Wilhelm Pfeffer
Wilhelm Friedrich Philipp Pfeffer (9 March 1845 – 31 January 1920) was a German
Academic career
He studied
In 1873 he was appointed professor of
He was elected a member of the Royal Swedish Academy of Sciences and an International Honorary Member of the American Academy of Arts and Sciences in 1897, an International Member of the United States National Academy of Sciences in 1903, and the American Philosophical Society in 1909.[2][3][4]
Scientific work
Pfeffer was a pioneer of modern
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.[6]
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The Pfeffer cell determines the osmotic pressure of a solution.
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The Pfeffer cell was composed of a porousmanometer.[7]
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Osmotic pressure of dissolved sucrose (german: "Rohrzucker") obtained by Pfeffer (Table 9 from "Osmotische Untersuchungen", 1877)
Written works
- Physiologische Untersuchungen - 1873 (Physiological studies)
- Lehrbuch der Pflanzenphysiologie (Textbook of plant physiology).
- Die periodischen Bewegungen der Blattorgane - 1875 (The periodic movements of "leaf organs")
- Osmotische Untersuchungen – Studien zur Zellmechanik - 1877 (Osmotic studies)
- Beiträge zur Kenntniss der Oxydationsvorgänge in lebenden Zellen - 1889 (Contributions to the knowledge of the oxidativeprocesses in living cells).
- Über Aufnahme und Ausgabe ungelöster Körper - 1890
- Studien zur Energetik der Pflanze - 1892 (Studies on the energetics of plants)
- Druck- und Arbeitsleistung durch wachsende Pflanzen - 1893
- Untersuchungen über die Entstehung der Schlafbewegungen der Blattorgane - 1907
- Der Einfluss von mechanischer Hemmung und von Belastung auf die Schlafbewegung - 1911 (The influence of mechanical stress on the inhibition of sleep and movement).
- Beiträge zur Kenntniss der Entstehung der Schlafbewegungen- 1915 (Contributions to the knowledge on the genesis of sleep movements).
References
- List of publications copied from an equivalent article at the German Wikipedia.
- ISBN 3-428-00201-6, S. 309 f.
- ^ "Wilhelm Friedrich Philipp Pfeffer". American Academy of Arts & Sciences. 2023-02-09. Retrieved 2023-12-14.
- ^ "Wilhelm Pfeffer". www.nasonline.org. Retrieved 2023-12-14.
- ^ "APS Member History". search.amphilsoc.org. Retrieved 2023-12-14.
- ^ Botany online: Membranes and Transport – Osmosis Archived 2008-02-22 at the Wayback Machine at www.biologie.uni-hamburg.de
- ^ Who's Who of Victorian Cinema at www.victorian-cinema.net
- ISBN 0-217-72872-3.
- ^ International Plant Names Index. Pfeff.