Dissertations / Theses on the topic 'Fixation CO2'
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Paoli, George Carl. "Organization and regulation of the Rhodobacter capsulatus CO2 fixation genes /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487943610782543.
Castro, Gómez Fernando Simón. "Theoretical studies on transition metal catalyzed carbon dioxide fixation." Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/403368.
Se han llevado a cabo estudios teóricos con el fin de evaluar mecanismos de reacción para procesos de fijación de CO2 catalizados por complejos de metales de transición. De este modo, se describieron detalladamente los pasos del mecanismo de reacción (reacciones de apertura de anillo, de inserción de CO2 y de cierre de anillo) para la formación catalítica de carbonatos cíclicos a partir de CO2 y diferentes epóxidos, basada en complejos de Zn(salen), conjuntamente con NBu4X (X = I, Br). Se encontró que las energías de activación DFT calculadas están de manera cualitativa en línea con los resultados experimentales. Por otra parte, se consideró un catalizador de aluminio altamente activo para estudiar la misma reacción, pero desde un punto de vista cuantitativo. Así pues, se examinó la actividad del sistema catalizador mediante el cálculo teórico de las frecuencias de repetición (TOFs). Estas últimas resultaron en el mismo orden de magnitud que los experimentos. El último de los mecanismos estudiados aquí involucra la reacción de copolimerización entre CO2 y óxido de ciclohexeno catalizada por el sistema binario compuesto por dicho complejo de aluminio y NBu4I. Se encontraron tres posibles rutas para describir la reacción dependiendo el número de catalizadores involucrados en la reacción de propagación. Los resultados sugieren que la copolimerización alternada es más favorable con respecto a la formación del carbonato cíclico. Además de los estudios anteriores, se usaron métodos de espectrometría de masas de movilidad iónica (IM-MS) para proporcionar información estructural sobre una serie de complejos de metales de transición involucrados en catálisis homogénea. Se determinaron las secciones eficaces de colisión (CCS) teóricas y se compararon con las resultantes de los experimentos IM-MS. Se encontró un excelente acuerdo entre el resultado de ambas metodologías.
Theoretical studies have been conducted in order to evaluate reaction mechanisms for CO2 fixation processes catalyzed by transition metal complexes. Thus, detailed mechanistic steps (ring-opening, CO2 insertion and ring-closing reactions) were described for the catalytic formation of cyclic carbonates from CO2 and a series of epoxides based on Zn(salen) complexes, in conjunction with NBu4X(X=I, Br). The computed DFT activation energies were found to be qualitatively in line with the experimental findings. Moreover, a highly active Al catalyst (derived from amino triphenolate ligands) was considered to study the same reaction, but from a quantitative point of view. In light of this, the activity of this catalyst system was examined by means of the theoretical calculation of frequencies (TOFs). The latter resulted in the same order of magnitude as the experiments. The last mechanism studied here comprises the copolymerization reaction between CO2 and cyclohexene oxide mediated by the binary system composed of the aforementioned Al complex species and NBu4I. Three possible pathways were found to describe the reaction depending on the number of Al complexes involved in the propagation step. Results suggest that the alternating copolymerization should be the most favorable pathway over the formation of the five-membered cyclic carbonate product. In addition to the above studies, methods of ion mobility mass spectrometry (IM-MS) have been employed to provide structural information on a series of transition metal complexes involved in homogeneous catalysis. Theoretical collision cross sections (CCSs) were determined and compared with those resulting from IM-MS experiments. The outcome from both methodologies yielded excellent agreement.
Spona-Friedl, Marina [Verfasser]. "Substrate dependent heterotrophic CO2-fixation as indicator for metabolic phenotypes / Marina Spona-Friedl." Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1219903590/34.
Cozzolino, Mariachiara. "CO2 fixation in cyclic carbonates and polycarbonates by salen-like based metal complexes." Doctoral thesis, Universita degli studi di Salerno, 2019. http://elea.unisa.it:8080/xmlui/handle/10556/4254.
At the current rate of consumption of petroleum resources, they are predicted to be exhausted within the next century. For this reason, the development of new chemical processes using biorenewable resources is attracting an increasing interest... [edited by Author]
XXXI ciclo
Preiner, Martina [Verfasser], William [Gutachter] Martin, and Michael [Gutachter] Schmitt. "The abiotic pattern of biotic CO2 fixation / Martina Preiner ; Gutachter: William Martin, Michael Schmitt." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2020. http://d-nb.info/1206414278/34.
Yoshida, Shosuke. "Engineering of a Type III Rubisco from a Hyperthermophilic Archaeon Aimed to Enhance Catalytic Performance at Ambient Temperatures." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/57249.
0048
新制・課程博士
博士(工学)
甲第13793号
工博第2897号
新制||工||1428(附属図書館)
26009
UT51-2008-C709
京都大学大学院工学研究科合成・生物化学専攻
(主査)教授 今中 忠行, 教授 青山 安宏, 教授 濵地 格
学位規則第4条第1項該当
Kirstetter, Anne-Sophie. "Etude de la fixation du carbone inorganique chez la levure pour la production industrielle de molécules d’intérêt." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC015/document.
White biotechnologies have been developing quickly during the last decades, aiming at replacing chemical syntheses by biological processes for the industrial production of target compounds. In this context, the implementation of anaplerotic reactions in the metabolism is of great interest, since those reactions allow both production of dicarboxylic acids and direct fixation of inorganic carbon. This work is about the development of a metabolic engineering strategy using inorganic carbon fixation reactions to produce malic acid, a compound with various industrial applications. The yeast Saccharomyces cerevisiae was chosen as a host for its convenient use in industrial processes and the availability of genetic tools. The approach developed to produce malic acid is based on the overexpression of Escherichia coli phosphoenolpyruvate carboxylase (PEPC), S. cerevisiae peroxysomale malate dehydrogenase relocated in the cytosol (MDH) and Schizosaccharomyces pombe dicarboxylic acid carrier. A recombinant yeast strain expressing those three genes was obtained and characterised in shake-flasks experiments, involving more specifically calcium carbonate as an inorganic carbon source. Those experiments showed an enhancement of the malate production in the presence of calcium carbonate and allowed to obtain a concentration of 2.5 g/L from 50 g/L glucose, for a maximal yield of 0.046 gram malate per gram glucose. Fermentation experiments were performed in a 5 L bioreactor in the presence of air or 5% CO2 enriched air; they confirmed the positive effect of inorganic carbon addition as CO2 on malate production. A malate concentration of 1.46 g/L from 50 g/L glucose was obtained, giving a yield of 0.029 gram malate per gram glucose. Intermediate recombinant strains expressing PEPC and MDH were also characterised, for ethanol production, as they seemed to give increased ethanol yields, probably due to a transhydrogenase effect. Shake flasks and bioreactors experiments did unfortunately not confirm the yield improvement
Joshi, Gauri Suresh. "Regulation of CO2 fixation in Rhodopseudomonas palustris mediated by a unique two-component regulatory system." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1273605616.
