Results 111 to 120 of about 324 (136)

Distribution of copper in the diatom Haslea ostrearia simonsen

Marine Environmental Research, 1998
Abstract Haslea ostrearia is a pennate diatom important for oysters culture. This species was selected to study experimentally the distribution of copper in algal cells since the phytoplankton exhibits a high capacity for metal accumulation and thus influences metal transfer to consumers. This alga was grown in batch culture and exposed to copper (30
L. Joux-Arab, B. Berthet, J.M. Robert
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Alginate-entrapped Haslea ostrearia as inoculum for the greening of oysters

Biotechnology Techniques, 1998
Entrapment in calcium alginate beads of the marine diatom, Haslea ostrearia, was successfully used for stock-culture managment and afterwards the sowing of ponds for the greening of oysters. After storage during almost 2 months, viable and cultivable cells were recovered from beads by dissolving alginate matrix but an original way lies in directly ...
Thierry Lebeau, Richard Moan, Vincent Turpin, Jean-Michel Robert   +3 more
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Tetra-unsaturated sesterterpenoids (Haslenes) from Haslea ostrearia and related species

Phytochemistry, 2001
The structures and distributions of C25 highly branched isoprenoid (HBI) alkenes (Haslenes) have been determined following isolation from cultures of the diatoms Haslea ostrearia, Haslea crucigera, Haslea pseudostrearia and Haslea saltstonica. The distributions of the HBIs change between Haslea species and also between different cultures of the same ...
W G, Allard, S T, Belt, G, Massé, R, Naumann, J M, Robert, S, Rowland   +5 more
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Marennine production by agar-entrapped Haslea ostrearia Simonsen

Bioresource Technology, 1999
Abstract The pennate Diatom Haslea ostrearia was successfully immobilized in agar-gel disks and tested for marennine production in batch experiments. The concentration of pigment recovered varied between 34 and 92 mg l−1 liquid medium, according to the initial cell loading of the gel structures, which corresponded to volumetric production rates ...
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Acclimation of Haslea ostrearia to light of different spectral qualities – confirmation of `chromatic adaptation' in diatoms

Journal of Photochemistry and Photobiology B: Biology, 2004
The marine diatom Haslea ostrearia was cultured under light of different qualities, white (WL), blue (BL), green (GL), yellow (YL), red (RL), and far-red (FRL) and at two irradiance levels, low and high (20 and 100 micromolphotonsm(-2)s(-1), respectively).
Jean-Luc, Mouget, Philippe, Rosa, Gérard, Tremblin   +2 more
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Highly branched isoprenoid alcohols and epoxides in the diatom Haslea ostrearia Simonsen

Organic Geochemistry, 2006
Abstract The ability of certain diatoms, notably genera of Haslea and Rhizosolenia , to biosynthesise a series of C 25 highly branched isoprenoid (HBI) alkenes or haslenes seems to have first evolved about 90 million years ago in the late Cretaceous.
Simon T. Belt, Guillaume Massé, Steven J. Rowland, Michel Rohmer   +3 more
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Investigation of marennine quality throughout the main culture phases of Haslea ostrearia in a membrane photobioreactor

Journal of Applied Phycology
International audienceMarennine is a blue pigment excreted by the diatom Haslea ostrearia. This pigment is renowned for its antioxidant and antibacterial properties, which have raised research interest.
Jean-Luc Mouget, Réjean Tremblay, Jean-Sébastien Deschenes   +2 more
exaly   +2 more sources

Copper tolerance in Haslea ostrearia assessed by measurements of in vivo esterase activity

Marine Environmental Research, 1998
Abstract In vivo measurements of Haslea ostrearia esterase activity allowed to assess the effect of copper on metabolic activity. This method, when applied to the micro-plate reader, is effective to screen different cell stages and physiological conditions.
C. Minier, R. Tutundjian, F. Galgani, J.M. Robert   +3 more
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EFFECT OF IRON AND MANGANESE ON THE GROWTH OF THE DIATOM HASLEA-OSTREARIA IN BATCH CULTURE

1994
The importance of iron and manganese for the growth of the ''blue diatom'' Haslea ostrearia Simonsen was studied using an enrichment bioassay method. The bioassays were set up using a culture medium chemically similar to the oyster pond waters supporting the diatom.
Moreau, C., Robert, J. M., Rouillard, I.
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Extraction and quantitative analysis of the blue-green pigment “marennine” synthesized by the diatom Haslea ostrearia

Journal of Applied Phycology, 2002
This study reports further information on “mareninne,” awater-soluble blue-green pigment synthesized by the diatom Hasleaostrearia, which is essential to the greening of maturing oysters inFrench production areas. The extraction process is reported, as well aspreliminary characterization of a partially purified marennine extract,including quantitative ...
Jean-Michel Robert, Michèle Morançais, Elisabeth Pradier, Jean-Luc Mouget, Gérard Tremblin   +4 more
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