English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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 stock 51, two types of particles: smaller bodies ("non-brights") with no detectable internal structure and larger forms ("brights") associated with paramecin activity and containing a highly refractile body (2). In polar view, this inclusion is circular with a central dark core. In side view, the refractile body usually is square (0.5/~) but occasionally is divided into two equal halves by a dark band (-core) that unites with the kappa matrix at either end of the refractile body. Preer's varied methods of staining the refractile body were unsuccessful (2); but the rest of the kappa particle in whole mount preparations of killer animals was reported to be uniformly Feulgen-positive.

The Fine Structure of Kappa in Killer Stock 51 of Paramecium aurelia. Preliminary Observations