Relevant bibliographies by topics / Porphyra

Academic literature on the topic 'Porphyra'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Porphyra"

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Park, Jin-Hee, and Jae-Geun Koo. "Structural Features of Enzymatic Hydrolysate of Porphyran Isolated from Porphyra yezoensis." Korean Journal of Fisheries and Aquatic Sciences 44, no. 6 (December 30, 2011): 630–34. http://dx.doi.org/10.5657/kfas.2011.0630.

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Yamasaki, Takashi, Yuka Miyazaki, and Yuto Kamei. "Isolation of bacteria that decompose major polysaccharides in the cell wall of the marine red alga Porphyra yezoensis and their application for protoplast production." Canadian Journal of Microbiology 44, no. 8 (August 1, 1998): 789–94. http://dx.doi.org/10.1139/w98-070.

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We attempted to screen for bacteria that could decompose major polysaccharides in the cell wall of the marine red alga Porphyra yezoensis from Porphyra-culturing farms to enable simple and high-yield preparation of protoplasts with the crude enzyme from a single bacterial origin. A total of 275 positive bacterial strains were isolated by enrichment culture supplemented with Porphyra powder or xylan. Nine strains were capable of producing protoplasts from Porphyra thalli in a 10-fold concentrated culture broth. These strains were identified as two Flavobacterium spp., one Alteromonas sp., four Acinetobacter spp., and two Vibrio spp. The crude enzymes of these bacteria could release 106 protoplast cells from 0.1 g of Porphyra thalli. The crude enzyme from Alteromonas sp. strain ND137 produced the most protoplasts among the nine strains tested. Moreover, an assay of the crude enzymes from the nine bacterial strains for glycosidase activity against four major polysaccharides (xylan, mannan, porphyran, and cellulose) of P. yezoensis revealed strong decomposing activity against these polysaccharides. Xylanase activity was highest in these glycosidases, suggesting that xylanase might be a very important factor in producing protoplasts from Porphyra thalli.Key words: Porphyra, cell wall, bacteria, decomposing polysaccharide.
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Broom, J. E., W. A. Nelson, W. A. Jones, C. Yarish, R. Aguilar Rosas, and L. E. Aguilar Rosas. "PORPHYRA SUBORBICULATA, PORPHYRA CAROLINENSIS AND PORPHYRA LILLIPUTIANA ‐ THREE NAMES FOR ONE SMALL PORPHYRA." Journal of Phycology 36, s3 (December 2000): 7–8. http://dx.doi.org/10.1046/j.1529-8817.1999.00001-21.x.

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Ryu, Soung-Ryual. "Study on Manufactute of Porphyran Jam and Eppiciency Extraction Method of Porphyran from Porphyra yezoensis." Journal of the Korean Oil Chemists Society 30, no. 3 (September 30, 2013): 504–17. http://dx.doi.org/10.12925/jkocs.2013.30.3.504.

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Cao, Jin, Shi Cheng Wang, Liu Wei Xu, Jia Bing He, and Xi Ming Xu. "Extraction of Porphyran from Porphyra yezoensis for Gel Formulation Preparation." Key Engineering Materials 636 (December 2014): 133–37. http://dx.doi.org/10.4028/www.scientific.net/kem.636.133.

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Porphyran, which structure is similar with carrageenan and agarose, has application potential in drug form developmentas a new pharmaceutical material. Orthogonal experiment was employed to optimizethe porphyran extraction conditions from porphyra yezoensis. The extraction temperature, pH, ratio of liquid to raw material and extraction time were confirmed as 90°C, 11, 30:1 and 3h, respectively.The polysaccharide structure detected by IR spectra was consistent with porphyran, which was suitable for gel formulation preparation.
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Kawamura, Y., K. Yokoo, M. Tojo, and M. Hishiike. "Distribution of Pythium porphyrae, the Causal Agent of Red Rot Disease of Porphyrae spp., in the Ariake Sea, Japan." Plant Disease 89, no. 10 (October 2005): 1041–47. http://dx.doi.org/10.1094/pd-89-1041.

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Distribution of Pythium porphyrae, the causal agent of red rot disease of Porphyra spp., in seafloor sediment was investigated in the Ariake Sea, Japan. A total of 170 samples of each 200 ml of sediment was collected from the seafloor at a total of 13 sites across the sea from 1998 to 2002. Each sample was filtered through two layers of nylon mesh with pore sizes of 100 and 15 μm. The residue on 15 μm mesh was assayed by a soil plating technique using a semiselective medium for P. porphyrae and by polymerase chain reaction (PCR) using species-specific primers. P. porphyrae were detected in 6 out of 13 sites and 2 out of 10 sites surveyed by soil plating and PCR, respectively. The representative isolate of P. porphyrae from the sediment was identical to the Porphyra thallus isolate from the same sea based on pathogenicity to the thallus, morphology, and rDNA internal transcribed spacer sequences. Recovery of P. porphyrae propagules in the sediment was up to 60 CFU per 100 ml of the fresh sample and was consistently higher in May than in the other months. The results suggest that P. porphyrae is distributed in the seafloor sediment in a wide area of the Ariake Sea.
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Tam, Carol E., Kathleen M. Cole, and David J. Garbary. "In situ and in vitro studies on the endophytic red algae Audouinella porphyrae and A. vaga (Acrochaetiales)." Canadian Journal of Botany 65, no. 3 (March 1, 1987): 532–38. http://dx.doi.org/10.1139/b87-068.

