Search results for "SCARA"
showing 10 items of 26 documents
Evidence for male XO sex-chromosome system in Pentodon bidens punctatum (Coleoptera Scarabaeoidea: Scarabaeidae) with X-linked 18S-28S rDNA clusters
2004
In scarab beetle species of the genus Pentodon, the lack of analysis of sex chromosomes in females along with the poor characterization of sex chromosomes in the males, prevented all previous investigations from conclusively stating sex determination system. In this study, somatic chromosomes from females and spermatogonial chromosomes from males of Pentodon bidens punctatum (Coleoptera: Scarabaeoidea: Scarabaeidae) from Sicily have been analyzed using non-differential Giemsa staining. Two modal numbers of chromosomes were obtained: 2n = 20 and 19 in females and males, respectively. This finding along with other karyological characteristics such as the occurrence of one unpaired, heterotypi…
Heterochromatin of the scarab beetle, Bubas bison (Coleoptera: Scarabaeidae) II. Evidence for AT-rich compartmentalization and a high amount of rDNA …
2005
An unexpected result arising from a previous characterization of the scarab beetle Bubas bison (Coleoptera: Scarabaeidae) heterochromatin was its unusual homogeneous reaction to different staining methods. In particular, silver stainability of heterochromatic ends of all chromosomes prevented identification of the number of rDNA transcriptionally active regions. Data formerly obtained using silver impregnation (Ag-NOR), C- G- and DAPI banding are here improved and completed by application of CMA(3) staining and rDNA FISH with the aim to investigate heterochromatin base composition and locate rDNA regions with respect to NOR-associated heterochromatin. Our results show that B. bison has a hi…
Chromosome Analysis and rDNA FISH in The Stag Beetle Dorcus Parallelipipedus L. (Coleoptera: Scarabaeoidea: Lucanidae)
2001
In the present work the chromosome complement (2n = 18; 8AA + XY) of the stag beetle Dorcus parallelipipedus L. (Scarabaeoidea: Lucanidae) is analyzed using conventional Giemsa staining, banding techniques and ribosomal fluorescent in situ hybridization (rDNA FISH). rDNA FISH remains the unique tool for providing a clear-cut identification of Nucleolar Organizer Regions (NORs) when conventional banding methods such as silver- and CMA3-staining proved to be inadequate. The dull, homogeneous CMA3 fluorescence of all chromosomes indicates the absence of markedly GC rich compartmentalized regions in D. parallelipipedus genome. Silver impregnation inadequacy in detecting NOR regions is to be sou…
Matters of scale: positive allometry and the evolution of male dimorphisms
2005
J.L.T. was funded by a Biotechnology and Biological Sciences Research Council research fellowship, J.S.K. by the Academy of Finland, and N.R.L. by a Natural Environment Research Council research fellowship. The developmental independence of alternative phenotypes is key to evolutionary theories of phenotypic plasticity and the origins of diversity. Male dimorphisms associated with alternative reproductive tactics are widely cited examples of such facultative expression of divergent fitness optima. Current models for the evolution of male dimorphisms invoke a size-dependent threshold at which the phenotype is reprogrammed. We use predictions derived from allometric modeling to test for the e…
"KARYOTYPE, BANDING AND rDNA FISH IN THE SCARAB BEETLE ANOPLOTRUPES STERCOROSUS (COLEOPTERA SCARABAEOIDEA: GEOTRUPIDAE). DESCRIPTION AND COMPARATIVE …
2004
Six specimens of Anoplotrupes stercorosus (Coleoptera Scarabaeoidea: Geotrupidae) were analysed using conventional staining, banding techniques and fluorescent in situ hybridization with a ribosomal probe (rDNA FISH). Detailed karyotype description was also joined to a comparative analysis between present data and those previously reported for Thorectes intermedius [Chromosome Res. 7 (1999) 1]. The two species, both belonging to the tribe Geotrupini, show the same modal number but different autosomal morphology which is in contrast with the high chromosome stability argued for Geotrupinae during the last three decades. Moreover, a detailed comparison reveals the occurrence of a plesiomorphi…
