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单词 eyespot
释义

Definition of eyespot in English:

eyespot

noun ˈʌɪspɒtˈaɪspɑt
  • 1Zoology
    A light-sensitive pigmented spot on the bodies of invertebrates such as flatworms, starfishes, and microscopic crustaceans, and also in some unicellular organisms.

    Example sentencesExamples
    • However, pigmented eyespots are visible in wild-type larvae and late-stage embryos.
    • However, this eyespot probably cannot form an acute image but merely acts as a light sensor.
    • However, when the pigmented eyespot is absent, the light penetrates the body and the front-to - back contrast is reduced.
    • Its eyespots, located at the ends of the arms, sense light.
    • They do not have image-forming eyes, but many species have pigment cells and photoreceptors concentrated into eyespots.
  • 2A rounded eye-like marking on an animal, especially on the wing of a butterfly or moth.

    Example sentencesExamples
    • The male's head is blue and brown, and both sexes have bold, black eyespots at the napes of their necks.
    • A relationship between eyespot phenotype and N and Dll expression is demonstrated in a loss-of-eyespot mutant in which N and Dll expression is reduced at missing eyespot sites.
    • The bodies are light and ill-defended, except for the armored face, which is designed to draw attacks to it, like the eyespots on butterfly wings.
    • Its wings are mottled brown, small eyespots dotting the scalloped edges here and there, small circles with tails on them.
    • Pupae with low ecdysteroid levels develop into adults with small eyespots on their wings.
    • The colorful eyespots on butterfly wings may be patterned by a mechanism similar to that used to organize the proximo-distal axis of the insect leg.
    • Further, close observations of agonistic interactions revealed that individuals who were the first to display the eyespot were almost invariably the winners and ultimate social dominants.
    • For a second or two, the whale is so close that I can see its white eyespot, and then it dives.
    • The beautiful eyespots on butterfly wings are thought to rely on the principles described above, although involving more morphogens.
    • Butterfly eyespots have become a popular model system for the study of evolution and development.
  • 3mass noun A fungal disease of cereals and other cultivated grasses, characterized by yellowish oval spots on the leaves and stems.

    The fungus is typically Pseudocercosporella herpotrichoides, subdivision Deuteromycotina

    Example sentencesExamples
    • There have been reports of Physoderma brown spot, anthracnose, and eyespot developing in Illinois cornfields.
    • The pathogen survives on corn debris, so reduced tillage and continuous corn create a high-risk environment for development of eyespot, especially if there is heavy residue and a history of it in that location.
    • The percentage of stems affected by damaging lesions of eyespot at 22.1pc was the highest on record.
    • Where eyespot is over threshold the preferred fungicide would be cyprodinil although Punch and Landmark both have some activity against eyespot and can give useful control.
    • The eyespot fungus survives in the residue of infected plants for 3 or more years and is most severe under cool, wet conditions.
 
 

Definition of eyespot in US English:

eyespot

nounˈaɪspɑtˈīspät
  • 1Zoology
    A light-sensitive pigmented spot on the bodies of invertebrates such as flatworms, starfishes, and microscopic crustaceans, and also in some unicellular organisms.

    Example sentencesExamples
    • However, this eyespot probably cannot form an acute image but merely acts as a light sensor.
    • However, when the pigmented eyespot is absent, the light penetrates the body and the front-to - back contrast is reduced.
    • Its eyespots, located at the ends of the arms, sense light.
    • They do not have image-forming eyes, but many species have pigment cells and photoreceptors concentrated into eyespots.
    • However, pigmented eyespots are visible in wild-type larvae and late-stage embryos.
  • 2A rounded eye-like marking on an animal, especially on the wing of a butterfly or moth.

    Example sentencesExamples
    • Its wings are mottled brown, small eyespots dotting the scalloped edges here and there, small circles with tails on them.
    • The beautiful eyespots on butterfly wings are thought to rely on the principles described above, although involving more morphogens.
    • The colorful eyespots on butterfly wings may be patterned by a mechanism similar to that used to organize the proximo-distal axis of the insect leg.
    • Pupae with low ecdysteroid levels develop into adults with small eyespots on their wings.
    • For a second or two, the whale is so close that I can see its white eyespot, and then it dives.
    • A relationship between eyespot phenotype and N and Dll expression is demonstrated in a loss-of-eyespot mutant in which N and Dll expression is reduced at missing eyespot sites.
    • The male's head is blue and brown, and both sexes have bold, black eyespots at the napes of their necks.
    • Further, close observations of agonistic interactions revealed that individuals who were the first to display the eyespot were almost invariably the winners and ultimate social dominants.
    • Butterfly eyespots have become a popular model system for the study of evolution and development.
    • The bodies are light and ill-defended, except for the armored face, which is designed to draw attacks to it, like the eyespots on butterfly wings.
  • 3A fungal disease of cereals, sugar cane, and other cultivated grasses, characterized by yellowish oval spots on the leaves and stems.

    The fungus is typically Pseudocercosporella herpotrichoides, subdivision Deuteromycotina

    Example sentencesExamples
    • Where eyespot is over threshold the preferred fungicide would be cyprodinil although Punch and Landmark both have some activity against eyespot and can give useful control.
    • The percentage of stems affected by damaging lesions of eyespot at 22.1pc was the highest on record.
    • The eyespot fungus survives in the residue of infected plants for 3 or more years and is most severe under cool, wet conditions.
    • There have been reports of Physoderma brown spot, anthracnose, and eyespot developing in Illinois cornfields.
    • The pathogen survives on corn debris, so reduced tillage and continuous corn create a high-risk environment for development of eyespot, especially if there is heavy residue and a history of it in that location.
 
 
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更新时间:2024/12/23 0:54:16