By R. J. P. Williams (auth.), Dr. Joe V. Bannister (eds.)

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The qualitative conclusion that has been drawn concerning the influence of divalent ions and temperature, for example, should be valid. But numerical results may still represent complicated averages over a host of molecular species. It is of primary importance to carry out such studies with truly homogeneous samples. The preparation of such samples is our primary goal at the moment. : Sedimentation equilibrium studies of a complex association reaction. Biophys. Chern. : Amino acid composition, aminoterminal analysis, and subunit structure of Cancer magister hemocyanin.

The crude Hcy obtained by the three methods presents a ratio 00280/00340 < 4. Disc Electrophoresis. We have employed the technique developed by Davis (1964). The quantities of protein present in the sample are 200 ~l per gel of crude Hcy, 100 ~g for the mixture of six subunits and 30 ~g for an isolated subunit. , 1974b). 30 are taken into account and classed in order of increasing mobility. The indexing letter is the first letter of the sub-species name or the variety where the subunit has first been identified (IH signifies that the subunit considered has the same mobility as the subuni t of A.

1970). ;---;, Fig. 4. Influence of ammonium sulphate on ! 4 - - - - - - unA 1 • Hcy dissociation provoked by urea 1 M. Direction of the TLG development indicated by arrow • (NH4~S04----· o ~ 10-4 10-3 10-11 10""1 1• order to eliminate the cations, then urea addition just until a 1 M concentration is achieved. 5. The dissociation products analysis shows in the three cases six subunits in equal quantity by disc electrophoresis and two spots in TLG (Fig. 4) of which there is a large spot composed of the monomeric subunits, 2, 3j 4, 5 and 6, and a small spot containing essentially subunit 1 (dimer).

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