诱变

Based on the data of seeding rate and root growth,it is concluded that the semi-lethal radiation dose of Platanus acerifolia Willd.dry seed was 50Gy,and the suitable dose range for radiation breeding was 50 to 250Gy.

通过对悬铃木辐射组与对照组成苗率和根长进行比较，初步推测悬铃木辐射的半致死剂量为50Gy，辐照诱变的适宜剂量为50至250Gy。

The podophyllotoxin output of the mutant strain was very steady after cultured by seven times, so as to be used in the industrialization production.

诱变后的菌株经7次传代，产量较稳定，可用于工业化生产。

The rate of micronucleus of the red blood cells with polychromasia and the rate of chromosome aberration was used as the guideline of DNA damage.

本次遗传毒理实验以绞股蓝为材料，以明矾为诱变剂，以小白鼠骨髓嗜多染红细胞的微核率和染色体畸变率作为DNA损伤的指标。

Autotetraploid rice IR36-4X was treated with ion implantation of low energy nitrogen ion beams and a polyembryonic seedling mutant IR36-Shuang was identified in M2 generation.

以低能氮离子束为诱变源，对同源四倍体水稻品系&IR36-4X&进行离子注入，在其第2代群体内筛选得到了1株具有多胚苗性状特征的突变株（IR36-双）。

In the present study, the autotetraploid rice IR36-4X was treated with ion implantation technique by nitrogen ion beams and a polyembryonic seedling mutant (named as the IR36-Shuang) was identified in M2 generation. The mutant line was systematically investigated about the location of seedling in polyembryonic seedling, and the cytological initiation of the additional embryo in the 1R36-Shuang was observed and determined.

以低能氮离子束为诱变源，通过对同源四倍体水稻品系&IR36-4X&进行离子注入后在其第2代群体内筛选得到了1株具有多胚苗性状特征的突变株（IR36-双），对该突变株后代的多胚苗形态特征及其多胚来源进行了研究。

Ion implantation ; Protopectinase ; Mutation ; Screening ; Breeding ; Fermentation process

离子注入；原果胶酶；诱变；筛选；育种；发酵

XZ-131, the Strain Z-25 , which yields high activity protopectinase, was screened out.

经筛选确定高产诱变菌株Z-25，经传代培养，高产性状稳定遗传。

Result proves that ultrasound frequency is higher in the same time, lethality rate increases with the increase of radialization time on the same frequency, at the same time, its physiological character changes.

试验结果表明，在相同的时间内，超声波频率越高对试验菌株的致死率越高；同一频率，超声波辐射时间增加也可使试验菌株的致死率增高，同时经过诱变处理后的菌株其生理生化特性也有变化

The current studies focus on the hot aspect that A. niger is screened from the nature to gain a new-type strain via biotechnology, e.g. ultraviolet radialization, laser irradiation, microwave radiation, plasmogamy and gene transfer et al. The contents as follows were presented in this paper.

目前研究的热点是通过生物技术方法有目的地改造从自然界分离筛选到的黑曲霉，以获得新型菌株，如用紫外线照射诱变、激光辐射、微波辐射、原生质融合和基因转化技术等来研制开发新型黑曲霉菌株。

Because of high reproductivity andtransparent embryos, zebrafish becomes the best vertebrate for mutagenesis.

由于具有产卵量大，胚胎透明易于观察等优点，斑马鱼成为脊椎动物中最好的诱变材料。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。