Garcia, Susana. "Experimental and simulation studies of iron oxides for geochemical fixation of CO2-SO2 gas mixtures." Thesis, University of Nottingham, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523076.
Carrillo, Camacho Martina [Verfasser], and Tobias J. [Akademischer Betreuer] Erb. "Implementation of CO2 fixation pathways into Methylorubrum extorquens AM1 / Martina Carrillo Camacho ; Betreuer: Tobias J. Erb." Marburg : Philipps-Universität Marburg, 2021. http://d-nb.info/1229619917/34.
Al, Ketife Ahmed Majeed Daife. "Modelling and Optimization of Combined Wastewater Treatment and CO2 Bio-fixation in a Batch Algal Photobioreactor." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/59696.
Abreu, Carlos Eduardo Aragón. "Physiological characteristics as analyzed by hormone profile, metabolic pathways and expression of specific induced genes of C3, C4 and CAM tropical crops propagated by Temporary Immersion Bioreactors (TIB)." Doctoral thesis, ISA/UL, 2015. http://hdl.handle.net/10400.5/9264.
Physiology and biochemistry of in vitro plants can be complex and different when compared with conventional and well known plant ex vitro behavior. Metabolic reprogramming events that occur in a number of in vitro propagated plant species give rise to low ex vitro yields as a handicap for commercial application. Temporary Immersion Bioreactors (TIB) are a method to obtain plantlet morphology and physiology much alike that of in vivo grown plants. Three tropical crops were selected for their economic importance, but also because of their different photosynthetic characteristics, to compare C4 (sugarcane) and C3-CAM (pineapple) facultative photosynthetic pathways to the more common C3-type (plantain) photosynthesis. Experiments performed using plantain and sugarcane allowed to integrate the results obtained when monitoring the oxidative stress response in C3 and C4 metabolism. Pineapple plants propagated in TIB and evaluated during acclimatization under C3 and CAM inducing conditions were used to describe the facultative C3-CAM carbon metabolism and the influence of the environmental conditions on the switch from C3 to CAM. Studies based on the modulation of in vitro conditions which reproduce abiotic stress conditions can be used for understanding the influence of upcoming climate changes on the physiology of different species
FCT
Meakin, Nicholas G. "Metagenomic analyses of marine new production under elevated CO2 conditions." Thesis, University of Stirling, 2009. http://hdl.handle.net/1893/1555.
Ewe, Daniela [Verfasser]. "Living well with a scrambled metabolism : CO2 fixation and carbohydrate pathways in the diatom Phaeodactylum tricornutum / Daniela Ewe." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/1112604375/34.
Aguiar, Kelen Menezes Flores Rossi de. "Síntese de hidroxiuretana-poli(dimetilsiloxano) com diferentes terminações de cadeia via fixação de CO2: síntese, caracterizações e potenciais aplicações." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-26102015-114419/.
Free isocyanate urethanes produced from an oligomeric precursor bis(cyclic carbonate) bearing poly(dimethylsiloxane) (CCPDMS) were synthesized in this work. Different primary amines such as 3-Aminomethyl-3,5,5-trimethylcyclohexylamine (IPDA) and monoamines 3-aminopropyltriethoxysilane (APTES), phenylethylamine (PEA), catechol amine (dopamine) and a decapeptide derived from marine mussel foot protein (mefp-1). The precursor cyclic carbonate CCPDMS was obtained from carbon dioxide fixation into epoxy rings catalized by a quaternary ammonium salt, tetraethylamonium bromide (TEAB). The precursor CCPDMS was reacted with the different amines by ring opening polymerization affording the formation of hydroxyurethanes PDMS derived (PDMSUr) with different chain terminations. Using APTES as chain terminator was feasible to obtain a hybrid material containing inorganic domains of organically modified silica (ormosil) interconnected to the organic part PDMS through urethane bond. In this hybrid matrix different mass percentages, varying from 1%wt to 55 wt%, of phosphotungstic acid (PWA) were added. The materials were characterized regarding their chemical structure by spectroscopic techniques (Nuclear Magnetic Resonance, Infrared, and X-ray photoelectron spectroscopy), mass spectrometry (MALDI-ToF and GPC), anti corrosive property (Electrochemical Impedance Spectroscopy and potentiodynamic polarization), surface properties (free surface energy, nanoindentation), morphology (Scanning Electron Microscopy), thermal stability (Thermogravimetric analysis), adhesion strenght measurements (pull-off-test and lap-shear), microbiologic assays (bacteria adhesion, tissue adhesion and citotoxicity test) besides photochromic assays. The polyoxometalate PWA provided photochromic property to the PDMSUr hybrid films presenting a maximum absorbance of 1.6 a.u after ultraviolet (UV) irradiation. Hybrids PDMSUr with or without PWA were tested as adhesive for glass, aluminium, steel (SS316L) and titanium alloy (Ti6Al4V) showing adhesion strength values ranging from 2-7 MPa. PDMSUr films prepared on different substrates showed bacteriostatic behavior against Escherichia coli (E.coli) and Lactobacillus casei (L.casei). The biomimetic PDMSUr catechol endcapped was able to form a layer on metallic surfaces showing good stability after rinsing with ethanol.
Temperton, Victoria Martine. "The effects of nitrogen uptake and nitrogen fixation on trees grown in elevated [CO2] : Alnus glutinosa and Pinus sylvestris." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/13101.
Mangiapia, Mary Ann. "From CO2 to Cell: Energetic Expense of Creating Biomass Using the Calvin-Benson-Bassham and Reductive Citric Acid Cycles Based on Genomic Data." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5264.
Nogueira, Rodrigo Bíscaro. "Obtenção e caracterização de poliuretanos sem o uso de isocianatos (NIPU) e com fixação de CO2." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-24032011-090501/.
