Definition
In biology, Kappa organism or Kappa particle refers to inheritable cytoplasmic symbionts, occurring in some strains of the ciliate Paramecium. Paramecium strains possessing the particles are known as "killer paramecia". They liberate a substance also known as paramecin into the culture medium that is lethal to Paramecium that do not contain kappa particles. Kappa particles are found in genotypes of Paramecium aurelia syngen 2 that carry the dominant gene K.
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AbiogenesisAnimalApicoplastArchaeaArtificial cellAvsunviroidaeBacteriaBacteriomeBiological dark matterCaedibacter taeniospiralisCancer cellCell (biology)Cell divisionChloroplastChromoplastChromosomeCiliateCircular chromosomeClonally transmissible cancerCoacervateColicinCosmidCytoplasmicDNA replicationDNA transposonDNA virusDefective interfering particleDouble-stranded RNA virusesDsDNA-RT virusEarliest known life formsEndogenous retrovirusEndogenous viral elementEndosymbiontEukaryoteExtrachromosomal DNAFertility factor (bacteria)FeulgenFosmidFungal prionFungusGeneGene duplicationGenomeGenomic islandGenotypeGerontoplastGiant virusGiemsaGroup II intronGroup I catalytic intronHeLaHelper dependent virusHelper virusHorizontal gene transferHydrogenosomeIncertae sedisInterspersed repeatJeewanuLast universal common ancestorLeucoplastLifeLinear chromosomeMediLexiconMicrobiologyMitochondrionMitosomeMobile genetic elementsMobilomeModel lipid bilayerNanobacteriumNanobeNitroplastNon-cellular lifeNon-coding DNANucleic acidNucleoproteinOrganellesOrganismOrigin of replicationParakaryonParameciumParamecium aureliaPhagemidPlantPlasmidPlastidPospiviroidaePrionProphageProteinoidProtistProtocellProvirusR-factorRNA-dependent RNA polymeraseRNA virusRNA worldR bodiesRepeated sequence (DNA)Replicon (genetics)RetrotransposonRetrovirusRetrozymeRibozymeSatellite (biology)Secondary chromosomeSelf-replicationSubviral agentsSulphobesSymbiontsSynthetic virologyTandem repeatTi plasmidTransposable elementTranspovironTrophosomeViral vectorViroidViromeVirophageVirulence factorVirusVirusesVirusoid
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