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Audouinella porphyrae (Drew) Garbary and A. vaga (Drew) Garbary et al., endophytic species of Acrochaetiaceae growing in Porphyra and Pterosiphonia, respectively, were studied in the field and in culture. Host plants were common at Point No Point, Vancouver Island, from February to October, but endophytes were found only from May to October. Initial infections of both endophytes were in either the basal portions (species of Porphyra) or in the large principal axes (Pterosiphonia bipinnata) of the hosts. Although the endophytes had different morphologies when growing in situ, the species were morphologically similar when grown free of their host. Attempts to reinfect the original hosts and to cross infect the alternate hosts were unsuccessful, and the isolates of Audouinella produced epiphytic plants in mixed culture. In all culture situations plants reproduced asexually by means of recycling generations of monosporangial plants. The two species are considered conspecific, and A. vaga is reduced to synonymy under A. porphyrae.
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Adão, Pedro, João Reboleira, Marco Teles, Beatriz Santos, Nádia Ribeiro, Carlos M. Teixeira, Mafalda Guedes, João Costa Pessoa, and Susana Bernardino. "Enhancement of the Antioxidant and Antimicrobial Activities of Porphyran through Chemical Modification with Tyrosine Derivatives." Molecules 26, no. 10 (May 14, 2021): 2916. http://dx.doi.org/10.3390/molecules26102916.

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The chemical modification of porphyran hydrocolloid is attempted, with the objective of enhancing its antioxidant and antimicrobial activities. Sulfated galactan porphyran is obtained from commercial samples of the red algae Porphyra dioica using Soxhlet extraction with water at 100 °C and precipitation with isopropyl alcohol. The extracted porphyran is then treated with modified L-tyrosines in aqueous medium in the presence of NaOH, at ca. 70 °C. The modified tyrosines L1 and L2 are prepared through a Mannich reaction with either thymol or 2,4-di-tert-butylphenol, respectively. While the reaction with 2,4-di-tert-butylphenol yields the expected tyrosine derivative, a mixture of products is obtained with thymol. The resulting polysaccharides are structurally characterized and the respective antioxidant and antimicrobial activities are determined. Porphyran treated with the N-(2-hydroxy-3,5-di-tert-butyl-benzyl)-L-tyrosine derivative, POR-L2, presents a noticeable superior radical scavenging and antioxidant activity compared to native porphyran, POR. Furthermore, it exhibited some antimicrobial activity against S. aureus. The surface morphology of films prepared by casting with native and modified porphyrans is studied by SEM/EDS. Both POR and POR-L2 present potential applicability in the production of films and washable coatings for food packaging with improved protecting characteristics.
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Kim, Su Yeon, Won Kyong Cho, Hye-In Kim, Seung Hye Paek, Sung Joo Jang, Yeonhwa Jo, Hoseong Choi, Jeong Hun Lee, and Sang Hyun Moh. "Transcriptome Profiling of Human Follicle Dermal Papilla Cells in response to Porphyra-334 Treatment by RNA-Seq." Evidence-Based Complementary and Alternative Medicine 2021 (January 13, 2021): 1–15. http://dx.doi.org/10.1155/2021/6637513.

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Porphyra-334 is a kind of mycosporine-like amino acid absorbing ultraviolet-A. Here, we characterized porphyra-334 as a potential antiaging agent. An in vitro assay revealed that porphyra-334 dramatically promoted collagen synthesis in fibroblast cells. The effect of porphyra-334 on cell proliferation was dependent on the cell type, and the increase of cell viability by porphyra-334 was the highest in keratinocyte cells among the three tested cell types. An in vivo clinical test with 22 participants demonstrated the possible role of porphyra-334 in the improvement of periorbital wrinkles. RNA-sequencing using human follicle dermal papilla (HFDP) cells upon porphyra-334 treatment identified the upregulation of metallothionein- (MT-) associated genes, confirming the antioxidant role of porphyra-334 with MT. Moreover, the expression of genes involved in nuclear chromosome segregation and the encoding of components of kinetochores was upregulated by porphyra-334 treatment. Furthermore, we found that several genes associated with the hair follicle cycle, the hair follicle structure, the epidermal structure, and stem cells were upregulated by porphyra-334 treatment, suggesting the potential role of porphyra-334 in hair follicle growth and maintenance. In summary, we provided several new pieces of evidence of porphyra-334 as a potential antiaging cosmetic agent and elucidated the expression network in HFDP cells upon porphyra-334.
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Nishide, Eiichi, Mitsunori Ohno, Hirosi Anzai, and Naoyuki Uchida. "Studies on porphyran from Porphyra yezoensis UEDA F. narawaensis MIURA. I. Extraction of porphyran from Porphyra yezoensis UEDA F. narawaensis MIURA." NIPPON SUISAN GAKKAISHI 54, no. 12 (1988): 2189–94. http://dx.doi.org/10.2331/suisan.54.2189.