Seeking to optimize the formation of ciclocarbonates, it was developed a reactor in a closed system (no atmospheric emissions of CO2) in which the parameters of synthesis could be controlled: CO2 pressure, temperature of the reaction medium, distribution and concentration of CO2 gas bubbles in epoxy resin. The development of the ciclocarbonate synthesis\'s reactor included new systems to improve the gas-liquid contact between the reactants (aerator and CO2 reflux system) and also a heating system using microwave radiation. It were synthesized in this research, the co-catalyst (zinc resinate), the ciclocarbonate under different conditions of: pressure, temperature, synthesis time, heating source, aeration and catalyst, and \"green\" polyurethanes by an alternative route instead of the use of isocyanates, which have potential in specific applications (control of properties through chemical structure of the polymer). The result of the carbonates formation reaction was analyzed by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (RMN) to obtain the carbonates\'s chemical structure\'s, yield and the reaction\'s by-products. Non-isocyanate polyurethanes (NIPU) were obtained from a manufacturing process and secure using CO2 as an input. The characterization of the chemical structure and the yield and by-product\'s analysis of the polyurethanes formation reaction also happened by FTIR and RMN.
Alves, Átila Nascimento. "CO2 como matéria prima: materiais híbridos do tipo uretanosil obtidos a partir de monômeros de poli(dimetil siloxano) e bisfenol A." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-23102018-160019/.
Flexible and film-forming dielectric materials are essential for the production of various technological devices, such as Organic Light Emitting Diodes (OLED), Field Effect Transistors (FETs) or organic photovoltaics (OPVs). Within this context, it is important to highlight the effort to develop more sustainable synthetic routes based on raw materials and more environmentally friendly processes. In the Group of Chemistry of Hybrid and Inorganic Materials (GQMATHI) more than ten years ago, synthetic routes for preparation of oligomers and polymers of urethanes using CO2 as raw material have been investigated. Thus, materials classified as polyhydroxy urethanes, which are obtained from the bis-cyclocarbonate monomer of polydimethylsiloxane (CCPDMS) are synthesized by the Ring Oppening Polymerization (ROP) reaction. The monomer is obtained by the cycloaddition reaction of CO2 in its respective epoxide: poly (dimethylsiloxane) diglycidyl ether (PDMS). In this project the hydroxy urethane materials were synthesized, using two different types of precursor monomer : the CCPDMS and bisphenol A diglycidyl ether cyclocarbonate (CCDGEBA). The oligomer formed was tested in different ratios of these two cyclocarbonates in the reaction against a diamine (5-Amino-1,3,3-trimethylcyclohexanemethylamine (IFDA)). The aminopropyltriethoxysilane (APTS) was used as the chain terminator group. After the synthesis of the cyclocarbonates, characterizations were made by vibrational spectroscopy (IR) and nuclear magnetic resonance (NMR) of 13C and 1H. The successful formation of the cyclocarbonate was confirmed by the 1790 cm-1 peak in the vibrational spectroscum as well as by the dublet near 4.5 ppm (1H NMR) and the singlet at 154 ppm (13 C NMR). The oligomeric hydroxyurethane synthesized from the cyclocarbonates reaction with IFDA and APTS was characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic-mechanical analysis (DMA) and films were prepared by spin coating. The electrical characterization of the films was made by impedance spectroscopy, aiming to evaluate its application on organic FET´s as adielectric layer . In order to improve the performance of the hydroxy urethane material for this application, titanium dioxide (dielectric constant (ε) ≈ 100) was incorporated into the oligomer matrix, thus an hybrid nanocomposite material was formed. The impedance chacacterization of the hybrid was performed showing higher dielectric constant for this new material, although observed a higher dielectric loss, 9 vs 0,2 ,respectively for the hydroxyurethane and the hybrid.
González, Fabra Joan. "Computational Design of Catalysts for Carbon Dioxide Recycling." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/664728.
La utilización del dióxido de carbono como sustrato se ha convertido en una popular estrategia desde una perspectiva ambiental y económica para mitigar las emisiones de CO2 a la atmósfera y, al mismo tiempo, reducir la dependencia del petróleo para proporcionar sustratos con carbono. La activación del dióxido de carbono es un proceso complicado debido a su estabilidad. El diseño de nuevos catalizadores es una tarea compleja que requiere la combinación de técnicas experimentales y teóricas. Una de estas es la modelización molecular, que permite describir detalladamente el sistema y comprender cómo se comporta, o cómo tiene lugar un mecanismo de reacción. La combinación de dos factores, como el aumento de la potencia computacional y la mejora de la eficiencia de los algoritmos, nos permite estudiar grandes sistemas con un nivel razonable de precisión, imitar las condiciones experimentales y, en consecuencia, obtener información crucial. En esta Tesis estudiamos computacionalmente varias reacciones en las que se usa dióxido de carbono como sustrato. Describimos detalladamente el mecanismo de reacción teniendo en cuenta los resultados experimentales proporcionados por nuestros colaboradores. Nuestros resultados contribuyen a comprender mejor cómo funcionan las reacciones de fijación de CO2 y, en consecuencia, puede ayudar en el diseño racional de nuevos y más activos catalizadores para reacciones que involucran CO2 o sustratos similares.
The utilization of carbon dioxide as chemical substrate has become a popular strategy from an environmental and economic perspective to mitigate CO2 emissions to the atmosphere and, at the same time, reduce the petroleum dependency to provide carbon based substrates. The activation of carbon dioxide is not a straightforward process. The design of new catalysts is a complex task that requires the combination of several experimental and theoretical techniques. One of the most relevant is molecular modelling, which allow to describe the system in detail and to understand how the system behaves or how a reaction mechanism takes place. Nowadays, the combination of two factors, being the increase of the computational power and the improved efficiency of the theoretical algorithms, enable computational chemists to study large systems at a reasonable level of accuracy, to mimic the experimental conditions, and consequently, obtain crucial information on the studied system. In this Thesis we studied computationally several reactions where carbon dioxide was used as substrate. We described in detail the reaction mechanism for all cases, taking into consideration the experimental results provided by our collaborators. The results collected in this Thesis contribute to understand better how important CO2 fixation reactions work and consequently, these results may help in the rational design of new and more active catalysts for this type of reactions involving CO2 or substrates of similar properties.
Filali, Rayen. "Estimation et commande robustes de culture de microalgues pour la valorisation biologique de CO2." Phd thesis, Supélec, 2012. http://tel.archives-ouvertes.fr/tel-00765421.
