SPHERICAL ABERRATION
\sfˈɛɹɪkə͡l ˌabəɹˈe͡ɪʃən], \sfˈɛɹɪkəl ˌabəɹˈeɪʃən], \s_f_ˈɛ_ɹ_ɪ_k_əl ˌa_b_ə_ɹ_ˈeɪ_ʃ_ə_n]\
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By DataStellar Co., Ltd
By Willam Alexander Newman Dorland
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In the refraction of light by a lens, an inequality in the degree of convergence of the rays from different portions of the lens, producing a series of images at different focal distances, so called because the character of the a. is due to the fact that the surface of the lens is a segment of a sphere. [Lat.]
By Smith Ely Jelliffe
Word of the day
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.-.