Academic literature on the topic 'Tetraselmi suecica'
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Journal articles on the topic "Tetraselmi suecica"
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Drissou, Hidaya, Yassine Ouagajjou, and Adil Aghzar. "Ecophysiology of the Mediterranean mussel Mytilus galloprovincialis L; effect of different microalgae diets and ration on broodstock conditioning." E3S Web of Conferences 298 (2021): 03006. http://dx.doi.org/10.1051/e3sconf/202129803006.
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Three diets based on three microalgae species (Tetraselmi ssuecica, Isochrysis galbana, and Chaetoceros calcitrans) and three feeding rations (1%, 2%, and 3%) were used to understand the ecophysiology of the Mediterranean mussel Mytilus galloprovincialis during Broodstock conditioning. Generally, mussels increase their consumption regarding food availability for all diets, and it is evident that the highest consumption was recorded with a feed ratio of 3%. During the study, I. galbana and C. calcitrans strains show the high consumption (1.58 µg. g-1. h–1 ±0.00) and (1.58µg. g-1. h–1 ±0.00) compared with T. suecica (1.542 µg. g-1. h–1 ±0.023) recorded at 3% food ration of monospecific diets. Same results were recorded for ingestion but with great learning for I. galbana in triscpecific diet (0.70 µg. g-1. h–1 ±0.052) compared to C. calcitrans(0.36 µg. g-1. h–1 ±0.037) and T. suecica (0.25 µg. g-1. h–1 ±0.126), respectively.The analysis of ANOVA has shown that both diet and food availability affect significantly the ingestion (F = 30.9, df = 2, p < 0.001 and F = 4.4, df = 6, p < 0.001) during mussel conditioning.
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Park, Bum Soo, Won-Ji Choi, Ruoyu Guo, Hansol Kim, and Jang-Seu Ki. "Changes in Free-Living and Particle-Associated Bacterial Communities Depending on the Growth Phases of Marine Green Algae, Tetraselmis suecica." Journal of Marine Science and Engineering 9, no. 2 (February 8, 2021): 171. http://dx.doi.org/10.3390/jmse9020171.
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Bacteria are remarkably associated with the growth of green algae Tetraselmis which are used as a feed source in aquaculture, but Tetraselmis-associated bacterial community is characterized insufficiently. Here, as a first step towards characterization of the associated bacteria, we investigated the community composition of free-living (FLB) and particle-associated (PAB) bacteria in each growth phase (lag, exponential, stationary, and death) of Tetraselmis suecica P039 culture using pyrosequencing. The percentage of shared operational taxonomic units (OTUs) between FLB and PAB communities was substantially high (≥92.4%), but their bacterial community compositions were significantly (p = 0.05) different from each other. The PAB community was more variable than the FLB community depending on the growth phase of T. suecica. In the PAB community, the proportions of Marinobacter and Flavobacteriaceae were considerably varied in accordance with the cell number of T. suecica, but there was no clear variation in the FLB community composition. This suggests that the PAB community may have a stronger association with the algal growth than the FLB community. Interestingly, irrespective of the growth phase, Roseobacter clade and genus Muricauda were predominant in both FLB and PAB communities, indicating that bacterial communities in T. suecica culture may positively affect the algae growth and that they are potentially capable of enhancing the T. suecica growth.
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Moejes, Karin, Reshma Sherif, Simone Dürr, Sheelagh Conlan, Alex Mason, and Olga Korostynska. "Real-Time Monitoring of Tetraselmis suecica in A Saline Environment as Means of Early Water Pollution Detection." Toxics 6, no. 4 (September 28, 2018): 57. http://dx.doi.org/10.3390/toxics6040057.
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Biological water pollution, including organic pollutants and their possible transportation, via biofouling and ballast water, has the potential to cause severe economic and health impacts on society and environment. Current water pollution monitoring methods are limited by transportation of samples to the laboratory for analysis, which could take weeks. There is an urgent need for a water quality monitoring technique that generates real-time data. The study aims to assess the feasibility of three sensing techniques to detect and monitor the concentrations of the model species Tetraselmis suecica in real-time using eleven samples for each method. Results showed UV-Vis spectrophotometer detected increasing concentration of Tetraselmis suecica with R2 = 0.9627 and R2 = 0.9672, at 450 nm and 650 nm wavelengths, respectively. Secondly, low-frequency capacitance measurements showed a linear relationship with increasing concentration of Tetraselmis suecica at 150 Hz (R2 = 0.8463) and 180 Hz (R2 = 0.8391). Finally, a planar electromagnetic wave sensor measuring the reflected power S11 amplitude detected increasing cell density at 4 GHz (R2 = 0.8019).
