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1,337 results for “antarctica”
FIGURES 48–56 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 48–56. Luticola murrayi (W. & G.S.West) D.G.Mann. 48. Original illustration from West & West (1911: pl. 26, fig. 129). Light (LM) and scanning electron micrographs (SEM). 49–54. LM of specimens from Green Lake, Cape Royds. 55. SEM of external valve view from population at Green Lake. 56. SEM of internal valve view from a population from a pond on the McMurdo Hut Ridge. LM scale bar = 10 μm. SEM scale bars = 10 μm.
FIGURES 58–74 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 58–74. Luticola muticopsis (Van Heurck) D.G. Mann. 65–68. Original illustration from West & West (1911: pl. 26, figs. 121–124). Light (LM) and scanning electron micrographs (SEM). 58–64 and 69–73. Specimens from Green Lake, Cape Royds, LM. 74. External valve view of specimens from Green Lake, Cape Royds, a confirmed locality in West & West (1911), SEM. LM scale bar = 10 μm. SEM scale bar = 5 μm.
FIGURE 57 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURE 57. Initial cell from BM 34124, an original West & West (1911) slide, LM. Scale bar = 10 μm.
FIGURES 30–47 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 30–47. Luticola laeta Spaulding & Esposito. Light (LM) and scanning electron micrographs (SEM). 30–46. Specimens from a confirmed locality, Canada Stream, Taylor Valley, LM. 47. External valve view from Canada Stream, SEM. LM scale bar = 10 μm. SEM scale bar = 5 μm.
FIGURES 21–29 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 21–29. Luticola gaussii (Heiden) D.G. Mann. 21. Original illustration from West & West (1911: pl. 26, fig. 135). Light (LM) and scanning electron micrographs (SEM). 22–28. Specimens from Coast Lake, Cape Royds, LM. 29. External valve view of specimens from Clear Lake, Cape Royds, a confirmed West & West (1911) locality, SEM. LM scale bar = 10 μm. SEM scale bar = 5 μm.
FIGURES 84–91 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 84–91. Luticola bradyi Kohler sp. nov. Light (LM) and scanning electron micrographs (SEM). 84–89. Specimens from Commonweath Glacier, Taylor Valley, the type population, LM. 90. External valve view, type population, SEM. 91. Internal valve view, type population, SEM. LM scale bar = 10 μm. SEM scale bars = 5 μm.
FIGURES 12–20 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 12–20. Luticola dolia Spaulding & Esposito. Light (LM) and scanning electron micrographs (SEM). 12–19. Specimens from the Onyx River, Wright Valley, LM. 20. External valve view of specimens from the Onyx River, SEM. LM scale bar = 10 μm. SEM scale bar = 2 μm (top).
FIGURES 2–11 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURES 2–11. Luticola austroatlantica Van de Vijver, Kopalová, Spaulding & Esposito. Light (LM) and scanning electron micrographs (SEM). 2–10. Specimens from a confirmed locality, Bowles Creek, Taylor Valley, LM. 11. External valve view of specimens from a confirmed locality, Canada Stream, Taylor Valley, SEM. LM scale bar = 10 μm. SEM scale bar = 5 μm.
FIGURE 1 in The genus Luticola D.G.Mann (Bacillariophyta) from the McMurdo Sound Region, Antarctica, with the description of four new species
FIGURE 1. Map of Antarctica with detail of the McMurdo Sound region (A) along with the locations Wright Valley, Taylor Valley and Cape Royds (B). Image adapted from the US Geological Survey.
FIGURE 3 in Ochrolechia kerguelensis sp. nov. from the Southern Hemisphere and O. antarctica reinstated from the synonymy of O. parella
FIGURE 3. Ochrolechia antarctica (A–B: Imshaug 42271 & Harris; C–D: holotype of Lecanora deceptionis). A and C, macroscopical overview of fertile thalli; B and D, apothecia. Scale bars: A, C = 1 mm; B, D = 500 μm.
FIGURE 2. Ochrolechia kerguelensis. A in Ochrolechia kerguelensis sp. nov. from the Southern Hemisphere and O. antarctica reinstated from the synonymy of O. parella
FIGURE 2. Ochrolechia kerguelensis. A, typical landscape of islands in Golfe du Morbihan, a habitat of the new species (view from Australia Island); B, macroscopical overview of a thallus of ca. 50 cm in diam. on Île Guillou; C–F, morphology of apothecia and thallus [C: field observation, on Grande Terre-Rivière du Sud; D–E: Ertz 18906; F: Ertz 19108]; G, photobiont (trentepohlioid); H, hymenium with one ascus; I–J, ascospores. Scale bars: D–F = 2 mm, G = 10 μm, H= 50 μm, I–J = 25 μm.
FIGURE 1. Phylogenetic relationships among 33 in Ochrolechia kerguelensis sp. nov. from the Southern Hemisphere and O. antarctica reinstated from the synonymy of O. parella
FIGURE 1. Phylogenetic relationships among 33 samples of Ochrolechia (with three Marfloraea species used as outgroup taxa) based on a data set of mtSSU sequences that resulted from a Bayesian analysis using MrBayes. Posterior probabilities are shown above internal branches. Internal branches considered strongly supported are represented by thicker lines. The newly sequenced specimens are in bold. Collecting numbers of the authors or the GenBank accession numbers following the species names act as specimen and sequence identifiers. Species of interest, discussed in the paper, are highlighted in colour. The length of the branch represented by dashed lines was reduced by 50% for editing reason.
