Consulta: subjectFacets:"Rhodophyta"
Registros recuperados: 26
Data/hora: 01/06/2024 16:36:14

Formación de pelos en el alga agarófita gracilaria chilensis(Gracilariales, Rhodophyta)
Provedor de dados: 66
Autores: Garcia,Maximiliano D.; Miravalles,Alicia B.; Leonardi,Patricia I.
Gracilaria chilensis es un alga roja agarófita perteneciente a la clase Florideophyceae. En este estudio se describe la formación de pelos en talos mantenidos en cultivo en agua de mar enriquecida, bajo condiciones controladas de luz y temperatura. La inducción de los pelos fue realizada colocando porciones de talos en un medio de cultivo carente de compuestos nitrogenados. Se emplearon técnicas de microscopía óptica y electrónica de transmisión y barrido. Los pelos se desarrollan a partir de células corticales ovoides grandes. Estas células formadoras de pelos (CFPs) son multinucleadas, poseen pequeños plástidos y una abundante red de retículo endoplasmático de disposición apical. La formación de los pelos comienza con el desarrollo de una protuberancia,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Florideophyceae; Gracilaria; Pelos; Rhodophyta; Ultraestructura.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932007000100001

First record of a ceramiaceous red algal species, Ceramium stichidiosum, from magellanic region, chile
Provedor de dados: 72
Autores: Mansilla,Andrés; Navarro,Nelso P; Fujii,Mutue T.
A ceramiaceous red alga, Ceramium stichidiosum J. Agardh was found for the first time in waters of Magellanic Strait, Chile. Thalli are usually epiphytic on other macroalgae such as Mazzaella laminarioides (Bory) Fredericq and Sarcothalia crispata (Bory) Leister. They have fully corticated axes with alternate to dichotomous branches, straight tips and six periaxial cells per each axial cell. This report extends the distribution limit of C. stichidiosum from the X Región de los Lagos (42º 58'S; 74º 19'W) to the XII Región de Magallanes (53°37'S; 70°59'W).
Tipo: Journal article
Palavras-chave: Ceramium; Ceramium stichidiosum; Chile; Geographical distribution; Rhodophyta; Taxonomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200012

Some considerations for analyzing biodiversity using integrative metagenomics and gene networks
Provedor de dados: 5
Autores: Bittner, Lucie; Halary, Sebastien; Payri, Claude; Cruaud, Corinne; De Reviers, Bruno; Lopez, Philippe; Bapteste, Eric.
Background:  Improving knowledge of biodiversity will benefit conservation biology, enhance bioremediation studies, and could lead to new medical treatments. However there is no standard approach to estimate and to compare the diversity of different environments, or to study its past, and possibly, future evolution. Presentation of the hypothesis:  We argue that there are two conditions for significant progress in the identification and quantification of biodiversity. First, integrative metagenomic studies - aiming at the simultaneous examination (or even better at the integration) of observations about the elements, functions and evolutionary processes captured by the massive sequencing of multiple markers - should be preferred over DNA barcoding projects...
Tipo: Text
Palavras-chave: Microbial diversity; Species concept; Dna barcodes; Ecological perspective; Community; Functional analysis; Rhodophyta; Systematics; Fragments; Taxonomy.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00202/31321/29733.pdf

Photo-protective compounds in red macroalgae from Brittany: Considerable diversity in mycosporine-like amino acids (MAAs)
Provedor de dados: 5
Autores: Lalegerie, Fanny; Lajili, Sirine; Bedoux, Gilles; Taupin, Laure; Stiger-pouvreau, Valerie; Connan, Solène.
To cope with the biotic and abiotic stresses experienced within their environment, marine macroalgae have developed certain defence mechanisms including the synthesis of photo-protective molecules against light and particularly harmful UV radiation. The aim of this study was to screen selected red algae, a highly diverse phylogenetic group, for the production of photo-protective molecules. The pigment content and composition (i.e. chlorophyll-a, phycobiliproteins and carotenoids) and the composition of mycosporine-like amino acids (MAAs) were studied in 40 species of red macroalgae collected in Brittany (France), at two distinct periods (i.e. February and July 2017). A high inter-specific variability was demonstrated in terms of pigment content and MAA...
Tipo: Text
Palavras-chave: Algae; Diversity; HPLC; MAAs; Metabolites; Photo-protection; Pigments; Rhodophyta; Screening.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00488/59929/63133.pdf

