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Sökning: WFRF:(Huerta Jose M.)

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101.
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102.
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103.
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105.
  • Van Nieuwerburgh, Lies, 1973- (författare)
  • Experimental Studies on the Regulation of Pigment Dynamics in Phytoplankton and Copepods by Dissolved Inorganic Nutrients
  • 2004
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • This thesis examines the role of dissolved inorganic nutrients in generating changes in phytoplankton community and pigment composition and if such changes can affect the production of the antioxidant astaxanthin in the ecosystem via pelagic copepods. The background of my studies is the possible relationship between eutrophication and a reproductive disturbance in Baltic populations of Atlantic salmon (M74), which is associated with astaxanthin and thiamine deficiencies and oxidative stress. In the southern Baltic Sea, changes in nutrient loads correlate with observed trends of flagellates replacing diatoms in the phytoplankton. Copepods are the main producers of astaxanthin and a major link between phytoplankton and higher trophic levels. In laboratory and field experiments in the Baltic Sea proper and the Norwegian Sea, I show that astaxanthin synthesis in copepods is fast and depends on pigment composition of the phytoplankton diet. Among single-species diets, a diatom and a green algal cyst yielded the highest astaxanthin levels in copepods, and another diatom species, a green alga and a cyanobacterium the lowest. In nutrient-generated phytoplankton blooms in mesocosms, copepods grazing on diverse communities dominated by weakly silicified diatoms produced more astaxanthin compared with copepods grazing on communities dominated by strongly silicified diatoms. This suggests that diatoms invested in defence mechanisms and escaped grazing at surplus Si. A nutrient-starved diatom culture subjected to intraspecific competition exhibited decreased pigment levels, increased thiamine levels and increased oxidative stress.My results suggest that diatoms are beneficial for astaxanthin and thiamine production compared to other phytoplankton groups, but not under all circumstances. Copepod growth and development also responded to inorganic nutrient availability and affected total astaxanthin production per volume seawater, with highest production when the copepods grazed on diatoms. From an ecosystem perspective, increased N and P loads seem to promote high astaxanthin production, but not when diatoms disappear completely.
106.
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107.
  • Zalubovskis, Raivis, et al. (författare)
  • Iridium-catalyzed asymmetric hydrogenation of olefins using pyridine-phosphinites derived from the chiral pool
  • 2008
  • Ingår i: ARKIVOC. - 1424-6376. ; s. 58-66
  • Tidskriftsartikel (refereegranskat)abstract
    • Cationic iridium complexes containing chiral pyridine-phosphinites, with their chirality derived from menthol or mandelic acid, were assessed in hydrogenations of trisubstituted non-functionalized olefins. Complexes with the new ligands showed high reactivity towards most of the olefins tested. The enantioselectivities varied with the structures of the substrate and the ligand. Best results were obtained in the hydrogenation of 3-hydroxy-2-methyl-1-phenylpropene using a ligand prepared from (-)-menthol, pyridyllithium and diphenylchlorophosphine (>99% conversion, 92% ee).
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108.
  • Zaluma, Astra, et al. (författare)
  • Growth rates of Heterobasidion annosum s.s. and H.parviporum in functional sapwood of Pinus sylvestris and Picea abies
  • 2015
  • Ingår i: Forest Pathology. - 1437-4781 .- 1439-0329. ; 45:5, s. 437-439
  • Tidskriftsartikel (refereegranskat)abstract
    • Growth rates of H.annosum s.s. and H.parviporum were investigated in the functional sapwood of young Pinus sylvestris and Picea abies plants as an indicator of the relative susceptibilities of the hosts to these pathogens. The stems of 520 five-year-old P.abies and 321 four-year-old P.sylvestris plants were inoculated and the extent of infection determined 16weeks later. H.annosum s.s.grew further than H.parviporum in P.sylvestris sapwood, while in P.abies, no differences between the two Heterobasidion spp. were found. Both H.annosum s.s. and H.parviporum spread faster in the sapwood of P.abies than in P.sylvestris. There was high within-host species variation in growth rates for both P.sylvestris and P.abies suggesting it may be possible to identify tree genotypes with lower susceptibility.
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