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Jo, Qtae, Eun Jung Choy, and Doo Won Park. "The Sterolic Properties of Heterotrophic Tetraselmis suecica." Fisheries and aquatic sciences 7, no. 1 (March 1, 2004): 34–38. http://dx.doi.org/10.5657/fas.2004.7.1.034.
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Paul, Roshni, Alla Silkina, Lynsey Melville, Sri Suhartini, and Michael Sulu. "Optimisation of Ultrasound Pretreatment of Microalgal Biomass for Effective Biogas Production through Anaerobic Digestion Process." Energies 16, no. 1 (January 3, 2023): 553. http://dx.doi.org/10.3390/en16010553.
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The anaerobic digestion, AD, process presents a solution for sustainable waste management, greenhouse gas mitigation and energy production for growing population needs and requirements. Adopting a biorefinery approach that utilises different feedstock may enhance energy production and support optimisation of the anaerobic digestion process. Algae is a promising feedstock that could be used for energy production via the anaerobic digestion process. Microalgal biomass is rich in carbohydrates and lipids; however, many species of algae exhibit tough cell walls that could also be difficult to digest and may influence or inhibit the efficiency of the AD process. This study concentrated on the comparison of AD remediation of two marine algal biomass species, Tetraselmis suecica and Nannochloropsis oceanica. The two species were pre-treated with an ultrasound technique and compared for their methane production using biochemical methane potential tests. For Tetraselmis, a specific methane production of 0.165 LCH4/KgVS was observed; however, for Nannochloropsis, a value of 0.101 LCH4/KgVS was observed for the samples treated with ultrasound. The BMP results from this study show that among the two micro-algae species tested, Tetraselmis suecica is found to be a better substrate for methane production potential. Contrary to increasing the specific methane production, ultrasound cavitation caused a slight decrease in the specific methane production values for both Nannochloropsis oceanica and Tetraselmis suecica biomass residues. The pre-treatment of the biomass using ultrasound techniques provided comparable results and can be recommended for effective bioenergy production. However, further research is required for the optimisation of the pre-treatment of microalgae and for the integration of microalgal biorefineries for circular economy.
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Kovalev, N. N., S. E. Leskova, and E. V. Mikheev. "Evaluation of salicylic acid effect on Tetraselmis suecica growth, biochemical composition and caloric value." IOP Conference Series: Earth and Environmental Science 981, no. 4 (February 1, 2022): 042001. http://dx.doi.org/10.1088/1755-1315/981/4/042001.
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Abstract The microalgae Tetraselmis suecica is widely studied as a potential producer of triglycerides for biofuels production and number of biologically active substances. Artificial cultivation of microalgae is associated with its use as live food for bivalve molluscs cultivation, sea cucumbers and fish. The efficiency of microalgae cultivation depends on many environmental factors and is an economically demanding process. The use of exogenous stimulants - phytohormones, has a significant effect on the growth and cultivated microalgae biochemical parameters. It was shown that salicylic acid in concentrations of 1.0 - 3.8 x 10-8 M stimulated the growth of the Tetraselmis suecica culture. In comparison with the control, the growth of the culture by 415% was noted, with the addition of phytohormone at a concentration of 3.8 x 10-8 M. Under the influence of salicylic acid, the amount of protein increased 3.2 times, protein 1.3 times, and the synthesis of carbohydrates was suppressed. The caloric content of Tetraselmis suecica was determined by biochemical composition differences, which must be taken into account when determining the cultivation strategy for marine invertebrates, since a certain plastic material is required for each stage of metamorphosis. The toxicity of salicylic acid due to its accumulation in the environment is well known. The results obtained in our work will contribute to the expansion of knowledge about the effect of acid on microalgae and the potential for their use for wastewater bioremediation.
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Lee, Jae-Keun, Jun-Hyuk Lim, and Tae-Yoon Lee. "Cultivation of Tetraselmis suecica under Different Types of Light Emitting Diodes." Journal of Environmental Science International 21, no. 6 (June 30, 2012): 757–61. http://dx.doi.org/10.5322/jes.2012.21.6.757.
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Kim, Se Kwon, Hee Guk Byun, Pyo Jam Park, and Kyoko Adachi. "Purification and Structure of Antioxidative Substance Derived from Tetraselmis suecica." Korean Journal of Fisheries and Aquatic Sciences 35, no. 2 (March 1, 2002): 155–61. http://dx.doi.org/10.5657/kfas.2002.35.2.155.
