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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 Marconi Society is also accepting nominations for the 2018 Paul Baran Young Scholars.
Comtek has invested more than PS500,000 in creating its Marconi repair facilities, complete with a full range of Marconi test-rigs, spare parts, and expert engineers.
Marconi was accused just prior to his reappointment of using ethnic slurs in talking about Capt.
Ericsson completed the sale of Marconi in January of this year.
Gross margin fell to 43.3 per cent, from 48.5 per cent in the first quarter of 2005 - the Marconi operating loss was pounds 44.7 million.
On 23 January 2006 Ericsson completed its acquisition of strategic parts of Marconi's telecommunications business and took on about 6,660 Marconi employees.
Ericsson, which picked up Marconi's expertise in network equipment technology through the deal, has yet to decide what it will do with the company name.
The proposals are dependent on the approval of Marconi shareholders at a meeting in December.
Today's deal means Ericsson will take on the Marconi trademark and a range of equipment-based operations, leaving the remainder of the UK company as a services provider to telecoms companies, renamed Telent.
Earlier in the year Marconi slashed 350 jobs at its two plants in the city - New Century Park, Copsewood, and Horizon Park, Foleshill, which is being closed down.
Huawei, a rapidly-expanding firm from southern China, was one of eight suppliers to win work from BT on a pounds 10bn network upgrade ( a contract that eluded Marconi, forcing it to cut more jobs and begin a strategic review.
A number of those operations were sold as Marconi got into shape for a life-saving debt-for-equity swap last year.