Vincent, Marine. "Ingénierie métabolique de cyanobactéries pour la production photosynthétique de terpènes." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASL158.
Cyanobacteria can produce compounds of industrial interest, from solar energy, water (even polluted) and CO₂. In the laboratory we are interested in terpenes because they are volatile (easy to harvest), have good smells ("cosmetic interest") and a high energy density ("biofuel interest").Our approach takes advantage of the physiological diversity of cyanobacteria and the chemical diversity of terpenes with the future objective of generating economically viable production. Thus, I worked with two different model cyanobacteria, Synechocystis PCC 6803 (S.6803) and Synechococcus PCC 7002 (S.7002), which are capable of growing in salt water (more abundant than fresh water). We have constructed genetically stable terpene producing strains. We have shown, for the first time, that S.6803 can produce farnesene, and also santalene (never produced by a cyanobacterium before (Blanc-Garin et al., 2022), and that S.7002 can produce farnesene (Chenebault et al., 2023). In these two cyanobacteria, the production of terpenes increases in parallel with the expression of genes (ts) coding for terpene synthases (Blanc-Garin et al., 2022; Chenebault et al., 2023). The production of terpenes in S.6803 cultivated in nitrate (the classic nitrogen source) or in urea (less expensive) is equivalent. On the other hand, in S.7002, the production of terpenes is better with urea (Blanc-Garin et al., 2022; Chenebault et al., 2023).As S.6803 produces farnesene better than other terpenes (and better than S.7002), and S.7002 produces limonene better than S.6803 (Chenebault et al., 2023), we worked to improve these producers. I analyzed the influence of carbon fixation, distribution and/or storage on terpene production. Overexpression of the genes encoding RuBisCO and phosphoribulokinase increased the production of farnesene in S.6803, but not limonene in S.7002 (manuscript in preparation). On the other hand, farnesene production in S.6803 does not increase when trying to save carbon, by interrupting the synthesis of polyhydroxybutyrates or by interfering with the synthesis of carotenoids. Partly consistent with our expectation, I showed that overexpression in S.7002 of the crtE gene from S.6803 (crtE₆₈₀₃), but not crtE₇₀₀₂, increases farnesene production (manuscript in preparation). On the other hand, in S.6803, the overexpression of crtE₆₈₀₃ or crtE₇₀₀₂ does not increase the production of farnesene or limonene. All of these results validate the interest in taking into account the biological diversity of cyanobacteria, and the chemical diversity of terpenes, to generate good producers.To prevent genetically modified cyanobacteria (GMO) from escaping from their bioreactors, we verified in S.6803 that the deletion of the ccmK3 and ccmK4 genes involved in the assembly of the carboxysome, generates strains unable of growing in conditions of low CO₂ content which reigns in natural environments. These ∆ccmK3-ccmK4 mutants retain the capacity to produce limonene (low production and therefore not very "greedy" in CO₂). On the other hand, they produce farnesene less efficiently than the wild type strain (manuscript in preparation).Finally, with the ultimate goal of producing terpenes without using nitrate or urea, I worked with two cyanobacteria capable of using atmospheric N₂: Cyanothece PCC 7822 (C.7822) and Gloeothece PCC 6909 (G .6909). I established an efficient conjugation protocol for G.6909 which allowed me to introduce our terpene-producing plasmids (productions are low). On the other hand, C.7822 proved to be refractory to conjugation
Fan, Li. "Novel investigations of sulfimide systems." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8027.
Mota, Cadenas César. "Fijación de CO2 en cultivos y sus implicaciones en el cambio climático." Doctoral thesis, Universidad de Murcia, 2011. http://hdl.handle.net/10803/38711.
CO2 is a variable key that affects both development and the plant physiology, so that the increases resulting from climate change will affect crop growth. Many of the observed physiological responses to increased CO2 in front are influenced by its interaction with other stresses, such as salinity, due to the increasing of the areas affected by the salinity and its impact on the vegetation. Therefore, in this thesis agriculture is exposed as a very important place in the fight against climate change due to its role as kidnappers of atmospheric CO2. The conclusions of this work help clarify what is essential to choose the best solutions effective in this area along with other issues given in our crop lands such as salt stress, which will be implemented by the climate change
Finn, Michael W. "Discovery of a biochemical pathway to generate ribulose 1,5-bisphosphate and subsequent CO2 fixation through ribulose carboxylase/oxygenase (rubisCO) in Methanococcus jannaschii." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1077915999.
Title from first page of PDF file. Document formatted into pages; contains xiii, 149 p.; also includes graphics. Includes abstract and vita. Advisor: F. Robert Tabita, Dept. of Microbiology. Includes bibliographical references (p. 144-149).
Bringuier, Charline. "Effet des changements climatiques et atmosphériques sur la croissance et la fixation biologique de l'azote chez Anabaena variabilis : importance des disponibilités du molybdène et du phosphore." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8790.
Sporre, Emil. "Identification of metabolite-protein interactions among enzymes of the Calvin Cycle in a CO2-fixing bacterium." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278729.
Calvin-Benson-cykeln är den mest utbredda metaboliska processen i naturen med vilken det är möjligt att fixera CO2 och en måltavla av högsta intresse för bioteknologer världen över. I den här studien testades 12 metaboliter (ATP, AMP, NADP, NADPH, 2PG, 3PGA, FBP, RuBP, PEP, AKG, Ac-CoA and phenylalanine) för interaktioner mot proteomet från Cupriavidus necator (tidigare Ralstonia eutropha) i hopp om att hitta potentiella exempel på allosterisk reglering av Calvin-Benson-cykeln. Detta uppnåddes genom användning av LiP-SMap-metoden, en nyligen utvecklad proteomikmetod beskriven av Piazza et al. kapabel av att testa en metabolit av intresse mot en organisms hela proteom simultant. Ett funktionellt protokoll utvecklades och 234 interaktioner mellan ATP och proteomet av C. necator identifierades, varav 103 potentiellt är nyupptäckta. På grund av tidsbrist och motgångar i labbet producerades inga signifikanta resultat för de resterande 11 metaboliterna som testades. C. necator är en industriellt relevant kemolitoautotrof som kan växa på CO2 och vätgas, samt manipuleras till att producera många värdefulla produkter. Bakterierna odlades i kemostater varefter proteomet extraherades i sitt naturliga tillstånd. Sedan inkuberades proteomet med en metabolit av intresse och utsattes för begränsad, icke-specifik proteolys. Den resulterande peptidblandningen analyserades via tandem masspektrometri kopplad till vätskekromatografi (LC – MS/MS).
