Purification 46 Water treatment-- Purification 38 Proteins 24 Water 18 Dissertations, Academic (Ph.D) 16 Sewage 14 isolation & purification 14 Enzymes 13 Biochemistry 11 Water purification 11 Biotechnology 10 Sewage-Purification 10 analysis 10 Water-Purification 9 Analysis 8 methods 7 Molecular cloning 6 Protein purification 6 Chemistry 5 Chromatographic analysis 5 Chromatography 5 DNA 5 Isolation 5 Nanostructured materials 5 Proteins-- Peptides-- Amino acids-- Hemoglobin 5 Thesis (Ph.D)-Chemistry 5 Water reuse 5 Bioremediation 4 Enzyme purification 4 Laboratory manuals 4