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effect of oil and dispersant on growth and chlorophyll a content of the marine microalga tetraselmis suecica.low hydrocarbon concentrations stimulated the growth of tetraselmis suecica, whereas higher concentrations (200 ppm) inhibited growth. the content of chlorophyll a in this microalga was affected in a similar way. crude oil had the most marked effects. dispersant seaklin-101-nt and mixtures of oil and seaklin-101-nt did not show selective toxicity for the microalga, although inhibitory effects could be observed at high concentrations.19846712216
effects of extracts of tetraselmis suecica and isochrysis galbana on the central nervous system.in the course of our continuing pharmacological studies of marine microalgae, we look now at tetraselmis suecica stewart (prasinophyceae) and isochrysis galbana demart (haptophyceae), assessing the effects which aqueous extracts of these algae exert upon the central nervous system. to this end, we have tested for effects upon the following: spontaneous motor activity, body temperature, motor coordination, dextroamphetamine-induced hypermotility, exploratory conduct, muscle relaxation, catalepsy, ...19938316588
cadmium bioaccumulation in tetraselmis suecica: an electron energy loss spectroscopy (eels) study.electron energy loss spectroscopy (eels) was used to study the distribution of cadmium within the microalga tetraselmis suecica when submitted to cadmium contamination. this analytical technique, which is associated to transmission electron microscopes, demonstrated that cadmium was stored specifically in the osmiophilic vesicles of t. suecica. the eels study of the oxidation states revealed that cadmium was stored as cd2+. in addition, the eels quantification showed a significant relationship b ...19979294243
in vitro inhibition of the replication of haemorrhagic septicaemia virus (vhsv) and african swine fever virus (asfv) by extracts from marine microalgae.we have screened for in vitro inhibition of viral replication with extracts from the following marine microalgae: porphyridium cruentum, phaeodactylum tricornutum, tetraselmis suecica, chlorella autotrophica, dunaliella tertiolecta, dunaliella bardawil, isochrysis galbana, isochrysis galbana var tiso, ellipsoidon sp. and tetraselmis tetrathele. we have used as viral models two enveloped viruses of significant economic importance, the viral hemorrhagic septicemia virus (vhsv) of salmonid fish and ...199910588334
comparative efficiencies of different non-toxic microalgal diets in detoxification of psp-contaminated oysters (crassostrea gigas thunberg).experimental psp contamination of adult pacific oysters (crassostrea gigas) by the toxic dinoflagellate alexandrium minutum halim (120 cells.ml-1 continuously maintained in each flume) was carried out in a recirculated seawater system to obtain toxin levels above the safety threshold. in these conditions, 150 to 300 micrograms stx.eq.100 g-1 of shellfish tissues were produced at 16 degrees c within 8 to 15 days, corresponding to field values observed along french coasts. diets based on non-toxic ...200010701176
determination of cadmium partitioning in microalgae and oysters: contribution to the assessment of trophic transfer.alternative methodologies have been applied to the study of cadmium transfer in a food chain: water, microalgae (skeletonema costatum and tetraselmis suecica), oysters (crassostrea gigas). the potential bioavailability of cd in organisms was assessed through partitioning at the cell or tissue levels, and the predictive value of this method was evaluated by determining directly the metal transfer in an experimental food chain model. cd concentrations were lower in s. costatum than t. suecica, in ...200111243323
cadmium removal by living cells of the marine microalga tetraselmis suecica.cadmium removal by living cells of the marine microalga tetraselmis suecica was tested in cultures exposed to different cadmium concentrations (0.6, 3, 6, 15, 30 and 45 mg/l). the ec50 for growth was 7.9 mg cd/l after six days of exposure. the cadmium removed was proportional to the concentration of this metal in the medium and it was dependent on the time of exposure; cultures with higher cadmium concentration removed a higher amount of this metal. in cultures exposed to 0.6 mg/l, t suecica cel ...200212118704
