The taxon Protista was originally given by Ernst Haeckel in 1866 and included all unicellular organisms either prokaryotic or eukaryotic. In the modern view, the protists are eukaryotic organisms of unicellular organization, and thus the term embraces classical protozoa, unicellular phototrophic organisms such as diatoms, and lower unicellular fungi (28). Due to the extreme diversity, the taxon...

17.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387 17.2 Materials and Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390 17.2.1 Study Site and Species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

rt 38.5 C ....................................................... ........... 392 DEGRADATION OF VIRAL RNA DOES NOT REQUIRE PROTEIN SYNTHESIS. 393 REPLICASE ACTIVITY AT OPTIMAL AND SUPRAOPTIMAL TEMPERATURES................................................................... 394 SOMETHING IS DESTROYED AT SUPRAOPTIMAL TEMPERATURES........ 394 WIHERE DOES THE RIBONUCLEASE COME FROM? ...... ...........