The Gall-Peters Projection world map. While originally created by James Gall in 1885, the Gall-Peters Projection came into public consciousness in 1967 when Arno Peters championed it as a more accurate representation of the size of countries. It was considered controversial for calling into question the way the âthird-worldâ is represented.
APC stands for Medicare's ambulatory payment classification. Hospitals use Medicare APC codes to bill the federal government for hospital services given to Medicare and Medicaid patients. Every item, machine or procedure used to care for a Medicare or Medicaid patient has a specialized code that is submitted by the hospital during the billing process.
Antigen-presenting cell. An antigen-presenting cell (APC) or accessory cell is a cell that displays antigen complexed with major histocompatibility complexes (MHCs) on their surfaces; this process is known as antigen presentation. T cells may recognize these complexes using their T cell receptors (TCRs). These cells process antigens and present them to T-cells.