|For a bigger commensurable potential range we used directly heatable bismuth electrodes. With these electrodes it was possible to measure in a more negative potential. We could detect a very small amount of organic molecules. Furthermore we could detect hybridization reactions on heated gold electrodes. We used targed strands labeled with the complex [OsO4(bipy] and detect them on immobilized probes. It was possible to label DNA and RNA-strands. The use of higher temperatures enabled the separation of complementary DNA-targets and targets containing mismatches.