A taxonomic, phylogenetic and biogeographic study of the genus Acanthophora (Rhodomelaceae, Rhodophyta)
Provedor de dados: 16
Autores: Jong, Yde S.D.M. de; Hitipeuw, Creusa; Prud’homme van Reine, Willem F.
A cladistic analysis, based on a taxonomic revision is carried out for 7 Acanthophora species using 19 characters. Hypotheses on species affinities are based primarily on morphological characters. Because most species show only few distinctive characters, emphasis was placed on features of spine development, either in relation to vegetative or to reproductive structures. Global distribution of 7 Acanthophora species: viz. A. aokii, A. dendroides, A. muscoides, A. nayadiformis, A. pacifica, A. ramulosa, and A. spicifera, shows a discontinuous pattern. Although widely distributed species are present (A. muscoides and A. spicifera), a disjunct distribution of other species occurs in the Pacific (A. aokii), Indian Ocean (A. dendroides), East-Atlantic region...
Tipo: Article / Letter to the editor
Palavras-chave: Rhodomelaceae; Rhodophyta; Biogeography; Phylogenetics; Seaweeds; Taxonomy.
Ano: 1999
URL: http://www.repository.naturalis.nl/record/525490

Types and originals of fossil Porifera and Cnidaria of Indonesia in Naturalis
Provedor de dados: 16
Autores: Leloux, J.; Renema, W.
The collection of Naturalis contains a significant collection of fossil corals and sponges. Within the framework of the 'NWO Groot' digitalisation projects the typespecimens, mainly from Indonesia, of Gerth, Umbgrove and related researchers were catalogued. 3920 lots containing 3479 typespecimens related to 676 taxa are concerned.
Tipo: Article / Letter to the editor
Palavras-chave: Gerth; Martin; Umbgrove; Foraminifera; Hydrozoa; Scleractinia; Rugosa; Tabulata; Octocorallia; Bivalvia; Ammonoidea; Echinodermata; Rhodophyta; Tertiary; Permian; 38.22.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/270361

Morphology and reproduction of Predaea feldmannii Børgesen (Nemastomataceae, Rhodophyta), an uncommon species from Brazil
Provedor de dados: 88
Autores: Guimarães,Silvia M.P.B.; Horta,Paulo A.
The coast of Espirito Santo State is located in a biogeographic transition zone presenting high diversity. A renewed interest in this region occurred in the 1990s, resulting in various new records and new species descriptions added to the Brazilian marine flora. The study of the infralitoral of this region is just beginning, and a detailed exploration with use of Scuba diving is revealing a flora containing many little-known taxa, particularly of red algae. As a first result, Predaea feldmannii Børgesen is being described for the Brazilian coast. The occurrence of the genus Predaea in Brazil has been considered with restriction since representatives of this genus had been referred only once by Howe &amp;amp; Taylor in 1931, being first considered as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphology; Nemastomataceae; Predaea; Rhodophyta; Taxonomy.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000300010

Morphology, reproduction and development of Hypoglossum hypoglossoides (Stackhouse) Collins &amp;amp; Hervey (Ceramiales, Rhodophyta) from the south and southeastern Brazilian coast
Provedor de dados: 88
Autores: Horta,Paulo A.; Yokoya,Nair S.; Guimarães,Silvia M.P.B.; Bacci,Denise S.; Oliveira,Eurico C.
Hypoglossum hypoglossoides (Stackhouse) Collins &amp;amp; Hervey is reported for the first time from the infralittoral of São Paulo and Santa Catarina states. The species was already reported to the states of Rio de Janeiro, Espírito Santo and Bahia as Hypoglossum tenuifolium (Harvey) J. Agardh var. carolinianum Williams. A detailed description of the morphology and reproduction is given based on field-collected material. Unialgal cultures were initiated from tetraspore germination, and growth rates of gametophytes were determined under different conditions of temperature, photoperiod and irradiance. Gametophytes grew well between 15 to 30 ºC, 14L:10D and 10L:14D photoperiods and irradiance from 20 to 120 µmol photons.m-2.s-1, but presented low percentage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Delesseriaceae; Development; Hypoglossum hypoglossoides; Reproduction; Rhodophyta.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000400004

