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two nuclei
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  两核
     There are distribution with 4,2,1 for four nuclei of coordinate H0,difference K15 and H24.Coordinates(30,15)(31,15)(32,15)(34,15) connect four nuclei of coordinate H0,two nuclei of K15,two nuclei of H34 on the quadrilateral area.
     坐标S轴、差K15与H24的有4,2,1分布. 四边形区坐标H15的(30,15)(31,15)(32,15)(34,15)分别联系着坐标S0四核,K15两核与H34两核素.
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     Authors think that when He + ion interacts with He atom, because one electron goes back and forth between two nuclei, the He + 2 can be formed with a strong binding energy.
     当He+ 离子与He原子相互作用时 ,由于一个电子往返运动于两核之间形成单电子键 ,从而使He+ 与He结合成为具有较强键能的He+ 2 。
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     In this paper, the number, ratio, total and highest quantum number of the quan-tum coherences, for 15 systems with two nuclei of nuclear--spin quantum numberI≥5/2 were computed by the computer.
     本文利用计算机,计算核自旋量子数I≥5/2的两核情况下的15种体系的各种量子相干的数目、比值、总和以及它们的最高量子数;
短句来源
     Objective By comparing the distribution characteristics of some chemical components at the boundary of CPu and GP to explore the morphologic basis of a new functional region between the two nuclei.
     目的 比较几种化学成分在大鼠尾壳核 (CPu)和苍白球 (GP)交界区的分布情况 ,以探讨两核团间新的功能区的形态学基础。
短句来源
     The hydrogen atomic protonized model was introduced in present paper for calculation of H_2~+ structural parameters. The dynamic equilibrium between Coulomb attraction and inter-nuclei repulsion force was discussed respectively from macro- and micro- time scale, and it is suggested that the charge barycenter, e/8, formed at the midpoint between two nuclei by distortional electron-clouds of hydrogen atoms, could astrict a naked proton.
     对氢分子离子提出了氢原子质子化的结构模型 ,从微观时标和宏观时标分析了H2 + 中库仑吸引力和两核排斥力的动态平衡 ,认为氢原子畸变后的电子云在两核中点产生e/ 8的电荷重心时可以束缚住一个裸质子 ;
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  “two nuclei”译为未确定词的双语例句
     The basidium, 2.0-3.0x6.5 10.0μm, are club-shaped and contains two nuclei.
     擔子大小爲2.0-3.0×. 5-10.0μm,棍棒状具變核。
     The experimental data for the β-delayed proton decays of 143Dy and 141Dy have been analyzed and the nuclear potential energy surfaces for the two nuclei have been calculated.
     分析了143Dy和141Dy的β缓发质子衰变的数据,对比计算了这两种核的核位能面。
短句来源
     2.The proportion of AVP in SON and PVN of SHR was significant higher than that of SD ,and theproportion of NOS in the two nuclei neurons of SD was higher than that of SHR.
     2.NOS与AVP在两组大鼠SON、PVN神经元内的比例存有差异:SHR组双标神经元以AVP反应优势型为主,SD组则以NOS反应优势型为主。
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     u. when the separation R of two nuclei at the center and an apexis 1.55a 0 and the curve for the centred square structure has a minimal energy -2.7539a. u.
     计算得知,两种构型均在R=1.55a0时有能量极小值E正四面体中心=-2.7899a.u.,E正方形中心=-2.7539a.u.。
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     The results showed that the structural characteristics of sexual propagation of Ag8(from Greece),Ag10(from Sichuan,China)and AgT(from Taiwan,China)is four basidiospores per basidium and two nuclei per basidospore.
     结果显示 ,来自欧洲希腊的Ag8、中国四川省的Ag10和台湾省的AgT菌株的有性繁殖结构特征是 4孢双核 ;
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  相似匹配句对
     Two.
     二.
短句来源
     Two.
     二、末日意识
短句来源
     TWO-NUCLEON TRANSFER REACTIONS ON DEFORMED NUCLEI
     形变偶偶核的二核子转移反应
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     non synchronous mitosis with two nuclei in same;
     同一细胞不同核的分裂不同步;
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  two nuclei
Competitive relations exist between the two nuclei, characterized by a significant decrease in the probability of transitions between the components of different nuclei.
      
The presented data of genetic and molecular biological studies testify in favor of the assumption that abnormal spores contain two nuclei, which form an "illegitimate" hybrid after fusion.
      
Results of cytological analysis conducted by the method of specific DNA staining confirmed the existence of exceptional tetrads, one spore of which contains two nuclei.
      
