The effect of narrow bandwidth infrared radiation on the growth of Escherichia coli

While broad band infrared has a number of biomedical applications, the effects with specific wavelengths on biomolecule remain unclear. In this study, narrow band infrared plasmonic thermal emitters with peak wavelengths from 3.0 to 5.0 μ m were developed to irradiate Escherichia coli ( E. coli ) cultures for 24h. It was found that with peak wavelengths at 4.0, 4.5, and 5.0 μ m, they could promote the growth of cells. Systems biology analyses were performed to investigate the underlying molecular mechanisms. Furthermore, specific wavelengths (4.0-5.0 μ m) induced the expression of transporters and enzymes involved in metabolism and respiration, thus stimulating the proliferation of E. coli .