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154 results for “cyanobacterium”
Data for: Dissolved organic matter (DOM) offsets the detrimental effects of climate change in the nitrogen fixing cyanobacterium Crocosphaera
<div> <div> <div> <div> <p>Diazotrophs provide a significant reactive nitrogen source in the ocean. Increased warming and stratification may decrease nutrient availability in the future, forcing microbial communities to use dissolved organic matter (DOM). Not depending on reactive nitrogen availability, diazotrophs may be "winners" in a nutrient depleted ocean. However, their ability to exploit DOM may influence this success. We exposed cultures of the widespread <em>Crocosphaera</em> to low (26°C, pH 8.1), moderate (28°C, pH 8.0), and extreme (30°C, pH 7.9) climate change scenarios, under control or DOM-amended conditions. Growth was suboptimal in the low and extreme treatments, and favoured in the moderate treatment. DOM was preferred as a carbon source regardless of the treatment, and promoted N<sub>2</sub> fixation in extreme conditions. This was reflected in the increased expression of photosynthesis genes to obtain energy. DOM provides <em>Crocosphaera</em> with a key ecological advantage, possibly dictating diazotroph-derived nitrogen inputs in the future ocean.</p> </div> </div> </div> </div>
Dataset: Complex effects of chytrid parasites on the growth of the cyanobacterium Planktothrix rubescens across interacting temperature and light gradients
<p>This dataset contains the raw and processed data used in the manuscript "Complex effects of chytrid parasites on the growth of the cyanobacterium Planktothrix rubescens across interacting temperature and light gradients", by Wierenga et al. (preprint: https://doi.org/10.1101/2022.02.24.481659).</p> <p>An explanation of the experiment and measurements is found in the manuscript, and detailed descriptions of the data files are available in the "_file_description.txt" files inside each folder of the dataset. </p>
Fig. 8. A – 18S in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 8. A – 18S rDNA maximum likelihood phylogeny of Angulamoeba. Sequences new for this study are indicated in bold. ML bootstrap values respectively posterior probabilities are shown at the nodes. GenBank accession numbers are given together with the species names. B – LM pictures of Angulamoeba microcystivorans (strains A1WVB (1, 2, 4) and A4WVB (3)) showing the characteristic rusty-colored plasmodium-like mucilage matrix with embedded trophozoites devouring a culture of Microcystis aeruginosa colonies (1–2), multi-vacuolated trophozoites that are seemingly connected by their filopodia (3) and amoeba-flagellates in different stages of transition (4). Scale bars: 200 µm (1), 100 µm (2), 20 µm (3, 4).
Fig. 6. A – 18S in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 6. A – 18S rDNA maximum likelihood phylogeny of Vexillifera, including the Microcystis-associated strain (in bold). ML bootstrap values respectively posterior probabilities are shown at the nodes. GenBank accession numbers are given together with the species names. B – LM pictures of locomotive (1–7, 12–13) and floating (8–11) amoebae. Microcystis cells inside food vacuoles are visible in (1–2) and (13). The arrow in (5) points to a temporal, uroid-like structure sometimes visible during locomotion. Scale bars: 20 µm.
Fig. 4. A – 18S in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 4. A – 18S rDNA maximum likelihood phylogeny of the family Hartmannellidae, including Microcystis-associated strains of Copromyxa (in bold). ML bootstrap values respectively posterior probabilities are shown at the nodes. GenBank accession numbers are given together with the species names. B – LM pictures of C. microcystidis showing locomotive trophozoites (1–7, 10) containing a pronounced hyaline cap (white arrowheads), a vesicular nucleus with globular nucleolus (white arrows), big crystals (black arrows) and Microcystis cells inside food vacuoles (black arrowheads), non-oriented moving trophozoites (8–9, 11), a grazing amoeba capturing a Microcystis cell (12–14), the floating form (15) and a double-walled cyst stage (16). C – LM pictures of C. vandevyveri showing locomotive trophozoites (1, 6–9), trophozoites during non-oriented movement (2–5, 10–12) and floating forms (13–15). Black arrows indicate the presence of small, refractive crystals in the cytoplasm, the white arrow shows the vesicular nucleus with a globular lacuna-containing nucleolus, white arrowheads indicate a pronounced hyaline cap. Ingested Microcystis cells are visible in (9) and (11). Scale bars: 20 µm.
Fig. 3 in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 3. TEM pictures of the scales on the cell surface of Korotnevella jeppesenii (a, c) and K. pelagolacustris (b, d) trophozoites viewed from top (a, b) and side (c, d). Scale bars: 500 nm.
