202 research outputs found
Einfluß von Trockenstreß auf die Photosyntheseaktivität verschiedener Ökotypen der Buche (Fagus sylvatica L.). Projekt Europäisches Forschungszentrum für Maßnahmen zur Luftreinhaltung (PEF). Zwischenbericht anlässlich des Statusseminars der Projektträger des Landes Baden-Württemberg am 3. und 4. März 1998 im Forschungszentrum Karlsruhe. Förderkennzeichen: PEF 197002
Pink‐ and orange‐pigmented Planctomycetes produce saproxanthin‐type carotenoids including a rare C45 carotenoid
Planctomycetes, are ubiquitous and environmentally important Gram-negative aquatic bacteria with key roles in global carbon and nitrogen cycles. Many planctomycetal species have a pink or orange colour and have been suggested to produce carotenoids. Potential applications as food colorants or anti-oxidants have been proposed. Hitherto, the planctomycetal metabolism is largely unexplored and the strain pigmentation has not been identified. For a holistic view on the complex planctomycetal physiology we analyzed carotenoid profiles of the pink-pigmented strain Rhodopirellula rubra LF2T and of the orange strain Rubinisphaera brasiliensis Gr7. During LC-MS/MS analysis of culture extracts we were able to identify three saproxanthin-type carotenoids including a rare C45 carotenoid. These compounds, saproxanthin, dehydroflexixanthin and 2’-isopentenyldehydrosaproxanthin, derive from the common carotenoid precursor lycopene and are characterized by related end groups, namely a 3-hydroxylated β-carotene-like cyclohexene ring as one end group and simple hydration on the other end of the molecule. Based on the observed molecule structure we present putative pathways for their biosynthesis. Results support Planctomycetes as a promising, yet mostly untapped source of carotenoids
A rotação de cultura reduz a matocompetição e aumenta o teor de clorofila e a produtividade do arroz
Capacidade fotossintética de plantas de algodoeiro infectadas por ramulose e supridas com silício
Remediation of salt-affected soil by the addition of organic matter: an investigation into improving glutinous rice productivity
Diodos emissores de luz e concentrações de BAP na multiplicação in vitro de morangueiro
Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil
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