O gênero Cheilosporum (Decaisne) Zanardini (Corallinales, Rhodophyta) no litoral do Brasil
Provedor de dados: 88
Autores: MOURA,CARLOS W.N.; GUIMARÃES,SÍLVIA M.P.B.
Duas espécies de Cheilosporum foram encontradas no levantamento das espécies do gênero Cheilosporum no litoral do Brasil: C. cultratum (Harvey) Areschoug e C. sagittatum (Lamouroux) Areschoug. A primeira havia sido referida para o Brasil em 1870 por Martens e foi redescoberta para o Atlântico americano. Esta espécie tem distribuição restrita a área de ressurgência do litoral de Cabo Frio no Rio de Janeiro, Búzios e Arraial do Cabo, enquanto C. sagittatum apresenta uma distribuição ampla no litoral das regiões sudeste e sul do Brasil. Conceptáculos femininos/carposporangiais e estágios iniciais de pós-fertilização são descritos pela primeira vez para C. sagittatum. Células epiteliais arredondadas e tricocitos tipo-Corallina em microscopia eletrônica de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cheilosporum; Corallinales; Geniculate coralline algae; Rhodophyta; Taxonomy.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000100009

Formação de calos e regeneração de segmentos apicais de Hypnea musciformis (Wulfen) Lamouroux (Gigartinales, Rhodophyta): obtenção de culturas axênicas e efeitos da concentração do ágar
Provedor de dados: 88
Autores: Bravin,Isolda Cecília; Valentin,Yocie Yoneshigue; Yokoya,Nair S.
Culturas axênicas de Hypnea musciformis (Wulfen) Lamouroux foram estabelecidas em meio de Provasoli (PES) sólido com diferentes concentrações de ágar (0,4%, 0,6%, 0,8% e 1,0%) para avaliar o seu efeito na formação de calos e na regeneração de plantas. O cultivo em meio sólido induziu a formação de quatro tipos de calos (apical - CApi, lateral 1 - CLat1, lateral 2 - CLat2 e basal - CBas), os quais são constituídos internamente por proliferações unisseriadas pigmentadas. O tipo CApi foi o mais freqüente (taxa de 5,3 calos por explante em 1,0% de ágar). A maior biomassa das plântulas regeneradas (7,4 g) foi alcançada a partir de calos cultivados a 1,0% de ágar. A formação dos quatro tipos de calos é um dado inédito e indica que as diferentes concentrações de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calos; Cultura axênica; Efeito do ágar; Hypnea musciformis; Rhodophyta.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000100015

Reavaliação das características morfológicas e suas implicações taxonômicas no gênero Polysiphonia sensu lato (Ceramiales, Rhodophyta) do litoral dos Estados de São Paulo e Espírito Santo, Brasil
Provedor de dados: 88
Autores: Guimarães,Silvia M.P.B.; Fujii,Mutue T.; Pupo,Diclá; Yokoya,Nair S.
O gênero Polysiphonia Grev. tem uma circunscrição ampla e é heterogêneo em características vegetativas e reprodutivas. O presente trabalho visa o estudo detalhado e a reavaliação das espécies de Polysiphonia sensu lato que ocorrem nos Estados do Espírito Santo e São Paulo, tendo em vista os critérios taxonômicos recentes, que levaram à subdivisão do gêneroem Polysiphonia e Neosiphonia M.-S. Kim &amp;amp; I.K. Lee. Neste trabalho, são estudadas cinco espécies de Polysiphonia e seis espécies de Neosiphonia, sendo que Neosiphonia ferulacea (Suhr ex J. Agardh) S.M. Guim. &amp;amp; M.T. Fujii, N. gorgoniae (Harv.) S.M. Guim. &amp;amp; M.T. Fujii e N. tepida (Hollenb.) S.M. Guim. &amp;amp; M.T. Fujii são propostas como combinações novas. Neosiphonia harveyi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceramiales; Neosiphonia; Polysiphonia; Rhodophyta; Taxonomia.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000100017

