Movement of Uroporphyrin and Coproporphyrin across the Rabbit Red Cell Membrane: Evidence for an Active Transport System

2015 ◽  
pp. 390-397
Author(s):  
S. Kramer ◽  
J. D. Viljoen ◽  
D. M. Becker
Keyword(s):  
Cell Membrane ◽  
Active Transport ◽  
Transport System ◽  
Red Cell ◽  
Red Cell Membrane ◽  
Active Transport System

Calcein is excreted from the intestinal mucosal cell membrane by the active transport system

Life Sciences ◽  
1996 ◽  
Vol 60 (4-5) ◽  
pp. 307-313 ◽  
Author(s):  
Takuya Fujita ◽  
Hidenori Yamada ◽  
Masaki Fukuzumi ◽  
Asuka Nishimaki ◽  
Akira Yamamoto ◽  
...  
Keyword(s):  
Cell Membrane ◽  
Active Transport ◽  
Transport System ◽  
Mucosal Cell ◽  
Active Transport System ◽  
Intestinal Mucosal Cell

On the structural organization of biological pumps and channels

1984 ◽  
Vol 42 ◽  
pp. 138-141
Author(s):  
G. Zampighi ◽  
M. Kreman
Keyword(s):  
Active Transport ◽  
Transport System ◽  
Plasma Membranes ◽  
Transport Proteins ◽  
Molecular Organization ◽  
Passive Transport ◽  
Concentration Gradients ◽  
Cell Functions ◽  
Natural Concentration ◽  
Active Transport System

The plasma membranes of most animal cells contain transport proteins which function to provide passageways for the transported species across essentially impermeable lipid bilayers. The channel is a passive transport system which allows the movement of ions and low molecular weight molecules along their concentration gradients. The pump is an active transport system and can translocate cations against their natural concentration gradients. The actions and interplay of these two kinds of transport proteins control crucial cell functions such as active transport, excitability and cell communication. In this paper, we will describe and compare several features of the molecular organization of pumps and channels. As an example of an active transport system, we will discuss the structure of the sodium and potassium ion-activated triphosphatase [(Na+ +K+)-ATPase] and as an example of a passive transport system, the communicating channel of gap junctions and lens junctions.

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