Search results for "CAROTENOID"
showing 10 items of 249 documents
Carotenoid-based colour of acanthocephalan cystacanths plays no role in host manipulation.
2009
Manipulation by parasites is a catchy concept that has been applied to a large range of phenotypic alterations brought about by parasites in their hosts. It has, for instance, been suggested that the carotenoid-based colour of acanthocephalan cystacanths is adaptive through increasing the conspicuousness of infected intermediate hosts and, hence, their vulnerability to appropriate final hosts such as fish predators. We revisited the evidence in favour of adaptive coloration of acanthocephalan parasites in relation to increased trophic transmission using the crustacean amphipodGammarus pulexand two species of acanthocephalans,Pomphorhynchus laevisandPolymorphus minutus. Both species show car…
Effect of growing area on tocopherols, carotenoids and fatty acid composition ofPistacia lentiscusedible oil
2014
International audience; In this investigation, we aim to study, for the first time, the effect of the growing area on tocopherols, carotenoids and fatty acid content of Pistacia lentiscus fixed oil. Fruits were harvested from eight different sites located in the north and the centre of Tunisia. Tocopherols, carotenoids and fatty acid content of the fixed oils were determined. The highest carotenoid content was exhibited by Feija oil (10.57 mg/kg of oil). Oueslatia and Tabarka oils displayed the highest alpha-tocopherol content (96.79 and 92.79 mg/kg of oil, respectively). Three major fatty acids were determined: oleic, palmitic and linoleic acids. Oleic acid was the main fatty acid presenti…
Epistatic interactions between pterin and carotenoid genes modulate intra-morph color variation in a lizard.
2021
Color polymorphisms have become a major topic in evolutionary biology and substantial efforts have been devoted to the understanding of the mechanisms responsible for originating such colorful systems. Within-morph continuous variation, on the other hand, has been neglected in most of the studies. Here, we combine spectrophotometric/visual modeling and genetic data to study the mechanisms promoting continuous variation within categorical color morphs of Podarcis muralis. Our results suggest that intra-morph variability in the pterin-based orange morph is greater compared to white and yellow morphs. We also show that continuous variation within the orange morph is partially discriminable by …
Tunisian tomato by-products, as a potential source of natural bioactive compounds.
2016
Consumption of tomato and tomato products is positively related to the reduction in cardiovascular disease and several types of cancer, thanks to the presence of natural compounds, such as antioxidants. Peels and seeds fractions of tomato, collected after industrial processing in Tunisian industries, were analysed for nutritional and antioxidants composition in perspective of its utilisation. Proximate composition, fatty acids profile, carotenoids, such as lycopene and beta-carotene, polyphenols contents, demonstrated the good potential of these residual products as a source of natural compounds, useful for food and nutraceuticals applications.
Physicochemical, Nutraceutical and Sensory Traits of Six Papaya (Carica papaya L.) Cultivars Grown in Greenhouse Conditions in the Mediterranean Clim…
2020
Six papaya (Carica papaya L.) cultivars, grown in a Mediterranean climate under greenhouse conditions, were screened for physicochemical properties, antioxidant capacity, nutritional and sensory characteristics. The fruits, harvested with more than 50% of yellow surface (between 60% and 77%) were tested for carotenoids content, phenolic content, reducing activity (ABTS) and cellular antioxidant activity (CAA50). The physicochemical traits were measured in terms of the titratable acidity and soluble content whereas proximal composition along with moisture, fats, total sugar, ash, vitamin A, C and E content. Moreover, the sensory profile was analyzed by a semi-trained panel. Although the six …
Mixotrophy in a Local Strain of Nannochloropsis granulata for Renewable High-Value Biomass Production on the West Coast of Sweden
2022
A local strain of Nannochloropsis granulata (Ng) has been reported as the most productive microalgal strain in terms of both biomass yield and lipid content when cultivated in photobioreactors that simulate the light and temperature conditions during the summer on the west coast of Sweden. To further increase the biomass and the biotechnological potential of this strain in these conditions, mixotrophic growth (i.e., the simultaneous use of photosynthesis and respiration) with glycerol as an external carbon source was investigated in this study and compared with phototrophic growth that made use of air enriched with 1–2% CO2. The addition of either glycerol or CO2-enriched air stimulated the…
Regulatory changes in pterin and carotenoid genes underlie balanced color polymorphisms in the wall lizard
2019
Significance Reptiles show an amazing color diversity based on variation in melanins, carotenoids, and pterins. This study reveals genes controlling differences between three color morphs (white, orange, and yellow) in the common wall lizard. Orange pigmentation, due to high levels of orange/red pterins in skin, is caused by genetic changes in the sepiapterin reductase gene. Yellow skin, showing high levels of yellow carotenoids, is controlled by the beta-carotene oxygenase 2 locus. Thus, the color polymorphism in the common wall lizard is associated with changes in two small regions of the genome containing genes with crucial roles in pterin and carotenoid metabolism. These genes are likel…
Carotenoides y tocoferoles en frutos cítricos: implicación en la tolerancia a los daños por frío durante la conservación refrigerada
2021
El objetivo principal de esta Tesis Doctoral fue profundizar en la implicación de compuestos antioxidantes en la sensibilidad al DF durante la conservación refrigerada de frutos cítricos. Para ello, en primer lugar, se estudió el papel de los carotenoides y la vitaminaC, y su relación con la capacidad antioxidante, en la diferente sensibilidad al DF de frutos de variedades de mandarina. En segundo lugar, se analizó el papel de los tocoferoles en la tolerancia natural al DF en frutos de mandarina, y en la tolerancia inducida en pomelo mediante el tapado de frutos. Además, se evaluó el efecto del frío y la ausencia de luz sobre la expresión de los genes de la ruta de biosíntesis de tocoferole…
Biosíntesis y acumulación de carotenoides en frutos cítricos y su implicación en la calidad postcosecha
2015
La conservación refrigerada es una de las tecnologías más utilizadas para preservar la calidad postcosecha de frutas y hortalizas. Los cítricos son el principal frutal que se produce en el mundo y el transporte refrigerado es esencial para conservar la calidad y cumplir con los requisitos de los mercados. Sin embargo, los cítricos presentan una alta sensibilidad a las bajas temperaturas. Los frutos de pomelos se encuentran entre los cítricos más sensibles al frío y desarrollan manchados en la piel conocidos como daño por frío (DF), a temperaturas por debajo de 8-10 ºC. Estas alteraciones no afectan a la calidad interna del fruto, pero deprecian de forma importante su valor comercial. Por el…
Life under the sun: microbial ecology and applications of the solar panel microbiota
2021
El mundo procariota es vasto y diverso, y aún queda una gran fracción por explorar. La diversidad microbiana es el resultado de la evolución y la adaptación. Esta diversidad nos proporciona un increíble arsenal de herramientas únicas y útiles que se pueden utilizar en una amplia gama de aplicaciones industriales y farmacéuticas. La búsqueda de estas herramientas biológicas es lo que conocemos como bioprospección y, teniendo en cuenta que hasta la fecha sólo se ha explorado una fracción de la diversidad microbiana global, el número de cepas, herramientas genéticas o metabolitos con aplicaciones en biotecnología o en biomedicina que aún quedan por descubrir es abrumador. Esto abre una gran op…