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Dissertations / Theses on the topic 'Mycosporine'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Kuffner, Ilsa Boysen. "The Effects of Ultraviolet Radiation on Reef Corals and the Sun-Screening Role of Mycosporine-like Amino Acids." Thesis, University of Hawai'i, Honolulu, 1999. http://hdl.handle.net/10125/15319.

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Shallow-dwelling scleractinian corals live in high irradiance environments where they are exposed to large fluxes of ultraviolet radiation (UVR, 280 - 400 nm). A suite of UV-aborbing compounds, know as mycosporine-like amino acids, is found within the tissues of coral-algal symbioses and may perform a sun-screening role. The seasonal variation in MAA concentration was investigated for two corals in Kaneohe Bay, Hawai'i, Porites compressa and Montipora verrucosa. Regressions of MAA concentration and the amount of UVR measured prior to collection date were not significant for total MAA concentra

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2

Frame, Elizabeth R. "Mycosporine-like amino acids (MAAs) in bloom-forming phytoplankton : the influence of nitrogen, ultraviolet radiation and species composition /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3144314.

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3

Whitehead, Kenia Luz. "Biogeochemistry of mycosporine-like amino acids (MAAs) : a new perspective on UV-absorbing compounds via liquid chromatography-mass spectrometry /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10981.

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4

Nguyen, Thi Thu Tram. "Screening of mycosporine-like compounds in the dermatocarpon genus : phytochemical study of the lichen dermatocarpon luridum (WITH.) J.R Laundon." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S177/document.

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Un criblage phytochimique à partir de quatre lichens saxicoles hydrophiles du genre Dermatocarpon a mis en évidence la présence inattendue de composés de type mycosporines dans ces chlorolichens. Leur présence a été confirmée dans des échantillons historiques d'herbiers couvrant une période de plus de 170 ans. Leur teneur était comprise entre 0,1 et 1,4 mg/g de lichen sec. Trois mycosporines ont été isolées de Dermatocarpon luridum collecté en Bretagne sur des rochers d'eau vive: deux mycosporines natives, la mycosporine glutaminol et la mycosporine glutamicol ainsi qu'un artéfact d'isolement,

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5

Harb, Talissa Barroco. "Análise do desempenho fisiológico e da composição química de Pterocladiella capillacea (Rhodophyta, Gelidiales) submetida a diferentes irradiâncias." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-19122016-121313/.

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A luz age influenciando direta e indiretamente aspectos fisiológicos das macroalgas como crescimento, desenvolvimento, reprodução, desempenho fotossintetizante e aclimatação. A radiação fotossinteticamente ativa (PAR) é a faixa de luz visível compreendida entre 400 e 700 nm, usada pelos organismos para execução da fotossíntese. Os costões rochosos estão sujeitos a uma variabilidade constante de luz que impõe às macroalgas, o desenvolvimento de eficientes estratégias com o objetivo de otimizar a fotossíntese e manter seu crescimento, além de evitarem a fotoinibição e o fotodano. O principal obj

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6

Gravem, Sarah A. "SEX AND MICROHABITAT INFLUENCE THE ALLOCATION OF MYCOSPORINE-LIKE AMINO ACIDS TO TISSUES IN THE PURPLE SEA URCHIN, STRONGYLOCENTROTUS PURPURATUS." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/163.

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Field surveys of Strongylocentrotus purpuratus demonstrated that concentrations of natural sunscreens, mycosporine-like amino acids (MAAs), were higher in females than males for both gonadal and epidermal tissues, increased in ovaries as spawning season approached, and were influenced by the sea urchins’ microhabitat. Sea urchins occupying burrows, or “pits”, had lower concentrations of MAAs than those outside pits, suggesting a trade-off between physical and UV protection. Overall, UV irradiance did not influence MAA accumulation in gonadal tissues. However, males increased their allocation o

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7

Elliott, Ashley. "UV-Protective Compounds in Sea Ice-Associated Algae in the Canadian Arctic." Marine Ecology Progress Series, 2015. http://hdl.handle.net/1993/31237.

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Marine phytoplankton are known to produce UV-absorbing compounds (UVACs) for protection against UV radiation. To assess whether the same strategy applies to sea ice-associated algal communities, MAAs were measured in algae associated with surface melt ponds, sea ice, sea ice−water interface, and underlying seawater in a coastal bay of the Canadian Arctic Archipelago during the 2011 spring melt transition. Six UVACs were detected as the spring melt progressed, namely shinorine, palythine, and porphyra-334 and three unknowns (U1, U2 and U3). U1 was most likely palythene, another MAA. The molecul

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8

Kräbs, Gudrun. "Wavelength dependent induction and biosynthesis of UV-absorbing mycosporine-like amino acids in marine macroalgae = Wellenlängen-abhängige Induktion und Biosynthese von UV-absorbierenden Mykosporine-ähnlichen Aminosäuren in marinen Makroalgen /." Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung, 2004. http://www.gbv.de/dms/bs/toc/389858625.pdf.

