Search results for "OMAS"
showing 10 items of 1725 documents
Relationship between N-cycling communities and ecosystem functioning in a 50-year-old fertilization experiment.
2009
The relative importance of size and composition of microbial communities in ecosystem functioning is poorly understood. Here, we investigated how community composition and size of selected functional guilds in the nitrogen cycle correlated with agroecosystem functioning, which was defined as microbial process rates, total crop yield and nitrogen content in the crop. Soil was sampled from a 50-year fertilizer trial and the treatments comprised unfertilized bare fallow, unfertilized with crop, and plots with crop fertilized with calcium nitrate, ammonium sulfate, solid cattle manure or sewage sludge. The size of the functional guilds and the total bacterial community were greatly affected by …
Poplar rotation coppice at a trace element-contaminated phytomanagement site: A 10-year study revealing biomass production, element export and impact…
2019
Abstract Growing lignocellulosic crops on marginal lands could compose a substantial proportion of future energy resources. The potential of poplar was explored, by devising a field trial of two hectares in 2007 in a metal-contaminated site to quantify the genotypic variation in the growth traits of 14 poplar genotypes grown in short-rotation coppice and to assess element transfer and export by individual genotypes. Our data led us to conclusions about the genotypic variations in poplar growth on a moderately contaminated site, with the Vesten genotype being the most productive. This genotype also accumulated the least amounts of trace elements, whereas the Trichobel genotype accumulated up…
Hydrolysis and microbial community analyses in two-stage anaerobic digestion of energy crops
2007
Aims: The roles of the diverse populations of micro-organisms responsible for biodegradation of organic matter to form methane and carbon dioxide are rudimentarily understood. To expand the knowledge on links between microbial communities and the rate limiting, hydrolytic stage of two-stage biogas production from energy crops, this study was performed. Methods and Results: The process performance. and microbial communities (as determined by fluorescence in situ hybridization) in two separate two-stage batch digestions of sugar beets and grass/clover were studied. The microbial populations developed in the hydrolytic stage of anaerobic digestion of beets and grass/clover showed very few simi…
Ozone-induced reductions in below-ground biomass: an anatomical approach in potato
2010
[EN] Potato plants were grown in open-top chambers under three ozone concentrations during two complete cropping seasons (93 and 77 d in 2004 and 2005, respectively). The effects of chronic exposure to ozone on leaf anatomy, cell ultrastructure and crop yield were studied. Severe cell damage was found, even at ambient ozone levels, mainly affecting the spongy parenchyma and areas near the stomata. Damage to the cell wall caused loss of cell contact, and loss of turgor pressure due to tonoplast disintegration, contributed to cell collapse. Phloem sieve plates were obstructed by callose accumulation, and damaged mesophyll cells increased their starch stores. Tuber yield fell sharply (24–44%),…
Said davanti al romanzo: da Mansfield Park al Gattopardo
2013
L'interazione degli studi culturali con la letteratura è stata sempre complessa, sospesa tra sviluppi significativi e pregiudizi fuorvianti. E' possibile verificarlo analizzando alcuni tra gli studi letterari di Edward Said, in particolare quelli in cui il critico si misura con un archetipo del geand romanzo moderno, Mansfield Park di Jane Austen e con una sua celeberrima, tardiva e ingannevole ripresa, Il Gattopardo di Tomasi di Lampedusa. The essay deals with the relationship between Cultural Studies and literature has always been complex, characterized both by meaningful developments and by misleading prejudices; especially analyzing the studies dedicated by Edward Said, to Jane Austen’s…
Análisis de la relación entre nuevas tecnologías y chino como segunda lengua: aplicaciones para teléfonos inteligentes y juegos
2017
Se ofrece un estudio sistemático y el análisis de la documentación más destacada y actual sobre la relación entre aprendizaje y enseñanza de una segunda lengua (L2), aplicada a la lengua china (CSL, chino como segunda lengua). Luego de repasar la trayectoria de los avances tecnológicos, en particular de las aplicaciones (apps) de telefonía celular y el diseño u oferta de juegos y simuladores para la enseñanza y el aprendizaje de CSL, se hace referencia a artículos e investigaciones especializados publicados en revistas internacionales, tanto sobre la lengua china como de lingüística y filología comparadas.
Globalización, valores sociales y choque de civilizaciones
2005
The thesis of the supposed clash of the Islamic and the western civilizations is, by far, the most diffused and debated of all the subjects and proposals dealt Huntington in his book <i>The Clash of Civilizations and the Remaking of World Order</i>, above all after the terrorist attacks of the September 11<sup>th</sup>. The results of the World Social Survey 2000-2001 directed by Inglehart, are used in the present article to test the thesis of the cultural differences in a wide sample of Western Christian and Islamic societies. The comparative analysis undertaken allows to conclude that the cultural differences between both group societies are quite important, althou…
Cutinases: Characteristics and Insights in Industrial Production
2021
Cutinases (EC 3.1.1.74) are serin esterases that belong to the α/β hydrolases superfamily and present in the Ser-His-Asp catalytic triad. They show characteristics between esterases and lipases. These enzymes hydrolyze esters and triacylglycerols and catalyze esterification and transesterification reactions. Cutinases are synthesize by plant pathogenic fungi, but some bacteria and plants have been found to produce cutinases as well. In nature they facilitate a pathogen’s invasion by hydrolyzing the cuticle that protects plants, but can be also used for saprophytic fungi as a way to nourish themselves. Cutinases can hydrolyze a wide range of substrates like esters, polyesters, triacylglycero…
The allelopathic capacity of submerged macrophytes shapes the microalgal assemblages from a recently restored coastal wetland
2013
Abstract We have tested the efficiency of isolated and combined submerged macrophyte cultures to inhibit, through allelopathy, the natural phytoplankton growth. Both plants and microalgae come from the same wetland, a recently restored area in Albufera de Valencia Natural Park (Spain). The need to replant the area under restoration with submerged macrophytes makes this information essential for wetland management. The selection and culture of the submerged macrophytes used in that restoration (four charophytes: Chara hispida , Chara vulgaris , Chara baltica , Nitella hyalina , and one angiosperm: Myriophyllum spicatum ) provided a good opportunity to test in the laboratory the allelopathic …
Phenotypic traits and establishment speed of 44 turf bermudagrass accessions
2014
Breeding of turf bermudagrass (Cynodon (L.) Rich.) has made available a broad range of turf varieties with unique morphological and growth traits. Rapid establishment is necessary in order to provide the performance of a mature turf cover in the shortest time possible. The aims of the research were: (1) to determine variation of growth, morphological and biomass traits in bermudagrass accessions belonging to different phenotypic groups during establishment and (2) to relate such variations to establishment speed in order to assess whether contrasting phenotypic traits could induce different establishment patterns in bermudagrass or if a general establishment predictor can be identified for …