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基细胞
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  basal cell
    A QUESTION ABOUT A BASAL CELL
    关于一个“基细胞”的疑问
短句来源
    Both of the basal cell and the cap cell have dense cytoplasm.
    基细胞和帽细胞都具有浓厚的细胞质。
短句来源
    The generalized structure of the neetaries consists of a single,basal cell,and a single row of vertically oriented secretory cells.
    这些蜜腺的一般结构具有一个单一的基细胞以及一列纵行排列的分泌细胞。
短句来源
    With the devel- opment of the apical cell,the basal cell undergoes transverse division to form two cells: the upper one forms the single cell suspensor;
    随着顶细胞的发育,基细胞也进行横分裂产生上下两个细胞,上方一个体积略为增大而形成胚柄;
短句来源
    In shoulder and bottom of the basal cell there is no cuticular layer separating them from the epidermal cell and mesophyll cells,but in the walls connecting the basal cell with the epidermal cells and cap cell there are pronounced plasmodesmata.
    基细胞肩部和底部与表皮细胞和叶肉细胞之间没有角质层隔开,而基细胞与表皮细胞和帽细胞邻接的壁上有明显的胞间联丝。
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  “基细胞”译为未确定词的双语例句
    1 The shape and ultra structure glandular hairs of Pelargonium graveolens L'Herit. We observed that the glandular hair is composed of one base-cell,2 to 4 petiole cell and unicellular head.
    1香叶天竺葵腺毛的形态及超微结构观察到腺毛由1个基细胞、2-4细胞的柄部及单细胞的头部构成。
短句来源
    Apart from roots,rhizome,stem,the adaxial surfaces of the leaf sheaths and palea in the body of the plant of Spartina anglica,the salt glands are found in all other aerial parts,especially,they are abundant in lamina.
    大米草的盐腺在植物体的分布,除根、根茎、茎、叶鞘的近轴面以及内稃没有外,其他所有气生部分皆具有,尤其以叶片最多。 盐腺由两个细胞组成,大的基细胞和小的圆顶状的帽细胞。
短句来源
    Its epithelial cells are of three types: squamous, cuboidal and columnar.
    少数散在分布的基细胞位于柱状细胞的基部. 三种上皮细胞都有明细胞、暗细胞之分.
短句来源
    it showed a 2~3 fold increase in po-pulation density during 2~3 days of incubation.
    细胞经2~3天培养,浓度增加2~3倍,不断取用细胞及加入新培基,细胞可以持续悬浮增殖。
短句来源
    Species with closer affinity are accompanied by the similar shape and the equal rows of the cells at the base of trichones.
    亲缘关系较近的种类,其表皮毛也具有相似或相等的基细胞形状、列数等。
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  basal cell
The activated fibroblasts existed in the natural tissue planes between Bowman's layer and basal cell layer.
      
No change in the reactivity for HBGA was detected in the stratified epithelium overlying squamous cell or basal cell carcinomas, whereas a considerable loss of LAMPs was detected.
      
The changes of the contraction amplitude in comparsion to the basal cell shortening (cell shortening in μm and %) were continuously recorded with a one-dimensional high speed camera.
      
Adult from of basal cell navevus syndrome: A family study
      
The diagnosis of an adult form of basal cell naevus syndrome with an autosomal dominant mode of inheritance is discussed.
      
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本文报告大豆(品种为“丰地黄”)胚和胚乳发育的过程。大豆胚的发育基本上属十字花型(柳叶菜型)。因为合子首先进行横分裂,结果形成由顶细胞和基细胞构成的二细胞胚。顶细胞首先进行纵裂,成为胚体细胞的基础,基细胞发育成胚柄,而不参加胚体的形成。大豆胚柄由多列细胞組成,而十字花型(柳叶菜型)的典型代表 Capsella bursa-pastoris 和 Ludwigia palustris 的胚柄由一列细胞构成,因此与它们有明显区别。在由基细胞发育成由多列细胞粗成的胚柄过程中,观察到细胞的液泡化和后来液泡消失的过程。大豆传粉后两昼夜可见合子分裂形成二细胞胚。传粉后三天发育成3—8个细胞的胚。传粉后五天形成约由30—40个细胞组成的小圆球胚。传粉后八天发育成由更多细胞组成的大圆球胚。到传粉后十二天可以看到顶端扁平的胚,以及子叶、胚根和胚轴的分化。大豆胚乳的发育属核型。由受精的极核分裂成游离胚乳核,游离核以有丝分裂方式繁殖。它的最初几次有丝分裂是同时进行的,分裂速度与胚细胞分裂速度大体上相同。在胚乳发育过程中我们未见到无丝分裂现象,但尚不能断定在大豆胚乳发育过程中没有无丝分裂过程,因为我...

