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What (who) is S4 - definition
WIKIMEDIA DISAMBIGUATION PAGE
S-4; S 4; S.4; Š-4; S4 (disambiguation); Draft:S4
Fourth heart sound
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TYPE OF ABNORMAL HEART SOUND
User:Draeco/Fourth heart sound; S4 sound; 4th heart sound
The fourth heart sound or S4 is an extra heart sound that occurs during late diastole, immediately before the normal two "lub-dub" heart sounds (S1 and S2). It occurs just after atrial contraction and immediately before the systolic S1 and is caused by the atria contracting forcefully in an effort to overcome an abnormally stiff or hypertrophic ventricle.
Sacral spinal nerve 4
![[[Sacrum]], showing bodies in center.](https://commons.wikimedia.org/wiki/Special:FilePath/Gray95.png?width=200 "[[Sacrum]], showing bodies in center.")
SPINAL NERVE OF THE SACRAL SEGMENT
Nervus spinalis S4
The sacral spinal nerve 4 (S4) is a spinal nerve of the sacral segment.American Medical Association Nervous System -- Groups of Nerves
S4 protein domain
INTERPRO DOMAIN
S4 domain
In molecular biology, S4 domain refers to a small RNA-binding protein domain found in a ribosomal protein named uS4 (called S9 in eukaryotes). The S4 domain is approximately 60-65 amino acid residues long, occurs in a single copy at various positions in different proteins and was originally found in pseudouridine syntheses, a bacterial ribosome-associated protein.
Examples of use of S4
1. The STS–117 crew will conduct three spacewalks to activate the S3/S4.
2. The automaker recently rolled out its S4, a drool–inducing high–performance version of its previous low–rung model.
3. They installed the Starboard 3 and 4 (S3/S4) truss segment and conducted four space walks to activate it.
4. And it was on the advice of William, who has a powerful S4 4.2 litre saloon, that Kate recently joined the royal Audi set.
5. Other vehicles in the top 10 include the 1''1 GMC V2500, the 2002 Audi S4 and the 2004 Mercury Marauder.