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Dissertations / Theses on the topic "Porphyra"

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Hannach, Gabriela. "Phenotypic plasticity in the red alga Porphyra abbottae : environmental factors influencing light harvesting ability /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/5210.

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Curtis, Bruce Anthony. "A morphological and phylogenetic investigation of Porphyra linearis Greville and Porphyra purpurea (Roth) C. Agardh forms from Nova Scotia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23688.pdf.

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Griffin, Neil John. "Harvest ecology and biodiversity of South African Porphyra." Doctoral thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/10564.

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Bibliography: 140-161 leaves .
Porphyra (Bangiales, Rhodophyta) is the world's most valuable maricultured seaweed, due to its high value as a food crop. The vast majority of Porphyra in South Africa belongs to P. capensis, a morphologically and ecologically plastic taxon apparently endemic to the region. There is no demand for P. capensis as a food crop, as it is unsuitable for the market, and there are no records of its customary use locally. Porphyra capensis is however a potentially highly valuable fodder for the mariculture of abalone (Haliotis midae), and pressure to harvest it has recently increased. This study aims to assess the potential for harvest of Porphyra on the south-western shores of South Africa. There are two main thrusts to this work. The fIrst thrust examines Porphyra as an ecological entity in the region. The second thrust reassesses the taxonomy of Porphyra species in the region.
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Schweikert, Katja, and n/a. "The functional biology of Porphyra sp. in New Zealand." University of Otago. Department of Botany, 2007. http://adt.otago.ac.nz./public/adt-NZDU20080910.114121.

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The intertidal red algal genus Porphyra is found on rocky shores worldwide. In the Northern Hemisphere the genus is well studied but there is a paucity of data on southern hemisphere Porphyra and even less on New Zealand Porphyra. The species� taxonomy has been undergoing revision since the late 1990�s, when it was discovered that the main species P. columbina and P. lilliputana reported for New Zealand were a combination of several endemic species. These species are found from the low to the high intertidal watermark; hence they are exposed to fluctuating stresses such as desiccation, temperature, high light and UV radiation. Algae have evolved a number of mechanisms to adapt to naturally changing increasing abiotic conditions, such as accumulation of screening pigments and changes in antioxidant metabolism during light stress. For terrestrial plants, polyamines (small aliphatic amines) have been shown to be involved in protecting cells from damage under conditions of stress including UV-B radiation; such mechanisms have yet to be identified in algae. The overall aim of this study was to determine the importance of cellular processes in shaping the community structure of Porphyra on a wave-exposed shore on the east coast of the South Island, New Zealand. Porphyra distribution and community structure was assessed by regular monthly monitoring of presence and absence of Porphyra along four transect lines at the site. Enviromnental information was recorded to determine the effects of temperature, light, UV radiation, humidity and wind on Porphyra�s spatial and temporal distribution. Regular tissue samples were taken for species identification by the application of primers, which were specifically designed during this study. P. cinnamomea and Porphyra spec. "ROS 54" were identified as dominant species present almost throughout the year with a pronounced maximum in presence during late winter and spring, and some weeks of absence during April or May. The two dominant species were recorded from the low to the high intertidal shore, but the mid intertidal was identified as the preferred habitat. Other species that were found were rare and only present for a few months in a very restricted area. It was hypothesised that free radical generation and antioxidant metabolism are associated with desiccation tolerance in Porphyra. An attempt was made to investigate the impact of desiccation stress on Porphyra. The extraction process of antioxidants was problematic and no reproducible results could be obtained. It was attempted to investigate the spatial distribution of spores and conchocelis of different Porphyra species in the field, and determine if those found at Brighton Beach are species-specific in their morphology. This indicated that the two main Porphyra species at Brighton Beach not only prefer to occupy the same habitat but that they also have a morphologically similar conchocelis phase. Mechanisms on a cellular level such as polyamine metabolism affected by environmental (abiotic) stresses are related to the alga�s ability to adapt to stress and therefore can have an effect on Porphyra�s distribution along the shore and its presence throughout the year. The depletion of the ozone layer has become an important issue as the effects of increased UV radiation on the environment, especially the intertidal habitat, are revealed. Marine macrophytes possess the main three. polyamines: putrescine, spermidine and spermine of varying levels. For the few species studied, Rhodophyta generally contain higher levels of polyamines than Chlorophyta, while polyamine levels for the one heterokontophyte analysed were between Chlorophyta and Rhodophyta. Levels of the three most common polyamines (putrescine, spermidine, spermine) were determined in P. cinnamomea under controlled UV exposure. Tissue discs were exposed to visible light (PAR), PAR and UV-A or PAR, UV-A and UV-B radiation. Discs exposed to PAR and PAR and UV-A showed little change in polyamine levels over a six day trial period, while discs exposed to PAR, UV-A and UV-B showed a significant increase in free, bound soluble and bound insoluble polyamines over the same period of time. Correspondingly levels of ADC and ODC, two enzymes involved in polyamine synthesis, were measured. ODC levels changed little while ADC levels increased significantly during UV-B treatment, indicating that under UV-B stress polyamines are mainly synthesized via the ADC pathway. The experimental set-up and process of this study has not been applied in macroalgal polyamine research and results obtained are the first indication that increased levels of polyamines are involved in protection and/or protection mechanisms in macrophytic algae to prevent UV-B damage.
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Tala, Fadia. "Fenologia e ecofisiologia das macroalgas Porphyra spp. (Bangiales, Rhodophyta) e Lessonia spp. (Laminariales, Phaeophyceae) na costa norte e central do Chile: variações latitudinais e sazonais." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-31032014-110235/.