effect of a mono-specific algal diet on immune functions in two bivalve species--crassostrea gigas and ruditapes philippinarum.the impact of diets upon the fatty acid composition of haemocyte polar lipids and consequently upon immune parameters has been tested in the oyster crassostrea gigas and the clam ruditapes philippinarum. oysters and clams were fed each of three cultured algae: chaetoceros calcitrans, which is rich in 20:5(n-3) and 20:4(n-6) and poor in 22:6(n-3) fatty acids; t-iso (isochrysis sp.), which is rich in 22:6(n-3) and deficient in 20:5(n-3) and 20:4(n-6); and tetraselmis suecica, which is deficient in ...200312878673
kinetics of accumulation and transformation of paralytic shellfish toxins in the blue mussel mytilus galloprovincialis.mussels (mytilus galloprovincialis) were fed cultures of the paralytic shellfish poisoning agent alexandrium minutum (strain al1v) for a 15-day period and, for the next 12 days, they were fed the non-toxic species tetraselmis suecica, in order to monitor the intoxication/detoxification process. the toxin content in the bivalve was checked daily throughout the experiment. during the time-course of the experiment, the toxin profile of the bivalves changed substantially, showing increasingly greate ...200314757209
incorporation and modification of dietary fatty acids in gill polar lipids by two bivalve species crassostrea gigas and ruditapes philippinarum.two bivalve species crassostrea gigas and ruditapes philippinarum were fed eight weeks with three mono-specific algae diets: t-isochrysis galbana, tetraselmis suecica, chaetoceros calcitrans, selected on the basis of their polyunsaturated fatty acid (pufa) composition. the incorporation and the modification of dietary fatty acids in c. gigas and r. philippinarum gill lipids were analysed and compared. essential pufa (20:4n-6, 20:5n-3 and 22:6n-3) and non-methylene interrupted pufas (known to be ...200515936706
significance of physicochemical forms of storage in microalgae in predicting copper transfer to filter-feeding oysters (crassostrea gigas).copper distribution has been examined in two microalgae (haslea ostrearia, diatom; tetraselmis suecica, prasinophyceae) exposed to cu at 30 microg/l(-1). exchangeable copper linked at the cell surface was desorbed using 8-hydroxyquinoline-5-sulfonate as complexing agent. then, incorporated copper was separated between soluble and insoluble fractions. in addition, algae were resuspended in acid solutions, the phs of which covered the range existing in the digestive tract of bivalves. considering ...200616463257
biomass production and nutritional value of artemia sp. (anostraca: artemiidae) in campeche, méxico.biomass of the crustacean artemia sp. has multiple uses. the biochemical composition and biomass production of artemia grown from cysts produced by a native population from real de salinas were evaluated under laboratory conditions. nauplii (instar i) were stocked at density of 10 nauplii/ml in 1.5 l tanks, fed with rice bran from day 2 to day 6, and with the microalgae tetraselmis suecica from day 7 to day 15. at the end of the trial (day 15) the average length was 5.34 mm, biomass production w ...200517354454
effects of copper (i) oxide on growth and biochemical compositions of two marine microalgae.in copper based antifouling (af) paints cu (i) oxide was largely used as booster biocide. in this study effect of cu (i) oxide on two marine microalgae, tetraselmis suecica and dunaliella tertiolecta was demonstrated. ec50 (96 hr) concentrations estimated for t. suecica and d. tertiolecta were 1.3 mg l(-1) and 1.34 mg l(-1), respectively. copper (i) oxide induced changes in growth, chlorophyll, carbohydrate and protein contents were observed in t. suecica and d. tertiolecta. at low concentration ...200617402234
a model compound study: the ecotoxicological evaluation of five organic contaminants employing a battery of marine bioassays.this paper describes the ecotoxicological evaluation of five organic contaminants frequently detected in marine sediments (tributyltin, triphenyltin, benzo[a]pyrene, fluoranthene, and pcb 153) using three marine species (vibrio fischeri, tetraselmis suecica, and tisbe battagliai). the sensitivity of each species varied for all compounds. the triorganotins were consistently the most toxic to all species. the applicability of each test system to assess the acute toxicity of environmental contamina ...200817950506
effects of tributyl-tin on a marine microalga, tetraselimis suecica.marine pollutants induce changes in microalgal metabolism. in this study effects of tributyl-tin chloride (tbtcl) on a marine microalga tetraselmis suecica was studied. the changes induced by tbtci on growth rate, viability and biochemicals were assessed. in acute exposure to tbtcl, ec50 estimated for 24 hr was 2.02 microg ml(-1), whereas total lethality was observed at 4 microg ml(-1). in chronic exposure to tbtcl, at higher concentrations (0.5-1 microg ml(-1)) growth rate, chlorophyll pigments ...200718380077
