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- W2027351344 abstract "In this article, we have extensively studied and discussed the magnetic properties of acidic ferric hemoglobin and its isolated chains. The magnetic susceptibility, EPR and optical spectra of those samples were measured in the temperature region below 77°K. By the magnetic susceptibility measurements, it could be made clear that at an acidic pH value, both ferric hemoglobin and its isolated chains were constituted of a mixture of two spin states (high-spin state S = 52 and low-spin state S-12) and the ratio of this mixture varied in each protein sample, but was independent of the temperature change below 77°K. The co-existence of these two components could be ascertained by the observation of EPR spectra at liquid hydrogen temperature. Acidic ferric hemoglobin and its isolated chains exhibited the two components of EPR spectra which corresponded to their magnetic susceptibility, and it was found that the relaxation time of the low-spin state was longer than that of the high-spin state. The low-spin component of EPR spectra was almost undetectable at liquid nitrogen temperature. The three principal g values of this low-spin were gz = 2.80, gy = 2.20, and gx = 1.70. At alkaline pH values these low-spin components and the high-spin component of EPR spectra were displaced by the different low-spin spectra which corresponded to the ferric hemoglobin-hydroxide complex. It seems that the magnetic properties of the high-spin component are the same as the acidic ferric myoglobin, and the fine structure of the iron ion also seems to be same. Optical spectroscopy also gave similar magnetic properties which corresponded to the magnetic measurements." @default.
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- W2027351344 date "1971-12-01" @default.
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- W2027351344 title "A magnetic study of acidic ferric hemoglobin" @default.
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- W2027351344 doi "https://doi.org/10.1016/0005-2795(71)90116-4" @default.
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