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  • 550 - Earth sciences  (9)
  • Compositae  (3)
  • Cardisoma guanhumi  (2)
  • Oil body
Collection
Publisher
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 28 (1989), S. 2593-2595 
    ISSN: 0031-9422
    Keywords: Compositae ; Helianthus annuus ; high oleic acid mutant. ; oleate desaturation ; sunflower, seeds
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 28 (1989), S. 2597-2600 
    ISSN: 0031-9422
    Keywords: Compositae ; Helianthus annuus ; fatty acid composition ; high oleic acid mutant. ; lipids ; seeds ; sunflower
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 30 (1991), S. 2127-2130 
    ISSN: 0031-9422
    Keywords: Compositae ; Helianthus annuus ; high oleic mutant ; microsomes ; oleate desaturase ; seeds ; sunflower ; temperature control.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2048
    Keywords: Key words:Helianthus (seed) ; Microsome ; Oil body ; Oleate desaturase ; Temperature adaptation ; Triacylglycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. In-vivo experiments with developing sunflower (Helianthus annuus L.) seeds demonstrated that oleate desaturase activity was stimulated by low temperature (10 °C), repressed by high temperature (30 °C) and rapidly restored by returning the seeds to low temperature. Within time periods of 2–4 h, in which the de-novo fatty acid synthesis was negligible, the percentages of oleate (18:1) and linoleate (18:2) were modified in the seed lipids as a consequence of temperature adaptation. When the seeds were transferred to low temperature, the 18:2 content increased in all lipids from both microsomal membranes and oil bodies. After shifting to high temperature, the overall 18:2 content remained constant, but the 18:2 content decreased in diacylglycerols, phosphatidylcholine (PC) and other polar lipids of the two fractions and also in triacylglycerols (TAGs) of the microsomes but increased in TAGs of the oil bodies. The results indicate that the mechanism for the rapid adaptation of sunflower seeds to temperature changes involves (i) the synthesis or activation of oleate desaturase at low temperature and the reversible inhibition of this enzyme at high temperature and (ii) the exchange of 18:1 and 18:2 between TAGs and PC. Under both low and high temperature, 18:1 is transferred from reserve TAGs to PC and 18:2 is transferred from PC to reserve TAGs. At low temperature, 18:1 is desaturated to 18:2 thus allowing the enrichment of membrane lipids with 18:2, the excess being stored in reserve TAGs. At high temperature, however, and provided that oleate desaturase is repressed, the membrane lipids become enriched in 18:1 and the oil-body TAGs become enriched in 18:2.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2048
    Keywords: Helianthus ; Microsome ; Oil body ; Oleate desaturation ; Seed (fatty acids) ; Triacylglycerol metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract For the first time, an active fatty-acid metabolism is indicated for triacylglycerols (TAG) of developing sunflower (Helianthus annuus L.) seeds. When the developing seeds were transferred to low temperature, the total amount of oleate found in TAG decreased as that of linoleate increased, while the contents of total lipids and TAG remained unchanged. These results suggest that oleate from TAG was used for desaturation. This occurred first in microsomal TAG, but after a long cold period it was observed mainly in the oil-body fraction. Thesn-2 position of TAG was preferentially enriched in linoleate. Apparently, more linoleate than necesary for the maintenance of membrane fluidity was synthesized at the expense of TAG oleate.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2021-05-19
    Description: El cangrejo de tierra Cardisoma guanhumi, (Latreille, 1825) habita en el Parque Nacional Ciénaga de Zapata y constituye un recurso de importancia comercial. Se determinó la densidad media de la población de C. guanhumi en las zonas de captura Guamutal, El Maíz, La Arenera y Bolanio. Se utilizó un método de estimación indirecta y se muestrearon 11 parcelas de 81 m2 en febrero/2013 para un área total de 748 m2; además, se realizaron muestreos mensuales durante la temporada de captura (mayo, junio y julio del 2013). La densidad media de cuevas varió de 0,52 a 2,23 cuevas/m2, con una media de 1,43 cuevas/m2. La zona de mayor densidad fue La Arenera con 1,81 cuevas/m2 y la menor Bolanio con 0,52 cuevas/m2. El diámetro promedio de las cuevas fue de 10,13 ± 0,34 cm, 7,74 ± 0,56 cm y 5,59 ± 0,30 cm en El Maíz, La Arenera y Guamutal respectivamente. Se observaron diferencias significativas entre los diámetros medios. Los valores de menor diámetro en Guamutal refuerzan la hipótesis de que ésta constituye una zona de reclutamiento. La talla media del cangrejo disminuye a medida que trascurre la corrida. La captura posee un esquema de “Libre Acceso” y por ello se considera al cangrejo explotado intensamente, con disminución de la talla media de captura e incremento de ejemplares por debajo de la talla mínima legal. La presencia de cangrejos está asociada a los mangles Laguncularia racemosa y Conocarpus erectus. La fauna asociada a C. guanhumi la constituyen cangrejos ermitaños (Eupagurus sp.), cocodrilos (Crocodylus rhombifer) y perros jíbaros (Canis familiares).
