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47 results for “brown algae”
FIGS 19–24 in The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean)
FIGS 19–24. Chlorophyta. (19) Caulerpa nummularia, proliferating from primary, peltate assimilator (HEC 14609 p.p.). (20) Rhipidosiphon javensis (HEC 14763). (21) Udotea sp. (HEC 14759). (22–24) Udotea palmetta (HEC 14817): (22) general morphology of large, fertile specimen; (23) gametangia growing from the blade surface; (24) gametangia growing from the blade margin. Scale bars: 2 mm (19, 20); 1 cm (21, 22); 1 mm (23); 500 mm (24).
FIG. 1. Sampling stations. See table 1 for a in The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean)
FIG. 1. Sampling stations. See table 1 for a list of the stations and their GPS coordinates. Map redrawn from Wells (1988). The outer grey line represents the fringing reef.
FIGS 14–18 in The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean)
FIGS 14–18. Caulerpa. (14) Caulerpa cupressoides var. lycopodium f. elegans, small, elegant specimen (HEC 14691). (15) Caulerpa cupressoides var. lycopodium f. elegans, coarse specimen with richly branched assimilators (HEC 14820). (16) Caulerpa sertularioides f. sertularioides, last order branchlets in a single plane (HEC 14739). (17) Caulerpa sertularioides f. farlowii, last order branchlets in several planes (HEC 14690). (18) Caulerpa webbiana (HEC 14699). Scale bars: 1 cm.
FIGS 25–30 in The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean)
FIGS 25–30. Phaeophyta. (25, 26) Cladosiphon mauritianus (HEC 14789b): (25) general morphology; (26) apical branches. (27, 28) Chnoospora implexa (HEC 14674b): (27) compact form; (28) thin, slender form. (29) Hydroclathrus tenuis (HEC 14756d). (30) Asteronema breviarticulatum, rope-like appearance of intertwined filaments (HEC 14884). Scale bars: 2 cm (25); 1 cm (26–30).
FIGS 7–13 in The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean)
FIGS 7–13. Caulerpa brachypus, variation in the general morphology and margin structure of the assimilators. (7) Large growth form collected in grooves between bumps of coral rubble, frequently branching and with secondary stolons (HEC 14867). (8) Intermediately large growth form with wide assimilators (HEC 14769). (9) Intermediately large growth form with relatively narrow assimilators (HEC 14656a). (10) Typical specimen with simple or scarcely branched assimilators (HEC 14612). (11) Assimilator with smooth margin (HEC 14612). (12) Assimilator with coarsely dentate margin (HEC 14656a). (13) Assimilator with densely dentate margin (HEC 14718). Scale bars: 2 cm (7–10); 1 mm (11–13).
FIGS 2–6 in The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean)
FIGS 2–6. Chlorophyta. (2) Microdictyon tenuius, detail of branching and anastomosing patterns (HEC 14849). (3) Bryopsis pennata var. pennata, branchlets of last order contiguous and in a single plane (HEC 14796 p.p.). (4) Bryopsis pennata var. leprieurii, branchlets of last order interrupted and in a single plane (HEC 14757). (5) Bryopsis pennata var. secunda, branchlets of last order curved in one direction (HEC 14796 p.p.). (6) Chamaedoris delphinii (HEC 14617). Scale bars: 250 mm (2); 5 mm (3–5); 1 cm (6).
Geographic parthenogenesis in the brown alga Scytosiphon lomentaria (Scytosiphonaceae): Sexuals in warm waters and parthenogens in cold waters
<p>Geographic parthenogenesis, a phenomenon where parthenogens and their close sexual relatives inhabit distinct geographic areas, has been considered an interesting topic in evolutionary biology. Reports of geographic parthenogenesis from land and freshwater are numerous, however, this occurrence has been rarely reported from the sea. Brown algae are mostly marine and are thought to include numerous obligate parthenogens; still, little is known about the distribution, origin, and evolution of parthenogens in this group. Here we report a novel pattern of geographic parthenogenesis in the isogamous brown alga<i> Scytosiphon lomentaria</i>. Sex ratio investigation demonstrated that, in Japan, sexual populations grew in the coast along warm ocean currents, whereas female-dominant parthenogenetic populations grew mainly in the coast along a cold ocean current. In the two localities where sexual and parthenogenetic populations were parapatric, parthenogens grew in more wave-exposed areas than sexuals. Population genetic and phylogenetic analyses, including those based on genome-wide single nucleotide polymorphism data, indicated that parthenogens have initially evolved at least twice and subsequent hybridizations between the parthenogens and sexuals have generated multiple new parthenogenetic lineages. The origin of the initial parthenogens is not clear, except that it would not be inter-species hybridization. Interestingly, we found that the production of sex pheromones, which attract male gametes, has been independently lost in the initial two parthenogenetic lineages. This parallel loss of the sexual trait may represent the direct origin of parthenogens, or the regressive evolution of a useless trait under asexuality.</p>
FIGURE 2 in Diversity and phylogeny of the brown alga Lobophora (Dictyotales, Phaeophyceae) in Singapore
FIGURE 2. Phylogenetic reconstruction of Lobophora with Dictyota dichotoma and Padina arborescens as outgroups, based on maximum likelihood (ML) analysis of cox3 alignment. Numeral in parentheses represents number of individuals of the particular species recovered in a clade. Nodal support values indicated as ML/BI/MP when ML or maximum parsimony (MP) bootstrap>0.5, or when posterior probabilities for Bayesian inference (BI)>0.8, at species level and above. Sequences from Singapore are in bold. Lobophora variegata is in red.
