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1993 (1)
1980 (1)
1Author    Renate Meier, W. Erner Reisser, Wolfgang Wiessner, Marcelle Lefort-TranRequires cookie*
 Title      
 Abstract    Measurements of particle densities on the two freeze-fracture faces of digestive and perialgal vacuole mem­ branes in green and aposym biotic Paramecium bursaria Ehrbg. show distinct differences between the P-faces of both m em brane types. The distribution of particle den­ sities is more homogenous on the P-faces of perialgal vacuole membranes than on the P-faces o f digestive vacuole membranes. Possibly homogeneity among peri­ algal vacuole membranes reflects the stability o f perialgal vacuoles during their life cycle. Perhaps lysosomes cannot fuse with them. 
  Reference    Z. Naturforsch. 35c, 1107—1110 (1980); received October 28 1980 
  Published    1980 
  Keywords    Paramecium bursaria, Chlorella sp, Symbiosis, Membranes, Freeze-Fracture 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-1107_n.pdf 
 Identifier    ZNC-1980-35c-1107_n 
 Volume    35 
2Author    Claus Bornemann, Hartmut FollmannRequires cookie*
 Title      
 Abstract    Infection o f Chlorella-like green algae with freshwater phycoviruses is associated with a large and rapid de­ mand for D N A precursors which cannot be met by the algal deoxyribonucleotide-synthesizing enzymes. We have demonstrated in these cells an up to ten-fold in­ crease o f the key enzyme, ribonucleotide reductase, 1 —2 h post infection. The enzyme activity has been par­ tially enriched from cell extracts. In vitro, it differs from that o f uninfected algae in three characteristic parame­ ters, viz. eight-fold higher resistance to millimolar hy­ droxyurea concentrations, much higher optimum con­ centration o f an allosteric effector nucleotide, thymidine triphosphate, and an unusually low temperature opti­ mum at 20 °C. We conclude that the large D N A phyco­ viruses, like Herpes and pox viruses, code for their own specific ribonucleotide reductase. 
  Reference    Z. Naturforsch. 48c, 113 (1993); received September 18 1992 
  Published    1993 
  Keywords    Chlorella sp, Deoxyribonucleotides, Phycodnaviridae, Ribonucleotide Reductase, Virus Infection 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0113_n.pdf 
 Identifier    ZNC-1993-48c-0113_n 
 Volume    48