Sakuragi, Hiroshi. "Studies on applications of Clostridium species for biorefinery." Master's thesis, Kyoto University, 2014. http://hdl.handle.net/2433/188770.
0048
新制・課程博士
博士(農学)
甲第18332号
農博第2057号
新制||農||1023(附属図書館)
学位論文||H26||N4839(農学部図書室)
31190
京都大学大学院農学研究科応用生命科学専攻
(主査)教授 植田 充美, 教授 渡邊 隆司, 教授 梅澤 俊明
学位規則第4条第1項該当
Ferrand-Roumet, Catherine. "Importance et devenir du CO2 fixé par les racines nodulées de soja (Glycine max L. Merrill) : incidence sur l'estimation du coût carboné de la fixation de N2." Montpellier 2, 1990. http://www.theses.fr/1990MON20196.
Perner, Mirjam [Verfasser]. "Comparison of Microbial Communities Inhabiting Ultramafic- and Basalt-Hosted Hydrothermal Systems : Genetic Characterization of 16S rRNA Genes, Hydrogen Oxidation and CO2 Fixation Pathways / Mirjam Perner." Kiel : Universitätsbibliothek Kiel, 2008. http://d-nb.info/1019552905/34.
Nowak, Martin [Verfasser], Susan [Gutachter] Trumbore, Erika [Gutachter] Kothe, and Marcus [Gutachter] Horn. "The role of microbial CO2 fixation for belowground carbon cycling and its influence on carbon isotopic signatures / Martin Nowak ; Gutachter: Susan Trumbore, Erika Kothe, Marcus Horn." Jena : Friedrich-Schiller-Universität Jena, 2017. http://d-nb.info/117759952X/34.
Muthusamy, Saraladevi. "Functional Profiling Of Metabolic Regulation In Marine Bacteria." Doctoral thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-58257.
Mochamad, Arief Soleh. "Diversity and Mechanism of the Photosynthetic Induction Response among Various Soybean [Glycine max (L.) Merr.] Genotypes." Kyoto University, 2016. http://hdl.handle.net/2433/215607.
0048
新制・課程博士
博士(農学)
甲第19781号
農博第2177号
新制||農||1041(附属図書館)
学位論文||H28||N4997(農学部図書室)
32817
京都大学大学院農学研究科農学専攻
(主査)教授 白岩 立彦, 教授 奥本 裕, 教授 稲村 達也
学位規則第4条第1項該当
Ruiz-Sanchez, Patricia. "Optimisation de la culture de microalgues en milieu vibré : application à Arthrospira platensis." Compiègne, 2008. http://www.theses.fr/2008COMP1761.
In this work, we aim to develop and characterize a new adapted culture system for A. Platensis. It is based on surface aeration of a flexible pouch bioreactor fixed on a vibrating table. A comparative study between a culture reference system and the vibrated system shows that the growth of A. Platensis is suitable in vibrated culture. The vibrated culture has been firstly optimized by increasing the light at an intensity of 15000 Lux. In these conditions, X reached 1. 0 g/L and P was 0. 2 g/Ld. Furthermore, other cultures were placed at 15000 Lux and then exposed directly to 31700 Lux. It has been showed that at 31700 Lux, the cellular growth is limited by the carbon. The values X and P are respectively 1. 4 g/L and 0. 3 g/Ld. In these conditions, the cellular death appears at pH values higher than 11. To feed microalgae in carbon, we submitted the cellular growth to phototrophic and mixotrophic conditions under pH control using CO2 injection. It allowed to optimize X and P. In phototrophic conditions, X = 3. 4 g/L and P = 0. 49 g/Ld and in mixotrophic conditions, X = 3. 9 g/L and P = 0. 57 g/Ld
Cazenave, Alexandre-Brice. "Réponse adaptative à court terme de la fixation symbiotique du pois protéagineux à une ablation d'une partie des racines nodulées, en lien avec la disponibilité en assimilats carbonés." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS018/document.
Symbiotic N fixation of legumes is very sensitive to environmental stresses, like pea pests damaging nodulated roots. However, the impact on their N uptake capacity and plant growth has not been studied so far.We analyzed the adaptive response symbiotic N2 fixation and plant growth of pea wild type Frisson and hypernodulating mutants P64, P118 and P121 mutated respectively on genes SYM28, SYM29 and NOD3 to root pruning of half the root system at the end of the vegetative stage. The adaptive responses of pea: cv. Frisson and 3 of its hypernodulating mutants were compared under varying carbon supplies from photosynthesis.At 380 ppm, mutant P118 showed the lowest decrease of the specific activity of N fixation (-17%) following root pruning compared to the wild type and the 2 others mutants (-36% to -62%), associated to an acceleration (P118 and P121) and a maintained (wild type and P64) nodule growth. At 150 ppm, following root pruning, specific activity of N fixation of nodules decreased in wild type, was maintained in P64 and P118 and increased in P121. At 750 ppm, specific activity of N fixation of nodules decreased for all genotypes following root pruning, associated to a maintained nodule growth in wild type and P118, a slower growth in P64 and acceleration in P121.Our results showed a greater capacity of hypernodulating mutants P118 and P121 to withstand the stress induced by root pruning of half the root system
Irion, Solène. "Biodiversité de l'écosystème marin et flux de carbone autour de Kerguelen (Océan Austral) : le rôle du petit phytoplancton à l'échelle de la cellule Marked spatiotemporal variations in small phytoplankton structure in contrasted waters of the Southern Ocean (Kerguelen area) Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean." Thesis, Littoral, 2020. https://tel.archives-ouvertes.fr/tel-03178263.
