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  • 1 University of Debrecen Department of Hydrobiology H-4010 Debrecen Egyetem tér 1 Hungary
  • | 2 Hungarian Academy of Sciences Hungarian Danube Research Station of Institute of Ecology and Botany H-2131 Göd Jávorka S. u. 14 Hungary
  • | 3 University of Debrecen Department of Ecology H-4010 Debrecen Egyetem tér 1 Hungary
  • | 4 Faculty of Science University of Zagreb Department of Biology Rooseveltov trg 6 10 000 Zagreb Croatia
  • | 5 Environmental Protection Inspectorate for Trans-Tiszanian Region H-4025 Debrecen Piac utca 9/b Hungary
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Phosphatase enzymes are capable of releasing phosphate through cleavage of phosphoester bonds. The seasonal importance of this process was examined by using a model substrate paranitrophenylphosphate and the Michaelis-Menten equation to estimate the release rate of PO 4 -P from phosphomonoesters. The seasonal occurrence of phosphomonoesters and acid phosphatase activity was used to estimate the velocity of phosphate release from these compounds. Filter fractionation of phosphatase activity demonstrated that most activity (>60%) was in size fractions less than 0.45 μm. The release rates were highest in May and June (15 to 25 nmol L −1 min −1 ) during the Gonyostomum semen (Raphidophyta) bloom and decreased to less than 2 nmol L −1 min −1 in two weeks and remained low throughout the summer and the fall. Fractionation of 32 P-H 3 PO 4 labelled dissolved organic phosphorus showed this fraction to vary considerably through the year. Potential phosphate release declined through the summer and into the fall. Significance of the co-occurrence of phosphomonoesters and acid phosphatase activity maxima and Gonyostomum semen (Raphidophyta) bloom is discussed.

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Editorial Board

      Csányi, Vilmos (Göd)
      Dudits, Dénes (Szeged)
      Falus, András (Budapest)
      Fischer, Ernő (Pécs)
      Gábriel, Róbert (Pécs)
      Gulya, Károly (Szeged)
      Gulyás, Balázs (Stockholm)
      Hajós, Ferenc (Budapest)
      Hámori, József (Budapest)
      Heszky, László (Gödöllő)
      Hideg, Éva (Szeged)
      E. Ito (Sanuki)
      Janda, Tibor (Martonvásár)
      Kavanaugh, Michael P. (Missoula)
      Kása, Péter (Szeged)
      Klein, Éva (Stockholm)
      Kovács, János (Budapest)
      Brigitte Mauch-Mani (Neuchâtel)
      Nässel, Dick R. (Stockholm)
      Nemcsók, János (Szeged)
      Péczely, Péter (Gödöllő)
      Roberts, D. F. (Newcastle-upon-Tyne)
      Sakharov, Dimitri A. (Moscow)
      Singh, Meharvan (Fort Worth)
      Sipiczky, Mátyás (Debrecen)
      Szeberényi, József (Pécs)
      Székely, György (Debrecen)
      Tari, Irma (Szeged)
      Vágvölgyi, Csaba (Szeged),
      L. Zaborszky (Newark)

 

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Acta Biologica Hungarica
Language English
Size  
Year of
Foundation
1950
Publication
Programme
changed title
Volumes
per Year
 
Issues
per Year
 
Founder Magyar Tudományos Akadémia
Founder's
Address
H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5383 (Print)
ISSN 1588-256X (Online)