| 单词 | nucleolus |
| 例句 | The nucleolus within the nucleus is the site for ribosome assembly. Concepts of Biology 2013-04-25T00:00:00Z Pre-rRNAs are transcribed, processed, and assembled into ribosomes in the nucleolus. Biology for AP Courses 2022-06-09T00:00:00Z Most nuclei also contain a nucleolus, which is a region of the nucleus where ribosome assembly begins. Miller & Levine Biology 2018-01-01T00:00:00Z The nucleus contains one or more nucleoli, which serve as sites for ribosome synthesis. Anatomy and Physiology 2013-06-19T00:00:00Z All eukaryotes have the exact same set of organelles familiar to anyone who has studied cell biology: nucleus, nucleolus, ribosomes, rough and smooth endoplasmic reticulum, Golgi apparatus, cytoskeleton, lysosome and centriole. Heated Debate Persists over the Origins of Complex Cells 2022-06-13T04:00:00Z Yet many other well-known cellular structures, including the nucleolus—an organelle within the nucleus—and the RNA-processing Cajal bodies, lack membranes. Sloppy science or groundbreaking idea? Theory for how cells organize contents divides biologists 2021-01-21T05:00:00Z The nucleus houses DNA, and the nucleolus within the nucleus is the site of ribosome assembly. Biology for AP Courses 2022-06-09T00:00:00Z The nuclear envelope is reconstructed and the nucleolus becomes visible in each new cell. Miller & Levine Biology 2018-01-01T00:00:00Z The nucleolus is a region of the nucleus that is responsible for manufacturing the RNA necessary for construction of ribosomes. Anatomy and Physiology 2013-06-19T00:00:00Z One such condensate is the nucleolus, in which the ribosome machinery involved in protein synthesis is made. Formation of liquid-like cellular organelles depends on their composition 2020-05-05T04:00:00Z In 2012, Brangwynne and colleagues saw similar fluid features in the nucleolus, a dense mix of proteins, RNA, and DNA that manufactures ribosomes, the cell’s protein factories. Sloppy science or groundbreaking idea? Theory for how cells organize contents divides biologists 2021-01-21T05:00:00Z The function of lysosomes would be hindered, as hydrolases are formed by nucleolus. Biology for AP Courses 2022-06-09T00:00:00Z More membraneless structures continued to be found, such as the nucleolus, a dense structure in the cell nucleus. "Lava-Lamp" Proteins May Help Cells Cheat Death 2018-11-28T05:00:00Z The nucleolus disappears early during this phase, and the nuclear envelope also disintegrates. Anatomy and Physiology 2013-06-19T00:00:00Z The group found that increasing the overall concentration of NPM1 in cells increased the corresponding saturation concentration at which the nucleolus forms in the nucleoplasm. Formation of liquid-like cellular organelles depends on their composition 2020-05-05T04:00:00Z The nucleus is dynamic, with everything—the chromosomes, the nucleolus, and so on—swirling around seemingly randomly. Moving DNA to a different part of the nucleus can change how it works 2018-10-11T04:00:00Z The nucleolus is a condensed region of chromatin where ribosome synthesis occurs. Biology for AP Courses 2022-06-09T00:00:00Z The team at the Cancer Research UK centre focused on a structure found inside cells called the nucleolus. Aspirin 'helps block tumour formation' 2018-06-04T04:00:00Z When food is restricted, or a metabolic pathway is silenced or slowed down, nucleoli shrink, making fewer ribosomes, and cells live longer. The Thing Inside Your Cells That Might Determine How Long You Live 2018-05-20T04:00:00Z This finding highlights that nucleoli might not only act to concentrate key molecules and facilitate biochemical reactions, but also possess an underlying conveyor-belt mechanism to ensure a continuous and smooth production process. Formation of liquid-like cellular organelles depends on their composition 2020-05-05T04:00:00Z He and Hayward were thought of as the nucleolus of a young Jazz roster. Forgotten man: Derrick Favors ready to bounce back with Jazz 2017-09-25T04:00:00Z In eukaryotes, the nucleolus is completely specialized for the synthesis and assembly of rRNAs. Biology for AP Courses 2022-06-09T00:00:00Z They found that aspirin blocks a molecule named TIF-IA, which is essential for the nucleolus to function. Aspirin 'helps block tumour formation' 2018-06-04T04:00:00Z Later, as researchers studied these processes, all signs seemed to point to the nucleolus. The Thing Inside Your Cells That Might Determine How Long You Live 2018-05-20T04:00:00Z Hence, the reputation of the nucleolus as the ribosome factory might be even more pertinent than people thought7. Formation of liquid-like cellular organelles depends on their composition 2020-05-05T04:00:00Z These are the nucleoli—zones where genes are especially active. An atlas of where proteins are found in cells 2016-12-08T05:00:00Z The nucleus’s nucleolus is the site of ribosome assembly. Biology for AP Courses 2022-06-09T00:00:00Z For