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  • 1
    ISSN: 1432-2048
    Keywords: Key words: Ageing – Cell culture – Cell death –Chenopodium (cell culture) – Developmental phase – Phytohormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract.  Batch cultures of photoautotrophic cell suspensions of Chenopodiumrubrum L., growing in an inorganic medium on CO2 under a daily balanced light–dark regime of 16 : 8 h could be maintained for approximately 100 d without subcultivation. The long-lived cultures showed an initial cell division phase of 4 weeks, followed by a stationary phase of another 4 weeks, after which ageing and progressive cell death reduced the number of living cells and the cultures usually expired after another 3–4 weeks. These developmental phases of the cell culture were characterised with respect to photosynthetic performance, dark respiration, content of phytohormones and capacity of cell division. Cell division of the majority of the cells finished in the G1- or G0-phase of the cell cycle, caused by a pronounced decline in the endogenous levels of auxin and cytokinins. Supply of these growth factors to resting cells resulted in resumption of cytokinesis, at least by some of the cells. However, responsiveness to the phytohomones declined during the stationary phase, and subcultivation was no longer possible beyond day 60 when the phases of ageing and death commenced. Ageing was characterised by a further decline in the photosynthetic capacity of the cells, by a climacteric enhancement of dark respiration, but also by a slight increase in the level of IAA and cytokinins concomitant with a decrease in ethylene. Similarities and differences between the development of batch-cultured photoautotrophic cells of C. rubrum and that of a leaf are discussed with respect to using the cell culture as a model for a leaf.
    Type of Medium: Electronic Resource
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  • 2
  • 3
    Publication Date: 2013-12-04
    Description: A family of 17 putative preprotein and amino acid transporters designated PRAT has been identified in Arabidopsis thaliana, comprising PRAT proteins in mitochondria and chloroplasts. Although some PRAT proteins, such as the translocon of the mitochondrial inner membrane (TIM) proteins TIM22 and TIM23, play decisive roles for the translocation and...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 4
    Publication Date: 2000-02-18
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 5
    Publication Date: 2021-05-19
    Description: Daily topical application of the aqueous ethanolic extract of the marine sea grass, Thalassia testudinum, on mice skin exposed to UVB radiation resulted in a dose dependent recovery of the skin macroscopic alterations over a 6-day period. Maximal effect (90%) occurred at a dose of 240 μg/cm2, with no additional effects at higher doses. Bioassay-guided fractionation of the plant extract resulted in the isolation of thalassiolin B (1). Topical application of 1 (240 μg/cm2) markedly reduces skin UVB-induced damage. In addition, thalassiolin B scavenged 2,2-diphenyl-2-picrylhydrazyl radical with an EC50=100 μg/ml. These results suggest that thalassiolin B is responsible for the skin regenerating effects of the crude extract of T. testudinum
    Description: Published
    Description: Flavonoids, Thalassiolin B, DPPH scavenged, antioxidant activity, Skin regenerating activity, Thalassia testudinum
    Keywords: Chemistry ; Pharmacology ; Chemistry ; Pharmacology
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 6
    Publication Date: 2021-05-19
    Description: Las algas constituyen una fuente importante de compuestos de interés biomédico. En este estudio se presentan los resultados del pesquisaje realizado a extractos de 7 especies de algas en modelos de conducta exploratoria y convulsiones inducidas por choque eléctrico en ratones machos Balb-c y OF1 respectivamente, de 18-22 g de peso corporal; a dosis entre 40 - 1000 mg/Kg, v.o. (n= 10). Los resultados mostraron que la mayor dosis de los extractos de Dyctiota sp. y Turbinaria sp. disminuyeron significativamente la actividad exploratoria a un 34.9% y 41.6% respectivamente. El extracto de Sargassum sp. disminuyó significativamente la convulsión tónica inducida por el choque eléctrico a un 74.6 %. Estos resultados sugieren la presencia en estos extractos de compuestos con efectos sedante y anticonvulsivante. El extracto de Dyctiota sp. se evaluó en conducta motora y evitación activa en ratas hembras AXC de 200-250 g de peso corporal, así como en conducta exploratoria, laberinto en cruz, natación forzada y convulsiones inducidas por choque eléctrico en ratones machos Balb-c y OF1. Se ensayaron dosis entre 125-1000 mg/kg de peso. Las mayores dosis estudiadas produjeron una disminución de la conducta motora en ratas a 36% mientras que la actividad exploratoria se redujo a 14% en ratones. En el modelo de evitación activa a dosis de 125 y 250 mg/kg del extracto, se observó un enlentecimiento en el aprendizaje. Estos resultados sugieren un posible efecto sedante en este extracto lo que justifica el interés en continuar los estudios con esta especie por su posible interés terapéutico.