Fig. 2. A – 18S in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 2. A – 18S rDNA maximum likelihood phylogeny of Korotnevella, including Microcystis-associated strains (in bold). ML bootstrap values respectively posterior probabilities are shown at the nodes. GenBank accession numbers are given together with the species names. B – LM pictures of K. jeppesenii (strain A1JEPDK) showing trophozoites in non-oriented movement (1–5), during locomotion (6, 8) and during grazing on Microcystis aeruginosa cells (7) with the arrow indicating a lacuna-containing nucleolus. C – LM pictures of K. pelagolacustris (strains A8WVB (7, 12), A16WVB (6, 8, 11), A21WVB (1, 13), A54WVB (3–5) and A1LMS (2, 9, 10)) showing trophozoites in different stages of non-oriented movement (1–4, 6), the locomotive form (8–12), grazing amoebae with Microcystis cells inside food vacuoles (5, 10), the cyst stage (7) and the floating form (13). Arrows indicate the nucleus with clearly visible nucleolus (in 8, 10, 12). Scale bars: 20 µm.
Fig. 5 in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 5. LM pictures of Schoutedamoeba minuta showing trophozoites in non-oriented movement (a–f) and the limax-shaped locomotive form (g–i). The presence of a pronounced hyaline cap, small adhesive uroidal filaments and tiny granules in the cytoplasm are indicated with white arrowheads, black arrows and a white arrow respectively. Scale bars: 20 µm.
Fig. 7. A – 18S in A Hotspot of Amoebae Diversity: 8 New Naked Amoebae Associated with the Planktonic Bloom-forming Cyanobacterium Microcystis
Fig. 7. A – 18S rDNA maximum likelihood phylogeny of Cochliopodium, including the Microcystis-associated strain (in bold). ML bootstrap values respectively posterior probabilities are shown at the nodes. GenBank accession numbers are given together with the species names. B – LM pictures of locomotive amoebae clearly showing the surrounding hyaline sheet (black arrows) punctuated with microscales (best visible in 8), a few small subpseudopodia (black arrowheads) and trailing adhesive uroidal filaments (white arrows) (1–5), a trophozoite during and just after grazing on Microcystis cells showing a prominent fringe of folded hyaloplasm (white arrowheads) (6–9), the bell-shaped form on colonies of Microcystis aeruginosa (10–11) and floating amoebae (12–13). Scale bars: 20 µm.
Figure 2 in Nitrogen-fixing Cyanothece sp. as a mixotroph and silver nanoparticle synthesizer: a multitasking exceptional cyanobacterium
Figure 2. Disc inhibition zone against MRSA Staphylococcus aureus using (a) gold nanoparticles, (b) silver nanoparticles, and (c) both silver nanoparticles and gold nanoparticles.
Data for: Dissolved organic matter (DOM) offsets the detrimental effects of climate change in the nitrogen fixing cyanobacterium Crocosphaera
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Data from: Dissolved nitrogen uptake versus nitrogen fixation: Mode of nitrogen acquisition affects stable isotope signatures of a diazotrophic cyanobacterium and its grazer
<p>Field studies suggest that changes in the stable isotope ratios of phytoplankton communities can be used to track changes in the utilization of different nitrogen sources, i.e., to detect shifts from dissolved inorganic nitrogen (DIN) uptake to atmospheric nitrogen (N<sub>2</sub>) fixation by diazotrophic cyanobacteria as an indication of nitrogen limitation. We explored changes in the stable isotope signature of the diazotrophic cyanobacterium <em>Trichormus variabilis</em> in response to increasing nitrate (NO<sub>3</sub><sup>-</sup>) concentrations (0 to 170 mg L<sup>-1</sup>) under controlled laboratory conditions. In addition, we explored the influence of nitrogen utilization at the primary producer level on trophic fractionation by studying potential changes in isotope ratios in the freshwater model <em>Daphnia magna</em> feeding on the differently grown cyanobacteria. We show that <em>δ</em><sup>15</sup>N values of the cyanobacterium increase asymptotically with DIN availability, from -0.7 ‰ in the absence of DIN (suggesting N<sub>2</sub> fixation) to 2.9 ‰ at the highest DIN concentration (exclusive DIN uptake). In contrast, <em>δ</em><sup>13</sup>C values of the cyanobacterium did not show a clear relationship with DIN availability. The stable isotope ratios of the consumer reflected those of the differently grown cyanobacteria but also revealed significant trophic fractionation in response to nitrogen utilization at the primary producer level. Nitrogen isotope turnover rates of <em>Daphnia</em> were highest in the absence of DIN as a consequence of N<sub>2</sub> fixation and resulting depletion in <sup>15</sup>N at the primary producer level. Our results highlight the potential of stable isotopes to assess nitrogen limitation and to explore diazotrophy in aquatic food webs.</p>
Figure 2 in Phytoplankton of Šasko Lake and the first record of invasive toxin- producing cyanobacterium Cylindrospermopsis raciborskii Woloszynska) Seenayya et Subba Raju, 1972 in Montenegro
Figure 2. Percentage of algal divisions in phytoplankton composition of Šasko Lake in 2016.
