342 research outputs found
L'Object-Oriented Technology nell'industria del software: quali prospettive per le piccole e medie imprese del settore
No full textAmelia Rosselli Pincherle
No full textThe headword explains the biography and the contribution of the author Amelia Rosselli to the children's literatur
Volatile constituents of Scutellaria rubicunda Hornem subsp. linnaeana (Caruel) Rech. (Lamiaceae) endemic in Sicily
No full textComposition of essential oil of lemon thyme (Thymus × citriodorus) at different hydrodistillation times
No full textDistillation time can both to optimise the production and to engineer the composition of essential oil in essential oil bearing plants. Purpose of this study was to evaluate the effect of duration of hydrodistillation on composition of essential oil of Thymus × citriodorus, the natural source of commercially important geraniol and citral, a component with valuable biological properties. Essential oils were isolated by hydrodistillation at different distillation times and analysed by GC/MS analytical methods. Increase in percentage of essential oil during all hydrodistillation time gradient was uneven. Elongation of hydrodistillation time decreased percentages of monoterpenes but increased percentages of sesquiterpenes in essential oil. Results showed that the hydrodistillation of essential oil from lemon thyme longer than 60 min is useless
Sraffa and his arguments against 'marginism'
No full textThe subtitle of Sraffa's most celebrated work, Production of Commodities by Means of Commodities, is prelude to a critique of economic theory. Given that no later work was ever published by Sraffa, we are left to wonder what would have come after the prelude. This paper suggests that the core of the critique might have been the marginal method itself. By carefully distinguishing between published and unpublished work, we shows that Sraffa's opposition to the marginal method follows several threads, some of which were developed over a period of nearly 35 years, such as the belief that economic theory should use only measurable and observable magnitudes, the critique of the 'fundamental' symmetry between production and consumption, and the disagreement with the Marshallian concept of equilibrium. Although none of the arguments reached a stage that Sraffa considered satisfactory enough to be worth publishing, our reconstruction sheds light on his research programme and on otherwise rather obscure passages in his works. Copyright The Author 2010. Published by Oxford University Press on behalf of the Cambridge Political Economy Society. All rights reserved., Oxford University Press.
The ethnobotany, phytochemistry and biological properties of genus Ferulago – A review
No full textEthnopharmacological relevance: The genus Ferulago, belonging to the Apiaceae family, is found mainly in the Mediterranean area, Southwest and Middle Asia, the Caucasus and North Africa. Since ancient times, species of this genus have been largely employed in traditional medicine for their biological properties such as antimicrobial, anti-inflammatory, antispasmodic, insecticidal, and anti-malaria, cholinesterase inhibition effects, etc. Aims: The scope of this paper is to present a comprehensive respect review of this interesting genus including traditional uses, chemical composition of volatile and non-volatile metabolites, and in vitro and in vivo biological properties either utilizing the crude extracts or essential oils, or the single isolated compounds. Furthermore, critical considerations of the published data have been highlighted by comparing them with the results obtained from species of other genus belonging to the Apiaceae family. Materials and methods: The available information on these genera was collected from scientific databases and cover from 1967 up to 2020. The following electronic databases were used: PubMed, SciFinder, Science Direct, Scopus, Web of Science and Google Scholar. The search terms used for this review included Ferulago, all the botanical names of the species, both accepted names or synonyms, essential oils, volatile components, traditional uses, activity, pharmacology, and toxicity. No limitations were set for languages. A total of 230 articles were included in the present review. Results: Researches performed on either crude extracts, solvent fractions or isolated pure compounds from species of genus Ferulago showed several biological properties such as