Sulfated bromophenols from Osmundaria obtusiloba (C. Agardh) R. E. Norris (Rhodophyta, Ceramiales)
Provedor de dados: 88
Autores: Carvalho,Luciana Retz de; Guimarães,Silvia M.P. de Beauclair; Roque,Nidia Franca.
Two new sulfated oligobromophenols from the marine red algae Osmundaria obtusiloba, 4-(1'-potassium sulfate, 2,3-dibromo, 1',4,5-trihydroxybenzyl) - 4''-(1'''-potassium sulfate, 2'',3''-dibromo, 1''',4'',5''-trihydroxybenzyl) sulfate and 1'-(2, 3-dibromo, 4-potassium sulfate, 1', 4, 5-trihydroxybenzyl) - 4''-(1''' potassium sulfate, 2'', 3''-dibromo, 1''', 4'', 5'' trihydroxybenzyl) sulfate, are herein reported. Besides them it was obtained 2, 2', 3, 3'-tetrabromo-4, 4', 5, 5'-tetrahydroxydiphenylmethane, 2, 3-dibromo-p-hydroxybenzyl methyl ether (methyl lanosol), dipotassium 2,3-dibromo-5-hydroxybenzyl 1',4-disulfate, 24-methylenecolest-5-en-3-beta-ol and alpha-D-mannopyranosyl-(1-&gt;2')-glycerate (digeneaside). The structures were determined by analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digeneaside; Lanosol; Osmundaria obtusiloba; Rhodophyta; Sulfated bromophenols.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000300012

Efeitos do ágar no crescimento de explantes e na formação de calos em morfos pigmentares de Gracilaria domingensis (Kützing) Sonder ex Dickie (Gracilariales, Rhodophyta)
Provedor de dados: 88
Autores: Ramlov,Fernanda; Plastino,Estela M.; Yokoya,Nair S.
Os efeitos da concentração de ágar no crescimento de explantes e na formação de calos foram avaliados em culturas axênicas de gametófitos femininos de morfos de coloração verde e vermelha de Gracilaria domingensis (Kützing) Sonder ex Dickie. Culturas unialgáceas foram mantidas em água do mar esterilizada (30-32 ups) enriquecida com 25% da solução de von Stosch (VSES 25%), 22 ± 2 °C, fotoperíodo de 14 h, irradiância de 50-80 µmol de fótons m-2 s-1. Para a obtenção de explantes axênicos, segmentos apicais e intercalares dos dois morfos foram cultivados por 48 h em meio VSES 25% com adição de uma solução antibiótica e antifúngica, e submetidos a uma lavagem com uma solução de água do mar esterilizada com 0,5% de hipoclorito de sódio e 200 µL L-1 de detergente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ágar; Calos; Gracilaria domingensis; Morfos pigmentares; Rhodophyta.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000300018

Ceramium nitens (Ceramiaceae, Rhodophyta), an uncommon species from Brazil
Provedor de dados: 88
Autores: FUJII,MUTUE TOYOTA; COCENTINO,ADILMA L.M.; PEREIRA,SONIA M. B.
Morphological studies on Ceramium nitens (C. Agardh) J. Agardh, a completely corticated species, were carried out based on specimens rediscovered in Brazil fifty years after its first record. Its occurrence in Brazil was considered doubtful since it had been collected only once since 1945. Ceramium nitens can be recognized by having axial cells entirely covered by cortical cells, except for the cells near the apex, obscuring the nodal and internodal banding thalli, characteristic of most Ceramium species. In this paper the occurrence of Ceramium nitens in Brazil is confirmed and its vegetative and tetrasporangial structures are described in detail and their implications for the taxonomy of the genera Ceramium, Centroceras and Corallophila are discussed....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Ceramium nitens; Morphology; Taxonomy; Geographic distribution.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000300014

The genus Callophyllis (Kallymeniaceae, Rhodophyta) from the central-south Chilean coast (33° to 41° S), with the description of two new species
Provedor de dados: 97
Autores: ARAKAKI,NATALIA; ALVEAL,KRISLER; RAMÍREZ,MARÍA ELIANA; FREDERICQ,SUZANNE.
The taxonomic status of the species in the genus Callophyllis Kützing (Kallymeniaceae, Rhodophyta) from central-south Chile (33° to 41° S) is examined on the basis of morphological and molecular evidence. Of the four species originally cited for central Chile, C. variegata, C. pinnata, C. atrosanguinea and C. laciniata, only the presence of C. variegata has been confirmed in this study. C. pinnata reported from Chile is found to be different from C. pinnata described from California, and it is here newly described as C. concepcionensis sp. nov. C. atrosanguinea from southern Chile (including C. linguata from the Antarctic Peninsula) is distinct from the species called C. atrosanguinea from central-south Chile, the latter which is here described as C....
Tipo: Journal article
Palavras-chave: Callophyllis; Chile; Kallymeniaceae; RbcL; Rhodophyta; Systematics.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000400002