example, when GR or PR is added to cells in culture, it enters and accumulates in nucleoli, which leads to defects in RNA processing and subsequent cell death125. Decoding ALS: from genes to mechanism : Nature : Nature Research 2016-11-08T05:00:00Z But there’s more to the nucleolus than just making ribosomes. The Thing Inside Your Cells That Might Determine How Long You Live 2018-05-20T04:00:00Z Figure 1 | Protein–RNA interactions control biological processes in the nucleolus. Formation of liquid-like cellular organelles depends on their composition 2020-05-05T04:00:00Z The nuclei of most normal frog cells contain two of the bodies called nucleoli; the nuclei of cells carrying the mutation never have more than one. Transplanted Nuclei and Cell Differentiation, by Sir John B. Gurdon 2012-10-09T23:45:00.177Z The nucleus’s nucleolus is the site of ribosome assembly. Biology for AP Courses 2022-06-09T00:00:00Z As yet the two natures and functions of the nucleus and nucleolus are by no means cleared up. The Contemporary Review, Volume 36, October 1879 2012-04-18T02:00:17.060Z If building a cell were like building a building, and the DNA contained the blueprint, the nucleolus would be the construction manager or engineer. The Thing Inside Your Cells That Might Determine How Long You Live 2018-05-20T04:00:00Z The ribosome is a protein-synthesizing machine that is assembled from protein and RNA subunits in the nucleolus. Formation of liquid-like cellular organelles depends on their composition 2020-05-05T04:00:00Z In addition to the chromatin there may be present in the nucleus one or more, usually spherical, and as yet somewhat enigmatical bodies, the “nucleoli.” Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z If the nucleolus were not able to carry out its function, what other cellular organelles would be affected? Biology for AP Courses 2022-06-09T00:00:00Z The nucleus often appears to contain a complexity of fibrils, transitory aggregations of which have been supposed to cause the appearance of nucleoli. The Contemporary Review, Volume 36, October 1879 2012-04-18T02:00:17.060Z “We think that the smaller nucleoli may be a cellular hallmark of longevity” in certain cells under certain conditions, he added. The Thing Inside Your Cells That Might Determine How Long You Live 2018-05-20T04:00:00Z Possibly the nucleolus is the Supra- and Subconscious element. Feminism and Sex-Extinction 2011-11-11T03:00:29.100Z Identify the nucleus, cytoplasm, and, if present, the nucleolus or the micronucleus, and the cell wall. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z The nucleoplasm is the semi-solid fluid inside the nucleus, where we find the chromatin and the nucleolus. Biology for AP Courses 2022-06-09T00:00:00Z This nucleus may in its turn contain a nucleolus. The Mechanism of Life This is probably homologous with the chromatin nucleolus described for the spermatids of the Coleoptera. Studies in Spermatogenesis Part II Another spindle, showing three granules which are probably remains of nucleoli. Studies in Spermatogenesis Part I Within the nucleus are often to be found one or two nucleoli with a relatively thick and deeply stained membrane. Histology of the Blood Normal and Pathological Some bacteria have the DNA enclosed by two membranes; however, there is no evidence of a nucleolus or nuclear pores. Biology for AP Courses 2022-06-09T00:00:00Z We may in this way obtain endless varieties, nuclei which are opaque or transparent, with or without a nucleolus, and cells containing homogeneous cytoplasm without a nucleus. The Mechanism of Life If, now, we add acetic acid, we discover also tolerably large nuclei with nucleoli. The World's Greatest Books — Volume 15 — Science Four spermatid nuclei in one cell, each nucleus containing one nucleolus. Studies in Spermatogenesis Part I They are nucleated cells, the nucleus going by the special name of the germinal vesicle and the nucleolus the germinal spot. Text Book of Biology, Part 1: Vertebrata A nerve cell is formed, with its protoplasm, its nucleus and its nucleoli before being irritated; its properties precede its functions. The Mind and the Brain Being the Authorised Translation of L'Âme et le Corps In anucleate cells there is probably only a single process of layer formation round an infinitely small nucleolus. Form and Function A Contribution to the History of Animal Morphology The nucleus in its turn, in completely developed cells, very constantly encloses another structure within itself—the so-called nucleolus. The World's Greatest Books — Volume 15 — Science Thionin was found to be a very useful stain for distinguishing between the accessory chromosome and an ordinary nucleolus. Studies in Spermatogenesis Part I It is simply a single cell, with some power of amoeboid motion, a single nucleus and nucleolus; and in amphioxus its protoplasm is clear and transparent. Text Book of Biology, Part 1: Vertebrata This body is called the nucleus of the cell, and the small one within it, the nucleolus. