分裂核
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Barley seeds were irradiated with five different doses of 60 Co-γ ray.There were many kinds of chromosome aberration in pollen mother cells,such as bridge,laggards in anaphase I and anaphase II,asymmetrical division in anaphase I and asynchronous division in anaphase II,ring quadrivalent in metaphase I,three pole division and micro-nuclei in telophase I,micro-nuclei in tetrad and some micro-nucleus separates from the tetrad to form polyad.
大麦种子经5种不同剂量γ射线辐照后, M1植株的花粉母细胞出现多种染色体畸变类型,例如后Ⅰ、后Ⅱ中出现桥、落后,后Ⅰ中出现不对称分裂,后Ⅱ中出现不同步分裂,中期Ⅰ出现环状四价体,末期Ⅰ中有三极分裂和微核,四分体中出现微核且有的微核独立于四分体,从而形成多分体。
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Some investigations suggested that cyclins and CDK played an important role in the regulation of endomitosis of megakaryocyte. However, the mechanism of cyclins and CDK in the regulation of endomitosis of fetal megakaryocytes during ontogenesis and the relationship between cyclins/CDK and retardation of endomitosis of fetal mgakaryocyte is totally unknown.
一些研究发现周期蛋白和CDK在巨核细胞核内有丝分裂的调控上起重要作用,然而,周期蛋白和 CDK在胎儿巨核细胞核内有丝分裂调控上所起的作用,及其与胎儿巨核细胞核内复制延迟的关系目前全然不知。
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Karyokinesis like: karyokinesis as benign or non-rare, but not as pathological karyokinesis; malignant karyokinesis as often, and can be seen as pathological karyokinesis.
2核分裂像:良性肿瘤核分裂像无或稀少,不见病理核分裂像;恶性肿瘤核分裂像多见,并可见病理核分裂像。
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Nuclear changes in gynogenetic eggs of the scallop were examined under a fluorescence microscope during meiosis and fertilization, indicating that UV-irradiated sperm nucleus did not participate in the karyokinesis at anaphase of the first cleavage.
运用荧光显微镜观察探讨了栉孔扇贝雌核发育卵子在受精和成熟分裂过程中的核相变化,发现UV照射精核不参与核分裂,首次提供了栉孔扇贝雌核发育的细胞学证据。
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Both the new peniculus 1 and the old haplokinety separated at the telophase.The two germinal rows germinal rowsfor both the daughter cells appeared almost at the same time;(2) The macronucleus became shorter and thicker, finally oblate during the division of the cell. Then the macronucleus restored its original shape, band-like form. The micronucleus were divided into two before the macronucleus division;(3) The original scopula and stalk contributed to the old cell. The new cell formed scopula gradually after the cell division.
同时,新仔虫的第一咽膜(P′1)也开始由老单毛基索复制,并在细胞分裂后期与老结构分离;(2)大核在虫体分裂过程中由长带状逐渐缩短变粗至扁圆形,于虫体即将分开时迅速拉长,然后分裂为二个新大核;小核分裂先于大核,在两仔虫口纤毛器即将分开时完成;(3)原帚胚及柄归属老仔虫,新仔虫的帚胚在虫体分裂后逐渐形成,柄内肌丝则在柄鞘形成后逐渐长出。
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It takes about 0.5 h for a pollen tube from germination to arrive at the micropyle. About 0.5 h after pollination, the pollen tube releases two sperms into one synergid. At 0.5-2.5 h after pollination, the egg cell fuses with one sperm to form a zygote. About 10.0 h after pollination, the division of the zygote begins. The duration of the zygote lasts about 2.5-10.0 h. However, one sperm nucleus fuses with two polar nuclei at 1.0-3.0 h after pollination, and 5.0 h after pollination the primary endosperm nucleus begins to divide.
水稻受精过程经历的时间表如下:授粉后,花粉在柱头萌发;花粉萌发至花粉管进入珠孔大约需要0.5小时;授粉后0.5小时左右,花粉管进入一个助细胞,释放精子;授粉后0.5-2.5小时,精卵融合形成合子;授粉后约10.0小时,合子第1次分裂,合子期为授粉后2.5-10.0小时;授粉后1.0-3.0小时,精核与两极核融合;授粉后约5.0小时,初生胚乳核分裂。
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Though the gametic nucleus of normal cell didn't enter the amicronucleate cell, there were cytoplasm and organelle exchanges between two cells.
