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What does F385/456 stand for?

F385/456 stands for fluorescence at 385- and 456-nm wave-lengths

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To determine whether cytosolic free calcium ([Ca2+]i) rises during low-flow ischemia and to determine the mechanisms responsible for contractile dysfunction, isolated rat hearts were studied during graded reductions of coronary flow. Indo1 fluorescence at 385- and 456-nm wave-lengths (F385/456) was used as an index of [Ca2+]i. 31P-magnetic resonance spectroscopy (MRS) was used to measure free energy of ATP hydrolysis (delta GATP), intracellular pH (pHi), and Pi in parallel experiments to determine whether these factors may be responsible for increasing diastolic [Ca2+]i or altering the [Ca2+]i-pressure relationship.