THIS ARTICLE HAS BEEN RETRACTED: Growth and proximate composition of the Chaetoceros calcitrans f. pumilus under different temperature, salinity and carbon dioxide levels

Raghavan, G.S.V.; Haridevi, C K; Gopinathan, C P

doi:10.1111/j.1365-2109.2008.01964.x

Cited by 34 publications

(24 citation statements)

References 26 publications

(23 reference statements)

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“…The carbohydrate concentration was significantly affected by salinity, the maximum concentrations were detected in late exponential and stationary phases with 25 and 30 psu; these results are consistent with Raghavan et al (2008). Regarding to the effect of salinity, it was observed that the lipid contents decreased as salinity increased.…”

Section: Discussionsupporting

confidence: 86%

Effect of salinity on growth and chemical composition of the diatom Thalassiosira weissflogii at three culture phases

García¹,

López‐Elías²,

Miranda³

et al. 2012

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ABSTRACT. The estuarine diatom Thalassiosira weissflogii (Fryxell & Hasle, 1977) has been widely used as live feed in aquaculture. The growth rate and biochemical composition of microalgae are highly influenced by environmental factors such as, light, salinity and nutrient availability. Salinity is difficult to control in some shrimp laboratories specialized in larvae production, because these laboratories depend upon the levels measured in estuaries or coastal lagoons, which are the water sources for larvae culture. The present study evaluated the effect of different salinities (25, 30, 35, 40, 45 and 50 psu), on the growth and chemical composition of T. weisflogii at three culture phases, under laboratory conditions. The highest growth rate and maximum cell density were found at 25 psu. Decrease in size and striking changes in morphology of the cells were observed at the higher salinities and drastic changes occurred at 50 psu. Protein and carbohydrate content were higher at low salinities (25 and 30 psu) during the stationary phase. The lipid production was higher at low salinities, but diminished as the phase changes occurred; in contrast, the lipid content was unaffected by the growth phase at higher salinities (≥35 psu). The higher growth rate and better biochemical composition were obtained at 25 and 30 psu. Keywords: estuarine diatom, microalgae culture, proximate composition. Efecto de la salinidad en el crecimiento y composición química de la diatomeaThalassiosira weissflogii en tres fases de cultivo RESUMEN. La diatomea estuarina Thalassiosira weissflogii (Fryxell & Hasle, 1977) ha sido utilizada como alimento vivo en acuacultura. La composición bioquímica del alimento vivo afecta la nutrición de los organismos durante su cultivo. La tasa de crecimiento y composición bioquímica de las microalgas están altamente influenciadas por factores ambientales como luz, salinidad y disponibilidad de nutrientes. En algunos laboratorios productores de larvas de camarón, es difícil controlar la salinidad, debido a que éstos dependen de los niveles presentes en estuarios o lagunas costeras, los cuales son la fuente de agua para el cultivo larvario. El presente estudio evaluó el efecto de diferentes salinidades (25, 30, 35, 40, 45 y 50 psu), sobre el crecimiento y la composición proximal de T. weissflogii en tres fases de cultivo, bajo condiciones de laboratorio. Las mayores tasas de crecimiento y la máxima densidad celular se obtuvieron a 25 psu. Se observó una reducción en tamaño y cambios en la morfología de las células a altas salinidades y los cambios drásticos ocurrieron a 50 psu. El contenido de proteínas y de carbohidratos fue más elevado a salinidades bajas (25 y 30 psu), durante la fase estacionaria de crecimiento. La producción de lípidos fue elevada a bajas salinidades y disminuyó a medida que cambiaba de fase; no se observó un efecto de las fases del cultivo sobre el contenido de lípidos en altas salinidades (≥35 psu). La mayor tasa de crecimiento y la mejor composición bioquímica se obtuvieron 25 y 30...

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Section: Discussionsupporting

confidence: 86%

Effect of salinity on growth and chemical composition of the diatom Thalassiosira weissflogii at three culture phases

García¹,

López‐Elías²,

Miranda³

et al. 2012

lajar

View full text Add to dashboard Cite

show abstract

“…Similar findings also have been observed in other species, such as Scenedesmus sp., C. reinhardtii, T. suecica, and P. tricornutum (Gardner et al 2012(Gardner et al , 2013aWhite et al 2012;Mus et al 2013). Several reports also suggest that carbon dioxide addition had no effect on lipid content when nitrogen was replete (de Castro Araújo and Garcia 2005;Raghavan et al 2008), and high TAG or lipid accumulation was observed when high CO 2 was used when nitrogen was limited (Gardner et al 2013a;ToledoCervantes et al 2013). However, the TAG or lipid obtained was unstable and followed by somewhat rapid diminishment in these conditions (Gardner et al 2013a;Toledo-Cervantes et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Physiological responses of freshwater oleaginous microalgae Desmodesmus sp. NMX451 under nitrogen deficiency and alkaline pH-induced lipid accumulation

Xia

Yang

et al. 2014

J Appl Phycol

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Many microalgae are reported to accumulate TAG under high concentrations of bicarbonate and nitrogen deficiency, but their physiological responses remain unknown and the associated applied technology is rarely explored. We found that single high concentration of bicarbonate did not enhance lipid content, except when combined with nitrogen limitation in Desmodesmus sp. NMX451, and the lipid contents obtained were independent from nitrogen limitation and alkalinity stress. Further analysis showed that adding bicarbonate not only retarded the cell cycle, repressed starch accumulation but also promoted polar lipid content. Nitrogen limitation meantime caused protein and chlorophyll degradation with a corresponding increase in total lipid content. Following the aforementioned insights, combined cultivation was performed at an outdoor 5 L scale, and higher biomass and lipid productivities were obtained. These results suggest that bicarbonate can be used as a "trigger" for rapid lipid accumulation in microalgae during nitrogen depletion, and this is an effective new strategy for the cultivation of oleaginous microalgae.

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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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THIS ARTICLE HAS BEEN RETRACTED: Growth and proximate composition of the Chaetoceros calcitrans f. pumilus under different temperature, salinity and carbon dioxide levels

Cited by 34 publications

References 26 publications

Effect of salinity on growth and chemical composition of the diatom Thalassiosira weissflogii at three culture phases

Effect of salinity on growth and chemical composition of the diatom Thalassiosira weissflogii at three culture phases

Physiological responses of freshwater oleaginous microalgae Desmodesmus sp. NMX451 under nitrogen deficiency and alkaline pH-induced lipid accumulation

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

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