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In plants, sucrose transport is distributed throughout the plant by the proton-pump where the pump, as discussed above, creates a gradient of protons so that there are many more on one side of the membrane than the other. As the protons diffuse back across the membrane, the free energy liberated by this diffusion is used to co-transport sucrose ...
Comparison of transport proteins. A symporter is an integral membrane protein that is involved in the transport of two (or more) different molecules across the cell membrane in the same direction.
In August 1960, in Prague, Robert K. Crane presented for the first time his discovery of the sodium-glucose cotransport as the mechanism for intestinal glucose absorption. [21] Crane's discovery of cotransport was the first ever proposal of flux coupling in biology. [22] [23]
In August 1960, in Prague, Robert K. Crane presented for the first time his discovery of the sodium-glucose cotransport as the mechanism for intestinal glucose absorption. [17] Crane's discovery of cotransport was the first-ever proposal of flux coupling in biology. [18] [19]
The NKCC1 isoform consists of about 1,200 amino acids, with about 500 amino acids residues giving rise to twelve hydrophobic transmembrane regions. [5] However, evidence of a shorter NKCC1 mRNA transcript (6.7 kb to 7-7.5 kb) in skeletal muscle cells gives support that further NKCC1 variants exists in a tissue-specific manner. [6]
A comparison of transport proteins [1]. An antiporter (also called exchanger or counter-transporter) is an integral membrane protein that uses secondary active transport to move two or more molecules in opposite directions across a phospholipid membrane.
Crane's discovery of cotransport was the first ever proposal of flux coupling in biology. [16] Crane in 1961 was the first to formulate the cotransport concept to explain active transport. Specifically, he proposed that the accumulation of glucose in the intestinal epithelium across the brush border membrane was [is] coupled to downhill Na+ ...
In cellular biology, membrane transport refers to the collection of mechanisms that regulate the passage of solutes such as ions and small molecules through biological membranes, which are lipid bilayers that contain proteins embedded in them. The regulation of passage through the membrane is due to selective membrane permeability – a ...