Recursos de colección

Digital.CSIC (162.855 recursos)

Repositorio institucional del Consejo Superior de Investigaciones Científicas. Digital.CSIC es un depósito de documentos digitales, cuyo objetivo es organizar, archivar, preservar y difundir en modo de acceso abierto la producción intelectual resultante de la actividad investigadora del CSIC.

(IG) Artículos post-print

Mostrando recursos 1 - 16 de 16

  1. Diet Explains Interpopulation Variation of Plasma Carotenoids and Skin Pigmentation in Nestling White Storks

    Negro, Juan J.; Tella, José Luis; Blanco, Guillermo; Forero, Manuela G.; Garrido Fernández, J.
    Carotenoids have a dietary origin in birds, but mechanisms by which they are absorbed in the gut, transported in the blood, metabolized at various sites, and deposited in the integument remain poorly understood. Variation in both plasma carotenoid levels and external color may reflect different access to dietary carotenoids or individual physiological differences in the uptake and deposition of carotenoids. We compared total plasma ca- rotenoid concentration in nestling white storks (Ciconia ci- conia) from 11 Spanish colonies in two consecutive years. The main food item in one of the colonies was the red swamp crayfish (Procambarus clarkii), a recently...

  2. Astaxanthin is the major carotenoid in tissues of white storks (Ciconia ciconia ) feeding on introduced crayfish (Procambarus clarkii )

    Negro, Juan J.; Garrido Fernández, J.
    We studied the carotenoid pigments in plasma, skin and body fat of white storks (Ciconia ciconia ) from a colony in Spain feeding mainly on the recently introduced red swamp crayfish (Procambarus clarkii ). In control colonies, where crayfish was absent, plasma was collected for comparison. Our objective was to determine whether the astaxanthin contained in the crayfish reached the blood, accumulated in fat, and finally was deposited in the red-colored bill and legs. If that was true, the visual cues provided by those tegumentary areas would be altered, with potential behavioral consequences. Plasma carotenoids were directly extracted with acetone,...

  3. Fat stores in birds: an overlooked sink for carotenoid pigments?

    Negro, Juan J.; Figuerola, Jordi; Garrido Fernández, J.; Green, Andy J.
    Peer reviewed

  4. Astaxanthin from crayfish (Procambarus clarkii) as a pigmentary ingredient in the feed of laying hens

    Pérez Gálvez, Antonio; Mínguez Mosquera, María Isabel; Negro, Juan J.; Garrido Fernández, J.; Cascajo Almenara, M. V.
    7 pages, 4 figures, 3 tables.

  5. Environmental constraints for plumage melanization in the northern goshawk Accipiter gentilis

    Galván, Ismael; Bijlsma, R. G.; Negro, Juan J.; Jarén-Galán, Manuel; Garrido Fernández, J.
    Although it is recognized that certain environmental factors are important determinants of the expression of melanin- based traits, their influence in wild populations of animals is poorly known. One of these factors is the availability of amino acids that serve as precursors of melanins. Here we measured eumelanin and pheomelanin content in feathers of northern goshawk Accipiter gentilis nestlings, hypothesizing that, if the availability of melanin precursors is related to food abundance and habitat quality, plumage melanization should be affected by those variables. Although the eumelanin content increased with food abundance as predicted, the levels of this variable were higher...

  6. Endogenous enzymes involved in the transformation of oleuropein in Spanish table olive varieties

    Ramírez, Eva; Medina Pradas, Eduardo; Brenes Balbuena, Manuel; Romero Barranco, Concepción
    © 2014 American Chemical Society. The main Spanish table olive varieties supplied by different olive cooperatives were investigated for their polyphenol compositions and the endogenous enzymes involved in their transformations during two growing seasons. Olives of the Manzanilla variety had the highest concentration in total polyphenols, followed by the Hojiblanca and Gordal varieties. The Gordal and Manzanilla cultivars showed the highest polyphenol oxidase activities. The Gordal cultivar presented a greater β-glucosidase and esterase activity than the others. An important influence of pH and temperature on the optimal activity of these enzymes was also observed. The polyphenol oxidase activity increased with...

