Relevant bibliographies by topics / Tetraselmi

Academic literature on the topic 'Tetraselmi'

Author: Grafiati
Published: 10 March 2023

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Journal articles on the topic "Tetraselmi"

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Eboibi, B. E. "Elucidation of Sodium Hydroxide Catalyst and Solids Loading for Thermochemical Liquefaction of Tetraselmis sp. Microalga." Nigerian Journal of Technological Development 17, no. 2 (July 22, 2020): 134–41. http://dx.doi.org/10.4314/njtd.v17i2.9.

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The production of biocrude with and without sodium hydroxide catalyst (Na2CO3) through hydrothermal liquefaction of Tetraselmis sp. microalga at different organic solids loading was investigated. The HTL experimental study was conducted at reaction temperatures of 310oC, 330oC, 350oC and 370oC at 5 min fixed reaction time with organic solids loading of 10%w/w, 15%w/w, 20%w/w, 25%w/w, 30%w/w, and at 40%w/w. The results of the study showed that organic solids loading above 20%w/w had no substantial changes on biocrude yield. The catalyst had very little effect on the yield of biocrude but substantially enhanced its quality when compared with non-catalysed reactions. Although, Na2CO3 catalyst may be used for HTL of Tetraselmi sp. in laboratory-scale studies, it is highly unnecessary for commercial-scale. Thus potentially reducing the production cost in future commercialization of HTL-alga-biorefinery. Keywords: Biocrude, Na2CO3 catalyst, hydrothermal liquefaction, Microalga, organic solids loading
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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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Purba, Elida, Sakha Abdussalam, and Agus Rivaldy K. "Batas Toleransi Maksimal Laju Alir Gas Umpan dengan Konsentrasi Co2 Konstan pada Mikroalga (Tetraselmiss Chuii dan Spirrulina Sp) dalam Fotobioreaktor." Inovasi Pembangunan : Jurnal Kelitbangan 5, no. 03 (December 1, 2017): 206–14. http://dx.doi.org/10.35450/jip.v5i03.45.

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Penelitian ini membahas tentang penentuan batas laju alir yang diberikan kepada mikroalga Tetrashelmis chuii dan Spirrulina sp terhadap ketahananya dalam hal mengadsorpsi CO2 dengan konsentasi umpan CO2 yang cukup besar. Tujuan dari penelitian ini adalah menentukan batas toleransi laju alir gas umpan dengan konsentrasi CO2 konstan pada mikroalga (Tetraselmiss chuii dan Spirrulina sp) dalam fotobioreaktor. Hal ini diperlukan untuk mengkarakteristikan jenis mikroalga terhadap ketahanannya dalam menerima umpan gas yang diberikan untuk mengurangi jumlah CO2 dengan dilakukannya variasi laju alir umpan masuk fotobioreaktor yaitu 1 l/menit , 1,5 l/menit dan 2 l/menit dengan konsentrasi CO2 sebesar 33 %. Didapatkan hasil bahwa laju alir yang optimum yang dimiliki oleh mikroalga paling baik dalam penyerapan CO2 yaitu Spirrulina sp dengan kemampuan laju alir 1 l/menit dengan penyerapan sebesar 83,13 % dibanding Tetraselmis chuii dengan laju alir 1,5 l/menit dengan penyerapan sebesar 76,10 %.
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Negara, Bertoka Fajar SP, Nining Nursalim, Nurlaila Ervina Herliany, Person Pesona Renta, Dewi Purnama, and Maya Angraini Fajar Utami. "PERANAN DAN PEMANFAATAN MIKROALGA Tetraselmis chuii SEBAGAI BIOETANOL." JURNAL ENGGANO 4, no. 2 (September 30, 2019): 136–47. http://dx.doi.org/10.31186/jenggano.4.2.136-147.

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Bahan bakar fosil merupakan bahan bakar yang berasal dari pelapukan sisa mahluk hidup. Bahan bakar fosil bersifat tidak terbaharukan, maka pencarian bahan bakar alternatif yang terbarukan perlu dilakukan salah satunya bioetanol. Tetraselmis chuii dapat dijadikan bahan baku pembuatan bioetanol. Tujuan dari penelitian ini adalah untuk mengetahui volume bioetanol yang dihasilkan dari Fermentasi Tetraselmis chuii. Kultur Tetraselmis chuii selama 6 hari. Hidrolisis dilakukan dengan menambahkan H2SO4 0,2 M pada suhu 121oC dengan tekanan 1 atm selama 30 menit, Fermentasi dengan Saccharomyces cereviseae selama 5 hari. Penelitian ini menghasilkan gula reduksi Tetraselmis chuii dengan kadar gula 4% dan hasil fermentasi Tetraselmis chuii menghasilkan 12 ml etanol dengan konsentrasi 1%.THE ROLE AND UTILIZATION OF MICROALGAE Tetraselmis chuii AS BIOETHANOL. Fossil fuels are the fuel produced from the weathering of living things. Fossil fuels are non-renewable, therefore the research of renewable energy is needed. Bioethanol could be good solution. Tetraselmis chuii can be used as the raw material for bioethanol. The purpose of this study was to determine the volume of ethanol through fermentation of Tetraselmis chuii. Tetraselmis chuii was cultured for 6 days. The hydrolysis used 0.2 M H2SO4 at 1210C and pressure of 1 atm for 30 minutes, and the fermentation used Sacscharomyces cereviseae for 5 days. The results showed that Tetraselmis chuii produced 4% sugar and The fermentation produced 1% bioethanol with volume was 12 ml.
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Setyawati, Febri, Woro Hastuti Satyantini, Muhammad Arief, and Kismiyati Kismiyati Pujiastuti. "TEKNIK KULTUR Tetraselmis chuii DALAM SKALA LABORATORIUM DI PT. CENTRAL PERTIWI BAHARI, REMBANG, JAWA TENGAH." Journal of Aquaculture and Fish Health 7, no. 2 (June 1, 2018): 63. http://dx.doi.org/10.20473/jafh.v7i2.11249.

