1,721,407 research outputs found
Short notes No. 7/2003 – Behaviour. Metopodia pilicornis (Pandellé, 1895) kleptoparasitic on Sphex funerarius Gussakovskij, 1934 (Diptera: Sarcophagidae, Miltogramminae; Hymenoptera: Sphecidae)
No full textTwo new species of European Stevenia (Diptera: Rhinophoridae), with a key to the Palaearctic species
No full textCharacterization of PSII-LHCII supercomplexes isolated from pea thylakoid membranes by one-step treatment with α- and β- dodecyl-D-maltoside
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Hypoderma sinense: solving a century-old enigma
No full textAmong the species of Hypoderma (Diptera: Oestridae) that have been described and named over the last three centuries, Hypoderma sinense Pleske has been the subject of several scientific discussions. Hypoderma sinense was described by T. Pleske in 1926 on the basis of only three females collected by the Russian explorer P. K. Kozlov nearly 25 years earlier during a scientific expedition to China (1900-1901). This species was examined by the foremost oestrid authorities and synonomized with H. lineatum. Recently a unique, unidentified species of Hypoderma was observed to infect cattle and yaks in China. Molecular and morphological observations confirmed the unique nature of the third-stage larvae. This data initiated a debate within the scientific community regarding the proper name of this species, in particular with reference to previous taxonomical discussion on the validity of H. sinense. The present work provides a historical overview of the Russian scientific expeditions that collected the specimens and of the explorers and the entomologists who contributed to the description of H. sinense. The morphological examination of the original type material of H. sinense and the comparison with females of H. lineatum indicated that the H. sinense lectotype, deposited at the Zoological Institute of the Russian Academy of Sciences, St Petersburg, was within the range of variation of H. lineatum. Comparisons of the cox1 (688 bp) sequence obtained from the leg of a paralectotype of H. sinense with those of H. bovis (Linneaus), H. lineatum (De Villers) and of a sixth valid species of Hypoderma identified as "H. sinense" available in GenBank revealed differences of 9.7%, 7.2% and 0.3%, respectively. On the basis of these results, we concluded that the nominal species H. sinense should be treated as valid
Phylogeny of Rhinophoridae and Polleniidae (Diptera): toward the evolution of Oestroidea
No full textCalyptrates are a megadiverse, actively radiating, group of dipterans, which are widely spread and abundant in nearly all terrestrial environments. Despite huge diversity and economic importance, their phylogeny is far from resolved. Recent attempts employing few taxa seem converging in retrieving monophyly for most of the families and subfamilies, but deep relationships among these, especially for those of the oestroid clade (blow flies and relatives), are labile when not changing. The goal of the present project is to shed some light on the deep phylogenetic relationships among Calyptratae by using an anchored hybridization approach with a careful taxon sampling. Furthermore, we aim at resolving the generic phylogeny of two key families of parasitoid flies: Rhinophoridae and Polleniidae.
Rhinophorids are interesting because of their peculiar parasitoid habit: they are the only insects having exploited crustaceans (Crustacea, Isopoda, Oniscidea) as hosts. Moreover, adult rhinophorids are difficult to recognize from other oestroids due to the lack of autapomorphies. Differently, however, the preimaginal instars present sound autapomorphies. Notwithstanding the several phylogenetic investigations conducted so far, the phylogenetic position of the rhinophorids is ambiguous and there is an impelling need of improving both taxon sampling and sequence data in order to gain a better resolution.
In turn, the phylogenetic position of the polleniids as sister group of the Tachinidae is becoming consensus recently, but the phylogenetic relationships within the family are still unknown.
In conclusion we aim to reconstruct a solid phylogeny of these groups in order to build up a stable and predictive classification of the Oestroidea
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
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