Diagrams can serve as representational models in scientific research, yet important questions remain about how they do so. I address some of these questions with a historical case study, in which diagrams were modified extensively in order to elaborate an early hypothesis of protein synthesis. The diagrams’ modelling role relied mainly on two features: diagrams were modified according to syntactic rules, which temporarily replaced physico-chemical reasoning, and diagram-to-target inferences were based on semantic interpretations. I then explore the lessons for the (...) relative roles of syntax, semantics, external marks, and mental images, for justifying diagram-to-target inferences, and for the “artefactual approach” to scientific models. (shrink)

Dans cet article, je soutiens que les métaphores « missile » et « ciblage » dans la recherche sur les médicaments à base de nanoparticules jouent différents rôles. Je soutiens que le « missile » joue un rôle scientifique marginal et un rôle plus central dans la communication, tandis que le « ciblage» est devenu une métaphore organisatrice dans le domaine de la recherche. La raison, je le suggère, est que le ciblage est l’explanandum principal du domaine et que cette (...) métaphore continue d’être pertinente même lorsque la nanomédecine mûrit pour s’attaquer à des problèmes plus complexes. Enfin, je discute des suggestions récentes de nouvelles métaphores axées sur la complexité, et je suggère que le rôle significatif des modèles simplificateurs et le besoin réel de tels modèles peuvent expliquer pourquoi les métaphores de complexité n’ont pas retenu l’attention des chercheurs. (shrink)

Philosophical analyses of scientific concepts are legion. However, this literature is replete with methodological errors that have largely gone unnoticed. Five distinct projects are conflated which has led to faulty inferences, ambiguities, and mischaracterizations. There has also been some recent enthusiasm for approaches that attempt to rectify problematic scientific concepts but the motivations for these approaches are questionable. I am hopeful that by bringing these various issues to light that it will lead practitioners to be more explicit about their aims (...) and subsequently result in better analyses. (shrink)