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Pakan merupakan kunci keberhasilan dalam budidaya perikanan, karena berpengaruh terhadap ketahanan dan perkembangan larva. Jenis pakan yang dapat diberikan pada ikan ada dua jenis, yaitu pakan alami dan pakan buatan. Salah satu jenis pakan alami yang dapat dimanfaatkan sebagai pemenuhan kebutuhan pakan budidaya yaitu fitoplankton jenis Tetraselmis chuii. Mikroalga Tetraselmis chuii merupakan salah satu mikroalga yang mudah dibudidayakan dan memiliki nilai gizi tinggi yaitu, kandungan protein 74%, lemak 4%, dan karbohidrat sebanyak 21%. Praktek Kerja Lapang ini bertujuan untuk mempelajari, memahami, serta mempraktekkan secara langsung tentang teknik kultur pakan alami Tetraselmis chuii skala laboratorium dan mengetahui kendala dalam teknik kultur pakan alami Tetraselmis chuii skala laboratorium. Pertumbuhan Tetraselmis chuii dalam kultur skala labolatorium mengalami puncak populasi pada hari keenam mencapai 3.240.000 sel/ml. Hal ini menunjukkan bahwa pertumbuhan Tetraselmis chuii sangat lama. Didapatkan inokulasi awal 550.000 sel/ml dan mengalami peningkatan hingga hari keenam. Hal ini menunjukan pertumbuhan Tetraselmis chuii mengalami fase eksponensial. Kemudian, pada hari ketujuh mengalami penurunan mencapai 209.000 sel/ml lalu pada hari kedelapan mengalami peningkatan mencapai 249.000 sel/ml diduga mengalami periode kriptik, yaitu sel-sel yang masih hidup memanfaatkan tambahan nutrisi dari sel-sel yang lisis. Pertumbuhan Tetraselmis chuii hari kesembilan sampai hari keempatbelas mengalami penurunan hingga 186.000 sel/ml
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Pagels, Fernando, Helena M. Amaro, Tânia G. Tavares, Berta F. Amil, and A. Catarina Guedes. "Potential of Microalgae Extracts for Food and Feed Supplementation—A Promising Source of Antioxidant and Anti-Inflammatory Compounds." Life 12, no. 11 (November 16, 2022): 1901. http://dx.doi.org/10.3390/life12111901.

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Microalgae are known producers of antioxidant and anti-inflammatory compounds, making them natural alternatives to be used as food and feed functional ingredients. This study aimed to valorise biomass and exploit new applications and commercial value for four commercially available microalgae: Isochrysis galbana, Nannochloropsis sp., Tetraselmis sp., and Phaeodactylum tricornutum. For that, five extracts were obtained: acetone (A), ethanol (E), water (W), ethanol:water (EW). The antioxidant capacity (ABTS•+/DPPH•/•NO/O2•−/ORAC-FL) and anti-inflammatory capacity (HBRC/COX-2) of the extracts were screened. The general biochemical composition (carbohydrates, soluble proteins, and lipids) and the main groups of bioactive compounds (carotenoids, phenolic compounds, and peptides) of extracts were quantified. The results of antioxidant assays revealed the potential of some microalgae extracts: in ABTS•+, Nannochloropsis sp. E and Tetraselmis sp. A, E, and P; in DPPH•, Tetraselmis sp. A and E; in •NO, P. tricornutum E and EW; in O2•−, Tetraselmis sp. W; and in ORAC-FL, I. galbana EW and P. tricornutum EW. Concerning anti-inflammatory capacity, P. tricornutum EW and Tetraselmis sp. W showed a promising HBRC protective effect and COX-2 inhibition. Hence, Tetraselmis sp. and P. tricornutum extracts seem to have potential to be incorporated as feed and food functional ingredients and preservatives.
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Boopathy, Annakkili Baskara, Thanasekaran Jayakumar, Senthil Chinnasamy, Muthu Ganesan Rajaram, Natarajan Mohan, Subramani Nagaraj, Ramasamy Rengasamy, Manjunath Manubolu, Joen-Rong Sheu, and Chao-Chien Chang. "Biomass and Lipid Production Potential of an Indian Marine Algal Isolate Tetraselmis striata BBRR1." Energies 13, no. 2 (January 10, 2020): 341. http://dx.doi.org/10.3390/en13020341.