This thesis focuses on small phytoplankton diversity (<20 µm) and its contribution to CO₂-fixation in contrasted marine ecosytems : the productive Kerguelen Plateau (KP) on the one hand and low productive surrounding waters on the other han. Iron-limited phytoplankton communities off-plateau are dominated by small cells all year long, whereas natural iron-fertilization over the KP promotes the seasonal development of chain-forming or large diatom blooms in spring and summer. Since the demonstration of natural iron fertilization on-plateau, the scientific community focused on large diatoms, assumed to promote carbon sequestration in the area. However, satellite data suggest that small phytoplankton dominate the phytoplankton communities outside of the bloom period on- and off-plateau. Consequently, this thesis had two main objectives. The first objective of this work was to obtain a precise image of the diversity of small and large phytoplankton after the diatom bloom (March 2018). A fragment of the 18S rRNA gene from small (0.2-20 µm) and large (20-100 µm) planktonic communities collected at discrete depths (down to 300 m), was sequenced (Illumina MiSeq) and used as an identity marker gene to determine the taxonomic diversity of small and large phytoplankton. At the surface, diatoms were dominant in the large-size fraction, while Phaeocystis antartica was particularly abundant in the small-size fraction, over the entire study area. As a whole, small phytoplankton communities were significantly different on- and off-plateau. High concentrations of silicic acid off-plateau favored the presence of a diverse assemblage of small diatoms, while high concentrations of ammonium on-plateau likely promoted the development of pico-sized Micromonas. Using chemotaxonomic pigments markers allowed the description of the temporal succession of phytoplankton communities on-plateau, dominated by diatoms from the onset to the decline of the bloom, while the contribution of small phytoplankton increased sharply after the bloom (less than 10% to 53% chlorophyll). The second objective of this thesis was to establish the relative contribution of different phytoplankton groups to bulk CO₂-fixation, considering inter- and intra-group differences in the metabolic activity if individual cells. To do so, natural planktonic communities were incubated mimicking in situ conditions in the presence of an isotopic tracer (NaH¹³CO₃). CO₂-fixation by small and large cells was then measured at the single cell level by NanoSIMS and SIMS imaging (mass spectrometry with lateral resolution of 50 nm and 1 µm, respectively). Large diatoms (> 20 µm) showed highly variable growth rates with 19±13 % inactive diatoms, whereas small cells, affiliated to distant phylogenetic taxa (prymnesiophytes, prasinophytes and small diatoms) were actively growing (>98%). This showed that small phytoplankton contributed to 41-70% of CO₂-fixation over the entire area after the bloom. While small phytoplankton contributed significantly to CO₂-fixation and chlorophyll biomass at the surface, diatoms dominated in pigment and sequencing data below 200 m, indicating their preferential export by direct sedimentation. However, a body of evidence suggests that small phytoplankton, in particular Phaeocystis, may contribute to carbon export through aggregation, as well as via the production of fecal pellets from grazers
Vale, Diego Wyllyam do. "Manejo da palha, adubação nitrogenada potássica e uso de inoculante em soca de cana-de-açúcar." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-23042013-100854/.
The harvesting of sugarcane, straw removal without fire, is growing in Brazil. In this culture system, there are many questions about the management of residue, and the amounts of nitrogen and potassium to be used. This study aimed to evaluate the straw management sugarcane, nitrogen, potassium and use of inoculants in commercial sugarcane. For this experiment was installed in Piracicaba - SP, in the Oxissol cultivated with the variety of sugarcane CTC 9, in a randomized block design in a incomplete factorial 3x6x4, totaling 153 plots, three management of stubble-MP (distribution of sugarcane trash in every area-MPT, removal of straw only rows of sugarcane MPRL and windrowing straw every two lines-MP2:1) six doses of N (application of 0, 60, 120 and 180 kg ha-1 of N, applied in line with the cane solution containing five species of nitrogen-fixing bacteria in the absence of nitrogen fertilizer application on line and cane solution containing five species of nitrogen-fixing bacteria plus 30 kg ha-1 of mineral N), four doses of K (0, 50 , 100 and 150 kg ha-1 of K2O) and three replications. The variables analyzed along the two years were: soil chemical analysis, CO2 emission, foliar diagnosis, biological and technological evaluations and straw yield of sugarcane. The application of nitrogen and potassium affect soil fertility, leaf N content, theoretical recoverable sugar and growth of sugarcane. The application of 80 kg ha-1 of K2O is sufficient to present the first high productivity (87 t ha-1) and second ratoon sugarcane (141 t ha-1) and there was no response from the application nitrogen mineral. The inoculant application did not increase productivity of sugarcane. The MPRL proved as the most promising in relation to growth and productivity of sugarcane. The MPRL had lower moisture and higher carbon footprint compared to MPT and MP2:1. In the 1st ratoon, the MPT, MPRL and MP2:1, the emission of CO2 was 1.7, 2.0 and 1.7 ?mol m-2 s-1, the temperature was 21.7, 21.7; 21.2 ºC and humidity was 11.1, 6.6 and 9.5%, respectively. In the 2nd ratoon in MPT, MPRL and MP2:1 first, the CO2 was 1.8, 2.1 and 1.6 ?mol m-2 s-1, the temperature was 21.4, 22.9; 22, 4 ºC and the humidity was 16.9, 12.3 and 11.5%, respectively. The emission of CO2 increased with the growth of plants sugarcane and oscillated 6 to 12.4 ?mol m-2 s-1.
Zhang, Kun. "Fumaric Acid Fermentation by Rhizopus oryzae with Integrated Separation Technologies." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354729467.
Wright, K. M. "The influence of ammonia on photosynthetic and dark CO2̲ fixation in higher plants." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379318.
Lenoir, Guillaume. "Etude des changements de conformation de l'ATPase-Ca2+ du réticulum sarcoplasmique (SERCA1) associés à la fixation et au transport de Ca2+." Paris 11, 2004. http://www.theses.fr/2004PA11TO14.
Kreibich, Julian. "Mechanistic insights into carbon monoxide and CoA binding at the Ni,Ni-[4Fe-4S] active site of the acetyl-CoA synthase from Carboxydothermus hydrogenoformans." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/23215.
The acetyl-CoA synthase (ACS) harbors a unique metal cluster (cluster A) in its active site, which is important for bacteria and archaea to survive in autotrophic growth using the reductive acetyl-CoA. The last step of this pathway is catalyzed by ACS at the Nip, the Ni ion proximal to the [4Fe-4S] cluster. In my study, the monomeric ACS of Carboxydothermus hydrogenoformans (ACSCh) was studied in its ligand binding and crystallized in different forms. At first, an ACSCh structure was solved in a new conformation at dmin of 2.1 Å and less solvent exposed (called ACSCh-closed) than the known structure of ACSCh (called ACSCh-open, PDB-ID:1RU3). The cluster A of ACSCh-closed differs to that of ACSCh-open in the coordination of the proximal Ni, which is distorted tetrahedrally coordinated in ACSCh-closed and square planar coordinated in ACSCh-open. Analysis of the model revealed a molecular tunnel that is only present in ACSCh-closed, which might act as CO channel for substrate delivery. Secondly, a CO-bound ACSCh-closed crystal was obtained and solved at a resolution of 2.0 Å. An electron density fitting with a diatomic ligand at the Nip site was clearly identified and modeled as a CO molecule. CO binds at the Nip site completing the tetrahedral coordination geometry of Nip. The conformational switch between open and closed is responsible for CO migration and binding to the catalytic site. A third crystal structure depicts a CoA bound ACSCh structure at 2.3 Å resolution. CoA binds at the Nip which shows a square planar geometry. This was further supported by calculating different electron density maps for CoA. The binding of CO and CoA to ACSCh has been characterized by isothermal calorimetry experiments. While CoA binding is enthalpically driven with a KD of 3.1 µM, CO binds to ACSCh by entropic contribution with a KD of 9.4 µM.
