查询词典 metacentric

The spiny eel , belonging to Perciformes, Osteichthyes, is a kind of little freshwater fish distributed in Southern China. In 1998, Our lab detected XX/XY differentiated sex chromosomes in this specie with karyotypic analysis, and then with chromosomal binding and SC observation, we identified that its two largest metacentric chromosomes were X, Y sex chromosomes in 1999. X, Y chromosomes differ each other not only in the distribution of heterochromatin but also in their shapes, which make them could be recognized directly under the light-microscope without any banding treatment.

刺鳅，属鲈形目、刺鳅科(Perciformes，Mastacembelidae)，是广泛分布于中国南方的小型淡水鱼类。1998年，我室通过核型分析，首次发现该物种具有明显分化的异形性染色体，其性别决定类型为XX／XY型。1999年，本室通过染色体显带、精母细胞联会复合体观察，再次确认刺鳅染色体组中最大的一对中部着丝粒染色体为X、Y性染色体，两者不仅已经出现结构异染色质分布上的不同，同时在外部形态上也存在明显差异，识别特征鲜明，在光镜观察下无需显带即能清晰辨认性染色体。

All the chromosomes were composed of metacentric (or sub-metacentric) and telocentric chromosomes.

对于紫胶虫的染色体研究，许多学者进行了相关的探索：Dikshith(1962)对紫胶蚧库斯米

Special wild pig had 6 pairs of metacentric chromosomes and 5 pairs of telocentric chromosomes,which was contrary to domestic pig.

结论特种野猪的核型可能是一些罗伯逊易位个体与正常核型个体间反复杂交，染色体重新组合的结果。

The karyotype contains 12 pairs of metacentric, 3 pairs of submetacentirc and 4 pairs of subtelocentric chromosomes. There is no telocentric chromosome at all.

绢丝丽蚌的二倍体数目2n=38，核型公式为2n=24m+6sm+8st，NF=68，其中中部染色体12对，亚中部染色体3对，亚端部染色体4对，没有端部染色体。

The karyotype pattern showed that the chromosome number of 2n = 48 contained two metacentric chromosomes, two submetacentric chromosomes, 44 telocentric chromosomes. The karyotype formula is 2 m + 2 st + 44 t and the fundamental number is 52. We will continue to make the karyotype analysis of other tunas in the future.

结果显示其染色体数为2 n = 48，其中2条为中央中结染色体，2条为近中央中结染色体，44条为端点中结染色体，核型公式为2 m + 2 sm + 44 t，染色体总臂数为52，未来将继续进行其它鲔鱼的核型分析。

NO.1 chromosome was submetacentric,NO.2 and Z chromosome were metacentric,and the others were telocentric,which was slightly different from the results of others. Additionally,analysis of G-banding patterns for macrochromosomes indicated that they were divided into 27 zones and 134 bands.

染色体形态分别为：NO.1染色体为sm型，NO.2、Z染色体为m型，其余染色体均为t型，这与前人研究结果存在一定差异。G带分析结果显示，鹌鹑的前9对大染色体及Z、W染色体G带可分为27个区，134带。

Besides, NO.4, 6, 8, Z chromosome of domestic fowl were submetacentric, submetacentric, metacentric, metacentric, repectively, whereas those of quail were all telocentric.

结果表明，家鸡和鹌鹑染色体数目均为2n=78，但染色体的形态存在明显差异，主要表现在NO.1、NO.4、NO.6、NO.8和Z染色体上。

Thirty six homologous pairs of chromosomes were autosomes , in which chromosomes ,pairs of 1 to 20 were acrocentric-subterminal , 21 to 36 metacentric-submetacentric . And X chromosome was metacentric, Y chromosome terminal.

其中，1～20对常染色体为亚端着丝粒染色体，21～36对常染色体为亚中着丝粒染色体和中着丝粒染色体，X为中着丝粒染色体，Y为端着丝粒染色体。

The chromosome No.1 is Very unstable, and there are three types:(1)M,M(With a double metacentric chromosomes),(2)M, T, T(With single metacentric chromosome).(3)T,T,T,T.

发现第一对常染色体极不稳定，存在(1)M，M；(2)M，T，T；(3)T，T，T，T三种多态类型。

A new method and the principle is presented for plotting the critical metacentric height curve which meets IMOs intact stability criteria and weather criteria,and the critical metacentric height curve which meets 1976 SOLAS intact stability criteria. And the critical metacentric height curve is used in the Stability check of bulk grain carriers in accordance with the stability rules for bulk grain carriers.

本文还具体给出了满足IMO完整稳性和天气衡准的临界初稳性高度的求作方法，以及满足1976 SOLAS公约散装谷物船舶的稳性衡准要求的临界初稳性高度的原理和求作方法，并将由此得到的临界初稳性高度曲线综合运用到散装谷物船舶的稳性校核。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。