Increased Mutation Rate from Aged Datura Pollen.

نویسندگان

  • J L Cartledge
  • M J Murray
  • A F Blakeslee
چکیده

are not comparable with measures of the fainter and more remote systems. The surprisingly small dispersion about the curve again emphasizes the general similarity in linear dimensions of the globular clusters of the galactic system. The plotted crosses refer to clusters whose computed distances involve only the earlier measures of diameter and integrated magnitudes; the distances for the others are based chiefly on magnitudes of bright stars and variables. The open circle represents N. G. C. 4147. A study of the deviations from the mean curve of figure 1 shows no systematic relation of deviation to class of cluster or to galactic latitude. This lack of correlation with latitude is unexpected, in view of the effect on the measurement of distances that space absorption in low latitudes should produce. It may indicate that the angular diameters and the apparent total brightness are about equally undermeasured wherever the absorption is serious.

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عنوان ژورنال:
  • Proceedings of the National Academy of Sciences of the United States of America

دوره 21 11  شماره 

صفحات  -

تاریخ انتشار 2005