Figure 1 in Phytoplankton of Šasko Lake and the first record of invasive toxin- producing cyanobacterium Cylindrospermopsis raciborskii Woloszynska) Seenayya et Subba Raju, 1972 in Montenegro
Figure 1. Map of Šasko Lake (Montenegro) with marked sampling sites (1-6).
Effects of pH and temperature on the growth, pigment content, and photosynthetic performance of the marine cyanobacterium Arthrospira maxima
<p>Figure 1. Effects of pH and temperature on the relative growth rate (RGR) of <em>Arthrospira maxima</em> cultures. Effects of various pH values (a) and temperatures (b) on RGRs. Data represent mean ± standard deviation (SD; n = 6).</p> <p>Figure 2. Effect of pH on pigment concentrations in <em>A. maxima</em> cultures. Concentrations of chlorophyll <em>a</em> (●) and phycobiliproteins including phycocyanin (■), allophycocyanin (◆), and phycoerythrin (▲). Data represent mean ± SD (n = 6).</p> <p>Figure 3. Effects of different temperatures on chlorophyll a and phycobiliprotein concentrations in <em>A. maxima</em> cultures. Concentrations of chlorophyll <em>a</em> (●), and phycobiliproteins including phycocyanin (■), allophycocyanin (◆), and phycoerythrin (▲). Data represent mean ± SD (n = 6).</p>
Data from: Experimental evolution in the cyanobacterium <i>Trichormus variabilis</i>: increases in size and morphological diversity.
<p>Data deposited in this repository was collected during the investigation entitled; Experimental evolution in the cyanobacterium <em>Trichormus variabilis: </em>increases in size and morphological diversity.</p> <p>Using experimental evolution, we selected the filamentous cyanobacteria <em>T. viariabilis </em>larger size by means of settling selection. The experimental design consisted of 20 replicate populations, ten propagated without selection, and ten populations were transferred by means of settling selection. Settling selection consisted of centrifugation of a 1.5 mL sample of a 72h grown population at 100 g for 30 seconds and transferring the bottom 100 µL of the 1.5 mL microcentrifuge tube to fresh media. The other ten were propagated in batch culture transferring 100 µL of a mixed population to fresh media after 72h growth. The selection experiment was carried out for 45 transfer cycles. </p> <p>Data present the morphology, size, growth, and settling rate of the populations over time, and at the end of the experiment, transfer cycle 45. The population's growth cycle was assessed at transfer 45 over two transfer cycles. Populations were assessed by image analysis of populations' microphotographs. </p> <p>Morphological classification of the evolved morphologies was assessed by a double-blind volunteer panel and by objective analyses of the population's microphotographs. Canonical evolved <em>Cluster </em>and <em>Tangle </em>morphologies were compared using Principal Component Analysis. </p> <p>Lyticase and 2% β-glucuronidase/arylsulfatase treatment of the populations enables the assessment of heritability of the evolved morphologies starting with single cells.</p> <p> </p>
Metadata for: Environmental adaptations by the intertidal Antarctic cyanobacterium Halotia branconii CENA392 as revealed using long-read genome sequencing
<p>Antarctica poses numerous challenges to life such as cold shock, low nutrient concentrations and periodic desiccation over a wide range of extreme temperatures. Cyanobacteria survive this harsh environment having evolved adaptive metabolic plasticity to become the dominant primary producers. The type strain cyanobacterium <em>Halotia branconii</em> CENA392 was isolated from an Antarctic intertidal seashore. The complete circular genome of this strain is presented herein, which was assembled using long sequence reads. The genome encoded some stress-related genes associated with low-temperature adaptation and biosynthesis of mycosporine-like amino acid (MAA) photoprotective compounds. Empirical experimentation demonstrated constitutive production of the MAA porphyra-334 and total carotenoids without exposure to low temperatures or ultraviolet radiation stress. Phylogenetic analysis provided insights on the taxonomic placement and the evolutionary history of some annotated genes. These data exemplify the importance of generating complete quality genome sequences of microorganisms isolated from extreme intertidal environments, facilitating in-depth evaluation of ecological and taxonomic inferences.</p>
Metadata for: Environmental adaptations by the intertidal Antarctic cyanobacterium Halotia branconii CENA392 as revealed using long-read genome sequencing
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A thallus forming N-fixing fungus-cyanobacterium symbiosis from subtropical forests
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Complete genome sequence of Picosynechococcus sp. strain NKBG15041c, a fast-growing marine cyanobacterium
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Allen Brain Atlas
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OpenNeuro
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