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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 ?
The ATM Forum is working on these issues and has recently drafted specifications for LAN emulation over ATM (as discussed earlier).
We also describe the proposed scheme's extended routing information exchange procedure (NNI routing procedure) and extended connection setup procedure (UNI/NNI signaling procedure) and compare them with the NNI routing [18] and UNI/NNI signaling [1] discussed at the current ATM Forum.
This requires that the ATM downlink ports support the ATM Forum's Private Network Node Interface (PNNI) protocol, the only specified method for load sharing in an ATM environment.
* Multivendor interoperability, hosted by the ATM Forum, has already been demonstrated.
The ATM Forum devised an addressing scheme that specifies three types of formats to use across public and/or private UNIs.
Lucent is already working with the ATM Forum on a set of standards for wireless ATM, but don't expect any products soon.
To prepare for the future, the Frame Relay Forum has also been working with the ATM Forum to ratify a set of inter-networking standards for the two high-speed services.
Based on an ATM Forum protocol development activity known as MPOA (multi-protocol over ATM), the switched router allows IP-based applications to run over ATM switches.
"ATM holds the promise of resolving, once and for all, the issues associated with mixed media networking," Barbier says, "and we believe that it will become the transport medium of choice for both private and public networks once the Voice Over ATM Specification, currently being worked on by the ATM Forum, is finalized in mid-1997.
The result of work by a subgroup in the ATM Forum, MPOA allows Layer 3 network layer routing over ATM and enables companies to leverage ATM's benefits, including Quality of Service and data forwarding.
"ATM equals flexibility," Jill Kaufman of the ATM Forum told a seminar audience.