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Dissertations / Theses on the topic 'Botryococcus braunii'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Ariede, Maíra Bueno. "Aplicação do extrato da microalga Botryococcus braunii em formulações cosméticas fotoprotetoras." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-10022017-151642/.

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Diversos produtos tópicos são desenvolvidos a fim de se evitar os efeitos nocivos da radiação ultravioleta (UV), dentre eles, os protetores solares constituídos por filtros físicos e/ou químicos. No entanto, os filtros químicos podem promover eventos adversos, razão pela qual a busca de ativos em fontes naturais tem-se mostrado de grande importância. A microalga Botryococcus braunii pode ser de potencial interesse em aplicações cosméticas, pois foi descrito que seu extrato aquoso apresentou redução da desidratação cutânea, induziu a produção do colágeno, bem como promoveu atividade antioxidant

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2

Cook, Charlotte. "Sequencing and analysis of the diel transcriptome of Botryococcus braunii." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/17075.

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Microalgae are widely viewed as a potential source of renewable biofuels. Microalgae are highly productive and can be cultured in recycled water on margial or non-agricultural land. Despite their advantages, the industrial scale deployment of microalgae faces numerous challenges including relatively little knowledge of the algae themselves and the comparatively expensive infrastructures required for culture. The green microalga, Botryococcus braunii is particularly interesting because it synthesizes long-chain (C30- C40) hydrocarbons that can be converted to liquid fuel by hydrogenation and ca

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3

Corre, Bernard. "Croissance et production d'hydrocarbures de Botryococcus braunii : influence de divers paramètres physico-chimiques : relations avec les caractéristiques photosynthétiques." Paris 11, 1985. http://www.theses.fr/1985PA112327.

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L'algue verte Botryococcus braunii produit en abondance des hydrocarbures. Ses caractéristiques photosynthétiques (contenu pigmentaire, activité photosynthétique totale et du Photosystème II, émission de fluorescence à basse température) sont étudiées au cours de croissances en milieu non renouvelé. L'activité photosynthétique est maximale au cours de la phase exponentielle, ceci étant corrélé par une diminution de la taille apparente des antennes. Parallèlement, la productivité en hydrocarbures est maximale. Les relations entre les caractéristiques photosynthétiques et les productions de biom

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4

Leproux, Anne. "Etude des polyosides de deux chlorophycées, Botryococcus braunii et Enteromorpha intestinalis." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37599136h.

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5

Leproux, Anne. "Etude des polyosides de deux chlorophycées botryococcus braunii et enteromorpha intestinalis." Paris 6, 1986. http://www.theses.fr/1986PA066119.

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Sur les polyosides pariétaux intestinalis nous avons comparé les rendements de différentes méthodes d'extraction, puis analysé les propriétés chimiques et physiques des polyosides. Une identification des oses neutres constitutifs a été réalisée, après hydrolyse, par CPV et HPLC. Sur les polyosides exocellulaires de botryococcus braunii nous avons examiné l'influence de l'état physiologique de l'algue, de la souche, de l'axenicité de la culture et des conditions de culture sur la teneur du milieu en polyosides. L'analyse chimique, avec identification après hydrolyse par CPV et HPLC des oses con

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6

Dennis, Michael William. "Hydrocarbon biosynthesis : purification and characterization of aldehyde decarbonylase from Botryococcus braunii /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487694389393803.

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7

Mora, Lina Susana Perez. "Avaliação do crescimento de Botryococcus braunii em reator tubular empregando diferentes concentrações de fontes de nitrogênio e fósforo." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/9/9134/tde-06082014-141334/.