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Four different strains of marine algae viz. Tetraselmis tetrathele, Tetraselmis striata, Tetraselmis chuii, and Tetraselmis gracilis were isolated from the saltpans in Kovelong, Chennai, Tamil Nadu, India. The systematic position of Tetraselmis striata BBRR1 was confirmed through molecular identification. Under laboratory conditions, T. striata Butcher BBRR1 grown in f/2-medium recorded highest biomass concentration of 0.58 ± 0.021 g L−1, volumetric productivity of 0.025 ± 0.004 g L−1 d−1, 19 ± 2.3% proteins, 17 ± 1.5% carbohydrates, and 15 ± 2.4% lipids. Volumetric biomass productivity of 0.063 ± 0.08 g L−1 d−1, specific growth rate of 0.45 day−1 and lipid content of 19.42 ± 0.98% were recorded for the alga T. striata Butcher BBRR1 cultivated in 10-m2 open raceway ponds using Modified CFTRI ABRR1 medium. The fatty acid profile of T. striata Butcher BBRR1 showed the presence of 33.14% palmitic acid, 22.64% 11-octadecenoic acid, and 21.94% heptadecanoic acid. This study confirms the feasibility of cultivating the marine alga T. striata in open raceway ponds to produce biomass, which can be used for the production of biofuels.
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Ningsih, Diah Ratna, Endang L. Widiastuti, Sri Murwani, and Tugiyono Tugiyono. "KADAR LIPID TIGA JENIS MIKROALGA PADA SALINITAS YANG BERBEDA." Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati 4, no. 1 (March 1, 2017): 23–29. http://dx.doi.org/10.23960/jbekh.v4i1.122.

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Penelitian ini bertujuan untuk mengetahui laju pertumbuhan dan kandungan lipid pada ketiga jenis mikroalga yang dikultur pada media dengan salinitas yang berbeda. Penelitian dilakukan dengan menggunakan metode rancangan acak lengkap faktorial dengan 3 perlakuan yaitu salinitas 20, 30, dan 40 ppt pada mikroalga jenis Nannochloropsis sp., Tetraselmis sp., dan Porpyridium sp masing-masing sebanyak 3 kali ulangan. Mikroalga dikultur pada skala laboratorium selama 8 hari setelah itu dipanen untuk diukur kadar lipidnya. Hasil kultur selama 8 hari menunjukkan laju pertumbuhan spesifik rata-rata tertinggi pada Nannochloropsis sp. terdapat pada salinitas 40 ppt yaitu 12%/hari, sedangkan untuk Tetraselmis sp. tertinggi pada salinitas 20 ppt yaitu 7%, dan untuk Porpyridium sp. tertinggi pada salinitas 30 ppt yaitu 5%/hari. Berdasarkan hasil penelitian diperoleh jumlah lipid tertinggi terdapat pada Tetraselmis sp. pada salinitas 20 ppt yaitu sebesar 2,64% dan jumlah lipid terendah terdapat pada Tetraselmis sp. pada salinitas 40 ppt yaitu sebesar 0,19%. Dari hasil penelitian dapat disimpulkan bahwa laju pertumbuhan spesifik rata-rata per hari tertinggi terdapat pada jenis Nannochloropsis sp pada salinitas 40 ppt yaitu sebesar 12% dan jumlah lipid tertinggi terdapat pada mikroalga jenis Tetraselmis sp. pada salinitas 20 ppt yaitu sebesar 2,64%.
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Ardika, Kadek, Muhdiat Muhdiat, and I. Nyoman Restiada. "PENGGUNAAN JENIS PAKAN BERBEDA PADA KULTUR ROTIFER (Brachionus rotundiformis)." Buletin Teknik Litkayasa Akuakultur 11, no. 1 (December 9, 2016): 57. http://dx.doi.org/10.15578/blta.11.1.2013.57-60.

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Keberhasilan kultur rotifer akan sangat tergantung dari jenis dan mutu pakan yang diberikan. Beberapa jenis fitoplankton yang dapat digunakan sebagai pakan rotifer adalah Nannochloropsis oculata dan Tetraselmis sp. Kegiatan ini bertujuan untuk mengetahui pengaruh penggunaan jenis pakan berbeda terhadap pertumbuhan populasi rotifer, yaitu jenis fitoplankton Nannochloropsis oculata dan Tetraselmis tetrahele, dengan dosis pemberian pakan sebagai berikut: Nannochloropsis oculata 250.000 sel/ind./hari, sedangkan Tetraselmis tetrahele 25.000 sel/ind./hari diberikan dua kal i sehari , kepadatan awal rotifer sebanyak 20 ind./mL, wadah kultur menggunakan bak fiber glas volume 30 liter sebanyak 6 buah dengan menerapkan tiga ulangan pada masing-masing perlakuan. Hasil pengamatan pertumbuhan rotifer selama 4 hari, menunjukkan bahwa kepadatan populasi rotifer tertinggi diperoleh pada pemberian jenis pakan Tetraselmis tetrahele dengan kepadatan 436 ind./mL, sedangkan pada pemberian jenis pakan Nannochloropsis oculata hanya 168 ind./mL.
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Khoironi, Adian, Khoirul Huda, Imron Hambyah, and Inggar Dianratri. "Pengaruh mikroplastik polietilen dan oxo-degradable (Oxium) pada pertumbuhan Mikroalga Tetraselmis Chuii." Jurnal Ilmu Lingkungan 19, no. 2 (June 20, 2021): 211–18. http://dx.doi.org/10.14710/jil.19.2.211-218.

