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Publications
Publications (33)
Cyanobacteria, also called blue-green algae, are a group of prokaryotic microorganisms largely distributed in both terrestrial and aquatic environments. They produce a wide range of bioactive compounds that are mostly used in cosmetics, animal feed and human food, nutraceutical and pharmaceutical industries, and the production of biofuels. Nowadays...
In recent years, the control of fungal plant pathogens in agriculture is facing new challenges since the use of synthetic pesticides has been restricted by EU legislation for human health and environmental pollution issues. The Directive 2009/128/EC recommends, whenever possible, alternatives to synthetic products for plant disease control, includi...
Cyanobacteria are oxygenic phototrophs that have an essential role in soil N2 fixation, fertility, and water retention. Cyanobacteria are also natural sources of bioactive metabolites beneficial to improve plant vigor and potentially active against fungal plant pathogens. Therefore, we studied the antifungal activity of water extract (WE) and phyco...
In recent years, the use of synthetic pesticides in agriculture has been restricted for environmental pollution issues. Alternatives to chemicals for plant disease control are highly recommended by the recent EU legislation. We tested tomato seed treatment with water extracts from Anabaena minutissima, Ecklonia maxima, and Jania adhaerens for their...
Phycobiliproteins (PBPs) are proteins of cyanobacteria and some algae such as rhodophytes. They have antimicrobial, antiviral, antitumor, antioxidative, and anti-inflammatory activity at the human level, but there is a lack of knowledge on their antifungal activity against plant pathogens. We studied the activity of PBPs extracted from Arthrospira...
Activity-guided fractionations from the freshwater cyanobacterium Nodularia harveyana led to the isolation of two monogalactosyldiacylglycerols (MGDG), two digalactosyldiacylglycerols (DGDG), two monoglucosyldiacylglycerols (MGlcDG) and 1-(O-hexose)-3,25-hexacosanediol (HG). Structures were elucidated by a combination of 1D and 2D NMR analysis, HRM...
Three carbamidocyclophanes, A, F and V, and carbamidocylindrofridin A were isolated from the cultured freshwater cyanobacterium Cylindrospermum stagnale, collected in the Canary Islands. The chemical structures of these compounds were elucidated through NMR, HRMS and ECD spectroscopy. The absolute configuration of carbamidocyclophane A was confirme...
Aqueous extracts from Anabaena minutissima BEA 0300B (ANA), Ecklonia maxima (ECK) and Jania adhaerens (JAN) were evaluated for their antifungal effect against powdery mildew disease caused by Podosphaera xanthii on cucumber detached cotyledons and seedlings. All the extracts were sprayed on detached cotyledons at 2.5, 5.0 and 10.0 mg dry biomass mL...
To uncover the potential of Pavlova pinguis J.C. Green as a natural source of value added compounds, its lipophilic extracts were studied before and after alkaline hydrolysis using gas chromatography-mass spectrometry (GC-MS). The GC-MS analysis of the lipophilic extracts showed a wide chemical diversity including 72 compounds distributed by fatty...
Water extracts and polysaccharides from Anabaena sp., Ecklonia sp., and Jania sp. were tested for their activity against the fungal plant pathogen Botrytis cinerea. Water extracts at 2.5, 5.0, and 10.0 mg/mL inhibited B. cinerea growth in vitro. Antifungal activity of polysaccharides obtained by N-cetylpyridinium bromide precipitation in water extr...
Cybastacines A (1) and B (2) were discovered as a novel pentacyclic sesterterpenoid-alkaloid skeleton structure, with a guanidinium group. These molecules were isolated from a Nostoc sp. cyanobacterium collected in the Canary Islands. Their structures were elucidated primarily by a combination of spectroscopic analyses and X-ray diffraction. These...
La Laguna Verde del Golfo (Charca de Los Clicos) está situada en el Oeste de la isla de Lanzarote, dentro de los límites del Parque Nacional de Timanfaya, Es una charca hipersalina que ocupa la trasplaya del Golfo. Debido a las extracciones de arena en la playa durante la década de los sesenta la playa perdió el apoyo Sur, retrocediendo la línea de...
