Risk-neutral measures find extensive application in the pricing of derivatives. Indifference to risk. The risk-neutral investor would be in the middle of the continuum represented by risk-seeking investors at one end, and risk-averse investors at the other extreme. Risk-neutral measures find extensive application in the pricing of derivatives.
Macrophages are highly specialized in removal of dying or dead cells and cellular debris. This role is important in chronic inflammation, as the early stages of inflammation are dominated by neutrophil granulocytes, which are ingested by macrophages if they come of age (see CD31 for a description of this process).
Phagocytosis. White blood cells called phagocytes engulf invaders then destroy them -- a little like eating then digesting the pathogens. This process is called phagocytosis. Macrophages, neutrophils and dendritic cells are the most important phagocytes in your immune system.