Search results for " 16"

Archaea in boreal Swedish lakes are diverse, dominated by Woesearchaeota and follow deterministic community assembly

2020

Despite their key role in biogeochemical processes, particularly the methane cycle, archaea are widely underrepresented in molecular surveys because of their lower abundance compared to bacteria and eukaryotes. Here, we use parallel high‐resolution small subunit rRNA gene sequencing to explore archaeal diversity in 109 Swedish lakes and correlate archaeal community assembly mechanisms to large‐scale latitudinal, climatic (nemoral to arctic), and nutrient (oligotrophic to eutrophic) gradients. Sequencing with universal primers showed the contribution of archaea was on average 0.8% but increased up to 1.5% of the three domains in forest lakes. Archaea‐specific sequencing revealed that freshwa…

Wolbachia (alphaproteobacteria: rickettsiales) infections in isolated aphid populations from oceanic islands of the Azores archipelago: revisiting th…

2019

Aphids (Hemiptera: Aphididae) have provided a suitable model to study endosymbionts, their community, and dynamics since the discovery of the obligate endosymbiont Buchnera aphidicola in these organisms. In previous studies, Wolbachia was found in some aphid species. In the present study, we report the prevalence of Wolbachia in aphids sampled from a geographically isolated region (Azores Islands), aiming at a better understanding and characterization of the two newly reported supergroups, M and N. The description of the supergroup M was based on 16S rRNA as well as some protein-coding genes. However, the assignment of the supergroup N was according to 16S rRNA gene sequences of a very few …

Comparative genetic diversity of the narG, nosZ, and 16S rRNA genes in fluorescent Pseudomonads

2003

ABSTRACT The diversity of the membrane-bound nitrate reductase ( narG ) and nitrous oxide reductase ( nosZ ) genes in fluorescent pseudomonads isolated from soil and rhizosphere environments was characterized together with that of the 16S rRNA gene by a PCR-restriction fragment length polymorphism assay. Fragments of 1,008 bp and 1,433 bp were amplified via PCR with primers specific for the narG and nosZ genes, respectively. The presence of the narG and nosZ genes in the bacterial strains was confirmed by hybridization of the genomic DNA and the PCR products with the corresponding probes. The ability of the strains to either reduce nitrate or totally dissimilate nitrogen was assessed. Overa…

Compartmentalization of gypsum and halite associated with cyanobacteria in saline soil crusts

2016

The interface between biological and geochemical components in surface crust of a saline soil was investigated using X-Ray Diffraction (XRD), and variable pressure scanning electron microscopy (SEM) in combination with Energy Dispersive X-ray Spectrometry (EDS). Mineral compounds such as halite and gypsum were identified crystallized around filaments of cyanobacteria. A total of 92 genera were identified from the bacterial community based on 16S gene pyrosequencing analysis. The occurrence of the gypsum crystals, their shapes and compartmentalization suggested that they separated NaCl from the immediate microenvironment of the cyanobacteria, and that some cyanobacteria and communities of su…

Spatial patterns of bacterial taxa in nature reflect ecological traits of deep branches of the 16S rRNA bacterial tree

2009

International audience; Whether bacteria display spatial patterns of distribution and at which level of taxonomic organization such patterns can be observed are central questions in microbial ecology. Here we investigated how the total and relative abundances of eight bacterial taxa at the phylum or class level were spatially distributed in a pasture by using quantitative PCR and geostatistical modelling. The distributions of the relative abundance of most taxa varied by a factor of 2.5–6.5 and displayed strong spatial patterns at the field scale. These spatial patterns were taxon-specific and correlated to soil properties, which indicates that members of a bacterial clade defined at high t…

Unveiling the egg microbiota of the loggerhead sea turtle Caretta caretta in nesting beaches of the Mediterranean Sea

2022

Microbes have central roles in the development and health of animals, being the introduction of specific microbial species a potential conservation strategy to protect animals from emerging diseases. Thus, insight into the microbiota of the species and their habitats is essential. In this manuscript, we report for the first time the bacterial composition of all the components (eggshells of hatched and unhatched eggs, internal content of unhatched eggs, intestinal content of hatchling and pipping sea turtles, and sand) of three nesting beaches of Caretta caretta along the Italian coasts of the Mediterranean Sea. The analysis of 26 amplicon samples was carried out using next-generation sequen…

El venerable martir Pedro Borguny : [Se ganan 140 dias de indulgencia, contribuyendo con alguna limosna à la Causa pia de su Beatificacion]

Com a tít. propi el text del f. [3]. El subtít. pres dels fulls [1] i [2] Els f. de làm. són grav. xil. enmarcats, acompanyats de text en els fulls [1] i [2 Els f. orlats Sign.: [ ]2, [ ]1

Estudios del botánico Antonio Campillo Marco en la Universidad de Zaragoza

2018

Se ofrecen noticias sobre el nacimiento y el paso por la Universidad de Zaragoza del farmacéutico y botánico aragonés Antonio Campillo Marco, autor de numerosas obras de botánica, química, hidrología, aritmética o literatura, entre las que destaca su monumental manuscrito Orbe vegetale, en el que describe más de cinco mil especies de plantas. / Some news about the birth and the stay in the University of Zaragoza of the aragonese pharmacist and botanist Antonio Campillo Marco. He was the author of many works about Botany, Chemistry, Hidrology, Arithmetic or Literature, including his monumental handwritten work Orbe vegetale in which there are described over five thousand plant species.

Role of chronic exsposure to cigarette smoke on endoglin/CD105 expression in airway epithelium.

2015

Dysregulation of airway epithelial cell function related to cigarette smoke exposure plays an important role in the pathophysiology of COPD and is associated to tissue damage and disease severity. CD105 is a component of the receptor complex of TGF-β, a pleiotropic cytokine involved in cellular proliferation, differentiation and migration. CD105 regulates the expression of different components of the extracellular matrix suggesting a role of CD105 in cellular transmigration and remodeling processes. The aim of the present study was to investigate the expression of endoglin/CD105 in airway epithelium of COPD patients and its involvement in tissue remodeling and progression of COPD. We evalua…

Á la memoria de Calderón de la Barca en su segundo centenario (1881) : La Universidad de Valencia

1881

"Recuerdo [de] la Universidad de Valencia a los alumnos ... y á los concurrentes a la ... sesion literaria celebrada ... por la Universidad, el Ateneo científico y literario, el Instituto de segunda enseñanza, la Academia y Escuela de Bellas Artes y el Conservatorio de música" La vida es sueño