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Salah satu cara yang digunakan di Indonesia dalam menanggulangi berlimpahnya jumlah sampah plastik di lingkungan perairan adalah dengan menggantikan kantong plastik berbahan polimer polietilen (PE) dengan plastik oxodegradable yang disebut oxium. Penelitian ini dilakukan dengan tujuan untuk melihat pengaruh mikroplastik polietilen jenis HDPE (High Density Polyethylene) dengan plastic oxodegradable oxium. Penelitian dilakukan dengan menggunakan mikroalga Tetraselmis chuii sebagai mikroorganisme yang akan mendapat perlakuan mikroplastik dengan konsentrasi yang berbeda. Dari Hasil pengukuran optical density untuk menentukan laju pertumbuhan mikroalga Tetraselmis Chuii menunjukkan bahwa laju pertumbuhan Tetraselmis dengan perlakuan mikroplastik polietilen mengalami penurunan yang signifikan dibandingkan dengan mikroplastik oxium. Konsentrasi mikroplastik ikut berperan dalam menentukan laju pertumbuhan Tetraselmis chuii di mana pada perlakuan mikroplastik oxium terjadi penurunan hingga 37,66% pada konsentrasi mikroplastik 300mg/500mL dan 81,70% pada perlakuan mikroplastik polietilen dengan konsentrasi 200mg/500mL. Mikroplastik polietilen dan oxium memberikan dampak negatif pada organisme tingkat rendah disebabkan oleh kemampuannya dalam melepas bahan aditif yang bersifat toksik sehingga diperlukan solusi yang lebih baik untuk menggantikan fungsi plastik dengan bahan yang lebih ramah bagi lingkungan hidup. ABSTRACTOne of the methods used in Indonesia in tackling the abundance of plastic waste in the aquatic environment is to replace plastic bags made of polyethylene (PE) polymer with oxodegradable plastic called oxium. This research was conducted with the aim of examining the effect of HDPE (High Density Polyethylene) microplastic polyethylene with oxodegradable oxium plastic. The research was conducted using the microalgae Tetraselmis chuii as microorganisms that will receive microplastic treatment with different concentrations. From the results of optical density measurements to determine the growth rate of Tetraselmis chuii microalgae, it was shown that the growth rate of Tetraselmis with polyethylene microplastics treatment decreased significantly compared to oxium microplastics. The concentration of microplastics played a role in determining the growth rate of Tetraselmis chuii where in the oxium microplastic treatment there was a decrease of up to 37.66% at the microplastic concentration of 300mg/500mL and 81.70% at the polyethylene microplastic treatment with a concentration of 200mg/500mL. Polyethylene and oxyum microplastics have a negative impact on low-level organisms due to their ability to release toxic additives so that better solutions are needed to replace the function of plastics with materials that are more environmentally friendly.
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Dissertations / Theses on the topic "Tetraselmi"

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Almutairi, Adel. "Production of biofuels from the green alga Tetraselmis." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/10720/.

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The research described in thesis deals with the production of biofuels and fine chemicals from the green alga Tetraselmis suecica. Firstly, the identity of the strain received from the culture collection was confirmed using molecular techniques (18S rDNA sequencing) and electron microscopy. Secondly, a fully defined artificial seawater medium was developed to grow T. suecica and then the tolerance of this alga to salinity and pH changes was established. The neutral lipid (triacylglycerol) production was measured using Nile Red dye after stressing T. suecica cells with high salinity (up to 1 M NaCl) and pH values (pH 7 to 9). It was established that high salinity and high pH values tended to induce higher levels of triacylglycerol in the algal cells. Then fatty acid profiles of T. suecica cells were analyzed by gas chromatography–mass spectrometry (GC-MS) after direct transesterification with hydrochloric acid in methanol. Higher salinity grown cells showed higher levels of monounsaturated fatty acids, which are ideal for biodiesel production. The possibility of growing T. suecica on a larger scale was investigated using a 2 L airlift photobioreactor and the response to higher levels of CO2 was assessed in the airlift bioreactor. The effect of reusing the medium on the growth of T. suecica was examined with the aim of developing anintegrated algal biorefinery process using T. suecica as the feedstock.
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Fernandes, Isabel Cristina Xavier. "Desenvolvimento de pães sem glúten enriquecidos com Tetraselmis chuii." Master's thesis, ISA, 2019. http://hdl.handle.net/10400.5/19490.

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Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
Atualmente, devido ao aumento do número de pessoas que sofrem da doença celíaca, o mercado dos alimentos isentos de glúten tem vindo a expandir a oferta, no entanto, para além de não serem sensorialmente apelativos, o preço final ao consumidor é elevado. A ausência do glúten no pão representa um desafio tecnológico, pois é necessário recorrer a matérias primas alternativas e que mimetizem as propriedades elásticas assumidas pelo glúten. Em simultâneo, também tem crescido a procura por alimentos com ingredientes bioativos e as microalgas são reconhecidas como fonte de diversos compostos com impacto positivo na saúde humana. O principal objetivo deste trabalho foi o desenvolvimento de pães isentos de glúten com incorporação da alga Tetraselmis chuii. Esta é uma microalga verde unicelular com propriedades nutricionais interessantes para a saúde humana. No decorrer do trabalho foi desenvolvida uma formulação controlo à base de farinha de trigo sarraceno, farinha de arroz e amido de batata, utilizada como base para estudar o impacto da adição de teores de alga de 1%, 2% e 4% (m/m). Avaliou-se a textura e reologia das massas, o perfil de envelhecimento do pão, os parâmetros de cor da massa e do pão, a atividade da água e humidade do miolo dos pães, o volume final dos pães e as perdas durante a cozedura dos pães. A incorporação de biomassa microalgal de Tetraselmis chuii originou produtos com características tecnológicas dependentes do nível de incorporação de microalga. Para níveis de 1% e 2% (m/m) verifica-se uma desestabilização da estrutura desenvolvida pelo amido e o HPMC, obtendo-se pães mais compactos, mais firmes e com menor volume do que o pão controlo. Para 4% (m/m) de incorporação de Tetraselmis chuii, as proteínas da microalga em associação com o amido e o HPMC desenvolvem um outro tipo de estrutura, reforçando a viscoelasticidade da massa, dando origem a um pão com maior volume e menor firmeza. Verificou-se ainda que a incorporação de microalga tem um efeito positivo no envelhecimento do pão. A análise sensorial hedónica realizada a três das formulações – controlo, 1% e 4% (m/m) de microalga, recorrendo a um painel de 32 provadores não treinados, resultou na eleição da formulação com 1% (m/m) de microalga como a preferida do painel
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Franca, Joana Rita Afonso Horta. "Caracterização nutricional e de bioatividade de microalgas (Tetraselmis sp. IMP3, Tetraselmis sp. CTP4 e Skeletonema sp.). Estudo de estabilidade de extratos de Skeletonema." Master's thesis, ISA/UL, 2019. http://hdl.handle.net/10400.5/18342.

