- Iedit
... por Arturo Elosegi Irurtia, Sergi Sabater i Cortés Árbol académico , 2009, ISBN 978-84-96515-87-1 , págs. 219-242. Fundación Dialnet. Acceso de usuarios registrados. Acceso de usuarios registrados Usuario. Contraseña. Entrar. Mi... more
... por Arturo Elosegi Irurtia, Sergi Sabater i Cortés Árbol académico , 2009, ISBN 978-84-96515-87-1 , págs. 219-242. Fundación Dialnet. Acceso de usuarios registrados. Acceso de usuarios registrados Usuario. Contraseña. Entrar. Mi Dialnet. ...
Research Interests:
Attached or floating macroscopic cyanobacteria can be found in shallow waters and can be easily hand-collected, but their identification is often challenging due to their high morphological variability. In addition, many members of... more
Attached or floating macroscopic cyanobacteria can be found in shallow waters and can be easily hand-collected, but their identification is often challenging due to their high morphological variability. In addition, many members of environmental samples lose their morphological adaptations under controlled conditions, making the integration of analyses of field populations and derived isolated cultures necessary in order to evaluate phenotypic plasticity for identification purposes. Therefore, in this study, twenty-nine macroscopic field samples were analyzed by Illumina sequencing and parallel optical microscopy. Some colonies showed the typical morphological characteristics of Rivularia biasolettiana, and others showed those of Rivularia haematites. However, other Rivularia-like colonies showed ambiguous morphologies, and some of them showed the phenotypic features of the new genus Cyanomargarita, which is virtually indistinguishable from Rivularia in the field. In all of the colo...
Research Interests:
ABSTRACT Two cyanobacterial strains developed morphology characteristic of Nostochopsis, i.e. with many heterocysts in side branches when grown in low phosphate medium. When grown in high phosphate medium both strains developed morphology... more
ABSTRACT Two cyanobacterial strains developed morphology characteristic of Nostochopsis, i.e. with many heterocysts in side branches when grown in low phosphate medium. When grown in high phosphate medium both strains developed morphology characteristic of Fischerella muscicola. The converse did not occur with two culture strains classified as Fischerella in that neither developed Nostochopsis morphology when grown in low phosphate. However, there was a slight increase in the percentage of heterocysts that were closely attached to main trichome axes rather than to a cell-forming part of the axis. However, all analysed strains had similar increases in surface phosphomonoesterase activities under low phosphate. Because some literature on Nostochopsis in the field indicates that it can be found only at one time of year, the possibility is discussed that it is recognised only when phosphate is limited. It seems likely that contradictory results in past molecular literature resulted from the same strain being compared in different studies, one using low and the other using high phosphate medium. Our molecular analysis supports morphological differences between the studied strains, and taxonomic assignments are discussed on the basis of previous phylogenetic analyses. Abbreviations: PMEase; phosphomonoesterase activity; pNPP, para-nitrophenyl phosphate
Research Interests:
The Sahara Desert is characterized by extreme environmental conditions, which are a unique challenge for life. Cyanobacteria are key players in the colonization of bare soils and form assemblages with other microorganisms in the top... more
The Sahara Desert is characterized by extreme environmental conditions, which are a unique challenge for life. Cyanobacteria are key players in the colonization of bare soils and form assemblages with other microorganisms in the top millimetres, establishing biological soil crusts (biocrusts) that cover most soil surfaces in deserts, which have important roles in the functioning of drylands. However, knowledge of biocrusts from these extreme environments is limited. Therefore, to study cyanobacterial community composition in biocrusts from the Sahara Desert, we utilized a combination of methodologies in which taxonomic assignation, for next-generation sequencing of soil samples, was based on phylogenetic analysis (16S rRNA gene) in parallel with morphological identification of cyanobacteria in natural samples and isolates from certain locations. Two close locations that differed in microenvironmental conditions were analysed. One was a dry salt lake (a “chott”), and the other was an...
Research Interests:
Olive tree leaves, an abundant agricultural by-product without enough industrial market outlets, are presented in this study as a relevant resource of available carbohydrates to be chemically treated for monomeric sugar production.... more
Olive tree leaves, an abundant agricultural by-product without enough industrial market outlets, are presented in this study as a relevant resource of available carbohydrates to be chemically treated for monomeric sugar production. Characterization of two main granulometric fractions is the starting point for testing the specific effect and the relevance of three main factors (time, temperature, and sulfuric acid concentration) on diluted acid hydrolysis with respect to oligosaccharides, simple sugars, and fermentation inhibitory compounds production. The selected conditions (100 ∘ C, 90 min, and 6% w/w H 2 SO 4 ) to perform the small scale hydrolytic process, considering response surface methodology (2 3 factorial design with center points), implied production of acetic acid and hydroxymethylfurfural in concentrations not exceeding 1.10 kg m − 3 and 0.25 kg m − 3 , respectively. Thus, these experimental conditions were the reference framework to evaluate the effect of a meaningful ...
Research Interests:
Research Interests:
Cyanobacteria are key microbes in topsoil communities that have important roles in preventing soil erosion, carbon and nitrogen fixation, and influencing soil hydrology. However, little is known regarding the identity and distribution of... more
Cyanobacteria are key microbes in topsoil communities that have important roles in preventing soil erosion, carbon and nitrogen fixation, and influencing soil hydrology. However, little is known regarding the identity and distribution of the microbial components in the photosynthetic assemblages that form a cohesive biological soil crust (biocrust) in drylands of Europe. In this study, we investigated the cyanobacterial species colonizing biocrusts in three representative dryland ecosystems from the most arid region in Europe (SE Spain) that are characterized by different soil conditions. Isolated cyanobacterial cultures were identified by a polyphasic approach, including 16S rRNA gene sequencing, phylogenetic relationship determination, and morphological and ecological habitat assessments. Three well-differentiated groups were identified: heterocystous-cyanobacteria (Nostoc commune, Nostoc calcicola, Tolypothrix distorta and Scytonema hyalinum), which play an important role in N an...
