GeoChip Prototype and 1.0

The first functional gene array was constructed with 763 genes involved in nitrogen cycling (nirS, nirK, nifH, amoA), methane oxidation (pmoA), and sulfite reduction (dsrAB) (Tiquia et al., 2004). Then, a similar expanded array was developed with 2402 genes involved in organic contaminant biodegradation and metal resistance (Rhee et al., 2004). Those arrays were referred to as GeoChip 1.0.