Search results for "Logic"
showing 10 items of 33629 documents
Phosphorus limitation enhances parasite impact: feedback effects at the population level
2014
Background Nutrient deficiency affects the growth and population dynamics of consumers. Endoparasites can be seen as consumers that drain carbon (C) or energy from their host while simultaneously competing for limiting resources such as phosphorus (P). Depending on the relative demands of the host and the parasite for the limiting nutrient, intensified resource competition under nutrient limitation can either reduce the parasite’s effect on the host or further reduce the fitness of the nutrient-limited host. So far, knowledge of how nutrient limitation affects parasite performance at the host population level and how this affects the host populations is limited. Results We followed the popu…
Does differential iron supply to algae affect Daphnia life history? : An ionome-wide study
2019
The availability of iron (Fe) varies considerably among diet items, as well as ecosystems. Availability of Fe has also changed due to anthropogenic environmental changes in oceanic as well as inland ecosystems. We know little about its role in the nutrition of ecologically important consumers, particularly in inland ecosystems. Physiological studies in several taxa indicate marked effects of dietary Fe on oogenesis. We predicted that differential Fe supply to algae will impact algal Fe concentration with consequences on the life history of the freshwater grazer, Daphnia magna. We found that algal Fe concentration increased with Fe supply, but did not affect algal growth, indicating that the…
ATTIVITÁ DI RICERCA PER LO SVILUPPO DELLA ZOOTECNIA BIOLOGICA IN SICILIA
2008
Con l’intento di contribuire allo sviluppo del settore zootecnico biologico, gli autori hanno realizzato, attività di ricerca rivolte: - allo studio della possibilità di inserire, nella razione alimentare delle bovine e delle pecore in lattazione, fonti alternative al mais e alla soia, con la finalità di superare il problema degli OGM e di ridurre il rischio di contaminazione degli alimenti con micotossine; - alla valutazione degli effetti del carico animale al pascolo, finalizzato ad una maggiore efficienza produttiva dei sistemi pascolivi destinati agli ovini; - alla individuazione dei riflessi della dieta, variabile in funzione del concentrato utilizzato e del carico al pascolo, sulla qu…
“Status quaestionis” sulle «Egloghe» dantesche. A proposito di un recente volume
2022
Breve rassegna sullo stato delle edizioni delle «Egloghe» di Dante Alighieri e dei principali studi a esse dedicati, a proposito della pubblicazione del volume di A. Renker, Streit um Vergil. Eine poetologische Lektüre der “Eklogen” Giovanni del Virgilios und Dante Alighieris, Stuttgart 2021. Brief review on the state of the editions of Dante Alighieri’s «Eclogues» and the main studies dedicated to them, regarding the publication of the volume by A. Renker, Streit um Vergil. Eine poetologische Lektüre der “Eklogen” Giovanni del Virgilios und Dante Alighieris, Stuttgart 2021.
L'économie matérielle de la France (1830-2015). L'histoire d'un parasite ?
2018
This article explores the long-term dynamics of material use in France over a period of 185 years. It is based on material flow accounts that are perfectly consistent with the standards of Material Flows Analysis at the national economic scale. This work - which covers domestic extraction, imports and exports - is the first long-term study of material flows for France, with annual and national data for most of the period. Our database allows us to study the evolution of French metabolism during the industrialization of the country, together with the increasing dependence on abiotic materials. We highlight a singular metabolic trajectory: that of a state that benefits from successive world-s…
Obesity and survival in operable breast cancer patients treated with adjuvant anthracyclines and taxanes according to pathological subtypes: a pooled…
2013
Obesity is an unfavorable prognostic factor in breast cancer (BC) patients regardless of menopausal status and treatment received. However, the association between obesity and survival outcome by pathological subtype requires further clarification. METHODS: We performed a retrospective analysis including 5,683 operable BC patients enrolled in four randomized clinical trials (GEICAM/9906, GEICAM/9805, GEICAM/2003-02, and BCIRG 001) evaluating anthracyclines and taxanes as adjuvant treatments. Our primary aim was to assess the prognostic effect of body mass index (BMI) on disease recurrence, breast cancer mortality (BCM), and overall mortality (OM). A secondary aim was to detect differences o…
Chemical composition and biological activity of the essential oil of Ballota hispanica (L.) Benth. growing wild in Sicily
2015
Ballota L. comprises several relevant species largely used for their excellent therapeutic properties. Ballota hispanica (L.) Benth. is widely used in herbal medicine, and it is sold in herbalist shops for its sedative and antispasmodic properties. Considering its traditional medicinal use and the lack of scientific studies on the volatile components of this species as well as on its biological activities, in this study the chemical composition of the essential oil from aerial parts of B. hispanica, collected in Sicily, was evaluated by gas chromatography and gas chromatographyâmass spectrometry. α-Elemol was the most abundant component of the oil (10.9%), followed by α-ylangene (8.5%),…
Intraocular pressure and central corneal thickness in an old French population: The MONTRACHET study
2013
Purpose: To describe the distribution of intraocular pressure (IOP) and central corneal thickness (CCT) in an old French population. Methods: About 9000 individuals 65 years and older were included in the 3C cohort study since 1999 in 3 French cities (Bordeaux, Dijon and Montpellier). In Dijon, an additional ophthalmic examination was performed 10 years after the initial inclusions to assess the relation between systemic age-related diseases and eye diseases in the MONTRACHET Study (Maculopathy Optic Nerve nuTRition neurovAsCular and HEarT diseases). In this population-based stuy a thorough eye examination and a questionnaire were undertaken in each participant. Intraocular pressure (IOP) w…
Pour une anthropologie pragmatiste et plébéienne du patrimoine : un scenario contre-hégémonique
2019
À partir de plusieurs constats, le débordement des institutions patrimoniales, l’insistance de formes citoyennes ou plébéiennes des revendications d’attachements, la prégnance de la figure du vivant, la raréfaction du futur devant la perspective anthropocénique, ce texte voudrait jeter les bases d’un scénario contre-hégémonique du patrimoine : détaché des institutions d’État, loin du marché et de sa logique néo-libérale, engagé dans des expériences de problèmes publics, sensible à la pluralité ontologies et des modes de connaissance… Some preliminary observations: too much is now asked of heritage institutions; new citizens’ and plebeian forms are emerging of asserting attachments; life-sci…
Contribution de l'albumen au développement de la graine chez Medicago truncatula : caractérisation d'un facteur de transcription de type DOF exprimé …
2014
In the current context, which necessitates a reduction in inputs in crop systems and boosting of production of plant proteins to reduce France’s dependency on feed imports,, growing legumes represents an alternative. Grain legumes are major sources of proteins for animal and human nutrition. In the UMR1347 Agroécologie, the objectives of the study group "déterminismes Génétiques et Environnementaux de l’Adaptation des Plantes à des Systèmes de culture Innovants" (GEAPSI) are to promote legume cultivation and adaptation to environmental stresses, via multidisciplinary approaches (genetics, ecophysiology, molecular physiology). This thesis project was carried out in the "Étude des Mécanismes …