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AUSTIN, B., E. BAUDET, and M. STOBIE. "Inhibition of bacterial fish pathogens by Tetraselmis suecica." Journal of Fish Diseases 15, no. 1 (January 1992): 55–61. http://dx.doi.org/10.1111/j.1365-2761.1992.tb00636.x.
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Hyung, Jun-Ho, Eun-Joo Kim, Seung-Joo Moon, Nam Seon Kang, and Jaeyeon Park. "Tetraselmis jejuensis sp. nov. (Chlorodendrophyceae), a Euryhaline Microalga Found in Supralittoral Tide Pools at Jeju Island, Korea." Plants 10, no. 7 (June 24, 2021): 1289. http://dx.doi.org/10.3390/plants10071289.
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We found the euryhaline microalga, Tetraselmis jejuensis sp. nov., which was adapted to supralittoral tide pools with salinities varying from 0.3–3.1%. Fifteen strains of T. jejuensis were isolated from Daejeong (DJ) and Yongduam (YO), and clonal cultures were established in the laboratory. Morphological characterization revealed that the cells have a compressed shape, four flagella emerging from a depression near the apex in two opposite pairs, a cup-shaped chloroplast containing one pyrenoid surrounded by starch, and eyespot regions not located near the flagellar base. T. jejuensis cells showed distinct characteristics compared to other Tetraselmis species. First, a regular subunit pattern with honeycomb-like structures was predominantly displayed on the surface in the middle of the cell body. Second, the pyrenoid was invaded by both cytoplasmic channels comprising electron-dense material separated from the cytoplasm, and two branches of small cytoplasmic channels (canaliculi) in various directions, which characterize the subgenus Tetrathele. Eyespot regions containing a large number of osmiophilic globules, packed closely together and arranged in subcircular close packing of diverse sizes, were dispersed throughout the chloroplast. In the phylogenetic analysis of small subunit (SSU) rDNA sequences, the 15 strains isolated from DJ and YO separated a newly branched clade in the Chlorodendrophyceae at the base of a clade comprising the T. carteriiformi/subcordiformis clade, T. chuii/suecica clade, and T. striata/convolutae clade. The strains in the diverging clade were considered to belong to the same species. The SSU rDNA sequences of the DJ and YO strains showed a maximum difference of 1.53% and 1.19% compared to Tetraselmis suecica (MK541745), the closest species of the family based on the phylogenetic analysis, respectively. Based on morphological, molecular, and physiological features, we suggest a new species in the genus Tetraselmis named Tetraselmis jejuensis, with the species name “jejuensis” referring to the collection site, Jeju Island, Korea.
Dissertations / Theses on the topic "Tetraselmi suecica"
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Al-Temaimi, Abdulla. "Effects of stress conditions on lipid production By Botryococcus braunii, Tetraselmis suecica, and Coccomyxa." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/20325/.
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The effects of stress conditions on neutral lipid accumulation by the microalgae Botryococcus braunii, Tetraselmis suecica and Coccomyxa were investigated to assess their suitability for biodiesel production. The growth media (3N-BBM+V for B. braunii, and Coccomyxa and F/2 for T. suecica) were altered to impose salt stress (0.1 and 0.2 M NaCl for BBM medium) and up to 1.2 M NaCl for F/2 medium. Tetraselmis suecica and Coccomyxa were also cultivated under nitrogen depletion conditions (50%, 25% nitrogen and nitrogen free) to monitor growth and investigate neutral lipid accumulation. It was found that B. braunii grew very slowly despite using the relatively nutrient rich BBM medium. It was difficult to reach sufficient biomass to run experiments for B. braunii, but faster growth was achieved using a 2 litre fermenter. B. braunii had a total lipid content of 29% but only 3.64% were neutral (storage) lipids. This is much less than the 30% neutral lipid normally quoted as the minimum requirement for biodiesel production (Chisti, 2007). The B. braunii strain (CCAP 807/1) used failed to grow in the presence of 0.1 or 0.2 M NaCl. Tetraselmis suecica grew in the higher salinity media, but salt stress did not induce higher lipid accumulation. Nitrogen free medium did induce more neutral lipid accumulation in T. suecica even though the growth rate and final biomass level reached were decreased. Tetraselmis suecica had less than the 30% neutral lipid normally quoted as the minimum requirement for biodiesel production, but it is an excellent candidate for production of biodiesel based on the fatty acids produced which are principally C16:0 and C18:1. Neutral lipid accumulation increased rapidly with increasing nitrogen starvation from 25% nitrogen to nitrogen-free medium as Coccomyxa grew to reach stationary phase over four weeks. Nitrogen free medium induced more neutral lipid accumulation (31%) in Coccomyxa, which was the highest percentage found in the current work and meets the 30% neutral lipid figure suggested by Chisti et al. (2007).