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9

Ayoub, Lore Michele. "Can colored dissolved organic material protect coral reefs by reducing exposure to ultraviolet radiation?" [Tampa, Fla.] : University of South Florida, 2009. http://digital.lib.usf.edu/?e14.2918.

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10

Marques, Luiza Grecco e. "Aminoácidos tipo micosporina: novas metodologias e distribuição em macroalgas da costa brasileira." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-20072015-155636/.

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A radiação ultravioleta (RUV) causa efeitos deletérios em ecossistemas aquáticos e terrestres. Um dos mecanismos de defesa criados pelos organismos para evitar estes danos é o acúmulo de compostos que absorvem RUV, dentre os quais os aminoácidos tipo micosporina (MAAs, do inglês mycosporine-like amino acids) representam uma classe importante. As MAAs são substâncias solúveis em água caracterizadas pela presença de uma unidade ciclo-hexenona ou ciclo-hexenimina conjugada com nitrogênio substituído por um aminoácido, aminoálcool ou grupo amino, apresentando absorção máxima entre 308 e 362 nm e a

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11

Torres, Priscila Bezerra. "Caracterização química e atividades biológicas de algumas espécies nativas de Gracilaria de importância econômica." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-23052017-142455/.

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Muitas espécies de Gracilaria são de importância econômica devido à exploração do ágar e, em menor escala, por serem consumidas diretamente na alimentação. Recentemente pesquisas têm mostrado um bom potencial biológico dessas espécies, porém com pouca investigação relacionada a identificação das substâncias bioativas. Sob esta perspectiva, o objetivo geral deste estudo foi investigar os componentes químicos majoritários e avaliar o potencial biológico e nutricional de três espécies nativas obtidas no litoral do nordeste brasileiro: Gracilaria birdiae E. M. Plastino & E. C. Oliveira Gracilaria

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12

Favre-Bonvin, Jean. "Structure et biosynthèse des mycosporines." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37597553q.

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13

Favre-Bonvin, Jean. "Structure et biosynthèse des mycosporines." Lyon 1, 1986. http://www.theses.fr/1986LYO19027.

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14

Cardozo, Karina Helena Morais. "Estudos de compostos fotoprotetores da radiação ultravioleta em algas: aminoácidos tipo micosporinas (MAAs)." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-08022008-164422/.

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Aminoácidos tipo micosporinas (MAAs) são compostos responsáveis pela fotoproteção no ultravioleta de diversos organismos aquáticos. São sintetizados pela via do ácido chiquímico por algas, bactérias e fungos, de maneira similar à síntese de flavonóides em plantas superiores. Neste trabalho foram conduzidos estudos relacionados a estes compostos em algas. Protocolos de extração de diferentes algas foram testados alterando-se parâmetros como solventes, temperatura e condições de incubação. Os resultados mostraram que dependendo da alga estudada, diferentes condições podem mudar a conce

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15

Saraiva, Anna Isabel Nassar Bautista [UNESP]. "Respostas fisiológicas de macroalgas continentais à radiação ultravioleta." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151243.

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16

Volkmann, Marc. "Analyse und Charakterisierung von Mycosporinen aus gesteinsbesiedelnden mikrokolonialen Pilzen und Umweltgesteinsproben." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971954003.

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17

Nguyen, Khanh Hung. "Synthèse d'analogues de mycosporines par catalyse à l'or et évaluation de leurs activités photoprotectrices." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S186.

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Le nombre de cancers et notamment de cancers photoinduits étant en augmentation, il est indispensable d’identifier de nouvelles molécules protectrices de type filtres UV, réparatrices vis-à-vis des altérations de l’ADN mais également favorisant la réponse pigmentaire. Les lichens sont des organismes originaux qui possèdent des qualités de résistance remarquables aux rayonnements solaires dues notamment à la production de métabolites photoprotecteurs tels que les mycosporines. A partir de ce motif structural original, nous avons synthétisé divers analogues par catalyse à l’or en utilisant un ou

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18

Andreguetti, Daniel Xavier. "Análogos de micosporinas: síntese e avaliação de parâmetros farmacológicos e toxicológicos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/9/9141/tde-21012011-163625/.

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Micosporinas são substâncias pertencentes a um grupo de compostos naturalmente encontrados em algas e fungos, que são utilizadas por estes organismos como mecanismo de defesa. São potentes bloqueadores químicos de radiação ultravioleta (UV), atuando principalmente na faixa espectral da radiação UVA, com absorção máxima variando entre 300 e 360 nm, dependendo de sua composição estrutural. Quimicamente, são caracterizadas por um cromóforo ciclohexenona ou ciclohexenimina conjugado com o nitrogênio substituinte de um aminoácido ou aminoálcool. Em alguns membros deste grupo também foi evidenciada

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19

Roullier, Catherine. "Recherche de mycosporines et de dérivés aminés lichéniques d’intérêt pour les cancers photoinduits : étude phytochimique d’un lichen marin : Lichina pygmaea (Lightf.) C. Agardh." Rennes 1, 2010. http://www.theses.fr/2010REN1S085.

