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22 results for “Porphyra”
Herbarium specimen image of Porphyra capensis Kütz., part of the collection of Natural History Museum London
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.<br>- A lossless TIFF image from which the JPEG image has been derived.
Herbarium specimen image of Porphyra leucosticta Thuret, 1863, part of the collection of National Museum of Natural History, Paris
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.
Herbarium specimen image of Porphyra C.Agardh, 1824, part of the collection of National Museum of Natural History, Paris
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.
Characterization, functional properties and antioxidant activities of macromolecular extracts isolated from Porphyra yezoensis
<p><em>Porphyra yezoensis</em> is one of the most economical seaweed species in China. Determining how to make full use of mature <em>P. yezoensis </em>and exploring new ways to increase the value of its resources are important subjects of research for the development of the laver breeding industry. In this study, we provide a simple method to comprehensively extract the bioactive substances from <em>P. yezoensis</em>. The characteristics, functional properties and antioxidant activities of two types of biopolymer extract from <em>P. yezoensis</em> were studied and analyzed relatively. Based on the characterization of water-soluble concentrate (WPC) and alkali-soluble concentrate (APC), obtained via chemical analysis, FT-IR, TGA and differential scanning calorimetry (DSC), they both had typical polysaccharide and protein characteristics and steady composition. APC showed higher nitrogen solubility, water holding capacity and foaming ability. APC could not only be used as a protein supplement; it also performs well in improving the properties of foods in terms of water-holding and fat-absorption. The emulsifying activity and oil-holding capacity of WPC were observed to be higher than those of APC; thus, WPC has the potential to be used as an emulsifier. Surprisingly, WPC and APC have radical scavenging capacity in vitro, which broadens the direction of their application.</p>
Figure 4 in Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA
Figure 4: Four possible scenarios that explain colonization of the NW Atlantic from the NE Atlantic that attempt to reconcile data from this study and others that find no sexual reproduction in the NW Atlantic.
Figure 1 in Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA
Figure 1: Collection localities of Porphyra umbilicalis populations in New Hampshire and Maine, USA. Pie charts show frequencies of genotypes in each population collection. The sum of genotype frequencies among all populations is also given.
Figure 2 in Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA
Figure 2: Principal Components Analysis based on Nei's genetic distances among Porphyra umbilicalis genotypes. The genotypes as well as the individuals assayed with the genotype are given (DP =Dover Point, FS=Fort Stark, NL= Nubble Light, QH =Quoddy Head, RSP=Reid State Park, and W =Wiscasset).
Figure 3 in Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA
Figure 3: Principal components analysis based on Nei's unbiased genetic distances among populations of Porphyra umbilicalis in the Gulf of Maine, USA.
Figures 2–4 in More than meets the eye: regional specialisation and microbial cover of the blade of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)
Figures 2–4: Microbial colonisation of blade margins from a wild plant of Porphyra UMbilicalis (Figures 2 and 3) and a cultured descendent (Figure 4) of a wild plant brought into laboratory culture and maintained without antibiotic treatment. Bacteria occur in patches along portions (Figure 2, arrows) but not all (Figure 3, arrows mark neutral spores) of the same wild blade, with much greater density of filamentous bacteria in Figure 2. Cultured blades (Figure 4) have a dense cover of bacteria, including filamentous cyanobacteria (arrows); contemporaneous light microscopic observations found at least three distinct cyanobacteria on these cultured blades, including a probable Calothrix. Wild P. UMbilicalis (n = 6 plants) were collected along a 30-m transect (~5 m apart) in the high intertidal zone at Schoodic Point, Acadia National Park (44.33380000, −68.05805556; 30 December 2016, permit ACAD-2017-SCI-0006). For each plant, one piece of reproductive margin (0.5–1 cm2) and the holdfast were removed with sterile techniques, transported on ice, fixed (4°C) in 5% glutaraldehyde in 0.1 M sodium cacodylate buffer (pH 7.0) containing 0.2 M sucrose, post-fixed in 1% OsO4 in 0.07 M sodium cacodylate, dehydrated in an ethanol series, critical point dried, and sputter-coated with gold-palladium to give a final coating that was 27 nm thick; see Royer 2017 for complete details. All six plants were observed, and representative images are presented. The cultured specimens (Figure 4) were maintained through successive generations by standard techniques (Royer et al. 2018) after collection of the parent on 5 May 2015 at Lubec, Maine.
Figure 12 in More than meets the eye: regional specialisation and microbial cover of the blade of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)
Figure 12: Neutral spore discharged from the neutral sporangium. Note residual mucilage around the bottom half of the neutral spore, the large stellate chloroplast (C), nucleus (N), mitochondria (M), some floridean starch (arrows), and vesicles (V) that may contain mucilage. (See Figures 2–4 for techniques). Scale bar = 1 µm.
Figures 9 and 10 in More than meets the eye: regional specialisation and microbial cover of the blade of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)
Figures 9 and 10: Holdfast structure. (9) TEM of rhizoid cells in holdfast. The holdfast is a thick, flexible structure made of polysaccharide secreted by the pear-shaped rhizoid cells. Note the large amount of floridean starch (arrows) in the pear-shaped end of the rhizoid cell where the large plastid and its pyrenoid are evident. (10) Toluidine blue O-stained holdfast section. The polysaccharide that is secreted includes a thick, metachromatic pad at the base of the holdfast, and the cell walls of rhizoid cells are also metachromatic (arrows). Holdfasts from blades collected at Schoodic Point (ME) in November 2009 were fixed in 2% glutaraldehyde in seawater for 2 h, post-fixed in 4% OsO4, dehydrated in a standard series of ethanol and propylene oxide and embedded in Epon. Holdfasts from additional blades fixed as above were embedded in Spurr's resin (EM Sciences) and semithin sections stained with toluidine blue O (TBO) per Brawley and Quatrano (1979).
