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Karl Arens

Karl Arens, German-born Brazilian plant physiologist and ecologist (Munsterschwarzach, Bayern 01 January 1902 – São Carlos, São Paulo State 1981)
 
 
 
ACHIEVEMENTS

Observed that substances loss through cuticle was a generalized phenomenon in plants

Die kutikuläre exkretion der laubblatter. Jahrb. Wiss. Bot. 80:284-300, 1934
 

Developed a new method for direct determination of osmotic pressure in a plant cell with a gauge

Um novo methodo de determinação directa de pressão osmótica numa cellula vegetal com manômetro (1938)
 

Proposed the hypothesis of active membrane (1948)

The “active membrane”: an hypothesis to explain the transfer of water and solutes in plants, as depending upon respiration. Rev. Canad. Biol. 8:157-72, 1949
 

Developed Arens technique or callose test

Prova de calose por meio da microscopia a luz fluorescente com applicações do método. Lilloa 18:71-75, 1949
 

Proposed oligotrophic scleromorphism in Cerrado plants (1958)


Ein polaritaets und steurungsmechanismus der Zelle. Protoplasma (1960)