1,721,004 research outputs found
LA VEGETAZIONE DEI MURI NEI CENTRI ABITATI DEGLI ALTIPIANI MAGGIORI D’ABRUZZO
Full text linkThe vegetation of the walls in the inner cities of the built-up areas of the Altipiani Maggiori d’Abruzzo has been analized by the phytosociological method. The study has lead to recognize 4 associations belonging to the alliance Cymbalario muralis-Asplenion rutae-murariae (Tortulo-Cymbalarietalia, Parietarietea judaicae), characterized by a main Central-European-Atlantic distribution. Two of the recognized associations are described for the first time in the Abruzzo region and one is new for Central and Southern Italy
An annotated checklist of the vascular flora of Majella National Park (Central Italy)
No full textThe Majella National Park is located in Abruzzo region (Central Italy) and covers an area of 740 Km2. An updated checklist
of the vascular plants growing in the park is here presented on the basis of extensive field surveys carried out from 1982 to
2018, analysis of relevant literature and review of herbarium specimens kept in APP, FI, NAP, RO, and Herb. Magellense.
The park’s flora amounts to 2,286 specific and subspecific taxa (including 11 hybrids), belonging to 118 families and 694
genera. According to our results, 201 taxa are endemic to Italy; 136 taxa are reported for the first time in the park, of which
two taxa are new for Abruzzo region; 73 taxa have not been confirmed in recent times and 42 are doubtfully occurring taxa.
The Park represents the southern or northern border of their Italian distribution of 137 taxa. Moreover, Poa ligulata is confirmed
for the flora of Italy. The non-native flora amounts to 110 taxa. The number of taxa recorded in the Majella National
Park is one of the highest in a protected area within the Mediterranean Basin
Coumarins and other components of Daphne oleoides Schreb. subsp. oleoides from Majella National Park
No full textThe present study reports about the phytochemical analysis of a sample of Daphne oleoides Schreb. subsp. oleoides
(family Thymelaeaceae) collected from the Majella National Park. Twenty components, belonging to different
classes of natural products, have been identified by means of spectroscopic and spectrometric techniques:
[monomeric (4), bis- (5, 7–10, 20) and trimeric coumarins (11), including aglycones and glycosides, coumarinolignoid
(6); flavonoids (16–19); glycosidic furolignans (14, 15), glucosidic phenylpropanoids (12, 13), cyclic
tetrapyrrole derivatives (2, 3), unsaturated triglyceride (1)]. Besides the chemosystematic markers of the genus
(4–10, 12, 14–18, 20) several other components were identified for the first time in the species (17, 20) and/or
in the Daphne genus (1–3, 13, 19). The observed composition was discussed from the chemotaxonomic standpoint
and compared with those recognized from a Sardinian accession. It was observed a pronounced difference
in the two metabolites patterns, most probably attributable to geographic isolation of the studied populations
and, in some extent, also by the different environmental conditions, evidencing a possible tendency of D. oleoides
to the infraspecific chemovariability. Considering the wide traditional uses of Daphne spp. in ethnomedicine of
several countries, also the pharmacologic potential of the identified secondary metabolites is discussed
Composizione molecolare della frazione polare di Ligusticum lucidum (Mill.)
No full textIl Ligusticum lucidum (Mill.) (sinonimo di Coristospermum lucidum (Mill.) Reduron, Charpin & Pimenov) noto anche col nome comune di Motellina lucida, è una pianta erbacea perenne indigena appartenente alla famiglia delle Apiaceae.
E’ caratterizzata da un fusto eretto e robusto, con foglie triangolari voluminose e lucide, ed infiorescenze strutturate in ombrelle composte da piccoli fiori bilobati di colore bianco. Il suo areale di distribuzione è individuato prevalentemente nel panorama montano dell’Italia settentrionale ed orientale ad altitudini comprese tra i 200 ed i 1500 m s.l.m., su pietraie e terreni aridi ad elevato coefficiente calcareo.
Non sono note proprietà specifiche inerenti la specie, mentre le piante appartenenti al genere Ligusticum sono note per le loro forti proprietà anti-infiammatorie ed analgesiche. Per questo, alcune varietà del genere, hanno avuto largo impiego nella medicina tradizionale cinese, in particolare nel trattamento del dolore e per la terapia di diversi tipi di disordini ematologici, quali ischemie e trombosi, in quanto tali specie sono in grado di incrementare il flusso sanguigno soprattutto a livello cerebrale.
In letteratura sono presenti diversi studi riguardanti la composizione della frazione polare e dell’olio essenziale di specie appartenenti al genere Ligusticum mentre risultano limitati gli studi fitochimici eseguiti sulla specie lucidum, riguardanti unicamente lo studio della composizione degli acidi grassi e la caratterizzazione delle cumarine e delle loro proprietà mediche.
