lumen
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lumen
[lu´men] (L.)1. the cavity or channel within a tube or tubular organ, as a blood vessel or the intestine.
2. the SI unit of rate of flow of radiant energy, specifically that of the visible spectrum. adj., adj lu´minal.
lu·men
, pl.lu·mi·na
,lu·mens
(lū'men, -min-ă, -menz),1. The space in the interior of a hollow tubular structure (for example, artery or intestine).
2. The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela.
3. The volume enclosed within the membranes of a mitochondrion or of the endoplasmic reticulum.
4. The bore of a catheter or hollow needle.
[L. light, window]
lumen
(lo͞o′mən)n. pl. lu·mens or lu·mina (-mə-nə)
1. Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
2. Biology The interior of a membrane-bound compartment or organelle in a cell.
3. Abbr. lmPhysics The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions. See Table at measurement.
lu′men·al, lu′min·al adj.
lu·men
(lm), pl. lumina (lū'mĕn, -mi-nă)1. The space in the interior of a tubular structure, such as an artery or intestine.
2. The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela.
[L. light, window]
lumen
The inside of any tube, such as a blood vessel, an air passage (bronchus) or the intestine.lumen
any cavity enclosed within a cell, or structure, such as the lumen of the gut.Lumen
The inner cavity or canal of a tube-shaped organ, such as the bowel.
Mentioned in: Amebiasis
lumen
1. SI unit of luminous flux. It is equal to the flux emitted within a unit solid angle of one steradian by a point source with a luminous intensity of one candela. Symbol: lm. 2. The space in the interior of a tubular organ, such as an artery. See luminous flux; quantity of light; lux; SI unit.
| Table L4 Approximate luminance (in cd/m2) of some objects | |
| sun | 109 |
| car headlight | 107 |
| incandescent lamp (tungsten) | 106-107 |
| fluorescent lamp | 104-105 |
| clear sky at noon | 104 |
| cloudy sky at noon | 103 |
| shady street by day | 103-104 |
| full moon | 103 |
| book print under artificial light | >102 |
| photopic vision | >10 |
| street illumination | 1-10−1 |
| mesopic vision | 10-10−3 |
| cloudless night sky with full moon | 10−2 |
| scotopic vision | <10−3 |
| moonless and cloudless night sky | 10−3-10−6 |
lu·men
, pl. lumina (lūmĕn, -mi-nă)1. Space in interior of a hollow tubular structure (e.g., artery or intestine).
2. The bore of a catheter or hollow needle.
[L. light, window]