Search results for "Bios"
showing 10 items of 2557 documents
Phenazine antibiotics produced by fluorescent pseudomonads contribute to natural soil suppressiveness to Fusarium wilt
2009
Natural disease-suppressive soils provide an untapped resource for the discovery of novel beneficial microorganisms and traits. For most suppressive soils, however, the consortia of microorganisms and mechanisms involved in pathogen control are unknown. To date, soil suppressiveness to Fusarium wilt disease has been ascribed to carbon and iron competition between pathogenic Fusarium oxysporum and resident non-pathogenic F. oxysporum and fluorescent pseudomonads. In this study, the role of bacterial antibiosis in Fusarium wilt suppressiveness was assessed by comparing the densities, diversity and activity of fluorescent Pseudomonas species producing 2,4-diacetylphloroglucinol (DAPG) (phlD+) …
La Betulla dell’Etna: uno studio multidisciplinare sui fattori di deperimento della specie
2018
La betulla dell’Etna (Betula aetnensis Rafin), è una delle specie arboree che durante le ultime glaciazioni si è spinta verso sud e dove oggi costituisce popolazioni pressoché relitte localizzate esclusivamente in Sicilia sulla sommità dell’Etna. I betulleti sono presenti sui versanti orientali ed occidentali dell’Etna, ad un’altitudine compresa tra 1.400 e 2.000 m s.l.m. Si tratta di popolamenti pionieri che colonizzano substrati vulcanici inalterati e/o poco evoluti dove costituiscono a volte dei piccoli boschi puri o misti a pino laricio. Questi boschi in passato erano sottoposti a ceduazioni, che dal 1987 non sono state più eseguite a seguito della istituzione del Parco Regionale dell’E…
Síntomas, signos y estadística: Aplicaciones de la estadística en ciencias de la salud y de la vida
2014
La determinación o constatación experimental de los mecanismos fisiológicos de las enfermedades suele ser una tarea muy compleja. Esto ha convertido a la epidemiología en la principal herramienta de generación de conocimiento en el ámbito médico. La epidemiología aprende sobre las enfermedades a partir de la observación de la salud en colectivos de personas, en lugar de la observación individual de éstas. Si la principal herramienta de generación de conocimiento médico se basa en la observación de colectivos de personas (muestras de una población) de las que querremos aprender (hacer inferencia), resulta claro el nexo entre la estadística y la medicina. A lo largo de este artículo ilustramo…
Mediterranean coccolith ecobiostratigraphy since the penultimate Glacial (the last 145,000years) and ecobioevent traceability
2015
The Mediterranean Sea is a miniature ocean ideal to test the response of marine ecosystems to amplified orbital and suborbital climate changes. Here we present coccolith data from a Sardinia Channel gravity core (Arcose C_33) analysed over the last 145,000 years, with a mean resolution of about 900 years. The study highlights that regional phytoplankton assemblages underwent significant modifications between the penultimate glacial and the last interglacial, as well as between the last glacial and the Holocene. The N ratio palaeoproductivity index suggests reduced productivity levels and the development of a deep nutricline during the last interglacial and the Holocene. Within the last glac…
Microorganisms and Biotic Interactions
2014
SPE IPM; Most ecosystems are populated by a large number of diversified microorganisms, which interact with one another and form complex interaction networks. In addition, some of these microorganisms may colonize the surface or internal parts of plants and animals, thereby providing an additional level of interaction complexity. These microbial relations range from intraspecific to interspecific interactions, and from simple short-term interactions to intricate long-term ones. They have played a key role in the formation of plant and animal kingdoms, often resulting in coevolution; they control the size, activity level, and diversity patterns of microbial communities. Therefore, they modul…
Huntingtin mediates dendritic transport of β-actin mRNA in rat neurons
2011
Transport of mRNAs to diverse neuronal locations via RNA granules serves an important function in regulating protein synthesis within restricted sub-cellular domains. We recently detected the Huntington's disease protein huntingtin (Htt) in dendritic RNA granules; however, the functional significance of this localization is not known. Here we report that Htt and the huntingtin-associated protein 1 (HAP1) are co-localized with the microtubule motor proteins, the KIF5A kinesin and dynein, during dendritic transport of β-actin mRNA. Live cell imaging demonstrated that β-actin mRNA is associated with Htt, HAP1, and dynein intermediate chain in cultured neurons. Reduction in the levels of Htt, H…
Winter male plumage coloration correlates with breeding status in a cooperative breeding species
2007
The function of colored ornaments is usually related to the signaling of individual quality in intra- and intersexual interactions. In cooperative breeding species, where only a fraction of the male population access the breeding status and the other fraction has the option to help breeding pairs, colored traits might provide the females with a reliable information on the quality of potential mate. Males of the cooperative breeding azure-winged magpies (Cyanopica cyanus) display conspicuous blue plumage coloration. Here we explored the role played by structural blue coloration of males and the probability of becoming a breeder or a helper. Birds were trapped during 4 consecutive years, and …
Evaluación del efecto de los selladores con base de biosilicatos en células madre de origen dental
2016
Objetivo: En esta tesis doctoral se investigó la biocompatibilidad in vitro de dos selladores endodónticos en base a silicato de calcio, MTA Fillapex y TotalFill BC Sealer, en las células madre del ligamento periodontal humano (hPDLSCs), comparando los resultados con un sellador a base de resina-epóxica (AH Plus). Metodología: Se utilizaron células madre del ligamento periodontal obtenidas de terceron molares sanos exodonciados. Se realizaron elusiones de los tres diferentes selladores endodónticos con medio de cultivo. La citotoxicidad de estas diluciones se evaluó usando el ensayo de MTT. Para determinar el efecto sobre la migración célular se utilizó un modelo in vitro de curación de her…
The employment situation of the graduates of the Italian Faculties of Agriculture
2010
No abstract
Detección de cambios anómalos mediante teledetección
2016
Este trabajo de fin de máster aborda el problema de la detección automática de cambios anómalos ocurridos en la superficie terrestre mediante imágenes satelitales de la Tierra. Dichos cambios implican cualquier variación fuera de lo típicamente esperado que se produzca en un área determinada del planeta. Su detección es muy importante dentro de las ciencias de la Tierra, ya que en el contexto actual de calentamiento global y cambio climático, presentan una importancia muy elevada en la escala global y local, permitiendo descubrir nuevos efectos generados por las actividades humanas que alteren el medio natural, y también posibles desestabilizaciones a gran escala entre los sistemas terrestr…