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单词 parenchyma
释义

Definition of parenchyma in English:

parenchyma

noun pəˈrɛŋkɪməpəˈrɛŋkəmə
mass nounAnatomy
  • 1The functional tissue of an organ as distinguished from the connective and supporting tissue.

    〔剖〕实质,主质

    the liver parenchyma
    Example sentencesExamples
    • Brain parenchyma from the parietal lobe showed venous congestion, hemorrhage, and diffuse edema.
    • The tumor, which is often but not always associated with cystic lung lesions, may arise in pulmonary parenchyma, the mediastinum, and pleura.
    • The tumor frequently extended to the adjacent lung parenchyma, bronchi, visceral pleura, and mediastinal soft tissues.
    • Lesions in the cerebral hemispheres and brainstem included perivascular lymphocytes in leptomeninges and parenchyma, with scattered microglial nodules in gray and white matter.
    • No myospherules were found within the renal parenchyma or the adipose tissue.
    1. 1.1Botany The cellular tissue, typically soft and succulent, found chiefly in the softer parts of leaves, pulp of fruits, bark and pith of stems, etc.
      〔植〕薄壁组织
      xylem parenchyma cells
      Example sentencesExamples
      • In many dicotyledonous leaves, parenchyma or sclerenchyma cells of the vascular bundle sheath extend to the epidermis on both leaf sides, forming the so-called bundle sheath extensions.
      • Endoreduplication has also been described in Arabidopsis leaf tissues and in parenchyma and cortex root cells of various species.
      • These layers include the epidermis, an exodermis in roots where it is differentiated, several layers of cortex cells, the endodermis, pericycle, xylem parenchyma cells and finally the vessels.
      • ABA loss directly from the symplast to the apoplast is up to 4000 times lower than from mesophyll cells, phloem elements and stem parenchyma cells.
      • In this study, the pectate lyase gene expression was located in the recent products of cambial divisions of both phloem and xylem and conspicuously localized in the xylem parenchyma cells of young vascular bundles.
    2. 1.2Zoology Cellular tissue lying between the body wall and the organs of invertebrate animals lacking a coelom, such as flatworms.
      〔动〕实质,主质
      Example sentencesExamples
      • Other mesodermal cells in the acoels are the peripheral parenchyma (connective tissue) and tunica cells of the gonads, and these also arise from the gastrodermis.
      • Parichnos tissue is parenchyma with lots of air space between cells.

Derivatives

  • parenchymal

  • adjective pəˈrɛŋkɪməlpəˈrɛŋkəm(ə)l
    Anatomy
    • Relating to or affecting the functional tissue of an organ.

      minimal or no parenchymal fibrosis is present
      Example sentencesExamples
      • The initial evaluation of the urinary sediment generally identifies patients with parenchymal renal disease.
      • Spirometric measures admittedly can be nonspecific; they do not appear to be well correlated with the parenchymal damage of emphysema in a generally healthy population.
      • The initial radiographic presentation of asbestosis is typically that of bilateral small primarily irregular parenchymal opacities in the lower lobes bilaterally.
  • parenchymatous

  • adjective parəŋˈkɪmətəsˌpɛrəŋˈkɪmədəs
    Botany
    • Consisting of or relating to the cellular tissue making up the softer parts of leaves, pulp of fruits, bark and pith of stems, etc.

      〔植〕薄壁组织

      parenchymatous cells are rare in the twigs and roots
      Example sentencesExamples
      • In non-angiosperm seed plants phloem elements consist mostly of sieve cells, while angiosperms have sieve tube cells in association with parenchymatous companion cells.
      • When applied to stems, oil moved through both stomata and intercellular spaces between epidermal cells; oil molecules diffused into the cytoplasm of both the epidermal and the parenchymatous cells.
      • The root is composed of a dorsal and ventral epidermis between which are sandwiched about six parenchymatous layers without intercellular spaces, and an anastomosing provascular strand.

Origin

Mid 17th century: from Greek parenkhuma 'something poured in besides', from para- 'beside' + enkhuma 'infusion'.

Definition of parenchyma in US English:

parenchyma

nounpəˈrɛŋkəməpəˈreNGkəmə
Anatomy
  • 1The functional tissue of an organ as distinguished from the connective and supporting tissue.

    〔剖〕实质,主质

    the liver parenchyma
    Example sentencesExamples
    • The tumor, which is often but not always associated with cystic lung lesions, may arise in pulmonary parenchyma, the mediastinum, and pleura.
    • The tumor frequently extended to the adjacent lung parenchyma, bronchi, visceral pleura, and mediastinal soft tissues.
    • Lesions in the cerebral hemispheres and brainstem included perivascular lymphocytes in leptomeninges and parenchyma, with scattered microglial nodules in gray and white matter.
    • No myospherules were found within the renal parenchyma or the adipose tissue.
    • Brain parenchyma from the parietal lobe showed venous congestion, hemorrhage, and diffuse edema.
    1. 1.1Botany The cellular tissue, typically soft and succulent, found chiefly in the softer parts of leaves, pulp of fruits, bark and pith of stems, etc.
      〔植〕薄壁组织
      xylem parenchyma cells
      Example sentencesExamples
      • These layers include the epidermis, an exodermis in roots where it is differentiated, several layers of cortex cells, the endodermis, pericycle, xylem parenchyma cells and finally the vessels.
      • ABA loss directly from the symplast to the apoplast is up to 4000 times lower than from mesophyll cells, phloem elements and stem parenchyma cells.
      • In this study, the pectate lyase gene expression was located in the recent products of cambial divisions of both phloem and xylem and conspicuously localized in the xylem parenchyma cells of young vascular bundles.
      • Endoreduplication has also been described in Arabidopsis leaf tissues and in parenchyma and cortex root cells of various species.
      • In many dicotyledonous leaves, parenchyma or sclerenchyma cells of the vascular bundle sheath extend to the epidermis on both leaf sides, forming the so-called bundle sheath extensions.
    2. 1.2Zoology Cellular tissue lying between the body wall and the organs of invertebrate animals lacking a coelom, such as flatworms.
      〔动〕实质,主质
      Example sentencesExamples
      • Parichnos tissue is parenchyma with lots of air space between cells.
      • Other mesodermal cells in the acoels are the peripheral parenchyma (connective tissue) and tunica cells of the gonads, and these also arise from the gastrodermis.

Origin

Mid 17th century: from Greek parenkhuma ‘something poured in besides’, from para- ‘beside’ + enkhuma ‘infusion’.

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更新时间:2024/12/27 15:33:34