Antigenic polymorphism in a wild population of Paramecium aurelia
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چکیده
منابع مشابه
Cortical Ultrastructure of Paramecium Aurelia
Two methods have been devised for the isolation of large quantities of purified pellicles (cortical layers) of Paramecium aurelia. Pellicles isolated by both procedures, when examined by electron microscopy, were found to contain ciliary basal bodies, two types of cortical membranes, ribbons of microtubules, kinetodesmal fibers, and elements of the infraciliary lattice system. By electron micro...
متن کاملThe Process of Transformation of Antigenic Type in Paramecium Aurelia, Variety 4.
initiate it may likewise be unique. At least, gene-initiated plasmagenes can be more readily assimilated into current genetic knowledge and theory which demand ultimate gene control of hereditary capacities. The cells of a multicellular organism are like the cells of a clone of unicellular organism in .their presumed identity of genes. Nevertheless, in both the Metazoan and the Protozoan persis...
متن کاملThe 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 کاملThe classes of endosymbiont of Paramecium aurelia.
The endosymbionts of Paramecium aurelia appear to consist of a number of different Gramnegative bacteria which have come to live within many strains of paramecia. It is not known whether in nature this relationship is mutually beneficial or not. The symbionts from one paramecium may kill other paramecia lacking that kind of symbiont. We identify the following classes of endosymbiotic organisms....
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ژورنال
عنوان ژورنال: Genetical Research
سال: 1960
ISSN: 0016-6723,1469-5073
DOI: 10.1017/s0016672300000082