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Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia / UL
As microalgas são ainda um recurso aquático em fase inicial de exploração. A composição em ácidos gordos, compostos fenólicos, perfil fenólico e bioatividades foram analisadas em três novas estirpes de microalgas: Tetraselmis sp. IMP3, Tetraselmis sp. CTP4 e Skeletonema sp. Foi também estudada a estabilidade de extratos de Skeletonema sp. não encapsulados e microencapsulados em inulina
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Gonçalves, Fabio da Cunha. "O Fitoplâncton e a dialética da balneabilidade de praias: um estudo de caso na Praia de Itacoatiara, Niterói, RJ." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8186.

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A praia de Itacoatiara, área de proteção ambiental, localizada no município no Niterói- RJ, tem importante contribuição para o turismo ecológico da região. Busca a certificação ambiental do programa Bandeira Azul e este trabalho buscou cumprir determinação de monitoramento ambiental como um dos critérios do programa. O objetivo foi avaliar a proliferação de microalgas marinhas como sensor da qualidade da balneabilidade diagnosticada através de um bioindicador, o fitoplâncton. As coletas foram realizadas em dois pontos nos meses de novembro de 2008 e de janeiro a março de 2009. Foram encontradas 52 unidades taxonômicas, sendo que 33 pertencem às diatomáceas (Bacillariophyceae), 15 dinoflagelados (Dinophyceae), 1 às cianobactéria (Cyanophyceae), 1 euglenofícea (Euglenophyceae), 1 crisofícea (Chrysophyceae) e 1 prasinofícea (Prasinophyceae) e fitoflagelados. A metodologia seguida foi de sedimentação em cubetas e analisadas em microscópio invertido. A praia de Itacoatiara está caracterizada por sofrer influência de ambientes adjacentes com massas dágua comprometidas promovendo proliferações algais monoespecíficas com densidades consideradas de Bloom. As espécies dominantes foram Tetraselmis sp (Prasinophyceae) considerada potencialmente nociva por apresentar contaminação visual e as Cianobactérias que podem produzir toxinas. Os parâmetros vento, ondulação e maré foram apontadas como os principais carreadores das massas dágua comprometidas até a região estudada. Por cumprir o objetivo geral, conclui-se que o fitoplâncton marinho pode ser utilizado como parâmetro para a caracterização e qualidade da balneabilidade de praias.
The Itacoatiara beach, area of environmental protection, in the municipality in Niterói, has an important contribution to the ecological tourism in the region. Search the environmental certification of the "Blue Flag" and this work seeks to achieve environmental monitoring determination as one of the criteria of the program. The objective was to evaluate the proliferation of marine microalgae. The quality of bathing was diagnosed by a bioindicator, the phytoplankton. The collections were made during the months from November 2008 to March 2009. 52 taxonomic units were found, with 33 belonging to the diatoms (Bacillariophyceae), 15 dinoflagellates (Dinophyceae), 1 cyanobacteria (Cyanophyceae), 1 Euglenophyceae, 1 Chrysophyceae and 1 Prasinophyceae and phytoflagellates. The methodology was based in sedimentation cuvette and analysis in inverted microscope. The beach is characterized by the Itacoatiara influence of environments adjacent to the water masses involved in promoting proliferation monospecific algae densities considered of "Bloom". The dominant species were Tetraselmis sp (Prasinophyceae) considered potentially harmful contamination by presenting visual and cyanobacteria that can produce toxins. The parameters wind, waves and tides have been identified as the main carriers of the water masses committed to the region studied. By meeting the general objective, we find that the marine phytoplankton can be used as parameter for the characterization and quality of balneability of beaches.
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Song, Xiu-Zhen. "Immunocytochemical localization of photosystems I and II in the green alga Tetraselmis subcordiformis." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26152.

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The distribution of photosystem I (PS I) and photosystem II (PS II) in a primitive green alga Tetraselmis subcordiformis, which belongs to Prasinophyceae and does not have grana in its chloroplast, was studied by immunoelectron microscopy. Two PS I antibodies were used: one against a PS I component of maize, the other against the 60 and 62 KDa PS I reaction centre proteins of the cyanobacterium Synechococcus elongatus. Both antibodies showed that 76-78% of the labelling is on the appressed thylakoid membranes and only 22-24% is located on the unappressed membranes. Use of antiserum against cp-47 of PS II from S. elongatus also gives 76% of the labelling on appressed thylakoid membranes and 24% on unappressed thylakoid membranes. Cytochemical detection of PS I activity by the photooxidation of 3,3$ sp prime$-diaminobenzidine and of PS II activity by the photoreduction of distyryl nitroblue tetrazolium chloride also revealed that PS I and PS II activities exist on both types of thylakoid membranes. Therefore, our results indicate that the distribution of PS I and PS II in green algae may differ from that in higher plants.
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Azevedo, Marcelo José Seabra. "" Single and combined effects of environmental stressors on the marine microalgae Tetraselmis chuii "." Master's thesis, Instituto de Ciências Biomédicas Abel Salazar, 2011. http://hdl.handle.net/10216/56942.

