1,720,962 research outputs found
CONSERVAZIONE INTEGRATA DI UNA PIANTA RARA E MINACCIATA E DELLA COMUNITA' DEI SUOI IMPOLLINATORI SELVATICI: PROGETTO LIFE+ PP-ICON (LIFE09/NAT/IT/000212)
No full textIl progetto PP-ICON (Plant Pollinator Integrated CONservation approach: a demonstrative
proposal) è un progetto LIFE+ Biodiversità della durata di 4 anni incentrato sulla conservazione
integrata di una pianta localmente rara, Dictamnus albus L., e sulla comunità dei suoi impollinatori.
Il sito di intervento si trova all'interno di un’area protetta della provincia di Bologna (Parco
Regionale dei Gessi Bolognesi e Calanchi dell'Abbadessa), che è anche un sito di interesse
comunitario (SIC-ZPS IT4050001 Rete Natura2000).
Le azioni si concentrano in quattro ambiti principali: gestione dell'habitat, salvaguardia degli
impollinatori, sensibilizzazione degli stakeholders e divulgazione. Gli interventi sull’habitat sono
consistiti nella creazione di schiarite boschive, al fine di ristabilire le migliori condizioni ambientali
per la persistenza della pianta, che soffre per la chiusura del bosco. Sono stati individuati gli
impollinatori effettivi del dittamo, al fine di fornire loro siti di nidificazione idonei, e alcune specie
di bombi sono state allevate artificialmente e reintrodotte nella zona. Il sostentamento degli
impollinatori è stato anche favorito dall'incremento delle fonti mellifere, ossia della flora spontanea
necessaria a fornire loro nettare e polline. A tale scopo sono state scelte 16 specie già presenti
nell'area e con una fioritura scalare, per garantire la presenza di fonti alimentari per tutto il periodo
di sviluppo degli insetti. Il successo delle azioni di conservazione viene valutato attraverso il
monitoraggio periodico della fitness della pianta e della diversità degli impollinatori.
Dopo tre anni dall'inizio del progetto la gestione del bosco ha dato esito positivo, con un incremento
della luce incidente nelle due aree di taglio di rispettivamente 5 e 2 volte rispetto alle due aree di
controllo, e un aumento di 6 volte del numero di piante fiorite. L'introduzione di 6 gruppi di nidi
artificiali ha avuto successo per diverse specie di api solitarie (es. varie Megachilidae e Xylocopa
sp.), mentre i 10 nidi per bombi non sono stati colonizzati. Tuttavia, in tre anni, 17 colonie di
Bombus terrestris sono state allevate con successo in laboratorio e reintrodotte nella zona. Le piante
nettarifere trapiantate vengono assiduamente visitate dagli impollinatori selvatici e, anche se i dati
del monitoraggio indicano ancora una generale scarsità di fauna impollinatrice, vi è una relazione
positiva tra abbondanza degli impollinatori e diversità delle specie di fiori; nell’anno successivo
all’introduzione delle nettarifere infatti l’indice di Shannon è aumentato in media di 0,25 punti ogni
mese rispetto all’anno precedente.
Gli eventi di divulgazione, che si concentrano sul rapporto tra piante e impollinatori e sulle strategie
per la loro conservazione, hanno attirato un numero sempre crescente di persone negli anni del
progetto, contribuendo a sensibilizzare l'opinione pubblica sull'importante tema della conservazione
della biodiversità
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
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
Chemometrics for the Direct Analysis of Solid Samples by Spectroscopic and Chromatographic Techniques
No full textThe direct chemical analysis allows investigating samples without altering them, keeping the sample available for further analysis. For the qualitative investigation, analytical procedures like gas-chromatography, Raman microscopy, and Infra Red spectroscopy are available; however, the univariate approach is not exhaustive in the case of very complex matrices. The quantitative approach is still an open issue, due to the strong matrix effect hindering the creation of univariate calibration methods in interpolation mode. The multivariate analysis may be the solution.
Three-way Principal Components Analysis (PCA) allows for comprehension of variables influencing classification. The Partial Least Squares regression (PLS) combined with Discriminant Analysis (DA) allows classifying. Multivariate standard addition calibration based on PLS coupled with Net Analyte Signal (NAS) calculation allows bypassing the matrix effect in quantitative analysis.
This Chapter is focused on the issues mentioned above. Three sections will be presented:
SECTION 1: three-way PCA is applied to the discrimination among bacterial species in samples analyzed as such by pyrolysis gas chromatography-mass spectrometry. Applications to timely analysis of pathogenic microbes are foreseen.
SECTION 2: PLS-DA is applied to Raman spectra to discriminate adulterated beeswaxes from natural ones. This procedure may be implemented to prevent possible adulteration of bees’ products.
SECTION 3: PLS-NAS is applied to ATR spectra to quantify biogenic silica in marine sediments. The new method allows to accurately study the time evolution of primary productivity in the Antarctic basins
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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