Changes in biochemical profile of Tetraselmis gracilis I. Comparison of two culture media

Chemical compositon of three microalgae species for possible use in mariculture

“…The highest chlorophyll a mean value was found in C. closterium (13.76±1.1 mg.L -1 ), followed by T. gracilis (7.12±0.61 mg.L -1 ) and C. gracilis (3.28±0.82 mg.L -1 ), with significant differences among the species (P<0.05) (Figure 2A). These values were higher than those found by Lourenço et al (1997), who cultivated T. gracilis in Conway medium (1.51-3.57 mg.L -1 ) and by Brown (1991), who cultivated C. gracilis in f/2 (0.78 pg.cel -1 or 1.48 mg.L -1 ). High chlorophyll a values were probably due to the high cell density, which diminished irradiation inside the carboy, leading to the increased production of chlorophyll a .…”

“…Similar cellular density values for C. gracilis (95-6,415x10 6 cell.L -1 ) were also determined by Yamashita and Magalhães (1984) using FeNS as the growth medium. Lourenço et al (1997) cultivating T. gracilis in Conway medium, found highest cellular density values (1,71x10 9 cell.L -1 ). The high densities were probably because Conway medium was more nutritive than f2-Guillard.…”

“…The importance of the success of unialgae mass cultures consists in the great variety of fields, such as genetic, cytology, taxonomy and plant physiology, that can utilize this resource (Sukenik and Whanon, 1991;Fidalgo et al, 1998;Renaud et al, 1999). Microalgae chemical composition is frequently determined with the objective to provide the necessary nutritional balance for the captive animals (Whyte, 1987;Brown et al 1997Southgate et al, 1998;Caers et al, 1999;McCausland et al, 1999), and also to determine the biochemical variation of the microalgae composition with respect to the nutritional medium in which the microalgae are being cultivated (Antia et al, 1977;Fabregas et al, 1985a andb, 1986;Melo et al, 1993;Lourenço et al, 1997). In Brazil, the studies about microalgae chemical composition are recent and limited to studies about alternative culture mediums (Koening et al, 1990a(Koening et al, , 1998Melo et al, 1993) or to the comparisons of the microalgae chemical composition in relation to the nutritional medium (Koening, 1990b;Lourenço et al, 1998).…”

EFECTO DEL PROCESAMIENTO TÉRMICO SOBRE EL PERFIL DE ÁCIDOS GRASOS DE LA MICROALGAAphanothece microscopica NägeliEFFECT OF THERMAL PROCESSING ON FATTY ACIDS PROFILE OFAphanothece microscopica NägeliMICROALGAE

“…(1) 40 ºC-7mm; (2) 50 ºC-7mm; (3) 60 ºC-7mm técnicas de preservación a las cuales son sometidas (Lourenço et al, 1997;Morist et al, 2001). La concentración de lípidos totales de la biomasa de Aphanothece microscopica Nägeli para las diferentes condiciones de secado se muestran en la Figura 1.…”

Bioaccumulation of PBDE congener 2,2′,4,4′-tetrabromodiphenyl ether by Heterosigma akashiwo in response to different nutrient concentrations

“…The biochemical composition, including cellular protein, carbohydrate and lipid levels, varied in microalgae with nutrient availability. The declining levels of nitrogen and phosphorus in the media inhibited protein synthesis, but induced the storage of carbohydrates and lipids in microalgae (Fogg 1959, Berdalet et al 1994, Kilham et al 1997, Lourenço et al 1997, Li et al 2005, Zhao et al 2009, Lai et al 2011). The lipid content per H. akashiwo cell exhibited a reduction with the increase of initial nitrate and phosphate concentrations (Fig.…”