On Urobilin

@article{GarrodOnU,
  title={On Urobilin},
  author={A. Garrod and F. G. Hopkins},
  journal={The Journal of Physiology},
  volume={20}
}
THE earliest practical outcome of the application of the spectroscope to the study of the colouring matters of urine was the discovery by Jaffe", in 1868, of the substance which yields the well-known absorption band between the b and F lines of the solar spectrum. Jaff6 detected the presence of this pigment both in normal and morbid urines, and showed that it exists in them in part ready-formed, and in part as a precursor, or compound, of negative spectroscopic properties, which readily becomes… Expand

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References

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The expenses of this investigation were amongst those covered by grants from the Government Grants Committee of the
    the effect of dilution upon the spectrum of urobilin in acidified alcoholic solutions. Fig. 1. The specimen had a browin-orange colour