本文报告大豆(品种为“丰地黄”)胚和胚乳发育的过程。大豆胚的发育基本上属十字花型(柳叶菜型)。因为合子首先进行横分裂,结果形成由顶细胞和基细胞构成的二细胞胚。顶细胞首先进行纵裂,成为胚体细胞的基础,基细胞发育成胚柄,而不参加胚体的形成。大豆胚柄由多列细胞組成,而十字花型(柳叶菜型)的典型代表 Capsella bursa-pastoris 和 Ludwigia palustris 的胚柄由一列细胞构成,因此与它们有明显区别。在由基细胞发育成由多列细胞粗成的胚柄过程中,观察到细胞的液泡化和后来液泡消失的过程。大豆传粉后两昼夜可见合子分裂形成二细胞胚。传粉后三天发育成3—8个细胞的胚。传粉后五天形成约由30—40个细胞组成的小圆球胚。传粉后八天发育成由更多细胞组成的大圆球胚。到传粉后十二天可以看到顶端扁平的胚,以及子叶、胚根和胚轴的分化。大豆胚乳的发育属核型。由受精的极核分裂成游离胚乳核,游离核以有丝分裂方式繁殖。它的最初几次有丝分裂是同时进行的,分裂速度与胚细胞分裂速度大体上相同。在胚乳发育过程中我们未见到无丝分裂现象,但尚不能断定在大豆胚乳发育过程中没有无丝分裂过程,因为我们固定材料时间间隔较长。在较大圆球胚时胚乳开始形成细胞壁,细胞壁的形成过程自胚端开始,逐渐及于合点端。在子叶分化时胚乳细胞壁开始破坏,其过程也是自胚端(珠孔端)开始,逐渐及于合点端。在胚乳细胞退化时看到有巨大核和比正常胚乳核小的、梭形退化的胚乳核。

The purpose of this paper is to ascer-tain the cellular transformation in limbswith still fewer kinds of tissues thanthose in the experiments of Weiss (1925)and Thornton (1938a) by observing theregeneration of nerveless limb after exar-ticulation of the humerus. The nerveless larvae obtained by themathod as described by Chuang andWang (1956) were cultured in Holtfretersolution at a temperature of 20±1℃ for24 days, then the forelimb was amputatedand the humerus completely removed.Daily observation was made on...

The purpose of this paper is to ascer-tain the cellular transformation in limbswith still fewer kinds of tissues thanthose in the experiments of Weiss (1925)and Thornton (1938a) by observing theregeneration of nerveless limb after exar-ticulation of the humerus. The nerveless larvae obtained by themathod as described by Chuang andWang (1956) were cultured in Holtfretersolution at a temperature of 20±1℃ for24 days, then the forelimb was amputatedand the humerus completely removed.Daily observation was made on the ex-ternal changes and specimens were fixedat various stages for histological study. The external observation has shownthat most of the nerveless limb rege-nerated normally after the removal ofthe humerus, except a few number inwhich the upperarm remained very shortor even absent. The rate of morpho-genesis of these two types of regeneratewas the same as those of the normallarvae at the same age (see Fig. 1). For histological examination specialattention was paid to the changes duringthe early phase of regeneration. It re-vealed that, on the first day after ampu-tation the wound area became coveredby an epithelial thickening formed bythe migration of the sorrounding epi-thelial cells. There was no basementmembrane under the thickening whichwas in intimate contact with the innertissues (Plate I, 1.2). Dedifferentiation hadnot yet begun. On the second day astriking demarcation was formed betweenthe epithelial thickening and inner tis-sues. The former could easily be dis- tinguished from its surrounding, beinglightly stained with cells containingmore cytoplasm and nearly sphericalnuclei with dispersed chromatin granules(Plate I, 3.4). The dedifferentiation ofthe muscle into muscle elements hadbegun. They became dissociated fromthe region near the cut end, transformedinto mononucleated mesenchymal cells,the blastema cells, and aggregated underthe epithelium. On the third day theepithelial thickening was no longer visible,instead, an epithelium with the charac-teristics of the embryonic limb budcovered the cut surface. The dediffe-rentiation of the muscle of the upperarmwas almost completed and muscles of theshoulder girdle also became dissociatedto participate in the blastema formation(Plate I, 5. 6). During the time between4-6 days the dedifferentiation of the innertissues proceeded further and the numberof blastema cells increased rapidly.Simultaneously, mitosis, another way toincrease the number of blastema cells,occured. Cells resulted from both pro-cesses accumulated at the tip of thestump and formed the regenerationblastema (Plate Ⅰ, 7. 8). The further de-velopment of the blastema was histo-logically the same as those in the caseof normal larvae (Plate Ⅱ, 1, 2, 3).Finallya forelimb was formed in the most caseswith the cartilaginous parts in normalproportion (Plate Ⅱ, 5). Only in thoseexperiments in which the upperarmremained very short the humerus repre-sented by a small piece of cartilage(Plate Ⅱ, 4) or even absent. The dedifferentiation of muscle cellswas clearly shown in the present study.Although mesenchyme cells were alsopresent in the stump besides the musclecells and their possible participation inthe blastema formation could not beruled out, yet quantitatively, it is clearthat the main source of blastema cellswere derived from the muscle cells.Since the cartilage was absent in thestump, blastema cells from the abovementioned origin should be responsiblefor the redifferentiation of this structure.This provided a clear evidence that theblastema cells are multipotent and thatthe cellular transformation betweenvarious tissues is possible. Finally, the changes of the epithelialcells are worthy to be mentioned.Although they are essentially the sameas those described by Rose (1948) andThornton (1954, 1960) yet in theirexperiments the epithelium was inner-vated and the formation of the epithelialthickening has been ascribed to thestimulatory influence of the nerve bythe latter author. According to thepresent study, it can be said, at leastin the larval stage, the dedifferentiationof the epithelial cells at the early phaseof regeneration is independent of nervesupply.

