chemistry background (and has published a number of physical chemistry studies investigating the compatibility of the RNA world hypothesis with a hydrothermal vent origin of life), but has also published extensively in the social sciences area, for example applying evolutionary concepts to other 'life-like' systems, such as social insect colonies and human civilizations.
Fig 7 - Viewing a metabolism as a cycle seems to be only half the story. Nutrients go in and waste comes out. This is a throughput, not a cycle. Also the diagram does not indicate whether the ribozymes are made by the cycle. I think there is some room for improvement in this diagram.