Leroy, Didier. "Interaction polyamines/protéine-kinase CK2 : étude moléculaire et fonctionnelle." Grenoble 1, 1996. http://www.theses.fr/1996GRE10046.
GOMES, Antonio Aristófanes da Cruz. "Desenvolvimento de uma placa de fixação óssea utilizando liga com memória de forma Ni-Ti." Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1922.
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CNPq
Os procedimentos cirúrgicos de reconstrução crânio facial vêm se desenvolvendo significativamente e grande parte desse progresso se deve às inovações nas técnicas cirúrgicas e ao emprego de novos materiais na fabricação dos dispositivos de fixação. O objetivo principal é tornar os procedimentos mais eficientes e menos invasivos aos pacientes, consequentemente haverá diminuição nos índices de retrabalhos. O emprego de Ligas com Memória de Forma (LMF) pode ser uma alternativa interessante nesses casos, uma vez que esses materiais possuem um comportamento adaptativo, com a capacidade de reagir a estímulos externos de natureza térmica ou mecânica. As LMF da família Ni-Ti lideram o interesse das pesquisas devido ao maior número de aplicações comerciais, principalmente nas áreas médica e odontológica. Essas LMF Ni-Ti, além de serem biocompatíveis possuem também módulo de elasticidade inferior ao de ligas de titânio, como o Ti-Al-V, e dos aços inoxidáveis. Neste contexto, o objetivo deste trabalho é desenvolver um protótipo de placa de fixação óssea, que poderá ser destinada a procedimentos de trauma e reconstrução mandibular, utilizando uma LMF Ni-Ti com características superelásticas. Foi escolhido um elemento de fixação, tipo placa, como modelo para os protótipos e as dimensões foram baseadas em componentes fornecidos comercialmente. Para a fabricação dos dispositivos optou-se pelos processos de fundição de precisão: Plasma Skull Push-Pull (PSPP), e fusão por indução com injeção por centrifugação (FIC), os quais se mostraram bastante eficazes. Foram realizados ensaios de caracterização para determinar as propriedades térmicas e mecânicas do dispositivo fabricado. Os principais resultados foram um componente de rigidez variável com a temperatura, módulo de elasticidade da ordem de 50 GPa na temperatura corpórea e vida em fadiga ente 103 e 106 para amplitudes de deslocamento em flexão entre 0,5 mm e 2,5 mm. Estes resultados de caracterização termomecânica indicam o potencial das LMF Ni-Ti e dos processos de fundição de precisão para a produção de placas de fixação óssea.
Surgical procedures for facial skull reconstruction have been developing significantly and much of this progress is due to innovations in surgical techniques and the use of new materials in the manufacture of fastening devices. The main objective is to make the procedures more efficient and less invasive to the patients, consequently there will be a decrease in the rates of reworking. The use of Shape Memory Alloys (SMA) may be an interesting alternative in these cases, since these materials have an adaptive behavior, with the ability to react to external stimuli of a thermal or mechanical nature. The SMA of the Ni-Ti family lead the research interest due to the greater number of commercial applications, mainly in the medical and dental areas. In addition to being biocompatible, these Ni-Ti SMAs also have lower modulus of elasticity than titanium alloys, such as Ti-Al-V, and stainless steels. In this context, the objective of this work is to develop a prototype bone fixation plate, which can be used for trauma and mandibular reconstruction procedures, using a Ni-Ti SMA with superelastic characteristics. A plate-type fastening element was chosen as the prototype model and the dimensions were based on commercially supplied components. In order to manufacture the devices, it was chosen the precision casting processes: Plasma Skull Push-Pull (PSPP) and induction fusion with centrifugal injection (FCI), which proved to be quite effective. Characterization tests were performed to determine the thermal and mechanical properties of the fabricated device. The main results were a variable stiffness component with temperature, modulus of elasticity of the order of 50 GPa at body temperature and fatigue life between 103 and 106 for flexural displacement amplitudes between 0.5 mm and 2.5 mm. These thermomechanical characterization results indicate the potential of Ni-Ti SMA and precision casting processes for the production of bone fixation plates.
Galindo, Fernando Shintate. "Inoculation with Azospirillum brasilense associated with silicon applied to correct soil acidity and nitrogen rates in corn and wheat crops /." Ilha Solteira, 2020. http://hdl.handle.net/11449/192642.
Resumo: Alternative management practices are needed to minimize the need for chemical fertilizer use in non-leguminous cropping systems. The use of biological agents which can fix atmospheric nitrogen and promote plant growth has shown potential as an option to improve soil nutrient availability to grass crops. In recent years, studies investigating the effects of silicon (Si) have increased substantially, especially in grain crops. This increased interest in Si is likely due to the beneficial effects of Si application on plant resistance to abiotic and biotic stresses, reflecting on greater plant development. This research was developed to investigate if inoculation of corn and wheat with Azospirillum brasilense associated with Si can enhance nitrogen use efficiency (NUE) and improve plant nutrition and yield, leading to a greater economic profit. The study was set up in a Rhodic Haplustox under no-till system, located in Selvíria, state of Mato Grosso do Sul, Brazil. The field trial took place during the 2015/16 (November-March), 2016 (April-September), 2016/17 (November-March) and 2017 April-September) seasons, with corn and wheat crops in sucession (spring/summer and winter seasons for corn and wheat, respectively). Treatments were tested in a randomized completely block design with four replicates, arranged in a full factorial design 5 × 2 × 2 and included: i) five N application rates, as urea source, applied in side-dressing (0, 50, 100, 150 and 200 kg ha-1); ii) two liming sou... (Resumo completo, clicar acesso eletrônico abaixo)
Doutor
YANG, REN-HONG, and 楊仁宏. "A study of fixation CO2 in microalgae." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/59825239928406294633.
