"Diffraction by helical structures"

Date:
1956-1957
Reference:
PP/CRI/H/2/17
Catalogue details

Licence: In copyright

Credit: "Diffraction by helical structures". Source: Wellcome Collection.

    23/98
    * l6 n*& angular component of the helical projection down M ; is the transform of the (2n)^ component and so on* Comparing the <Vw© v : sOfcita&r^àd fulfil lines of C32t) 9 ye see that & , -Li OM w f (r) Qyj Jnverstóy we ■oäfiBKL have ít'N'W-/« («) N°te that by comparing equations (2IJ.) and U<>) we can identify Jf n (r) (for a particular pair (n, £ ) ) and g nj ^ (r) f thus establishing the connection between the fall three-dimensional Courier synthesis and the limited synthesis of a helical projection. Equations (2J) and. £Lf) between them show us how to construct the helically projected electron density* if we know the relvena feet of G nf ^ (R). A synthesis of this kind is being carried out for TM7 by Franklin ( ¡private communication) using a limited number of Gy, whose phases she has determined by isoiaorphous replacement# particular value of such a procedure in a substance as complex as IW is that ^ } c k C&av -^K. A4±&4aJ~ 4a^V. The ,:*S ^ \ We now go on to derive the equations for constructing a cylindrical! projection, as defined In section K „Let us denote the cylindrical projection by ç ^hen^for a continuous distribution - J <tc fo) ~ \ ¿ v V<e 1 y c Vt )