Search results
Results from the WOW.Com Content Network
Cross section of the gut. The lumen is the space in the middle also known as the volume. Normal histology of the breast, with lumen annotated at bottom right [1] In biology, a lumen (pl.: lumina) is the inside space of a tubular structure, such as an artery or intestine. [2] It comes from Latin lumen 'an opening'. It can refer to:
The translocon (also known as a translocator or translocation channel) is a complex of proteins associated with the translocation of polypeptides across membranes. [1] In eukaryotes the term translocon most commonly refers to the complex that transports nascent polypeptides with a targeting signal sequence into the interior (cisternal or lumenal) space of the endoplasmic reticulum (ER) from ...
The lumen's pH (~4.5–5.0) [3] is optimal for the enzymes involved in hydrolysis, analogous to the activity of the stomach. Besides degradation of polymers, the lysosome is involved in cell processes of secretion, plasma membrane repair, apoptosis, cell signaling, and energy metabolism. [4] Lysosomes digest material.
The mucosa is the innermost layer of the gastrointestinal tract. The mucosa surrounds the lumen, or open space within the tube. This layer comes in direct contact with digested food . The mucosa is made up of: Epithelium – innermost layer. Responsible for most digestive, absorptive and secretory processes.
The phospholipid membrane encloses the cisternal space (or lumen), which is continuous with the perinuclear space but separate from the cytosol. The functions of the endoplasmic reticulum can be summarized as the synthesis and export of proteins and membrane lipids, but varies between ER and cell type and cell function.
Within the perinuclear space (between inner and outer nuclear membranes) are SUN-1 and -2 which form connections with the KASH domain proteins on nesprin and the nuclear envelope lumen. [3] Interestingly, the removal of either SUN -1 or -2 individually will not disrupt LINC complex connectivity, indicating the similarity between the two proteins.
Flying and glowing firefly, Photinus pyralis Female glowworm, Lampyris noctiluca. Bioluminescence is the emission of light during a chemiluminescence reaction by living organisms. [1]
The protons in the lumen come from three primary sources. Photolysis by photosystem II oxidises water to oxygen, protons and electrons in the lumen. The transfer of electrons from photosystem II to plastoquinone during non-cyclic electron transport consumes two protons from the stroma. These are released in the lumen when the reduced ...