The effects of re-perfusion on the 31P n.m.r. spectrum of ischaemic rat hearts
نویسندگان
چکیده
(a) The pulse sequence used was pulsed magnetic-field gradient-90° pulse-pulsed magnetic-field gradient4elay-9O0 pulse-acquisition. Two values of the interval between saturation and observation pulses were used: A, 200ms; A, 75 ms. Typical error bars are indicated. (b) The pulse sequence used was 90,0-(z,180,0-r2),, zI = z2 = lms, n = 5 12. At the end of each r, the outputs of the two phase-sensitive detectors in quadrature, A and B, were sampled. T2 was calculated by least-squares fit of (A2+B2)+ against time to a single exponential. Oxygenation was measured on a haemoreflector. Typical error bars are indicated.
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