  7. Selection for Some Olive Oil Quality Components through the Analysis of Fruit Flesh

    Velasco Varo, Leonardo; Fernández de la Cuesta, Álvaro; Rosa, Raúl de la; Ruiz Méndez, Mª Victoria; León, Lorenzo
    Selection for oil quality is commonly conducted at the latest stages of olive breeding programs, as oil quality traits are measured in extracted oils. At the initial stages of breeding, the number of genotypes is high and fruit production is low, which makes it difficult to conduct oil extraction. The objective of this research was to evaluate the feasibility of conducting selection for some important oil quality traits in olive by analyzing fruit flesh instead of extracted oils. Fatty acids, tocopherols, phytosterols, and squalene were measured in fruit flesh and extracted oils from 22 individual olive trees showing variability for...

  8. Novel safflower oil with high γ-tocopherol content has a high oxidative stability

    Fernández-Cuesta, Álvaro; Velasco Varo, Leonardo; Ruiz Méndez, Mª Victoria
    Safflower oil, either with high linoleic acid or high oleic acid content, has a tocopherol profile dominated by α-tocopherol. Novel safflower germplasm that accumulates predominantly γ-tocopherol in seeds instead of α-tocopherol has been developed. The objective of this research was to evaluate the chemical properties and stability of safflower oil with high oleic acid and γ-tocopherol contents, produced by either mechanical pressing or solvent extraction from seeds of safflower line IASC-2. Safflower oil with high oleic acid and α-tocopherol contents from seeds of safflower line CR-6 was used as a control. Seeds of IASC-2 had low oil content (22.2% compared...

  9. Identification and characterization of antioxidant peptides from chickpea protein hydrolysates

    Torres-Fuentes, Cristina; Contreras, María del Mar; Recio, Isidra; Alaíz Barragán, Manuel; Vioque, Javier
    Oxidative stress due to the excess of radical oxygen species (ROS) contribute to the development of different diseases. The use of antioxidants may prevent the development of these diseases by counteracting ROS levels. There is an increasing interest in natural antioxidants as they are safer for consumers than synthetic antioxidants. In this work, reducing power, free radical scavenging and cellular antioxidant activities of chickpea peptides fractions have been investigated. Peptide sequences included in fractions with antioxidant activity were identified. Main sequences, ALEPDHR, TETWNPNHPEL, FVPH and SAEHGSLH, corresponded to legumin, the main seed protein. Most peptides contained histidine, which has shown...

  10. The liver but not the skin is the site for conversion of a red carotenoid in a passerine bird

    Val, Esther del; Senar, Juan Carlos; Garrido Fernández, J.; Jarén-Galán, Manuel; Borràs, Antoni; Cabrera, Josep; Negro, Juan J.
    Carotenoids may provide numerous health bene- fits and are also responsible for the integumentary colora- tion of many bird species. Despite their importance, many aspects of their metabolism are still poorly known, and even basic issues such as the anatomical sites of conversion remain controversial. Recent studies suggest that the transformation of carotenoid pigments takes place directly in the follicles during feather growth, even though the liver has been previously recognised as a storing organ for these pigments with a certain potential for conversion. In this context, we analysed the carotenoid profile of plasma, liver, skin and feathers of male...

  11. Hepatic conversion of red carotenoids in passerine birds

    Val, Esther del; Senar, Juan Carlos; Garrido Fernández, J.; Jarén-Galán, Manuel; Borràs, Antoni; Cabrera, Josep; Negro, Juan J.
    Peer reviewed

  12. Two pieces of information in a single trait? The yellow breast of the great tit (Parus major) reflects both pigment acquisition and body condition

    Senar, Juan Carlos; Negro, Juan J.; Quesada, Javier; Ruiz, Iker; Garrido Fernández, J.
    Carotenoid-based plumage coloration has been shown to be dependent both on pigment content and feather structure. Against this background, we predict a relationship between feather pigment content and plumage hue. Furthermore, given the susceptibility of chroma to developmental perturbation of feather structure, we predict body condition to be related to chroma. We tested these predictions in the great tit, Parus major. Carotenoid content in yellow breast feathers was analysed by high-performance liquid chromatography (HPLC). Lutein was the main carotenoid contained in great tit feathers, followed by zeaxanthin. The hue of the feathers was accurately predicted from their lutein concentration, and chroma was predicted from the body condition value....