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O propósito dos estudos fenológicos é descrever e compreender como o desenvolvimento dos organismos ocorre em resposta às variações ambientais que mudam ciclicamente e como certos fatores estimulam a geração de uma cascata de sinais e reações que abrangem desde mudanças moleculares, bioquímicas e fisiológicas, os que acabam se manifestando como padrões anuais de abundância e reprodução. As mudanças ambientais ocorrem em escalas temporais (diárias, sazonais, interanuais) e espaciais (latitudinal, em profundidade, em altitude) e têm um forte impacto no crescimento e desenvolvimento das espécies, em especial de aquelas com características sésseis. O objetivo deste estudo foi caracterizar os padrões fenológicos (sazonais e latitudinais) de abundância, reprodução, fotossíntese e capacidade antioxidante de dois gêneros de macroalgas de importância ecológica e econômica, Porphyra spp. (rodofícea) e Lessonia spp. (feofícea), distribuídas ao longo da costa norte e centro (25° - 34°S) do Chile. Os resultados mostram que variações sazonais de radiação e latitudinais de temperatura influenciam significativamente as respostas fenológicas e ecofisiológicas das espécies estudadas. No caso de Porphyra spp., o ajuste temporal mais notório envolve um desenvolvimento fenológico anual para a população do norte e perene para as do centro e sul. As características fisiológicas mostraram diminuição na eficiência fotossintetizante, pigmentos (clorofila α, carotenoides e ficobiliproteínas) e proteínas solúveis em primavera-verão, acompanhados por aumento da capacidade antioxidante. No caso de Lessonia e embora a abundância não tenha mostrado uma mudança sazonal nas populações, o ajuste temporal mais notório aconteceu nas características fisiológicas, com diminuição na eficiência fotossintetizante, pigmentos (clorofilas α e c, carotenoides), fenois e capacidade antioxidante durante o verão, acompanhado por aumento na absorptância do talo, ETRmax e NPQ. Estudos sobre as identidades taxonômicas das populações de Porphyra são necessários para distinguir entre possíveis padrões devido à caraterísticas da espécie de possíveis variações morfológicas ou ecotípicas. Estudos das espécies de Lessonia próximas aos seus limites de distribuição biogeográfica poderiam elucidar se as diferenças fenológicas e fisiológicas são devido a padrões dependentes das espécies ou são mascaradas por características ambientais locais. Os estudos fenológicos e as mudanças em nível bioquímico/fisiológico podem subsidiar novos destinos da biomassa produzida ou da matéria prima proveniente de organismos de importância econômica. Além disso, alterações nos padrões fenológicos e ecofisiológicos típicos podem direcionar a compreensão sobre os impactos de câmbios ambientais tais como os câmbios climáticos globais, contaminação e poluição, sobrexploração e as interações e dinâmica entre as populações
The purpose of phenological studies is to describe and understand how the development of the organisms occurs in response to environmental variations which change cyclically and how certain factors stimulate the generation of signals and a cascade of reactions from molecular, biochemical and physiological levels, which at the end manifests annual patterns of abundance and reproduction. Environmental changes occur in time scale (daily, seasonal, interannual) and spatial scale (latitudinal, depth, altitude) and have a strong impact on growth and development of the species, especially those with sessile characteristics. The purpose of this study was to characterize the phenology (seasonal and latitudinal) of abundance, reproduction, photosynthesis and antioxidant capacity of two macroalgae with ecological and economic importance, Porphyra spp. (Rhodophyta) and Lessonia spp. (Phaeophyceae), distributed along the coast north and center (25° - 34°S) in Chile. The results show that seasonal changes in radiation and latitudinal temperature significantly influence the phenological and ecophysiological responses of the species studied. For Porphyra spp., the most notorious temporal adjustment involves an annual phenological development from north population in contrast to perennial populations from central and south. The physiological characteristics showed decrease in photosynthetic efficiency, pigments (chlorophyll a, carotenoids and phycobiliproteins) and soluble proteins in spring-summer, accompanied by increasing in antioxidant capacity. For Lessonia spp., although the abundance showed no seasonal changes between the populations, the most notoriously temporal adjustment occurs in physiological characteristics with decrease in photosynthetic efficiency, pigments (chlorophylls a and c, carotenoids), phenols and antioxidant capacity during the summer, followed by increase in thallus absorptance, ETRmax and NPQ. Studies on the taxonomic identity of Porphyra populations are required to distinguish between possible characteristics due to species-specific patterns from morphological or ecotypes variations. Studies in the species Lessonia near their limits of biogeographical distribution could elucidate whether the phenological and physiological differences are due to patterns species-specific or are masked by local environmental characteristics. The phenological studies and changes in the biochemical/physiological levels can subsidize new destination of biomass production and raw material from organisms economically important. Moreover, changes in typical phenological and ecophysiological patterns can give a light about environmental impacts of alterations such as global climate changes, contamination and pollution, overexploitation and interactions and dynamics between populations.
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McGregor, Bruce Jonathan. "Aspects of the biology of Porphyra (Bangiales, rhodophyta) of the Isle of Man." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317182.

