نتایج جستجو برای: cd 4
تعداد نتایج: 1342035 فیلتر نتایج به سال:
In the elderly, a dramatic shift within the CD4 + T cell population occurs, with an increased proportion having a memory phenotype with markedly decreased responsiveness. To determine what aspects o f the aged phenotype are dependent upon repeated contact with antigen in the environment, we examined CD4 + cells isolated from TC1L Tg n'nce. There is good evidence that no cross-reacting antigens ...
Thymocytes must bind major histocompatibility complex (MHC) proteins on thymic epithelial cells in order to mature into either CD8 + cytotoxic T cells or CD4 + helper T cells. Thymic precursors express both CD8 and CD4, and it has been suggested that the intracellular signals generated by CD8 or CD4 binding to class I or II M H C , respectively, might influence the fate o f uncommitted cells. H...
In this report we summarize our work on real time transcoding implementation combining frame dropping (FD) and DCT coefficient dropping (CD). FD can realize the temporal down sampling resulting in a low frame rate video stream, while CD is implemented by truncating the high frequency AC DCT coefficient bits. The video quality is optimized by adopting the Lagrange optimization. We also specify t...
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