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Within the nucleus there was often a small dark spot or sphere—the nucleolus. Form and Function A Contribution to the History of Animal Morphology Lying within the nucleus there are usually to be seen one or more smaller rounded bodies which have been called nucleoli. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity Figures 5 and 6 are young spermatocytes, showing the division of the nucleolus. Studies in Spermatogenesis Part I With the microscope at his eye, he magnifies nature's mysteries; he sums up the investigations of the Hertwig brothers; he discourses learnedly of the nucleolus of the Cytula—or progeny cell. Editorials from the Hearst Newspapers The nucleus is large and distinct in the larger species, and has a noticeably large and conspicuous nucleolus. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The substance of the notochord consisted of polyhedral cells having attached to their wall an oval disc similar in all respects to the nucleus of the plant-cell, and like it containing one or more nucleoli. Form and Function A Contribution to the History of Animal Morphology The nucleii differ also in the number of nucleoli they contain as well as in other less important particulars. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity On the behavior of the nucleolus in the spermatogenesis of Periplaneta americana. Studies in Spermatogenesis Part I Why, I have known the novel shape of a nucleolus, or a trifling peculiarity of striped muscular fibre seen under a 300-diameter lens, fill me with exultation. The Parasite At first no nucleoli are present in the daughter nuclei, but they appear before the division is complete. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses They contained a nucleus with one or two nucleoli, and the nucleus was often resorbed, as in plants, when the cell reached its full development. Form and Function A Contribution to the History of Animal Morphology During this process of the formation of the chromosomes the nucleoli disappear, sometimes being absorbed apparently in the chromosomes, and sometimes being ejected into the cell body, where they disappear. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity Partial rest stage between first and second maturation divisions, two nucleoli present. Studies in Spermatogenesis Part I In many cells the nucleus is finely granular or reticulated in appearance, and on the threads of the meshwork may be one or more enlargements, called nucleoli. A Practical Physiology B–F, early stages in the division of the nucleus. par. nucleolus; acetic acid, gentian violet, × 350. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses In the thick fine-grained yelk we find a clear round germinal vesicle of about 1/750 of an inch in diameter, and this encloses a small embryonic spot or nucleolus. The Evolution of Man — Volume 2 In a knot of the network is contained the dark, stiff, opaque nuclear corpuscle or nucleolus. The Evolution of Man — Volume 1 The aberrant bodies in these figures are probably remains of the nucleoli; they are found only in iron-hæmatoxylin preparations. Studies in Spermatogenesis Part I In brief, then, a cell is a mass of nucleated protoplasm; the nucleus may have a nucleolus, and the cell may be limited by a cell wall. A Practical Physiology Besides the free calciferous cells in which no nucleus was visible, other and rather larger free cells were seen on three occasions; and these contained a distinct nucleus and nucleolus. The formation of vegetable mould through the action of worms, with observations on their habits Conjointly with the materials which take part in the formation of the nuclear spindle and other processes in the cell, the chromatin accumulates in the resting nucleus to form the nucleoli. Darwin and Modern Science In the middle of the cell is the large transparent round nucleus, one nucleolus, and, within the latter again, a nucleolinus. The Evolution of Man — Volume 1 Various forms assumed by the combined nucleolus and element x; last figure from a giant cell. Studies in Spermatogenesis Part I Nerve cells, which may be regarded as the central organs of the nerve fibers, consist of masses of cell protoplasm, with a large nucleus and nucleolus. A Practical Physiology There is nothing in the resting nucleus of the spermatogonia which would suggest either a nucleolus or an accessory chromosome. Studies in Spermatogenesis Part I If the body be studied in its development, it is found to originate from a single mass of nucleated protoplasm, a single cell with a nucleus and nucleolus. A Practical Physiology This encloses a darker granule, the germinal spot, which shows a nucleolus. The Evolution of Man — Volume 1 |
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