A5063714335- Microbial Community Ecology and Physiology
- Genomics and Phylogenetic Studies
- Soil Carbon and Nitrogen Dynamics
- Evolution and Genetic Dynamics
- Bacteriophages and microbial interactions
- Gut microbiota and health
- Methane Hydrates and Related Phenomena
- Metabolomics and Mass Spectrometry Studies
- Protist diversity and phylogeny
- Vibrio bacteria research studies
- Legume Nitrogen Fixing Symbiosis
- Escherichia coli research studies
- Marine and coastal ecosystems
- Bacterial Genetics and Biotechnology
- Biocrusts and Microbial Ecology
- Bacterial biofilms and quorum sensing
- Polar Research and Ecology
- Plant and animal studies
- Plant Pathogens and Fungal Diseases
- Soil Geostatistics and Mapping
- Actinomycetales infections and treatment
- Mycorrhizal Fungi and Plant Interactions
- Yersinia bacterium, plague, ectoparasites research
- Soil and Unsaturated Flow
- Paleontology and Stratigraphy of Fossils
Universidad Nacional Autónoma de México
2016-2025
Instituto de Ecología
2016-2025
Instituto Antártico Chileno
2022-2025
Universidad Autónoma de la Ciudad de México
1994-2024
Hospital Infantil de México Federico Gómez
2022
Universidad Autónoma de Nuevo León
2020
Planta Piloto de Procesos Industriales Microbiológicos
2017
Consejo Nacional de Investigaciones Científicas y Técnicas
2017
Universidad Autónoma de Madrid
2011
Fundar
2008
The world's oceans contain a complex mixture of micro-organisms that are for the most part, uncharacterized both genetically and biochemically. We report here metagenomic study marine planktonic microbiota in which surface (mostly marine) water samples were analyzed as part Sorcerer II Global Ocean Sampling expedition. These samples, collected across several-thousand km transect from North Atlantic through Panama Canal ending South Pacific yielded an extensive dataset consisting 7.7 million...
The evolutionary significance of stress-induced mutagenesis was evaluated by studying in aging colonies (MAC) Escherichia coli natural isolates. A large fraction isolates exhibited a strong MAC, and the high MAC variability reflected diversity selective pressures ecological niches. depends on starvation, oxygen, RpoS adenosine 3',5'-monophosphate regulons; thus it may be by-product genetic strategies for improving survival under stress. could also selected through beneficial mutations that...
The Agave (Agavaceae) are keystone species of semiarid to arid regions where the geographic center origin is Mexico but whose populations spread from southwestern U.S. through Central America, Caribbean, and into northern South America. Our analyses indicate that a young genus, between 7.8 10.1 million years old, yet it harbors most any genera in family. Of eight family, paraphyletic with respect three them, these four often grouped genus termed sensu lato, which 208 293 recognized...
The Cuatro Cienegas basin in the Chihuahuan desert is a system of springs, streams, and pools. These ecosystems support >70 endemic species abundant living stromatolites other microbial communities, representing oasis high biodiversity. Here, we combine data from molecular microbiology geology to document biodiversity this unique environment. Ten water samples locations within two neighboring valleys as well three wet sediments were analyzed. phylogeny prokaryotic populations was determined...
ABSTRACT Current knowledge of genotypic and phenotypic diversity in the species Escherichia coli is based almost entirely on strains recovered from humans or zoo animals. In this study, we analyzed a collection 202 obtained 81 mammalian representing 39 families 14 orders Australia Americas, as well several reference strains; also included strain reptile 10 different birds collected Mexico. The were characterized genotypically by multilocus enzyme electrophoresis (MLEE) phenotypically...
Ancient biologically mediated sedimentary carbonate deposits, including stromatolites and other microbialites, provide insight into environmental conditions on early Earth. The primary limitation to interpreting these records is our lack of understanding regarding microbial processes the preservation geochemical signatures in contemporary microbialite systems. Using a combination metagenomic sequencing isotopic analyses, this study describes identity, metabolic potential chemical communities...
A series of competition experiments with two genotypes Escherichia coli showed that each genotype was favored when it the minority, allowing their coexistence in a stable polymorphism. In these experiments, glucose sole source carbon provided, and its concentration limiting to population density. Thus, polymorphism did not conform simple model competitive exclusion. similar also as resource, we considered hypotheses might explain observed coexistence: (1) strictly demographic trade—off, such...
Many bacterial species exhibit strong linkage disequilibrium of their chromosomal genes, which apparently indicates restricted recombination between alleles at different loci. The extent to reflects limited migration geographically isolated populations versus infrequent mixis genotypes within is more difficult determine. We examined the genetic structure Rhizobium leguminosarum biovar phaseoli associated with wild and cultivated beans (Phaseolus spp.) over several spatial scales, ranging...
