The present application relates to nucleic acid-binding chips for monitoring bioprocesses, especially for detecting phosphate deficiency conditions. Said chips support probes for at least three of the following 47 genes: yhcR, tatCD, ctaC, gene for a putative acetoin reductase, spoIIGa, nasE, pstA, spoIIAA, gene for a hypothetical protein, yhbD, cotE, gene for a conserved hypothetical protein, yurl, spoVID, gene for a putative aromatic-specific dioxygenase, yhbE, gene for a putative benzoate transport protein, pstBB, spoIIIAH, gene for a hypothetical protein, spoIIQ, spoIIIAG, yvmA, gene for a putative ribonuclease, dhaS, yrbE, gene for a putative decarboxylase / dehydratase, htpG, yfkH, spoIIAB, spoIIIAF, alsD, gdh, yfkN, pstC, yfmQ, pstBA, dhaS homolog, gene for a putative phosphatase, phy, cypX, alsS, phoD, pstS, phoB, yvnA, yvmC, the total number of phosphate metabolism-specific different probes on the nucleic acid-binding chips not exceeding 100. The present application further relates to the use of corresponding gene probes, in particular on such chips, and to corresponding methods and possible uses.