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Eriksen, Niels Thomas; Poulsen, Bjarne Rask; Iversen, Jens

doi:10.1023/a:1008029521111

Cited by 30 publications

(1 citation statement)

References 17 publications

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“…This provided evidence that nanophytoplankton was a major, if not dominant, component of the phytoplankton in the study site. To verify this suggestion, we estimated a potential contribution of CP to the total Chl-a, using different conversion factors: 0.2 pg Chl-a cell −1 [52] and 1.5 pg Chl-a cell −1 [53]. In the high Chl-a spot at station 6591 (1.28 µg Chl-a L −1 ), the approximation of CP biomass in terms of Chl-a ranged from 0.31 to as high as 2.32 µg Chl-a L −1 , depending on which conversion factor is used.…”

Section: Cryptophytamentioning

confidence: 99%

Cryptophyte and Photosynthetic Picoeukaryote Abundances in the Bransfield Strait during Austral Summer

Mukhanov

Sakhon

Polukhin

et al. 2022

Water

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A remarkable shift in the species composition and size distribution of the phytoplankton community have been observed in coastal waters along the Antarctic Peninsula over the last three decades. Smaller photoautotrophs such as cryptophytes are becoming more abundant and important for the regional ecosystems. In this study, flow cytometry was used to quantify the smallest phytoplankton in the central Bransfield Strait and explore their distribution across the strait in relation to physical and chemical properties of the two major water masses: the warmer and less saline Transitional Zonal Water with Bellingshausen Sea influence (TBW), and the cold and salty Transitional Zonal Water with Weddell Sea influence (TWW). Pico- and nano-phytoplankton clusters were distinguished and enumerated in the cytograms: photosynthetic picoeukaryotes, cryptophytes (about 9 µm in size), and smaller (3 µm) nanophytoplankton. It was shown that nanophytoplankton developed higher abundances and biomasses in the warmer and less saline TBW. This biotope was characterized by a more diverse community with a pronounced dominance of Cryptophyta in terms of biomass. The results support the hypothesis that increasing melt-water input can potentially support spatial and temporal extent of cryptophytes. The replacement of large diatoms with small cryptophytes leads to a significant shift in trophic processes in favor of the consumers such as salps, which able to graze on smaller prey.

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Section: Cryptophytamentioning

confidence: 99%

Cryptophyte and Photosynthetic Picoeukaryote Abundances in the Bransfield Strait during Austral Summer

Mukhanov

Sakhon

Polukhin

et al. 2022

Water

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Membrane sparger in bubble column, airlift, and combined membrane–ring sparger bioreactors

Poulsen¹,

Iversen²

1999

Biotech & Bioengineering

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The bubble column and the two internal loop airlift reactors (riser/downcomer area ratios of 0.11 and 0.58) characterized in this study were equipped with a rubber membrane sparger, which produced small bubbles, giving high mass transfer coefficients. The low mixing intensity in the bubble column was increased by an order of magnitude in the airlift reactors. We designed a novel aeration and mixing system by adding a ring sparger to the membrane sparger in the bubble column and maintained the advantages of both airlift configuration (good mixing properties) and bubble column configuration (efficient aeration, without any internal constructions). The combined membrane–ring sparger system has unique features with respect to the efficiency of utilization of substrate gasses and energy. Model experiments showed that the small bubbles from the membrane sparger do not coalesce with the large bubbles from the ring sparger. If different gases were added through the two spargers it was possible to transfer a hazardous or expensive gas quantitatively to the liquid through the membrane sparger (dual sparging mode). In the combined membrane–ring sparger system the energy input for mixing and mass transfer is divided. Therefore, the energy consumption can be minimized if the flow distribution of air through the membrane and ring sparger is controlled by the oxygen demand and the inhomogeneity of the culture, respectively (split sparging mode). The dual sparging mode was used for mass production of the alga Rhodomonas sp. as the first step in aquatic food chains. Avoiding mechanical parts removes an important risk of malfunction, and a continuous culture could be maintained for more than 8 months. © 1999 John Wiley & Sons, Inc. Biotechnol Bioeng 64: 452–458, 1999.

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Growth in Photobioreactors

Eriksen

2013

Natural and Artificial Photosynthesis

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Cited by 30 publications

References 17 publications

Cryptophyte and Photosynthetic Picoeukaryote Abundances in the Bransfield Strait during Austral Summer

Cryptophyte and Photosynthetic Picoeukaryote Abundances in the Bransfield Strait during Austral Summer

Membrane sparger in bubble column, airlift, and combined membrane–ring sparger bioreactors

Growth in Photobioreactors

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