Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2019
Forfattere
CKM Tsui S Beauseigle Dario Isidro Ojeda Alayon AV Rice JEK Cooke FAH Sperling AD Roe RC HamelinSammendrag
Det er ikke registrert sammendrag
Forfattere
Mariosimone Zoccali Daniele Giuffrida Fabio Salafia Carmen Socaciu Kari Skjånes Paola Dugo Luigi MondelloSammendrag
Both enzymatic or oxidative carotenoids cleavages can often occur in nature and produce a wide range of bioactive apocarotenoids. Considering that no detailed information is available in the literature regarding the occurrence of apocarotenoids in microalgae species, the aim of this study was to study the extraction and characterization of apocarotenoids in four different microalgae strains: Chlamydomonas sp. CCMP 2294, Tetraselmis chuii SAG 8-6, Nannochloropsis gaditana CCMP 526, and Chlorella sorokiniana NIVA-CHL 176. This was done for the first time using an online method coupling supercritical fluid extraction and supercritical fluid chromatography tandem mass spectrometry. A total of 29 different apocarotenoids, including various apocarotenoid fatty acid esters, were detected: apo-12’-zeaxanthinal, β-apo-12’-carotenal, apo-12-luteinal, and apo-12’-violaxanthal. These were detected in all the investigated strains together with the two apocarotenoid esters, apo-10’-zeaxanthinal-C4:0 and apo-8’-zeaxanthinal-C8:0. The overall extraction and detection time for the apocarotenoids was less than 10 min, including apocarotenoids esters, with an overall analysis time of less than 20 min. Moreover, preliminary quantitative data showed that the β-apo-8’-carotenal content was around 0.8% and 2.4% of the parent carotenoid, in the C. sorokiniana and T. chuii strains, respectively. This methodology could be applied as a selective and efficient method for the apocarotenoids detection.
Forfattere
Abdelhameed ElameenSammendrag
Det er ikke registrert sammendrag
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Sammendrag
Fisk er en viktig parameter når man skal vurdere økologisk tilstand i forhold til vannforskriften. Romeriksåsene er et område som har vært benyttet i flere 100 år og hvor mennesker har satt spor etter seg. 17 lokaliteter og 20 potensielle vandringshindre ble derfor vurdert i 2017 og 2018 med hensyn til fisketetthet, fragmenteringsgrad og barriereeffekt. Totalt viste 13 objekter seg å være vandringshindre for fisk, og trenger utbedring for å oppnå minst god økologisk tilstand.
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Sammendrag
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Sammendrag
Innslag på Distriktsnyheter Østnytt, 19.august 2019, kl. 18:50
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Peter Simon Claus Schulze Celeste Brindley José M. Fernández Ralf Rautenberger Hugo Pereira Rene Hubertus Wijffels Viswanath KironSammendrag
Light attenuation in photobioreactors is a major bottleneck in microalgal production. A possible strategy for artificial light-based microalgal production to deliver light deep inside the culture is through the periodical emission of high intensity light flashes (so-called flashing light). However, our results did not show improved photosynthetic rates compared to continuous light for dilute and concentrated Tetraselmis chui cultures exposed to flashing light with various repetition rates (frequencies 0.01 Hz–1 MHz), light-dark ratios (duty cycles: 0.001–0.7) or time-averaged light intensity (50–1000 μmol s−1 m−2). Likewise, flashing light applied to Chlorella stigmatophora and T. chui batch cultures could not enhance growth. However, we observed flashing light effects at different duty cycles and frequencies, depending on cell acclimation, culture concentration, and light intensity. In conclusion, artificial flashing light does not improve microalgal biomass productivities in photobioreactors, but low frequencies (f < 50 Hz) may be still used to improve light harvesting-associated biomolecules production.