Bacterial Endosymbiosis in Paramecium aurelia: Bacteriophage-like Inclusions in a Kappa Symbiont
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چکیده
منابع مشابه
The classes of kappa in Paramecium aurelia.
Kappas (bacterial symbionts containing R bodies) have been studied in 16 strains of Paramecium aurelia, syngens 2 and 4. All produce toxins capable of killing sensitive paramecia. The first major class, the 51 group (consisting of the kappas of strains 51, 116, and 298), has R bodies which, when the pH is lowered below 6-5, unwind reversibly from the inside to form a tight tube; the outside end...
متن کاملFine Structure of Kappa in Paramecium aurelia
P. aurdia, variety 4, stock 31 killer, mating type VII (51-TK), and the identical organism without kappa, stock 51 sensitive (51.7 S), were grown at 27°C. in a volume of timothy hay infusion inoculated with Aerobacter aerogcne.s; this medium supported two fissions per day. Standard procedures were used to fix, embed, and section the paramecia. In brief, concentrated organisms were fixed by the ...
متن کاملA Nonkiller Resistant Kappa and Its Bearing on the Interpretation of Kappa in Paramecium Aurelia.
IN spite of more than 20 years of investigation by many workers (reviewed by SONNEBORN 1959), kappa-the first-discovered cytoplasmic genetic basis of the killer trait in Paramecium aurelia-still poses intriguing problems. Among them are the correlation of kappa’s visibly distinguishable forms with its diverse properties: abilities to reproduce, to infect, to kill and to confer complete resistan...
متن کاملThe Genotypic Control of Kappa in Paramecium Aurelia, Syngen 4, Stock 51.
HE killer trait in all stocks of Paramecium aurelia which have been investiTgated has been found to depend upon the presence of a cytoplasmic factor, kappa, carried by killers but absent from sensitive animals (SONNEBORN 1943). Kappa is a DNA containing particle of about one micron in size (PREER 1950a; PREER and STARK 1953). When kappa disappears from the cytoplasm of a killer, the animal lose...
متن کاملThe Fine Structure of Kappa in Killer Stock 51 of Paramecium aurelia. Preliminary Observations
The killer trait in Paramecium aurdia depends upon the presence of a cytoplasmic genetic particle, kappa (1). Animals possessing kappa liberate into the culture medium in which they live a poison, paramecin, to which they themselves are resistant; animals lacking kappa are killed by this substance. Stained preparations and phase microscope observations of fixed and unfixed kappa reveal, in stoc...
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ژورنال
عنوان ژورنال: Journal of General Microbiology
سال: 1972
ISSN: 0022-1287
DOI: 10.1099/00221287-71-1-69