It is assumed that different replication rates of two nuclei of the heterokaryon probably underlie the appearance of HKC.
      
This potential was defined along the line joining the centers of the two nuclei ("centerline potential"), which, for deformed nuclei, contradicts the short-range character of the nucleon-nucleon (N N) nuclear interaction.
      
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The main difficulty of the one-electron theory of optical activity lies in the calculation of the so-called vicinal actions. This may be overcome, as suggested in the present investiga- tion by assuming that the vicinal actions are due to the interactions of various chemical bonds in the molecule with the chromophoric electron. For the calculation of these interactions the charge distribution of a single covalent bond is assumed to consist of two nuclei, each of unit positive charge, separated by the bond...

The main difficulty of the one-electron theory of optical activity lies in the calculation of the so-called vicinal actions. This may be overcome, as suggested in the present investiga- tion by assuming that the vicinal actions are due to the interactions of various chemical bonds in the molecule with the chromophoric electron. For the calculation of these interactions the charge distribution of a single covalent bond is assumed to consist of two nuclei, each of unit positive charge, separated by the bond distance and two electrons with opposite spins and a spherically symmetrical orbital eigenfunction represented by (?) where r is the distance measured from a certain point on the bond axis and near the center of the bond. The location of this point is so determined that the model will give the proper dipole moment of the bond. The exponent α, which determines the extent of diffusivity of the electron cloud, is obtained by an approximate variational treatment. The quadruple moment of this model, calculated for the C-H bond, agrees very well with that estimated by Lassettre and Dean from a study of the potential barrier hindering the internal rotation of the ethane molecule. To test the theory and also to illustrate the procedure which is followed in calculating optical rotations using the new model of vicinal actions, the optical rotations of several methyl derivatives of cyclopentanone have been calculated and the following conclusions have been reached: (1) The proposed model gives rise to optical rotations in agreement with the observed values. (2) The effect of the internal rotation of the methyl group on the molecular rotation [M]_D of 3-methylcyclopentanone is large, [M]_D being +44° and -130° for the cis- trans-conformations, respectively. (3) The observed [M]_D may be regarded as composed of two parts, namely, the contribution from the multipole terms and that from the orbital overlapping. The latter corresponds to the "incomplete screening of atomic nuclei", and has been regarded as the most important vicinal action in earlier calculations. In the present work, it is shown, however, that this effect contributes only a few percent of the total [M]_D, unless the perturbing group is very near to the chromophoric group as it is in the case of 2-methyl- cyclopentanone. The failure of the previous calculations is, therefore, due mainly to the omission of the multipole (especially the quadrupole) terms. (4) The absolute configuration of 3-methylcyclopentanone, indicated by the present calculation, is the opposite of the one suggested by Eyring, since he based on the overlapping contribution alone, which bears a sign opposite to that of the total [M]_D (5) That the observed [M]_D of 2,4,5,5-tetramethylcyclopentanone is considerably smaller than that of 2,4-dimethylcyclopentanone may be due to one or both of the following possibilities: (a) that the conformation of the 2- and 4-methyl groups slightly deviates from the trans-position in the tetra-methyl compound, due to the presence of the two additional methyl groups; (b) that the two additional methyl groups in 5,5-positions are not exactly symmetrical with respect to the ring so that they make contributions to [M]_D.

本文在量子力學的單電子旋光理論的鄰近作用問題上,作了如下的貢獻: 1.指出旋光度應由分子中各化學鍵,而不是分子中各原子(如像前人所假定的)對於生色團電子的微擾作用來計算,兩者的主要不同點在於是否考慮鍵的多極矩。 2.建議在旋光度的計算中,共價單鍵可以看作是由兩個處於鍵端的正電荷和一個以單中心狀態函數,表示出來的電子雲所組成。根據這個假定計算了環戊酮的甲基衍生物的旋光度,其結果與實驗值甚爲一致(詳見結果討論)。 3.計算結果證明甲基的內旋轉對於旋光度的影響很大,例如順式和反式構型的3-甲基環戊酮的旋光度,應分別為+44°和-30°。 4.指定了3-甲基環戊酮的絕對構型,其結果Eyring所指定者相反。

This article deals with a study of the method in inducing pollen plants from cultured anthers and cytological observations on the in vitro androgenesis of Triticale. The results obtained are summarized as follows: 1. Cell divisions of the uninucleate pollen grains and development of the am- phihaploid plants of Triticale can be readily obtained from anthers cultured on a basic mediam (slightly modified MS medium) supplemented with an appropriate amount of coconut milk and auxins (2,4--D, NAA). 2. The capacity...