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Yalo, Masande Nicholas. "An investigation of the natural products composition of Porphyra capensis (a red seaweed)." University of the Western Cape, 2017. http://hdl.handle.net/11394/6354.

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Magister Scientiae - MSc (Chemistry)
Plants have been widely used in traditional medicine for a number of ailments, among which may be included infectious diseases such as colds, influenza, chicken pox, TB, etc. as well as lifestyle diseases such as diabetes and cancer. Seaweeds have also been shown to contribute to the maintenance of health through their nutritional and medicinal properties and recently, a great deal of interest has developed towards the isolation of bioactive compounds from marine sources due to their numerous health benefits. Furthermore, marine algae are valuable sources of structurally diverse metabolites with scientifically proven therapeutic claims. Chemical constituents of red seaweed, Porphyra capensis was investigated in this present study along with subsequent brine shrimp lethality assay analysis of the crude extracts. The compounds isolated from the plant were from the hexane (6) and butanol (2) extracts. These compounds were all isolated and purified by various chromatographic techniques, namely silica gel chromatography, Sephadex LH-20 gel as well as C18 reversed phase silica gel. The structures of the isolated compounds were analysed and characterised by NMR, GC-MS, ESI MS and FTIR spectroscopy. Eight compounds were isolated and identified as phytol, desmosterol, 9-eicosenoic acid, 5,8,11,14,17-eicosapentanoic acid, palmitic acid, methyl (E)-hexadec-9-enoate, glycerol and compound 1 (novel compound). All the compounds were isolated from Porphyra capensis for the first time. The hexane, butanol and methanol extracts were found to be non-toxic with the brine shrimp test LC50 value at least two times greater than ?g/ml.
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Oliveira, Mariana Cabral de. "Filogenia de Porphyra spp. (Rhodophyta): sequenciamento do gene nuclear para o RNA da subunidade pequena do ribossomo (rDNA 18S) e estudos morfológicos da fase Conchocelis." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-09082016-164600/.

