STATIC RANDOM-ACCESS MEMORY
\stˈatɪk ɹˈandəmˈaksɛs mˈɛməɹˌi], \stˈatɪk ɹˈandəmˈaksɛs mˈɛməɹˌi], \s_t_ˈa_t_ɪ_k ɹ_ˈa_n_d_ə_m_ˈa_k_s_ɛ_s m_ˈɛ_m_ə_ɹ_ˌi]\
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(SRAM) Random-access memory in which each bit ofstorage is a bistable flip-flop, commonly consisting ofcross-coupled inverters. It is called "static" because itwill retain a value as long as power is supplied, unlikedynamic random-access memory (DRAM) which must be regularlyrefreshed. It is however, still volatile, i.e. it will loseits contents when the power is switched off, in contrast toROM.SRAM is usually faster than DRAM but since each bit requiresseveral transistors (about six) you can get less bits of SRAMin the same area. It usually costs more per bit than DRAM andso is used for the most speed-critical parts of a computer(e.g. cache memory) or other circuit.
By Denis Howe
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Proto Oncogene Proteins c erbB 2
- cell surface protein-tyrosine kinase that is found to be overexpressed in significant number adenocarcinomas. It has extensive homology can heterodimerize EGF EPIDERMAL GROWTH FACTOR), 3 receptor (RECEPTOR, 3) and the 4 receptor. Activation of erbB-2 receptor occurs during heterodimer formation with a ligand-bound erbB family members. EC 2.7.11.-.