1.年青的无神经幼虫前肢,切断并摘除肱骨后可以再生,除去在少数例子肱骨的再生不完全外,大多数的再生都是典型的。再生体形态建成速度也和同年龄的正常幼虫相近。2.再生芽基细胞起源于残肢中仅有的肌肉和结缔组织,其中肌肉在数量上比结缔组织多,去分化过程也非常明显,因此,作为早期再生芽基细胞的来源,肌肉组织可能比结缔组织更为重要。3.由肌肉和结缔组织去分化而来的芽基细胞,不仅能够分化为肌肉和结缔组织,而且能分化出典型的软骨。这表明芽基细胞的多潜能性,由某种组织去分化而来的细胞可以分化为另一种组织。4.表皮细胞在再生初期表现出形态去分化特征,它和内部组织之间有密切的连系,但是没有看到表皮细胞直接参入内部。

1.In the Cross section of the leaf of Spartina anglica there are a well deve- loped chlorenchymatous bundle sheath and a definite mesophyll layer sur- rounding the bundle sheath is often radially arranged. 2.In contrast,the chloroplasts in the bundle sheath differs from the chloroplasts in the surrounding mesophyll cells.The bundle sheath chloroplasts are larger and very rich in starch.The smaller chloroplasts of the mesophyll cells cont- ain little or no starch. 3.The chloroplasts of both the mesophyll and...

1.In the Cross section of the leaf of Spartina anglica there are a well deve- loped chlorenchymatous bundle sheath and a definite mesophyll layer sur- rounding the bundle sheath is often radially arranged. 2.In contrast,the chloroplasts in the bundle sheath differs from the chloroplasts in the surrounding mesophyll cells.The bundle sheath chloroplasts are larger and very rich in starch.The smaller chloroplasts of the mesophyll cells cont- ain little or no starch. 3.The chloroplasts of both the mesophyll and the bundle sheath cells contain many grana. 4.The salt glands occur on the both of the adaxial side and the abaxial side of the leaf in Spartina anglica.The salt gland is composed of two cells,a large basal cell and a smaller outer dome-shaped cap cell positions on a neck- like protrusion of the large basal cell.Both of the basal cell and the cap cell have dense cytoplasm.The basal cell has numerous mitochondria and infold- ings of the plasmalemma which extend into the basal cell and partition the basal cell cytoplasm.The cap cell has no partitioned membrane system. 5.The cuticle on the adaxial epidermis of the leaf is raised into large numbers of small papillae,but the abaxial cuticle is quite smooth.

1、大米草(Spartina anglica Hubbard)的叶片横切面,具有发达的绿色组织的维管束鞘和一层幅射状排列的叶肉细胞围绕着维管束鞘。2、叶的维管束鞘细胞的叶绿体不同于叶肉细胞的叶绿体。束鞘的叶绿体比较大、含淀粉较多;叶肉细胞的叶绿体较小、含少量淀粉粒或不合淀粉粒。3、束鞘细胞的叶绿体和叶肉细胞的叶绿体都含有许多基粒。4、叶片上下表皮都具有盐腺。盐腺由两个细胞构成,比较小的为园顶状帽细胞,位于较大的具颈状突起的基细胞上面。基细胞和帽细胞都具有浓厚的细胞质。基细胞具有许多线粒体和向内折叠的原生质膜将基细胞的细胞质分隔开。5、在近轴面,叶表皮的角质层上产生许多小乳凸,而远轴面叶表皮的角质层很光滑。

 
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