Abstract
BY further purification of the crystalline protein preparation having the property of producing the mosaic virus disease in tobacco plants, F. C. Bawden, N. W. Pirie, J. D. Bernal and I. Fankuchen have obtained solutions which (in concentrations, greater than 2 per cent) separate into a lower liquid crystalline layer and an upper layer showing optical aniso-tropy when flowing. The liquids form gels on drying. X-ray investigations show a common pattern corresponding to a repeat unit of 3x22.2 A. in the crystal, liquid and gel stage; other features of the X-ray pattern indicate hexagonal close-packing in the gel stage and parallel, charged, rod-like molecules in solution. The authors estimate their length to be greater than 1000 A. and their width about one tenth of that length. This corresponds with a molecular weight agreeing with Svedberg's estimate of 17 x 10 . It is not yet conclusively proved, however, that these are actually the virus particles.
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Points from Foregoing Letters. Nature 138, 1060 (1936). https://doi.org/10.1038/1381060b0
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DOI: https://doi.org/10.1038/1381060b0
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