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McGivney, Eric. "Comparison of UV-C and Vacuum- UV induced AOT on the acute mortality of microalgae." Thesis, KTH, Mark- och vattenteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171839.
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Advanced oxidation technology (AOT) has been used to destroy microorganisms in ballast water by breaking down the cell membranes. The primary objective of this study was to determine the effects of a ballast water treatment system that uses a combination of UV-C (λ=254 nm), Vacuum-UV (VUV; λ=185 nm) and photocatalytic titanium dioxide (TiO2) on a freshwater algae, Pseudokirchneriella subcapitata, and a marine algae, Tetraselmis suecica. The coupling of a semiconductor, such as TiO2, with a UV source is known as an advanced oxidative technology (AOT). To test the effects of TiO2 and wave length on algae, dose-response experiments were conducted to determine the species median lethal dose (LC50) for each of the following treatments: UV-light emitted at 254 nm (UVλ=254 nm), UV-light emitted at 254 nm in the presence of TiO2 (AOTλ=254 nm), and UV-light emitted at λ=254 nm (90 %) and 185 nm (90 %) in the presence of TiO2 (AOTλ=185 + 254 nm). In both species, TiO2 significantly increased mortality, most likely due to the biologically harmful radicals generated at the TiO2 surface. The addition of the 185 nm wavelength significantly increased cell mortality in P. subcapitata, but not in T. suecica. Across all three treatments, P. subcapitata was more sensitive than T. suecica. The secondary purpose of this study was to assess the applicability of ImageJ, an image analysis software, for highthroughput data to analyze the effectiveness of ballast water treatment. ImageJ has been used to rapidly and accurately perform cell Live/Dead analysis; however, several hurdles were identified.
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Nassiri, Youssef. "Approche par microscopie electronique a transmission analytique des mecanismes de toxicite et de bioaccumulation du cadmium et du cuivre chez skeletonema costatum, tetraselmis suecica et crassostrea gigas." Nantes, 1995. http://www.theses.fr/1995NANT2059.
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La capacite qu'ont les microalgues d'accumuler les metaux traces est bien etablie. Toutefois, les mecanismes de bioaccumulation et de detoxification demeurent largement inconnus, notamment dans le cas du cadmium. Pour la comprehension de ces phenomenes, une etude ultrastructurale de skeletonema costatum et de tetraselmis suecica contaminees par le cadmium et/ou le cuivre, en condition chronique ou aigue a ete entreprise. Il en ressort globalement, que le cuivre, metal le plus toxique pour les deux microalgues, induit les plus fortes modifications structurales. Pour les deux metaux, le developpement d'organites de stockage est en relation avec les doses et les conditions de contamination. La distribution subcellulaire des polluants et des metabolites, impliques dans la bioaccumulation, a ete recherchee par les techniques analytiques de la microscopie electronique: edxs et eels. Cette derniere technique a permis de quantifier les concentrations de polluants ainsi que d'autres elements accumules dans les organites de stockage. La forme chimique de stockage a ete egalement recherchee par l'eels. Chez les deux microalgues, le cadmium est stocke sous forme oxydee cd#2#+, alors que le cuivre peut exister sous forme cu#2#+ et/ou cu#+. L'etroite correlation entre les concentrations de l'azote et du soufre et celle des polluants laisse supposer que des molecules de type phytochelatines peuvent etre impliquees dans les mecanismes de detoxification. Les metaux faiblement lies dans les vesicules de stockage sont susceptibles d'etre transferes le long des chaines trophiques. Aussi, la contamination par voie alimentaire de l'huitre (crassostreagigas) a ete entreprise. L'etude microanalytique (eels) a permis de comparer les voies d'entree et la forme de stockage des polluants dans le cas de la contamination directe ou alimentaire. Il en ressort que l'apport particulaire est aussi important que le transfert metallique par l'eau et que les formes de stockage des polluants sont equivalentes dans les deux cas du transfert
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VENTURINI, SILVIA. "Produzione di biomasse di microalghe marine e loro uso nell’integrazione e parziale sostituzione di mangimi per la spigola ed altre specie ittiche di pregio." Doctoral thesis, 2013. http://hdl.handle.net/2158/797875.
