变异发生

Their investigation, just published in Cell, suggests it is the result of a change in the role of a single viral gene, called nef .

他们的调查报告发表在《细胞》杂志上，认为这是一个叫做 nef 的单独病毒基因的功能发生变异而导致的结果。

Results Only unstable random mutations happened in 29 sites with nonsynonymous vs synonymous mutation ratio of 1.42 during 50 passages in 2 serials without maternal antibodies.

LG1株H9N2在没有抗体的鸡胚的传代过程中，仅发生少数碱基的不稳定随机变异，且多为无义突变。

However, multiple stable nonsynonymous mutations were detected gradually during 50 passages of 4 serials in embryos with maternal antibody to LG1 strain, and the NS/S ratio was as high as 3.46 among 45 mutated sites.

在2 个传代系列的10 个代次病毒，共出现了29 个位点变异，有义突变与无义突变比值NS/S为1.42 。但在有抗体的鸡胚的传代过程中，发生了多个呈现稳定遗传的有义突变。

The above view of isomerization between the structure of olefine alcohol and olefine ketone can succeed to explain that the structure and properties of C〓 Fullerols change with the pH value of its solution.

作者提出的上述富勒醇的结构以及烯醇与烯酮的互变异构的观点能成功地解释C〓、C〓富勒醇的结构随其溶液pH值的变化而发生变化的现象。

Variations of this theory may be seen in the works of Lucien Levy - Bruhl, who distinguished between a logical and prelogical mentality in analyzing the kind of thinking that takes place through this mode of experience, and the writings of Rudolf Otto, who described the specific religious meaning of this mode of human consciousness.

变异的这一理论可以看到的作品吕西安列维-布留尔，谁区分的逻辑思维和p relogical在分析什麼样的思想发生通过这种模式的经验，以及著作的鲁道夫奥托，谁描述了特定的宗教意义，这种模式的人的意识。

The phenomenon of vitrification could restore significantly after culture 2 or 3 generations in the culture medium without hormone. The differentiation ability of protocorm restored and the state of plant growth was consistent with the formal protocorm. It could continue applying to the manufacture of tissue culture.

玻璃化类原球茎在无植物生长调节剂培养基中经2~3代恢复培养后，数量下降到0.84%，玻璃化现象可得到明显恢复，恢复后的类原球茎的分化能力和植株生长状态与正常类原球茎一致，无变异现象发生，可继续应用于组培生产。

To get from "protoplasmal primordial atomic globule"(as the Gilbert and Sullivan song put it) to sentient upright modern human has required you to mutate new traits over and over in a precisely timely manner for an exceedingly long while.

因为变化的过程是随机的。从细胞质的原始原子颗粒（像吉尔伯特和沙利文歌曲中唱到的那样）到一个有知觉能独立行走的现代人类的转变要求你在相当长的时间内以一种极为精确准时的方式反复的发生变异产生新品质。

The profiles of some silk proteins and isoenzymes were examined by SDS-PAGE. The results showed that there were no revealable changes in the structure proteins and other high expressive protein examined.

5用SDS-PAGE检测了几种丝蛋白质及其同工酶的表型，结果表明高压静电场处理没有引起检查的结构蛋白和其他高表达蛋白发生可检测到的变异。

The main characters of this category are: 1 It possesses clear main axes and lateral branches/sporangial stalks; 2 Sporangia terminate the lateral branches or long stalks; 3 With the distinct dehiscing mechanism, the sporangia have the variation in shape, i. e. reniform, rounded or vertically elongate; 4 Primary xylem is of centrarch maturation; 5 Conducting tracheid is G-type.

该类群包括Hsüa，Renalia，Nothia，Sartilmania和Huia，其主要特征为：1）具有明显的主茎轴及侧出的分枝系／孢子囊柄；2）孢子囊顶生于侧枝上或侧生的长柄上；3）孢子囊性状存在变异，为肾形、圆形或纵向伸长，具明显的开裂机制；4）初生木质部发生顺序为心始式；5）G-型输水管胞。

The thalami were more sensitive to the treatment time than the concentration when EMS was used as a mutagen and 4 h was the proper treatment time under 0.4% EMS.

诱变苗在进行高温筛选时，存活率出现变化、叶色叶型发生变异，表明诱变与筛选是有效的。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。