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As microalgas são organismos unicelulares, eucariotos, simples em estrutura, fotossintetizantes, que requerem principalmente luz, água e nutrientes inorgânicos para seu crescimento. Estes micro-organismos podem converter eficientemente dióxido de carbono em biomassa e certos compostos bioativos com aplicações nas indústrias alimentícia, farmacêutica e cosmética. Botryococcus braunii é uma espécie de microalga capaz de sintetizar e armazenar lipídios, incluindo ácidos graxos, epóxidos, alquilfenol, éter e hidrocarbonetos de cadeia longa. O conteúdo lipídico pode alcançar de 15% a 75% da biomass

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8

Ruhl, Isaiah Daniel. "High Resolution Magic Angle Spinning NMR Studies of Botryococcus Braunii." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1244008200.

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9

Sadeghin, Bahareh. "Effect of light supply on the hydrocarbon enriched microalga, Botryococcus braunii BOT-22." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4033/document.

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Botryococcus braunii Bot-22 a été cultivée dans un photobioréacteur plat dans des conditions photoautotrophiques continues. Deux densités de flux de photons (PFD) de 50 et 500 μmol quanta m-2 s-1, deux taux de dilution de 0.178 et 0.357 d-1, trois concentrations différentes d'oxygène dissous et deux périodes de exposition à la lumière ont été appliquées pour produire de différentes productions de biomasse et 'd'hydrocarbures et de profil d’acides gras. L'augmentation de dix fois du PAR-PFD appliqué sur la surface du photobioréacteur induit une augmentation transitoire du rEX, avant d'atteindre

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10

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 foun

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11

Jin, Jian. "Kinetic study of biomass and hydrocarbon production in chemostat cultures of the microalga Botryococcus braunii : a physiological approach." Nantes, 2016. http://archive.bu.univ-nantes.fr/pollux/show.action?id=0625ba31-c1a0-4960-9b0d-cf94f96fcd99.

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L'espèce Botryococcus braunii a la propriété d'accumuler des quantités importantes d'hydrocarbures à longue chaîne. L’objectif est d'étudier les effets de variables opératoires en photobioréacteur sur les productivités en biomasse et hydrocarbures de cultures continues de deux souches de B. Braunii, l’une de race A et l’autre de race B accumulant respectivement soit des alkadiènes et alkatriènes soit des botryococcènes. Les deux principaux hydrocarbures contenus dans la biomasse de la souche de race A SAG 30. 81, sont identifiés comme étant le nonacosadiene et l’hentriacontadiene. L’analyse d’

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12

Villarreal-Rosales, Eduardo. "Étude biochimique d'une souche de Botryococcus braunii produisant en abondance des éthers alcools à longue chaîne." Compiègne, 1990. http://www.theses.fr/1990COMPD250.

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Nous avons étudié une nouvelle souche de la microalgue riche en lipides Botryococcus braunii. Aucune différence morphologique ou structurale ne distingue la nouvelle souche originaire de Coat-ar-Herno, France, des autres souches déjà a décrites. La nature des hydrocarbures qu'elle produit (alcadiènes et triènes) a conduit à la rattacher à la race A de B. Braunii. Cette souche synthétise en abondance (jusqu'à 32% de la matière sèche) un éther-alcool. On a montre que cet éther-alcool ne résulte pas d'une oxidation non biologique et que les bactéries contaminantes ne sont pas à l'origine de sa fo

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13

Jones, Katy June. "Bioinformatic analysis of biotechnologically important microbial communities." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34543.

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Difficulties associated with the study of microbial communities, such as low proportions of cultivable species, have been addressed in recent years with the advent of a range of sequencing technologies and bioinformatic tools. This is enabling previously unexplored communities to be characterised and utilised in a range of biotechnology applications. In this thesis bioinformatic methods were applied to two datasets of biotechnological interest: microbial communities found living with the oil-producing alga Botryococcus braunii and microbial communities in acid mine drainage (AMD). B. braunii i

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14

Tennant, Richard Kenneth. "Genomic analysis of microfossils in lake sediments." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/20649.

