1,720,957 research outputs found
Lysiosquilloides Mapia, A New Species Of Stomatopod Crustacean From Northern Sulawesi (Stomatopoda: Lysiosquillidae)
No full textErdmann, Mark V., Boyer, Massimo (2003): Lysiosquilloides Mapia, A New Species Of Stomatopod Crustacean From Northern Sulawesi (Stomatopoda: Lysiosquillidae). Raffles Bulletin of Zoology 51 (1): 43-47, DOI: http://doi.org/10.5281/zenodo.461874
Lysiosquilloides Manning 1977
No full textKey to species of Lysiosquilloides 1. Rostral plate triangular, A2 scale slender, length greater than 2.9 times width………….................... L. aulacorhynchus – Rostral plate cordiform, A2 scale broad, length 2.4-2.7 times width…………..............................................………………...2 2. Mesial lobe of cornea subglobular, TS8 sternal keel rounded …………....................................................… L. siamensis – Mesial lobe of cornea distinctly conical, TS8 sternal keel angular………….........................................……. L. mapiaPublished as part of Erdmann, Mark V. & Boyer, Massimo, 2003, Lysiosquilloides Mapia, A New Species Of Stomatopod Crustacean From Northern Sulawesi (Stomatopoda: Lysiosquillidae), pp. 43-47 in Raffles Bulletin of Zoology 51 (1) on page 47, DOI: 10.5281/zenodo.461874
Phylogenetic relationships within the Ovulidae (Gastropoda: Cypraeoidea) based on 16S rRNA sequences
No full textClosely interacting groups, such as hosts and parasites, sometimes provide useful models to study evolution and adaptive processes. In Ovulidae, a widespread family of specialised browsing carnivorous molluscs that feed on polyps and tissues of Anthozoa, close association with the host has produced a plethora of adaptations affecting shell morphology, colour pattern and mantle shape. These morphological characters have been widely used in ovulid taxonomy, although putative differences are often based on trivial and inconsistent variations. In this work we used a molecular approach to generate the basal phylogeny of the family. Phylogenetic analyses of mitochondrial 16S rRNA gene sequences of 32 species from 23 genera reveal unexpected taxonomic groupings from the genus up to the family level, as well as unexpected phenomena of homoplasy in conchological features. Since molecular phylogenies also provide an evolutionary framework where character transformations are polarised, we used this basal ovulid phylogeny to explore the specificity of the association and the degree of morphological adaptation to the hos
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
sp. (Anthozoa, Antipatharia)
No full textMale polyps of the antipatharian Cirrhipathes sp., collected along the coral reef of
Siladen Island (Sulawesi, Indonesia), were studied in order to gain an insight into the reproductive
biology. Spermatocysts (maximum size 120 mm) are located within the primary gametogenic
mesenteries and are separated by mesenteric cell cytoplasmic extensions. Sperm,
maturing along radial rows, have a fairly round shape and contain a series of electron-dense
vesicles in the apical nuclear region. A single mitochondrion flanks the nucleus. A peculiar
cup-like electron-dense body, edged with regularly spaced electron-dense granules, is interposed
between the nucleus and the tail, and delimits a central region that includes two centrioles.
Cross-sections of the cup-like body reveal that the distal centriole has a pericentriolar
system, consisting of nine arms arranged in a radial pattern. Each arm branches into three
processes that are connected to the electron-dense granules. Indirect evidence of spawning is
derived fromthe accumulation of sperm in the gastric cavity. This process takes place through
the lysis of the cells bordering the mesenteries. Intact cells of this bordering layer appear to be
involved in the phagocytosis of non-expelled gametes
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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