  13. La Antracnosis del olivo y su efecto en la calidad del aceite

    Moral Moral, Juan; Xavier, José C.; Roca, Luis F.; Moreda, Wenceslao; Trapero, Antonio
    [ES] El olivo (Olea europaea subsp. europaea var. europaea) es uno de los primeros cultivos leñosos domesticados. Actualmente el olivo se encuentra ampliamente distribuido por todas las regiones de clima mediterráneo. La Antracnosis, causada por las especies complejas Colletotrichum acutatum y C. gloeosporioides, es la enfermedad del olivo que más afecta a la calidad del aceite. Aun así, el efecto de la Antracnosis en la calidad del aceite es ampliamente desconocido. Por lo que creemos esencial que se afronten estudios encaminados a dilucidar el efecto de las especies del patógeno, el cultivar de olivo y el tipo (latente o visible)...

  14. Antifungal activity of asparagus extracts against phytopathogenic Fusarium oxysporum

    Rosado Álvarez, C.; Molinero-Ruiz, Leire; Rodríguez Arcos, Rocío; Basallote-Ureba, M. José
    Asparagus, carnation and strawberry are major horticultural crops in southern Spain, where diseases caused by soilborne pathogens are frequent. Among them, Fusarium spp. are the fungi more frequently associated to the infection of underground plant organs. Flavonoids are phenolic compounds which possess a wide range of biological activities, including antifungal activity. In this work we evaluated the in vitro effect of an extract enriched in flavonoids obtained from triguero asparagus by-products against Fusarium oxysporum pathogenic to asparagus, carnation and strawberry, as well as its safety in asparagus plants. A significant inhibition of mycelial growth and sporulation of F. oxysporum f....

  15. Unusual Michael reaction of acyclic 1,3-dicarbonyl compounds with nitro-olefins. A novel pyrrole synthesis

    Gómez-Sánchez, Antonio; Stiefel, Berta M.; Fernández-Fernández, R.; Pascual, Conrado; Bellanato, Juana
    Acetoacetic esters and pentane-2,4-dione undergo unusual Michael reactions with β-nitrostyrene in methanol-sodium methoxide to form the(2R,3R,2′S,3′S)-bis-(4-acyl-2,3-dihydro-5-methyl-3-phenyl-2) -furylhydroxylamines (5) in high yields. The normal adducts (6) are intermediates in these reactions. Acetylation of compounds (5) gives the hydroxylamine O-acetates (7). Compounds (5) react with ammonia and amines in methanol to give the 3-acylpyrroles (9) which can be isolated in high yields. These pyrroles can be easily obtained in high yields in a one-pot process by reaction of the 1,3-dicarbonyl compound with β-nitrostyrene and subsequent treatment of the reaction mixture with ammonia or amines. A mechanism for the formation of the unusual...

  16. Coprophagy: An unusual source of essential carotenoids A yellow-faced vulture includes ungulate faeces in its diet for cosmetic purposes.

    Negro, Juan J.; Grande, Juan Manuel; Tella, José Luis; Garrido Fernández, J.; Hornero-Méndez, Dámaso; Donázar, José A.; Sánchez-Zapata, José A.; Benítez, J. R.; Barcell, M.
    The rare Egyptian vulture (Neophron percnopterus) stands out among the Old World vultures (Family Accipitridae) because of its brightly ornamented head1, which is coloured yellow by carotenoid pigments, and its practice of feeding on faeces. Here we show that Egyptian vultures obtain these pigments from the excrement of ungulates. To our knowledge, this is the first demonstration that faeces can be used as a source of carotenoids by a vertebrate.

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