Figure 1 in More than meets the eye: regional specialisation and microbial cover of the blade of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)
Figure 1: Anatomy of a typical blade of Porphyra UMbilicalis on the Maine coast. Cartoons show the regions of the blade en face (A) and as a longitudinal cross-section from the margin to the holdfast (M mature spores, N developing neutral spores, V central vegetative area, R rhizoid cells), which is composed of thousands of rhizoid cells. The middle panel and right panels, confocal and brightfield images respectively, show representative areas of four distinct regions of the blade: mature spores – A, B; developing neutral spores – D, E; central vegetative area – F, G; and rhizoid cells – H, I. Note the change in spacing of cells and amount of intervening cell wall (confocal images generated by exciting photosynthetic pigments) and transition in colour from green to red (longitudinal cartoon, brightfield images). Scale bars = 20 µm.
Figures 5–8 in More than meets the eye: regional specialisation and microbial cover of the blade of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)
Figures 5–8: Microbial colonisation of holdfast regions of wild blades. (5) A peeling area of mucilage and/or biofilm shows the intimate association of bacteria within mucilage on a flat surface adjacent to the holdfast, and most of the bacteria are rod-shaped or filamentous. Communities surrounding the holdfast disc contain dense, often encrusting, masses of epiphytic bacteria, but become patchier towards the centre of the blade (Figure 6). (7–8) At higher magnification of the area shown in Figure 6, microbial community diversity is apparent, and it includes bacteria that are structurally similar to some of the baeocyte-producing pleurocapsalean cyanobacteria. White arrow in Figure 7 shows an intact individual, and black arrows in Figures 7 and 8 indicate possible baeocyte/endospore release and mucilage trails from epiphytes on two different wild plants.
Figure 11 in More than meets the eye: regional specialisation and microbial cover of the blade of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)
Figure 11: Neutral spores during discharge through a thick covering of mucilage from the margin of a wild blade (see Figures 2–4 for techniques).
FIGURES 3–8 in Pyropia orbicularis sp. nov. (Rhodophyta, Bangiaceae) based on a population previously known as Porphyra columbina from the central coast of Chile
FIGURES 3–8. Vegetative and reproductive characteristics of Pyropia orbicularis sp. nov. 3. Surface view of vegetative region of the thallus. 4. Surface view of basal, rhizoidal cells. 5. Cross-section of vegetative region of thallus. 6. Trichogyne (arrow). 7. Surface view of zygotosporangia. 8. Fertile region of the blade with packets of developing zygotosporangia (larger and dark) and packets of spermatangia (smaller and colourless).
FIGURE 9 in Pyropia orbicularis sp. nov. (Rhodophyta, Bangiaceae) based on a population previously known as Porphyra columbina from the central coast of Chile
FIGURE 9. Maximum Likelihood (ML) rooted tree for rbcL sequences (876 bp) of Pyropia. Porphyra mumfordii, Porphyra purpurea and Porphyra umbilicalis were used as outgroups. For each node, ML bootstrap values and Bayesian Posterior Probabilities are indicated (ML/BPP). Only high support values (>60) are shown; '-' = clade not observed in the Bayesian Inference. Next to collapsed branches are abbreviated species or sequences names, GENBANK accession numbers have been omitted for brevity but are listed in Table 2. Regions where specimens were collected are indicated within parenthesis: SA = South Atlantic, SP = South Pacific, SO = Southern Ocean. Thick lines highlight the southern hemisphere clade that includes Pyropia orbicularis sp. nov.
FIGURE 11 in Pyropia orbicularis sp. nov. (Rhodophyta, Bangiaceae) based on a population previously known as Porphyra columbina from the central coast of Chile
FIGURE 11. Habit of foliose gametophytes of Pyropia orbicularis sp. nov. collected from Maitencillo beach, Valparaíso, Chile. Scale bar = 2 cm.
FIGURES 1–2 in Pyropia orbicularis sp. nov. (Rhodophyta, Bangiaceae) based on a population previously known as Porphyra columbina from the central coast of Chile
FIGURES 1–2. Pyropia orbicularis sp. nov. 1. Habit of the foliose gametophyte from the upper intertidal zone from Maitencillo beach, Valparaíso, Chile. 2. Holotype specimen of Pyropia orbicularis sp. nov. SGO162483, collected from the upper intertidal zone of Maitencillo beach, Valparaíso, Chile.
FIGURE 10 in Pyropia orbicularis sp. nov. (Rhodophyta, Bangiaceae) based on a population previously known as Porphyra columbina from the central coast of Chile
FIGURE 10. Maximum Likelihood (ML) rooted tree for COI sequences (604 bp) of Pyropia. Porphyra mumfordii, Porphyra purpurea and Porphyra umbilicalis, were used as outgroups. For each node, ML bootstrap values and Bayesian Posterior Probabilities are indicated (ML/BPP). Only high support values (>60) are shown; '-' = clade not observed in the Bayesian Inference. Next to collapsed branches are abbreviated species or sequences names, GENBANK accession numbers have been omitted for brevity but are listed in Table 2.
Identification of miRNA from Porphyra yezoensis by high-throughput sequencing and bioinformatics analysis
GEO Series GSE20534. Pyropia yezoensis. 1 samples. Type: Non-coding RNA profiling by high throughput sequencing.
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