Pressure, O2, and CO2, in aquatic Closed Ecological Systems

Taub, Frieda B.; McLaskey, Anna K.

doi:10.1016/j.asr.2012.10.016

Cited by 11 publications

(12 citation statements)

References 15 publications

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“…The extraction of the gaseous oxygen from an aqueous culture of AMC would be a promising application in artificial life-supporting environments (Taub and McLaskey 2013), where, together with enough nutrients in the alkaline aqueous medium (pH>9), it would maintain an O 2 -enriched atmosphere (e.g., for spacecraft applications). The CO 2 produced by human respiration could be quickly absorbed under alkaline pH, where in case of efficient photosynthesis it would produce further oxygen besides the recovery of the OH − ions spent during the previous CO 2 absorption (Thiansathit et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…The produced oxygen could be employed in any other oxygen-demanding process, from traditional aerobic processes to spacecraft (Muñoz and Guieysse 2006;Taub and McLaskey 2013;Bahr et al 2014). Closed photobioreactors can be deployed to assess the photosynthetic activity of microalgae under controlled conditions, i.e., irradiance and mixing (Jacobi et al 2012), in which the oxygen may be used as an additional indicator of activity and recovered for later use (Nauman 2008).…”

Section: Introductionmentioning

confidence: 99%

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Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

et al. 2015

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A novel lab-scale tubular closed photobioreactor was developed and used for the assessment of the photosynthetic activity of an alkaliphilic microalgae mixed consortium under non-substrate limitation (i.e., bicarbonate excess), controlled irradiance, and mixing conditions. Two prominent haloalkaliphilic strains were identified as members of the consortium: Halospirulina sp. and Picochlorum sp. The photobioreactor (vol=0.5 L) consists of two interconnected U-shaped borosilicate glass tubes (internal diameter 2 cm) reaching a surface/volume ratio of 200 m 2 m −3 . This configuration specifically addressed the issue of the homogeneous light distribution among the microalgae suspended cells cultured by using fixed equidistant cool white light LEDs nearby the surface of the glass tubes. A soft homogeneous pneumatic mixing (i.e., airlift) was implemented in the culture fostering Reynolds numbers around 3000. The photosynthetic activity of the microalgae consortium was evaluated during different short-term kinetic assays by fitting the dynamics of the dissolved oxygen concentration to an oxygenic kinetic model. The photobioreactor operated in a closed loop allowed to control the produced oxygen by the extraction of the cumulated gas in the headspace. The use of this novel photobioreactor allowed the photosynthetic activity of microalgae suspended cells to be assessed, where the dissolved oxygen concentration and irradiance were the main parameters affecting the oxygenic rates under alkaline pH.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

et al. 2015

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“…Medium: Four experiments were conducted with different nominal concentrations (in mM) of C:N:P. In Experiments 1 and 2, C 3.3, N 0.125, P 0.01, and in Experiments 3 and 4, C 13.2, N 0.031, P 0.0025 initially, with N and P increased to N 0.5, P 0.04 on day 41 (Experiment 3) and day 48 (Experiment 4). The base medium was the same in all experiments, having the concentrations of B/4 (Taub and Mclaskey 2013); see also Table S1. In general, concentrations of ions are varied by factors of 4.…”

Section: Methodsmentioning

confidence: 99%

“…Monitoring: Temperature, pressure, O2, pH, and conductivity were recorded each 5 minutes by a sonde (Manta2, Eureka Water Probes) inserted into a sealed culture container; the unit was mounted on a rotary shaker at 100-110 RPM. Total O2 concentrations for the liquid and gas phases were calculated (Taub and Mclaskey 2013). The in vivo fluorescence of the settled algae was measured on a plant stress meter (PSM Mark II, BioMonitor SCI AB, Sweden).…”

Section: Methodsmentioning

confidence: 99%

Diel Oxygen Changes in Closed Ecological Systems; Predictive of Lake Metabolism?

Taub

Bridges

2020

Preprint

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The net oxygen change over a 24-hour day/night cycle in a laboratory study showed strong consistent patterns of (1) gain, when nutrients and light were available; (2) maintain, with daytime gains being matched by nighttime losses; and (3) loss, over brief periods of time during intense zooplankton grazing on previously grown phytoplankton or over long durations without an external source of nutrients. These were simplified aquatic communities closed to the atmosphere, Closed Ecological Systems (CES). Natural lakes are much more complex. While temperate lakes, having a winter accumulation of nutrients followed by sequential algal and zooplankton blooms, may show similar patterns, tropical and flood lakes may exhibit different patterns. Examination of archived lake metabolic studies could yield new insights while looking for these patterns by examining net ecosystem production (NEP), often measured as changes in oxygen concentrations.

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“…Why is this important? Studies of CESs indicate that isolating ecosystems limits chemical cycling, contributing to the potential of ecosystem collapse, most obviously the loss of grazers (Taub & McLaskey 2013Taub 2019). Based on these results, one emergent property of meta-ecosystems is that the fluxes of matter, energy, and information across ecosystem boundaries confers stability through a material version of the "rescue effect" (sensu Stacey et al 1997), which allows them to complete elemental cycling.…”

Section: Box 1: Information In Open Ecosystemsmentioning

confidence: 99%

Filling the Information Gap in Meta-Ecosystem Ecology

Little¹,

Rizzuto²,

Luhring³

et al. 2020

Preprint

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Fluxes of matter, energy, and information over space and time contribute to ecosystems’ functioning. The meta-ecosystem framework addresses the dynamics of ecosystems linked by these fluxes, however, to date, meta-ecosystem research focused solely on fluxes of energy and matter, neglecting information. This is problematic due to organisms’ varied responses to information, which influence local ecosystem dynamics and can alter spatial flows of energy and matter. Furthermore, information itself can move between ecosystems. Therefore, information should contribute to meta-ecosystem dynamics, such as stability and productivity. Specific subdisciplines of ecology currently consider different types of information (e.g., social and cultural information, natural and artificial light or sound, body condition, genotype, and phenotype). Yet neither the spatiotemporal distribution of information nor its perception are currently accounted for in general ecological theories. Here, we provide a roadmap to synthesize information and meta-ecosystem ecology. We begin by defining information in a meta-ecological context. We then review and identify challenges to be addressed in developing information meta-ecology. Finally, we present new hypotheses for how information could impact dynamics across scales of spatio-temporal and biological organization.

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Pressure, O2, and CO2, in aquatic Closed Ecological Systems

Cited by 11 publications

References 15 publications

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

Diel Oxygen Changes in Closed Ecological Systems; Predictive of Lake Metabolism?

Filling the Information Gap in Meta-Ecosystem Ecology

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