single cell protein 4.1 Introduction 4.2 Conventional protein sources 4.4 Substrates for SCP production 4.5 Micro-organisms for SCP production 4.6 sCP from carbon dioxide 4.7 SCP from carbohydrates 4.8 SCP from hydrocarbons and derivatives 4.9 The Pruteen process-a case study Summary and objectives Resource material58 Single cell protein 4.1 Introduction 60 4.2 Conventional protein sources 60 4.3 Single cell protein 62 66 67 69 4.4 Substrates for SCP production 4.5 Micro-organisms for SCP production 4.6 SCP from carbon dioxide 4.7 SCP from carbohydrates 74 4.8 SCP from hydrocarbons and derivatives 85 4.9 The Pruteen process - a case study 88 Summary and objectives 106 Resource Material 107