Figure 2. (IMAGE) Osaka University Caption (a) Temperature increases observed with hybrid sensors in air, water, oil, and inside cell. These results are consistent with the idea that higher temperature increases occur in solvents with smaller thermal conductivities. The literature values for the thermal conductivities of air, water, and oil are 0.026, 0.61, and 0.135 W/m* K, respectively. (b) Bright field microscopic image of a HeLa cell with a hybrid sensor inside. Credit Osaka University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.