The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform
Alberto S Cerezo - One of the best experts on this subject based on the ideXlab platform.
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the fibrillar polysaccharides and their linkage to algaenan in the trilaminar layer of the cell wall of Coelastrum sphaericum chlorophyceae
Journal of Phycology, 1999Co-Authors: Maria Cecilia Rodriguez, Miguel D Noseda, Alberto S CerezoAbstract:Methylation and spectroscopical analyses of DMSO-LiCl-solubilized fractions of the fibrillar cell wall of Coelastrum sphaericum Nag. established the presence of cellulose and β-1,4-linked mannan. A small proportion (2–7%) of (12) linkages in β-mannan that introduced an interruption in the regular ribbon chain conformation was interpreted as a component that modulated the mechanical strength of the cell wall. The trilaminar layer fractions consisted mostly of algaenan and cellulose. Evidence for ether linkages between glucose C-6 in the β-1,4-glucan and algaenan was obtained.
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the resistant biopolymer in cell walls of Coelastrum sphaericum
Phytochemistry, 1996Co-Authors: Maria Cecilia Rodriguez, Alberto S CerezoAbstract:The resistant ‘polymer’ in the trilaminar sheath of Coelastrum sphaericum is a complex formed by three different types of biopolymers, a hydrophobic aliphatic network mainly composed of polymethylenic chains with amido groups, together with smaller amounts of cellulose and proteins. The composition of the hydrophobic polymer is close to that of algaenan of other trilaminar layer-containing species.
Luis Felipe Barahona-pérez - One of the best experts on this subject based on the ideXlab platform.
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Effect of Media Composition and Culture Time on the Lipid Profile of the Green Microalga Coelastrum sp. and Its Suitability for Biofuel Production
BioEnergy Research, 2020Co-Authors: Ruby Alejandra Valdez-ojeda, Maria Guadalupe Serrano-vázquez, Tanit Toledano-thompson, Juan Carlos Chavarría-hernández, Luis Felipe Barahona-pérezAbstract:The development of biofuels as an alternative to the use of fossil fuels is growing worldwide due to environmental concerns and energy independence; thus, considerable technical progress has been achieved in biofuel production. Microalgae have been widely used for nutrient removal during wastewater treatment and produce compounds that can be used as feedstock for biofuel synthesis. In this work, the green microalga Coelastrum sp. was cultivated using industrial wastes: molasses as the carbon source and synthetic wastewater as the culture medium to determine the potential of its use for biofuel production. The use of synthetic wastewater (SWW) and molasses improved biomass production when compared with cultures carried out in a standard laboratory culture medium, such as tris-acetate-phosphate (TAP). Growth rates of 0.31 and 1.4 day^−1 were attained during exponential growth rate with SWW and molasses and TAP media, respectively. The best results in biomass and lipid content, 2.29 ± 0.05 and 0.71 ± 0.03 g L^−1, were obtained after 15 days of culture in SWW with molasses. The analysis of the lipid profile, produced by Coelastrum sp. cultured under these conditions, determined that the microalga can be considered as a high-quality feedstock for producing green diesel, bio-jet fuel, or biodiesel.
Sven Baszio - One of the best experts on this subject based on the ideXlab platform.
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A green alga of the genus Coelastrum Naegeli from the sediments of the Tertiary Lake Messel
Palaeobiodiversity and Palaeoenvironments, 2013Co-Authors: Gotthard Richter, Wolfgang Schiller, Sven BaszioAbstract:A chlorococcal alga of the genus Coelastrum is firstly described from the sediments of the Eocene Lake Messel on the basis of morphological characters and fluorescence microscopy. The great abundance of this alga in massive parts of the stratigraphic section shows its significance for the Messel ecosystem in Eocene times, besides other known algae from this locality. The very favourable conditions of fossilisation allow the identification of various generational stages of this alga. Interestingly, the best preserved specimens were found in small fish coprolites (although we interpret Coelastrum sp. as by-catch and not an important source of food for fish).
