Figure 2.

SQUID scans for B. megaterium QM B1551 spores, (a) and (b), and vegetative B. cereus cells, (c) and (d). (a) Field sweep measurement at 5 K, with the solid line corresponding to Equation (3) fitted with parameters N = 1.55 × 10²²  kg⁻¹ and m = 5.9; (b) Temperature sweep data at a magnetic field of 1,000 Oe; the solid line corresponds to equation (5) fitted with parameter C = 1.06m³ K kg⁻¹; (c) Field dependency measurement at 5 K; (d) Temperature dependency measurement at a magnetic field strength of 1,000 Oe. The circled region in (a) is magnified to show that spores do not exhibit hysteresis; the apparent coercive field of 10 Oe arises due to trapped flux in the superconducting coils. Key: circles, data for B. megaterium spores; in the magnified region, triangles refer to virgin curve up and the hysteresis sweep up; diamonds refer to the hysteresis sweep down. Error bars indistinguishable when plotted