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分界点
相关语句
  segmentation points
    The important conclusion drawn in this study is that the segmentation points, at which the GC content undergoes relatively dramatic changes, do exit in the human genome.
    我们研究得到的一个重要结论就是在人类基因组中的确存在一些分界点,在这些分界点的前后基因组的GC含量发生了很大的变化。
短句来源
  “分界点”译为未确定词的双语例句
    The boundary between the isochores of Class III and Class II in the MHC sequence has been detected and found to be situated at the position 2,490,368 bp.
    运用本算法识别出MHC序列中isochore Class III 和isochore Class II的分界点位于2,490,368 bp处。
短句来源
    It was concluded that the siderophore biosynthesis is demarcated by 2,3 DHBA biosynthesis, and all steps before 2,3 DHBA synthesis were mediated by chromosome while the other steps were mediated by plasmid.
    研究发现 :在由染色体和质粒共同编码介导的铁载体 Anguibactin的合成途径中 ,其分界点位于 2 ,3 -二羟基苯甲酸合成 ,2 ,3 -二羟基苯甲酸合成之前代谢途径受染色体编码调节 ,之后由质粒编码介导 ;
短句来源
  相似匹配句对
    6. Suggestion.
    6、谈考虑
短句来源
    obscuriabdominis sp. nov. 10. C.
    ; 10.秽蝇C.
短句来源
    The boundary between the isochores of Class III and Class II in the MHC sequence has been detected and found to be situated at the position 2,490,368 bp.
    运用本算法识别出MHC序列中isochore Class III 和isochore Class II的分界位于2,490,368 bp处。
短句来源
    The important conclusion drawn in this study is that the segmentation points, at which the GC content undergoes relatively dramatic changes, do exit in the human genome.
    我们研究得到的一个重要结论就是在人类基因组中的确存在一些分界,在这些分界的前后基因组的GC含量发生了很大的变化。
短句来源
    That is, hepatoytes are composed of light cells and dark cells according to their own electron density of cytoplasm.
    肝细胞分界明显,偶见双核肝细胞;
短句来源
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  segmentation points
Furthermore, they noticed that it is even possible that none of the segmentation points are negative minima.
      
Finally, after all image processing is done, desired features are extracted by using the segmentation points.
      
For each interval Ti consider the segmentation points of Sopt that lie within Ti.
      
Here the lower projection profile cannot reach the touching zone and hence segmentation points cannot be detected by the profiles.
      
It only means that the latter points are less likely as candidate segmentation points.
      
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Wang (2000) and Jin (2000) presented very different arguments regarding the definition for the base of the Lopingian Series. Large samples have been collected from the Guadalupian Lopingian boundary interval in Laibin area, Guangxi, South China and processed at the micropaleontology laboratory at the University of Calgary as an independent test for the boundary position. The results are as follows: 1. no overlap between Jinogondolella and Clarkina species has been found from the samples; 2. the change...

Wang (2000) and Jin (2000) presented very different arguments regarding the definition for the base of the Lopingian Series. Large samples have been collected from the Guadalupian Lopingian boundary interval in Laibin area, Guangxi, South China and processed at the micropaleontology laboratory at the University of Calgary as an independent test for the boundary position. The results are as follows: 1. no overlap between Jinogondolella and Clarkina species has been found from the samples; 2. the change from Jinogondolella granti to Clarkina postbitteri occurs in Bed 115 6i; 3. the FAD of C. postbitteri occurs in the upper part of Bed 115 6i at the Penglaitan section, and 4. this change marks a distinct biotic signature and a major punctuated evolutionary event. It is very likely that this Jinogondolella to Clarkina evolutionary event is triggered or controlled by the lowstand of sea level that marks the Guadalupian Lopingian boundary interval. The lower part of Bed 115 6i is the top of the late Guadalupian sequence where very shallow grainstone carbonate forms the top of the HST or the early LST of the overlying sequence. As the first representative of Clarkina, Clarkina postbitteri is one of the most easily recognized species within the boundary interval, and the Clarkina postbitteri Zone is well established and can be easily and consistently recognized. Clarkina postbitteri and Clarkina dukouensis can be differentiated consistently with a taxonomic system that emphasizes denticulation of the carina, the need to view the entire population and the recognition of ontogenetic changes. The transition between Clarkina postbitteri and Clarkina dukouensis is gradual and the point that Clarkina postbitteri becomes Clarkina dukouensis can only be picked arbitrarily. Such an arbitrary point, if used as the definition for the GSSP, would be very difficult to recognize consistently. Specimens illustrated from Bed 114.6 6k by Wang (2000) as Clarkina dukouensis are here regarded as C. postbitteri , but it is possible that they could be referred to as a new subspecies of C. postbitteri. The first undisputed Clarkina dukouensis occurs in Bed 114 7e at the Penglaitan Section. The FAD of Clarkina postbitteri is the clearest possible boundary position for the Guadalupian Lopingian boundary in terms of biologic evolution and from a sequence stratigraphic perspective.

