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chromosome     
相关语句
  染色体
     Study on the Chromosome and Polyploid Induction in Some Penaeid shrimps
     几种对虾染色体及多倍体诱导研究
短句来源
     Sequence Analysis of the BAC 1365 of Rice Chromosome 4 and Structural and Functional Research on OsALDH1, OsRLK, RPA1
     水稻4号染色体BAC 1365序列测定分析以及水稻ALDH,RLK,PP2A-A基因结构和功能的研究
短句来源
     Scanning and Preliminary Functional Analysis of Nasopharyngeal Carcinoma Related Genes on Chromosome 3p21-22
     染色体3p21-22区域鼻咽癌相关基因的筛选及其功能的初步研究
短句来源
     Roles of Chromosome Acetylation and Deacetylation in Hsp Gene Expression in Drosophila
     果蝇中染色体乙酰化与去乙酰化修饰及其与热休克基因表达的关系
短句来源
     Construction of Microclone Library of the Alien Additional Chromosome of Wheat-Thinopyrum Alien Additional Line TAI-27 and Studies on Disease-resistant Genes
     小冰麦异附加系TAI-27中异附加中间偃麦草染色体文库构建及抗病基因研究
短句来源
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  染色体的
     CHROMOSOME STUDIES ON MOUSE ASCITES UTERINE CERVIX CARCINOMA U_(14)
     小鼠腹水型子宫颈癌U_(14)的染色体的研究
短句来源
     CHROMOSOME NUMBERS OF 2 SPECIES AND 3 VARIETIES OF BRASSICEAE IN CHINA
     中国芸苔族(Brassiceae)2种3变种染色体的观察
短句来源
     EFFECTS OF UDMH,MAPO,HMPA AND BENZENE ON CHROMOSOME IN BONE MARROW CELLS OF RATS
     UDMH MAPO HMPA与苯对大白鼠骨髓细胞染色体的影响
短句来源
     The Immunochemical Difference of Chromosome Between Human and Mouse
     人与小鼠染色体的免疫化学的差异
短句来源
     HETEROMORPHISM OF SOMATIC CELL CHROMOSOMES IN MANKIND:1.CHROMOSOME 1qh~+
     人类体细胞染色体的异态性研究Ⅰ.1qh~+
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  号染色体
     Sequence Analysis of the BAC 1365 of Rice Chromosome 4 and Structural and Functional Research on OsALDH1, OsRLK, RPA1
     水稻4号染色体BAC 1365序列测定分析以及水稻ALDH,RLK,PP2A-A基因结构和功能的研究
短句来源
     The Investigation of Mechanism on Abnormality of Chromosome 21 and Malignant Hematological Disorders
     21号染色体畸变与恶性血液病发生机制的研究
短句来源
     Cloning and Function Analysis of N-RAP and MOB: Two Novel Genes on Chromosome 10q
     人10号染色体长臂上两个新基因——N-RAP和MOB的克隆与功能分析
短句来源
     QTL Mapping on Porcine Chromosome 3, 4 and 7 and Isolation, Identification of Six Candidate Genes
     猪3、4和7号染色体QTL定位及六个候选基因的分离、鉴定
短句来源
     Genetic and Comparative Analysis of Simple Sequence Repeats on Rice Chromosome 4
     水稻基因组第4号染色体简单重复序列的遗传分析及比较基因组学研究
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  染色体上
     Genetic Particularity and Molecular Marker of Phermo-sensitive Male Sterile Gene on T. spelta var.duh. 1BS Chromosome
     T.spelta var.duh.1BS染色体上温度敏感雄性不育基因的遗传特性研究及分子标记
短句来源
     Functional Localization of Metastasis Suppressor Gene for Liver Cancer on Human Chromosome 8 and Relation Studies
     8号染色体上肝癌转移抑制基因的功能性定位及相关研究
短句来源
     Scan of Susceptibility Gene for Familial Essential Hypertension(ESH) on Chromosome 1
     1号染色体上原发性高血压易感基因的筛查
短句来源
     BSD-84 and BED-20 Gene Localization on Human Chromosome by Using in Situ Hybridization
     两种与生育功能有关的蛋白基因BSD-84及BED-20在人染色体上的定位及其在杆状病毒-昆虫体系中的表达
短句来源
     A NEW TECHNIQUE OF USING PROPIONIC-IRON-CARMINE-CHLORAL HYDRATE (PICCH) FOR CHROMOSOME STAINING IN VEGETABLE PLANTS
     在观察蔬菜作物染色体上丙酸-铁-洋红-水合三氯乙醛(PICCH)染色的新技术
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      chromosome
    For the genetics algorithm, chromosome coding, fitness function, parameters selection, and the basic genetics operation including selection, crossover and aberrance, are described.
          
    The result of the molecular mapping of sd-1 gene revealed it is linked to four SSR markers found on chromosome 1.
          
    ms157 Has been mapped to a region of 74kb located in BAC clone T6K22 on chromosome IV using a map-based cloning strategy.
          
    chromosome, and it had no obvious boundary with the ovum envelope and membrane.
          
