Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
45
datasets available to search
ShareScore release 0.9.0
Dataset results
45 results for “Paramecium”
Fig. 17–22 in New Paramecium (Ciliophora, Oligohymenophorea) congeners shape our view on its biodiversity
Fig. 17–22 Nuclear reorganization in P. boetschlii sp. nov. during conjugation. 17 Early micronuclear migration. 18 Prophase of the first meiotic division of the micronucleus. 19 The third synkaryon division in exconjugant. Four spindles of synkaryon derivates are marked by wedgetailed arrows; three of the four products indicated by large arrows (micronuclear anlagen) and by arrowheads (macronuclear anlagen). 20–21 Exconjugant cell with eight products of synkaryon division and fragments of the old macronucleus (bold arrow) under different magnification. 22 Exconjugant cell with more developed macronuclear anlagen. Bars 15 μm (17), 10 μm (18, 19), 30 μm (20), 15 μm (21, 22)
Data from: The effects of inducible defenses on population stability in <em>Paramecium aurelia</em>
Open the record for dataset details and reuse information.
Data from: Reverse evolution: selection against costly resistance in disease-free microcosm populations of Paramecium caudatum
Evolutionary costs of parasite resistance arise if genes conferring resistance reduce fitness in the absence of parasites. Thus, parasite-mediated selection may lead to increased resistance and a correlated decrease in fitness, whereas relaxed parasite-mediated selection may lead to reverse evolution of increased fitness and a correlated decrease in resistance. We tested this idea in experimental populations of the protozoan Paramecium caudatum and the parasitic bacterium Holospora undulata. After 8 years, resistance to infection and asexual reproduction were compared among paramecia from (i) infected populations, (ii) uninfected naive populations and (iii) previously infected, parasite-free (recovered) populations. Paramecia from infected populations were more resistant (+12%), but had lower reproduction (-15%) than naive paramecia, indicating an evolutionary trade-off between resistance and fitness. Recovered populations showed similar reproduction to naive populations; however, resistance of recently (<3 years) recovered populations was similar to paramecia from infected populations, while longer (>3 years) recovered populations were as susceptible as naive populations. This suggests a weak, convex trade-off between resistance and fitness, allowing recovery of fitness, without complete loss of resistance, favouring the maintenance of a generalist strategy of intermediate fitness and resistance. Our results indicate that (co)evolution with parasites can leave a genetic signature in disease-free populations.
Data from: Evolutionary rescue and local adaptation under different rates of temperature increase: a combined analysis of changes in phenotype expression and genotype frequency in Paramecium microcosms
Evolutionary Rescue (ER) occurs when populations, which have declined due to rapid environmental change, recover through genetic adaptation. The success of this process and the evolutionary trajectory of the population strongly depend on the rate of environmental change. Here we investigated how different rates of temperature increase (from 23°C to 32°C) affect population persistence and evolutionary change in experimental microcosms of the protozoan Paramecium caudatum. Consistent with theory on ER, we found that those populations experiencing the slowest rate of temperature increase were the least likely to become extinct and tended to be the best adapted to the new temperature environment. All high-temperature populations were more tolerant to severe heat stress (35°C, 37°C), indicating a common mechanism of heat protection. High-temperature populations also had superior growth rates at optimum temperatures, leading to the absence of a pattern of local adaptation to control (23°C) and high-temperature (32°C) environments. However, high-temperature populations had reduced growth at low temperatures (5-9°C), causing a shift in the temperature niche. In part, the observed evolutionary change can be explained by selection from standing variation. Using mitochondrial markers, we found complete divergence between control and high-temperature populations in the frequencies of six initial founder genotypes. Our results confirm basic predictions of ER and illustrate how adaptation to an extreme local environment can produce positive as well as negative correlated responses to selection over the entire range of the ecological niche.
Data from: Population-level dynamics in experimental mixed infections: evidence for competitive exclusion among bacterial parasites of Paramecium caudatum
Parasites frequently share their host populations with other parasites. However, little is known about how different parasites respond to competition with diverse competitor species in the within-host and between-host environments. We explored the repeatability of competition by simultaneously exposing microcosm populations of the ciliate Paramecium caudatum to pairs of parasites from the Holospora species complex (H. undulata, H. caryophila and H. obtusa) affected the persistence and prevalence of each compared to single infections, across three host genotypes. Three weeks post-inoculation we identified the presence of each parasite using fluorescence in situ hybridisation (FISH). Competitive exclusion (62/72) was more common than co-existence (10/72) in populations inoculated with 2 parasites. There was a clear pattern of competitive superiority, with H. caryophila persisting in all doubly inoculated populations (with either H. undulata or H. obtusa), and H. undulata tending to exclude H. obtusa. This mirrored infection success in single infections, with H. caryophila having a higher infection prevalence in single inoculations, followed by H. undulata then H. obtusa. The probability of persistence in co-inoculations did not change across the different host genotypes, and prevalence was the same as in single infections. Our results are consistent with superinfection models, which assume the competitive exclusion of parasites upon contact within the same host. Furthermore, such non-random competitive epidemiological dynamics, where one parasites always wins, may be of interest for public health management, especially if the winning parasite is avirulent, as is seemingly the case here.
