(This scarce antiquarian book is a facsimile reprint of th...)
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Botanist pharmacist university professor
He studied chemistry and pharmacy at the University of Göttingen, where his instructors included Friedrich Wöhler (1800-1882), William Eduard Weber (1804-1891) and Wilhelm Rudolph Fittig (1835-1910). At Berlin, he studied under Alexander Braun (1805-1877) and was an assistant to Nathanael Pringsheim (1823-1894).
Afterwards, he furthered his education at the Universities of Marburg and Berlin. Later on, he served as an assistant to Julius von Sachs (1832-1897) at Würzburg,
In 1873 he was appointed professor of pharmacology and botany at the University of Bonn, followed by professorships at the Universities of Basel (from 1877) and Tübingen (from 1878), where he also served as director of the Botanischer Garten der Universität Tübingen. In 1887 he became a professor at the University of Leipzig and director of its botanical garden.
Pfeffer was a pioneer of modern plant physiology.
His scientific interests included the thermonastic and photonastic movements of flowers, the nyctinastic movements of leaves, protoplastic physics and photosynthesis. In 1877, while researching plant metabolism, Pfeffer developed a semi-porous membrane to study the phenomena of osmosis.
The eponymous "Pfeffer cell" is named for the osmometric device he constructed for determining the osmotic pressure of a solution. During his tenure at Leipzig, Pfeffer published an article on the use of photography to study plant growth.
He wanted to extend the chronophotographic experiments of Étienne-Jules Marey (1830-1904) by producing a short film involving the stages of plant growth.
This "movie" would be filmed over a period of weeks by frame-at-a-time exposure taken at regular spaced intervals. Later, time-lapse photography would become a commonplace procedure.
(This scarce antiquarian book is a facsimile reprint of th...)
(Lang:- German, Pages 206. Reprinted in 2013 with the help...)
Royal Society; Royal Swedish Academy of Sciences. Bavarian Academy of Sciences and Humanities]
He was elected a member of the Royal Swedish Academy of Sciences in 1897.