The presence of Bacillus in very diverse environments reflects the versatile metabolic capabilities a widely distributed genus. Traditional phylogenetic analysis based on limited gene sampling is not adequate for resolving genus evolutionary relationships. By distinguishing between core and pan-genome, we determined functional relationships known Bacillus.Our upon twenty complete draft genomes, including newly sequenced isolate from an aquatic environment that report first time here. Using...
Summary 1. The effects of phosphorus enrichment and grazing snails on a benthic microbial community that builds stromatolic oncolites were examined in an experiment at Rio Mesquites, Cuatro Ciénegas, Mexico. Chemical analyses stream water samples indicated overall atomic ratios total nitrogen (N) to (P) approximately 110, indicating strong potential for P‐limitation growth. 2. Phosphorus involved addition 5 μ mol Na 2 HPO 4 L −1 streamside microcosms receiving intermittent inputs while...
The Cuatro Ciénegas Basin (CCB) in the central part of Chihuahan desert (Coahuila, Mexico) hosts a wide diversity microorganisms contained within springs thought to be geomorphological relics an ancient sea. A major question remaining answered is whether bacteria from CCB are marine that adapted oligotrophic system poor NaCl, rich sulfates, and with extremely low phosphorus levels (<0.3 microM). Here, we report complete genome sequence Bacillus coahuilensis, sporulating bacterium isolated...
Desferrioxamines are hydroxamate siderophores widely conserved in both aquatic and soil-dwelling Actinobacteria. While the genetic enzymatic bases of siderophore biosynthesis their transport model families this phylum well understood, evolutionary studies lacking. Here, we perform a comprehensive desferrioxamine-centric (des genes) phylogenomic analysis, which includes genomes six novel strains isolated from an iron phosphorous depleted oasis Chihuahuan desert Mexico. Our analyses reveal...
Phosphorus (P) plays a fundamental role in the physiology and biochemistry of all living things. Recent evidence indicates that organisms oceans can break down use P forms different oxidation states (e.g., +5, +3, +1, -3); however, information is lacking for from soil sediment. The Cuatro Ciénegas Basin (CCB), Mexico, an oligotrophic ecosystem with acute limitation, providing great opportunity to assess various strategies bacteria sediment obtain P. We measured activities exoenzymes involved...
The phylum Actinobacteria constitutes one of the largest and anciently divergent phyla within Bacteria domain. Actinobacterial diversity has been thoroughly researched in various environments due to its unique biotechnological potential. Such studies have focused mostly on soil communities, but more recently marine extreme also explored, finding rare taxa demonstrating dispersal limitation biogeographic patterns for Streptomyces. To test distribution populations a small scale, we chose...
Nutrient availability and ratios can play an important role in shaping microbial communities of freshwater ecosystems. The Cuatro Ciénegas Basin (CCB) Mexico is a desert oasis where, perhaps paradoxically, high diversity coincides with extreme oligotrophy. To better understand the effects nutrients on CCB, mesocosm experiment was implemented stoichiometrically imbalanced pond, Lagunita, which has average TN:TP ratio 122 (atomic). had four treatments, each five spatial replicates - unamended...
With more than 200 species, the genus Agave is one of most interesting and complex groups plants in world, considering for instance its great diversity adaptations. The adaptations include production a single, massive inflorescence (the largest among plants) where after growing many years, sometimes 30, rosette dies shortly afterward, remarkable coevolution with their main pollinators, nectarivorous bats, particular Leptonycteris . physiological species photosynthetic metabolism that allows...
ABSTRACT Bat rabies and its transmission to humans other species in Mexico were investigated. Eighty-nine samples obtained from rabid livestock, cats, dogs, studied by antigenic typing partial sequence analysis. Samples further compared with enzootic associated different of bats the Americas. Patterns nucleotide variation allowed definition at least 20 monophyletic clusters 9 or more bat species. Several lineages distinctive patterns found viruses related vampire Mexico. Vampire virus...
We used phylogenetic and population genetics approaches to evaluate the importance of evolutionary forces on shaping genetic structure Rhizobium gallicum related species. analysed 54 strains from several populations distributed in Northern Hemisphere, using nucleotide sequences three 'core' chromosomal genes (rrs, glnII atpD) two 'auxiliary' symbiotic (nifH nodB) elucidate biogeographic history species ecotypes (biovarieties) within The analyses revealed that classified as mongolense...
ABSTRACT Aim To assess the hypothesis that free‐living prokaryotes show a pattern of ‘no biogeography’ by examining scaling soil prokaryotic diversity and comparing it with other groups’ biogeographical patterns. Location Two sites in tropical deciduous forest Chamela, Jalisco, on western coast Mexico. Methods We examined distribution two 8 × m quadrats divided such manner we could sample at four spatial scales. Restriction fragment length polymorphisms 16S rRNA genes were used to define...