Miekan vai saarnan voimalla? : kristinuskon tulosta Suomeen ja Itämeren alueelle

Zusammenfassung: Schwert- oder Wortmission? : Wege und Methoden der Christianisierung in Finnland und im Ostseeraum

Sen wielä wirhellisen ilo-weisu kosca hän Jumalan siunauxen woimalla ja Läkärin konstin awulla parattin huulensa wirhestä

Turku : Thomas Ragwaldinpoika 1763

Hyödyllinen huwitus luomisen töistä Yxinkertaisille awuxi Jumalan hywyden tundoon ja palweluxeen

Turku : Omalla kustannuxella 1791, Frenckell

De Svante Arrhenius ao peagâmetro digital: 100 anos de medida de acidez

This work describes the establishment of the concept of pH and the evolution of its measurement. The origin of the pH definition can be found in the development of the chemistry of aqueous solutions during the XIXth century. The electrolytic dissociation theory by Svante Arrhenius played a central role. After the proposal of the pH scale by Sörensen, many years were necessary for the acceptance of this new parameter among chemists in general. Its importance was first recognized in biochemistry and related areas. Twenty years after, its importance had been recognized in many industrial and laboratorial practices. The previous methods were based on colorimetric and electrometric methods, but both suffered from many problems. Acceptance of pH in Chemistry was only possible after the development of experimental trustable measurements. The invention of the pH meter was the primordial step.

Jumalan kasvojen kuvastimet : katolisen mystiikan synty ja kehitys uskonpuhdistuksen vuosisadalle

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