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Botryococcus braunii is a microscopic, colonial green alga that may be found in fresh and brackish waters throughout the globe. B. braunii is unique in that it constitutively synthesises and secretes copious amounts of various long-chain (C23-C40) hydrocarbons, generically termed “botryococcenes”. Botryococcanes, the hydrogenated forms of botryococcenes, comprise 1% of the fossil hydrocarbons found in petroleum deposits and in oil-shales. Microfossils identified as Botryococcus by optical and scanning electron microscopy are also abundant in these strata, but the actual identity and precise re

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15

Chaudhari, Swapnil [Verfasser], Olaf [Akademischer Betreuer] Kruse, and Karsten [Akademischer Betreuer] Niehaus. "Systematic metabolic characterization of hydrocarbon and exo-polysaccharide producing microalga Botryococcus braunii / Swapnil Chaudhari ; Olaf Kruse, Karsten Niehaus." Bielefeld : Universitätsbibliothek Bielefeld, 2018. http://d-nb.info/1155302745/34.

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16

Niehaus, Thomas Daniel. "ELUCIDATING THE BIOCHEMICAL WIZARDRY OF TRITERPENE METABOLISM IN BOTROYCOCCUS BRAUNII." UKnowledge, 2011. http://uknowledge.uky.edu/pss_etds/1.

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B. braunii is a green alga that has attracted attention as a potential renewable fuel source due to its high oil content and the archeological record of its unique contribution to oil and coal shales. Three extant chemotypes of B. braunii have been described, namely race A, race B, and race L, which accumulate alkadienes and alkatrienes, botryococcene and squalene and their methylated derivatives, and lycopadiene, respectively. The methylated triterpenes, particularly botryococcenes, produced by race B can be efficiently converted to high quality combustible fuels and other petrochemicals; how

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17

Derenne, Sylvie. "Etude structurale de biopolymères résistants isolés de l'algue actuelle Botryococcus braunii et de leurs analogues fossiles implications géochimiques, formation de kérogènes par préservation sélective /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613076j.

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18

Derenne, Sylvie. "Etude structurale de biopolymeres resistants isoles de l'algue actuelle botryococcus braunii et de leurs analogues fossiles : implications geochimiques, formation de kerogenes par preservation selective." Paris 6, 1988. http://www.theses.fr/1988PA066194.

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On s'interesse aux torbanites, kerogenes algaires a haut potentiel petroligene, constitues des restes fossiles d'une algue coloniale botryococcus braunii. On montre que la structure d'une torbanite immature est analogue a celle d'un biopolymere resistant aux attaques chimiques qu'on peut isoler des parois de l'algue actuelle: ainsi, ces kerogenes se formeraient par un mecanisme de preservation selective d'un constituant initial de la biomasse. On met en evidence les modifications structurales accompagnant l'evolution d'une torbanite. On etudie les premiers stades de la fossilisation de botryoc

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19

Molnar, Istvan, David Lopez, Jennifer Wisecaver, et al. "Bio-crude transcriptomics: Gene discovery and metabolic network reconstruction for the biosynthesis of the terpenome of the hydrocarbon oil-producing green alga, Botryococcus braunii race B (Showa)*." BioMed Central, 2012. http://hdl.handle.net/10150/610020.

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BACKGROUND:Microalgae hold promise for yielding a biofuel feedstock that is sustainable, carbon-neutral, distributed, and only minimally disruptive for the production of food and feed by traditional agriculture. Amongst oleaginous eukaryotic algae, the B race of Botryococcus braunii is unique in that it produces large amounts of liquid hydrocarbons of terpenoid origin. These are comparable to fossil crude oil, and are sequestered outside the cells in a communal extracellular polymeric matrix material. Biosynthetic engineering of terpenoid bio-crude production requires identification of genes a

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20

Salmon, Élodie. "Étude des mécanismes du craquage thermique par simulation dynamique moléculaire de géopolymères organiques avec un champ de force réactif (ReaxFF)." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL003N/document.

