Why is massive star formation quenched in galaxy centers?

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A new study proposes that one of the reasons that slows down the rate at which massive stars form in galaxies is the existence of relatively large magnetic fields. Research has revealed that this process occurs around the center of the galaxy NGC 1097.
via Science Daily
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The electronic origins of fluorescence in carbon nanotubes

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Scientists have studied the infrared fluorescence of carbon nanotubes (rolled-up sheets of graphene). The frequency of infrared emission depended on the molecules bonded to the tube walls. By applying electrical potentials, they found that changes in the electron energy levels of carbon, induced by the attached molecules, were consistent with the frequency shifts. This allows the design of carbon nanotubes for bio-imaging, with tunable fluorescence by chemical modification.
via Science Daily