Question
Diazirine groups can act as probes for MRI techniques based on this phenomenon used to image metabolic processes in vivo. For 10 points each:
[10h] Name this phenomenon that can be facilitated by SABRE techniques for amplifying signals. States with this property are characterized by spin-up population levels far higher than the equilibrium population predicted by the Boltzmann distribution.
ANSWER: hyperpolarization [accept hyperpolarized MRI]
[10e] Diazirine hyperpolarization probes typically use this element’s stable 15 isotope. Aziridines are analogous to epoxides but replace the oxygen atom with this element, which has one less proton.
ANSWER: nitrogen [accept N-15]
[10m] Using diazirine probes in NMR and MRI studies can increase resolution by increasing the duration of this process, which is quantified by the T1 and T2 times.
ANSWER: relaxation times [accept spin-lattice relaxation or spin-spin relaxation]
<JZ, Chemistry>
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