Maria Cecilia Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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the fibrillar polysaccharides and their linkage to algaenan in the trilaminar layer of the cell wall of Coelastrum sphaericum chlorophyceae
Journal of Phycology, 1999Co-Authors: Maria Cecilia Rodriguez, Miguel D Noseda, Alberto S CerezoAbstract:Methylation and spectroscopical analyses of DMSO-LiCl-solubilized fractions of the fibrillar cell wall of Coelastrum sphaericum Nag. established the presence of cellulose and β-1,4-linked mannan. A small proportion (2–7%) of (12) linkages in β-mannan that introduced an interruption in the regular ribbon chain conformation was interpreted as a component that modulated the mechanical strength of the cell wall. The trilaminar layer fractions consisted mostly of algaenan and cellulose. Evidence for ether linkages between glucose C-6 in the β-1,4-glucan and algaenan was obtained.
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the resistant biopolymer in cell walls of Coelastrum sphaericum
Phytochemistry, 1996Co-Authors: Maria Cecilia Rodriguez, Alberto S CerezoAbstract:The resistant ‘polymer’ in the trilaminar sheath of Coelastrum sphaericum is a complex formed by three different types of biopolymers, a hydrophobic aliphatic network mainly composed of polymethylenic chains with amido groups, together with smaller amounts of cellulose and proteins. The composition of the hydrophobic polymer is close to that of algaenan of other trilaminar layer-containing species.
Maedeh Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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co2 bio fixation and biofuel production in an airlift photobioreactor by an isolated strain of microalgae Coelastrum sp sm under high co2 concentrations
Environmental Science and Pollution Research, 2018Co-Authors: Shokouh Mousavi, Ghasem D Najafpour, Maedeh MohammadiAbstract:Microalgae cultivation is a promising approach to remove ambient CO2 via photosynthesis process. This paper investigates the impact of high CO2 concentrations (6, 12, and 16%) on algae growth, CO2 biofixation, lipid and carbohydrate contents, and nutrient removal of newly isolated microalgae, Coelastrum sp. SM. In addition, the ability of microalgae to produce biodiesel at optimal condition was studied. The microalgae were cultivated in wastewater using an airlift photobioreactor. Under 12% CO2, the maximum biomass productivity and CO2 fixation rate were 0.267 g L−1 day−1 and 0.302 g L−1 h−1, respectively. Total Kjeldahl nitrogen (TKN), total phosphorous (TP), nitrate, and sCOD removal efficiency were 84.01, 100, 86.811, and 73.084%, respectively. Under 12% CO2 and at the same condition for cell growth, the highest lipid and carbohydrate contents were 3 7.91 and 58.45%, respectively. The composition of fatty acids methyl ester (FAME) of the microalga lipid was defined. Based on the obtained results and FAME profile, Coelastrum sp. SM was a suitable feedstock for biodiesel production and also, the organism had a great potential for CO2 biofixation, which is also more suitable than any other reported strains in other related studies.
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cultivation of newly isolated microalgae Coelastrum sp in wastewater for simultaneous co 2 fixation lipid production and wastewater treatment
Bioprocess and Biosystems Engineering, 2018Co-Authors: Shokouh Mousavi, Ghasem D Najafpour, Maedeh Mohammadi, Mohammad Hasan SeifiAbstract:Cultivation of microalgae in wastewater is a promising and cost-effective approach for both CO2 biofixation and wastewater remediation. In this study, a new strain of Coelastrum sp. was isolated from cattle manure leachate. The isolated microalgae were then cultivated in wastewater. Effects of different sCOD concentrations (600, 750, 900, 1050 mg L−1) and light intensities (1000, 2300, 4600, 6900 and 10000 Lux) on biomass production, CO2 consumption rate and nutrient removal from wastewater were investigated. The results showed that maximum cell growth and CO2 consumption rate were 2.71 g L−1 and 53.12 mg L−1 day−1, respectively, which were obtained in the wastewater with 750 mg L−1 sCOD and under the light intensity of 6900 Lux. The microalgae were able to completely consume all CO2 after incubation period of 4 days. The highest sCOD, total Kjeldahl nitrogen (TKN), nitrate and total phosphorous (TP) removal at such conditions were 53.45, 91.18, 87.51 and 100%, respectively. The lipid content of microalgal biomass was also measured under different light intensities; maximum amount of lipid was determined to be 50.77% under illumination of 2300 Lux. Finally, the CO2 consumption rate and biomass productivity of microalgae in semi-batch culture with continuous gas flow (CO2 6%:N2 94%) were investigated. The rate of CO2 consumption and biomass productivity were 0.528 and 0.281 g L−1 day−1, respectively. The TKN, nitrate, TP and sCOD removal rate of microalgae were 83.51, 80.91, 100, 41.4%, respectively.