Saturated and unsaturated sterols of nitrogen-fixing blue-green algae (cyanobacteria)
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2023, Bacterial Secondary Metabolites: Synthesis and Applications in AgroecosystemC<inf>30</inf> and C<inf>31</inf> steranes in Permian fossil conifers Protophyllocladoxylon
2022, Applied GeochemistryCitation Excerpt :steranes in all the conifer trunk samples indicate that the source of extracted hydrocarbons from trunk samples is probably eukaryotic rather than prokaryotic. However, a prokaryotic origin of the C30 4-methylsteranes still cannot be excluded, such as a fresh-water cyanobacteria (Kohlhase and Pohl, 1988) or bacterium Methylococcus capsulatus grown on methane (Bird et al., 1971) or other unknown species, although some of the sterols they produced do not have alkyl groups at C-24. Kimble et al., (1974) also reported 4-methylsteranes in the Messel oil shale deposited in shallow swampy lakes during the Eocene, and suggested either a bacterial origin of 4-methylsterols or a diagenetic pathway of 4-methylsterols.
Phytosterol-rich compressed fluids extracts from Phormidium autumnale cyanobacteria with neuroprotective potential
2021, Algal ResearchCitation Excerpt :For this, higher pressures were also chosen to enable triterpenoid structure solubilization. Imbimbo et al. [50] reported a working pressure of 350 bar for bioactive intracellular metabolite extraction from Galdieria phlegre cyanobacteria, while for Arthrospira platensis and Arthrospira maxima, pressures of 300 and 350 bar were required [51,52]. Individual responses corresponding to target major sterols in the P. autumnale biomass (STIGMA, SITO, and CHO) were evaluated.
Microalgae: A potential sustainable commercial source of sterols
2020, Algal ResearchAssessment of the antimicrobial activity of the lipoidal and pigment extracts of Punica granatum L. leaves
2019, Acta Ecologica SinicaCitation Excerpt :Mass spectrum gave M+ at m/z 396 for molecular formula C28H44O and 377, 379 for [M–H3O] + and [M−HO] + fragment ions, 363 for [C27H39]+ ion which is also very distinctive for ergosterol, 299.24 was consistent with the mass of a [C21H31O]+ ion, 269 and 271 as a result of breaking of the C-17/C-20 bond. The isolated compound was compared with an authentic reference and the spectral data was confirmed with the previously published data [24]. Compound 3: α-tocopherol was obtained as oily residue, yielding 20 mg.
Physiological effects of mercury in the lichens Cladonia arbuscula subsp. mitis (Sandst.) Ruoss and Peltigera rufescens (Weiss) Humb
2011, ChemosphereCitation Excerpt :Therefore different ergosterol content in the two lichen species may not reflect a differential sensitivity of the mycobionts, but more likely their different composition. In fact, ergosterol is present also in some unicellular algae and cyanobacteria and higher ergosterol levels have been found in lichens which have nitrogen-fixing photobionts (Kohlhase and Pohl, 1988). In both C. arbuscula subsp. mitis and P. rufescens we found increasing Hg accumulation under increasing Hg supply in the treatment solutions.