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Azevedo, Marcelo José Seabra. "" Single and combined effects of environmental stressors on the marine microalgae Tetraselmis chuii "." Dissertação, Instituto de Ciências Biomédicas Abel Salazar, 2011. http://hdl.handle.net/10216/56942.

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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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Maguerroski, Kamila dos Santos. "Estudo voltamétrico da adsorção de Cd(II) e Zn(II) na microalga marinha Tetraselmis gracilis." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-30092014-112519/.

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A capacidade de ligação de prótons e metais por células vivas da microalga Tetraselmis gracilis (Kylin) butcher foi estudada por titulação potenciométrica e voltametria de redissolução anódica, respectivamente. Dados da titulação alcalimétrica obtidos com uma suspensão de microalga suspensa em NaCl 0,60 mol L-1 a 25,0 ± 0,1 ºC foram tratados por um modelo de distribuição discreta de sítios baseado na linearização das curvas de titulação por funções de Gran modificadas. A concentração total de sítios ionizáveis foi 3,4 x 10-3 mmol g-1, divididos em quatro classes de grupos com pKa 4,4; 5,2; 7,0 e 9,3, cujas abundâncias relativas foram 13, 5,8, 8,2 e 73%, respectivamente. Ligação de Cd(II) e Zn(II) foi estudada em água do mar (pH 8,2) por adições de soluções dos cátion metálicos em soluções simples ou misturas binárias. O cálculo das concentrações dos metais a partir dos dados voltamétricos considerou o agregado célula-metal tendo difusão muito menor do que a do íon livre. Capacidades de adsorção e o logaritmo das constantes de equilíbrio condicionais foram 7,9 ± 0,9 µmol g-1 e 6,9 ± 0,3 L g-1 para Cd(II) e 18,1 ± 0,4 µmol g-1 e 8,8 ± 0,2 L g-1 para Zn(II). Nas titulações com misturas binárias as capacidades de adsorção foram 0,129 ± 0 ,008 e 18,1 ± 0,4 µmol g-1 de Cd(II) e Zn(II), respectivamente, sugerindo que a ligação de Zn(II) inibe a de Cd(II). Entretanto, mesmo na presença de Zn(II) a superfície de alga possui sítios minoritários que se ligam a Cd(II) (log Kads = 7,7 ± 0,2), o que pode causar a bioacumulação desse íon metálico tóxico.
Proton and metal binding capacities of living cells of the microalgae Tetraselmis gracilis (Kylin) butcher were determined by potentiometric titration and anodic stripping voltammetry, respectively. Data of alkalimetric titration of the microalgae suspension obtained in 0.60 mol L-1 NaCl at 25.0 ± 0.1ºC was treated by a discrete site distribution model based on the linearization of the titration curve by modified Gran functions. A total of 3.4 x 10-3 mmol g-1 ionizable sites were determined, divided in four classes of groups with pKa 4.4, 5.2, 7.0 and 9.3, whose relative abundances were 13, 5.8, 8.2 and 73%, respectively. Binding of Cd(II) and Zn(II) was studied in seawater (pH 8.2) by additions of either single metallic species or binary mixtures. Computation of free metal concentrations from the voltammetric data considered the cell-metal aggregates with diffusion coefficient significantly lower than that of free metal ions. Adsorption capacities and the logarithm of the conditional equilibrium constants were 7.9 ± 0.9 µmol g-1 and 6.9 ± 0.3 L g-1 for Cd(II) and 18.1 ± 0.4 µmol g-1 and 8.8 ± 0.2 L g-1 for Zn(II). For titrations with binary mixtures of Cd(II) and Zn(II ) the adsorption capacity of Cd(II) were 0.129 ± 0.008 µmol g-1 and 18.1 ± 0.4 µmol g-1, respectively. The results suggest that binding of Zn(II) inhibits that of Cd(II). However, even in the presence of Zn(II), the alga surface has some minor sites that can bind Cd(II) (log Kads = 7.7 ± 0.2), a process that can lead to bioaccumulation of this toxic metal ion.
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Chamoumi, Mostafa. "Optimisation de la production du biodiesel à partir d'huiles de microalgues et d'huiles usées." Mémoire, Université de Sherbrooke, 2013. http://hdl.handle.net/11143/6164.