Ciò rappresenta la ragione per cui abbiamo iniziato tale studio allo scopo di fornire una prima analisi esaustiva della composizione molecolare della frazione polare della specie.
L’analisi è stata condotta utilizzando tecniche estrattive, cromatografiche e spettroscopiche classiche quali estrazione con etanolo, cromatografia su colonna per la separazione dei composti, spettroscopia NMR e spettrometria di Massa per l’identificazione.
Lo studio dell’estratto della frazione polare del L. lucidum, ha evidenziato la presenza di sei composti quali 3'-acetil-4'-tigloil-khellattone (1), 3'-acetil-4'-diidro-tigloil-khellattone (2), luteolina (3), 7-{[2-O-β-D-glucopiranosil)-β-D-glucopiranosil]ossi}-5-idrossi-2-(3,4-diidrossi)-4H-1-benzopiran-4-one (4), acido clorogenico (5) e acido chinico (6) più altre sostanze naturali la cui struttura è ancora oggetto di studio.
I composti (1) e (2) che sono cumarine, rappresentano composti nuovi per il genere mentre sono già stati evidenziati nella famiglia e lo stesso vale per i composti (3) e (4) che sono flavonoidi ed anzi ne rappresentano i marker chemotassonomici. Infine, il composto (5) che è un acido caffeoil-chinico e l’acido chinico libero sono stati precedentemente identificati solo nel genere
Tracking the origin of silver fir plantations along the boundary between different genetic clusters in central Apennines: Implications for their management
No full textReforestation with native species determines that autochthonous populations and plantations are often within the reach of gene flow. To address efficient strategies for forest plantation management it is fundamental to track the origin of reforestation material, in order to limit potentially detrimental effects on the adaptive potential of autochthonous populations. The use of genetic information to determine the origin of plantations is very effective when historical data about reforestation programs are absent. The main objectives of our study were to assess the origin of silver fir plantations in the Majella National Park (Central Apennines) and to compare genetic diversity parameters between plantations and natural stands. The latter objective is particularly relevant to evaluate the levels of genetic variation in plantations of local origin and to evaluate their suitability as already established reforestation stands. A comprehensive genetic dataset (1619 individuals from 33 natural silver fir populations genotyped at 16 nuclear microsatellite markers) was built to characterize potential seed sources for 10 plantations from the Majella National Park. Their genetic origin was assessed through combining the results of Bayesian assignment tests and analyses of genetic differentiation. Based on the genetic structure characterizing natural populations, we were able to definitely assess the origin of most of the planted individuals. Five plantations were established using material which most likely originated in natural populations that are only 10â20 km distant. These plantations harbour levels of genetic variation similar to the surrounding natural populations and are, therefore, to be considered valuable local forest genetic resources. The other five plantations consist either partially or entirely of allochthonous individuals which are similar to Alpine and northern Apennine populations. To avoid exotic gene flow to nearby autochthonous populations, we suggest the removal of plantations in which allochthonous individuals are present before they reach sexual maturity. However, before taking such action, we recommend the monitoring of the relative performance of different provenances, i.e. plantations entirely made by either putatively autochthonous or undoubtedly allochthonous material. Such an investigation would allow a thorough ex post evaluation of past reforestation programs. To conclude, our results show that genetic data can provide essential information for general decision-making in forest plantations management and, considering the thorough characterization of silver fir genetic structure in this multi-refugial area, such information can be particularly useful for a correct management of Apennine plantations
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
A new pioneer association of detrital substrata of the hilly and low-mountain belts in Central Apennines (Italy)
Full text linkPlant communities dominated by Petrosedum ser. Rupestria in Italy have always been referred to the Sedo albi-Scleranthetea biennis Br.-Bl. 1955 class. This group of species was also often found more or less abundant in the garrigue and pasture vegetation. Some unusual plant communities dominated by Petrosedum rupestre (L.) P.V.Heath with a conspicuous presence of typical species of scree vegetation were found and sampled in the Abruzzo region, on more or less mobile debris. In order to classify such communities, syntaxonomic, structural, chorological and ecological analyses have been performed. All the Petrosedum ser. Rupestria dominated communities reported in Italy have been compared with the sampled vegetation. A new perennial pioneer association, linked to more or less mobile detrital substrata of the hilly and lower-mountane belts of the calcareous Central Apennines has been here described with the name Linario purpureae-Petrosedetum rupestris. Based on the syntaxonomic analysis, this association has been included in the Linarion purpureae alliance (Scrophulario bicoloris-Helichrysetalia italici order). The Linario-Petrosedetum has been divided into two subassociations: a typical one named petrosedetosum rupestris and a thermophilous one of the lower altitudes named teucrietosum flavi. The study revealed the originality of such communities and their appropriate classification in the Thlaspietea rotundifolii class. This is the first record in Italy of a Petrosedum ser. Rupestria-rich community framed in the scree vegetation class
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
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