外源物

This is distinct from active immunity in which a person's own immune cells respond to a foreign invader by making antibodies.

这不同于主动免疫──个体自身的免疫细胞通过制造抗体来对抗外源入侵物。

For many years, the main policy to treat eutrophic aqueous systems is to control the exotic import.

多年来人们治理富营养化水体的主要策略是控制外源输入，然而通过此法成功恢复水生生态的例子屈指可数，一个主要的原因就是沉积物中磷的再释放。

The authors consider that is abnormal coagulation in steroid-i nduced necrosis of femoral head,and it might be caused by exogen ous steroid damaged the vascular endotheliod of those intraosseous and extraosse ous;or the platelet and other coagulable active mass be actived by immunocomp lex deposited in the vascular wall.

认为激素性股骨头缺血坏死发病过程中，系统存在异常的凝血状态。这种异常的凝血状态很可能是外源性激素造成了骨内外血管内皮损害或免疫复合物沉积在血管壁，进一步激活了血小板及其它凝血活性物质后引起的。

Apoptosis is a fundamental form of cell death, probably involves in low-dose and chronic poisoning of toxicans.

细胞凋亡是细胞死亡的一种基本形式，可能参与了外源化学物长期低剂量接触的损伤过程。

This paper took the insect-resistant transgenic birch grown in greenhouse for four years as study materials. The genomic DNA and RNA of leaves were extracted and the integration and the expression characteristic of the extraneous genes in the insect-resistant transgenic birch were analysed by methods of multiplex PCR, reverse primer PCR, inverse PCR, RT-PCR, and insect-feeding experiment of the transgenic plants respectively.

本文以温室四年生转抗虫基因白桦为研究材料，提取叶片的基因组DNA和RNA，运用多重PCR，反向引物PCR，反向PCR和RT-PCR等方法，并结合转基因白桦的喂虫实验，分别对转基因白桦外源基因的整合特性和表达特性进行分析，所得结果如下： 1。

Influenced by the exterior source input of the detrital matters, U-series dating using aragonite is not suitable to the study of Lake Sugan sediment and a further study is required.2. The isotopes study of precipitation-groundwater-lake water system in Lake Sugan drainage area indicates that in modern climate system, the precipitation in Lake Sugan drainage area is mainly supplied by the water vapor carried by Westerly.

沉积物文石的铀系测年受到外源碎屑输入的影响，在苏干湖并不适用，需做进一步的研究。2、苏干湖流域降水-地下水-地表径流-湖水同位素系统研究表明，现代气候条件下苏干湖流域大气降水主要来源于西风环流携带的水汽输入。

The structure reveals the catalytic intermediate of DAPDC, in which L-lysine is covalently bonded to PLP to form an external aldimine. This conformation provided the best insight to date on the substrate binding and catalytic mechanism of DAPDC. It also supplied valuable clues for designing specific DAPDC inhibitors.

通过分析我们发现这是DAPDC酶家族的第一个反应中间态结构，即反应产物L-赖氨酸与辅酶PLP共价结合形成了外源醛亚胺的构象，这为了解DADPC的底物结合情况及催化机理提供了迄今为止最详细深入的结构信息，也为针对DAPDC设计特异性抑制剂提供了宝贵的线索。

Molecular cloning and characterization of the novel lection gene. Primers were designed based on conserved sequences of other lectin genes from Amaryllidaceae. A novel lectin gene was isolated from Zephyrathes grandiflora. The full-length cDNA of Zephyrathes grandiflora lectin was 955bp, containing an open reading frame (576bp) encoding a peptide of 191 amino acids. The gene was named as zga (Zephyrathes grandiflora agglutinin), with its encoding protein showing 59% similarity to GNA.

基因克隆及序列分析：根据石蒜科植物凝集素的保守区段，设计引物，采用RACE技术从韭莲中克隆出长度为952bp的新凝集素基因，包含了完整的编码序列(576bp)，它编码一个全长191个氨基酸的蛋白，与雪花莲外源凝集的相似性达59％，被命名为ZGA(Zephyrathes grandiflora agglutinin)。

To explore the effects of exogenous nitrogen input on the enzyme activity of Calamagrostis angustifolia during litter decomposition in a freshwater marsh, we supplied dissolved NH4NO3 (N0:0; N1:6 g·m-2·a-1;N2:12 g·m-2·a-1) to field plots on the Sanjiang Plain and determined the enzyme activities of litter decomposition within 160 d using litter bags.

以三江平原沼泽湿地典型湿地植物小叶章枯落物为研究对象，采用分解袋法研究了不同外源氮输入(N1、 N2分别为 6 、12g·m-2·a-1)对小叶章枯落物分解过程酶活性的影响，并设置对照区（N0，0 g· m-2·a-1）进行比较。

Positive rate was relatively high, and the foreign gene could also maintain in testicular tissue for a long time, it could still be detected in the tissue in 7 months after being injected. However. Deferent results could be gained when the detection were made with different primers on different sites of the recombinant plasmid. This could be explained by transgene lost when the foreign gene recombinated and integrated in heterogenetic cell, or transgene degradated by cell nucleases.

然而，我们也看到，在后代检测中，利用不同的引物扩增重组质粒不同部位时，检测结果存在差异，转基因阳性率不同，这种差异说明当外源基因进入到异源细胞内，在重组整合时发生了外源基因丢失的现象，并由此导致外源基因的整合率下降，也可能是受细胞内核酸酶的作用，使得外源基因遭到降解。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。