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Kappa organism
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Also called:
Kappa Particle
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Kappa organism

biology
Also known as: kappa particle
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Kappa organism, gram-negative symbiotic bacterium found in the cytoplasm of certain strains of the protozoan Paramecium aurelia. These bacteria, when released into the surroundings, change to P particles that secrete a poison (paramecin) that kills other sensitive strains of P. aurelia. The possession of kappa organisms is determined genetically. The kappa bearers, called killers, are immune to the poison that they ultimately unleash.