Effect of cell density and irradiance on growth, proximate composition and eicosapentaenoic acid production ofPhaeodactylum tricornutum grown in a tubular photobioreactor

Chrismadha, Tjandra; Borowitzka, Michael A.

doi:10.1007/bf02185906

Cited by 132 publications

(49 citation statements)

References 34 publications

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“…These essential fatty acids are important for the treatment and prevention of a range of diseases, and are also important in human nutrition (Okuyama, 1992;Zevenbergen & Rudrum, 1993). Algal species can be selected for the preponderance of a particular fatty acid, and the content of these fatty acids can be manipulated by changing culture conditions (Sukenik, 1991;Chrismadha & Borowitzka, 1994).…”

Section: Vitamins Carotenoids Andfatty Acidsmentioning

confidence: 99%

Microalgae as sources of pharmaceuticals and other biologically active compounds

1995

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In the last decade the screening of microalgae, especially the cyanobacteria (blue-green algae), for antibiotics and pharmacologically active compounds has received ever increasing interest. A large number of antibiotic compounds, many with novel structures, have been isolated and characterised. Similarly many cyanobacteria have been shown to produce antiviral and antineoplastic compounds. A range of pharmacological activities have also been observed with extracts of microalgae, however the active principles are as yet unknown in most cases. Several of the bioactive compounds may find application in human or veterinary medicine or in agriculture. Others should find application as research tools or as structural models for the development of new drugs. The microalgae are particularly attractive as natural sources of bioactive molecules since these algae have the potential to produce these compounds in culture which enables the production of structurally complex molecules which are difficult or impossible to produce by chemical synthesis.

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Section: Vitamins Carotenoids Andfatty Acidsmentioning

confidence: 99%

Microalgae as sources of pharmaceuticals and other biologically active compounds

1995

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“…Photosynthetic microorganisms are also considered for biomineralization by point-source carbon capture [8,20]. In another representation of biological carbon capture, CO 2 is an important substrate for intensive culturing of microalgae [5,18]. CO 2 -enriched air used for sparging was shown to enhance the productivity of microalgae under both laboratory and industrial mass culture conditions [1,25,30].…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of a nonequilibrium model of CO2 fluxes between gas, liquid medium, and algae in a flat-panel photobioreactor

Nedbal

Červený

Keren

et al. 2010

J Ind Microbiol Biotechnol

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Carbon dioxide (CO₂) availability strongly affects the productivity of algal photobioreactors, where it is dynamically exchanged between different compartments, phases, and chemical forms. To understand the underlying processes, we constructed a nonequilibrium mathematical model of CO₂ dynamics in a flat-panel algal photobioreactor. The model includes mass transfer to the algal suspension from a stream of bubbles of CO₂-enriched air and from the photobioreactor headspace. Also included are the hydration of dissolved CO₂ to bicarbonate ion (HCO₃⁻) as well as uptake and/or cycling of these two chemical forms by the cells. The model was validated in experiments using a laboratory-scale flat-panel photobioreactor that controls light, temperature, and pH and where the concentration of dissolved CO₂, and partial pressure of CO₂ in the photobioreactor exhaust are measured. First, the model prediction was compared with measured CO₂ dynamics that occurred in response to a stepwise change in the CO₂ partial pressure in the gas sparger. Furthermore, the model was used to predict CO₂ dynamics in photobioreactors with unicellular, nitrogen-fixing cyanobacterium Cyanothece sp. The metabolism changes dramatically during a day, and the distribution of CO₂ is expected to exhibit a pronounced diurnal modulation that significantly deviates from chemical equilibrium.

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“…Otherwise, the non-transparent sheet will filter PAR and reduce efficiency of the wavelength-shifting technique. Also, since both intensity and spectral distribution of the light have direct impacts on the biochemical composition of microalgal cells, including lipids and the metabolism of fatty acid synthesis (Sukenik, 1991;Chrismadha & Borowitzka, 1994), it is suggested that the biochemical composition of microorganisms should also be considered when choosing a suitable wavelength-shifting strategy.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the specific growth rate, photosynthetic pigment content and biochemical composition (e.g. lipid content), could be influenced by the light source characteristics (Prokop et al, 1984;Chrismadha & Borowitzka, 1994;Matthijs et al, 1996;Hirata et al, 1998;Danesi et al, 2004). Many researchers have investigated the effect of wavelength on the growth of algae and cyanobacteria (Matthijs et al, 1996;Katsuda et al, 2006Katsuda et al, , 2008Wang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

An integrated wavelength-shifting strategy for enhancement of microalgal growth rate in PMMA- and polycarbonate-based photobioreactors

Amrei

Nasernejad

Ranjbar

et al. 2014

European Journal of Phycology

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This study investigates the spectral shifting of UV-A radiation, using fluorescent material, as a tool for enhancing Chlorella sp. growth rate in simulated photobioreactors made of UV-stabilized polycarbonate (PC) and poly (methyl methacrylate) (PMMA). The feasibility of using a fluorescent coating as a wavelength shifter layer, to shift UV-A radiation to the PAR range, was explored. For this purpose, a variety of concentrations of fluorescent dye dissolved in thermoplastic acrylic resin were prepared and used to coat PMMA and PC sheets which then were placed between the radiation source and the culture flask. Compared with the uncoated sheets, the panels coated with the wavelength shifter layer exhibited 74% and 45% (for PC and PMMA substrates, respectively) increase in biomass productivity during the same culture period. It was also found that the elimination of UV-A radiation increased chlorophyll a content of the cells.

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Effect of cell density and irradiance on growth, proximate composition and eicosapentaenoic acid production ofPhaeodactylum tricornutum grown in a tubular photobioreactor

Cited by 132 publications

References 34 publications

Microalgae as sources of pharmaceuticals and other biologically active compounds

Microalgae as sources of pharmaceuticals and other biologically active compounds

Experimental validation of a nonequilibrium model of CO2 fluxes between gas, liquid medium, and algae in a flat-panel photobioreactor

An integrated wavelength-shifting strategy for enhancement of microalgal growth rate in PMMA- and polycarbonate-based photobioreactors

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