Consulta: subjectFacets:"Red algae"
Registros recuperados: 8
Data/hora: 02/06/2024 16:29:35

L’algue rouge "Gracilaria verrucosa" (hudson) papenfuss de la lagune de Bizerte (Tunisie septentrionale) : essai de culture en mode suspendu et composition biochimique
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Mensi, F.; Ksouri, J.; Hammami, W.; Romdhane, M.S.
L'algue rouge, Gracilaria verrucosa, a été cultivée, durant le printemps 2009, en mode suspendu à différents emplacements et profondeurs  représentant les différences biogéochimiques de la lagune de Bizerte au Nord de la Tunisie. La concentration et la distribution des nutriments (ammonium, phosphate) dans l'eau, ainsi que la salinité, la température, l’oxygène et la transparence de l’eau ont été déterminées. Les méthodes analytiques internationales standardisées ont été appliquées. Les effets du  mode de culture, de l’emplacement et de la profondeur sur les rendements en poids, protéines, R-Phycoérythrine et sucres totaux  de l’algue ont été étudiés. La croissance de Gracilaria a été similaire dans les différents sites mais plus lente dans les profondeurs...
Tipo: Journal Contribution
Palavras-chave: Algal culture; Ammonium compounds; Biochemical composition; Biogeochemistry; Carbohydrates; Dissolved oxygen; Environmental conditions; Growth; Intensive culture; Lagoons; Off-bottom culture; Raw materials; Red algae; Biogeochemical cycle.
Ano: 2009
URL: http://hdl.handle.net/1834/4497

Efecto del tratamiento alcalino sobre la productividad y las propiedades físicas del agar-agar proveniente de Gracilaria verrucosa
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Álvarez León, R.; Dulce-Rivadeneira, M. F.; Montilla Escudero, E. A.; Trespalacios Rangel, A. A.; Quevedo Hidalgo, B.; Mercado Reyes, M.; Molina Vargas, J. N.
Se evaluó el efecto del tratamiento alcalino con NaOH sobre el rendimiento en la extracción y en las propiedades físicas del agar de Gracilaria verrucosa recolectada en Santa Verónica (Atlántico, Colombia). El tratamiento alcalino se realizó a temperatura entre 80 y 85 °C, con concentraciones de solución de NaOH 3, 5, 7 y 10 % (p/v). Se determinó el rendimiento de la extracción y al agar obtenido se le midió la fuerza del gel y las temperaturas de fusión y gelificación. Aungque el rendimiento máximo se obtuvo para una concentración de 10 %, se encontraron diferencias significativas en las propiedades del agar, obteniéndose fuerza de gel máxima con solución 3 %. El agar-agar obtenido fue utilizado como base para agar nutritivo y se determinó su...
Tipo: Journal Contribution
Palavras-chave: Agar; Gracilaria verrucosa; Productivity; Red algae.
Ano: 2011
URL: http://hdl.handle.net/1834/4410

Some Properties of Glutamate Dehydrogenase from the Marine Red Alga Gracilaria sordida (Harv.) W. Nelson
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Mtolera, M.S.P.
Glutamate dehydrogenases (GDH, EC 1.4.1.2-4) catalyse the entry of ammonium into the organic cycle via amination of a-ketoglutarate and its release via deamination of Lglutamate. NAD-GDH facilitates NAD-/NADP-dependent deamination while NADPH-GDH facilitates NADH-/NADPH-dependent amination reactions. In the study reported here, GDHs were extracted from the red alga Gracilaria sordida and purified 10- to 180-fold before examining their amination and deamination reaction properties. NAD-/NADP- and NADH-/ NADPH-dependent activities were the order of 11:1 and 1:1.8, respectively. The pH optima for amination and deamination were 8.2 and 8.4 under NADH- and NADPH- and 8.4 and 9 under NAD- and NADP- dependent activities, respectively. Whereas both NAD- and...
Tipo: Journal Contribution
Palavras-chave: Algae; Red algae; Http://aims.fao.org/aos/agrovoc/c_13790.
Ano: 2003
URL: http://hdl.handle.net/1834/965

