Different cells have different needs. Some are aerobic-they need oxegen-while others are anaerobic and do not require oxegen.>>All cells require nutrition.A properly formulated media contains the necessary nutrients to aloe cells to grow and produce.Thefermentor mixes the cell evenly throughout the media to suspend the cells and supply the oxygen necessary for growth.Effective and efficient fermentation requires rigorous monitoring and control of the environment within the bioreactor.Key factors include temperature,pressure,pH-with is a measure of how acidic or alkaline the media is ,oxygen-usually measured as dissolved oxygen within the media,and nutrient levels.Although the environment and the media are tailored to the needs of specific cells,the lifecycle of almost all batches follows a predictable pattern.The growth pattern has four phases: Lag ,Exponential or Log,Stationary and Death.>> When a cell is first introduction to fresh media,it has to adapt to its new environment.