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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.


Farlex Partner Medical Dictionary © Farlex 2012


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
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


Abbreviation for standard atmosphere.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Another change that must be completed before on-line consultation becomes possible is the ongoing but slow replacement of conventional analog telephone lines by much faster asynchronous transfer mode digital phone lines.
Certainly, many enterprises are planning faster networks using Asynchronous Transfer Mode (ATM), but rural areas may not benefit from this technology for a long time.
Basic service or an ISDN line, T1, frame relay or capability for asynchronous transfer mode?
But one intelligence source told Mother Jones that the prize was really France Telecom's advanced ATM (asynchronous transfer mode) switching technology.
The coming thing, according to Mischenko, is Asynchronous Transfer Mode (ATM).
Asynchronous transfer mode (ATM), a high-speed switching system.
If fiber optics and wireless mobility are the drivers of the communications network, asynchronous transfer mode and Internet are the vehicles.
3rd Signal Brigade decided to use a Defense Information System Agency 8MB asynchronous transfer mode link and two commercial T1 lines, during this exercise, to simulate the bandwidth capacity of a Joint Node Network command post node or an ATM Moblie Subscriber Equipment node.
He also outlines the protocol reference models of ISO open systems interconnection, ITU-T asynchronous transfer mode (ATM), and IETF Internet protocol reference models.
The breadth of Cisco 12000 Series interfaces help deliver core and edge applications such as high-speed peering, IP VPN, and Asynchronous Transfer Mode (ATM) and Frame Relay services in a single Cisco 12800 Series chassis.
A major application for the approach is in DSL voice transmission applications and that in contrast with the asymmetric digital subscriber line (ADSL) approach, the SHDSL end user does not require the services of a plain old telephone service/integrated services digital network splitter, since voice signals are transported in asynchronous transfer mode (ATM) using an inband signal.

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