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  • 1
    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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  • 2
    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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  • 3
    Publication Date: 2021-05-19
    Description: Se determinó la biomasa del camarón rosado Farfantepenaeus notialis presente en el golfo de Ana María durante el periodo 1997-2010 mediante análisis estadístico de captura por edades (SCA). Esta se incrementó a partir del año 2008 como respuesta al aumento del reclutamiento, cuyo promedio anual presenta sus mayores valores en julio, noviembre y marzo. La entrada de reclutas (pre-adultos) al área de pesca ocurre por dos zonas principales, frente a los cayos de Ana María, y en Sta. Cruz Abajo, al norte de la porción sur de los cayos de las Doce Leguas. Una pesquería a finales del año puede provocar una sobrepesca del crecimiento y afectar la biomasa disponible para el siguiente año.
    Description: The biomass of the pink shrimp Farfantepenaeus notialis present in Ana María gulf during the period 1997-2010, was determined by means of statistical analysis of capture for ages (SCA). The biomass was increased from the year 2008 due to the increase of the recruitment, which shows its biggest average annual values in July, November and March. The recruitspre-adults arrival to the fishing area occurs by two main zones, in front of Ana María keys, and in Sta. Cruz Abajo, at North of the South portion of the Doce Leguas keys. A fishery at the end of the year may provoke an over fishing of the growth and to affect the available biomass for the following year.
    Description: Published
    Description: pre-adults, pink shrimp, Cuba
    Keywords: Biomass ; Recruitment ; Shrimp fisheries
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 4
    Publication Date: 2021-05-19
    Description: Se determinó la biomasa del camarón rosado Farfantepenaeus notialis presente en el golfo de Ana María durante el periodo 1997-2010 mediante análisis estadístico de captura por edades (SCA). Esta se incrementó a partir del año 2008 como respuesta al aumento del reclutamiento, cuyo promedio anual presenta sus mayores valores durante el segundo semestre del año. La entrada de reclutas (pre-adultos) al área de pesca ocurre por dos zonas principales, frente a los cayos de Ana María, y en Sta. Cruz Abajo, al norte de la porción sur de los cayos de las Doce Leguas. Una pesquería a finales del año puede provocar una sobrepesca del crecimiento y afectar la biomasa disponible para el siguiente año.
    Description: It was determined the biomass of pink shrimp Farfantepenaeus notialis present in the Gulf of Ana Maria during the period 1997-2010, by means of statistical analysis of catch per ages (SCA). The biomass increased from 2008 as a response to the increment in the recruitment, which showed its highest average annual values during the second semester of that year. The input of recruits (pre-adults) to the fishing area occurs by two main zones, in front of Ana Maria keys and in Santa Cruz Abajo, North of the southern portion of Doce Leguas keys. Fishing at the end of the year may cause an overfishing of the growth, thus affecting the available biomass for the following year.
    Description: Published
    Keywords: Biomasa ; Reclutamiento ; Pre-adultos ; Camarón rosado ; Cuba ; Biomass ; Recruitment ; Pre-adults ; Pink shrimp
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.77-89
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  • 5
    Publication Date: 2021-11-22
    Description: Con el propósito de conocer el nivel de biomasa del camarón rosado (Farfantepenaeus notialis) y la variación espacio temporal de la población en la zona de pesca de la Empresa Pesquera de Granma, se analizó la información de los cruceros de prospección mensuales realizados durante los años 2009, 2010 y enero del 2011. La composición por talla muestra medias de 8.7 y 8.5 cm (largo cubano) con tallas máximas de 14.7 y 15.2 cm. En el golfo de Guacanayabo el desove de la especie ocurre durante los meses de marzo a julio. El reclutamiento muestra dos etapas, la primera en enero-febrero y la segunda en agostoseptiembre pudiendo ocurrir adelanto en los meses como se apreció en julio del año 2009. El reclutamiento se manifiesta en la zona oriental del golfo de Guacanayabo desde la Boca del Cauto hasta la ensenada de Gua, incluyendo los cayos de Manzanillo, pudiendo desplazarse al W de la ensenada de Gua. El golfo de Guacanayabo muestra una biomasa del orden de 600 t y los máximos de biomasa durante 2009, 2010 y 2011 se presentan en la Zona III en febrero, abril y enero respectivamente. La biomasa disminuye en la medida en que actúa fundamentalmente la mortalidad natural.
    Description: Aimed to know the biomass level of pink shrimp (Farfantepenaeus notialis) and the space-time variation of the population in the fishing area of EPIGRAN enterprise, the information of monthly research cruises was analyzed during years 2009, 2010 and 2011 (January). Size composition shows a mean size of 8.7 and 8.5 cm (Cuban length) with maximum sizes of 14.7 and 15.2 in 2009 and 2010 respectively. Taking into account the maxima values of gonadal maturation for areas, the Guacanayabo gulf shows that spawning takes place during the months of March to July. The recruitment confirm two stages during the year, the first one during January-February and the second during August-September, being noted that a recruitment advance may occur as observed in July, 2009. During the studied years, recruitment is mainly observed in the eastern area of Guacanayabo gulf, from the Boca del Cauto until Gua bay, including the Manzanillo keys, and may move to the west of Gua bay. Gulf of Guacanayabo shows a biomass in the order of 600 t, with maxima values during 2009, 2010 and 2011 occurring in the Zone III in February, April and January respectively. A biomass decrease is observed later due mainly as natural mortality takes place.
    Description: Published
    Description: Refereed
    Keywords: Farfantepanaeus notialis ; Maduración gonadal ; Reclutamiento ; Biomasa ; Gonadal maturation ; Recruitment ; Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.33-46
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