Bacteria have defences against viruses in the form of chemicals called restriction enzymes, which chop up foreign DNA.
细菌有一种对病毒的防御机制：一种叫做限制性内切酶的化学物质可以切断外源dna。
As a cell replicates, the foreign DNA is absorbed and the genes in question are modified by the non-matching short sequences.
当细胞复制时，外来基因被吸收，相关基因被非配对短序列修饰。
Current methods use viruses or chemicals to bring foreign DNA inside cells, but these make permanent changes, which could have their own complications.
当前的方法使用病毒或者化学物质向细胞中引入外来dna，但是这些操作将带来永久性的改变，会引起其特有的并发症。
From this, a new research system-delivery of foreign DNA into microorganism via ion beam - was established, offering a new way to construct genetically engineered microorganism.
由此建立起离子注入介导微生物外源dna转导的研究体系，为微生物转基因工程提供了一条新的途径。
Besides the low efficiency of cloning - just 1.7 per cent of embryos came to term - another challenge to creating transgenic dogs is controlling where in the nuclear DNA a foreign gene lands.
除了低克隆率-只有1.7%的胚胎能存活到最后阶段-创造转基因狗还有一个挑战即如何控制外部基因在核d NA中的植入位置。
Transposons are mobile DNA elements that can integrate into 'foreign' DNA via a 'cut-and-paste' mechanism.
转位子是一种移动的DNA分子，它通过可以通过“剪切和粘贴”机制融入异体的DNA分子。
DNA marking technology provides methods for studying the genetic materials of foreign breed chickens, and it is also the important references for selecting broiler breeds and crossbreeding.
DNA标记技术为探讨外来鸡种的遗传资料提供了手段，对引进品种的选择和如何配套生产有重要的参考价值。
To study the influence of foreign plasmid DNA on spleen metabolism in immune-stimulated mice via the gastrointestinal tract.
研究外源质粒dna经胃肠道途径对免疫激活状态下小鼠脾脏代谢的影响。
Foreign gene (double stranded DNA) is maybe integrated in different DNA strand of the same chromosome as an exon. The first generation of transgenic fish is Mosaic.
外源基因(双链dna)作为外显子可能整合在一条染色体上的不同dna链上，转基因鱼的第一代为嵌合体。
Stitching medical stitch containing plasmid DNA was sewn into Wistar rats' left carotid arteries. The results showed that foreign gene expressed in rats 'vascular wall by this method.
将带有外源性基因的医用缝合线，缝合于大鼠的颈总动脉，实验证明外源性基因可以在血管壁中表达出相应的蛋白质。
Foreign plasmid DNA was cleared from cellular system in short time after intramuscular injection. Foreign plasmid can not integrate into host chromosome genomic in the immunized mice.
肌注外源质粒后，外源质粒在小鼠细胞内逐渐被清除，外源质粒不会整合到宿主染色体上。
CONCLUSION: Foreign plasmid DNA, administered via the gastrointestinal tract, may widely modulate the expression of many genes in the intestine in mice.
结论：外源质粒dna通过胃肠道途径可广泛调控肠道多种基因表达。
CONCLUSION: Foreign plasmid DNA, administered via the gastrointestinal tract, may widely modulate the expression of many genes in the intestine in mice.
结论：外源质粒dna通过胃肠道途径可广泛调控肠道多种基因表达。
应用推荐