G. Johnsen

Publications170
h-index44
Citations6,210
Highly Influential Citations413
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THE SIGNIFICANCE OF INTRACELLULAR SELF‐SHADING ON THE BIOOPTICAL PROPERTIES OF BROWN, RED, AND GREEN MACROALGAE 1
TLDR
Thylakoid micelle preparations offer opportunities to examine more closely species‐specific differences in the packaging effect, light harvesting and utilization, and pigmentation, and may provide insight into components of the photosynthetic machinery that are specific to different classes of mncroalgne.
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Phytoplankton pigments : characterization, chemotaxonomy and applications in oceanography
TLDR
The importance of a quality assurance plan for method validation and minimizing uncertainties in the HPLC analysis of phytoplankton pigments is highlighted, as well as a proven simultaneous equation assay for chlorophylls a and b using aqueous acetone and similar assays for recalcitrant algae.
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Biooptical characteristics of PSII and PSI in 33 species (13 pigment groups) of marine phytoplankton, and the relevance for pulse‐amplitude‐modulated and fast‐repetition‐rate fluorometry 1
We studied the variability of in vivo absorption coefficients and PSII‐scaled fluorescence excitation (fl‐ex) spectra of high light (HL) and low light (LL) acclimated cultures of 33 phytoplankton…
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Ocean temperature oscillations enable reappearance of blue mussels Mytilus edulis in Svalbard after a 1000 year absence
We report the first observations of settled blue mussels Mytilus edulis L. in the high Arctic Archipelago of Svalbard for the first time since the Viking Age. A scattered population was discovered at…
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An Integrated Analysis of Molecular Acclimation to High Light in the Marine Diatom Phaeodactylum tricornutum
TLDR
The integrated results indicate that P. tricornutum is capable of swift and efficient execution of photoprotective mechanisms, followed by changes in the composition of the photosynthetic machinery that enable the diatoms to utilize the excess energy available in HL.
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Detection of harmful algal blooms using photopigments and absorption signatures: A case study of the Florida red tide dinoflagellate, Gymnodinium breve
TLDR
The utility of photopigments and absorption signatures to detect and enumerate the red tide dinoflagellate, Gymnodinium breve, was evaluated in laboratory cultures and in natural assemblages and difficulty in distinguishing among spectra can be minimized by using the similarity algorithm in conjunction with fourth-derivative analysis.
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Actinomycetes from Sediments in the Trondheim Fjord, Norway: Diversity and Biological Activity
TLDR
It is suggested that actinomycetes from marine sediments in Norwegian fjords can be potential sources for the discovery of novel anti-infective agents and strong antibiotic-producing potential among them.
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Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ice
TLDR
Phytoplankton blooms beneath snow-covered ice might become more common and widespread in the future Arctic Ocean with frequent lead formation due to thinner and more dynamic sea ice despite projected increases in high-Arctic snowfall.
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Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea
TLDR
The chromoprotein model provided accurate spectral estimates of in vivo absorption coefficents and worked equally well for dinoflagellate species with or without the major light-harvesting peridinin-chlorophyll-protein complex, PCP.
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Pigments and photoacclimation processes
TLDR
The nature of pigment variations in phytoplankton in response to changes in light regime (irradiance, spectral composition and daylength) is reviewed and the ecophysiological variability of XC and its use as a biological tracer in oceanographic studies is reported.
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