Unit Cell Measurements of Wet and Dry Crystalline Turnip Yellow Mosaic Virus

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CBYSTALS of turnip yellow mosaic virus, kindly sent to us by Dr. Kenneth Smith and Dr. Roy Markham (see Nature, July 17, p. 88), were examined both optically and by X-ray diffraction in this Laboratory. The crystals were small, isotropic, less than 0·1 mm. in size and ill-formed, but just sufficiently developed to indicate that they were octahedral bipyramids. The smaller crystals, first observed by Smith and Markham under a 1/12 oil immersion lens1, are better formed and display a better development of this form. Following Federov‘s law on the relation between lattice development and crystal form, these crystals should possess a face-centred lattice.

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    Markham, R., and Smith, K. M., Nature, 157, 300 (1946).

  2. 2

    Markham, R., Matthews, R. E. F., and Smith, K. M., Nature, 162, 88 (1948).

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    Bernal, J. D., and Fankuchen, I., J. Gen. Physiol., 25, 111 (1941).

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    Boyes-Watson, J., Davidson, E., and Perutz, M. F., Proc. Roy. Soc., A., 191, 83 (1947).

  5. 5

    Unpublished data.

  6. 6

    Cosslett, V. E., and Markham, R., Nature, 161, 250 (1948).

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BERNAL, J., CARLISLE, C. Unit Cell Measurements of Wet and Dry Crystalline Turnip Yellow Mosaic Virus. Nature 162, 139–140 (1948) doi:10.1038/162139a0

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