1,720,971 research outputs found
Redescription of the nematode Philometra saltatrix Ramachandran, 1973 (Philometridae)from the type host Pomatomus saltatrix (L.)
No full textA new species of Moravecia (Nematoda: Dracunculoidea) from the body cavity of the marine perciform fish Percophis brasiliensis in Argentina
No full textA new species of dracunculoid nematode, Moravecia argentinensis n. sp. (Guyanemidae), is described from the blood vessels and body cavity of Brazilian flathead, Percophis brasiliensis Quoy et Gaimard (Perciformes: Percophidae), from off the coast of Argentina. The new species differs from the only other congeneric species, Moravecia australiensis Ribu et Lester, 2004, mainly in the number (14) of cephalic papillae, the length ratio of the muscular and glandular portions of esophagus (1:1-2), more numerous (3-5 pairs) genital papillae in the male, and the presence of a sclerotized copulatory plate. This is the second known species of Moravecia Ribu et Lester, 2004 and the first species of this genus reported from South American waters.Fil: Braicovich, Paola Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología; ArgentinaFil: Moravec, Frantisek. Academy of Sciences of the Czech Republic. Biology Centre. Institute of Parasitology; República ChecaFil: Timi, Juan Tomas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología; Argentin
Cucullanus robustus Yamaguti 1935
No full textCucullanus robustus Yamaguti, 1935 (Figs. 1, 2) General. Body whitish, medium-sized. Oral opening dorsoventrally elongated, narrow, surrounded by raised narrow membranous ala (collarette) and by row of numerous small buccal denticles. Two pairs of submedian cephalic papillae and pair of lateral amphids present. Oesophagus muscular, expanded at both ends; anterior expansion forming relatively large pseudobuccal capsule (oesophastome); posterior extension slightly narrower than oesophastome. Oesophagus opens into intestine through large oesophageal valves. Nerve ring situated approximately at one third of oesophagus from its anterior end. Deirids small, recurved at their tips, located near middle of oesophagus. Excretory pore slightly in front of or nearly at level of posterior end of oesophagus. Tail conical, sharply pointed at its end. Male (3 specimens). Body length 14.71 – 5.78 mm; maximum width 642–684. Length of entire oesophagus 1.43–1.51 mm (approximately 9.1–10.3 % of body length); its maximum width 233–304; minimum width 117–124. Length of oesophastome 319–332, representing 21–23 % of entire length of oesophagus. Distances of nerve ring and excretory pore 474–527 and 1.31–1.48 mm, respectively, from anterior extremity. Ventral preanal sucker well developed, oval, 329–332 in length. Spicules almost equal, 1.3–1.6 mm long, with membranous alae. Gubernaculum well sclerotised, 173–174 long and 10–12 wide. Eleven pairs of caudal papillae (including phasmids) present: 5 pairs preanal (all subventral), 1 pair adanal (lateral), 5 pairs postanal (3 subventral, 2 lateral). Of 5 pairs of preanal papillae, first and second pairs situated anterior and posterior to ventral sucker, respectively; fourth and fifth laid close to cloacal opening, and third papillae located at approximately two-third of distance from second pair of papillae to cloacal aperture. A single unpaired, median papilla-like structure present at level of fifth pair of preanal papillae, anterior to cloacal opening. Of 5 pairs of postanal papillae, first, second and fifth pairs subventral and third (phasmids) and fourth pairs lateral: first lies just posterior to cloacal line and the rest (2 nd– 5 th) located at posterior half of caudal length. Tail conical, 302–306 long, with pointed end. Female (6 specimens). Body length 18.18–24.48 mm, maximum width 649–965. Entire oesophagus 1.39–1.62 mm long (6–8 % of body length); maximum (at middle of oesophastome) and minimum widths (just posterior to nerve ring) of oesophagus 175–244 and 78–108, respectively. Pseudobuccal capsule 271–358 long (20–25 % of entire oesophagus). Distances of nerve ring, deirids, and excretory pore 482–534, 851 – 1039 and 1.24–1.41 mm, respectively. Vulva with rather elevated lips, situated at 11.1 –15.0 mm, 7.2–9.5 mm from anterior end (60–66 % of distance of the entire body length from anterior end). Uterus contains numerous thinwalled, oval eggs 76–84 long and 43–47 wide. Tail 409–524 long, with sharply pointed tip. Phasmids situated laterally at about mid-length of tail (Fig. 2 H). FIGURE 1. Cucullanus robustus Yamaguti, 1935 from Conger myriaster in Korea. A, B— anterior end of male, lateral and dorsoventral views, respectively; C— vulva; D— posterior end of male, ventral view; E— tail of female, lateral view; F— posterior end of male, lateral view; G – tail of male, lateral view; H— embryonated egg. Scale bars: A, B = 500 µ m; C, E = 100 µ m; D, G = 200 µ m; F = 300 µ m; H = 50 µ m. Host: Conger myriaster (Congridae, Anguilliformes). Site of infection: Intestine. Locality: Off southern coast of South Korea near Haenam City, Republic of Korea (collected in September 2005). Deposition of voucher specimens: Voucher specimens deposited in the Helminthological Collection of the Institute of Parasitology in Č eské Bud jovice (Cat. No. N- 884).Published as part of Park, Joong-Ki & Moravec, Frantisek, 2008, Redescription of Cucullanus robustus (Nematoda: Cucullanidae) from the conger eel Conger myriaster off Korea, pp. 1-7 in Zootaxa 1729 on pages 2-5, DOI: 10.5281/zenodo.18126
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
REDESCRIPTION AND SYSTEMATIC STATUS OF NEOCAPILLARIA PHOXINI YU ET WANG, 1994 (NEMATODA: CAPILLARIIDAE)
No full textRe-examination of the syntypes of the capillariid nematode Neocapillaria phoxini Yu et Wang, 1994, the type species of Neocapillaria Yu et Wang, 1994, described from the intestine of the freshwater fish Phoxinus lagowskii variegatus Gunther (Cyprinidae) from China, confirmed its morphological similarity with species of Freitascapillaria Moravec, 1987, to which it is transferred as Freitascapillaria phoxini (Yu et Wang, 1994) comb. n. Consequently, Neocapillaria Yu et Wang, 1994 (a homonym to Neocapillaria Moravec, 1987) and Sinocapillaria Moravec et Spratt, 1998 become junior synonyms of Freitascapillaria. Skrjabinocapillaria gigantea is transferred to Freitascapillaria as F. gigantea (Wang, 1984) comb. n.Re-examination of the syntypes of the capillariid nematode Neocapillaria phoxini Yu et Wang, 1994, the type species of Neocapillaria Yu et Wang, 1994, described from the intestine of the freshwater fish Phoxinus lagowskii variegatus Gunther (Cyprinidae) from China, confirmed its morphological similarity with species of Freitascapillaria Moravec, 1987, to which it is transferred as Freitascapillaria phoxini (Yu et Wang, 1994) comb. n. Consequently, Neocapillaria Yu et Wang, 1994 (a homonym to Neocapillaria Moravec, 1987) and Sinocapillaria Moravec et Spratt, 1998 become junior synonyms of Freitascapillaria. Skrjabinocapillaria gigantea is transferred to Freitascapillaria as F. gigantea (Wang, 1984) comb. n
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
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
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