1,721,045 research outputs found
Evidence for morphological and genetic divergence in Perinereis cultrifera (Polychaeta, Nereidae)from two habitats types at Elba Island
No full textTemporal genetic variation in a populations of Aphanius fasciatus (Cyprinodontidae) from a brackish-water habitat at Elba Island (Italy)
No full textGrowth of two-dimensional materials on non-catalytic substrates: h-BN/Au(111)
No full textThe growth of two-dimensional (2D) materials is a topic of very high scientific and technological interest. While chemical vapour deposition on catalytic metals has become a well developed approach for the growth of graphene and hexagonal boron nitride (BN), very few alternative approaches for synthesis on non-reactive supports have been explored so far. Here we report the growth of BN on gold, using magnetron sputtering of B in N-2/Ar atmosphere, a scalable method using only non-toxic reagents. Scanning tunnelling microscopy at low coverage shows primarily triangular monolayer BN islands exhibiting two 'magic' orientations on the Au(111) surface. Such rotational alignment of BN on Au (111) is surprising, given the expected weak binding and the high lattice mismatch (similar to 14%) between BN and Au. Our observations are consistent with a strong coupling between the edges of BN flakes and the substrate, which leads to the selection of BN orientations that maximize the orbital overlap between edge atoms and Au surface atoms. Diverse flake morphologies resembling the shape of butterflies, six-apex stars and diamonds, implying alternating B- and N-terminated edges, are observed as well. Our results provide insight into the growth mechanisms of 2D materials on weakly interacting and chemically inert substrates, and provide the basis for integrating other 2D materials with atomically precise graphene nanostructures synthesized from molecular precursors on Au
Genetic structure of Norway lobster, Nephrops norvegicus (L.) (Crustacea: Nephropidae), from the Mediterranean Sea
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Allozymic genetic divergence in the bivalve Mytilaster minimus from brackish-water and marine habitats in the western sardinian coast (Italy)
No full textEvidence for high level of genetic divergence between populations of the bivalve Mytilaster minimus from a brackish environment and two adjacent marine sites
No full textMytilaster minimus (Poli, 1795) (Mytilidae) is a small bivalve (maximum shell length = 20 mm) distributed on many hard bottoms of the intertidal zone in the Mediterranean and eastern Atlantic. The species has a planktonic larval stage, but larval morphology and life-span are unknown, so that its potential for dispersal cannot reliably be inferred. Individuals from brackish and marine waters are morphologically indistinguishable. The purpose of the present study was to investigate the genetic structure of M. minimus from the Orbetello Lagoon (Tuscany, Italy) and two adjacent marine sites
Studio della variabilità genetica di Mytilaster minimus. (Mollusca, Pelecypoda) nella laguna di Orbetello e in due habitat marini adiacenti
No full textGoing 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
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