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Le kérogène, fraction insoluble de la matière organique sédimentaire, est un mélange complexe et hétérogène de macromolécules organiques. Ces structures évoluent, essentiellement sous l’effet de la température, au cours des temps géologiques et génèrent les hydrocarbures présents dans les bassins sédimentaires. Comprendre et quantifier les mécanismes physicochimiques associés à ce processus est important pour l’estimation des réserves pétrolières. Au cours de cette étude, deux géopolymères ont été sélectionnés pour représenter la décomposition thermique de structures typiques des kérogènes nat

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21

Templier, Joëlle. "Hydrocarbures non terpeniques de la microalgue botryococcus braunii. Voie de biosynthese et specificite du systeme enzymatique d'elongation-decarboxylation. Relation biosynthetique avec les autres lipides a tres longue chaine. Participation dans la formaiton de macromolecules parietales chimiquement resistantes." Paris 6, 1991. http://www.theses.fr/1991PA066358.

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L'algue b. Braunii de race a produit d'importantes quantites d'hydrocarbures non terpeniques, principalement une serie de dienes impairs de c#2#5 a c#3#1, et des trienes c#2#9 et c#3#1 possedant tous une double liaison #9, cis, et une double liaison terminale. Ces hydrocarbures sont formes par elongation-decarboxylation du precurseur direct: l'acide oleique (c#1#8#:#19,cis). L'etude de cette voie de biosynthese a montre que le systeme enzymatique d'elongation-decarboxylation n'est pas specifique de la stereochimie de la double liaison #9 du precurseur, mais qu'il n'accepte pas de prendre en ch

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22

Chiang, Yin-Ru, and 江殷儒. "The biotoxicity of metabolites of Botryococcus braunii from Lake Li-Yu." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/76407683197535233801.

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碩士<br>國立臺灣大學<br>植物學研究所<br>90<br>With a surface area of ca. 100 ha, the Lake Li-Yu is the largest lake in Hwa-Lian county, Taiwan. It is an eutrophic lake with Botryococcus braunii blooms occurred in autumn and winter in the years of 1993, 1996 and 1999. Death of fish, mainly Tilapia, were observed in the lake during B. braunii blooming. In order to elucidate the effects of algal blooms in this aquatic ecosystem, the toxicity of B. braunii was studied. Fifteen strains of phytoplankton were isolated from the lake and the cultures were tested for the toxicity of B. braunii extract on them. Result

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23

Weiss, Taylor Leigh. "Molecular and Biochemical Characterization of Hydrocarbon Production in the Green Microalga Botryococcus braunii." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11651.

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Botryococcus braunii (Chlorophyta, Botryococcaceae) is a colony-forming green microalga that produces large amounts of liquid hydrocarbons, which can be converted into transportation fuels. While B. braunii has been well studied for the chemistry of the hydrocarbon production, very little is known about the molecular biology of B. braunii. As such, this study developed both apparatus and techniques to culture B. braunii for use in the genetic and biochemical characterization. During genetic studies, the genome size was determined of a representative strain of each of the three races of B. br

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24

Wang, Zi-Yue, and 王姿月. "Investigation of the growth characteristic of the oil-producing algae Botryococcus braunii and Chlorella vulgaris." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/33252819175739574118.

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25

Lin, Ya-Chi, and 林雅琦. "Oil Production and Composition, and Biomass of Botryococcus braunii Cultured under Different Light Intensities and Nitrogen Concentrations." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77929366678286108261.

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碩士<br>國立臺灣海洋大學<br>水產養殖學系<br>101<br>Botryococcus braunii is a microalga that can produce a great quantity of hydrocarbon. It has been regarded as a potential and renewable energy resource, that attracting a lot of studies in this field. The present study tried to analysis the effects on biomass as well as oil content and composition in varied light intensities and concentrations of nitrogen. Consequently, obtained the best factors for B. braunii secrete oil for producing bio-energy. In addition, the biomass and oil contents of B. braunii (fatty acid compositions and quantity of hydrocarbon) wer

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