Form function of an isolated chain

Form function of an isolated chain 1.7.1 General properties... 

Let us check this conjecture experimentally. For this, we consider Fig. 15.25, in which are displayed the points with ordinates 7(0)//(q e) corresponding to four solutions at different concentrations. We multiply these ratios by q e) l/v, which is proportional to the asymptotic form function of an isolated chain in good solvent. If there is an interval... 

Scaling function related to the form function H(q) of an isolated chain in good solvent... 

The structure factor (or scattering function) only depends on the form factor of an isolated, noninteracting polymer chain, Soiq), the second-virial coefficient, V2, the fraction / of charged monomers, and the interaction between monomers, which in the present case is taken to be the DH potential i>dh( ) The structure factor of a noninteracting semiflexible polymer is characterized, in addition to the monomer... 

Inhibin and Activin. Inhibin, a water-soluble, gonadal factor known for over 50 years to inhibit pituitary function, has been isolated and identified (127—130). Inhibin is a glycoprotein hormone that preferentially inhibits the secretion of FSH. It consists of an a-chain subunit, mol wt 14,000, linked by disulfide bonds to a P-chain subunit, mol wt 18,000. There exist two forms of the P-chain subunit, P-A and P-B. The smaller subunit combines with either the P-A or P-B subunit to form inhibin-A or inhibin-B, respectively. 

Gordon et al. ° have obtained a discrete form of the partition function of Fixman for an isolated coil. Using some elegant mathematics involving the Mobius inversion, they have shown that the so called excluded volume can be re-included in an almost Markovian theory. The result is a convergent series for the expansion factor of a polymer coil and a clean formulation for the partition function for an isolated coil which, for all but very short chains, may be better than any previously available. 

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