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  • The unit of luminous flux. The lumen is equal to the luminous flux emitted by a 1-candle light source at a 1 ft distance. The foot-candle represents one lumen per square foot.
  • space within an organ or tube
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • The channel within a tubular organ; for example, the lumen of the intestine.
    Source: Biotechnology Glossary

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