明新科技大學
土木工程與環境資源管理系碩士班
101
Abstract In recent years, the amount of CO2 emissions are causing global warming, CO2 immobilization technology can’t be ignored. In Taiwan, various CO2 reduction method, the use of algae fixed CO2 reduce the co2 pollution problems, and solid carbon frond resource, and therefore deemed to be one of the economic efficiency of the method. In this study, chlorella as the main object, discussion chlorella in a different growth factor, carbon sequestration efficiency and growth rate differences, by different inoculation concentration, temperature and light intensity, to identify the most suitable free environment for the growth and the best efficiency of carbon sequestration. The experimental results show a linear relationship, the relationship between chlorophyll and algae dry weight, using the calibration curve can be calculated by the chlorophyll content of the algae dry weight calibration curve R2 = 0.998 accurately a very high degree. Also found that chlorella carbon fixation rate, not due to the different from inoculum concentration, another light intensity is too high or the temperature is too low will result in chlorella Yang system growth, ball algae growth and carbon fixation rate is quite obvious, chlorella growth in the range of an environment conducive to the growth and carbon fixation rate and growth rate will be greatly enhanced. A 30℃ environment to 4000 LUX continuous irradiation 24 hours and the initial water quality the best growth efficiency and carbon fixation rate was adjusted to pH = 6.0 can be achieved, in water 404.1 mg / L of carbon dioxide via the 5-day training will be depleted, and the chlorella cell concentration can be achieved 102.013 mg / L, the growth rate of 0.513 d-1.
Flowers, Brendan John Scott. "CO2 fixation : catalytic synthesis of β-hydroxycarboxylic acids." Thesis, 2008. http://hdl.handle.net/1974/1368.
Thesis (Master, Chemistry) -- Queen's University, 2008-08-26 10:17:34.703
Graham, Amanda. "NITROGEN FIXATION AND THE FATE AND TURNOVER OF CARBON FIXED THROUGH HYDROGEN-COUPLED CARBON DIOXIDE FIXATION IN SOYBEANS." Thesis, 2013. http://hdl.handle.net/1974/7785.
Thesis (Master, Geography) -- Queen's University, 2013-01-30 09:28:01.899
Peng, Yu-Hua, and 彭于華. "Study on the Growth Conditions for Fresh Water Microalgae CO2 Fixation." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/30878838799825275890.
國立屏東科技大學
環境工程與科學系所
97
Industrial development consume huge amount of coal, petroleum, natural gas and release massive amount of greenhouse gases. Couple with population growth and forests cutting, greenhouse gases cause global warming and many climate change induced disasters recently. After realized these not-natural disasters will origin large-scale ecosystem broken, human life threaten, and economy crash, The United Nations had drawn up The United Nation Framework Convention on Climate Change and Kypto Protocol to limit greenhouse gases emission. This study is also trying to do the effort on global warming issue. We like to find out the best growth condition for freshwater microalgae CO2 fixation in South Taiwan. Chlorella vulgari collected from pound in NPUST was selected as material. The M4N medium used to supply essential nutrients for microalgae growth. Six parameters were choose to exam microalgae growth rate which were: algae injecting concentration (329 mg/L、522 mg/L、648 mg/L and 770 mg/L); temperature (15, 25 and 35℃); CO2 concentration (5, 10, 15 and 20 %); light cycles (night/day) (12 and 24 hours); pH value (5, 6, 7 and 8); and light source (plant lamp, fluorescent tubes, and LED red lamp). The culture cycle was incubated in a growth chamber for 15 days. Spectrophotometer was used to measured growth curve at wavelength 680nm. In summary, the maximum biomass and CO2 fixation rate was at the condition that solution pH = 7.0, 24 hours lighting by fluorescent tubes, 10% CO2 injected, 35℃, and the initial Chlorella vulgaris concentration was 522mg / L. Under these conditions we could get 4,659 mg/L of microalgae biomass and 5,594 mgCO2/L of CO2 fixation.
Chen, Shin-Yi, and 陳欣億. "The Study of CO2 Fixation on The Magnesium-Lithium Mixed Metal Complexes." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/44540240620332177603.
國立中山大學
化學系研究所
91
The reaction of Mg(NPh2)2 with LiNR2 (R= SiMe3, NiPr, NiBu) generated the same product, [Mg(NPh2)3(THF)][Li(THF)4] which was identified by 1H-NMR and X-ray crystallography. The magnesium-lithium mixed metal complex reacted with excess carbon dioxide in the ice bath to generate the tetralithium complex, Li4(O2CNPh2)4(THF)4 which was identified by 1H-NMR, 13C-NMR, IR, and X-ray crystallography.
Chen, Kuan-Wei, and 陳冠薇. "Carbonation of Steel-making Slag for CO2 Fixation and Utilization in Blended Cement." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/36475952635977735426.
國立臺灣大學
環境工程學研究所
103
This study explores the feasibility of developing sustainable construction materials via mineral carbonation of steelmaking slag, i.e., basic oxygen furnace slag (BOFS). The carbon fixation capacity of BOFS was quantified by thermo-gravimetric analysis. Various engineering properties and hydration characteristics of blended cement with 10 % of both fresh BOFS and carbonated BOFS by weight as cement replacement was investigated. The results indicate mineral carbonations accompanied by significant reduction in basicity and fixing 0.202 and 0.221 kg CO2/kg BOFS at 30 oC and 60 oC within the rotating packed bed (RPB) reactor. The reaction kinetics of carbonation experiments could be well expressed by the surface coverage model, with R2 values ranged from 0.97 to 0.98. Cement blended with 10 wt% of carbonated BOFS resulted in reduced setting times and accelerated early strength development, which was consistent with the results of hydration heat and XRD observations. The SEM observations suggest that the carbonated BOFS could serve as nuclei for the precipitation of hydration products, while also accelerating the hydration. In addition, blended cement with 10 % of carbonated BOFS improved sulfate resistance ability and drying shrinkage property compared to 10 % of fresh BOFS at ambient temperature (23oC). The mineralogical composition changes after carbonation have beneficial effects on the hydraulic property in concrete. It was thus concluded that the carbonation of steelmaking slag should be considered as a feasible and attractive process for carbon fixation and waste valorization