronal cell

  14. 内皮祖细胞(endothelialprogenitorcells,EPCs)是一类具有高增殖潜能的前体细胞。

    Endothelial progenitor cells ( EPCs ) is a kind of high potential proliferation of the progenitor cells .

  15. 采用MTT比色法、流式细胞术分别检测大黄素和大黄酸作用下,前体脂肪细胞增殖力、细胞周期的变化以及细胞凋亡情况。

    MTT spectrophotometry and cell cycle was assayed by FCM ( flow cytometry ) was adopted .

  16. 目的:TNFα可以分泌型(sTNF)及其前体膜型(MTNF)两种活性形式同时存在于体内。

    Objective : TNF α exists as both transmembrane form ( M TNF ) and secretory form ( S TNF ) .

  17. Bcl-X基因前体mRNA选择性剪接调控研究

    The Regulation of the Alternative Splicing of Bcl-X Pre - mRNA

  18. Ni/MgO/Al2O3催化剂中Ni前体对甲烷-二氧化碳重整反应活性的影响

    Effect of Nickel Precursor on the Catalytic Activity in Carbon Dioxide Reforming of Methane on Ni / MgO / Al_2O_3 Catalysts

  19. BMP是通过大的前体蛋白合成的。

    BMPs are synthesized as large precursor proteins .

  20. 其次,发现了毕赤酵母表达的胰岛素前体N末端的不均一性现象并分析了原因。

    The heterogeneity phenomenon on the N-terminal of insulin precursor produced by Pichia pastoris was found . The phenomenon was presumed to be caused by the following reasons .

  21. NMDA促进寡突胶质前体细胞迁移的研究

    Study on NMDA Stimulates Migration of Oligodendrocyte Precursor Cells

  22. 制备溶液pH对CuO-ZnO/Al2O3催化剂前体物相及其CO水汽变换反应活性的影响

    Influence of Precipitation pH on Phase Composition of Catalyst ( CuO-ZnO / Al_2O_3 ) Precursors and Activity of Catalyst in CO Water Gas Reaction

  23. 电子束CT确诊的冠状动脉粥样硬化与血浆N末端脑利钠肽前体水平的关系:基于多民族人群样本的研究(达拉斯心脏研究)

    Relation of coronary atherosclerosis determined by electron beam computed tomography and plasma levels of N-terminal pro-brain natriuretic peptide in a multiethnic population-based sample ( The Dallas Heart Study )

  24. Sertoli细胞对大鼠大脑皮质神经前体细胞的诱导分化作用

    Differentiation of neural precusor cells of rat cortex co-cultured with Sertoli cells

  25. 信使RNA前体可变剪接是真核细胞转录的一个主要特点,但其调控知之甚少。

    Alternative splicing of pre-messenger RNA is a key feature of transcriptome expansion in eukaryotic cells , yet its regulation is poorly understood .

  26. 胚胎干细胞源性视网膜前体细胞在rd鼠视网膜下腔移植后的分化

    Differentiation of embryonic stem cell derived retinal precursor cell after transplanted into subretinal space in rd mouse

  27. 胰岛素样生长因子-1(Insulin-likeGrowthFactor-1,IGF-1)是一种多肽类激素,已证明对前体细胞增殖有促进作用。

    Insulin-like growth factor-1 ( IGF-1 ) is a polypetide hormone that has demonstrated effects on these neural progenitor cells .

  28. 目的观察胚胎干细胞(Embryonicstemcell,ES)诱导的神经前体细胞移植,对小鼠脊髓损伤神经功能恢复的影响。

    Objective To observe the effect of transplantation of embryonic stem cell ( ES ) on neurological functional recovery of injured spinal cord in adult mouse .

  29. 目的:探讨胃动素(Motilin,MTL)前体mRNA基因在甲状腺组织中的表达及序列测定;

    AIM : To research the expression and sequencing of motilin precursor mRNA in human thyroid ;

  30. 真核细胞mRNA前体经过剪接成为成熟的mRNA,而mRNA前体的选择性剪接极大地增加了蛋白质的多样性和基因表达的复杂程度。而内含子内部的组成结构对可变性剪接具有重要的影响。

    Eukaryotic pre-mRNAs are spliced to form mature mRNA . The pre-mRNAs alternative splicing greatly increases the diversity of proteins and the complexity of genes expression .