Purification Water 14 Proteins 12 Sewage 12 isolation & purification 8 Dissertations, Academic (Ph.D) 5 Isolation 4 Biotechnology 3 Enzymes 3 Laboratory manuals 3 Water treatment plants 3 analysis 3 Analysis 2 Biological treatment 2 Chemicals 2 Chemistry 2 Environmental aspects 2 Genetic Engineering 2 Molecular cloning 2 Nanostructured materials 2 Organic compounds removal 2 Polymerase chain reaction 2 Sewage disposal plants 2 TECHNOLOGY & ENGINEERING / Environmental / Water Supply 2 Thesis (Ph.D)-Chemistry 2 Thesis (Ph.D)-Microbiology 2 Water reuse 2 experiments 2 laboratory manuals 2 methods 2