| 词汇 | lumen |
| 释义 | lumen noun[ C ] specializeduk /ˈluː.mən/ us /ˈluː.mən/ lumennoun[C] (UNIT OF LIGHT)physics (abbreviationlm) a unit for measuring the amount of light something produces: （光的单位）流明 a light bulb rated at 750 lumens 一只750流明的电灯泡 Miscellaneous units of measurement acre acreage caloric dioptre farad fathom firkin flashpoint hectare joule MHz newton refractive index röntgen Scoville scale SI unit sievert sun protection factor torr watt You can also find related words, phrases, and synonyms in the topics: Electricity - units lumennoun[C] (IN BODY)medical plurallumina or lumens the inside space of a tube-shaped organ in the body, for example a blood vessel or intestine: （身体内的）腔 intestinal/vascular lumen肠道／血管管腔 Substances & structures in the body abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus navicular neuroendocrine neurohormonal neurohormone nociceptive tendinous tendinum tendo tensor Th lumen | American Dictionarylumen noun[ C ] us/ˈlu·mən/ physics, earth science the standard unit for measuring the brightness of a light, equal to the amount of light hitting one square foot of surface one foot away from the light Examples of lumenlumen Washings from the lumen of the gut were passed through a sieve (154 mm mesh size) to recover even the smallest parasites. Indentations in the repaired region leave a somewhat tortuous lumen. The apical plasma membrane of the rachis is elevated to form numerous microvilli-like projections into the lumen. The apical plasma membrane extends into the lumen in microvilli-like projections. The thicker posterior end extends into the caecal lumen to facilitate mating and oviposition. The gradient in muscle tension created along the intestine (increased in jejunum and decreased in ileum) may promote propulsion of worms in the lumen. Exposures to high densities of cercariae could lead to encystment in other sites such as the kidney lumen or pericardial cavity. Although the lumen is not significantly narrowed, localized peaks of velocity, up to 2 m/sec were found close to the two indented regions. The uterine apical plasma membrane has microvilli-like projections into the lumen and the terminal bar lies between the apical ends of adjacent cells. In early embryos the two main collecting tubes were composed of a layer of cells which were wrapped around the lumen. Some of the stages present in the lumen appeared to be releasing the inner stages, and many showed evident signs of degeneration. Metacercarial cysts localize in the pericardial cavity and the kidney lumen of the snail and these organs would have a finite capacity for carrying cysts. The number of lumen worms (pre-adult and adult forms) was recorded. Developmental stages also appeared in the intestinal lumen, sometimes similar to the amoeboid stages observed by light microscopy. The stylet had acquired a distinct lumen as had the oesophageal duct and the oesophageal glands appeared to be fully developed. See all examples of lumen 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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