Results 41 to 50 of about 1,515 (185)
Tritium-Induced Effects in Paramecium Aurelia
Experimental Biology and Medicine, 1951 Summary and ConclusionsEffects induced by metabolized radioactive hydrogen (tritium or T) and presumed to be genetic in nature have been measured in Paramecium aurelia. Organisms were allowed to divide 6 to 8 times during 2 days in culture fluid containing T in concentrations varying from 1 to 100 mc per ml. With increasing radioactivity of the medium,
E. L. Powers, Deborah Shefner
openaire +3 more sources
Ecological pleiotropy and indirect effects alter the potential for evolutionary rescue
Evolutionary Applications, Volume 12, Issue 3, Page 636-654, March 2019., 2019 Abstract Invading predators can negatively affect naïve prey populations due to a lack of evolved defenses. Many species therefore may be at risk of extinction due to overexploitation by exotic predators. Yet the strong selective effect of predation might drive evolution of imperiled prey toward more resistant forms, potentially allowing the prey to ...
John P. DeLong, Jonathan Belmaker
wiley +1 more source
Methods in Ecology and Evolution, Volume 6, Issue 2, Page 218-231, February 2015., 2015 Summary Laboratory microcosm experiments using protists as model organisms have a long tradition and are widely used to investigate general concepts in population biology, community ecology and evolutionary biology. Many variables of interest are measured in order to study processes and patterns at different spatiotemporal scales and across all levels ...
Florian Altermatt +15 more
wiley +1 more source
Nuclear events during conjugation in the poorly studied model ciliate Paramecium jenningsi
Water Biology and Security, 2023 Ciliated protists are highly differentiated unicellular eukaryotes that possess special sexual processes (conjugation and autogamy) that rely on their unique nuclear dimorphism, i.e., the presence of both a germline micronucleus (MIC) and a somatic ...
Xue Zhang +11 more
doaj
"Paramecium aurelia and mutation"
Experimental Biology and Medicine, 1904 The ordinary species is Paramecium caudatum; superficially, it resembles P. aurelia. The latter differs from the former in smaller size, in rounded instead of attenuated posterior end, and in the possession of two instead of one micronucleus. The last is generally regarded as the most important difference between the two species. In March, 1905, a pair
openaire +2 more sources
Thermal response of freshwater ciliates: Can they survive at elevated lake temperatures?
Freshwater Biology, Volume 69, Issue 9, Page 1245-1260, September 2024.Abstract Ciliates are a well‐defined, species‐rich, versatile group of heterotrophic and mixotrophic protists. Their response to increased temperature during global warming is critical for the structure and functioning of freshwater food webs. I conducted a meta‐analysis of the literature from field studies and experimental evidence to assess the ...
Thomas Weisse
wiley +1 more source
Competition between mixo‐ and heterotrophic ciliates under dynamic resource supply
Ecosphere, Volume 15, Issue 7, July 2024.Abstract The outcome of species competition strongly depends on the traits of the competitors and associated trade‐offs, as well as on environmental variability. Here, we investigate the relevance of consumer trait variation for species coexistence in a ciliate consumer–microalgal prey system under fluctuating regimes of resource supply.
Sabine Flöder +5 more
wiley +1 more source
Using digital PCR to predict ciliate abundance from ribosomal RNA gene copy numbers
Environmental Microbiology, Volume 26, Issue 4, April 2024.We have developed a digital polymerase chain reaction assay for quantifying the small subunit of the ribosomal RNA gene copies in ciliates. This protocol has proven effective in quantifying the cellular abundance of ciliates in environmental samples. Notably, our method can reliably detect as few as a single cell in a sample.
Megan Gross +3 more
wiley +1 more source
Small‐RNA‐guided histone modifications and somatic genome elimination in ciliates
WIREs RNA, Volume 15, Issue 2, March/April 2024.In ciliates, an ancestral pathway for transposable element repression by small RNAs and histone methyltransferases has evolved into a highly orchestrated process to eliminate unwanted sequences from the genome. Abstract Transposable elements and other repeats are repressed by small‐RNA‐guided histone modifications in fungi, plants and animals.
Thomas Balan +3 more
wiley +1 more source
The Biochemical Status of Particles in Paramecium aurelia [PDF]
Journal of General Microbiology, 1969 SUMMARY: μ particles of stock 540 (syngen 1) of Paramecium aurelia were isolated and studied. Electron microscopy showed that isolated μ particles were very similar to bacteria in fine structure, the general appearance being similar to that found by earlier workers.
openaire +3 more sources