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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.



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


Abbreviation for standard atmosphere.
References in periodicals archive ?
Thus, the same table is to be used to reaches other P and PE routers inside MPLS. However, different routing tables are preserved for dual-stacking [13] [14].
MPLS is independent from both network layer protocols and data link layer media and its infrastructure has minimal core impact to provide IPv6 services [25-26].
As business networks increasingly carry converged traffic (VolP, video, data), MPLS has emerged as the most efficient way to meet the special delivery needs of each type of data.
De esta forma se podra analizar el comportamiento de la calidad de la voz y el video percibido por los usuarios Wimax, al utilizar las bondades que ofrece MPLS en cuando a QoS y poder evaluarlos frente a estructuras anteriormente mencionadas, utilizando el simulador Opnet.
Hatem Bamatraf, Executive VP of Network Development and Operations, du, says MPLS is still the dominant WAN technology and constitutes a major demand from its domestic and multi-national customers.
and Ni L., 2000), se enumeran los problemas generales de diseno de un sistema MPLS para ingenieria de trafico y los inconvenientes que se presentan con los protocolos IGPS, luego se presenta el diseno de un sistema MPLS para una red nacional y basado en las experiencias, se propone un procedimiento generico para el despliegue de un sistema MPLS.
"This project will support the efforts made by ROP in enhancing the communication with different ROP branches all over the Sultanate as the MPLS system will not only provide better speeds but will ensure security and confidentiality of all data transmitted through this network" said Samy Ahmed Al Ghassany chief operating officer at Omantel.
He explained, "MPLS is a switching technology that achieves low latency, high throughput, and an efficient routing scheme for all types of traffic.
One of the core issues in MPLS Networks is the mitigation plan in case of network congestion or network unavailability which is overcome by dynamic path establishment schemes wherein disjoint backup LSP's are established along with the primary LSP and in turn these disjoint paths are near to optimal and provide fruitful results with DiffServ.
The Managed MPLS Service will provide world-class solutions with end-to-end service assurance to enterprises for their business critical networks.
* Analyst house, Ovum, endorse Cable&Wireless' MPLS growth in booming market
"These products have been valuable as we deploy technologies such as VoIP over our MPLS network," says Gary Lewis, manager of data networking and security for Belron US.