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Free Biology Essay Example

4 Pages

Essay 1. Immune Systems

There are two major groups of foreign substances and microscopic organisms that the immune system of the body could distinguished. The first group are the antigens that are freely moving around the body which includes viruses and foreign cells. The second group are the cells displaying aberrant major histocompatibility complex (MHC) proteins (Brito & Hinton, 1993). These cells includes self-cells which are invaded by the tumor cells and pathogens. In general, humoral immune response recognizes the antigens that are freely circulating around the body while the cell-mediated response recognizes the cells displaying aberrant MHC proteins (Rosenberg & Gallin, 1999).
The humoral Continue reading...

Immunity

Protozoa

Antigen

Host

Aberrant

Human Body

Immune

Rosenberg

Radiation Cataractogenesis Research Paper

7 Pages

Abstract

Radiation cataractogenesis (RCG) is deterministic. It does not occur below a minimum threshold dose. RCG is generally believed as dose-related. Sliney (1986) believed that its severity is also dose-related. The severity increased and the latency decreased as radiation dose increased above that threshold. The lens of the eye is nonvascular and is known to experience no cell loss over its lifetime, indicating that any damage to its cells will not result to the removal of these cells for lack of existing mechanism. Three induction mechanisms were explored (direct, indirect, and oxidative, which separately creates oxidative stress inside the lens Continue reading...

Radiation

Atomic Bomb

Nuclear Weapon

Disaster

Lens

Aliens

Tort Law

Acid