Mascheramenti festivi in Sicilia
2022
I mascheramenti cerimoniali, che vanno dal semplice occultamento del viso al rivestimento del corpo con specifici indumenti e attributi, ricorrono più diffusamente, in Sicilia come altrove, nel periodo carnevalesco. A cortei e performances di mascherati si accompagnano comportamenti tesi a segnalare la temporanea sospensione o il rivolgimento delle norme sociali e culturali: i giuochi licenziosi, le danze pubbliche e i balli domestici, le questue e lo smodato consumo di peculiari cibi e di bevande, la produzione di rumori e di schiamazzi, le tenzoni, il dileggio delle autorità, i motteggi e gli scherzi d’ogni sorta. Tra le performances carnascialesche che meritano di essere ricordate: la pa…
Máscaras de Sicilia. Fotografías de Attilio Russo y Giuseppe Muccio
2022
I mascheramenti, al pari degli altri simboli rituali caratterizzanti le celebrazioni carnascialesche siciliane, paiono tutti riconducibili alla sintassi propria delle feste di chiusura e apertura di un ciclo ossia di rifondazione ciclica del tempo, e finiscono con il proporre l’istituto carnevalesco, nel suo complesso, come “modello esemplare” delle cerimonie di Capodanno. Una festa cioè che attraverso parole, immagini, gesti riesce a restituire la realtà attraverso la ricostituzione per simulazione del cerchio del tempo, cioè a garantire che il tempo continui ad esserci, simulandone e ripetendone la morte e la rinascita. Las mascaradas, al igual que los demás símbolos rituales que caracter…
The genus Bolbelasmus in the western and southern regions of the Mediterranean Basin (Coleoptera: Geotrupidae: Bolboceratinae)
2016
The Bolbelasmus Boucomont, 1911 species of the western and southern regions of the Mediterranean Basin (Northern Africa, Iberian Peninsula and France) are revised. The following three new species are described: Bolbelasmus brancoi Hillert & Král sp. nov. and Bolbelasmus howdeni Hillert & Král sp. nov., both from Spain and Gibraltar, and Bolbelasmus nikolajevi Hillert, Arnone, Král & Massa sp. nov. from Egypt, Libya and Tunisia. Bolbelasmus vaulogeri (Abeille de Perrin, 1898) stat. restit. is removed from synonymy with B. bocchus (Erichson, 1841) and reinstated as a separate species. Bolbelasmus romanorum Arnone & Massa, 2010 is considered a junior subjective synonym of B. vaulogeri. Lectoty…
Development of imaging techniques in gamma-ray astronomy using coded mask systems : application to the telescope LEGRI = Desarrollo de técnicas de ob…
1996
En el rango de energías de la radiación gamma no es posible usar lentes o espejos para formar imágenes; por tanto es necesario usar otros sistemas. Una solución al problema son los telescopios de mascara codificada que consisten en un plano detector y un patrón de elementos transparentes y opacos antepuesto a el. Lo que detectamos es la sombra que producen las diferentes fuentes gamma del patrón de la mascara en el plano detector. A partir de ello, y conocido el patrón que produce las sombras (la mascara), reconstruimos el campo de fuentes. En este trabajo, y aplicado al telescopio LEGRI, se han estudiado cuatro algoritmos de reconstrucción de las fuentes (correlación balanceada de muestreo…
Pachydema lopadusanorum n.sp. (Coleoptera Melolonthidae) from Lampedusa Island (Sicily Channel, Central Metditerranean Sea, Italy)
2018
In this paper the populations of Pachydema Castelnau, 1832 (Coleoptera Melolonthidae) living in Lampedusa Island (Sicily Channel, Central Mediterranean Sea, Italy), so far attributed to P. hirticollis (Fabricius, 1787) of North Africa, are examined. The comparison of the main morphological characters between these two populations allowed to attribute those of Lampedusa to a new species that is described in the present work. Faunistic and biological observations on these species are provided.