Application of rRNA-targeted oligonucleotide probes in the analysis of microbial communities in activated sludge DNA Extraction from Activated Sludge for Molecular Community Analysis A cellular automata model of a biological wastewater treating system Population dynamics and community structure of bacteria in an industrial phenol-degrading process analyzed with Temperature Gradient Gel Elec trophoresis (TGGE) Application of polymerase chain reaction-denaturing gradient gel electro-(phoresis) (PCR-DGGE) to the analysis of changes of microbial ecological communities in activated sludge systems