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Suite à l’augmentation croissante des cancers de la peau, la recherche de nouvelles solutions thérapeutiques (et préventives) est nécessaire. Les lichens sont une source prometteuse de métabolites secondaires. Dans un premier temps, un criblage de différents lichens à cyanobactéries a permis de mettre en évidence la présence de composés de type mycosporine dans plusieurs d’entre elles et notamment d’une structure nouvellement décrite. La mycosporine sérinol a pu ensuite être isolée en quantité à partir d’un lichen marin Lichina pygmaea. Son étude phytochimique plus poussée a conduit à l’isolem

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20

Torres, Priscila Bezerra. "Análise de pigmentos fotossintetizantes e substâncias fenólicas em Gracilariopsis tenuifrons (C. J. Bird & E. C. Oliveira) Fredericq & Hommersand em diferentes intensidades de luz." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-19122012-214148/.

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O estresse de luz pode afetar consideravelmente o crescimento e o desenvolvimento dos organismos fotossintetizantes. Nestas situações, é comum verificar respostas químicas que podem indicar diferentes estratégias de fotoproteção adotado pelo organismo. No presente trabalho, foram desenvolvidas metodologias de análise e extração de pigmentos fotossintetizantes e compostos fenólicos na macroalga vermelha Gracilariopsis tenuifrons com o objetivo de avaliar os efeitos do aumento intensidade de luz sobre estes compostos. Foi verificado que aumento da intensidade de luz não provocou redução na bioma

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21

Singh, Shailendra Pratap [Verfasser]. "Study on mycosporine-like amino acids (MAAs) in cyanobacteria : a biochemical, bioinformatics and molecular biology approach / vorgelegt von Shailendra Pratap Singh." 2009. http://d-nb.info/997651075/34.

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22

Tu, Tsung-Han, and 杜宗翰. "Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/30585002301009904000.

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碩士<br>國立東華大學<br>海洋生物多樣性及演化研究所<br>99<br>Filamentous blue-green algae, Nostoc flagelliforme was tested for the presence of ultraviolet-absorbing mycosporine-like amino acids (MAAs). The aims of this study were to investigate the effects of long term exposure of different UVB intensities and salinity on chlorophyll a, MAAs both inside the cell and in culture medium, respectively. Results of chlorophyll a indicated that exposure to UVB irradiation and 20 mM NaCl enhanced the growth of N. flagelliforme, but in 260 mM NaCl, growth was inhibited. The increment of algal MAAs was proportional to the in

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23

Wang, Sheng-wen, and 王聖文. "The effects of ultraviolet radiation, salinity and nitrate on the production of mycosporine-like amino acids in Alexandrium minutum Halim ( Dinoflagellate )." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/hhz7m6.

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碩士<br>國立中山大學<br>海洋生物研究所<br>96<br>The photoprotect compound mycosporine-like amino acids ( MAAs ) are a family of secondary metabolites can protect organisms exposed to solar ultraviolet radiation ( UVR ), only produced in the algae. Analyzed by HPLC, only Alexandrium minutum Halim ( Dinophyceae ) produces MAAs among seven marine microalgae species. The strains named AM-2、AM-3、AM-4 and AM-6 showed the positive results for producing the MAAs, but not AM-5. Researches on the stability the MAAs extracts from algal powder ( AM-3 ) hold at 4℃, 25℃ and 50℃ for 35 days and light expose. The results sh

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24

Sui, Hsu-Chia, and 徐嘉穗. "Evaluations of anti-oxidation and anti-photoaging capability of Gracilaria lemaneformis mycosporine-like amino acids (MAAs) and its application in sunscreen skincare." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/54597481581535499310.

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碩士<br>國立臺灣海洋大學<br>食品科學系<br>95<br>The purpose of the thesis is to explore the efficacy of an anti-photoaging skincare that containing the MAAs extracts of Gracilaria lemaneformis. The UV absorption characteristics of MAAs, the efficacy of anti-aging such as the chelating ferrous ions capacities and the scavenging capacity of DPPH radical and superoxide radical were evaluated to find the optimize concentration of the anti-photoaging skincare. The efficacy of MAAs anti-photoaging in vitro by cells line experimentation was also explored. An anti-photoaging skincare that containing the MAAs extract

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25

Volkmann, Marc [Verfasser]. "Analyse und Charakterisierung von Mycosporinen aus gesteinsbesiedelnden mikrokolonialen Pilzen und Umweltgesteinsproben / von Marc Volkmann." 2004. http://d-nb.info/971954003/34.

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