an integrated approach to the toxicity assessment of irish marine sediments: validation of established marine bioassays for the monitoring of irish marine sediments.this paper describes the ecotoxicological evaluation of marine sediments from three sites around ireland representative of a range of contaminant burdens. a comprehensive assessment of potential sediment toxicity requires the consideration of multiple exposure phases. in addition to the evaluation of multi-exposure phases the use of a battery of multi-trophic test species has been advocated by a number of researchers as testing of single or few organisms may not detect toxicants with a specific ...200818456331
high algal production rates achieved in a shallow outdoor flume.a mass culture of tetraselmis suecica grown in seawater enriched with only inorganic nutrients and co(2) in a shallow outdoor flume containing foil arrays to effect systematic vertical mixing achieved average daily production rates of over 40 g ash-free dry wt (afdw)/m(2) over periods as long as one month when grown on a three-day dilution cycle. photosynthetic efficiencies associated with these high production rates averaged 8-11% based on visible irradiance. operation of the system in a one-, ...198618555314
a study of the energetics and economics of microalgal mass culture with the marine chlorophyte tetraselmis suecica: implications for use of power plant stack gases.the marine phytoplankter tetraselmis suecica was grown in shallow outdoor flumes for a period of approximately 6 months at the natural energy laboratory of hawaii. in full sunlight, gross production rates were 15-20 g c m(-2) d(-1). the corresponding photosynthetic efficiencies (pe's) were 9-10%. respiration losses removed about half the gross production. the co(2) utilization efficiencies of 96 +/- 11% were achieved by bubbling co(2) into the culture with the use of a counterflow sump system. a ...199118597318
a test battery approach to the ecotoxicological evaluation of cadmium and copper employing a battery of marine bioassays.heavy metals are ubiquitous contaminants of the marine environment and can accumulate and persist in sediments. the toxicity of metal contaminants in sediments to organisms is dependent on the bioavailability of the metals in both the water and sediment phases and the sensitivity of the organism to the metal exposure. this study investigated the effects of two metal contaminants of concern (cdcl(2) and cucl(2)) on a battery of marine bioassays employed for sediment assessment. cadmium, a known c ...200919283472
microalgal growth enhancement by levoglucosan isolated from the green seaweed monostroma nitidum.microalgal growth was enhanced by the addition of levoglucosan to the culture medium. the growth-enhancing compound levoglucosan was isolated from the green seaweed monostroma nitidum using water extraction, molecular fractionation, deae-cellulose column chromatography, and high-performance liquid chromatography. yield of the compound from seaweed powder was 5 x 10(-3)% (w/w). at 10 mm concentration, levoglucosan enhanced cell growth and the specific growth rate of all feed microalgal species te ...200719396355
trophic transfer of lead through a model marine four-level food chain: tetraselmis suecica, artemia franciscana, litopenaeus vannamei, and haemulon scudderi.the objective of this investigation was to assess the transfer of lead (pb) along an experimental, four-level food chain: tetraselmis suecica (phytoplankton) → artemia franciscana (crustacean, brine shrimp) → litopenaeus vannamei (crustacean, white shrimp) → haemulon scudderi (fish, grunt). t. suecica was exposed to a sublethal dose of pb in solution and then used as the base of a marine food chain. significant differences in pb concentrations were found between exposed organisms of the differen ...201021082317
biological responses of a simulated marine food chain to lead addition.this investigation sought to assess the biological responses to pb along a simplified four-level food chain, from the primary producer, the microalgae tetraselmis suecica, grown in a control medium with < 1 µg/l of pb and exposed to a sublethal dose (20 µg/l of pb) and used as the base of a simulated food chain, through the primary-, secondary-, and tertiary-level consumers, namely, the brine shrimp, artemia franciscana; the white-leg shrimp, litopenaeus vannamei; and the grunt fish, haemulon sc ...201121442651