王成源 (Wang,2 0 0 0 )和金玉 (Jin,2 0 0 0 )提出了关于乐平统底界定义的不同论点。为了对此进行独立的验证 ,卡尔加里大学微体古生物实验室对采自华南广西来宾地区瓜达鲁普统 -乐平统界线地层的牙形类化石大块样品进行了处理。结果如下 :1.Jinogondolella和 Clarkina在样品中没有共生 ;2 .由 Jinogondolella granti演化为Clarkina postbitteri 的变化发生在层 115 - 6 i;3.C.postbitteri 的首次出现层位 (FAD)在蓬莱滩剖面位于层 115 - 6 i上部 ;4.这个变化标志着一个显著的生物信号和一个重要的点断演化事件。Jinogondolella granti演化为 Clarkinapostbitteri的事件很可能是受瓜达鲁普统与乐平统之交的海平面降至最低水位所触发和控制。层 115 - 6 i下部为较浅水相颗粒灰岩 ,代表瓜达鲁普统末期层序高位域之顶或上覆层序低位域之底部。作为 Clarkina属的第一个代表 ,Clarkina postbitteri是界线地层中最易识别的种之一 ,而 Clark...

王成源 (Wang,2 0 0 0 )和金玉 (Jin,2 0 0 0 )提出了关于乐平统底界定义的不同论点。为了对此进行独立的验证 ,卡尔加里大学微体古生物实验室对采自华南广西来宾地区瓜达鲁普统 -乐平统界线地层的牙形类化石大块样品进行了处理。结果如下 :1.Jinogondolella和 Clarkina在样品中没有共生 ;2 .由 Jinogondolella granti演化为Clarkina postbitteri 的变化发生在层 115 - 6 i;3.C.postbitteri 的首次出现层位 (FAD)在蓬莱滩剖面位于层 115 - 6 i上部 ;4.这个变化标志着一个显著的生物信号和一个重要的点断演化事件。Jinogondolella granti演化为 Clarkinapostbitteri的事件很可能是受瓜达鲁普统与乐平统之交的海平面降至最低水位所触发和控制。层 115 - 6 i下部为较浅水相颗粒灰岩 ,代表瓜达鲁普统末期层序高位域之顶或上覆层序低位域之底部。作为 Clarkina属的第一个代表 ,Clarkina postbitteri是界线地层中最易识别的种之一 ,而 Clarkina postbitteri带的识别较容易和稳定一致。Clarkinapostbitteri和 Clarkina dukouensis可以通过基于锯齿型式 ,居群和个体发育的分类体系来加以稳定地区分。Clarki-na p ostbitteri和 Clarkina dukouensis之间的过渡是渐变的 ,其间的分界点只能人为地确定。如果采用这

Objective\ To investigate the prevalence of low body weight or thinness in Beijing pubertal girls and the cut\|off body mass index(BMI)for Chinese pubertal girls. Methods\ Data used for the analyses were drawn from a random sample of 1214 adolescent girls aged 12-13 years from rural and urban areas of Beijing,China,in a nutritional survey in 1995.Variables included age,height,weight,BMI,bone age,menarche,breast and pubic hair development,bone mineral content(BMC),bone mineral density(BMD)and bone width(BW)at...

