López Jiménez, José Ángel

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López Jiménez, José Ángel

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López Jiménez, José Ángel

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Universidad de Murcia. Departamento de Fisiología

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Open Access
Influence of aquaculture waste on fatty acid profiles and gonad maturation of wild fish aggregations at fish farms
(Elsevier, 2020-02-05) Izquierdo Gómez, David; Sánchez Pérez, Pablo; González Silvera, Daniel; López Jiménez, José Ángel; Martínez López, Francisco Javier; Elbal Leante, María Teresa; Fisiología; Facultades de la UMU::Facultad de Biología
Wild fish belonging to four species belonging to different trophic groups were captured at three distances from fish farm facilities: long distance (>5 Km), medium distance (1.5 Km) and close to sea-cages. Flesh, brain, liver and gonads were sampled for fatty acid analysis. Fish aggregated near sea-cages showed accumulation of fatty acids of vegetable origin in the studied tissues, due to surplus feed consumption or via predation of fish that consumed the feed. Gonads accumulated vegetable fatty acids in different manner in the different species, and the species least and most influenced by fish-feeds were selected for gonad histological examination. Results showed an acceleration of the final stages of the oocyte development in fish aggregated near fish farms compared to fish captured at long distance. Differences in oocyte development were more acute in the species which incorporated higher quantities of vegetable fatty acids.
Open Access
Fatty acids profile of Mastigocladus laminosus Cohn ex Kichner isolated from Algerian hot springs as a biofuel feedstock
(Elsevier, 2022-05-15) Senoussi, Mohammed Mourad; González Silvera, Daniel; Boutarfa, Soumia; López Jiménez, José Ángel; Aboal Sanjurjo, Marina; Fisiología; Facultades de la UMU::Facultad de Biología
Cyanobacterial lipids are considered the feedstock of future sustainable biodiesel production, and extremophiles are usually preferred for biotechnological purposes to ease the cultivation problems. However, thermal springs have been scarcely investigated from a biotechnological perspective. Three strains of Mastigocladus laminosus Cohn ex Kichner were isolated from hot springs in Algeria, and their fatty acid profiles were studied. The content of saturated fatty acids ranged from 55.91% to 59.37%, while monounsaturated fatty acids and polyunsaturated fatty acids ranged from 38.39% to 43.54% and 0.57%–2.25%, respectively. The main fatty acid was palmitic acid (16:0), with values within the 51.41–53.16% range, followed by oleic acid (18:1n-9) with 24.47–36.60%, and minimal quantities of α-linolenic acid (18:3n-3, below 1%) and longchain fatty acids (>C18, below 0.5%). The potential biodiesel fuel properties matched the European biodiesel standards EN 14214 (European Norms) and the American standard ASTM D6751 (American Society for Testing and Materials), and were relatively better than other studied cyanobacteria and vegetable oils. The presented data show the interest of Mastigocladus and probably other thermophilic strains in different biotechnology fields, especially biofuel production.
Open Access
Daily rhythms in the morphometric parameters of hepatocytes and intestine of the European sea bass (Dicentrarchus labrax): influence of feeding time and hepatic zonation
(Springer, 2020-12-06) Betancor, Mónica B.; Rodríguez, Inmaculada; López Jiménez, José Ángel; Esteban Abad, María de los Ángeles; Sánchez Vázquez, Francisco Javier; López Olmeda, José Fernando; Fisiología; Facultades de la UMU::Facultad de Biología