Levantamento florístico das Rodofíceas do Arquipélago de São Pedro e São Paulo (ASPSP) - Brasil
Provedor de dados: 39
Autores: Burgos,Douglas Correia; Pereira,Sonia Maria Barreto; Bandeira-Pedrosa,Maria Elizabeth.
Este trabalho apresenta o levantamento florístico e alguns aspectos ecológicos das algas vermelhas do Arquipélago de São Pedro e São Paulo (00º56'N; 29º22'W - 00º 55'N; 29º 20'W). O material foi coletado durante as marés baixas em seis estações, nas zonas entre-marés e infralitoral no mês de outubro de 2003 (estação seca) e abril de 2005 (estação chuvosa). Foram registradas 24 espécies, distribuídas entre as ordens Bonnemaisoniales (uma espécie), Ceramiales (12 espécies), Corallinales (seis espécies), Erythropeltidales (uma espécie), Gelidiales (uma espécie), Rhodymeniales (duas espécies) e Stylonematales (uma espécie). Foram feitos 15 novos registros de rodofíceas à flora do Arquipélago e quatro novas adições para as ilhas oceânicas brasileiras: Ceramium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algas marinhas; Rhodophyta; Arquipélago; Brasil.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000400020

Estudos morfológicos e taxonômicos em Hypnea cornuta (Kützing) J. Agardh (Gigartinales, Rhodophyta) no litoral da Bahia, Brasil
Provedor de dados: 39
Autores: Jesus,Priscila Barreto de; Nunes,José Marcos de Castro.
Durante estudo sobre as espécies de Hypnea do litoral do estado da Bahia foram encontrados exemplares de Hypnea cornuta (Kützing) J. Agardh em coletas realizadas no extremo sul do estado. Este é o primeiro relato de H. cornuta para o estado da Bahia, Brasil. É fornecida uma caracterização detalhada dos aspectos morfológicos, anatômicos e reprodutivos desta espécie.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bahia; Nova ocorrência; Morfologia; Rhodophyta; Taxonomia.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000400027

Distribution of epiphytic macroalgae on the thalli of their hosts in Cuba
Provedor de dados: 39
Autores: Diez García,Yander Luis; Jover Capote,Abdiel; Suárez Alfonso,Ana María; Gómez Luna,Liliana María; Fujii,Mutue Toyota.
We investigated the distribution of epiphytic macroalgae on the thalli of their hosts at eight localities along the southeastern coast of Cuba between June 2010 and March 2011. We divided he epiphytes in two groups according to their distribution on the host: those at the base of the thallus and those on its surface. We determining the dissimilarity between the zones and the species involved. We identified 102 taxa of epiphytic macroalgae. There were significant differences between the two zones. In 31 hosts, the number of epiphytes was higher on the surface of the thallus, whereas the number of epiphytes was higher at the thallus base in 25 hosts, and the epiphytes were equally distributed between the two zones in five hosts (R=−0.001, p=0.398). The mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyta; Epiphytism; Distribution; Phaeophyceae; Rhodophyta.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400022

Inhibition of coagulation proteases and thrombosis and sub-chronic toxicological study of a sulfated polysaccharidic fraction from the red alga Gelidiella acerosa
Provedor de dados: 3
Autores: Queiroz, Ismael Nilo Lino de; Rodrigues, José Ariévilo Gurgel; Quinderé, Ana Luíza Gomes; Holanda, Márjory Lima; Pereira, Maria Gonçalves; Benevides, Norma Maria Barros.
Metabolites isolated from Gelidiella species (Rhodophyta) have been few studied. We evaluated a sulfated polysaccharidic fraction from G. acerosa collected from two Brazilian beaches on the northwestern coast of Brazil (Flecheiras-F and Pedra Rachada-PR) on coagulation proteases and thrombosis. Their toxicity in vivo was also assessed. Enzymatic extractions yielded 1.40%, and similar chromatographic profiles (DEAE-cellulose) were obtained, with fractions (Ga-I→V) containing differences among the relative proportions of sulfate (5-42%), and revealing charge density patterns by electrophoresis. Ga-IV-PR had a discrete effect (3.01 IU mg-1) on normal human coagulation compared with heparin  (193 IU mg-1) and was tested on coagulation proteases (thrombin and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Polysulfated; Gelidiella acerosa; Antithrombotic agent; Bioactivities; In vivo toxicity.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/23704

