诱变

Fenugreek ( Trigonella foenum-graecum L.) seeds which introduced from United Arab Emirates were carried to the space by the recoverable satellite "Shi Jian 8". After space loading, the seeds were planted to be observe and investigated compared to the control group. The results showed that the germination rate declined after space loading compared to the control group.

以阿联酋胡芦巴种质为材料，经&实践八号&返回式卫星搭载进行空间诱变，回收后，与留地面未经搭载的对照在相同环境下同时播种，对诱变后代（SP1代）的主要农艺性状和品质性状进行研究。

On the discussion about mechanism of mutation of methylating, we explored thermodynamics and dynamic properties on base pairs, investigating the proton transfer on base pairs.

从甲基化对嘌呤碱基电荷的影响，到甲基化引起碱基配对的改变造成碱基配对的诱变等都作了较为详细的探讨；在对甲基化诱变的探讨中，我们进行了热力学和动力学方面的研究，同时对碱基之间的质子迁移的难易程度也作了探讨；并在充分考虑水分子存在的情况下研究了甲基化对碱基之间的氢键作用和堆积作用的影响。

The results show that the suitable material for treatment is the bulb basal plate tissue with a thin part of scales after having been inoculated for 7 days,and regeneration dose is 50～60Gy,the optimum treatment dose for breading is 15～20Gy.In the small bulbs treated with 15Gy and 20 Gy,two mutants were selected,one is shorter with more leaves,the other expands faster.

结果表明，接种7D的外植体更适合作为水仙离体诱变的材料，其不分化剂量为50~60GY，半剂量为15~20GY，在10和15GY处理中，发现了两种小鳞茎突变类型，一种为叶片数增多的矮化突变体，一种为试管小球茎膨大速度加快，所以适宜辐射诱变的剂量为10~20GY。

The results show that die suitable material for treatment is the bulb basal plate tissue with a thin part of scales after having been inoculated for 7 days, and regeneration dose is 50~60Gy, the optimum treatment dose for heading is 15~20Gy. In the small bulls tinted with l5Gy and 20Gy, two mutants were selected, one is shorter with more leaves, the other expands faster.

结果表明，接种7d的外植体更适合作为水仙离体诱变的材料，其不分化剂量为50~60Gy，半剂量为15~20Gy，在10和15Gy处理中，发现了两种小鳞茎突变类型，一种为叶片数增多的矮化突变体，一种为试管小球茎膨大速度加快，所以适宜辐射诱变的剂量为10~20Gy。

There are a ariety of methods for producing gene knockouts in different model organisms.

使基因发生突变方面的实验，到目前为止我只做过紫外线诱变和亚硝基胍诱变。

The seeds of different varieties of mat rush were treated by 60Co γ-rays irradiation of 500, 1000, 1500 and 2000Gy. The seedlings cultured from treated seeds were used to detect the root activity, seedling growth, chlorophyll content, activities of polyphenol oxidase and catalase, and to investigate the effect of irradiation treatment on the physiological and biochemical properties of mat rush.

分别以500、1000、1500和2000Gy的60Coγ射线处理不同蔺草品种成熟干种子，并将其培养成实生苗，进行根系活力、叶绿素含量及多酚氧化酶和过氧化氢酶活性的检测，观察蔺草苗期的生长状况，从而研究不同辐照剂量对蔺草苗期生长及生理生化特性的影响，确定蔺草的适宜辐照诱变剂量，为下一步开展蔺草品种诱变改良奠定基础。

The rate of abnormal karyotype among those cases with history of mutagen contact are higher than those without contact history.

有诱变剂接触史者染色体畸变率高于无诱变剂接触史者，主要累及7、8、9号染色体。

The role of inhibition mutagenesis: an important mechanism for tumors to generate one cell mutagen in the role of the outside world under the gene mutation, and lycopene can block this process, play a role in cancer.

抑制诱变作用：肿瘤生成的重要机制之一是组织细胞在外界诱变剂的作用下发生基因突变，而番茄红素能阻断这个过程，发挥抗癌作用。

The effect of the two mutagenesis to the rate constant of the two microalage cell and the EPA and DHA cotents in the two miroalage cells proved that EMS was the better mutagen.

比较这两种诱变方法对海洋微藻的生长繁殖速度和脂肪酸含量的影响，结果证明采用化学诱变的处理方法更好。

A transposon mutagenesis system applicable for Xanthomonas campestrispv.campestrishas been developed by transferring the transposonTn5gusA5,which contains the gus reporter gene,to the broad host rangvector pLAFR1 and taking the advantage of incompatibility between pLAFR1and pPH1JI plasmids.Five different types of exopolysaccharidedeficient mutants related respectively to eight different mutated sites wereisolated by applying the system to mutagenize the Xcc wild type strain.

本研究将含gus报告基因的转座子Tn5gusA5转座到广谱宿主载体质粒pLAFR1后，利用pLAFR1与pPH1JI质粒的不相容性，建立了一套适合于甘蓝黑腐病菌的转座子诱变体系，应用该体系诱变甘蓝黑腐病菌野生型菌株，成功地分离到5种不同类型、分别涉及8个不同突变位点的胞外多糖突变体。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