1,413 research outputs found
Progetto MemO. Studio e valorizzazione della ceramica greca e magno-greca in Veneto: sul tema della dispersione della ceramica apula
No full textA partire dalle linee programmatiche del Progetto MemO "La memoria degli oggetti. Un approccio interdisciplinare per lo studio, la digitalizzazione e la valorizzazione della ceramica greca e magno-greca in Veneto", il contributo indaga il tema della fortuna dei manufatti ceramici greci, fenomeno di ampia in Veneto, che contribuì in larga misura alla diffusione della cultura dell'antico e alla sua tradizione in età moderna. Se il processo di genesi delle collezioni storiche di ceramica greca e magno-greca in Veneto ha radici molto profonde, il contributo riserva un’attenzione specifica anche alla situazione del XX sec. quando, soprattutto a partire dal secondo dopoguerra, si osserva un forte incremento del fenomeno del collezionismo con una netta espansione del bacino degli acquirenti. Di tale fattore si coglie un evidente riflesso nelle espressioni del collezionismo della seconda metà del Novecento quando, nel secondo dopoguerra, in particolare la classe dei professionisti – medici, ingegneri, notai, avvocati, ma accanto a questi anche commercianti, impiegati di banca, insegnanti – si interessa all’antico, documentando la tendenza ad una sorta di “democratizzazione” del fenomeno, come riflesso di una società più egualitaria e simile nei suoi comportamenti
Sterols and fatty acids of the freshwater Myriophyllum verticillatum
No full textThe fatty acids and sterols of Myriophyllum verticillatum are reported. Only 4α-methyl sterols have been detected in free and esterified forms. 4α,24S-Dimethyl-5α-cholesta-7,25(27)-dien-3β-ol and 4α,24S-dimethyl-5α-cholesta-8(14),25(27)-dien-3β-ol have been isolated for the first time. The major fatty acids are 16:1, 16:2, 16:3 and two isomeric hydroxy 16:3. © 1989
New oxygenated sterols from the weed Eichhornia crassipes Solms
No full textThree novel sterols 1 - 3 with an uncommon hydroxyl function at C-4 have been isolated from the weed E. crassipes. The stereostructures of the compounds have been defined on the basis of spectroscopic data. Phytotoxicity test of the sterols revealed valuable biological activity against root seedling growth of radish. © 1991
Storia e testi della letteratura greca
No full textStoria della letteratura greca con antologia dei test
Stigmasterols from Typha latifolia
No full textSeveral free and acylglucosylated stigmasterols have been isolated from the aquatic plant Typha latifolia. The structures of three novel acylglucosylsterols have been assigned on the basis of spectroscopic data and by chemical modification studies. © 1990, American Chemical Society. All rights reserved
Physiological and oxidative stress responses of lettuce to cleomside A: a thiohydroximate, as a new allelochemical from Cleome arabica L.
No full textThe inclination toward natural products have led the onset for the discovery of new bioactive metabolites that could be targeted for specific therapeutic or agronomic applications. This study aimed to isolate bioactive compounds from Cleome arabica L., and subsequently determine the unexplored mechanism of action of the newly identified compounds on Lactuca sativa L. Chemical investigation of the ethyl acetate fraction of methanolic silique extract of C. arabica afforded seven secondary metabolites belonging to different classes such as flavonoids, triterpene, and a new thiohydroximate derivative, named cleomside A. Among phytotoxic assays, the growth of lettuce was totally inhibited by cleomside A compared to the other identified compounds. This effect was associated with the increased levels of electrolyte leakage, malondialdehyde, and hydrogen peroxide indicating disruption of membrane integrity and induction of oxidative stress. Activities of the antioxidant enzymes SOD, CAT, and APX were also elevated, thereby demonstrating the enhanced generation of reactive oxygen species upon identified allelochemical exposure. Thus, the changes caused by cleomside A described herein can contribute to better understanding the allelochemical actions of thiohydroximate and the potential use of these substances in the production of natural herbicides compared to the other identified flavonoids and triterpene
Dihydrobenzofuran neolignans from Arum italicum
No full textA mixture of two new enantiomeric dihydrobenzofuran neolignans has been isolated from Arum italicum. The structures have been determined on the basis of the physical data of the compounds. © 1994
Noi, eredi privilegiati della lingua greca
No full textL’articolo è un riconoscimento dell’importanza della lingua e della cultura greca quale
solido fondamento della lingua italiana e della civiltà moderna
Terpenoids and phenol derivatives from Malva silvestris.
No full textA sesquiterpene and a tetrahydroxylated acyclic diterpene as well as two known monoterpenes, 6 C13 nor-terpenes and 11 aromatic
compounds were isolated from the water extract of Malva silvestris. The structures of the compounds were determined by spectroscopic
NMR and MS analysis. Effects of these compounds on germination and growth of dicotyledon Lactuca sativa L. (lettuce) were studied in
the 104–107 M concentration range
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