    The gene is located on Chromosome 6p22.1, and encodes a protein consisting of 402 amino acid residues and containing nine tandem C2H2-type zinc-finger motifs.
          
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    Although most higher plants are hermophroditic, monoecious or dioeoious plants are not infrequently met with in nature. In some cases, plants or organs of one sex possess greater economic value than those of the other sex. Therefore, to change the sex of plants or vary the numbar of either male or female flowers (usually toward the direction of femaleness) is of both theoretical and practical significance.It has long been observed that the sexuality of plants changes with a change of environmental factors. But...

    Although most higher plants are hermophroditic, monoecious or dioeoious plants are not infrequently met with in nature. In some cases, plants or organs of one sex possess greater economic value than those of the other sex. Therefore, to change the sex of plants or vary the numbar of either male or female flowers (usually toward the direction of femaleness) is of both theoretical and practical significance.It has long been observed that the sexuality of plants changes with a change of environmental factors. But those -observed facts received little attention in the past, since they could not be reconciled with the then-prevalent chromosome theory of sex determination. Biologists of the Michurin school believe .that sexuality of plants is but one of the characteristics that the plant exhibits under certain environmental conditions. Thus, like any other characteristic, it is determined by the metabolic conditions of the plants themselves. We are convinced that by changing one or more of the environmental factors, thereby altering the metabolic pattern of the plants, we can successfully control the sexuality of plants for the banefit of mankind.Minina in her monograph has comprehensively reviewed the literature pertinent to the change of sexuality in the plant world under changed enviromental conditions. It has been shown that either treatment with CO, or an alteration of the nutritional status of plants can affect the sex expression of plants.The present investigation purposes to study in greater detail the principles governing the formation of male and female flowers in the cucumber plants.Treatment of the 24-day-old cucumber seedlings with CO gas (at 1%, 0.5% and 0.3%) for 161 hours has remarkably altered the order in which the mala and .female flowers appear. The numbar of female flowers greatly increases, whereas the male flowers do not appear until much later. Marked morphological changes have also been noticed. Physiologically, treated young plants decrease their respiratory activity by 50-70%, as measured at the close of the experimental period. The activity of catalasa has had corresponding changes.When plants are given ample phcspliorus fertilizer successively at the 3-leaf stage, the. stage of bud appearance, and the stage of opening of the female flowers, they bear much more female flowers, whereas the number of male flowers remains unchanged. Plants thus treated also show lower calalase activity hi their leaves.Higher water content of the soil has favored the formation of female flowers. Plants grown under such condition absorb more nitrogen than control plants. This is in line with what is reported in the literature to the effect that high nitrogen is favorable for the development of femaleness.The increase of the number of female flowers is not necessarily connected with the state of the growth of plants. This has led us to believe that it is not the general nutritional status of plants, i.e., the abundance or deficiency of fertilizer, that determines sexuality,The present investigation has clearly demonstrated the possibility that different environmental factors which showed their effect on sex expression may have performed their functions through the same or similar mechanism.The effects of some respiratory inhibitors, including NaN3, malonate, fluoride, etc. are being examined. Investgations are also being undertaken to elucidate the possibility of treatment of seeds with various substances to change the sex ratio of the flowers in the cucumber plants.

    在自然界中不少植物是雌雄异株或雌雄同株而异花的。不同性别的植株或花的经济价值不同,因此,定向改变植物性别的问题就不仅仅具有理论上的意义,而且也有着实践上的意义。很早就有人观察到植物性别可随环境而发生改变的事实;但是这些事实没有受到足够的重视,因为它们与性别决定的染色体学说是不相容的。米丘林生物学者认为植物性别的形成和发展也是植物有机体在一定环境条件下所表现的发育特性之一,是决定于植物体内的新陈代谢的。因此,我们深信,通过环境条件的改变,改变植物体内的新陈代谢过程,从而定向地控制植物的性别是完全可能的。 曾详尽而全面地介绍了定向改变植物性别方面的文献。本文目的在于进一步探讨环境条件对于黄瓜雌雄花出现的规律性的影响以及这些影响的生理实质。 在黄瓜幼苗期间用CO(浓度为1%,0.5%,0.3%)处理植株161小时显著地改变了雌、雄花出现的顺序,增加了雌花的数目,降低了雄花的数目。提高了果实的产量。在外部形态方面亦发生了显著的改变。在生理方面,遭受气体处理的植物在处理结束后呼吸强度降低50—70%,过氧化氢酶的活性也有相应的改变。 在植株三叶期、现蕾期、雌花开放期均施以充足的磷肥,这种处理选择性地增加了雌花的数目,而...

