channel

Transmembrane receptor

...protein-lined pore through the membrane, or ion channel . Upon activation of an extracellular domain by binding of the appropriate ligand, the pore becomes accessible to ions, which then pass through. In other receptors, the transmembrane domains are presumed to undergo a conformational change upon bindin...

Synapse

...atory or inhibitory depends on what type(s) of ion channel conduct the post-synaptic current, which in turn is a function of the type of receptors and neurotransmitter employed at the synapse. Synaptic strength Synaptic strength is the amount of current , or, more strictly, the change in transmembrane...

Signal transduction

... that are ion channels A ligand-activated ion channel will recognize its ligand, and then undergo a str...rs on change of transmembrane potential An ion channel can also open when the receptor is activated by a change in cell potential , that is, the differenc...

Semen

...n the vagina and cervix by creating a less viscous channel for the sperm cells to swim though, and preventing their diffusion out of the semen. Prostaglandin hormones are involved in supressing an immune response by the female against the foreign semen. Semen and transmission of disease Semen is in itse...

Cell membrane

...which relies on a transport protein to provide a channel or bind to specific molecules. This spontaneous process decreases free energy, and increases entropy in a system. Unlike active transport, this process does not involve chemical energy ( ATP ). Active transport Typically moves molecules against t...

Mitochondrion

...orins , which contain a relatively large internal channel (about 2-3 nm ) and allow ions and small molecules to move in and out of the mitochondrion. Large molecules, however, cannot traverse the outer membrane. The inner membrane does not contain porins, however, and is highly impermeable; almost all ...

Mitochondrion

...orins , which contain a relatively large internal channel (about 2-3 nm ) and allow ions and small molecules to move in and out of the mitochondrion. Large molecules, however, cannot traverse the outer membrane. The inner membrane does not contain porins, however, and is highly impermeable; almost all ...

Ion channel

...6 External links Basic features An ion channel is an integral membrane protein or more typicall...ions more or less indiscriminately, the archetypal channel pore is just one or two atoms wide at its narrowest point, it conducts a specific species of ion, su...

Cell membrane

...which relies on a transport protein to provide a channel or bind to specific molecules. This spontaneous process decreases free energy, and increases entropy in a system. Unlike active transport, this process does not involve chemical energy ( ATP ). Active transport Typically moves molecules against t...

Electrophysiology

...o measure the current flowing through a single ion channel and study its behavior. There are different modali... Advantages: Single channels can be recorded and channel properties are not changed. Disadvantages: Poor pharmacology. Whole cell mode. Advantages...

Biophysics

...tanding tumors. Pharmacology and physiology - channel biology, biomolecular interactions, cellular membranes, polyketides. Physics - biomolecular free energy, biomolecular structures and dynamics, protein folding, stochastic processes, surface dynamics. Many biophysical techniques are unique to t...

Bacterial conjugation

...ns coded in the tra or trb loci seem to open a channel between the bacteria. The transfer of DNA always runs from the F-positive towards the F-negative bacterium. If the F-plasmid is free, a nick is produced in one of the circular DNA strands of the plasmid. Then, the single-stranded DNA of the nicke...