Research Interests:
Cyanobacteria are an important constituent of biocrusts, communities dominated by lichens, mosses and associated microorganisms, which are prevalent in drylands worldwide and that largely determine their functioning. Despite their... more
Cyanobacteria are an important constituent of biocrusts, communities dominated by lichens, mosses and associated microorganisms, which are prevalent in drylands worldwide and that largely determine their functioning. Despite their importance, there are large gaps in our knowledge of cyanobacteria associated to biocrusts, particularly in areas such as the Mediterranean Basin. We studied the diversity of these cyanobacteria in a gypsiferous grassland from Central Spain using both morphological identification after cultivation and genetic analyses with the 16S rRNA gene. Eight different morphotypes were observed, most of them corresponding to filamentous and one of them to unicellular cyanobacteria. We found cyanobacterial genera typical of biocrust communities, such as Microcoleus , Schizothrix or Tolypothrix , and N-fixing cyanobacteria as Scytonema or Nostoc . Genetic information allowed us to identify cultures belonging to recently described genera such as Roholtiella , Nodosilinea...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Earth Sciences, Cyanobacteria, Environmental Monitoring, Rivers, Water Pollution, and 12 moreSpain, Biological Sciences, Aquatic Ecosystem, Environmental Sciences, DNA fingerprinting, Environmental quality, Bacterial Diversity, Genetic variation, Water Microbiology, Ribosomal DNA, Environment Quality, and Environmental
Research Interests: Earth Sciences, Water quality, Kinetics, Hydrobiology, Environmental Change, and 13 moreBiological Sciences, Phosphorus, Seasonality, Environmental Sciences, Bacteria, Stream, Nutrient, Phosphodiesterase Inhibitors, North East, Water Quality, Biological Monitoring, Nutrient dynamics, and Seasonal change
RESUMEN La comunidad de cianobacterias bentónicas del arroyo Mediano (Comunidad de Madrid) está compuesta por 16 especies, de ellas, 4 pertenecen al orden de las Chroococcales, 9 al de las Oscillatoriales y 3 al orden Nostocales. Se han... more
RESUMEN La comunidad de cianobacterias bentónicas del arroyo Mediano (Comunidad de Madrid) está compuesta por 16 especies, de ellas, 4 pertenecen al orden de las Chroococcales, 9 al de las Oscillatoriales y 3 al orden Nostocales. Se han definido 7 ...
Research Interests:
Research Interests: Engineering, Cyanobacteria, Regulation, Gene expression, Heterogeneity, and 15 moreBiological Sciences, Concentration, Phosphorus, Bacteria, Analytical, Gene, Alkaline phosphatase, Bioavailability, Sample, CHEMICAL SCIENCES, Gen, Analytical and Bioanalytical Chemistry, Anabaena, Biological Availability, and Environment
Research Interests:
... por Arturo Elosegi Irurtia, Sergi Sabater i Cortés Árbol académico , 2009, ISBN 978-84-96515-87-1 , págs. 219-242. Fundación Dialnet. Acceso de usuarios registrados. Acceso de usuarios registrados Usuario. Contraseña. Entrar. Mi... more
... por Arturo Elosegi Irurtia, Sergi Sabater i Cortés Árbol académico , 2009, ISBN 978-84-96515-87-1 , págs. 219-242. Fundación Dialnet. Acceso de usuarios registrados. Acceso de usuarios registrados Usuario. Contraseña. Entrar. Mi Dialnet. ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
The Rivulariaceae are treated here as all the cyanobacteria which have trichomes with a marked taper and a basal heterocyst for much of their growth cycle. Molecular sequencing of Calothrix and Rivula ria shows that these are... more
The Rivulariaceae are treated here as all the cyanobacteria which have trichomes with a marked taper and a basal heterocyst for much of their growth cycle. Molecular sequencing of Calothrix and Rivula ria shows that these are heterogeneous and this probably also applies to Dichothrix and Gloeotrichia. The unispeci fi c Isactis has received little study, but is morphologically close to some Calothrix . These should all be treated as form-genera for ecological descriptive purposes until more sequencing studies have been made. Sacconema and Gardnerula are not considered distinct enough to be treated as distinct genera. Colony formation occurs by aggregation of hormogonia and this may lead to the inclusion of more than one genotype. The group as a whole occurs in environments with highly variable P concentrations, usually short periods of relatively high ambient P followed by much longer periods of low P; a few possible exceptions are discussed. Typically organic P exceeds inorganic P a...
Tesis doctoral inédita. Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Biología . Fecha de lectura: 23-04-08 Bibliogr.:p..220-246
Research Interests:
Changes in epilithic cyanobacterial communities were determined in a river characterized by variations in nutrient content. The cyanobacterial community composition of the upstream sites was different from that of the downstream... more
Changes in epilithic cyanobacterial communities were determined in a river characterized by variations in nutrient content. The cyanobacterial community composition of the upstream sites was different from that of the downstream communities, where anthropogenic influences lead to an increase in nutrients (principally soluble reactive phosphate, SRP). There was a general trend in downstream sites towards a decrease in species richness,