The “Charco Verde de Los Clicos” is a hypersaline green coastal lagoon located at the west coast of Lanzarote Island. It is separated from the sea by a black sand barrier, but it is connected with the sea by underground channels. It is part of a semi-submerged hydro-volcanic building. The surface and volume of the lagoon is 7.700m2 and 17.700m3 wit...
PREMISE OF THE STUDY: To enhance our knowledge of the diversity of microalgae, a phycological survey of the Canary Islands (Spain) was undertaken. Here we report the discovery of a (semi)terrestrial green filamentous alga isolated from a steep volcanic canyon on La Palma. This alga is continually exposed to changing weather conditions (floods vs. d...
The effect of exudates from Phaeodactylum tricornutum on the iron chemistry has been studied at pH 8.0 and 7.5 in seawater and seawater enrichment with the diatom exudates. At pH 8.0 the rate constant for the oxidation of Fe(II) decreased by 29% in the presence of the exudates, while at pH 7.5, the rate constant decreased by 56%. At the stationary...
A bloom of the non-heterocystous diazotrophic cyanobacterium Trichodesmium ery- thraeum Ehrenberg is reported in the Canary Islands Archipelago during August of 2004, the warmest period of a meteorological series recorded by the National Institute of Meteorology (Spain) since 1912. Samples showed massive occurrences of T. erythraeum (1000 filaments...
Since flow cytometry allows rapid,simultaneous and quantitative measurementsrelated to cell morphology andphysiologicy, the lipid-specificfluorescent dye, Nile Red, was employed forthe in vivo lipid quantification of Crypthecodinium cohnii, a heterotrophicmarine dinoflagellate rich inpolyunsaturated long chain fatty acids. Thefluorescence signal wa...
The variation of the fatty acid profile and the carotene content of Dunaliella salina in response to irradiance (80, 128,
640, 1000, 1500 μmol photon m−2 s−1) and nitrogen starvation were analysed. The highest fatty acid content per cell and the least polyunsaturated fatty acid
percentage were exhibited under 1500 μmol photon m−2 s−1. Furthermore,...
Arginase, ornithine carbamoyl transferase (OCT) and arginine deiminase activities were found in cell-free extracts of Nostoc PCC 73102, a free-living cyanobacterium originally isolated from the cycad Macrozamia. Addition of either arginine, ornithine or citrulline to the growth medium induced significant changes in their in vitro activities. Moreov...
Cells ofNostoc PCC 73102, a free-living cyanobacterium originally isolated from the cycadMacrozamia, were cultured under different conditions and examined for the presence ofin vitro active ornithine carbamoyl transferase (OCT). Cells grown in darkness showed a significant increase ofin vitro OCT activity compared with the activity when grown in li...
Projects
Projects (3)
REBECA 2 proposes the bioprospecting of microalgae, primary producers of the trophic chain of ecosystems and physical and nutritional support of the biotope, to maintain biodiversity ex-situ and study its maintenance in-situ. Likewise, it raises the cultivation of isolated strains and the valorization of the biomass produced in a sustainable way to provide solutions to the main disciplines that contribute to solving major social challenges: healthy food, energy supply, climate change, and health care.
The ATOPFe Project will study the effects of pH, temperature, and organic matter (TOC) on Fe (II) oxidation kinetics and its persistence in the ocean. Three specific regions: polar, subtropical and submarine volcanic regions, have been selected as the fundamental basis for comparing laboratory studies and developing a kinetic model for iron in the context of ocean acidification and warming.
The main goal of the EACFe project is to investigate which compounds and mechanisms determine the presence of Fe(II) in the marine environment and how the presence of organic matter, ocean acidification and global warming affect them.
The main goals of the EACFe project is to investigate which compounds and mechanisms determine the presence of Fe(II) in the marine environment and how ocean acidification and global warming affect them.
To achieve these goals we will combine the studies in the Atlantic Subarctic region, one of the most sensitive to ocean acidification, with studies in the lab using individual organic compounds and the exudates from cultures of phytoplankton. In the lab studies we will consider the different variables independently in order to define the contribution of each one to the process.
