A5103245359- Microbial Community Ecology and Physiology
- Biocrusts and Microbial Ecology
- Algal biology and biofuel production
- Chromium effects and bioremediation
- Genomics and Phylogenetic Studies
- Marine and coastal ecosystems
- Protist diversity and phylogeny
- Aquatic Ecosystems and Phytoplankton Dynamics
- Microbial bioremediation and biosurfactants
- Heavy metals in environment
- Adsorption and biosorption for pollutant removal
- Hydrocarbon exploration and reservoir analysis
- Environmental DNA in Biodiversity Studies
- Marine Biology and Ecology Research
- Plant Pathogens and Fungal Diseases
- Legume Nitrogen Fixing Symbiosis
- Mycorrhizal Fungi and Plant Interactions
- Environmental Toxicology and Ecotoxicology
- Antibiotic Resistance in Bacteria
- Wastewater Treatment and Nitrogen Removal
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Plant Pathogenic Bacteria Studies
- Advanced Chemical Sensor Technologies
- Environmental remediation with nanomaterials
Universitat Autònoma de Barcelona
2010-2020
Museo Nacional de Ciencias Naturales
2013
University of Nariño
2013
Japan External Trade Organization
2004
The anaerobic zones of Lakes Cisó and Vilar (Banyoles karstic area, NE Spain) had mass developments purple sulfur bacteria during summer 1982. In Lake Vilar, Chromatium spp. was dominant (up to 92% the microbial biovolume). Cisó, predominant microorganisms were 71%) another bacterium forming aggregates (20%). bacterial layer could be divided according physiological state cells into a top part maximal specific activity, peak abundance, bottom inactive cells. in predominantly limited by light;...
Two kinds of predatory bacteria have been observed and characterized by light electron microscopy in samples from freshwater sulfurous lakes northeastern Spain. The first bacterium, named Vampirococcus , is Gram-negative ovoidal (0.6 μm wide). An anaerobic epibiont, it adheres to the surface phototrophic ( Chromatium spp.) specific attachment structures and, as grows divides fission, destroys its prey. important situ role can be inferred for direct counts natural samples. second Daptobacter...
Accurate studies of the pigment composition and isolation in pure cultures Chlorobiaceae from samples eight Spanish lakes show that there are two main coexisting groups green brown Chlorobium spp. represented respectively by limicola phaeobacteroides . Laboratory experiments with mixed isolated strains light quality plays a selective role on species among This selection depends which determines vivo absorption spectrum cells as well their ability to adjust intracellular concentration...
A photosynthetic microbial mat was investigated in a large pond of Mediterranean saltern (Salins-de-Giraud, Camargue, France) having water salinity from 70‰ to 150‰ (w/v). Analysis characteristic biomarkers (e.g., major fatty acids, hydrocarbons, alcohols and alkenones) revealed that cyanobacteria were the component pond, addition diatoms other algae. Functional bacterial groups involved sulfur cycle could be correlated these biomarkers, i.e. sulfate-reducing, sulfur-oxidizing anoxygenic...
Vertically stratified communities in a temporarily inundated sand flat at the Ebro Delta were studied. Three different microbial mats compared using light microscopy, scanning electron microscopy and pigment analysis. The youngest mat had less layers than wellestablished contained mostly filamentous cyanobaeteria belonging to genus Spiruliaa. Diatoms, as well coccoid cyanobacteria, could be found on surface of this mat. only pigmented layer present was green color main found, these oxygenic...
The spatio-temporal distribution of phototrophic communities the hypersaline photosynthetic Camarguc microbial mat (Salins-de-Giraud, France) was investigated over a diel cycle by combining microscopic and molecular approaches. Microcoleus chthonoplastes Halomicronema excentricum, dominant cyanobacteria this oxyphotrophic community, were observed with confocal laser scanning microscopy to determine their biomass profiles. Both bacteria have similar vertical distributions, varying from...
Size frequency distributions of different phototrophic and heterotrophic microorganisms were determined by means scanning transmission electron microscopy electronic particle sizing. Statistically significant differences existed among the three techniques used in this study. Cells processed for showed lower mean cellular volumes than those sizing, reflecting a shrinkage factors ranging from 1.1 to 6.2 (mean, 2.3). Processing cells caused higher processing microscopy. Shrinkage was dependent...
RESUMENSe estudiaron las comunidades estratificadas de microorganismos fotosintéticos que se encuentran en el Salar Llamará ubicado desierto Atacama, norte Chile, mediante métodos microscópicos y espectrofotométricos. El espesor la zona fótica los tapetes descritos varió entre 8 30 mm lo cual podría atribuirse a granulometría composición mineralógica sedimentos.Se diferencian tres tipos tapetes.El primero con una única capa pigmentada color verde; segundo capas colores verde naranja un...
Biomass has been studied as biomarker to evaluate the effect of heavy metals on microbial communities. Nevertheless, most important methodological problem when working with natural and artificial mats is difficulty changes produced microorganism populations that are found in thicknesses just a few mm depth.Here, we applied for first time recently published new method based confocal laser scanning microscopy image-program analysis determine situ Pb Cu stress cyanobacterial populations.The...
Environmental archives are needed to study the variability of natural systems and impact man on them. Microbial mats, modern homologues stromatolites, can be found in extreme environments such as Ebro River Delta were studied potential environmental atmospheric deposition. 210Pb, a radiotracer widely used geochronology studies, was both determine growth rates microbial mat from this environment estimate 210Pb flux northwestern Mediterranean Sea. The profile showed presence three distinct...
The velocity, run time, path curvature, and reorientation angle of Chromatium minus were measured as a function light intensity, temperature, viscosity, osmotic pressure, hydrogen sulfide concentration. C. changed both velocity time. Velocity decreased with increasing intensity in sulfide-depleted cultures increased sulfide-replete cultures. addition to grown at low (10 microeinsteins m-2 s-1) caused mean times increase from 10.5 20.6 s. high (100 decrease 15.3 7.7 These changes maintained...