Fig. 1. Phylogram constructed for 31 in Paramecium tredecaurelia: A Unique Non-Polymorphic Species of the P. aurelia spp. Complex (Oligohymenophorea, Ciliophora)
Fig. 1. Phylogram constructed for 31 strains of the P. aurelia species complex (including the 5 studied strains of P. tredecaurelia) and two strains of P. multimicronucleatum used as an outgroup. The trees were constructed on the basis of a comparison of sequences from the ITS1- 5.8S-ITS2-5'LSU rDNA fragment (A), COI (B), and CytB (C) using the Bayesian inference method. Bootstrap values for neighbor joining, maximum parsimony analysis, maximum likelihood, and posterior probabilities for Bayesian inference are shown. Bootstrap values smaller than 50% (posterior probabilities <0.50) are not shown. Dashes represent no bootstrap or posterior value at a given node. All positions containing gaps and missing data were eliminated. Phylogenetic analyses were conducted using MEGA 5.0 (NJ/MP/ML) and MrBayes 3.1.2 (BI).
Data from: Reverse evolution: selection against costly resistance in disease-free microcosm populations of Paramecium caudatum
Open the record for dataset details and reuse information.
Data from: Evolutionary rescue and local adaptation under different rates of temperature increase: a combined analysis of changes in phenotype expression and genotype frequency in Paramecium microcosms
Open the record for dataset details and reuse information.
Data from: Population-level dynamics in experimental mixed infections: evidence for competitive exclusion among bacterial parasites of Paramecium caudatum
Open the record for dataset details and reuse information.
Expression data for Paramecium sexually reactive cells from type 7 and type 8
GEO Series GSE43436. Paramecium tetraurelia. 2 samples. Type: Expression profiling by genome tiling array.
Paramecium tetraurelia trichocyst exocytosis recovery
GEO Series GSE17930. Paramecium tetraurelia. 12 samples. Type: Expression profiling by genome tiling array.
Paramecium tetraurelia autogamy series 2 (ND7-silenced and control cells)
GEO Series GSE18002. Paramecium tetraurelia. 11 samples. Type: Expression profiling by genome tiling array.
Paramecium tetraurelia autogamy series 3
GEO Series GSE17998. Paramecium tetraurelia. 6 samples. Type: Expression profiling by genome tiling array.
Paramecium tetraurelia autogamy series 1
GEO Series GSE17996. Paramecium tetraurelia. 12 samples. Type: Expression profiling by genome tiling array.
Paramecium tetraurelia autogamy series 4
GEO Series GSE17997. Paramecium tetraurelia. 4 samples. Type: Expression profiling by genome tiling array.
Gene expression in a paleopolyploid: a transcriptome resource for the ciliate Paramecium tetraurelia
GEO Series GSE32256. Paramecium tetraurelia. 58 samples. Type: Expression profiling by array; Expression profiling by genome tiling array.
Paramecium tetraurelia reciliation (log phase)
GEO Series GSE12620. Paramecium tetraurelia. 8 samples. Type: Expression profiling by array.
Transcriptome analysis, Paramecium tetraurelia ICL (as a control) vs. Rdr3 silencing
GEO Series GSE59390. Paramecium tetraurelia. 6 samples. Type: Expression profiling by array.
Fig. 36 in New Paramecium (Ciliophora, Oligohymenophorea) congeners shape our view on its biodiversity
Fig. 36 SSU rDNA tree topology. Phylogenetic reconstruction of the genus Parameciom based on 18S-rDNA sequences inferred by Bayesian Inference analysis. The alignment contained 49 taxa and 1640 sites including gaps. Sequences of new or cryptic species characterized within this study are shown in boldface. Sequences of other Peniculida served as outgroup. Nombers at nodes (occasionally indicated by an arrow) represent support values for the Bayesian Inference and Maximum Likelihood
Fig. 23–26 in New Paramecium (Ciliophora, Oligohymenophorea) congeners shape our view on its biodiversity
Fig. 23–26 Morphology of BEocandidatos P. germanicum^. 23 Living cell with visible food vacuoles (FV) and macronucleus (MA). DIC contrast. 24 Ventral view of silver nitrate-impregnated cell with cytoproct (C). 25 Nuclear apparatus of the Feulgen-stained cell with indications for micronuclei (small arrows). 26 Nuclear apparatus. Feulgen-stained cell, large magnification. Bars 40 μm (23), 35 μm (24), 4.5 μm (25), 6 μm (26)
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.