4,691 research outputs found
Mitochondrial DNA reveals genetic structuring of <i>Pinna nobilis</i> across the Mediterranean Sea
No full textPinna nobilis is the largest endemic Mediterranean marine bivalve. During past centuries, various human activities have promoted the regression of its populations. As a consequence of stringent standards of protection, demographic expansions are currently reported in many sites. The aim of this study was to provide the first large broad-scale insight into the genetic variability of P. nobilis in the area that encompasses the western Mediterranean, Ionian Sea, and Adriatic Sea marine ecoregions. To accomplish this objective twenty-five populations from this area were surveyed using two mitochondrial DNA markers (COI and 16S). Our dataset was then merged with those obtained in other studies for the Aegean and Tunisian populations (eastern Mediterranean), and statistical analyses (Bayesian model-based clustering, median-joining network, AMOVA, mismatch distribution, Tajima’s and Fu’s neutrality tests and Bayesian skyline plots) were performed. The results revealed genetic divergence among three distinguishable areas: (1) western Mediterranean and Ionian Sea; (2) Adriatic Sea; and (3) Aegean Sea and Tunisian coastal areas. From a conservational point of view, populations from the three genetically divergent groups found may be considered as different management units
Reply to Barris
No full textWe are grateful to Dr. Michael C. Barris for pointing out a resemblance between the subtle color gradients visible in Wassily Kandinsky’s 1916 painting (Fig. 1, below) and the assimilative watercolor spreading described by Pinna, B. (1987). Un effetto di colorazione. In V. Majer, M. Maeran, M. Santinello (Eds.), Il laboratorio e la cit
A single-azimuth pinna-related transfer function database
No full textPinna-Related Transfer Functions (PRTFs) reflect the modifications undergone by an acoustic signal as it interacts with the listener’s outer ear. These can be seen as the pinna contribution to the Head-Related Transfer Function (HRTF). This paper describes a database of PRTFs collected from measurements performed at the Department of Signal Processing and Acoustics, Aalto University. Median-plane PRTFs at 61 different elevation angles from 25 subjects are included. Such data collection falls into a broader project in which evidence of the correspondence between PRTF features and anthropometry is being investigated
m-Oxo and alkoxo complexes of gold(III) with 6-alkyl-2,2’-bipiridines. Synthesis, characterization and X-ray structures
No full textThe reactivity of a series of gold(III) adducts [Au(HL)Cl3] 1a–4a with 6-alkyl-2,29-bipyridines HL (N2C10H7R,
R = CH2Me 1, CHMe2 2, CMe3 3 and CH2CMe3 4) has been studied. The reactions of 1a–4a with silver(I) ions
or MeCO2Na afford cationic complexes [Au2(HL)2(m-O)2]21 1b–4b (as BF4 or PF6 salts) having the gold atom
bonded to the nitrogen atoms of the bipyridine and to two oxygen atoms. The crystal structure of 4b[PF6]2, solved
by X-ray diffraction, shows that the cation is a centrosymmetric dimer with two oxo (O22) groups bridging two
[Au{N2C10H7(CH2CMe3)-6}] moieties. In the case of 2a, besides the oxo species, mononuclear ionic derivatives
[Au(L*)Cl]1 2*c [HL* = N2C10H7(CMe2OH)-6; BF4, PF6 or AuCl4 salts] have been isolated. The latter complexes
contain an unexpected Au]O bond. The spectroscopic data and the crystal structure of 2*c[AuCl4] indicate a
tridentate N,N,O behaviour of the ligand which forms a [5,5]-fused ring system
Assessment of biochars obtained at two different pyrolysis temperatures to mitigate pollution due to Lumax®
No full textNew strategies, such as biochar soil amendment, are continuously developed to restore the agricultural environment from the adverse effects of agrochemicals. The sorption efficiency of a biochar depends on the specific raw materials and pyrolysis variables applied, such as temperature and heating time, that shape its physico-chemical properties. In this study, the sorption capacity of two biochars obtained from coppiced hardwoods at two different pyrolysis temperatures ( 6 5 0 C and 1100 C, denominated BCLT and BCHT, respectively) was assessed for Lumax®, a pre-emergence selective herbicide used for maize cultivation. Lumax® is composed of S-metolachlor (MTC), terbuthylazine (TBZ), and mesotrione ( M S T ) , therefore the sorption behaviour of active ingredients, alone or mixed as in the commercial formulation, was studied on two biochar samples to identify the best product to mitigate Lumax® pollution. Our results show that, although biochar performance depends on the physicochemicals properties of both the biochar and the pollutants, B C H T was the most suitable in retaining the Lumax® active ingredients, likely due to its high aromaticity
Porti e barriere frangiflutto come cause principali dell’erosione del litorale di alghero (NW-Sardegna, Italy).
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