Antioxidant potential and cytotoxic activity of two red seaweed species, Amansia multifida and Meristiella echinocarpa, from the coast of Northeastern Brazil
Provedor de dados: 42
Autores: ALENCAR,DANIEL B. DE; SILVA,SUZETE R. DA; PIRES-CAVALCANTE,KELMA M.S.; LIMA,REBECA L. DE; PEREIRA JÚNIOR,FRANCISCO N.; SOUSA,MÁRCIA B. DE; VIANA,FRANCISCO A.; NAGANO,CELSO S.; NASCIMENTO,KYRIA S. DO; CAVADA,BENILDO S.; SAMPAIO,ALEXANDRE H.; SAKER-SAMPAIO,SILVANA.
Natural antioxidants found in marine macroalgae are bioactive compounds known to play an important role in the prevention of diseases associated with aging cells protecting them against the oxidative damage. The purpose of this study was to evaluate the antioxidant and cytotoxic activity of ethanolic extracts of two species of red seaweeds, Amansia multifida and Meristiella echinocarpa. In vitro antioxidant activity was determined by DPPH radical scavenging assay, ferric-reducing antioxidant power (FRAP) assay, ferrous ion chelating (FIC) assay, β-carotene bleaching (BCB) assay and total phenolic content (TPC) quantification. Cytotoxicity was evaluated with the brine shrimp Artemia sp. lethality test. The TPC values observed in the present study indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Bioactive compounds; Cytotoxic; Phenolic compounds; Rhodophyta.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100251

Fatty acid composition from the marine red algae Pterocladiella capillacea (S. G. Gmelin) Santelices &amp;amp; Hommersand 1997 and Osmundaria obtusiloba (C. Agardh) R. E. Norris 1991 and its antioxidant activity
Provedor de dados: 42
Autores: ALENCAR,DANIEL B. DE; DINIZ,JAÉCIO C.; ROCHA,SIMONE A.S.; PIRES-CAVALCANTE,KELMA M.S.; LIMA,REBECA L. DE; SOUSA,KAROLINA C. DE; FREITAS,JEFFERSON O.; BEZERRA,RAYSSA M.; BARACHO,BÁRBARA M.; SAMPAIO,ALEXANDRE H.; VIANA,FRANCISCO A.; SAKER-SAMPAIO,SILVANA.
ABSTRACT This study evaluated the chemical composition and antioxidant activity of fatty acids from the marine red algae Pterocladiella capillacea (S. G. Gmelin) Santelices &amp; Hommersand 1997 and Osmundaria obtusiloba (C. Agardh) R. E. Norris 1991. The gas chromatography mass spectrometry (GC-MS) identified nine fatty acids in the two species. The major fatty acids of P. capillacea and O. obtusiloba were palmitic acid, oleic acid, arachidonic acid and eicosapentaenoic acid. The DPPH radical scavenging capacity of fatty acids was moderate ranging from 25.90% to 29.97%. Fatty acids from P. capillacea (31.18%) had a moderate ferrous ions chelating activity (FIC), while in O. obtusiloba (17.17%), was weak. The ferric reducing antioxidant power (FRAP) of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acids; Antioxidant activity; Palmitic acid; Rhodophyta.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100449

Fine structural study of the red seaweed Gymnogongrus torulosus (Phyllophoraceae, Rhodophyta)
Provedor de dados: 47
Autores: Estevez,José M.; Cáceres,Eduardo J.
The present study analyzed several characters of the red seaweed Gymnogongrus torulosus, such as cellular structure of the thallus, cuticle, pit plug and cell wall ultrastructure, and morphology of some organelles like plastids, Golgi bodies and mitochondria. Also, anomalous chloroplasts with thylakoid disorganization were found in medullary cells. The significance of this thylakoid disposition is still unclear. This is one of the first studies focused on the fine structure of a red alga recorded in Argentina.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anomalous Chloroplasts; Cell Wall; Cystocarpic Thalli; Fine Structure; Gymnogongrus Torulosus; Pit Plugs; Rhodophyta.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000200003

