1,721,029 research outputs found
La riforma della PAC e le imprese agricole del Veneto: situazione e prospettive
No full textNel presente lavoro si è compiuta una verifica empirica di alcune conseguenze della nuova Pac mediante l’applicazione di un modello econometrico. In particolare, prendendo in considerazione un campione di aziende venete aderenti alla RICA (Rete di Informazione Contabile Agricola) nel periodo 1990-1995, si sono stimate le variazioni dell’offerta delle imprese agricole in seguito alla riforma sui seminativi (reg. 1765/92). Successivamente, utilizzando i risultati dell’analisi empirica, sono state compiute alcune simulazioni riguardanti i possibili cambiamenti della politica agricola comunitaria e internazionale del prossimo futuro
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
L'impatto della proposta Santer sulle grandi colture
No full textAl di là delle diverse interpretazioni ed evoluzioni del documento
«Agenda 2000» presentato da Jacques Santer
sembra delinearsi con chiarezza una prospettiva comunque
negativa per le aziende a indirizzo ceralicolo-industriale
con effetti significativi soprattutto in termini di
redditività. Da alcune simulazioni in aziende del Veneto
emerge una diminuzione della plv che può superare il milione
di lire per ettar
Activity of 3-Carbethoxyangelicin Photolysis Products
No full text3-Carbethoxyangelicin (3-CA), carrying an electron-withdrawing group at the pyrone side, has been prepared to have a fully monofunctional
angelicin derivative. 3-CA does not photoreact with DNA and induces a moderate antiproliferative activity. 3-CA proved to be extremely
sensitive to ultraviolet A (UVA) light, undergoing rapid photolysis. Only one photolysis product has been isolated and identified. By means
of alkaline elution, we observed that 3-CA and its photolysis products are able to induce a large amount of single-strand breaks in DNA in
vivo. The results obtained from studying the capacity to produce singlet oxygen suggest that the photodynamic mechanism of action of 3-CA
very likely results from its capacity--as well as that of its photolysis products--to produce singlet oxygen
Gli effetti di Agenda 2000 sull'agricoltura ecocompatibile
No full text(CAB Abstract Accession Number 981805077
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