Modeling laboratory culture of Gracilaria verrucosa (Hudson) Papenfuss according to nutrients concentrations and salinities levels
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Mensi, F.; Ksouri, J.; Seale, E. G.; Romdhane, M.S.
L'exploitation des algues rouges appartenant au genre Gracilaria pour l'extraction de l'agar a considérablement augmenté au cours des dernières décennies. En Tunisie Gracilaria verrucosa (Hudson) Papenfuss 1950 (Rhodophyta), est candidate pour la culture dans la lagune de Bizerte (Nord de la Tunisie) où ne pousse que sur une courte période de l’année. Ainsi, le but de cette étude est de recueillir des informations de base sur sa croissance dans cette région. Les effets de la salinité des sources d’azote et du phosphore ainsi que leurs concentrations sur la croissance de cette algue ont été étudiés à l'échelle de laboratoire en utilisant la méthodologie de surface des réponses. Afin de déterminer les interactions entre les variables et les niveaux optimaux...
Tipo: Journal Contribution
Palavras-chave: Algae; Ammonium; Red algae; Salinity; Growth; Nitrates.
Ano: 2011
URL: http://hdl.handle.net/1834/4734

The status of the name Alysium holtingii C. Agardh, a red alga described from Brazil, and a depiction of the type specimen
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Wynne,Michael J.
The type specimen of the red alga Alysium holtingii C. Agardh, described from Brazil, is located in the Lund Herbarium, and it is depicted for the first time in a publication. It is taxonomically identical to Dichotomaria obtusata (J. Ellis and Solander) Lamarck and thus can be treated as a later taxonomic synonym. Alysium is regarded as congeneric with Dichotomaria.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alysium; Brazil; Dichotomaria obtusata; Red algae; Taxonomy; Type specimen.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200010

Antinociceptive activity of sulfated carbohydrates from the red algae Bryothamnion seaforthii (Turner) Kütz. and B. triquetrum (S.G. Gmel.) M. Howe
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Viana,G.S.B.; Freitas,A.L.P.; Lima,M.M.L.; Vieira,L.A.P.; Andrade,M.C.H.; Benevides,N.M.B.
We report the antinociceptive activity, determined by the writhing, formalin and hot-plate tests in mice, of crude (F0/60), lectin and carbohydrate fractions isolated by ammonium sulfate precipitation (0 to 60%) from Bryothamnion seaforthii and B. triquetrum, species of red algae. Not only fraction F0/60 but also lectins from both species significantly inhibited acetic acid-induced abdominal contractions after intraperitoneal or oral administrations. In the formalin test, lectins (1 and 5 mg/kg, ip, and 5 to 20 mg/kg, po) inhibited the 1st and 2nd phases (5 and 20 min, respectively), but the effect occurred predominantly on the 2nd phase. The effects of the lectins were totally or partially reversed by naloxone (2 mg/kg, sc) in the 1st and 2nd phases,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Red algae; Bryothamnion seaforthii; Bryothamnion triquetrum; Carbohydrates; Antinociceptive effect.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000600012

Antinociceptive properties in mice of a lectin isolated from the marine alga Amansia multifida Lamouroux
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Neves,S.A.; Freitas,A.L.P.; Souza,B.W.S.; Rocha,M.L.A.; Correia,M.V.O.; Sampaio,D.A.; Viana,G.S.B.
The antinociceptive effects of a lectin (LEC) isolated from the marine alga Amansia multifida were determined in Swiss mice. The LEC (1, 5, and 10 mg/kg) inhibited acetic acid-induced abdominal writhings in a dose-dependent manner after intraperitoneal or oral administration. A partial but significant inhibition of writhings was observed after the combination of LEC (10 mg/kg) with avidin (1 mg/kg), a potent inhibitor of the hemmaglutinant activity of the lectin. However, total writhing inhibition was demonstrable in the group of mice treated with LEC plus mannose (1 mg/kg), as compared to LEC alone or to control groups. Furthermore, avidin and mainly mannose also play a role in antinociception, somehow facilitating the interaction of LEC with its active...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Red algae; Amansia multifida; Lectin; Antinociceptive effects; Mannose-specific lectin.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000100016

Photoacclimation in three species of freshwater red algae
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Bautista,Anna I.N.; Necchi Jr.,Orlando.
Three freshwater Rhodophyta species (Audouinella eugenea, A. hermannii and Compsopogon coeruleus) were tested as to their responses (photosynthesis, growth and pigment concentration) to two irradiances (low light, LL, 65 µmol m-2 s-1 and high light, HL, 300 µmol m-2 s-1) and two periods (short time, ST, 4 d, and long time, LT, 28 d). Higher growth rates were consistently observed at LL but significant differences were observed only for A. hermannii. Higher values of photoinhibition at LL were found for the three species, which is consistent with the dynamic photoinhibition as a reversible photoprotective mechanism against high irradiance. Light-induced decreases of effective quantum yield (EQY) were observed in the three species consisting of pronounced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Growth; Irradiance; Photosynthesis; Pigment; Red algae.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100003