1,721,010 research outputs found
Essential oil composition and volatile profile of seven Helichrysum species grown in Italy
No full textHelichrysum genus consists of about 600 species widespread throughout the world, especially in South Africa and
in the Mediterranean area. In this study the aroma profile (HS-SPME) and the EO compositions of seven Helichrysum
species (H. cymosum, H. odoratissimum, H. petiolare, H. fontanesii, H. saxatile, H. sanguineum, and H. tenax) were
evaluated. All the plants were grown in Italy under the same growth conditions. The volatile constituents, particularly
monoterpenes, depended by the plant’s genotype and ecological adaptation. This study represents the first
headspace evaluation on the selected plants and the results evidenced that monoterpenes represented the main
class of constituents in five of the seven species analysed (from 59.2% to 95.0%). The higher content in
sesquiterpene hydrocarbons was observed in the Mediterranean species of H. sanguineum (68.0%). Only H. saxatile
showed relative similar abundance of monoterpenes and sesquiterpene hydrocarbons. The essential oil composition
of the majority of examined species are characterised by high percentage of sesquiterpenes (especially
b-caryophyllene and d-cadinene) ranging from 51.3% to 92.0%, except for H. cymosum, H. tenax, and H. sanguineum
leaves where monoterpenes predominated (from 51.7% to 74.7%)
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
Preliminary study of the Salvia collection in Hanbury Botanical Gardens
No full textSi riportano i risultati preliminari del lavoro di catalogazione effettuato presso i
Giardini Botanici Hanbury (Ventimiglia, Italia) delle specie di Salvia appartenenti alla
locale collezione. Il criterio seguito è stato quello fitogeografico, in base alle diverse
aree di origine, seguendo la sistematica del genere riformata da Alziar ed Hedge. Le
zone geografiche di biodiversità del genere sono sei: Stati centro-meridionali degli
U.S.A. e California, 40 taxa (17 in California); Messico, 300 taxa; Sud-America 210
taxa; Europa, Africa Mediterranea ed Asia Occidentale, complessivamente 210
taxa; Sud-Africa, 70 taxa; Asia Orientale, 90 taxa.
L’elenco dei taxa del genere Salvia L. riportato nel catalogo Hortus mortolensis,
pubblicato nel 1995 da Campodonico, è stato confrontato sia con i taxa presenti
attualmente, sia con quelli presenti nei cataloghi precedenti, allo scopo di verificare
se nel corso di oltre un secolo, l’acclimatazione di specie provenienti da altre zone
del mondo in questo Orto Botanico è stata efficace, e se quindi il clima ne consente
una coltivazione ottimale.
Sono state anche citate sinonimie evidenziate nel corso del tempo.
References
.Alziar, Gabriel: “Catalogue synonimique des Salvia L. du monde (Lamiaceae)" Biocosme, Revue
d’histoire naturelle, 5 (3-4)-1988 ; 6 (4)-1989 ; 9 (2-3)-1992 ; 10 (3-4)-1993.
Hedge, I.C. 1974: “A revision of Salvia in Africa including Madagascar and the Canary Island”.
Campodonico, Pier Giorgio; Orsino, Francesco; Cerkvenik, Cristina: 1995 “Enumeratio plantarum in
Horto Mortolensi cultarum” Microart’s Eds., Recco (Genova, Italy).
Erhardt, Walter; Götz, Erich; Bödeker, Nils; Seybold, Siegmund 2000: “Zander – Dictionary of plant
names’’ 16th edition. Eugen Ulmer GmbH & Co. Eds., Stuttgart, Germany.
Cronemeyer, Gustav 1889: “Systematic catalogue of plants growing in the open air in the garden of
Thomas Hanbury F.L.S.” Printed by G. A. Koenig, Erfurt.
Dinter, Kurt 1897: “Alphabetical Catalogue of Plants growing in the open air in the garden of Thomas
Hanbury F.L.S.” Printed by Waser Brothers, Genoa.
Berger, Alwin 1912: “Hortus mortolensis”. West, Newman & Co., Hatton Garden, London.
Ercoli, Mario; Lorenzi, Maurizio and Lady Hanbury O.B.E. 1938: “La Mortola Garden Hortus Mortolensis.”.
Oxford University Press. London: Humphrey Milford
Analysis of essential oil production in Salvia dolomitica plants cultured in vitro
No full textSalvia L. is the largest genus of Lamiaceae (or Labiatae) family with more than 900 species of which ca. 26 are native to southern Africa like S. dolomitica Codd an aromatic perennial shrub found in the northeast province of Transvaal (1). This sage is also drought resistant (2) and extremely fragrant. S. dolomitica essential oil (EO) has been used in traditional medicine to treat different disorder such as malaria, inflammation, microbial infections as well as sickness (3). Previously reported data confirmed good antiplasmodial and antiinflammatory activities (4), antimicrobial, antimycobacterial (2) and anticancer cell line specific (5) properties.
This study aims to establish protocols for in vitro manipulation of selected S. dolomitica plants for fast propagation, biomass production in controlled conditions and as genetic improvement support. Second objective is the characterization, in comparison with en plein air mother plants, of the in vitro essential oil and volatile components production and profile and the foliar morphology with particular care to secretory structures.
We obtained micropropagated plants, callus and cell line culture (Fig. 1) and after 5 weekly subcultures the FDA test demonstrated that cells were totally viable (Fig. 2) and that could be suitable for the establishment of transformation procedures as well as for scale up of biomass useful for metabolite production and extraction. Moreover, we evaluated the direct neo-organogenesis ability of S. dolomitica leaves. At the same time, we performed qualitative and quantitative phytochemical analysis of the essential oil of various cultivated plants. S. dolomitica in vitro-derived plantlets showed differences in the quali-quantitative composition of the essential oil compared to the open field grown plant. The investigation of the effect of high light treatments on volatile compounds compositions demonstrated that this stress can slightly affect the essential oils composition. The results suggest that tissue culture can be exploited by researchers to drive the accumulation of selected components of the essential oils
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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