Maria Concepcion Tamayo Ordoñez

Autonomous University of Coahuila | UAdeC · Faculty of Chemistry

Microalgae have been positioned as excellent models for producing new sources of energy (biofuels and biohydrogen). Some investigations in these biological models have been directed to know if the enzymes ferredoxin (FDX) and hydrogenase (HYD) are involved in the algae producing different concentrations of molecular hydrogen (H 2). To date, little...

In this research, cell growth of the microalga Chlorella vulgaris was evaluated at different light spectra (white, blue, purple, red) at 100 μ m-2s-1 and constant aeration flow of 2.5 vvm, in bubble column photobioreactors (FBR); At the end of each experiment, biomass extraction was carried out, centrifuging the culture medium at 4,000 rpm for 10 m...

Breakthrough in obtaining higher performance in triacylglycerols and obtaining different chemicals, such as alcohols, alkanes, carboxylic acids and fatty acids; commodity chemi cals, such as monoalcohols, diols, carboxylic, and dicarboxylic acids; and biopolymers. Several micro organisms have been genetically manipulated to produce desirable molecu...

For centuries, people have used enzymes and other compounds produced by several model organisms, like microorganisms, plants, and animals, to obtain biotechnological products. The production of enzymes and different products of commercial interest can be obtained through the genetic manipulation of the metabolic pathways. The products obtained by t...

Microalgae are a favorable source for the production of renewable bioenergy. There are extensive reviews of the use of microalgae for the production of biohydrogen, bioethanol, biofuels, production of a variety of metabolites and other products of commercial interest such as polysaccharides, TGAs and pigments, among others. Nowadays there are two s...

Bacteria can be described as microscopical factories for primary and secondary metabolites, by the use of their enzyme machinery. For centuries, we have been using bacteria to meet our needs. Today, the use of bacteria has been extended, and genetic engineering plays a key role in the transformation of microbes into desires cell factories with high...

Batch tests were carried out to investigate the production of H2 considering the effects of: substrate concentration in a range of 3–25 g-COD/L; Initial pH: from 4 to 7 and 11 and temperatures of: 20, 35, 45 and 55 °C. The optimal substrate was 25 g-COD/L, with a reduction of COD of 73% and a yield of H2 of 5.95 mM/gCOD; and the optimal initial pH...

Bovine ruminal fluid (BRF) bioaugmented with Clostridium acetobutylicum (Clac) was assessed for hydrolyzing cellulose and produce biohydrogen (BioH2) simultaneously from pretreated corncob in a single step, without the use of external hydrolytic biocatalysts. The corncob was pretreated using three thermochemical methods: H2SO4 2%, 160 °C; NaOH 2%,...

There is ongoing research related to the production of molecular hydrogen today and algae have proven to be good biological models for producing several compounds of interest. We analyzed how genetic variations in hydrogenase genes ( hyd ) can affect the production of molecular hydrogen in the algae Chlorella vulgaris and Scenedesmus obliquus . Thr...

Due to the increased availability and production of lignocellulosic agroindustrial wastes, it has been proposed to use them as raw material to obtain biofuels (ethanol and biodiesel) or derived products. However, for the degradation of biomass generated from lignocellulosic residues to be successful, in most cases, their physical (thermal), chemica...

The Handbook of Research on Bioenergy and Biomaterials: Consolidated and Green Processes provides an understanding of consolidated processing and biorefinery systems for the production of bio-based chemicals and value-added bioproducts from renewable sources. The chapters look at a variety of bioenergy technological advances and improvements in the...

The present work was to study the fermentation and the hydraulic retention times effect using surface response methodology for hydrogen production using a synthetic media as sustrate. The reactor used 60 spheres with anaerobic biofilms developed in fiber ixtle for immobilization of anaerobic sludge and was operated at mesophilic temperatures and in...

Mezcal is a distillate produced by spontaneous fermentation of musts obtained from stalks of Agave spp. plants that are cooked and pressed. Agave musts contain a high amount of fructose and phenolic compounds, and fermentations are usually operated under stressful (and uncontrolled) environmental conditions. Yeasts capable of grow under such condit...

Insects of the genus Spodoptera Guenée (Noctuidae) are responsible for great economic losses in important crop plants such as maize and rice, among others. Efforts have been made to control this pest using organophosphate, carbamate, pyrethroid, and benzoylurea pesticides to which these insects have developed resistance. For this reason, it is urge...

Several of the over 200 known species of Agave L. are currently used for production of distilled beverages and biopolymers. The plants live in a wide range of stressful environments due to their resistance to abiotic stress (drought, salinity, extreme temperature) and pathogens, which gives the genus potential for germplasm conservation and biotech...

Agave L. is a genus of economic importance, and many of the 166 species in the American plant genus Agave L. inhabit high-stress environments, which makes the genus promising for facing global climate change. However, sustainable use of economically important species without interfering with their ecology and evolution requires generating knowledge...

Los agaves pertenecen a la familia Asparagaceae y forman la subfamilia Agavoideae. La suma de adaptaciones morfológicas y fisiológicas a la sequía y temperatura permite a estas plantas adaptarse a una gran variedad de ambientes, lo que contribuye a su amplia dispersión. No existe una filogenia de la familia Asparagaceae que permita delimitar los gé...

Molecular markers have proven to be powerful tools in research related with diversity, variability, and improvement of economically important tropical crops. This study analyzed eight physiological and morphological fruit characters of economic interest in the cultivated Mexican guava (Psidium guajava L.), and assessed the suitability of two sequen...

Biofuels have been shown to be a promising and highly attractive alternative for minimizing the use of fossil fuels, and microalgae have positioned themselves as potential candidates for production of lipids and other substances of commercial interest. We briefly review recent advances made in microalgae culture conditions and genetic manipulation...

Whole-genome duplication (polyploidy) occurs frequently and repeatedly within species of plants. According to the source of the genomes giving origin to a polyploid plant species, these are classified into allopolyploid (when two or more genomes are combined through either intraspecific or interspecific hybridization) and autopolyploid (when a sing...

Polyploidy has been widely described in many Agave L. species, but its influence on environmental response to stress is still unknown. With the objective of knowing the morphological adaptations and regulation responses of genes related to biotic (LEA) and abiotic (NBS-LRR) stress in species of Agave with different levels of ploidy, and how these f...

The structure and organization of the genome of Agave is still unknown. To provide a genomic tool for searching sequences of the genus, we built and characterized a binary (BIBAC2) genomic library of Agave tequilana Weber var. azul. Clones of the library had an average insert size of 170 Kb. The frequency of inserts with internal Not I sites was 30...

Tissue culture can be used to propagate elite material or to generate new variability by employing somaclonal variation. Genetic stability of the process must be evaluated analyzing DNA profiles by the use of molecular markers. Several techniques have been reported for the screening of genetic variation on tissue culture derived material; however,...