effects of salinity on growth and survival in five artemia franciscana (anostraca: artemiidae) populations from mexico pacific coast.salinity is an important factor influencing growth and survival of aquatic organisms such as artemia, a valuable aquaculture species. this study evaluated the effects of salinity on a. franciscana populations from different water bodies in mexico's pacific coast. with this purpose, five autochthonous bisexual artemia populations were tested to assess their survival and growth values against salinities of 40, 60, 80, 100 and 120 g/l, under laboratory conditions (25 +/- 2 degrees c; ph 8-10; const ...201121513197
did sulfate availability facilitate the evolutionary expansion of chlorophyll a+c phytoplankton in the oceans?during the mesozoic era, dinoflagellates, coccolithophorids and diatoms became prominent primary producers in the oceans, succeeding an earlier biota in which green algae and cyanobacteria had been proportionally more abundant. this transition occurred during an interval marked by increased sulfate concentration in seawater. to test whether increasing sulfate availability facilitated the evolutionary transition in marine phytoplankton, the cyanobacterium synechococcus sp., the green alga tetrase ...201121627761
sorption isotherm studies of cd(ii) ions using living cells of the marine microalga tetraselmis suecica (kylin) butch.the present work reports the use of living cells of the marine microalga tetraselmis suecica for the biosorption of cadmium ions. for a better understanding of the biosorption characteristics, three fractions of removed cadmium (total, bioadsorbed and intracellular) were measured in the cells after 24 and 72 h of exposure to different initial cadmium concentrations (0.6-45 mg l(-1)). both the langmuir and freundlich models were suitable for describing the sorption of cadmium ions by this microal ...201020573442
filtration rate, assimilation and assimilation efficiency in crassostrea virginica (gmelin) fed with tetraselmis suecica under cadmium exposure.crassostrea virginica is an epibentic filter-feeding bivalve of economical importance in coastal lagoons of the gulf of mexico, locations with increasing inputs of heavy metals such as cadmium that have become environmental stressors. in this study, feeding and assimilation of the species were evaluated as physiological indicators of cadmium exposure. for this purpose, the filtration rate (fr), food assimilation (a) and assimilation efficiency (ae) of oysters from the mandinga lagoon, veracruz, ...201020390836
a novel bacterial isolate from permian ground water capable of aggregating potential biofuel-producing microalga nannochloropsis oceanica imet1.increasing petroleum costs and climate change have resulted in microalgae receiving attention as potential biofuel producers. little information is available on the diversity and functions of bacterial communities associated with biofuel-producing algae. a potential biofuel-producing microalgal strain nannochloropsis oceanica imet1 was grown in permian ground water. changes in the bacterial community structure at three temperatures were monitored by two culture-independent methods and culturable ...201122194289
live algae as a vector candidate for hydrophobic polychlorinated biphenyls translocation to bivalve filter feeders for laboratory toxicity test.live algae carrying hydrophobic xenobiotics can be an effective vector candidate for the chemical translocation to filter feeders in the laboratory toxicity test, but information on their application is lacking. time-course uptake and elimination of polychlorinated biphenyls (pcbs) (0, 50, 100, and 500 ng g(-1) by two key algal foods, isochrysis galbana and tetraselmis suecica, were measured. both of the algae achieved maximum concentration in an hourafter pcbs exposure regardless the chemical c ...201122471217
food quality effects on copepod growth and development: implications for bioassays in ecotoxicological testing.we evaluated effects of six algal species in 25 combinations on growth and reproduction of the harpacticoid copepod nitocra spinipes. in the first lifecycle test, rhodomonas salina, phaeodactylum tricornutum, and dunaliella tertiolecta were used. the results showed that r. salina was the best food, whereas p. tricornutum (0% development success) and d. tertiolecta (41.7% malformations) were poor food items. in the second lifecycle test, a mixture of r. salina, tetraselmis suecica, and thalassios ...200918514311