Objective\ To investigate the prevalence of low body weight or thinness in Beijing pubertal girls and the cut\|off body mass index(BMI)for Chinese pubertal girls. Methods\ Data used for the analyses were drawn from a random sample of 1214 adolescent girls aged 12-13 years from rural and urban areas of Beijing,China,in a nutritional survey in 1995.Variables included age,height,weight,BMI,bone age,menarche,breast and pubic hair development,bone mineral content(BMC),bone mineral density(BMD)and bone width(BW)at distal 1/3 and 1/10 radius and ulna.BMI assessment criteria established by Chinese Ministry of Health and State Education Commission and WHO recommendation on BMI\|for\|age were used. Results\ The low body weight(BMI<18) rate was 32\^2%.Compared with those with normal weight, the girls with low body weight had lower bone age, delayed breast and pubic hair development, lower menarche rate,and lower BMC,BMD and BW at distal 1/3 radius and ulna ( P <0 05).Logistic regression analysis showed that BW,bone age,breast development and BMI were determinants/predictors of BMC of the forearm.When BMI<18,the risk of BMC at 1/3 ulna less than the median was 1\^75 times of that when BMI=18-21. Conclusion\ High prevalence of low body weight was a major nutritional health problem among Beijing pubertal girls.BMI<18 is recommended as the cut\|off value for delayed growth and development as well as at risk of low BMD.Menarche is a useful indicator of nutritional status.Nutritional interventions need to be introduced to girls with low body weight to improve their growth and bone health.\;

目的 调查青春期女孩低体重率并探讨适合我国青春期女孩体重指数 (BMI)的评价标准。方法 对 12 14名北京城乡 12~ 13岁女学生 1995年营养状况调查的样本资料进行分析 ,指标包括年龄、身高、体重、BMI、骨龄、月经初潮、第二性征发育、左前臂远端 1 3和 1 10位点桡尺骨骨矿含量、骨密度、骨宽度。BMI评价采用改良的我国卫生部和国家教委标准及世界卫生组织推荐标准。结果 低体重率 (BMI<18)为 32 2 % ,低体重组比正常体重组生长发育指标明显滞后 ,尺骨远端 1 3位点骨矿含量 (BMC)低于平均水平的危险性增加 (Odds值 1 75 ,95 %可信区间为 1 0 4~ 2 95 ) 75 %。结论 高的低体重率是北京青春期女孩的主要营养健康问题 ,BMI <18可作为生长发育滞后和具有低骨密度危险的分界点 ,月经初潮可作为营养状况的监测指标。对低体重女孩应采取营养等干预措施 ,以促进其生长发育和骨骼健康。

Regulation of siderophore anguibactin biosynthesis was studied by using a mutant from marine Vibrio anguillarum which harbors a pJM1 plasmid. It was concluded that the siderophore biosynthesis is demarcated by 2,3 DHBA biosynthesis, and all steps before 2,3 DHBA synthesis were mediated by chromosome while the other steps were mediated by plasmid. Expression of genes on chromosome for biosynthesis of 2,3 DHBA was induced by environmental ferric ion.

以一株鳗弧菌 p JM1质粒缺陷株为研究对象 ,考察了儿茶酚类铁载体 Anguibactin的合成代谢调控。研究发现 :在由染色体和质粒共同编码介导的铁载体 Anguibactin的合成途径中 ,其分界点位于 2 ,3 -二羟基苯甲酸合成 ,2 ,3 -二羟基苯甲酸合成之前代谢途径受染色体编码调节 ,之后由质粒编码介导 ;编码 2 ,3 -二羟基苯甲酸的染色体相关基因的表达受环境铁离子浓度的诱导调节

 
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