    在自然界中不少植物是雌雄异株或雌雄同株而异花的。不同性别的植株或花的经济价值不同,因此,定向改变植物性别的问题就不仅仅具有理论上的意义,而且也有着实践上的意义。很早就有人观察到植物性别可随环境而发生改变的事实;但是这些事实没有受到足够的重视,因为它们与性别决定的染色体学说是不相容的。米丘林生物学者认为植物性别的形成和发展也是植物有机体在一定环境条件下所表现的发育特性之一,是决定于植物体内的新陈代谢的。因此,我们深信,通过环境条件的改变,改变植物体内的新陈代谢过程,从而定向地控制植物的性别是完全可能的。 曾详尽而全面地介绍了定向改变植物性别方面的文献。本文目的在于进一步探讨环境条件对于黄瓜雌雄花出现的规律性的影响以及这些影响的生理实质。 在黄瓜幼苗期间用CO(浓度为1%,0.5%,0.3%)处理植株161小时显著地改变了雌、雄花出现的顺序,增加了雌花的数目,降低了雄花的数目。提高了果实的产量。在外部形态方面亦发生了显著的改变。在生理方面,遭受气体处理的植物在处理结束后呼吸强度降低50—70%,过氧化氢酶的活性也有相应的改变。 在植株三叶期、现蕾期、雌花开放期均施以充足的磷肥,这种处理选择性地增加了雌花的数目,而对雄花的数目无影响。受到这种处理的植物

    There are two subspecies of migratory locusts in China. One is Locusta migratoria manilensis Meyen, distributing in the east and south-east area, and the other Locusta migratoria migratoria L. in north-west area. The basic chromosome numbers of these two subspecies are all 2n=22+X in male. They both have individuals with supernumerary chromosomes. The behavior of these chromosomes in spermatogenesis has been described.We obtained several hybrid individuals from a cross, Locusta migratoria migratoria...

    There are two subspecies of migratory locusts in China. One is Locusta migratoria manilensis Meyen, distributing in the east and south-east area, and the other Locusta migratoria migratoria L. in north-west area. The basic chromosome numbers of these two subspecies are all 2n=22+X in male. They both have individuals with supernumerary chromosomes. The behavior of these chromosomes in spermatogenesis has been described.We obtained several hybrid individuals from a cross, Locusta migratoria migratoria L.♀×Locusta migratoria manilensis Meyen. The hybrid meiosis has been studied in detail. It is found that it is quite normal with exception of forming occasionally chromatin bridges in anaphase ⅠandⅡ. Several male hybrids, which have been studied cytologically, possess supernumerary chromosomes in addition to normal chromosome complement. These individuals are apparently resulted from an union of gametes with supernumerary chromosomes. The behavior of these supernumerary chromosomes in hybrids during meiosis is similar to that of their parents.In the hybrid, chromatin bridges accompanied with fragments formed by one of the large bivalents have been found in first and second meiotic divisions. These suggest that there is an inversion in one of the large homologous chromosomes of the parental individuals.The isolation mechanism in these two subspecies has been discussed. And we suggest that geographical isolation is one of the most important factors.

    我国的飞蝗在分类学上分为两个亚种,即Locusta migratoria manilensis Meyen和L.m.migratoria L.。这两个亚种的染色体基数均为2n=22+X((?))。在这两个亚种的许多个体中常有超数染色体存在。这些超数染色体在成熟分裂过程中的行为已加以描述。 两个飞蝗亚种的杂种可以在实验室条件下获得。杂种精巢的成熟分裂曾进行观察分析,其分裂过程大多正常进行。杂种个体亦含有超数染色体,这是由于含有超数染色体的配子结合的结果,所以证明至少一部分含有超数染色体的配子是有机能的。杂种的超数染色体在成熟分裂時的行为与亲本的相似。 根据我们所观察的几个杂种个体的成熟分裂,在杂种的染色体结构差別中可能有一逆位区存在。由于逆位双价体发生交換,可以在后期Ⅰ看到形成染色质桥和断片或断片,在后期Ⅱ形成染色质桥等图象。 认为这两个亚种隔离机制中起主要作用的因子之一可能是地理隔离。

    Notre etude cytologique montre trois points importants qui meritent d'etre retenir: 1. L'oeuf d'Attacus ricini est toujours polyspermique: 2--3 spermatozoides pourchaque oeuf. 2. Le nombre du stock haploide est revele 14 sur la premiere mitose polaire, maisla taille des chromosomes est sensiblement differente l'un de l'autre. 3. L'elimination de la plaque intermediaire sur le fuseau de la premiere divisionmaturatrice se fait comme ce qui a ete vue sur l'oeuf d'autres Lepidopteres.

    我们从细胞形态上的研究,证明:蓖麻蚕卵在成熟期分裂的中期(同一横剖面),基组数染色体是14;分作两圈,内层4个,外层10个。成熟卵停止在第一次中期分裂,纺锤体与卵膜垂直,待精子入卵后继续向前分裂,并发现有染色质消散的现象。第二次成熟期分裂结果获得3个极体和1个雌性原核。正常的卵平均能接受2—3条精子,它们入卵后起收缩、囊化成雄性原核;其中一个与雌性原核合并为“双组核”。剩余的过数精核分裂缓慢,终于中心体离纺锤体作异形的分裂。

     
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