The digestive system presents daily rhythms at both physiological and histological levels. Although cell morphology rhythms in mammals have been reported, they have scarcely been investigated in fish. The aim of the present research was to investigate the existence of daily rhythms in the morphology of cells in the liver and intestine of a teleost fish, the European sea bass (Dicentrarchus labrax), and how feeding time influences them. Regarding liver, we also focused on differences between the two metabolic zones: perivenous and periportal. For this purpose, fish were divided into two groups: fish fed once a day in the mid-light phase (ML) or the mid-dark phase (MD). After 1 month under each feeding regime, liver and intestine samples were collected every 4 h during a 24-h cycle, and different parameters were studied by light microscopy and image analysis. Daily rhythms occurred in most of the parameters evaluated in the liver. The effect of feeding time depended on the metabolic zone: the rhythms in the periportal zone were synchronized mainly by the light/dark cycle regardless of feeding time, whereas in the perivenous zone, rhythms were influenced more by feeding time. In the intestine, a daily rhythm in villi height was found with acrophases coinciding with feeding time in each group. These findings show for the first time the existence of cellular morphological rhythms in fish liver and intestine, and highlight the interactions between light and feeding cycles in the different metabolic zones of the liver.
Open Access
The green microalga Coelastrella thermophila var. globulina (Scenedesmaceae, Chlorophyta) isolated from an Algerian hot spring as a potential source of fatty acids
(MDPI, 2022-04-08) Senoussi, Mohammed Mourad; González Silvera, Daniel; Boutarfa, Soumia; López Jiménez, José Ángel; Aboal Sanjurjo, Marina; Fisiología; Facultades de la UMU::Facultad de Biología
Screening microalgae from extreme environments, including hot springs, is an important research topic that has lately emerged. A thermophilic green alga was isolated from a north-eastern Algerian hot spring at a temperature of 63 °C, and its fatty acid (FA) profile was explored. The strain was cultivated in BBM medium at 35 °C in a 16:8 h light/dark cycle and 75 μM photons m−2 s−1. The morphological studies combined with phylogenetic analysis revealed that the isolate was Coelastrella thermophila var. globulina Q. Wang, H. Song, X. Liu, G. Liu and Z. Hu. The monounsaturated fatty acid (MUFA) content was 51.12%. The saturated fatty acid (SFA) and polyunsaturated fatty acid (PUFA) content, respectively, accounted for 27.01% and 21.87%. The main FA was oleic acid (18:1n–9), whose value was 35.95%, followed in decreasing order by palmitic acid (16:0) with 21.45%, linoleic acid (18:2n–6) with 14.38% and α-linolenic acid (18:3n–3) with 04.22%. The FA profile exhibited high total n–6 and n–3 PUFA values (15.80% and 5.76%, respectively). Coelastrella thermophila var. globulina is particularly interesting for producing n-6 and n-3 PUFA and is likely suitable for other biotechnological purposes. This is the first time that this taxon has been reported in hot springs. Other species can be expected to be reported, which emphasises the importance of the biodiversity of extreme habitats.
Open Access
Chitosan induces salicylic acid and methyl salicylate in banana plants and reduces colonisation by Fusarium oxysporum f. sp. cubense TR4
(Elsevier, 2025-02-06) Lopez Moya, Federico; Zorrilla Fontanesi, Yasmín; Lozano Soria, Ana; Ganado, Nadia Fernández de Larrinoa; Moreno González, Celia Mei; Hernández, Arnau; Torres, Ariadna; González Silvera, Daniel; Benet, Gunsé; López Jiménez, José Ángel; Lopez Llorca, Luis V.; Fisiología
Banana (Musa spp.) cultivation is essential for food security; however, the clonality of commonly used forms renders them highly susceptible to pests and diseases. The wilt fungus Fusarium oxysporum f. sp. cubense Tropical Race 4 (FocTR4) threatens banana production worldwide. Chitosan induces salicylic acid (SA) and methyl salicylate (MeSA) production in banana plants and reduces colonisation by FocTR4. This polymer induces the main SA biosynthetic pathway mediated by isochorismate synthase 1 and phenylalanine ammonia-lyase. Chitosan also induces systemic acquired resistance genes, mainly flavin-dependent monooxygenase 1 (FMO1), in banana roots. The banana genotypes Petit Naine, Gros Michel, Enzirabahima, Yangambi Km5, and Foconah differ in their response to chitosan. In the Foc-resistant Yangambi Km5, chitosan induced an approximately 7-fold increase in FMO1. Preventive chitosan treatments together with the endophytic biocontrol fungus Pochonia chlamydosporia strain 123 reduced colonisation of banana roots by FocTR4 (approximately 4-fold). Therefore, chitosan and beneficial endophytes can help sustainably manage FocTR4 infection in bananas. We propose a novel method to induce local and systemic defences for biomanagement of banana pests and diseases.