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细胞核

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The process in cell division by which the nucleus divides, typically consisting of four stages, prophase, metaphase, anaphase, and telophase, and normally resulting in two new nuclei, each of which contains a complete copy of the parental chromosomes.

有丝分裂细胞分裂过程,其间细胞核分裂典型分为四步:前期、中期、后期和末期,并正常分裂成两个细胞核,每一个都含有母染色体的完全内涵

Candidum root and surrounded it, and later penetrated the velamen cells.Or mycorrhizal fungus penetrated the exodermal passage cells through the velamencells and further infected the cells of cortex, and then formed pelotons in the corticalcells.

真菌AR-15由根被侵入外皮层通道细胞,在外皮层通道细胞内形成菌丝结,进一步向皮层细胞侵染,从而形成内生菌根,紧靠外皮层的皮层细胞具有多个细胞核和核仁,还发现细胞核正在进行穿壁运动。

Cells of which DNA contents were more than 4C were 58.4%,which indicated the existence of proliferative vigorousness.

TM上皮细胞核面积及核周长介于正常上皮细胞与癌细胞之间,与后两者相比均有显著性差异(P<0.01),反映TM上皮细胞核有一定的异型性。

The nuclei were clear and the cell was well-stacked. Double layer structure could be seen in part of areas, displayed as monostratal keratinocytes linked with string-like cells. Most of keratinocytes differentiated into double layers, and cells linked with others with cable-like structure. The nuclei still could be seen.

部分区域细胞出现双层结构,表现为单层的角质形成细胞上面铺有连接成条索状的细胞。3周的角质形成细胞大部分为双层结构,异层及同层细胞之间彼此衔接,呈索形结构,细胞核仍然清晰可见,细胞不如2周时饱满。4周的角质形成细胞部分区域为三层结构,且细胞较前变得萎缩,表现为细胞浆减少,细胞核变小。

Two different protocols for the isolation of nuclei and nuclear extracts from Arabidopsis plants and suspension cells are described.

描述了从拟南芥植物和悬浮细胞中提取细胞核和分离细胞核的两种不同的实验方案。

RESULTS : The hypertrophic cardiomyocyte NTPase Vmax values at 1 week group and 4 week group were all increased significantly in both of ATP and GTP as substrates with much higher argumental extent in early hyper group; their Km values were kept constant in early hyper group and were decreased only in late hyper groups.

结果:早、晚期肥大组心肌细胞核被膜NTPase最大反应速率以ATP为底物时较对照组增加25%~62%(P<0.01),以GTP为底物时增加8%~44%(P<0.01),其中晚期肥大组NTPase最大反应速率增加幅度低于早期组。早期肥大组细胞核被膜NTPase Km值不变,晚期组NTPase Km值下降,以ATP和GTP为底物时晚期肥大组Km值分别下降22%和86%。

The light microscope observed four-layer structures of arthrodial cartilage, regularly ordered chondrocytes, even chromatin and clear nucleus in normal group. In the model group, the layer of arthrodial cartilage was thinning; chondrocytes in some regions showed karyopyknosis or necrosis with irregular order.

光镜下正常对照组关节软骨四层结构清晰可辨,软骨细胞排列整齐呈柱状,染色质分布均匀,细胞核清晰;模型对照组关节软骨层变薄,部分区域软骨细胞核固缩、坏死,软骨细胞排列紊乱,四层结构不易分辨。

Proliferating cell nuclear antigen is usually regarded as anindex of determinating cell proliferating and its expression levelin the nuclear is correlated with with the activity of cellproliferation. The activity of tumor cell proliferation can beknown by examinationing PCNA of tumor cells.

增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)常作为测定细胞增殖水平的指标,其在细胞核内阳性表达的高低与细胞增殖活性密切相关,通过检测肿瘤细胞的PCNA ,可了解和评价肿瘤组织的增殖活性。

The ultrastructure characters of pollen grain in Brassica napus are:1There are vacuoles in cytoplasm but no starch grain in uniceelluar pollengrain.2The veget- ative nucleus of bicellular pollen grain is generally spheroidal;while the generative cell is spinde-shaped,with a big nucleus,thin layer of cytoplasmand few cell orgens,no cell wall.3In three-celled pollen grain the sperm cell is separated from the cytoplasm of vegetative cell by two layers of plasmic membrances.

Brassica napus的花粉粒,在不同发育时期超微结构的特征如下:1单胞花粉粒有一个球形的细胞核和明显的核仁,细胞质内出现液泡,缺少典型的淀粉粒。2双胞花粉粒的营养核多为球形。生殖细胞纺锤形,无细胞壁,细胞核比例大,细胞质呈薄层,细胞器少。3三胞花粉粒有一个裂片状的营养核和两个纺锤形的精细胞,精细胞无壁,以两层质膜与营养细胞的细胞质相隔。

This result indicates that WT1 gene plays an important role in differentiation and development of fetal kidney and may be the factor that promotes metanephric blastemal cell to differentiate into epithelial cell.

结果显示小胎龄肾组织中WT1蛋白在胚基细胞和幼稚肾小球细胞核表达而大胎龄组肾组织中WT1在肾小管细胞胞浆表达,阳性率分别为57.1%(8/14)和46.2%(6/13),提示WT1基因在胚胎肾分化发育的过程中起着重要作用,WT1蛋白可能是促进后肾胚基细胞向上皮细胞分化的调控因子,其表达在时间上和空间上都受到严格的调控,WT1的表达异常可能导致胚基细胞分化停滞。17例肾母细胞瘤WT1蛋白表达阳性率为41.2%(7/17),阳性部位在胚基型和上皮型肿瘤细胞核,表达部位和阳性率与早期胚胎肾相似,其中间质型肾母细胞瘤均为阴性,胚基型和上皮型肾母细胞瘤阳性率70%(7/10),两组间阳性率有显著差异。

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