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。
Bacteria have defences against viruses in the form of chemicals called restriction enzymes, which chop up foreign DNA.
要在一种宿主表达系统中成功表达外源蛋白并获得较高产量，必须要较为全面地了解影响其表达的诸多因素。
Numerous factors that influence heterologous protein production in a certain host system must be observed to gain successful gene expression and even with high yields.
NKT细胞是一种具有混合功能的细胞：它们既能如自然杀伤细胞般杀死入侵微生物，又能如t细胞般与抗原(能激发免疫反应的外源物质)结合。
NKT cells are hybrids: they kill invading microbes, like natural killer immune cells, but they also bind to antigens - foreign substances that trigger an immune response - like T-cells do.
介绍了外源核苷酸作为一种活性物质，对胃肠道的功能、肝脏生长与发育、脂质代谢、动物体免疫系统等具有重要影响。
As a kind of active substance, the exogenous nucleotides can affect the function of stomach and intestines, the development of hepar, the metabolism of lipid and the immune system of creature.
为满足转目的基因的需求，探索一种能够将外源基因转入银杏细胞，并得以稳定表达和遗传的转基因方法以及选择合适的载体。
To meet the demands of gene transfer of an objective gene, a suitable vector should be screened to carry the extraneous objective gene into the callus cell of Ginkgo biloba.
用双波长、差示、一阶导数分光光度法，建立了一种测定外源物体外代谢时一氧化碳(CO)生成量的新方法。
A double wavelength-differential-first order derivative spectrophotometric assay was established to determine carbon monoxide (CO) generation during in vitro metabolism of xenobiotics.
目的利用单克隆抗体代替常规的人、猴免疫血清进行甲型肝炎减毒活疫苗毒种外源因子检查及鉴别试验。
Objective to identify live attenuated hepatitis a (HAV) vaccine virus seed and detect adventitious agents, monoclonal antibody is used to neutralize instead of human and rhesus monkey immune serum.
喷施外源激素是克服种间杂交不亲和性的有效途径。
Spraying GA and NAA are the effective methods to overcome the incompatibility in specific hybridization.
结论：超声介导微泡破裂法促进外源基因的转移是一种比较安全而有效的基因转染方法。
Conclusion: Ultrasound-mediated albumin microbubble or SonoVue microbubble destruction method is a promising strategy for gene delivery.
外源脱落酸则对这三种糖均有促进效果。
一种程序，将外源基因芯片的数据集，基于的常见，数进行比较差异表达基因。
A program that compares heterologous microarray data sets, based on the number of common, differentially expressed genes.
一种程序，将外源基因芯片的数据集，基于的常见，数进行比较差异表达基因。
A program that compares heterologous microarray data sets, based on the number of common, differentially expressed genes.
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