effects of body-size and season on digestive organ size and the energy balance of cockles fed with a constant diet of phytoplankton.seasonal variation in size-dependence of seawater clearance rate, absorption efficiency, oxygen consumption, gill area, length of the crystalline style and dry weight of digestive gland was analyzed in cockles cerastoderma edule from the mundaka estuary, spain. experimental determinations were performed monthly (from july 1998 to november 1999) in cockles being fed with tetraselmis suecica (organic content: 87.84 +/- 1.95%) at a concentration of 3 mm(3)/l for 3 days. analysis of covariance revea ...200818193430
vertical migration and motility responses in three marine phytoplankton species exposed to solar radiation.diurnal vertical migration in the water column and the impact of solar radiation on motility were investigated in three marine phytoplankton species: tetraselmis suecica, dunaliella salina and gymnodinium chlorophorum. cells were exposed to solar radiation either in ultraviolet radiation (uvr, 280-400 nm) transparent plexiglas tubes (45 cm length, 10 cm diameter) or in quartz tubes under three radiation treatments: pab (280-700 nm), pa (320-700 nm) and p (400-700 nm). the three species displayed ...200717645651
quantitation of chiral amino acids from microalgae by mekc and lif detection.in this work, chiral and nonchiral mekc methods have been combined with lif detection (mekc-lif) to identify and quantify a group of d- and l-amino acids (d/l-aa) in different microalgae samples. the combination of the nonchiral and chiral-mekc-lif methods made the identification of the microalgae amino acids easier, previously derivatized with fitc, providing a double proof on the correct detection of these analytes. three microalgae species, spirulina platensis, dunaliella salina, and tetrasel ...200717592610
bioaccumulation of the antifouling paint booster biocide irgarol 1051 by the green alga tetraselmis suecica. 200617123012
screening for unicellular algae as possible bioassay organisms for monitoring marine water samples.ecotox is an automatic early warning system to monitor potential pollution of freshwater, municipal or industrial waste waters or aquatic ecosystems. it is based on a real time image analysis of the motility and orientation parameters of the unicellular, photosynthetic flagellate euglena gracilis. in order to widen the use of the device to marine habitats and saline waters nine marine flagellates were evaluated as putative bioassay organisms, viz. dunaliella salina, dunaliella viridis, dunaliell ...200616806394
composition and production of thiol constituents induced by cadmium in the marine microalga tetraselmis suecica.time course of intracellular levels of different thiols (phytochelatins, desglycyl-phytochelatins, glutathione, gamma-glutamylcysteine [gamma-glu-cys], and cysteine) were studied in the microalga tetraselmis suecica exposed to different cadmium concentrations for 8 d. the cadmium concentrations assayed were 3, 7.9, 15, and 30 mg/l. contents of thiol compounds synthesized by this microalga changed with cadmium concentration and with time of exposure. cysteine concentrations increased significantl ...200616494233
growth rate of the microalga tetraselmis suecica changes the biochemical composition of artemia species.the impact of different microalgal semicontinuous cultures on growth and biochemical composition in the next link of the food chain was tested using the filter feeder artemia species as a model. the marine microalga tetraselmis suecica was cultured semicontinuously with renewal rates between 10% and 50% and used to feed artemia. microalgal cultures maintained with a low renewal rate that had biochemical composition similar to that of the stationary-phase cultures commonly used in aquaculture pro ...200114961363
class iii metallothioneins in response to cadmium toxicity in the marine microalga tetraselmis suecica (kylin) butch.microalgae are one of the most important organisms in our ecosystems being seriously affected by metal pollution. however, the microalgae tetraselmis suecica (kylin) butch is tolerant to cadmium; the concentration of this metal that reduces the population growth to 50% of the control growth level is 5.8 mg/l after 96 h of exposure. in this study, class iii metallothioneins were investigated for their involvement as a possible tolerance mechanism in this microalga when exposed to cadmium. a set o ...200111521835
acute toxicity of las homologues in marine microalgae: esterase activity and inhibition growth as endpoints of toxicity.the toxicity of two linear alkylbenzene sulfonate (las) homologues (c(10) and c(13)) was evaluated in four marine microalgae (nannochloropsis gaditana, tetraselmis suecica, rhodomonas salina, and isocrysis galbana), using growth inhibition rate and esterase activity (measured by flow cytometry) as endpoints. the inhibitor effect was higher for the c(13) las homologue than for c(11), in both responses analyzed. when both endpoints were compared, the growth inhibition rate was between 2 and 5 time ...200111222038