    Description: algas marinas, Sargassum sp., Dyctiota sp., Turbinaria sp.
    Repository Name: AquaDocs
    Type: Preprint
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  • 7
    Publication Date: 2021-05-19
    Description: Una marea negra provocada por el vertido deliberado o accidental de crudos de petróleo, aceite combustible, fangos o residuos petrolíferos y productos refinados, provoca un gran impacto sobre los ecosistemas marinos y costeros. En este trabajo, se desarrolla un producto compuesto por bacterias marinas inmovilizadas por atrapamiento en k- carragenina semirrefinada y en cuya formulación no se incluyen nutrientes. Los resultados muestran que la variante de inmovilización más ventajosa se obtuvo cuando fue empleada la κ-carragenina al 1% gelificada con una solución de KCL 1.5 M. Mediante análisis de Cromatografía Gaseosa de Alta Resolución y de espectroscopia (FTIR), se demostró la alta capacidad de degradación del bioproducto frente a petróleo del Yacimiento de Pina.
    Description: A black tide caused by the deliberate or accidental spills of raw petroleum, combustible oil, mires or oil residuals and refined products causes a great impact on the marine and coastal ecosystems. This work present the development of a product composed of bacteria marine immobilized by entrapped in k–carrageenan. Its formulation does not included nutrients. The results show that the variant of more advantageous immobilization was obtained when using k-carrageenan at 1-% jellified with a solution of KCL 1.5M. By means analysis of High Resolution Gas Chromatography and of Spectroscopy (FTIR), the high degrading capacity of this bioproduct was demonstrated before oil from Pina oil field.
    Description: Bioremediation, k–carragenin and microorganisms
    Keywords: Immobilization ; Immobilization ; Oil
    Repository Name: AquaDocs
    Type: Preprint
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  • 8
    Publication Date: 2021-05-19
    Description: Ha sido demostrado, por otros autores, que el alga Ulva fasciata Delile posee una actividad antioxidante promisoria y en el presente trabajo evaluamos si la actividad antioxidante de muestras de esta alga puede ser influenciada por la adsorción de metales, pesados y otros por parte del alga. U. fasciata fue colectada en tres zonas de las costas de la Ciudad de la Habana que presentan diferentes niveles de eutrofización: 1) la desembocadura del Río Quibú, un río que atraviesa una importante zona industrial de la capital cubana y en la cual la concentración de metales acumulados por el alga fue mayor; 2) la zona del Malecón habanero, que recibe la contaminación de la bahía de la Habana y del Río Almendares pero no de forma directa, donde presentó valores intermedios de la adsorción de metales y 3) la Playa Bacuranao, una zona turística con menor nivel de contaminación en sus aguas y donde el nivel de metales adsorbido por el alga fue menor. Los extractos obtenidos de las algas colectadas en la desembocadura del Río Quibú presentaron una mayor actividad antioxidante y menor fue la actividad de los obtenidos de las algas de la Playa Bacuranao, mientras que los extractos de las algas del Malecón habanero tuvieron una actividad intermedia.