This article deals with a study of the method in inducing pollen plants from cultured anthers and cytological observations on the in vitro androgenesis of Triticale. The results obtained are summarized as follows: 1. Cell divisions of the uninucleate pollen grains and development of the am- phihaploid plants of Triticale can be readily obtained from anthers cultured on a basic mediam (slightly modified MS medium) supplemented with an appropriate amount of coconut milk and auxins (2,4--D, NAA). 2. The capacity of callus production varied greatly in different Triticale strains. The pollens in the anthers of non-callus producing strains is potentially ca- pable in producing embryoids, but the embryoids produced by them degenerate in an early stage of development. 3. A higher proportion of the planted anthers producing shoots can be ob- tained, if the anthers containing embryoids had been transfered at a suitable time into the medium for differentiation before the embryoidal cells developed into callus. 4. The two nuclei formed by the first division of the uninucleate microspore are similar in appearance, they, however, generally differ in physiological functions. One of the nuclei having the nature of generative nucleus may divide and produce free nuclei which are eventually excluded in the course of embryoid development; the other having the nature of vegetative nucleus undergoes normal mitoses and therefore plays an essential role in the embryoid formation. 5. In the differentiating or meristematic cells the starch accumulation is generally rare, while in the cells surrounding them there are numerous starch grains.

本工作对小黑麦(Triticale)花粉植株的诱导方法及其雄核发育中的细胞学现象作了研究,所得结果如下: 1 .椰乳在诱导小黑麦花粉形成愈伤组织及其后由愈伤组织分化成苗上,都有良好的作用。 2.不同品系的小黑麦的花药在产生愈伤组织的能力上具有很大的差异。但是不能产生愈伤组织的品系的花药,不一定是花粉没有形成“胚状体”的能力,只是所产生的“胚状体”在发育的早期夭亡了。 3.在“胚状体”细胞没有完全愈伤组织化之前适时将其转移到分化苗的培养基上,可望得到较高的成苗率。 4.单核花粉粒第一次分裂所形成的两个核,虽然在外形上相似但生理上往往已有分化。其中一个具生殖核性质,以后的分裂多形成游离核,在“胚状体”的发育中最后被排除;另一个具营养核性质,以后的分裂形成细胞,在“胚状体”的建成中起主要的作用。 5.处于分化或分生状态的细胞内一般很少有淀粉的积累,但在其周围的细胞中则有多量淀粉粒存在。

Material of Fokienia hodginsii was collected in 1964 from Fengyangshan (alt.1000—1400 M)in Lungchuan county,Chekiang province. This paper deals with the fertilization in Fokienia.It includs the structure of male and female gametes as wall as the process of fusion of their nuclei and cytoplasm re- spectively. The division of the spermatogenous cell of Fokienia occurred by the end of June (1964)and two sperms similar in shape and size were formed when pollen tube rea- ched the top of archegonia.Two equalsperms...

