突变形成

For example, when passing at low altitude supersonic aircraft, when the head and tail of the aircraft will have the pressure and density of mutations through the surface formed after the N-shaped shock wave reflection, reached the ground sounds like explosions, this special sound of noise is called the H -.

例如，当超声速飞机在低空掠过时，在飞机头部和尾部会产生压力和密度突变，经地面反射后形成N形冲击波，传到地面时听起来像爆炸声，这种特殊的噪声叫做轰声。

After selection of 7 days,some HB214 cells with F' factor from GM133 cells and lac+ mutation were observed,but these cells failed to form the colonies which can be seen by the naked-eye.

在培养了7d的选择平板上添加含链霉素的M9选择培养基，2d 后也观察到大量发生lac+突变但没有形成肉眼可见菌落的营养收集细胞。

It was observed that their transposon insertion sites were at different positions of the mas gene.

海分枝杆菌mas突变株在巨噬细胞内增殖能力减弱；其对斑马鱼的致死能力急剧下降，在斑马鱼体内不能形成肉芽肿并很快被清除。

In order to study themolecular and regulation mechanism deeply, in this study, based on constructing suitableNILs of total RNA pools of opposite maize and mutual maize, singleendonuclease digestion cDNA-AFLP technology was applied to screen , isolation andbioinformatics analyze the gene differentially expressed fragments related to the oppos...

为了深入地研究这一珍贵突变材料形成的分子机理和调控机制，本研究中，通过构建合适的玉米对生、互生近等基因系总 RNA池，采用改进的单酶切cDNA-AFLP 技术，对扩增的玉米对生性状相关基因的差异表达片段进行筛选、分离和生物信息学分析。

Null mutant Δmnh6 produced appeared offwhite hyphae, showed reduction in growth, conidiation and appressorium formation, and also showed reduction in appressorium turgor pressure. And the hyphae were more readily wettable by a solution containing SDS and EDTA and more easily digested by fungal cell-wall-digesting enzymes. The appressoria produced by Δmnh6 mutants showed diminished host penetration and the infectious hyphae of Δmnh6 mutants showed reduced in planta growth. Targeted deletion of mnh6 resulted in the greatly reduced virulence capacity to barley and rice CO39 in infection assays.

突变子Δmnh6的菌落形态不同于野生型GUY11，菌落呈灰白色，菌丝稀疏，生长速度变慢，产孢菌丝细胞壁的溶剂疏水性消失，菌丝细胞壁容易被细胞壁降解酶降解，产孢减少，孢子形态变得细长，孢子的附着胞形成率降低，附着胞的膨压降低，附着胞对寄主植物表面的穿透能力减弱，侵入后生长速度减慢，喷雾接种后对大麦和水稻CO39的致病性消失。mnh6基因重新引入Δmnh6后，突变子的表型恢复。

Healing of the blisters is always without scarring and no milia formation. There are focal keratoderma in her plantar.

研究证明，表达于基底层角质形成细胞浆中的角蛋白5或角蛋白14发生突变是引起EBS的根本原因。

According to existing results, it is generally thought that during the Neoproterozoic Earth had experienced several most severe global glaciations in Earth's history.

根据现有的研究结果，地球在新元古代时期确实经历了数次地球历史上最为严重的全球性冰川期，但地球是否被完全冰封还需要更充分的古地质和古生物方面的证据来证明；利用气候模式对各种可能的外部强迫的模拟试验表明&冰雪地球&是很难形成的，并且，如果地球进入完全被冰封的状态，它将是难以被融化的；关于新元古代时期剧烈的气候变化对寒武纪生命大爆发所起的作用存在2种观点，一种认为气候变化导致了原始生命的基因突变并诱发了寒武纪生命爆发，另一种认为这种影响主要是生态方面的。

Catechin, thearubigins, and theaflavins of Tibetan tea, and products of their oxidation, degradation and complexity, contain important elements to prevent cancer, and reduce cancer and mutation so as to maintain a strong ability to kill cancer cells. The tea is also noted to prevent forms of carcinogenic nitroso compound, and restrain some enzyme that could activate carcinogen. Tibetan tea is rich in many materials, such ascatechin,β-carotene, vitamin

防癌、抗癌藏茶中茶红素、茶黄素、儿茶素以及其氧化、降解、络合产物都是重要的防癌、抗癌、抗突变的成分，有很强的杀灭癌细胞的作用；对人体致癌性亚硝基化合物的形成具有阻断功效，能抑制某些能活化致癌原的酶系；藏茶富含的多种物质，如儿茶素、β—胡萝卜素、维生素B1、B2、C、E等都有抗癌的作用。

Study shows that strengthening body resistance and archaeus herbs have many effects,such as improving and adjusting immunity function,protecting bone marrow,improving haematogenesis function,raising digest and absorb function,improving substance metabolism,preventing gene mutation,inhibiting tumor cell proliferation,inducing tumor cell differentiation or apoptosis,resisting tumor invasion and metastasis,inhibiting formation of tumor vessel and activity of telomerase,etc.It's possibly the result of synergistic effect by multi-pathway and multi-target.

研究表明，扶正培本药物具有增强和调节机体免疫功能、保护骨髓及提高机体造血机能、增加消化吸收功能，改善物质代谢、阻止基因突变、抑制肿瘤细胞增殖、诱导分化、促使肿瘤细胞凋亡、抗肿瘤侵袭与转移、抑制肿瘤血管形成及肿瘤细胞端粒酶活性等多种作用，其发挥的扶正作用可能是多途径、多靶点联合协同作用的结果。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。