the effect of mussel size, temperature, seston volume, food quality and volume-specific toxin concentration on the uptake rate of psp toxins by mussels (mytilus galloprovincialis lmk).the accumulation of paralytic shellfish poisoning (psp) toxins by bivalves is a serious threat to public health all over the world. however, very little is known about the uptake kinetics of these toxins and the environmental factors that may modify this process. we have studied the effect of mussel size, temperature, seston volume, food quality, and volume-specific toxin concentration (vostoc), on the uptake rate of paralytic shellfish poisoning (psp) toxins by mussels (mytilus galloprovinciali ...200111165303
acute and acclimated digestive responses of the cockle cerastoderma edule (l.) to changes in the food quality and quantity. ii. enzymatic, cellular and tissular responses of the digestive gland.cockles cerastoderma edule were fed two different concentrations of two diets with different qualities which were achieved by mixing different proportions of ashed silt particles with cells of the microalgae tetraselmis suecica. after 3 days (acute response) and 11 days (acclimated response) of exposure to the diets, we analysed the digestive activity of the digestive gland using cyto-histological and enzymatic techniques. we measured (i) the volumetric fraction of digestive and basophilic cells ...200010967334
acute and acclimated digestive responses of the cockle cerastoderma edule (l.) to changes in food quality and quantity. i. feeding and absorption of biochemical components.cockles cerastoderma edule were fed two different concentrations ( approximately 0.8 and 2 mm(3) l(-1)) of two diets with different qualities ( approximately 10 and 60% of organic content) which were achieved by mixing different proportions of ashed silt particles with cells of the microalgae tetraselmis suecica. clearance, ingestion and absorption rates of organic matter and biochemical components were measured after 3 days (acute response) and 11 days (acclimated response) of exposure to the d ...200010967333
the effect of inorganic and organic mercury on growth kinetics of nitzschia accicularis w. sm. and tetraselmis suecica butch.studies have been made on the toxicities of three inorganic (hgcl2, hgso4, and nh2hgcl) and two organic (ch3hgcl and phenyl mercuric acetate (pma)) mercury derivatives on planktonic algae (nitzschia acicularis w. sm. and tetraselmis suecica butch.) growth kinetics and flourescence changes were used as criteria for assessing algal-metal responses. methylmercury chloride was found to be the more toxic form, inhibiting growth of both species at levels of 0.025 ppm hg. pma inhibited nitzschia at the ...19806450629
growth inhibition of cultured marine phytoplankton by toxic algal-derived polyunsaturated aldehydes.several marine diatoms produce polyunsaturated aldehydes (puas) that have been shown to be toxic to a wide variety of model organisms, from bacteria to invertebrates. however, very little information is available on their effect on phytoplankton. here, we expand previous studies to six species of marine phytoplankton, belonging to different taxonomic groups that are well represented in marine plankton. the effect of three puas, 2e,4e-decadienal, 2e,4e-octadienal and 2e,4e-heptadienal, was assess ...200717942163
[ingestion and digestion of seven species of microalgae by larvae of strombus gigas (mesogastropoda: strombidae)].the potential nutritional value of seven microalgal diets as measured by their ingestibility and digestibility to queen conch strombus gigas larvae was tested with 30 day old larvae reared at 28 degrees c and fed at 1000 cells x ml(-1). the algae were tetraselmis suecica, tetraselmis chuii isochrysis aff. galbana, dunaliella tertiolecta, chlamydomonas coccoides, chaetoceros sp. and thalassiosira fluviatilis. ingestion and digestion were measured by the four nutritional stages studied with epiflu ...200015266796
vitamin e (alpha-tocopherol) production by the marine microalgae dunaliella tertiolecta and tetraselmis suecica in batch cultivation.batch experiments with dunaliella tertiolecta and tetraselmis suecica were performed to investigate alpha-tocopherol (alpha-t) production in time, in order to assess the effect of light availability per cell on the production of this antioxidant. in d. tertiolecta alpha-t content increased during growth, in other words, as the cell density increased and the light availability per cell decreased. in t. suecica the pattern was different: alpha-t content was highest during the exponential phase, de ...200312919791