Material of Fokienia hodginsii was collected in 1964 from Fengyangshan (alt.1000—1400 M)in Lungchuan county,Chekiang province. This paper deals with the fertilization in Fokienia.It includs the structure of male and female gametes as wall as the process of fusion of their nuclei and cytoplasm re- spectively. The division of the spermatogenous cell of Fokienia occurred by the end of June (1964)and two sperms similar in shape and size were formed when pollen tube rea- ched the top of archegonia.Two equalsperms look like two hemispherical bodies conjoin- ed togather.The sperm possesses cell wall and is about 65 μ in diameter.Its nucleus is rather large and about 45—50 μ in diameter.There is a nucleolus in the nucleus. Outside the nucleus the dense cytoplasm forms the deep colored zone,some 10 μ in thickness.This zone is separated from the nucleus by a narrow perinuclear zone,and from the plasmalemma by a marginal zone.The perinuelear zone is about 2 μ thick, and the mariginal zone is from 3 to 4 μ thick.Both zones have transparent cytoplasm. When the archegonium is formed,the central cell has a small nucleus which is located below the neck cells.At the middle of June(1964),the central cell divides to form the ventral nucleus and the egg nucleus.The egg nucleus sites primarily at the upper part of archegonium and has only one nucleolus.Then the egg nucleus in- creases gradually in size and moves to the central part of the archegonium.In ma- ture archegonium there are usually 4—5,rarely 6—7 nucleoli in the egg nucleus,each of them is about 15 μ in diameter.The egg cell in Fokienia hodginsii is about 500 μ in length.The female nucleus is larger than the male one.After egg cell matures, its cytoplasm increases gradually,while the central vacuole decreases gradually and almost disappears completely after fertilization.It is interesting to note that there are 1—2 dense cytoplasm masses at the upper or lower part of egg nucleus.The shape of the mass is similar to that of the egg nucleus but no membrane is formed.These cy- toplasm masses are about 50—70 μ in dianmter in some cases. The fertilization of Fokienia took place at the end of June when the growing tip of pollen tube had reached the top of the archegonium.Then the neck cells become disorganized and degenerated.It is possible that all the cytoplasmic contents of pollen tubes are released into the archegonium.Before fertilization,the cytoplasm around the sperms and sterile cell and tube nucleus are in front of these two sperms.Then the sperms separate from each other and come down into the cytoplasm of the egg. When the male nucleus contacts with the egg nucleus,both become flattened along their contaet surface.Then the nuclear membranes of both sperm and egg nuclei be- eome ultimately disintegrated.Thus the fusion process is complete.However,it is usually seen that the entire sperm nucleus does not sink into the egg nucleus in Fokie- nia,though the opposite is the case in an exceptional example.When the sperm nuc- leus passes into the cytoplasm of egg cell,its cytopasm is released inside the arche- gonium along with it.During the course of fusion of the male and female nuclei,the fertilized nucleus is surrounded by both female and male cytoplasm.Thus the male cytoplasm along with the peripheral cytoplasm of the egg cell invests the two nuclei lying in contact and forms a dense neocytoplasm.When the zygote divides,the neocy- toplasm is full of the starch grains and a dense cytoplasm sheath is formed. After fertilization,the fused nucleus moves toward the base of the egg cell.It seems that the movement of the fused nucleus is not a simple mechanical movement but turned over repeatedly toward the base of the archegonium.Sometimes the position of the sperm and egg nuclei makes a turn of 180°.At the same time the track of the fertilized egg nucleus with vacuoles in the archegonium may be traced. After zygote moves into basal part of the archegonium,first intranuclear mitosis occurs.The nuclear envelop of zygote disappears gradually at the telophase of the first mitosis.Then division of the free nuclei of proembryo follows. From fertilization to the stage of proembryo formation,the second sperm may sometines enter into the cytoplasm of the egg cell.Mitosis of the second sperm nucleus may take place(fig.17—18)in the upper part of the archegonium.In addition,there are often several supernumerary nuclei(as many as 7—8 in number)in the same egg cell.These nuclei are also surrounded by dense cytoplasm.They may persist for some time and be recognizable at somewhat later stages of the proembryo or even after the elongated suspensors are formed.In some cases,there are some cell groups above the upper tier of proembryo.These cell groups are also surrounded by dense cytoplasm. Either the supernumerary nuclei or cells are surrounded by the dense cytoplasm.Pro- bably they are derived from the mitosis or amitosis of the second sperm. Investigations on submicroscopic structures of sperm and egg in relation to the fer- tilization of Cupressaceae have been carried out extensively during the last decade.The fate of male cytoplasm has been debated for a long time and this problem attracted attention again in the nineteen seventies.At last the concept of neocytoplasm has been established soundly based upon the information from observation of electron microp- hotographs.The neocytoplasm is also visible under the light microscope though the components are not recognizable.The sperms of Fokienia are similar to those of Cupressus funebris,Juniperus communis,Sabina virginiana,Tetraclinis articulata,Cha- maecyparis pisifera as well as the genus Thujopsis and others.Two sperms are all effective in fertilization and this is the common phenomenon of the family Cupres- saceae.

福建柏精原细胞分裂后,产生两个形态和大小都相同的雄配子——精子;精子形成时,犹如两个相连的半球体,各具细胞壁。中央细胞分裂产生腹沟核和卵核,腹沟核形成后逐渐退化;卵核却迅速增大。6月下旬,精核在颈卵器中部或中上部与卵核相遇,进行受精作用。在精卵融合过程中,进入卵细胞的雄细胞质,逐渐包围受精卵,并与部分卵细胞质结合形成新细胞质。受精后,在新细胞质中,又呈现大量淀粉粒。当受精卵移到颈卵器底部时,合子开始进行第一次有丝分裂。在原胚和幼胚发育阶段,多余精核还可进入卵细胞,并进行有丝分裂,以致形成7—8个游离核。

 
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