1,721,046 research outputs found
Plastic detection in the sediments of Lambro River (North Italy): a preliminary study
No full textL'inquinamento da plastica rappresenta un problema globale emergente e le
acque dolci contribuiscono in modo massiccio alla contaminazione da plastica a livello
oceanico. Per questo motivo, l'obiettivo del presente studio preliminare è stata la valuta-
zione della presenza di plastiche nei sedimenti del fiume Lambro, un affluente del fiume
Po che attraversa una delle principali aree industrializzate del Nord Italia. I sedimenti
sono stati raccolti utilizzando una benna Van Veen e le plastiche sono state separate da
questa matrice complessa attraverso un'estrazione densimetrica. In particolare, abbiamo
confrontato l'efficienza di estrazione di due soluzioni ipersaline di cloruro di sodio (NaCl;
densità di 1,2 g/cm 3
) e cloruro di zinco (ZnCl 2; densità di 1,6 g/cm 3
). I risultati ottenuti
hanno evidenziato la presenza di plastiche nei sedimenti del Lambro e una differenza
statisticamente significativa (p < 0,05) nella capacità di estrazione delle soluzioni consi-
derate, con 8,3 ± 10,4 plastiche/Kg di sedimenti wet weight (w.w.), estratti dalla soluzione
di NaCl, e 53,3 ± 16,1 plastiche/Kg sedimenti w.w. estratti con ZnCl 2. Questo studio pre-
liminare rappresenta la prima evidenza di plastiche nei sedimenti del fiume Lambro e
mette in risalto l'importanza di utilizzare soluzioni ad alta densità, come ZnCl 2, nel pro-
tocollo di estrazione della plastica. Altri studi sono necessari per confermare questa evi-
denza e per caratterizzare a fondo questo tipo di inquinamento in una matrice, come i
sedimenti, ancora poco indagata.Plastic pollution represents an emerging global problem, and freshwaters mas-
sively contribute to the ocean plastic contamination. For this reason, the aim of this pre-
liminary study was the evaluation of the plastic presence in the sediments of Lambro
River, a tributary of the Po River, which crosses one of the main industrialized areas of
North Italy. Sediments were collected using a Van Veen grab and plastics were separated
from this complex matrix through a density extraction. In particular, we compared the
extraction efficiency of two hypersaline solutions of sodium chloride (NaCl; density of
1.2 g/cm 3) and zinc chloride (ZnCl 2; density of 1.6 g/cm 3
). Obtained results highlighted
the presence of plastics in the Lambro sediments, as well as a significant difference (p <
0.05) in the extraction performance of selected solutions, with 8.3 ± 10.4 number of plas-
tics/Kg sediments wet weight (w.w.), extracted by NaCl solution, and 53.3 ± 16.1 number
of plastics/Kg sediments w.w. extracted by ZnCl 2 solution. This preliminary study repre-
sents the first evidence of plastics in the Lambro River sediments and highlights the im-
portance to use high-density solutions, as ZnCl 2, in the plastic extraction protocol. Other
studies are needed to deeply characterize this type of pollution in a matrix, as sediments,
still poorly investigated
Sbarberi F., Pensatori e culture politiche del Novecento italiano e dintorni, Arezzo, Edizioni Helicon, 2018, pp. 299
No full textNel volume recensito Franco Sbarberi sottopone ad analisi le grandi stagioni di transizione politica del XX secolo e propone una nuova categorizzazione delle culture politiche italiane del Novecent
Labriola d'un siècle à l'autre, sous la direction de Georges Labica et Jacques Texier Antonio Labriola nella cultura europea dell'Ottocento, sous la direction de Franco Sbarberi Franco Sbarberi, Ordinamento politico e sociètà nel marxismo di Antonio Labriola Antonio Labriola, Lettere inedite (1862-1903), par les soins de Stefano Miccolis
No full textGianinazzi Willy. Labriola d'un siècle à l'autre, sous la direction de Georges Labica et Jacques Texier Antonio Labriola nella cultura europea dell'Ottocento, sous la direction de Franco Sbarberi Franco Sbarberi, Ordinamento politico e sociètà nel marxismo di Antonio Labriola Antonio Labriola, Lettere inedite (1862-1903), par les soins de Stefano Miccolis. In: Mil neuf cent, n°8, 1990. Les correspondances dans la vie intellectuelle. pp. 185-191
[Therapeutic efficacy of mepartricin in the medical treatment of prostatic hypertrophy]
No full textFifteen patients in various stages of benign hypertrophy of the prostate were treated with mepartricin (SPA-S-160). Three tablets a day were given for a standard period of 60 days. The pharmacological effect of the drug was assessed both by traditional techniques and modern instrumental examinations like transrectal echography and urodynamic analysis. All 15 patients were studied on the basis of a protocol that incorporated standard diagnostic surveys before the start of treatment, numerous tests after 30 days and at the end of treatment. The overall clinical result was more than satisfactory especially in terms of the reduction in the frequency of daily and nightly urination. The echographic and urodynamic results were less spectacular. The drug was extremely well tolerated
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
Behind conventional (micro)plastics: An ecotoxicological characterization of aqueous suspensions from End-of-Life Tire particles
Full text linkMillion tons of tires become waste every year, and the so-called End-of-Life Tires (ELTs) are ground into powder (ELT-dp; size < 0.8 mm) and granules (ELT-dg; 0.8 < size < 2.5 mm) for recycling. The aim of this study was to evaluate the sub-lethal effects of three different concentrations (0.1, 1, and 10 mg/L) of aqueous suspensions from ELT-dp and ELT-dg on Danio rerio (zebrafish) larvae exposed from 0 to 120 h post-fertilization (hpf). Chronic effects were assessed through biomarkers, real-time PCR, and proteomics. We observed a significant increase in swimming behavior and heart rate only in specimens exposed to ELT-dp suspensions at 1 and 10 mg/L, respectively. Conversely, the activities of detoxifying enzymes ethoxyresorufin-O-deethylase (EROD) and glutathione-S-transferase (GST) showed significant modulation only in specimens exposed to ELT-dg groups. Although no effects were observed through real-time PCR, proteomics highlighted alterations induced by the three ELT-dp concentrations in over 100 proteins involved in metabolic pathways of aromatic and nitrogen compounds. The results obtained suggest that the toxic mechanism of action (MoA) of ELT suspensions is mainly associated with the induction of effects by released chemicals in water, with a higher toxicity of ELT-dp compared to ELT-dg
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
Efficacia terapeutica della mepartricina nel trattamento medico della ipertrofia prostatica.
No full textAppropriate 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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