1,721,016 research outputs found
Spinipterus, a new genus of small, spiny catfish (Siluriformes: Auchenipteridae) from the Peruvian Amazon
No full textAkama, Alberto, Ferraris, Carl J. (2011): Spinipterus, a new genus of small, spiny catfish (Siluriformes: Auchenipteridae) from the Peruvian Amazon. Zootaxa 2992: 52-60, DOI: 10.5281/zenodo.20376
Fig. 3 in Myxiops aphos, new characid genus and species (Characiformes: Characidae) from the rio Lençóis, Bahia, Brazil
No full textFig. 3. Northeastern Brazil, showing the approximate position of the type locality of Myxiops aphos.Published as part of Zanata, Angela M. & Akama, Alberto, 2004, Myxiops aphos, new characid genus and species (Characiformes: Characidae) from the rio Lençóis, Bahia, Brazil, pp. 45-54 in Neotropical Ichthyology 2 (2) on page 48, DOI: 10.1590/S1679-62252004000200001, http://zenodo.org/record/541684
FIGURE 2 in A new species of Hemiodus Müller (Characiformes: Hemiodontidae) from the lower Rio Xingu, Brazil
No full textFIGURE 2. Hemiodus tucupi, live specimen, paratype, INPA 43494, 62.7 mm SL, Rio Xingu at middle portion of Volta Grande, Pará, Brazil. Photo by Mark Sabaj.Published as part of Silva, Ivanilza Da Silveira, Nogueira, Acácio Freitas, Netto-Ferreira, Andre Luiz, Akama, Alberto & Dutra, Guilherme Moreira, 2020, A new species of Hemiodus Müller (Characiformes: Hemiodontidae) from the lower Rio Xingu, Brazil, pp. 172-180 in Zootaxa 4751 (1) on page 176, DOI: 10.11646/zootaxa.4751.1.11, http://zenodo.org/record/371173
FIGURE 1 in A new species of Pimelodella (Siluriformes: Heptapteridae) from the Guiana Shield, Brazil
No full textFIGURE 1. Pimelodella humeralis, holotype, MPEG 34994, 77.4 mm SL. Brazil, Pará, Rio Jari basin, Rio Ipitinga. Left lateral (A) and dorsal (B) views.Published as part of Slobodian, Veronica, Akama, Alberto & Dutra, Guilherme Moreira, 2017, A new species of Pimelodella (Siluriformes: Heptapteridae) from the Guiana Shield, Brazil, pp. 85-100 in Zootaxa 4338 (1) on page 87, DOI: 10.11646/zootaxa.4338.1.4, http://zenodo.org/record/103557
Myxiops Zanata & Akama 2004, new genus
No full textMyxiops, new genus Type species. Myxiops aphos, by monotypy and present designation. Diagnosis. Myxiops is a characid genus of relatively small body size (maximum known SL 56.1 mm). The following combination of derived features distinguishes Myxiops from all other characid fishes: (1) infraorbitals fused in a unique fashion, resulting in less than six autogenous bones; (2) presence of a single tooth row in the premaxilla; (3) presence of “cheirodontin-like teeth”, somewhat pedunculated, expanded and compressed distally, with cusps similar in shape and perfectly aligned along dorsal margin; (4) ventral margin of toothed portion of maxillary curved towards the ventral margin of the premaxilla and maxillary teeth forming a continuous series with premaxillary teeth; (5) margins of pre- and postzygapophyses with projections anteriorly and posteriorly directed; (6) accumulation of epithelial cells forming globular structures distributed over head and scales; and (7) base of anal-fin without scales covering basal portion of unbranched and anterior branched rays. Etymology. Myxiops from the Greek, myxa for slime, and iops for small fish, in reference to the copious amount of mucous covering the body, which makes the fish very slippery when alive and even for some period after fixation in formalin and storage in alcohol.Published as part of Zanata, Angela M. & Akama, Alberto, 2004, Myxiops aphos, new characid genus and species (Characiformes: Characidae) from the rio Lençóis, Bahia, Brazil, pp. 45-54 in Neotropical Ichthyology 2 (2) on page 46, DOI: 10.1590/S1679-62252004000200001, http://zenodo.org/record/541684
FIGURE 1. Hemiodus tucupi, MPEG 36362 in A new species of Hemiodus Müller (Characiformes: Hemiodontidae) from the lower Rio Xingu, Brazil
No full textFIGURE 1. Hemiodus tucupi, MPEG 36362, holotype, 66.5 mm SL, Igarapé Bacajaí, Rio Xingu basin, Pará, Brazil.Published as part of <i>Silva, Ivanilza Da Silveira, Nogueira, Acácio Freitas, Netto-Ferreira, Andre Luiz, Akama, Alberto & Dutra, Guilherme Moreira, 2020, A new species of Hemiodus Müller (Characiformes: Hemiodontidae) from the lower Rio Xingu, Brazil, pp. 172-180 in Zootaxa 4751 (1)</i> on page 173, DOI: 10.11646/zootaxa.4751.1.11, <a href="http://zenodo.org/record/3711732">http://zenodo.org/record/3711732</a>
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
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