antibacterial, antifungal, antioxidant, antidiabetic, enzymatic, cytotoxic, anticancer, hepatoprotective, nephroprotective, antileishmanial, antimalarial, anticoagulant, anti-inflammatory, insecticidal, etc. Activities. Phytochemical investigations of Ferulago species have revealed that coumarins are the main constituents of the genera. A large number of flavonoids, terpenoids and other metabolites were also identified. Furthermore, a complete review on the essential oil composition of all the taxa studied so far has been also included. Conclusion: In the present study, we have provided scientific information and research developments on traditional uses, phytochemical profiles, biological activities and industrial practices on the Ferulago genus. The commercial use and the applications in agri-food sector of some of these species have been also considered. In fact, the various extracts and essential oils have been used as antioxidants and/or as antimicrobial agents, for the stabilization of sunflower and soybean oil, for food packagings, as antioxidants of mayonnaise and yogurt during their storage and, also, as economically valid source for obtaining single compounds, more expensive at a synthetic level
GC and GC-–MS Analysis of Volatile Compounds From Ballota nigra subsp. uncinata Collected in Aeolian Islands, Sicily (Southern Italy)
No full textIn the present study, the chemical composition of the essential oils from aerial parts of Ballota nigra subsp. uncinata (Bég.) Patzak collected in Sicily was evaluated by gas chromatography (GC) and GC-mass spectrometry. The main components of the oil were (E)-phytol (20.0%), α-pinene (9.0%), hexahydrofarnesyl acetone (5.7%), and α-selinene (5.1%). Cluster analysis of the essential oil compositions of all the taxa belonging to B. nigra s.l. group was performed
Chemical composition of essential oils of Anthemis secundiramea Biv. subsp. secundiramea (Asteraceae) collected wild in Sicily and their activity on micro-organisms affecting historical art craft
No full textIn the present study, the chemical composition of the essential oil from the aerial parts of Anthemis secundiramea Biv. subsp. secundiramea L. collected in Sicily was evaluated by GC and gas chromatography–mass spectrometry. The main components of A. secundiramea were (Z)-lyratyl acetate (14.6%), (Z)-chrysanthenyl acetate (9.9%), (Z)-chrysanthenol (8.7%) and (E)-chrysanthenyl acetate (7.7%). The comparing with other studied oils of genus Anthemis belonging to the same clade is discussed. Antibacterial and antifungal activities against some micro-organisms infesting historical art craft, were also determined
Volatile constituents of aerial parts of white salsify (Tragopogon porrifolius L., Asteraceae)
No full textTragopogon porrifolius L. grows as a vegetable in southern Italy and all parts of it are edible. In the present study the volatile components of the aerial part are described. Gas chromatography and gas chromatography-mass spectrometry analysis showed the presence of 38 components in all. On the whole, the volatile fraction was constituted mainly by carbonylic compounds (24.6%), phenols (21.5%) and fatty acids and esters (19.7%). The most abundant compounds were 4-vinyl guaiacol (19.0%), hexadecanoic acid (17.9%), hexahydrofarnesylacetone (15.8%) and hentriacontane (10.7%)
Essential oils of three species of scutellaria and their influence on Spodoptera littoralis
No full textThe recent literature about the essential oils of different species of Scutellaria have been reviewed (Skaltsa et al., 2000,
2005; Rosselli et al. (2007); Formisano et al. (2011). As far as we know, there is no report on the chemical composition of S.
brevibracteata. Recently Raccuglia et al. (2010) isolated seven neo-clerodane diterpenoids from S. hastifolia, three of which
showed significant antifeedant activity against Spodoptera littoralis. No studies have been carried out on the volatile constituents of the aerial parts of these two species, while the essential oil of S. orientalis ssp. alpina has been described
(Formisano et al., 2011).
Recently, the chemical composition of the essential oil of Scutellaria rubicunda Hornem. ssp. linnaeana (Caruel) Rech. has
been reported, along with its effect on the feeding and egg laying behaviour of S. littoralis (Rosselli et al., 2007). As a continuation of our studies on species of Scutellaria (Bruno et al., 1996, 1998; Raccuglia et al., 2010), we describe the volatile
compounds in the essential oils of S. brevibracteata, S. Hastifolia and S. orientalis ssp. alpina as well as their activity against the
feeding and egg laying behaviour of S. littoralis
- …
