查询词典 mutagen

METHODS Bleomycin-induced mutagen sensitivity was used to measure chromatid breaks of 52 cancer patients and 76 controls.

应用以博莱霉素为诱变剂的敏感性检测方法，检测52例肿瘤患者和76例对照的染色体断裂情况，并对部分样本进行G显带。

Chromosome analysis is an important and difficult task in clinical diagnosis, mutagen dosimetry and biological research.

一、引言染色体分析是临床诊断、诱变因素剂量学和生物学研究的一个重要而困难的任务。

Faba root tip was studied through detection of micronucleus technique Both of nitrate (0.08 mol/L) and nitrite (0.80 mmol/L) with low concn of could significantly induce the formation of micronucleus of V. faba root tip (P.01), and showed an obvious dose effect, i.e. the permillage of micronucleus was in linear increase with rising up of mutagen concn within a certain range.

结果］低浓度的硝酸盐(0.08mol/L)、亚硝酸盐(0.80mmol/L)均能显著诱发蚕豆根尖微核的形成(P.01)，并呈现出明显的剂量效应，即微核千分率在一定范围内随诱变剂浓度的增加而线性增加。

Pingyangmycin as、a mutagen was applied to crop mutational breeding in this experiment. The mutagenic effects of PYM on barley was studied by means of seed treatment.

本试验以平阳霉素为诱变剂处理大麦种子，研究了该诱变剂对大麦的诱变效应及其适宜的浓度。

In the present experiment, the screening techniques for salt tolerance and mutants of strawberry leaf and anther callus in vitro were studied, and primary screening system for salt tolerance evaluation was established. It was studied the sensitivity to mutagen of different strawberry cultivars and different tissues in vitro.

本试验以草莓离体叶片及花药愈伤组织为试材进行了耐盐突变体的诱变及筛选研究，初步建立了草莓耐盐突变体诱变筛选的技术体系，研究了草莓品种以及离体组织对诱变剂的敏感性，并且对不同诱变处理再生植株的耐盐性差异进行了比较。

Four adduct compounds are found for the former, and three are found for the latter. This indicates the DNA adduct formation capabilities both of 2-chloro benzamide and the photoproduct sample. Meanwhile the result of Ames experiments of them is positive. Thus we should pay more attention to important meaning of these results since the compound, which can produce adducts with DNA, may possibly be tumorigen or even carcinogen and mutagen.

结果表明，前者与DNA反应形成四个可辨认的加合物斑点，后者与DNA反应形成三个可辨认的加合物斑点，能与DNA加合的物质为潜在的&三致&物质，同时，二者的Ames试验结果显阳性这应当引起人们对灭幼脲环境安全性的重视。

60Co-γray was a useful mutagen in induced mutation breeding .After treated with 60Co-γray ,free-living conchocelis of wild Porphyra haitanensis were induced and represented in offsprings. Purple mutant and excellent practical characters strains were selected from a lot of gametophytic blades. Single cell clone and enzymolysis were used to propagate fast in pure strains of induced mutations.

坛紫菜野生丝状体经一定剂量60Co-γ射线辐照后，子代叶状体发生了变异，经大量培养后筛选出紫色突变体（3号Ⅰ）和经济性状优良的个体（7号Ⅰ和7号Ⅱ），通过体细胞酶解和单克隆技术快速获得诱变选育纯系，并对其主要经济性状进行了研究。

Insertional mutagenesis is a method for identifying genes by using the integration of DNA as the mutagen,thereby facilitating the cloning of the mutated gene.

插入突变是一种通过外源DNA整合的方式来获得突变体，并克隆得到对应突变基因的方法。

The mutagen mechanism is presumed single factor dominant.(4)There was 85 percent transvertion in mutagen spectra, and they were all G:C→T:A transvertion. The maximal possibility of mutagen mechanism is analyzed as followed:ion beam implant → breakage cell surface and enter the interior → stimulate plentiful radical born → radical oxidize and damnify DNA → G becomes 8—oxoG → 8—oxoG pairing A → result in G:C→T:A transvertion(5)Production of transition was presumed that ion beam implantion damnified DNA, stimulate activity of MMR interveniented by methyl reducing.

诱发突变谱中碱基颠换比例是0.85，且是全部G：C→T：A颠换，推测低能离子束诱变鼠伤寒沙门氏菌得分子机制可能为：离子注入→通过破坏细胞表面进入内部→刺激产生大量自由基→自由基氧化损伤DNA→G变成8氧—7，8—二氢鸟嘌呤(8—oxoG)→8—oxoG与A配对→导致G：C→T：A颠换。

The same mutagen in the same concentration could increase the ratio of mutagen to PLB with the extended time.

同浓度的同种诱变剂随处理时间的增加材料的变异程度有增大趋势，但不很显著。

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。