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L'augmentation de la consommation du pétrole, principale source d'énergie fossile actuelle, utilisée en grande partie par le secteur du transport, fera en sorte que ses réserves risquent de diminuer dans le futur. Ainsi, la dépendance des pays consommateurs vis-à-vis des pays producteurs ne fera que s'accentuer. Par ailleurs, les transports sont considérés comme la première source d'émissions de gaz à effet de serre (GES) dont le dioxyde de carbone (CO2), gaz lié aux changements climatiques. Ces facteurs ainsi que l'instabilité des cours du pétrole ont incité les politiques et par conséquent les chercheurs à trouver, de façon urgente, des sources alternatives au pétrole. Le retour au biodiesel initié et utilisé, il y a plus d'un siècle, par Rudolph Diesel (1858-1913), s'avère une des solutions possibles. Ces dernières années, la plupart des biodiesels industriels sont produits à partir de l'huile (triglycérides) extraite de matières premières végétales (colza, tournesol, soja, etc.). Afm de changer leurs propriétés physico-chimiques pour les rendre similaires à celles du pétro-diesel, les triglycérides sont transestérifiés en esters alkyliques d'acides gras, qui peuvent être utilisés dans un moteur classique, sans modification. Sur le plan écologique, en plus de la capacité des plantes oléagineuses à réduire les émissions polluantes de GES en piégeant et en consommant notamment le CO2, l'utilisation du biodiesel réduit les émissions nettes de polluants. Or, une forte demande des plantes oléagineuses comme matières premières pour produire du biodiesel pourrait augmenter le prix des huiles qui sont également nécessaires à l'alimentation humaine. D'autre part, l'utilisation de telles huiles engendre des coûts de production de biodiesel. Afm de surmonter ces problèmes sociaux, économiques et environnementaux, l'utilisation des huiles usées et des microalgues comme matières premières s'avère la solution la plus plausible. Concernant les huiles usées, le rejet de ces résidus graisseux dans le réseau d'assainissement est un risque pour l'environnement et pour les installations de traitement des eaux. Ces huiles gênent le bon fonctionnement des stations d'épuration lorsqu'elles sont rejetées dans le réseau d'assainissement, ce qui entraîne un surcoût. Le déversement de ces huiles provoque de nombreuses nuisances à savoir l'obturation des canalisations, la difficulté de traitement des graisses en station d'épuration, la production d'odeurs nauséabondes et de gaz toxiques, la corrosion des canalisations et le déséquilibre de la faune et de la flore aquatique, d'où l'intérêt de les valoriser en biodiesel. Quant aux microalgues, leur valorisation en biocarburant se développe depuis plusieurs années. Ce sont des microorganismes très anciens et il en existerait au moins 100 000 espèces, dont une cinquantaine seulement sont bien connues parmi les 40 000 déjà étudiées. Il reste donc encore un très grand potentiel à explorer. Ces microorganismes capturent, concentrent et fixent l'énergie de la lumière dans la biomasse. Les procédés de production des microalgues sont variés. Certains d'entre eux permettent d'absorber les émissions de CO2 atmosphérique de divers procédés comme celles issues des cimenteries. La grande capacité des microalgues à épurer les effluents industriels, municipaux ou agricoles, peut aussi être avantageusement exploitée. Les microalgues présentent un potentiel de productivité pouvant dépasser dix fois les meilleures cultures agricoles conventionnelles. La production industrielle de microalgues se présente donc, de plus en plus, comme une solution durable intéressante. Les modes et les procédés de production ont évolué au cours des années. Le mode autotrophe, le plus répandu, développé avec l'énergie salaire, permet de convertir le CO2 en microalgue polyvalente. Les procédés autotrophes les plus étudiés sont constitués de divers types de bassins et de photobioréacteurs (PBR). Par ailleurs, les procédés hétérotrophes utilisent des bioréacteurs fermés alimentés d'effluents riches en hydrates de carbone. Les procédés hétérotrophes, indépendants des conditions climatiques, représentent donc un potentiel d'exploitation intéressant pour les zones nordiques. Le procédé mixotrophe consiste à cultiver des microalgues dans l'obscurité avec un apport de lumière variable au cours du temps. Cette étude entre dans le cadre de la production de biodiesel par valorisation d'une part des huiles de friture usées provenant du restaurant de l'Université de Sherbrooke et des huiles extraites de la microalgue Tetraselims sp. d'autre part. [symboles non conformes]
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Book chapters on the topic "Tetraselmi"

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Douglas, A. E. "Specificity in the Convoluta Roscoffensis/Tetraselmis Symbiosis." In Cell to Cell Signals in Plant, Animal and Microbial Symbiosis, 131–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73154-9_9.

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Okauchi, Masanori, and Kouichi Kawamura. "Optimum medium for large-scale culture of Tetraselmis tetrathele." In Live Food in Aquaculture, 217–22. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-017-2097-7_34.

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Amit, Uttam Kumar Ghosh, Rahul Gautam, Amit Jaiswal, and Siddhartha Pandey. "Phycoremedaition of Dairy Wastewater and Biodiesel Production Using Mairne Microalage Tetraselmis Indica." In Lecture Notes in Mechanical Engineering, 35–42. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4147-4_4.

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Sheets, Elisa B., and David Rhodes. "Determination of DMSP and Other Onium Compounds in Tetraselmis Subcordiformis by Plasma Desorption Mass Spectrometry." In Biological and Environmental Chemistry of DMSP and Related Sulfonium Compounds, 55–63. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0377-0_5.

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Prasetiyo, Ardianto, Sukarni, and Poppy Puspitasari. "The Coats-Redfern Models Kinetics Analysis of Tetraselmis Chuii—Titanium Dioxide Nanoparticle Blend During Combustion Process." In Lecture Notes in Mechanical Engineering, 273–81. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0867-5_33.

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Ronquillo, Jesse D., Jonathan R. Matias, Toshio Saisho, and Shigehisa Yamasaki. "Culture of Tetraselmis tetrathele and its utilization in the hatchery production of different penaeid shrimps in Asia." In Live Food in Aquaculture, 237–44. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-017-2097-7_37.

