The paper studies various functions of Berzelian formulas in European organic chemistry prior to the mid-nineteenth century from a semiotic, historical and epistemological perspective. I argue that chemists applied Berzelian formulas as productive ‘paper tools’ for creating a chemical order in the ‘jungle’ of organic chemistry. Beginning in the late 1820s, chemists applied chemical formulas to build models of the binary constitution of organic compounds in analogy to inorganic compounds. Based on these formula models, they constructed new classifications of organic (...) substances. They further applied Berzelian formulas in a twofold way to experimentally investigate organic chemical reactions: as tools which supplemented laboratory tools and as tools for constructing interpretive models of organic reactions. The scrutiny of chemists' performances with chemical formulas on paper also reveals a dialectic which contributed considerably to the formation of the new experimental culture of synthetic carbon chemistry that emerged between the late 1820s and the early 1840s. In an unintended and unforeseen way, the tools reacted back on the goals of their users and contributed to conceptual development and a shift of scientific objects and practices which transcended the originally intended chemical order. (shrink)

Over the past decades, self-assembly has attracted a lot of research attention and transformed the relations between chemistry, materials science and biology. The paper explores the impact of the current interest in self-assembly techniques on the traditional debate over the nature of life. The first section describes three different research programs of self-assembly in nanotechnology in order to characterize their metaphysical implications: (1) Hybridization (using the building blocks of living systems for making devices and machines) ; (2) Biomimetics (making artifacts (...) mimicking nature); (3) Integration (a composite of the two previous strategies). The second section focused on the elusive boundary between self-assembly and self-organization tries to map out the various positions adopted by the promoters of self-assembly on the issue of vitalism. (shrink)

In 1858, August Kekulé and Archibald Scott Couper independently published similar ideas regarding the tetravalence and self-linking ability of carbon atoms; three years later, the Russian chemist Aleksandr Mikhailovich Butlerov read a paper at the German Naturforscherversammlung in Speyer, which restated, clarified, and enlarged upon the ideas of Kekulé and Couper. In 1958, the centenary of the structure theory was celebrated in Chicago, London, Heidelberg, and Ghent; the celebrations in Moscow, Frunze, and Kazan took place three years later. For over (...) a century chemists and chemical historians have disputed the origins of structure theory. Sometimes this activity has been confined to occasional sniping, but at other times determined battles have been fought. The polemic has never been characterized by cool and dispassionate discourse. Western historians have in general been unwilling or unable to master the extensive Russian literature on the question; the arguments of Soviet historians have often been clothed in Marxist rhetoric or otherwise influenced by political considerations. (shrink)