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@PHDTHESIS{Braun:150270,
author = {Braun, Regina},
title = {{P}henotyping {N}annochloropsis gaditana under different
conditions in controlle photobioreactor in laboratory and
upscaled photobioreactors in greenhouse},
volume = {221},
school = {Universität Düsseldorf},
type = {Dissertation},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2014-00344},
isbn = {978-3-89336-975-1},
series = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
Umwelt / Energy $\&$ Environment},
pages = {177 S.},
year = {2013},
note = {Online-Publikation; Dissertation, Universität Düsseldorf,
2013},
abstract = {Since resources of fossil fuels are limited, alternatives
for energy production need to be explored. Besides plants as
biomass and energy crops, the interest in microalgaehas been
increasing, as they can synthesize many valuable compounds
with a large application range, including transport fuels or
fish and animal feed, without competing with agricultural
food production for arable land. Moreover, microalgae can
utilize ue gas from industrial emissions and municipal
wastewater as a nutrient source. For economically viable
production of algae, however, it is necessary to explore the
maximal potential of algae by optimized cultivation
conditions and targeted genetic modifications based on the
knowledge about their physiology as well as regulatory
mechanisms of growth and metabolic processes, in addition to
technical improvement of photobioreactors (PBRs) and
downstream processes. Circadian clocks synchronize certain
physiological, metabolic and developmental processes of
organisms with specific phases of recurring changes in their
environment, e.g. day and night or seasons. In this study it
was investigated whether the circadian clock plays a role in
regulation of growth and chlorophyll accumulation in
$\textit{Nannochloropsis gaditana}$, an oleaginous marine
microalga that is considered as a potential feedstock for
biofuels and for which a draft genome sequence has been
published. Optical density (OD) of $\textit{N. gadinata}$
culture was monitored at 680 and 735 nm under 12 h/12 h or
18 h/6 h light-dark (LD) cycles and after switching to
continuous illumination (LL) in controlled PBRs in the
laboratory. In parallel, chlorophyll fluorescence was
measured to assess the quantum yield of photosystem (PS) II.
Furthermore, to test if red- or blue-light photoreceptors
are involved in clock entrainment in $\textit{N. gaditana}$,
some of the experiments were conducted by using only red or
blue light. Growth and chlorophyll accumulation were
confined to light periods in the LD cycles, increasing more
strongly in the first half than in the second half of the
light periods. After switching to continuous light, rhythmic
oscillations persisted (especially for OD$_{680}$) at least
in the first 24 h, with a 50\% [...]},
keywords = {Dissertation (GND)},
cin = {IBG-2},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {242 - Sustainable Bioproduction (POF2-242)},
pid = {G:(DE-HGF)POF2-242},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/150270},
}