CMAS

CMAS may stand for:

See also

CMAS* SCUBA Diver

CMAS * SCUBA Diver or just CMAS * is an entry level diving certification for recreational SCUBA issued by Confédération Mondiale des Activités Subaquatiques (CMAS). CMAS describes the standard as "a diver who is competent in the safe and correct use of all appropriate open water scuba diving equipment in a sheltered water training area [and] is ready to gain open water diving experience in the company of an experienced diver", and advises that teaching of the practical skills "should take place in a swimming pool or confined water with swimming pool like conditions".

The certification allows diving down to 20 metres (66 ft) with a CMAS** or to 40 metres (130 ft) with a CMAS***, but does not include training in night diving or use of nitrox as both skills require higher level certification. CMAS * training is available from two sources. Firstly, from national diving federations affiliated to the CMAS Technical Committee (known as CMAS Federations) using their member diving clubs, their member instructors where the federation is exclusively an instructor organisation or by agreement with independent underwater diving training organizations. Secondly, from specially accredited dive centers known as CMAS Dive Centers (CDC) who use dedicated CMAS training materials and who directly issue CMAS diving certificates.

CMAS (gene)

N-acylneuraminate cytidylyltransferase is an enzyme that in humans is encoded by the CMAS gene.

The enzyme encoded by this gene catalyzes the activation of Neu5Ac to Cytidine 5-prime-monophosphate N-acetylneuraminic acid (CMP-Neu5Ac), which provides the substrate required for the addition of sialic acid. Sialic acids of cell surface glycoproteins and glycolipids play a pivotal role in the structure and function of animal tissues. The pattern of cell surface sialylation is highly regulated during embryonic development, and changes with stages of differentiation. Studies of a similar murine protein suggest that this protein localizes to the nucleus.

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