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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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Samejima, Y., A. Hirano, K. Hon-Nami, S. Kunito, K. Masuda, M. Hasuike, Y. Tsuyuki, and Y. Ogushi. "A marine microalga utilization for a paper: Semi-batch cultivation of Tetraselmis sp. Tt-1 by a tubular bioreactor and the partial substitution of whole kenaf pulp for a paper." In Studies in Surface Science and Catalysis, 649–52. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)80843-4.

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Conference papers on the topic "Tetraselmi"

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RU’YATIN, RU’YATIN. "Pertumbuhan Tetraselmis dan Nannochloropsis pada skala laboratorium." In Seminar Nasional Masyarakat Biodiversitas Indonesia. Masyarakat Biodiversitas Indonesia, 2015. http://dx.doi.org/10.13057/psnmbi/m010221.

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Widiono, Aloon Eko, Sukarni Sukarni, Retno Wulandari, Ardianto Prasetiyo, Heru Suryanto, and Uun Yanuhar. "Pyrolytic thermal decomposition behavior and kinetic parameters of Tetraselmis chuii microalgae." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0013643.

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Govindan, Natanamurugaraj, Pushparani Chadayam, Gaanty Pragas Maniam, Mohd Hasbi Ab Rahim, Ahmad Ziad Sulaiman, and Yusuf Chisti. "Production of lipids by Tetraselmis sp. grown in palm oil mill effluent." In INTERNATIONAL CONFERENCE ON BIOENGINEERING AND TECHNOLOGY (IConBET2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0079106.

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Lv, Yanxia, Zhaoan Chen, Hongbin Lu, Maicun Deng, Song Xue, and Wei Zhang. "Investigation of photoinduced electron transfer based on immobilized Green microalga Tetraselmis subcordiformis photoanode." In 2013 International Conference on Materials for Renewable Energy and Environment (ICMREE). IEEE, 2013. http://dx.doi.org/10.1109/icmree.2013.6893651.

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Prasetiyo, Ardianto, Sukarni Sukarni, Retno Wulandari, Aloon Eko Widiono, Heru Suryanto, and Uun Yanuhar. "Investigation on kinetic parameters during combustion of Tetraselmis chuii microalgae under thermogravimetric analyzer." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0013582.

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Cavalletti, Elena, Daniele Sirico, Lisa Miccio, Vittorio Bianco, Pasquale Memmolo, Angela Sardo, Sergio Balzano, and Pietro Ferraro. "A study on motility of the green microalgae Tetraselmis tracked by digital holography." In 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE, 2022. http://dx.doi.org/10.1109/metrosea55331.2022.9950916.

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Sirico, Daniele, Elena Cavalletti, Lisa Miccio, Vittorio Bianco, Daniele Pirone, Pasquale Memmolo, Angela Sardo, and Pietro Ferraro. "Holographic tracking and imaging of free-swimming Tetraselmis by off-axis holographic microscopy." In 2021 International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE, 2021. http://dx.doi.org/10.1109/metrosea52177.2021.9611576.

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Haryanto, Samuel Andar, and Yano Surya Pradana. "Hydrothermal liquefaction of low-lipid microalgae Tetraselmis chuii: Effect of temperature and reaction time." In 3RD INTERNATIONAL CONFERENCE ON CHEMISTRY, CHEMICAL PROCESS AND ENGINEERING (IC3PE). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0062474.

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Cherif, Maroua, Touria Bounnit, Hareb Al JAbri, and Imen Saadaoui. "Improvement of Omega-3-rich Microalgae Biomass Production to Support Qatar Food Security." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0035.

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Recently, algae have received considerable interest as one of the most promising feedstocks suitable for animal feed production due to their fast growth, less nutrient requirements and their ability to produce primary and secondary metabolites with high-added value. Different strategies were applied to improve both biomass and metabolites productivities aiming to produce highquality biomass with low cost and high nutritional value. Tetraselmis subcoliformis QUCCCM50, a local marine green alga presenting fast growth, high metabolites content and easy to harvest, was selected as a candidate for feed production. Three different stress conditions were applied to enhance its potential to produce high-value products such as Nitrogen or Phosphorus depletion and high salinity of 100ppt. An assessment of the growth properties and biomass productivity was performed during the growth. After 15 days of cultivation using tubular photobioreactors, the biomass was subjected to metabolites characterization and fatty acids methyl ester profiling. Results showed that the three stress conditions present different impacts on biomass productivity and, lipid quantity and quality. Cultivation under 100 ppt led to the highest increase in lipid content. This culture condition led to 25% increase of the omega-3 fatty acids with the appearance of the docosahexaenoic acid (DHA) and a remarkable increase of the alpha-linolenic acid, comparatively to the control. The enrichment of the Tetraselmis subcoliformis’ biomass in terms of omega-3 fatty acids enhance its nutritional value and make it very suitable for animal feed production. The optimized culture conditions obtained from the current study will be applied at large scale to enhance the quality of the biomass towards omega-3 enriched animal feed supplement production, and hence support achieving food security in the State of Qatar.
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Liu, Guangxu, Hongxi Wu, Xueliang Chai, Yanqing Shao, Lihua Hu, Bo Liu, and Jun Fang. "Toxicity Effect of Two Disinfectants on Motility of Two Marine Microalgae, Isochrysis galbana and Tetraselmis chui." In 2011 5th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2011. http://dx.doi.org/10.1109/icbbe.2011.5780161.

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