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5 results for “Tetrahymena pyriformis”
Group Contribution Models for Tetrahymena Pyriformis Toxicity
<p>A data set of several models for Tetrahymena Pyriformis Toxicity (THPT) based on additive schemes (group contribution models).</p> <p>Model building is performed by means of Ambit-GCM software (<a href="http://ambit.sourceforge.net/">http://ambit.sourceforge.net/</a>, <a href="https://doi.org/10.5281/zenodo.1470793">https://doi.org/10.5281/zenodo.1470793</a>)</p> <p>The main goal of the created THPT models is to illustrate Ambit-GCM software usage.</p> <p>Typically biological activity is not well modeled by means of additive schemes. In current modeling setup we demonstrate combination of group contribution scheme with external descriptors.</p>
Seasonality of cyanobacteria and eukaryotes in Lake Geneva and the impacts of cyanotoxins on growth of the model ciliate Tetrahymena pyriformis
<p><span>Toxic cyanobacteria are likely to be favored by global warming and other human impacts, posing significant threats to aquatic ecosystems. While cyanobacterial blooms in eutrophic lakes are widely investigated, the dynamics of cyanobacteria and the effects of their toxins and bioactive metabolites on the plankton communities in mesotrophic and oligotrophic lakes are less well understood. Here we investigated seasonal dynamics of cyanobacteria, eukaryotic algae and cyanotoxins in oligo-mesotrophic Lake Geneva—the largest and deepest lake in western Europe. High-throughput sequencing of the 16S rRNA genes in 143 samples along a water column revealed that Lake Geneva hosts diverse, co-dominant cyanobacterial genera, including <em>Planktothrix</em>, <em>Cyanobium</em>, <em>Pseudanabaena</em>, and <em>Aphanizomenon. </em>The abundance of the <em>mcyA</em> gene marker for microcystin production was highly correlated with total cyanobacteria abundance, obtained from qPCR of the 16S rRNA genes. Targeted LC-HRMS/MS analysis demonstrated peak concentrations of cyanotoxins in September and December 2021 at the deep chlorophyll-a maximum layer, reaching up to 1474 ng/l for anabaenopeptins and 144 ng/l for microcystins. The toxin peaks did not correlate with the abundance or variations in the cyanobacteria or eukaryote community, but they were correlated in time with seasonal lows in the abundances of ciliates (18S rRNA analysis). Laboratory exposure tests demonstrated that growth of the model ciliate <em>Tetrahymena pyriformis </em>was inhibited by Microcystin-RR and Anabaenopeptin A at environmentally relevant concentrations in the ng/l-range, in natural lake water, </span><span>synthetic freshwater, and growth media spiked with the cyanotoxins. Our findings suggest that even low concentrations (in the ng/l-range) of microcystins and anabaenopeptins, reduce growth of ciliates such as <em>T. pyriformis</em> and can be expected to have wider impacts on the eukaryote communities. </span></p>
Raw data Uptake without inactivation of human adenovirus type 2 by Tetrahymena pyriformis ciliates
<p>Tomograms showing HAdV2 particles inside protist slices observed via TEM</p> <p>All raw data (viral concentration, virus removal values, food vacuole count) used in the study</p> <p>R code for MPN quantification in digestion and egestion expriments</p>
Data for Olive et al., Removal of waterborne viruses by Tetrahymena pyriformis is virus-specific and coincides with changes in protist swimming speed, Environmental Science and Technology, 2022 (https://doi.org/10.1021/acs.est.1c05518)
<p>This entry contains the data shown in: Olive et al., <em>Removal of waterborne viruses by Tetrahymena pyriformis is virus-specific and coincides with changes in protist swimming speed,</em> Environmental Science and Technology, 2022 (https://doi.org/10.1021/acs.est.1c05518)</p> <p>Net removal values (log10 C/C0 or log10 N/N0) shown in Figures 1 and 4</p> <p>Raw data used to calculate net removal values in Figure 1</p> <p>Raw removal values shown in Figure 2</p> <p>Raw data for protist movement analysis shown in Figure 3</p> <p>R code used for protist movement analysis (as text file)</p> <p>Raw data for all Supporting Figures (S1-S6)</p>
Single cell RNA-seq reveals that the Vibrio cholerae Mak toxins are required for killing of Tetrahymena pyriformis and for survival in protozoan expelled food vacuoles
GEO Series GSE307158. Vibrio cholerae. 2 samples. Type: Expression profiling by high throughput sequencing.
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