| 词汇 | cell-wall |
| 释义 | cell wall noun[ C ] biology specializeduk /ˈsel ˌwɔːl/ us /ˈsel ˌwɔːl/ the hard outer covering, consisting mainly of cellulose, that surrounds a plant cell细胞壁 Cells actin anaphase anti-platelet assort axoplasm histography homologous chromosomes infiltration intercellular intermitotic nerve fibre neurofibril neurofibrillary neuroglia neuroglial tetrad thrombocyte thymocyte turgor unciliated A typical living cell may be described as composed of a cell wall and contents. As a result the cell walls grow thinner with loss of moisture,—in other words, the cell shrinks. Each plant consists of a mass of protoplasm surrounded by an ill-defined cell wall. The membrane surrounding the cell is known as the cell wall, and in young plant cells is always composed of cellulose. While among plants the cell wall is almost always well developed, it is very common for animal cells to be entirely lacking in this external covering—as, for example, the white blood-cells. cell wall | American Dictionarycell wall noun[ C ] us/ˈsel ˌwɔl/ biology the hard outer covering that surrounds a plant cell and that consists mainly of cellulose Examples of cell wallcell wall Rather, a stimulus released from the cotyledon is more likely to induce the major cellwall degrading enzyme, endo- mannanase, within the endosperm itself. The endosperm has a very thick peripheral cellwall (cw). Therefore, most work has been performed on isolated aleurone layers (in which the starch is removed) and protoplasts (aleurone cells lacking the cellwall). A further factor relates to the potential biological deterioration of cellwall components by soft rot fungi, thereby reducing the strength of the wood. Proceeding from (b), as new cellwall formation continues to form during cytokinesis, these areas are devoid of surface projections. From a biological point of view, the role of the yeast adhesins was investigated by using different cellwall glycoprotein mutants. During development, the extensive thickening of the cellwall is specific to the lateral region of the endosperm and not to the micropylar region. For this species there is a good correlation between endosperm cellwall dissolution and radicle protrusion. The mechanisms regulating cellwall extensibility in the embryos before radicle protrusion, although central to germination control, remain elusive. All eggs which elicited a fertilisation potential secreted a detectable cellwall. What are the signals that trigger the transition from primary to secondary cellwall synthesis? Changes in the cellwall, vacuole, and membranes detected using electrical impedance spectroscopy. An additional experiment further suggested that the separation between the cellwall and plasma membrane was an artefact of the aqueous wash and dehydration process. However, direct evidence that these enzymes participate in cellwall modification or tissue weakening is still lacking. The essence of polarity is the redistribution and localisation of macromolecules, organelles and metabolic processes within the cytoplasm, plasmalemma and cellwall. See all examples of cell wall These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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