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O gênero Porphyra (Rhodophyta) apresenta uma considerável importância econômica, sendo extensivamente cultivado e consumido como alimento. O gênero é representado por mais de 70 espécies e apresenta ampla distribuição geográfica, desde regiões tropicais até polares. Sua taxonomia, baseada em poucos caracteres da fase macroscópica do seu ciclo de vida, é ainda bastante problemática. Para tentar entender melhor a taxonomia e a história evolutiva de Porphyra foram utilizadas metodologias de biologia molecular e características da fase conchocelis do ciclo de vida. Verificou-se que caracteres da fase microscópica podem ser utilizados para complementar os conhecimentos taxonômicos tradicionais. Para tentar elucidar a posição filogenética do gênero Porphyra na divisão Rhodophyta e, dentro do gênero, entre espécies do Atlântico, o gene nuclear que codifica para o RNA ribossomal da subunidade pequena do ribossomo (rDNA 18S) foi amplificado através de PCR, clonado e completamente sequenciado. Foram utilizadas três espécies de Porphyra da Nova Escócia (Canadá) e duas de São Paulo (Brasil). As sequências obtidas foram alinhadas com as de alguns eucariontes e de outras algas vermelhas, incluindo uma sequência publicada de \"Porphyra umbilicalis\" da França. As árvores filogenéticas foram construídas através dos métodos de parcimônia, distancia e máxima verossimilhança. As analises mostraram que o gênero Porphyra é monofilético para as cinco espécies estudadas e constitui um dos ramos mais antigos dentro das algas vermelhas já analisados. O gênero Porphyra, subclasse Bangiophycidae, apresentou uma diferença substancial em relação aos gêneros da subclasse Florrideophycidae, sustentando assim, a divisão de Rhodophyta em duas subclasses pela taxonomia tradicional. Entre os eucariontes, Porphyra divergiu ao mesmo tempo que o nuclemorfo de Cryptomonas. O alto grau de divergência genética encontrada entre espécies de Porphyra, além de indicações do registo fóssil, na literatura, sugerem que o gênero é bastante primitivo dentro das algas vermelhas. Surpreendentemente, a sequência publicada para \"Porphyra umbilicalis\" apresentou mais de 99% de identidade com uma espécie de Palmaria que pertence à subclasse Florideophycidae; neste caso, a biologia molecular serviu para comprovar a identificação errônea do exemplar cuja sequência foi publicada. Durante a análise filogenética, verificou-se a ocorrência de um intron do grupo ICI nos genes rDNA 18S de Porphyra spiralis var. amplifolia. Esse intron ocorre na mesma posição que os introns do grupo IC1 nos rDNA 18S dos fungos Pneumocystis carinii, Protomyces inouyei e da alga verde Chlorella ellipsoidea, e apresenta identidade de sequências nos domínios P1 e P2, fora da região conservada, com o intron de Pn. Carinii. Três variantes, diferindo do tamanho da seqüencia do domínio P1, foram observados em três populações com distribuição geográfica diferente. O variante maior pode se auto-processar (\"self-splice\") in vitro. Quadros abertos de leitura estão presentes nos introns, mas não correspondem a nenhum gene conhecido. Introns estão presentes no rDNA 18S de outras espécies de Porphyra, que também podem apresentar variantes do rDNA 18S sem introns
The red algas genus Porphyra has considerable economic importance, and some species are extensively cultivated for human food. The genus is represented by more than 70 species, and occurs worldwide. Its taxonomy, based mainly on morphological characters of the macroscopic phase of its life-cycle is still unsettled. Alternatives to try to understand better the taxonomy and evolutive history of the genus were ascertained. It was verified that characters of the microscopic, filamentous phase, of the life-cycle of Porphyra may be used to complement the traditional taxonomic studies. To try to elucidate the phylogenetic position of Porphyra relative to the other red algae, and within the genus, among isolates from different locations, nuclear-encoded small-subunit ribosomal RNA genes (18S rDNAs) were PCR-amplified, cloned and completely sequenced. Three species of Porphyra from Nova Scotia and two species from Brasil were aligned with 18S sequences of other eukaryotes, including one published sequence of \"Porphyra umbilicalis\" from France. Phylogenetic trees were constructed by parsimony, distance and maximum-likelihood procedures. Analysis of our data revealed that these Porphyra species represented one of the deepest branches so far discovered within red algae. There was a great degree of primary sequence difference between Porphyra (subclass Bangiophycidae), and the other red algae belonging to the subclasses Florideophycidae. These results support the division of red algae into two subclasses by traditional taxonomy. Among eukaryotes Porphyra diverges at the same point as the Cryptomonas nucleomorph. The great among of sequence divergence, and the fossil record suggest that Porphyra, my indeed, be a very primitive red alga. Surprisingly, the 18S RNA sequence of the French \"Porphyra umbilicalis\" does not fit in our Porphyra category; instead, it has more than 99% identity with a species of Palmaria belonging to the subclass Florideophycidae. Therefore it was concluded that \"P. umbilicalis\" with the published sequence was actually a Palmaria palmate that was misidentified. During the phylogenetic analysis it was found that a group IC1 intron occurs in nuclear 18S rRNA genes of Porphyra spiralis var. amplifolia. This intron occurs at the same position of the group IC1 introns in 18S rDNAs of the fungus Pneumocystis carinii, Protomyces inouyei and the green alga Chlorella ellipsoidea, and shares primary-structural identity with the Pn. Carinii intron in domains P1 and P2, outside the conserved core. Three size-variants, differing in amount of optimal sequence in P1, exist and are differentially distributed in geographically distinct populations. The largest variant can self-splice in vitro. Open reading frames are present, but do correspond to known genes. Introns are present in the 18S rDNAs of several other Porphyra species, that may also have intronless rDNA copies
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Dlaza, Thembinkosi Steven. "Development in culture, ecophysiology and nutritional content of three South African Porphyra (Rhodophyta, Bangiales) species." Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10425.

