atm

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atmosphere

 [at´mos-fēr]
1. the entire gaseous envelope surrounding the earth and subject to the earth's gravitational field.
2. the air or climate in a particular place. adj., atmospher´ic.
3. a unit of pressure, being that exerted by the earth's atmosphere at sea level; equal to 1.01325 × 105pascals (approximately 760 mm Hg). Abbreviated atm.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

atm

Farlex Partner Medical Dictionary © Farlex 2012

ATM

Ataxia telangiectasia mutated. A checkpoint kinase which transduces genomic stress signals to stop cell cycle progression and promote DNA repair, acting via p53, a tumour suppressor protein. Its cognate gene, ATM (see below), is mutated in ataxia telangiectasia, a rare neurodegenerative disease characterised by ataxia telangiectasias, increased chromosome fragility when exposed to ionising radiation and predisposition to lymphomas.

ATM (Gene)
A gene on chromosome 11q22-q23, which encodes a PI3/PI4 cell-cycle checkpoint kinase that phosphorylates, thereby regulating a broad range of downstream proteins—e.g., tumor suppressor proteins p53 and BRCA1, checkpoint kinase CHK2, checkpoint proteins RAD17 and RAD9, and DNA repair protein NBS1.

Mutated in
Ataxia-telangiectasia.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

atm

Abbreviation for standard atmosphere.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The key building block of the integrated routing/switching backbone, the R/S edge device, integrates cell switching and multiprotocol routing and moves them to the edges of the network.
Together, frame switching and asynchronous transfer mode (ATM) cell switching offer the scaleable performance and flexible connectivity required to take internetworking into the next century.
"When this is supported by cell switching, the ONU allows bi-directional switched data to be sent to the subscriber at speeds of 50 Mbps or more over copper wire.