在接合对中,有小核细胞一方可以完成正常的减数分裂过程,既有配子核的形成、配子核的融合、配子核分裂,最终形成两个有小核的子细胞。
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It was showed that throughout the nuclear division, nuclear membrane did not disintegrate,lamina always existed; But only one lamin peptide (similar to lamin B in higher eukaryotes) was expressed during division,ant its expression quantity changed according to the progress of division: in interphase, lamin was constant; when entering G1 phase, lamin increased sharply; then, increased slowly untill division finished.
结果表明:在整个核分裂过程中,核膜不崩解,核纤层结构一直存在;但随着分裂的进展,始终只有一种成分(类似于高等生物lamin B )的表达;其表达量随着分裂时相的推移而变化:间期时,比较恒定,进入G1期时明显增加;以后不断略有增加,直到分裂完成。
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The karyotypes of four species in Pentatomidae were studied in male germ cells prepared on air dried slides stained with Giemsa.Karyotype analyses using specific software are made for the first time in pentatomid karyotypic study and model karyotype charts are presented.
研究了4种中国蝽科昆虫的核型和染色体的减数分裂行为,并首次在半翅目中采用核型分析软件对第一次减数分裂中期的染色体进行核型分析。
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Alternative layers of target material 〓 are irradiated with (47.5 MeV/u)〓 ions, the ternary fission events of hot nuclei are verified and the probabilityratioes of ternary fission relative to binary fission with projectile energy from25Mev/u to 47.5MeV/u are measured and reprodurced with calculation result ofstatistical cascade fission model program written by myself. The fact that ternaryfission at low excitation energy come from cascade fission is shown.
5MeV/u〓束轰击Bi靶时,用叠层靶技术,实验证明了热核三分裂变确实存在,并测量了25MeV/u~47.5MeV/u 〓三分裂变相对于二分裂的三二比的激发曲线,利用自编级联统计模型程序,模拟了低温热核的三分裂相对于二分裂的几率,结果也表明在较低激发时热核三分裂是级联三分裂。
- 更多网络解释与分裂核相关的网络解释 [注:此内容来源于网络,仅供参考]
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amitosis:无丝分裂
(一)无丝分裂(amitosis)也叫直接分裂,是一种比较简单的分裂方式. 在无丝分裂时看不见染色体的复杂变化,核物质直接分裂成二部分. 一般是从核仁开始,延长横裂为二,接着核延长,中间缢缩,分裂成2个核;同时,细胞质也随着拉长并分裂,
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endomitosis:有丝分裂
(1) 核内有有丝分裂(endomitosis): 核内染色体复制后并分裂,但不是形成子核,仍是一个核,结果加倍了的这些染色体都留在一个核内. (2) 核内染色体连续复制,但其着丝点并不分裂,因此形成 多线染色体(polytene chromosome),
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nuclear fission bomb:核分裂弹
核分裂 nuclear fission | 核分裂彈 nuclear fission bomb | 核分裂鏈反應 nuclear fission chain reaction
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fission fusion fission bomb:分裂-熔合-分裂弹
分裂核 fissionable nucleus | 分裂-熔合-分裂弹 fission-fusion-fission-bomb | 分裂分布 fissioning distribution
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fissionable nucleus:分裂核
分裂材料 fissionable material | 分裂核 fissionable nucleus | 分裂-熔合-分裂弹 fission-fusion-fission-bomb
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karyokinesis:核分裂
有丝分裂的过程较复杂,包括核分裂(karyokinesis)和胞质分裂(cytokinesis)两个步骤. 核分裂是一个连续的过程,从细胞核内出现染色体开始,经一系列的变化,最后分裂成二个子核(daughter nucleus)为止. 为了解说上的便利,
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karyokinesis:核分裂 有丝分裂
karyogenetics 核遗传学 | karyokinesis 核分裂 有丝分裂 | karyokineticphase 核分裂期
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karyokinesis; caryokinesis:核裂;核动;间接分裂;有丝分裂
核型图 karyogram | 核质体 karyoid | 核裂;核动;间接分裂;有丝分裂 karyokinesis; caryokinesis
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fission resonances:分裂共振
分裂反冲 fission recoils | 分裂共振 fission resonances | 分裂核种 fission species
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segmentation nucleus:分裂核
segmentation movement ==> 分节运动 | segmentation nucleus ==> 分裂核 | segmentation overlay ==> 分段覆盖,分段重叠