Mutable things: colours as material practice in the northwest of South Australia

This article details the material colour practices of An angu (Pitjantjatjara and Yankunytjatjara people) living in the east of the Western Desert, to show how coloured things have been instrumental in remaking their lives post contact with the colonizers. I argue here that ‘colour’ is a cultural invention. Brightly coloured things, such as cloth and paints, were eagerly appropriated by Aboriginal people when these were imported during the colonization of Australia. Material colours, including consumer goods, have become integral to An angu's conception of their own humanity in the contemporary world. For An angu, colours manifest the mutability of things and sequences of colour transformations are states of becoming.

Résumé

L'auteure détaille les pratiques matérielles des couleurs des An angu (peuples Pitjantjatjara et Yankunytjatjara) vivant dans l'est du Désert de l'Ouest pour montrer comment les choses colorées ont joué un rôle crucial pour reconstruire leurs existences après le contact colonial. Elle avance que « la couleur » est une invention culturelle. Les Aborigènes se sont appropriés avec enthousiasme les objets de couleur vive, tissus et peintures par exemple, lorsque ceux‐ci ont été importés pendant la colonisation de l'Australie. Les couleurs matérielles, notamment celles de biens de consommation courante, en sont venues à faire partie intégrante de la conception par les An angu de leur propre humanité dans le monde contemporain. Pour eux, les couleurs manifestent la mutabilité des choses et les séquences de transformations des couleurs sont des états de devenir.     

The ontogeny and homology of the Weberian apparatus in the zebrafish Danio rerio (Ostariophysi: Cypriniformes)

The ontogeny of the Weberian apparatus was examined in the zebrafish, Danio rerio , using both cleared and stained specimens and histology. Over 300 individuals from four independent zebrafish lineages, ranging in size from 3 to 28 mm TL, were examined for this study. Results provide a basic understanding of the development of the Weberian apparatus in the wild-type zebrafish. Our results, in conjunction with those already published, point to substantial variation in the development of the Weberian apparatus among otophysans and new interpretations of the homology of certain ossicles (e.g. tripus and claustrum). Hypotheses of homology among various Weberian ossicles are considered and represent an important step in understanding the evolution of sound transmission in ostariophysan fishes.  © 2004 The Linnean Society of London, Zoological Journal of the Linnean Society , 2004, 140 , 241–254.     

Multiple determinants influence root colonization and induction of induced systemic resistance by Pseudomonas chlororaphis O6

Colonization of the roots of tobacco by Pseudomonas chlororaphis O6 induces systemic resistance to the soft-rot pathogen, Erwinia carotovora ssp. carotovara SCC1. A screen of the transposon mutants of P. chlororaphis O6 showed mutants with about a fivefold reduction in ability to induce systemic resistance to the soft-rot disease. These mutations disrupted genes involved in diverse functions: a methyl-accepting chemotaxis protein, biosynthesis of purines, phospholipase C, transport of branched-chain amino acids and an ABC transporter. Additional mutations were detected in the intergenic spacer regions between genes encoding a GGDEF protein and fumarate dehydratase, and in genes of unknown function. The mutants in the ABC transporters did not display reduced root colonization. However, the other mutants had up to 100-fold reduced colonization levels. Generally the production of metabolites important for interactions in the rhizosphere, phenazines and siderophores, was not altered by the mutations. A reduced induction of systemic resistance by a purine biosynthesis mutant with a disrupted purM gene correlated with poor growth rate, lesser production of phenazines and siderophore and low levels of root colonization. These studies showed that multiple determinants are involved in the induction of systemic resistance, with there being a requirement for strong root colonization.