FIGURE 4 in Diversity and phylogeny of the brown alga Lobophora (Dictyotales, Phaeophyceae) in Singapore
FIGURE 4. Morphological observations of Lobophora species found in Singapore. Lobophora challengeriae in situ (A), L. challengeriae longitudinal section (B), L. challengeriae transverse section (C). Lobophora lamourouxii in situ (D) (inset: sori), L. lamourouxii longitudinal section (E), L. lamourouxii transverse section (F). Lobophora pachyventera morphotype 1 in situ (G) (inset: morphotype 2), L. pachyventera longitudinal section (H), L. pachyventera transverse section (I). Lobophora sp61 in situ (J), Lobophora sp61 longitudinal section (K), Lobophora sp61 transverse section (L). The metallic scale is 2.5 cm in width (A, D, G, J). Scale bars represent 0.1 mm.
FIGURE 3 in Diversity and phylogeny of the brown alga Lobophora (Dictyotales, Phaeophyceae) in Singapore
FIGURE 3. Phylogenetic reconstruction of Lobophora with Dictyota dichotoma and Padina australis as outgroups, based on maximum likelihood (ML) analysis of psbA alignment. Numeral in parentheses represents number of individuals of the particular species recovered in a clade. Nodal support values indicated as ML/BI/MP when ML or maximum parsimony (MP) bootstrap>0.5, or when posterior probabilities for Bayesian inference (BI)>0.8, at species level and above. Sequences from Singapore are in bold. Lobophora challengeriae sequences from Fong et al. (2019) are prefixed with 'YZT'. Lobophora variegata is in red.
Fig. 1 in Spirornatas A-C from brown alga Turbinaria ornata: Anti-hypertensive spiroketals attenuate angiotensin-I converting enzyme
Fig. 1. Structural representation of 6,6-spiroketal compounds spirornatas A-C isolated from the thallus structure of the marine macroalga Turbinaria ornata.
Fig. 3 in Spirornatas A-C from brown alga Turbinaria ornata: Anti-hypertensive spiroketals attenuate angiotensin-I converting enzyme
Fig. 3. Molecular docking interactions of spirornata A and standard antihypertensive agent captopril with ACE-I. Nearer view of molecular binding interfaces of spirornata A (A) and captopril (B) in the catalytic domain (together with WPD loop) of ACE-I. The dotted lines designated the H-bonding connections with the active site of ACE-I. The studied compounds were drawn in ACD/ChemSketch, and saved as MDL-molfiles (ver-2000), which were changed to PDB layout using Open Babel (GUI ver-2.4.1.) software. The macromolecule was assigned for polar hydrogens with added kollman charge of +7.75. The grid box was built by the method of hit and miss, wherein grid box for ACE-I was taken as x = 57, y = 42, z = 38 (54 Å, 33 Å, 55 Å). The binding site was additionally corroborated by keeping the zinc ion in the optimized protein file. Cygwin-I terminal was applied to run the docking algorithm, and after autodocking experiment, RMSD (Root-Mean-Square Deviation) was evaluated, and Cygwin-II was used for further optimization.
Fig. 2 in Spirornatas A-C from brown alga Turbinaria ornata: Anti-hypertensive spiroketals attenuate angiotensin-I converting enzyme
Fig. 2. (A–C) Key1H–1H COSY and HMBC correlations of spirornatas A-C.1H–1H COSY correlations are depicted with bold-face bonds and the HMBCs as doublebarbed arrows. (D–F) NOESY correlations (designated as single-barbed arrows) of spirornatas A-C. (G–I) Computer-generated models of spirornatas A-C (correlations are depicted with double-sided arrows), respectively using MM2 force-field calculations.
Data from: Evolution and maintenance of haploid-diploid life cycles in natural populations: the case of the marine brown alga Ectocarpus
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Data from: Climate-driven range shifts explain the distribution of extant gene pools and predict future loss of unique lineages in a marine brown alga
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Data from: Increased evolutionary rates and conserved transcriptional response following allopolyploidisation in brown algae
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Geographic parthenogenesis in the brown alga Scytosiphon lomentaria (Scytosiphonaceae): Sexuals in warm waters and parthenogens in cold waters
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Data from: Habitat continuity and stepping-stone oceanographic distances explain population genetic connectivity of the brown alga Cystoseira amentacea
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Data from: DNA variation in the phenotypically-diverse brown alga Saccharina japonica
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FIGURE 1 in Diversity and phylogeny of the brown alga Lobophora (Dictyotales, Phaeophyceae) in Singapore
FIGURE 1. Map of collection sites (denoted by circles), with inset showing the map of Singapore.
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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)
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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.