cultures and thermal analysis of the marine microalga tetraselmis suecica kylin (butch).in this paper, the growth of the marine microalga tetraselmis suecica was investigated using thermogravimetry (tg) and differential thermal analysis (dta) to determine suitable diets for larval and juvenile development in aquaculture systems. microalgae were maintained in synthetic sea water (19@1000 salinity, 18 degrees c constant temperature) and the algal growth was evaluated by cell abundance. exponential, stationary and senescence cells were analyzed by tg and dta. the results of thermal an ...200011449821
Triacylglycerol profiling of marine microalgae by mass spectrometry.Here a method is presented for the determination of triacylglycerol profiles of oleaginous saltwater microalgae relevant for the production of biofuels, bioactive lipids, and high-value lipid-based chemical precursors. A technique is described to remove chlorophyll using a quick, simple solid phase extraction (SPE) and directly compare the intact triacylglycerol composition of four microalgae species (Phaeodactylum tricornutum, Nannochloropsis salina, Nannochloropsis oculata, and Tetraselmis sue ...201121840867
green synthesis of gold nanoparticles by the marine microalga tetraselmis suecica.the application of green-synthesis principles is one of the most impressive research fields for the production of nanoparticles. different kinds of biological systems have been used for this purpose. in the present study, aunps (gold nanoparticles) were prepared within a short time period using a fresh cell extract of the marine microalga tetraselmis suecica as a reducing agent of haucl4 (chloroauric acid) solution. the uv-visible spectrum of the aqueous medium containing aunps indicated a peak ...201020923412
3-alkylpyridinium compounds as potential non-toxic antifouling agents.to date, around thirty bioactive 3-alkylpyridinium compounds, either in monomeric or oligomeric forms, have been identified in marine sponges belonging to the order haplosclerida in this work, we have reviewed their biological activities, which include mainly cytotoxicity, ichthyotoxicity, inhibition of bacterial growth, and enzyme inhibition. most of these activities increase with the increasing degree of oligomerization of the corresponding 3-alkylpyridinium compound. it was shown recently tha ...200616805440
cryopreservation of economically valuable marine micro-algae in the classes bacillariophyceae, chlorophyceae, cyanophyceae, dinophyceae, haptophyceae, prasinophyceae, and rhodophyceae.the ability to routinely cryopreserve micro-algal species reduces costs associated with maintaining large culture collections and reduces the risks of losing particular strains or species through contamination and genetic drift. cryopreservation is also a useful adjunct in aquaculture hatcheries for strains of micro-algae where the nutritional status may change as a result of continuous sub-culture. in this study, cryopreservation of isolates from seven micro-algal classes was investigated. succ ...200616321370
non-toxic antifouling activity of polymeric 3-alkylpyridinium salts from the mediterranean sponge reniera sarai (pulitzer-finali).the antifouling activity and toxicity of polymeric 3-alkylpyridinium salts (poly-aps) isolated from the mediterranean sponge reniera sarai were studied. the activity of these natural products was compared to that of zinc and copper complexes of pyrithione, two non-persistent booster biocides successfully used in current antifouling coatings. larvae of balanus amphitrite (cyprids and nauplii) were used to monitor settlement inhibition and the extent to which inhibition was due to toxicity. the mi ...200314618688
factors affecting the growth and the oil accumulation of marine microalgae, tetraselmis suecica.biomass production and oil productivity in microalgae culture are the most important key factors for algal biodiesel production. however, proper culture condition for the biomass production of microalgae is different from that for the oil production of microalgae. a study on the biomass production of tetraselmis suecica using various light intensities and nitrate concentrations as growth factors was carried out to evaluate proper culture conditions in 20-l batch culture. the effect of nitrate de ...201122011884
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