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L’attività di ricerca svolta ha avuto come obbiettivo generale la coltura e la produzione di biomasse di microalghe marine selezionate e di buona qualità nutrizionale e il loro impiego come materia prima per la parziale sostituzione della farina e dell’olio di pesce nei mangimi per acquacoltura. Tutto questo al fine di creare un alimento innovativo perfettamente rispondente ai fabbisogni nutrizionali della spigola e di altre specie ittiche di pregio ed in linea con un modello di allevamento eco-sostenibile che privilegia l’impiego di sostanze e alimenti di origine naturale.
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Piampiano, Elisa. "Interactions in the phycosphere." Doctoral thesis, 2019. http://hdl.handle.net/2158/1150460.
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The interactions occurring in the phycosphere between algae and bacteria are of different kinds and may influence the growth of microalgae. In the past few years, the growing interest on microalgal industrial and biotechnological applications hijacked the attention of the scientific community on the study of microalgae-bacteria interactions. A deeper knowledge of the composition of the microbiota associated to microalgae and on the mechanisms ruling microalgae-bacteria interactions may improve the current mass-culture techniques and enhance the productivity. Tetraselmis suecica is a green marine alga with several biotechnological applications. It is mainly used for aquaculture and cosmetic applications and for the production of bioactive compounds. Nevertheless, still little is known about the microbiota associated to T. suecica and its effect on the microalga growth,
In this thesis the bacterial community associated with T. suecica (strain F&M M33) cultures, grown in different conditions, was described through a metagenomic approach, to evaluate the presence of a stably associated bacterial community. NGS metagenetic analysis were performed on four T. suecica cultures, derived from the same original culture but separated for years, and kept under different growing conditions. Despite the different characteristics of the cultures (seasons and cultures size), a “core” bacterial community was identified, accounting for the large part of the total bacterial community. Among the “core” OTUs it was possible to identify 7 different genera and at least 13 different families. However the relative abundance of the taxa forming the “core” community varied strongly, indicating that growing conditions and/or external contaminations influence the relative abundance of these microorganisms. Moreover, the isolation of strains belonging to the “core” community opened an interesting chance to evaluate the effects of these bacteria on T. suecica growth.
The understanding of which molecules are involved in the interactions is a fundamental part in the study of microalgal-bacteria interaction. The associated bacterial population, release several compounds which may act as microalgal growth promoting features (MPG) affecting different aspects of microalgae such the composition in terms of lipids, pigments or cell dimensions. However, to date only few studies have phenotypically characterized bacteria associated with microalgae for the selection of microalgal growth-promoting bacteria. Therefore, in this thesis 200 bacterial strains were isolated from different cultures of Tetraselmis suecica, identified through 16S rDNA sequencing and phenotypically characterized for MPG traits. 46 strains were been identified as producers of MPG compounds: either indol-3-acetic acid (IAA) and/or siderophores. 22 isolates were tested in co-cultures with the axenic microalga to their effects on T. suecica growth: 4 of them showed a positive effect on microalgal growth. In particular two strains: Vitellibacter sp. and Sphyngopyxis flavimaris were able to enhance considerably the growth of T. suecica, in the condition tested. To deepen the knowledge of the molecules involved in the interactions, the supernatants T. suecica cultures, axenic and in co-culture with Vitellibacter sp. or Sphyngopyxis flavimaris, were analyzed with a non-targeted metabolomics approach. The characterization of the exo-metabolome of T. suecica, was described for the first time. It was possible to identify culture-characteristics compounds and several compounds involved in the metabolism of vitamins. It was observed that Sphyngopyxis flavimaris produce IAA also in co-culture conditions.
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BASSI, NICCOLO'. "The “Green Wall Panel” Characterization and optimization of a disposable flat panel reactors." Doctoral thesis, 2010. http://hdl.handle.net/2158/547864.
Full textBook chapters on the topic "Tetraselmi suecica"
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Vagi, Maria C., Andreas S. Petsas, Maria D. Pavlaki, Niki M. Smaragdaki, and Maria N. Kostopoulou. "Toxic Effects of the Organophosphorus Insecticide Fenthion on Growth and Chlorophyll Production Activity of Unicellular Marine Microalgae Tetraselmis suecica: Comparison between Observed and Predicted Endpoint Toxicity Data." In Insecticides - Agriculture and Toxicology. InTech, 2018. http://dx.doi.org/10.5772/intechopen.72321.
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