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simulium cauchense floch & abonnenc and simulium quadrifidum lutz are widely distributed in the amazon region and are morphologically similar at the larval and pupal stages. chromosomally, these species are readily distinguished by the position of the nucleolar organizer, which is in the short arm of chromosome i in s. cauchense and in the long arm of chromosomes iii in s. quadrifidum. they also differ by three fixed inversions. sex chromosomes are undifferentiated in both species. chromosomal resolution of the two species allowed us to evaluate four structural features previously used as diagnostic aids at the larval stage. characters that distinguish larvae of the two species are the number of branches and branching patterns of the dorsal abdominal setae and the dark band on each primary fan. branching patterns of the gill histoblasts were often diagnostic, with s. quadrifidum exhibiting more proximal branching and s. cauchense more distal branching. sites where both species occurred sometimes had larvae with one petiole branching proximally and the other distally; in these cases examination of the chromosomes permitted assignment of the specimen to species. pigmentation patterns of larvae, on the other hand, are highly variable. color typically is sex linked in both species. key words: simulium (psaroniocompsa) - polytene chromosomes - cytotaxonomy - brazilian amazon ________________________________________ cytotaxonomic studies of black flies have repeatedly demonstrated the value of chromosomal characters in elucidating phylogenetic relationships, revealing sibling species and providing diagnostic aids for species identification (rothfels 1988, adler et al. 2004). in brazil, numerous black flies have been investigated cytotaxonomically (e.g., campos et al. 1996, 2001, charalambous et al. 1996, hamada & adler 1999, luz 1999, ríos-velásquez et al. 2002, pereira 2004). while chromosomal studies are often essential in revealing sibling species and resolving relationships, the strongest taxonomic and phylogenetic resolution of black flies comes from a combined chromosomal-morphological approach. this approach has permitted an analysis of species diversity in the amazon basin (hamada et al. 2002) that is more critical than has been possible using the conventional morphotaxonomic approach alone. various subgeneric classifications have been used for neotropical black flies. crosskey and howard (1997) and crosskey (2002), for example, recognize the neotropical subgenus psaroniocompsa, with 38 species and 5 species groups. py-daniel (1983) and coscarón (1987) consider the s. amazonicum and s. quadrifidum species groups of crosskey and howard (1997) to represent their subgenera cerqueirellum and coscaroniellum, respectively. py-daniel and sampaio (1995) ranked these two subgenera as genera. cytogenetic techniques can provide independent assessments of these phylogenetic hypotheses and yield insight into classification issues. the objective of the present study is to resolve the chromosomal differences between simulium cauchense floch & abonnenc and simulium quadrifidum lutz, two members of the subgenus psaroniocompsa (crosskey & howard 1997), and to evaluate the usefulness of morphological discriminators previously used for the larvae. s. cauchense is known from brazil, french guiana, guyana, and venezuela, whereas s. quadrifidum, with a slightly broader distribution, is known from bolivia, brazil, colombia, ecuador, french guiana, guyana, suriname, and venezuela. materials and methods larvae were collected from 15 streams in the states of amapá, amazonas, rondônia, and roraima (fig. 1). s. quadrifidum was collected at 13 sites and s. cauchense at 6; the latter species was not collected in the state of rondônia. most collections were made in 2000 and 2001, although two collections were made in 1997 and one each was made in 1996, 1999, 2002, and 2003 (table i).

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keep your baby

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curriculum vitae nom ; bousbaa hocine date de naissance : 1955 sit.familiale : marié adresse : bousbaa hocine cite boubekri tamlouka w- guelma algérie e-mail :salhoci@yahoo.fr. mobile : 0797390741 diplômes : - formation professionnelle de 3 ans en mécanique générale en algérie - formation d’une année avec jgc sur le traitement et mise en service des installations - l’un des premiers qui ont démarre les installations gazières qui produisent chacune 60 millions de mètre cube de gaz 800 cent tonne par jour condensat et 4o0cent tonne gpl chez sonatrach - formation avec sonatrach de a florence on 2003 (nuovo pignone) sur les booster de gaz -formation sur l’exploitation du système de contrôle distribué par dcs vie professionnelle : 35 années (1978/2013) d’activité dans les modules de traitement de gaz de hassi-r’mel dans le service exploitation des unités gazières, de suivis des machines tournantes de l’élaboration des programmes de suivis des inspections triennales. commissionning avec jgc et préparation circuit et contre toutes les vannes automatiques avant démarrage de l usine on 1980 commisisonning lors du balancement du tableau conventionnel vers dcs sans arrêter la production commissionning sonatrach avec abb contrôle circuit de toutes les vannes ouverture et fermeture en tant que contremaitre principal avant la mise on service de trois turbocompresseurs installes on amont de l usine pour augmenter la pression a 140 bars suite a la baisse de pression du gisement a hassi r mel -machines tournantes : turbo –expander turbo –générateur, turbocompresseur assistes par mark v unites :  module de traitement du gaz naturel et séparation condensat et gpl  traitement et production des eaux de service, eaux potable et refroidissement  injection et régénération de glycol meg »  centrale de stockage et du transfert des produits traites (condensat et gpl)  production et stockage, holding et transfert des gpl  utilités communes : air instrument –service et gaz inerte (azote) postes occupes :  contremaitre exploitation 01/01/2000  contremaitre principal niveau 1 1/01/2000 1/1/2011  contremaitre principal niveau2 1/12011 au 1/1 2013 bousbaa salutation

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anglais, espagnol, français, arabe, garafuna.
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lettre d’invitation [pdf] anglais, français, arabe
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