    Description: Published
    Description: Actividad antioxidante, Ulva fasciata Delile
    Keywords: Marine environment ; Heavy metals ; Algae ; Algae ; Marine environment ; Heavy metals
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 9
    Publication Date: 2021-05-19
    Description: The Cuban marine flora and fauna is characterized by its richness in species that represents an extraordinary natural source of unexplored biomolecular diversity. Many of those biomolecules could represent important tools for industrial applications. For this reason, in our Centre the main aim was focused on the isolation, purification and characterization of bioactive compounds present in marine invertebrates with particular emphasis on sponges, cnidarians, seaweeds and marine plants. Micro organisms represent also an important source of biologically active compounds that were included in our studies. In our Institution, research is performed by a multidisciplinary team. The purpose of this article is to review the most important results of the Centre of Marine Bioproducts in the last few years.
    Description: Published
    Description: sustainable use, marine bioproducts.
    Keywords: Marine organisms
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 10
    Publication Date: 2021-05-19
    Description: Las algas constituyen un recurso natural de gran variedad y abundancia en los arrecifes coralinos cubanos. En la literatura científica han sido descritos efectos de extractos y compuestos aislados de algas pardas sobre el Sistema Nervioso Central, entre ellos, acciones depresora, antidepresiva y anticonvulsivante. En este estudio se presentan los resultados obtenidos en la evaluación neurofarmacológica de los extractos etanólicos (10%) procedentes de las algas pardas: Dictyota pinnatifida y Turbinaria turbinata sobre la conducta exploratoria, tiempo de sueño inducido por tiopental y prueba de esconder esferas. Se utilizaron ratones, albinos, machos, de la línea OF-1, de peso corporal entre 18 y 22 gramos y se emplearon dosis de 40, 200 y 1000 mg/kg, por vía oral. Los extractos de D. pinnatifida (40 mg/kg) y T. Turbinata (200 y 1000mg/kg) disminuyeron significativamente la actividad exploratoria, lo cual pudiera relacionarse con la presencia de terpenos en los mismos. En la prueba de tiempo de sueño la dosis de 1000 mg/kg del extracto de D. pinnatifida produjo una potenciación significativa de su duración, mientras que la administración del extracto de T. turbinata no modificó la duración del tiempo de sueño pero aumentó significativamente el período de latencia (40 y 1000 mg/kg). En la prueba de esconder esferas, la dosis de 1000 mg/kg de ambos extractos disminuyó significativamente el número de esferas escondidas, lo que indica la presencia de compuestos con efecto ansiolítico. Los resultados sugieren que ambos extractos presentan efectos de sedación y ansiolíticos. Se discute el interés e importancia en continuar las investigaciones en esta temática.
    Description: The algae constitute a natural resource of great variety and abundance in the Cuban coralline reefs. In the scientific literature actions of extracts and isolated compounds of brown algae have been described on the Nervous System, among them, depressant, antidepressive and anticonvulsivant effects. In this study the results obtained in the neuropharmacological evaluation of ethanolic extracts (10%) coming from brown algae: Dictyota pinnatifida and Turbinaria turbinata are presented. The models employees were the following ones: exploratory behavior, sleeping time induced by thiopental and marble burying test. Groups of 10 mice albino males were used, (OF-1 line, 18-22 g of corporal weight). The extracts of D. pinnatifida (40 mg/kg) and T. Turbinata (200 and 1000mg/kg) diminished significantly the exploratory activity, and this effect could be related with the presence of terpens in the same ones. In the test of sleeping time induced by thiopental the dose of 1000 mg/kg of the extract of D. pinnatifida produced a significant potentiation of its duration, while the administration of the extract of T. turbinata didn't modify the duration of the sleeping time but it increased significantly the period of latency (40 and 1000 mg/kg. In the marble burying test, the dose of 1000 mg/kg of both extracts diminished the number of hidden spheres significantly, suggesting an anxiolytic effect. It is discussed the interest and importance in continuing the investigations in this field.
    Description: Brown Algae, exploratory behavior; Sleeping time; Marble burying test; Anxiolytic; Dictyota pinnatifida; Turbinaria turbinata.
    Repository Name: AquaDocs
    Type: Preprint
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