Novas referências de rodofíceas marinhas bentônicas para o litoral brasileiro
Provedor de dados: 49
Autores: Nunes,José Marcos de Castro; Guimarães,Silvia Maria Pita de Beauclair.
Sete táxons de rodofíceas marinhas bentônicas são referidos pela primeira vez para o litoral brasileiro: Acrochaetium corymbiferum (Thur. in Le Jolis) Batters, A. liagorae Børgesen, Aglaothamnion herveyi (M. Howe) Aponte, D.L. Ballant. &amp;amp; J.N. Norris, Crouanophycus latiaxis (L.A. Abbott) Athanas., Grallatoria reptans M. Howe e Gelidiella sanctarum Feldmann &amp;amp; Hamel. Gelidiopsis repens (Kütz.) Weber Bosse é pela primeira vez referido para o Oceano Atlântico. As coletas foram realizadas no medio e infralitoral. O material está depositado no Herbário Alexandre Leal Costa. Referência da descrição original, basiônimo, descrição morfológica, distribuição geográfica e comentários taxonômicos são apresentados para cada táxon estudado.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Novos registros; Brasil; Oceano Atlântico.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000400008

Contributions to the knowledge of macroalgae of the Gerlache Strait - Antarctica
Provedor de dados: 50
Autores: Rincón-Díaz,Natalia; Macaya,Erasmo; Guzmán-Henao3,Sara E.
ABSTRACT This research is a contribution to the knowledge of some marine macroalgae species collected during the “Admiral Padilla” (2016-2017) and “Admiral Campos” (2018-2019) scientific expeditions, in which the Marine and Coastal Research Institute-Invemar participated with the project “Biodiversity and Oceanographic Conditions of the Gerlache Strait-Biogerlache-Antartica”. Samples were taken using a Shipek dredge; and underwater video recordings were made with a ROV (Remote Operated Vehicle). Six (6) species were identified: four (4) Rhodophyta and two (2) Ochrophyta-Phaeophyceae. Depth and zonation information where the macroalgae were found is included, and their relationship with previous records for the study area.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Phaeophyceae; Depth; Polar benthic macroalgae.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300213

Antimicrobial effect of a crude sulfated polysaccharide from the red seaweed Gracilaria ornata
Provedor de dados: 52
Autores: Amorim,Rodrigo das Neves dos Santos; Rodrigues,José Ariévilo Gurgel; Holanda,Márjory Lima; Quinderé,Ana Luíza Gomes; Paula,Regina Célia Monteiro de; Melo,Vânia Maria Maciel; Benevides,Norma Maria Barros.
The aim of this study was to determine the yield, chemical composition, specific rotation (SR), infrared (IR) spectroscopy and the effect on bacterial growth of a crude sulfated polysaccharide (SP) from the red marine alga G. ornata (Go). Go-1 (25°C), Go-2 (80°C), and Go-3 (80°C) were sequentially extracted and yielded 9.2%. The contents of sulfate (5.88-10.3%) and proteins (0.1-3.7%) were small. The values of SR were [µ]D20°f -19.0, -51.0, and -56.5, respectively. IR spectrums showed the presence of galactose-4 sulfate and absence of 3,6-anydrogalactose-2 sulfate, galactose-6 sulfate and galactose-2 sulfate. SR and IR techniques confirmed SPs. Go-3 was tested on the growth of bacteria (Bacillus subtilis, Staphylococcus aureus, Enterobacter aerogens,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Sulfated macromolecules; Chemical analysis; Antimicrobial.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200001

Trichogloea requienii (Montagne) Kützing (Rhodophyta: Liagoraceae) no litoral do Brasil
Provedor de dados: 57
Autores: MOURA,C. W. N.; CORDEIRO-MARINO,M.; GUIMARÃES,S. M. P. B.
O presente trabalho cita a ocorrência de Trichogloea requienii no litoral da Bahia, nordeste do Brasil. O gênero é caracterizado por apresentar calcificação moderada na região entre os filamentos assimiladores (córtex) e medula, células mães dos espermatângios dispostas em verticilos sobre as células subterminais corticais, carpogônio localizado no final do filamento assimilador e desenvolvimento de filamentos estéreis curtos nas células inferiores do ramo carpogonial. São apresentadas descrição e ilustração detalhadas do táxon, além da comparação com entidades afins. Esta é a primeira citação do gênero para o Atlântico Sul.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Liagoraceae; Taxonomia; Trichogloea.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100019