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The first aim of this study was therefore to study the reproductive biology and phenology of three common Porphyra species (Porphyra aeodis Griffin, Bolton et Anderson 1999, Porphyra capensis Katzing 1843 and Porphyra saldanhae Stegenga, Bolton et Anderson 1997), which occur on the west coast of South Africa. The second aim of the study was to investigate, in culture, the ecophysiological responses of the different phases of the life histories of these threes species to various environmental variables. The third aim of this study was to quantify some important aspects of the nutritional composition of these three species and to investigate seasonal variations in these nutrients.
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Luo, Jin-Li. "Porphyrin metabolism in porphyria cutanea tarda." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315308.

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Books on the topic "Porphyra"

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Chrysafis, Andreas C. Porphyra in Purple. UK: Evandia Publishing (UK)Ltd, 2008.

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Porphyra gelia: Mythistorēma. Athēna: Ekdoseis Patakē, 2010.

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Lazaropoulos, Panagiōtēs D. Hē porphyra tou deilinou. Athēna: Ekdoseis Parousia, 1999.

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Vasilikē, Kokkinou, ed. Ē porphyra kai ē elia. Athēna: Psychogios, 1999.

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Henas skouphos apo Porphyra: Mythistorēma. Athēna: Kedros, 1995.

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author, Sahoo Dinabandhu joint, ed. Porphyra: Harvesting gold from the sea. New Delhi: I.K. International Pub. House, 2010.

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Sepheriadou, Anthoula S. Symvolismos kai poiēsē gia to Lampro Porphyra. Thessalonikē: Ekdoseis Kōdikas, 1989.

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Sepheriadou, Anthoula S. Symvolismos kai poiēsē gia to Lampro Porphyra. Thessalonikē: Ekdoseis Kōdikas, 1989.

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Sepheriadou, Anthoula S. Symvolismos kai poiēsē gia to Lampro Porphyra. Thessalonikē: Ekdoseis Kōdikas, 1989.

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Mikami, Koji, and Koji Mikami. Porphyra yezoensis: Frontiers in physiological and molecular biological research. Hauppauge, N.Y: Nova Science Publisher's, 2010.

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Book chapters on the topic "Porphyra"

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Bährle-Rapp, Marina. "Porphyra Umbilicalis Extract." In Springer Lexikon Kosmetik und Körperpflege, 442. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_8242.

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Levine, I. A., and D. Cheney. "North American Porphyra Cultivation." In New Developments in Marine Biotechnology, 141–44. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-5983-9_30.

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Jiang, Zedong, and Tatsuya Oda. "Bioactivities of sulfated polysaccharide porphyran isolated from edible red alga Porphyra yezoensis." In Marine Glycobiology, 279–91. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315371399-21.

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Du Port, François. "Treatment of Porphyra, or the Purple Fever." In The Decade of Medicine or The Physician of the Rich and the Poor, 207–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73715-2_255.

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Candia, A., S. Lindstrom, and E. Reyes. "Porphyra sp. (Bangiales, Rhodophyta): reproduction and life form." In Sixteenth International Seaweed Symposium, 115–19. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4449-0_13.

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Notoya, Masahiro. "’seed’ production of Porphyra spp. by tissue culture." In Sixteenth International Seaweed Symposium, 619–24. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4449-0_76.

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Fujita, Yuji, and Munehisa Saito. "Protoplast isolation and fusion in Porphyra (Bangiales, Rhodophyta)." In Thirteenth International Seaweed Symposium, 161–66. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2049-1_22.

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Amano, Hideomi, and Hiroyuki Noda. "Natural occurrence of denatured phycoerythrin during Porphyra cultivation." In Fourteenth International Seaweed Symposium, 535–39. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1998-6_71.

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Teles, Marco, Pedro Adão, Raul Bernardino, Clélia Afonso, and Susana Bernardino. "Antioxidant Capacity Evaluation of Porphyran Extracted from Porphyra Dioica: Incorporation in Films for Food Packaging." In Proceedings of the 1st International Conference on Water Energy Food and Sustainability (ICoWEFS 2021), 201–9. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75315-3_24.

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Tokuda, Hiroshi. "Acute toxicity of nonpersistent oils on Porphyra and Monostroma." In Twelfth International Seaweed Symposium, 425–29. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4057-4_63.

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Conference papers on the topic "Porphyra"

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Meng, Ying, and Yan Geng. "Study on Extraction of Porphyra Polysaccahride and its Antioxidant Properties." In 2017 International Conference Advanced Engineering and Technology Research (AETR 2017). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/aetr-17.2018.39.

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Liu, Zhiyu, Qian Yang, Shaoyun Wang, and Shaojun Chen. "A study of cadmium, aluminum, and lead accumulations in the purple laver (Porphyra)." In International Conference on Modern Engineering Soultions for the Industry. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/mesi140922.

