Lumen

lumen
space within an organ or tube
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Lumen
A term used when referring to the cavity or passageway within a tubular structure (ex. the interior space of a seminiferous tubule).
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lumen
[L. light]
The cavity of a tubular structure, such as endoplasmic reticulum or a blood vessel.
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lumen The cavity of a tube or organ.
lung An organ of the respiratory system in which gas exchange occurs between body fluids (e.g., blood) and air.
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lumen
Any cavity enclosed within a cell or structure, such as the lumen of the gut.
Covered in Lab 15 Vertebrate Dissection I ...
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- in the lumen of the digestive system by nucleosidases into nitrogenous bases and ribose (or deoxyribose). - inside the cell by nucleoside phosphorylases into nitrogenous bases, and ribose-1-phosphate (or deoxyribose-1-phosphate).
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the growing polypeptide chain is extruded through a pore in the ER membrane and into the lumen of the ER.
the signal sequence is usually clipped off the polypeptide unless the polypeptide is to be retained as an integral membrane protein.
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The bile salts return to the lumen to repeat the process. Fat digestion is usually completed by the time the food reaches the ileum (lower third) of the small intestine.
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In eukaryotic cells, disulfide bonds are formed in the lumen of the RER (rough endoplasmic reticulum) but not in the cytosol.
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These are connected by two transmembrane helices separated by a short loop projecting into the ER lumen. The C-terminal domain of SREBP interacts with the C-terminal domain of SREBP-cleavage-activating protein (SCAP).
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The transport vesicles from the ER fuse with the cis face of the Golgi apparatus (to the cisternae) and empty their protein content into the Golgi lumen.
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The rough ER functions in protein synthesis, especially proteins that are to be secreted to outside the cell (example: hormones). Proteins enter the lumen (interior) of the endoplasmic reticulum while being synthesized.
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lysosomes - membrane-bounded organelle in eucaryotic cells containing digestive enzymes, which are typically most active at the acid pH found in the lumen of lysosomes ...
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Signal Peptidase: An enzyme present within the lumen of the endoplasmic reticulum which proteolytically cleaves a secreted protein at the site of a signal sequence.
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Similarly, the attachment structures, we think that it's part of a survival mechanism for the bacteria. If we better understand that, we can better understand how we can prevent the attachment to the surface of the lumen, of the intestine of humans.
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