    Description: At the National Park, Cienaga de Zapata inhabits the land crab (Cardisoma guanhumi, Lattreille, 1825) constituting a resource of commercial importance. To determinate the average density of the population in the catchment areas Guamutal, El Maiz and La Arenera, it was used an indirect method; it were sampled 11 locations with 81 m2 at febrary/2013 for a total area of 748 m2. Also there were done monthly samples to the capture during the capture season. The caves average density varied from 0,52 to 2,23 caves/m2, with an overall average of 1,43 caves/m2. The area most densely populated was La Arenera with 1,81 caves/m2 and the lower was Bolanio with 0,52 caves/m2. The average diameter of the caves was 10,3±0,34cm, 7,74±0,56cm and 5,59±0,30cm in El Maiz, La Arenera and Guamutal respectively. There is significant difference between the mean diameters. The presence of small diameters caves in Guamutal reinforces the hypothesis that this is the main area of recruitment. The crab average size decrease along the capture season. His capture has a “Free Access” scheme and crab is considered as intensely exploited. The percentage of specimens below the legal minimum size has been increased and therefor the average size has decreased. The crab presence is associated with gender mangrove, Laguncularia racemosa and Conocarpus erectus. In the fauna associated with C. guanhumi there were observed the hermit crabs (Eupagurus sp.), crocodiles (Crocodylus rhombifer) and wild dogs (Canis familiares).
    Description: Published
    Keywords: Cardisoma guanhumi ; Densidad de población ; Diámetro de cuevas ; Flora y fauna asociada ; Cuba ; Population density ; Caves diameter ; Flora y fauna associated
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.110-124
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  • 7
    Publication Date: 2021-05-19
    Description: El cangrejo de tierra Cardisoma guanhumi, (Latreille, 1825) habita en el Parque Nacional Ciénaga de Zapata y constituye un recurso de importancia comercial. Se determinó la densidad media de la población de C. guanhumi en las zonas de captura Guamutal, El Maíz, La Arenera y Bolanio. Se utilizó un método de estimación directa y se muestrearon 11 parcelas de 81 m2 en febrero/2013 para un área total de 748 m2; además, se realizaron muestreos mensuales durante la temporada de captura (mayo, junio y julio del 2013). La densidad media de cuevas varió de 0,52 a 2,23 cuevas/m2, con una media de 1,43 cuevas/m2. La zona de mayor densidad fue La Arenera con 1,81 cuevas/m2 y la menor Bolanio con 0,52 cuevas-m2. El diámetro promedio de las cuevas fue de 10,13 +- 0,34 cm, 7,74 +- 0,56 cm y 5,59 +- 0,30 cm en El Maíz, La Arenera y Guamutal respectivamente. Se observaron diferencias significativas entre los diámetros medios. Los valores de menor diámetro en Guamutal refuerzan la hipótesis de que esta constituye una zona de reclutamiento. La talla media del cangrejo disminuye a medida que transcurre la corrida. La captura posee un esquema de "Libre Acceso" y por ello se considera al cangrejo explotado intensamente, con disminución de la talla media de captura e incremento de ejemplares por debajo de la talla mínima legal. La presencia de cangrejos está sociada a los mangles Laguncularia racemosa y Conocarpus erectus. La fauna asociada a C. guanhumi la constituyen cangrejos ermitaños (Eupagurus sp.), cocodrilos (Crocodylus rhombifer) y perros jíbaros (Canis familiares).
