Mathematical description of microbiological reactions involving intermediates

✍ Scribed by Jeanne M. VanBriesen; Bruce E. Rittmann

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 256 KB
• Volume: 67
• Category: Article
• ISSN: 0006-3592
• DOI: 10.1002/(sici)1097-0290(20000105)67:1<35::aid-bit5>3.0.co;2-g

✦ Synopsis

Stoichiometric relationships for biological reactions involving intermediate formation are developed from microbial reaction fundamentals and thermodynamic principles. Biological reactions proceed through intermediates, which sequester carbon and electrons whenever their degradation is relatively slow. Modeling intermediate formation and subsequent utilization requires evaluation of the distribution of electrons, energy, and macronutrients (C and N) between energygenerating pathways and cell-synthesis pathways for each step in the mineralization of the primary electrondonor substrate. We describe how energy and electron balances are utilized to predict the stoichiometry for each step of a multi-step degradation process. Each stoichiometric relationship developed predicts substrate utilization, cell growth, and the formation of other products (e.g., H 2 CO 3 or H + ) for one step in the pathway to full mineralization. A modeling example demonstrates how different kinetics for each step in the degradation of nitrilotriacetic acid (NTA) leads to observed patterns in experimental results, such as a delay in the release of H 2 CO 3 after NTA is removed from solution.