Search results for "bacteri"
showing 10 items of 5466 documents
Increased sulfate availability in saline water promotes hydrogen sulfide production in fish organic waste
2020
The risk of hydrogen sulfide (H2S) production can be a challenge in marine land-based recirculating aquaculture systems (RAS). Hydrogen sulfide is a toxic gas that can cause massive fish mortality even at low concentrations, and in addition, serious odour problems in the surroundings. It is a bacterial by-product originating from the degradation of organic matter in sulfur-rich waters such as marine waters. In order to hinder H2S production in marine land-based RAS, more information on the H2S production conditions and the associated microbiology is needed. In this study, the production of H2S from rainbow trout (Oncorhynchus mykiss) organic waste was examined using a novel H2S measurement …
Data from: Key roles for freshwater Actinobacteria revealed by deep metagenomic sequencing
2014
Freshwaters ecosystems are critical but fragile environments directly affecting society and its welfare. However, our understanding of genuinely freshwater microbial communities, constrained by our capacity to manipulate its prokaryotic participants in axenic cultures, remains very rudimentary. Even the most abundant components, freshwater Actinobacteria, remain largely unknown. Here, applying deep metagenomic sequencing to the microbial community of a freshwater reservoir, we were able to circumvent this traditional bottleneck and reconstruct de novo seven distinct streamlined actinobacterial genomes. These genomes represent three new groups of photoheterotrophic, planktonic Actinobacteria…
Bioenergy willow: protection from the negative impact of biological factors
2017
W rozdziale przedstawiono wyniki badań patologii bakteryjnych oraz grzybicowych wierzby, oraz szkodników i chwastów, które prowadzą do zaginięcia roślin lub znacznego spadku plonu biomasy plantacji energetycznych. Wyświetlono metody ochrony i zapobiegania.
Urban forest soils harbour distinct and more diverse communities of bacteria and fungi compared to less disturbed forest soils.
2022
Anthropogenic changes to land use drive concomitant changes in biodiversity, including that of the soil microbiota. However, it is not clear how increasing intensity of human disturbance is reflected in the soil microbial communities. To address this issue, we used amplicon sequencing to quantify the microbiota (bacteria and fungi) in the soil of forests (n=312) experiencing four different land uses, national parks (set aside for nature conservation), managed (for forestry purposes), suburban (on the border of an urban area) and urban (fully within a town or city), which broadly represent a gradient of anthropogenic disturbance. Alpha diversity of bacteria and fungi increased with increasin…
Estrategias de reducción del desarrollo de hongos toxigénicos en alimentos mediante compuestos naturales
2022
El desarrollo de hongos es una de las causas más habituales del deterioro de alimentos como son los cereales, sus productos derivados y el queso, por provocar cambios en las propiedades organolépticas y reducir el valor nutricional. Además, algunas especies son capaces de sintetizar micotoxinas, metabolitos altamente tóxicos que suponen un problema para la salud humana y animal. De forma tradicional se aplican sustancias fungicidas para disminuir la incidencia de mohos toxigénicos en los alimentos; sin embargo, la creciente preocupación de los consumidores por sus efectos tóxicos ha favorecido la búsqueda de alternativas que garanticen la calidad y seguridad alimentaria. Por ello en la pres…
Research data of an article: "Application of high resolution melting assay (HMR) to study temperature dependent infraspecific competition in an patho…
2017
Studies on species’ responses to climate change have focused largely on the direct effect of abiotic factors and in particular temperature, neglecting the effects of biotic interactions in determining the outcome of climate change projections. Many microbes rely on strong interference competition; hence the fitness of many pathogenic bacteria could be a function of both their growth properties and intraspecific competition. However, due to technical challenges in distinguishing and tracking individual strains, experimental evidence on intraspecific competition has been limited so far. Here, we developed a robust application of the high-resolution melting (HRM) assay to study head-to-head co…
Effect of seasonality on physico-chemical and microbiological properties of nicastrese milk and artisanal cheese
2021
ABSTRACT Nicastrese is an indigenous Italian goat breed reared in the Calabria region under semi-extensive practices. From January to June, the milk yield of 400 multiparous Nicastrese goats was evaluated. In addition, tank milk and ripened cheese samples were subjected to physico-chemical and microbiological analyses with the aim to assess the effect of the seasonality on quality parameters. The volatile organic compounds profile of the ripened Nicastrese cheese samples was evaluated. Results showed that the seasonality had a significant effect on milk fat, lactose, urea, citric acid contents and acidity. Microbiological analysis of tank milk samples revealed variability among the differen…
Serological and molecular identification of Legionella spp. isolated from water and surrounding air samples in Italian healthcare facilities
2016
Abstract Background Legionella is an intracellular microorganism living in natural and artificial aquatic environments. Although its transmission to humans is linked to the inhalation of contaminated aerosols, there is no validated air sampling method for the control and prevention of the disease. The aim of the present study was to provide more information on the distribution of Legionella spp. in indoor environments and to determine whether the same Legionella strains are isolated from air and water samples. Methods Ten healthcare facilities located in seven regions of Italy were enrolled. The serological typing of Legionella spp. from water samples and the surrounding air by active and p…
Genomic epidemiology: from transmission to the evolution of pathogenic microorganisms
2022
La epidemiología genómica ha revolucionado el mundo microbiano. Sus aplicaciones permiten conocer y comprender mejor el comportamiento, la transmisión y la evolución de los microorganismos. A pesar de su gran y reconocido potencial, su uso aún es limitado, especialmente en regiones en desarrollo. El principal objetivo de esta tesis fue estudiar y analizar los genomas completos de tres microorganismos patógenos y zoonóticos para comprender mejor su epidemiología, potencial patogénico y evolución. En el primer capítulo caracterizamos a nivel genómico a Salmonella enterica aislada de alimentos, fincas y muestras clínicas en Ecuador. Además, presentamos evidencia de la presencia de factores de …
Manual Projecte Micromón 2021-22
2021
Aquest manual forma part dels materials oficials utilitzats en el marc de la Small World Initiative™ (SWI). SWI és un programa innovador concebut per Jo Handelsman (Universitat de Yale, EUA) el 2012 per motivar els estudiants cap a l’elecció d’un grau en ciències experimentals, al mateix temps que aborda una amenaça per a la salut a escala global: la disponibilitat reduïda d’antibiòtics eficaços. SWI se centra en la idea d’un curs de biologia bàsic basat en el descobriment, en què estudiants de tot el món porten a terme treball de camp i investigació en el laboratori sobre mostres de sòl a la recerca de nous antibiòtics. Dos terços dels antibiòtics disponibles procedeixen de bacteris o fong…