    Description: At the National Park, Cienaga de Zapata inhabits the land crab (Cardisoma guanhumi, Latreille, 1825) constituting a resource of commercial importance. To determinate the average density of the population in the catchment areas Guamutal, El Maíz and La Arenera, it was used and indirect method; it were sampled 11 locations with 81 m². Also there were done monthly samples to the capture during the capture season. The caves average density varied from 0.52 to 2.23 caves/m², with an overall average of 1.43 caves/m². The area most densely populated was La Arenera with 1.81 caves/m² and the lower was Bolanio with 0.52 caves/m². The average diameter of the caves was 10,13 ± 0,34 cm, 7,74 ± 0,56 cm and 5,59 ± 0,30 cm in El Maíz, La Arenera and Guamutal respectively. There is significant differences between the mean diameters. The presence of small diameter caves in Guamutal reinforce the hypothesis that this is the main area of recruitment. The crab average size decreases along the capture season. His capture has a "Free Access" scheme and crab is considered as intensely exploited. The percentage of specimens below the legal minimum size has been increased and therefor the average size has decresead. The crabs presence is associated with gender mangroves, Laguncularia racemosa and Conocarpus erectus. In the fauna associated with C. guanhumi there were observed the hermit crabs (Eupagurus sp.), crocodiles (Crocodylus rhombifer) and wild dogs (Canis familiaris).
    Description: Published
    Keywords: Cardisoma guanhumi ; Densidad de población ; Diámetro de cuevas ; Flora y fauna asociada ; Population density ; Caves diameter ; Flora and fauna associated
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.110-124
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  • 8
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 9
    Publication Date: 2020-02-12
    Description: The Iberian–Roman Humid Period (IRHP, 2600–1600 cal yr BP), is the most humid phase of the last 4000 yr in southern Spain as recorded in the sedimentary sequence of Zoñar Lake (37°29′00″N, 4°41′22″ W, 300 m a.s. l.). A varve chronology supported by several AMS 14C dates allows study of the lake evolution at annual scale in response to human impact and climate changes. There are four climate phases within this period: i) gradual transition (2600–2500 yr ago, 650–550 BC) from a previous arid period; ii) the most humid interval during the Iberian–Early Roman Epoch (2500–2140 yr ago, 550–190 BC); iii) an arid interval during the Roman Empire Epoch (2140–1800 yr ago, 190 BC AD 150); and iv) a humid period synchronous with the decline of the Roman Empire (1800–1600 yr ago, AD 150–350). Varve thickness and geochemical proxies show a multi-decadal cyclicity similar to modern North Atlantic Oscillation (NAO) (60, 20 years) and solar variability cycles (11 yr). The timing and the structure of this humid period is similar to that described in Eastern Mediterranean and northern European sites and supports the same large-scale climate control for northern latitudes and the Mediterranean region.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 10
    Publication Date: 2020-02-12
    Description: A combination of marine (Alboran Sea cores, ODP 976 and TTR 300 G) and terrestrial (Zo˜nar Lake, Andalucia, Spain) geochemical proxies provides a highresolution reconstruction of climate variability and human influence in the southwestern Mediterranean region for the last 4000 years at inter-centennial resolution. Proxies respond to changes in precipitation rather than temperature alone. Our combined terrestrial and marine archive documents a succession of dry and wet periods coherent with the North Atlantic climate signal. A dry period occurred prior to 2.7 cal ka BP – synchronously to the global aridity crisis of the third-millennium BC – and during the Medieval Climate Anomaly (1.4–0.7 cal ka BP).Wetter conditions prevailed from 2.7 to 1.4 cal ka BP. Hydrological signatures during the Little Ice Age are highly variable but consistent with more humidity than the Medieval Climate Anomaly. Additionally, Pb anomalies in sediments at the end of the Bronze Age suggest anthropogenic pollution earlier than the Roman Empire development in the Iberian Peninsula. The Late Holocene climate evolution of the in the study area confirms the see-saw pattern between the eastern and western Mediterranean regions and the higher influence of the North Atlantic dynamics in the western Mediterranean.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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