1,721,146 research outputs found
Atropisomeric Sulfur-compounds In Organic-synthesis - Generation and Reactions of the Carbanions of Dinaphtho[2,1-d-1',2'-f][1,3]dithiepine and Its Oxides
No full textOxidation of dinaphtho[2,1-d:1′,2′-f][1,3]dithiepine (2) gives a single diastereoisomeric sulphoxide (1) which reacts diastereospecifically with electrophiles at variance with the unoxidized substrate (2) and other combinations of oxides (4),(6), and (7) which afford diastereoisomeric mixtures of products
A four resistance loci pyramiding MAS scheme in barley
No full textThe most serious diseases for the barley crop in Southern Europe environments, where mildew and other leaf fungi have a relatively small or not significant effect on yields, are the soil-borne barley yellow mosaic virus (BaYMV), the aphid-borne barley yellow dwarf virus (BYDV) and the seed-borne fungus Pyrenophora graminea (leaf stripe). Developing barley cultivars resistant to the three diseases, while being an urgent objective of barley breeding, in a context of increasing organic farming for cereals, encounters several problems and cultivars resistant to all the former diseases are not yet available. The problems of barley breeding for resistance to BYDV are the availability of sources of resistance, mainly based on semi-dominant Yd2 gene, and the labour-intensive inoculation test made with infected aphids. Availability of resistant cultivars and inoculation test is easier for BaYMV and, in relative terms, also for leaf stripe. Indeed, in normal breeding schemes is quite difficult and anyway expensive to perform all resistance tests on the segregating progenies. For these reasons, it has been developed few years ago a "gene pyramiding" MAS (molecular-assisted selection) scheme to introduce four loci of resistance - two to leaf stripe, and one each to BYDV and BaYMV - into the elite winter barley cultivar Nure. Nure is in fact a highly yielding cultivar, adapted to Southern European environments, but lacking of most important resistances. STS and SSR markers have been adapted to the aim and applied to segregating progenies together with phenotypic selection for agronomic traits. The four loci have been introgressed successfully in couples at homozygosity into F3 families, for the final consolidation of the four into the Nure winter type background.In this work it is reported the molecular-assisted breeding history of the resistance gene pyramiding into this cultivar
M.Begala, G.Delogu and G.Podda HEADSPACE SPME/GC/MS IN THE ANALYSIS OF THE AROMA FRACTION OF CANNONAU OF JERZU WINE
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Povertà. L'Arca delle Virtù da Agostino al XXI secolo
No full textLa Povertà è una delle virtù effigiate nell’Arca di Agostino in Pavia. La donna che la impersona reca nella destra un ramo d’olivo e nella sinistra una palma e due tavolette rilegate. Sono attributi che non identificano immediatamente la statua con la virtù monastica della Povertà. Tuttavia, l’incertezza che coglie i visitatori del XXI secolo riguarda ben più che gli aspetti iconografici. La discussione a più voci di questo libro testimonia che l’associazione del termine virtù a quello di Povertà provoca stridore, obbliga a riflettere. Come va intesa la Povertà? La parola definisce solo l’ostacolo al progresso identificato dall’Onu? E come allora è potuta apparire tra le beatitudini evangeliche o divenire la “Madonna Povertà” di Francesco? La Povertà è un insulto alla dignità dell’uomo ovvero un cimento alla santità? O contiene una proposta spirituale più accessibile? Filosofi, storici, teologi e scienziati politici, nel contrasto delle loro risposte, fabbricano qui al lettore un’arca, di giunchi stavolta, per navigare tra i flutti di queste domande
La radice delle virtù: l'umiltà medievale tra discorso metaforico e disscussioni scolastiche
No full textL'umiltà, virtù specificamente cristiana assente dai sistemi morali del mondo antico gode per tutto l'altro Medioevo di una situazione di assoluto privilegio. Particolarmente apprezzata dal mondo monastico, essa rappresenta il fondamento e la radice di tutte le virtù, come illustra l'immagine dell'albero delle virtù particolarmente diffusa nel XII secolo. Spetta ai teologi scolastici (soprattutto Bonaventura da Bagnoregio e Tommaso d'Aquino) ridefinire il ruolo dell'umiltà nel quadro di un'etica rinnovata che deve misurarsi col sistema delle virtù aristoteliche riscoperte nell'Etica Nicomachea
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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