FIGURE 1 in Asterochloris sejongensis sp. nov. (Trebouxiophyceae, Chlorophyta) from King George Island, Antarctica
FIGURE 1. Light micrographs and confocal reconstructions of the chloroplast structures in Asterochloris sejongensis sp. nov. (A, B) Parietal lobed chloroplast in young cell. (C, D) Deeply lobed chloroplast; (E, F) crenulated chloroplast; and (G, H) deeply lobed chloroplast with flat lobe ends in the mature cell. (I, J) Aplanospores. Scale bar=5 μm.
FIGURE 4 in Asterochloris sejongensis sp. nov. (Trebouxiophyceae, Chlorophyta) from King George Island, Antarctica
FIGURE 4. Predicted secondary structures of the ITS1 (A) and ITS2 (B) transcripts of Asterochloris sejongensis sp. nov. (2015KGS- 007A) derived by a comparison of the closely related species A. woessiae. Base changes between two Asterochloris genotypes are indicated: the boxed base pair indicates hemi-compensatory base changes (hemi-CBCs); the grey circles indicate single base changes; and the large boxes indicate changes of the ends in the helices. ITS2 transcripts, highly conserved U-U mismatches and UGGU motifs are marked with []. The two star markers in the ITS2 transcript structure indicate specific base changes in the Asterochloris sejongensis sp. nov. (2015KGS-007A) clades.
FIGURE 3 in Asterochloris sejongensis sp. nov. (Trebouxiophyceae, Chlorophyta) from King George Island, Antarctica
FIGURE 3. Bayesian majority role tree based on concatenated ITS rDNA and actin gene sequences. The numbers on each node represent posterior probabilities (left) and bootstrapping values (right). The bold branches indicate strongly supported values (pp=1.00 and ML=100%).
FIGURE 2 in Asterochloris sejongensis sp. nov. (Trebouxiophyceae, Chlorophyta) from King George Island, Antarctica
FIGURE 2. Transmission electron micrographs of 2015KGS-007A. (A) Vegetative cell of 2015KGS-007A. (B) Spore cell of 2015KGS- 007A. (C) Magnified image of thylakoid and chloroplast membrane. (D) Pyrenoglobuli in the chloroplast. Cp, chloroplast; Mt, mitochondria; N, nucleus; Pg, pyrenoglobuli; Th, thylakoid.
FIGURES 1–9 in A new species of Nagumoea (Bacillariophyta) from Antarctica, and a further consideration of the systematic position of the genus
FIGURES 1–9. Nagumoea livingstonensis sp. nov. LM and SEM pictures taken from the type locality (Byers Peninsula, Livingston Island, South Shetland Islands, Sample BY002). 1–4. LM pictures of valve views showing the fibular structure. Fig. 5. Entire frustule in girdle view. Fig. 6. SEM internal detail of the central area showing the typical fibular structure with the connecting siliceous ridges (see arrow) and the proximal raphe endings terminating on the central nodule. Fig. 7. SEM external view of an entire valve. Fig. 8. SEM external view of an entire valve, showing the valve face/mantle junction and the valve mantle. Fig. 9. SEM internal view of an entire valve. The arrows indicate the siliceous connections between the fibulae. Scale bar represents 10 μm for Figs 1–5 and 7, 1 μm for Fig. 6 and 5 μm for Figs 8 & 9.
FIGURES 29–32 in Haslea crucigeroides var. australis, var. nov. (Bacillariophyta), a new marine diatom from southern South America and Antarctica
FIGURES 29–32. SEM images of Haslea crucigeroides var. australis, var. nov. 29. Internal view of a valve centre showing the pseudostauros, the short ridge on a side of the central nodule and the long ridge on the other side. 30. Detail of valve apex in internal view. Note the long ridge covering the raphe until reaching the helictoglossa. 31. Broken valve revealing its two-layer sandwich-type structure; note also its domed shape. 32. Detail of the tegumental and basal layers of the valve (upper and lower side, respectively) joined to each other by saepes (arrow). Basal layer seen on the left of the picture (arrow). Scale bar = 2 μm (Figs 29–31), 0.5 μm (Fig. 32).
FIGURES 22–28 in Haslea crucigeroides var. australis, var. nov. (Bacillariophyta), a new marine diatom from southern South America and Antarctica
FIGURES 22–28. SEM images of Haslea crucigeroides var. australis, var. nov. 22. Part of a frustule in girdle view. Note the external tegumental layer with continuous longitudinal fissures, except on the valve margin (white arrows). The cingulum presents the valvocopula and a copula (black arrows). 23. Valve in external view showing continuous longitudinal fissures, raphe sternum and small central area with the raphe fissures. 24, 25. Apices of the same valve showing the terminal raphe fissures strongly deflected to the same side. 26. Entire valve in internal view. 27. Details of the transverse and longitudinal striae in internal view. Note the rectangular areolar foramina at the valve margin. 28. Detail of the foramina occluded internally by hymenes. Scale bar = 10 μm (Figs 22, 26), 2 μm (Figs 23–25, 27, 28).
FIGURES 5–18 in Haslea crucigeroides var. australis, var. nov. (Bacillariophyta), a new marine diatom from southern South America and Antarctica
FIGURES 5–18. LM images of different valves of Haslea crucigeroides var. australis, var. nov. ordered from lowest to highest length of their apical axis, exemplifying different shapes and sizes. 5. Holotype. Black scale bar = 20 μm. FIGURES 19–21. LM images of the holotype specimen of Haslea crucigeroides (Hustedt) Simonsen. White scale bar = 10 μm (Figs 19, 21). Black scale bar = 20 μm (Fig. 20)
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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