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===O===
===O===
*'''O-antigen''' - part of a lipopolysaccharide, oligosaccharide, used to differentiate between different species of gram-negative bacteria
*'''Obligatory parasite''' - Parasitic for part of its life cycle
*'''Obligatory parasite''' - Parasitic for part of its life cycle
*'''Oligodentrocyte''' - a specialised glial cell of the central nervous system responsible for producing the myelin sheaths found around the neurons
*'''Opportunistic pathogen''' - a commensal pathogen that does not cause disease unless the hosts immune sytem is compromised
*'''Opsonization''' - the process by which a pathogen is marked for ingestion and destruction by a phagocyte usually involving IgG as well as complement factors
*'''Osborndale Ivanhoe''' - name of the bull in which the BLAD mutation was first identified. He lived in the 1950's in the USA
*'''Osmolality''' - Number of osmoles of solute per kilo of solvent
*'''Osmolality''' - Number of osmoles of solute per kilo of solvent
*[[Introduction to Fluid Movement - Physiology#Osmolarity|'''Osmolarity''']] - Number of osmoles of solute per litre of solutions
*[[Introduction to Fluid Movement - Physiology#Osmolarity|'''Osmolarity''']] - Number of osmoles of solute per litre of solutions
*'''Osmole''' - It is a non-SI unit which represents the number of moles of a chemical compound which
*'''Osmole''' - It is a non-SI unit which represents the number of moles of a chemical compound which
*[[Osmosis and Filtration - Anatomy & Physiology|'''Osmosis''']] - The passive transport of water across a semi-permeable membrane
*[[Osmosis and Filtration - Anatomy & Physiology|'''Osmosis''']] - The passive transport of water across a semi-permeable membrane
*'''Osteoclast''' - subpopulation of mononuclear phagocytes, whose main function is the resorbtion of calcified bone
*'''Ouchterlony double immuno diffusion''' - A method of diffusing antigen and antibody in a gel to observe precipitation between the two, considered the gold standart for the detection of extractable nuclear antigens (ENAs). Also known as '''agar gel immunodiffusion'''
*'''Ouchterlony double immuno diffusion''' - A method of diffusing antigen and antibody in a gel to observe precipitation between the two, considered the gold standart for the detection of extractable nuclear antigens (ENAs). Also known as '''agar gel immunodiffusion'''
*'''Oxidative burst''' - caused by the NAD(P)H oxydase, as a sequence of reactions that result in a series of reactive oxygen molecules
===P===
===P===