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Suenaga, Yoshihiro, Yasuo Tsunezawa, Satoru Matsuoka, Sadaaki Yoshimatsu, Kazuhiko Ichimi, Munehiro Fujiwara, Kenichi Yamaga, and Kuninao Tada. "Research on the Discoloration of Nori (Porphyra) and Characteristics of Water Quality Using the Numerical Model." In OCEANS 2006 - Asia Pacific. IEEE, 2006. http://dx.doi.org/10.1109/oceansap.2006.4393973.

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Syaltut Abduh, Mohammad, Alifatqul Maulana, and Sinta Haditsah Zaitun. "Substitution Trial of Red Seaweed (Porphyra) with Green Grass Jelly (Cyclea Barbata Miers) in Making Nori." In 2nd International Conference on Tourism, Gastronomy, and Tourist Destination (ICTGTD 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/ictgtd-18.2018.33.

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Wen Ying and Guo Lei. "Optimization of microwave-assisted extraction conditions of DPPH radical scavenging components from Porphyra yezoensis by response surface methodology." In 2012 International Symposium on Information Technology in Medicine and Education (ITME 2012). IEEE, 2012. http://dx.doi.org/10.1109/itime.2012.6291480.

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Alvarez-Yanamango, Erick, José Cáceres, Fredy Huayta, and Fiorella Sarmiento. "Harina de Porphyra spp: una alternativa para el suministro sostenible de componentes funcionales y nutricionales para la dieta humana." In The 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation, and Infrastructure for Sustainable Cities and Communities”. Latin American and Caribbean Consortium of Engineering Institutions, 2019. http://dx.doi.org/10.18687/laccei2019.1.1.195.

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Li, Z., T. Ohno, XF Lin, WB Zhang, S. Takio, H. Takano, T. Namihira, and H. Akiyama. "The Effect of Pulsed Streamer-Like Discharge in Liquid on Transcriptional Activation of Retrotransposon Genes of a Red Alga, Porphyra Yezoensis." In 2007 IEEE Pulsed Power Plasma Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4345637.

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Ohno, T., Z. Li, XF Lin, W. Zhang, H. Takano, S. Takio, T. Namihira, and H. Akiyama. "The effect of pulsed streamer-like discharge in liquid on transcriptional activation of retrotransposon genes of a red alga, porphyra yezoensis." In 2007 IEEE International Pulsed Power Plasma Science Conference (PPPS 2007). IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4651868.

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Zheng, Gang. "Porphyrin Nanophotonics." In Optical Molecular Probes, Imaging and Drug Delivery. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/omp.2013.mw1c.1.

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Williams, David F. "Imperial Porphyry in Roman Britain." In XI International Conference of ASMOSIA. University of Split, Arts Academy in Split; University of Split, Faculty of Civil Engineering, Architecture and Geodesy, 2018. http://dx.doi.org/10.31534/xi.asmosia.2015/02.28.

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Reports on the topic "Porphyra"

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Kirkham, R. V., and K. P. E. Dunne. World porphyry and porphyry-related deposit database. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/297319.

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Chapman, J. B., A. Plouffe, S. E. Jackson, J. J. Ryan, and T. Ferbey. Mineral markers of porphyry processes: regional and local signatures of porphyry prospectivity. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296487.

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Kirkham, R. V., and K. P. E. Dunne. World distribution of porphyry, porphyry-associated skarn, and bulk-tonnage epithermal deposits and occurrences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211229.

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Kirkham, R. V., and K. P. E. Dunne. World distribution of porphyry, porphyry-associated skarn, and bulk-tonnage epithermal deposits and occurrences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211230.

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Kirkham, R. V., and W. D. Sinclair. Porphyry copper, gold, molybdenum, tungsten, tin, silver. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208014.

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McClenaghan, M. B., M W McCurdy, R G Garrett, C. E. Beckett-Brown, M. I. Leybourne, S. G. Casselman, and P. Pelchat. Heavy mineral and geochemical signatures of porphyry copper mineralization: examples from the Casino porphyry Cu-Au-Mo deposit, Yukon. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/327987.

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Rogers, N., A. Plouffe, J. B. Chapman, M. B. McClenaghan, D. A. Kellett, and R. A. Anderson. Identifying new vectors to hidden porphyry-style mineralisation. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296471.

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McClenaghan, M. B., M. W. McCurdy, R. G. Garrett, C. E. Beckett-Brown, M. I. Leybourne, S. G. Casselman, and P. Pelchat. Mineral and geochemical signatures of porphyry copper mineralization: work in progress for the Casino Cu-Au-Mo-Ag porphyry deposit, Yukon. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/313667.

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Sinclair, W. D., I. R. Jonasson, R. V. Kirkham, and A. E. Soregaroli. Rhenium and other platinum-group metals in porphyry deposits. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2009. http://dx.doi.org/10.4095/247485.

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Chapman, J. B. Deep mineralisation processes within porphyry deposits of the Canadian Cordillera. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/299595.

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