We compare results for the number-weighted mean radius and polydispersity obtained either by directly fitting number distributions to dynamic light scattering (DLS) data or by converting results obtained by fitting intensityweighted distributions. We find that results from fits using number distributions are angle independent. We find that converting intensity-weighted distributions is not alwa...

We compare results for the number-weighted mean radius and polydispersity obtained either by directly fitting number distributions to dynamic light-scattering data or by converting results obtained by fitting intensity-weighted distributions. We find that results from fits using number distributions are angle independent and that converting intensity-weighted distributions is not always reliabl...

The Flory theory for a single polymer chain is derived as the lowest order of a cumulant expansion. In this approach, the full original Flory free energy (including the logarithmic term), is recovered. The prefactors of the elastic and repulsive energy are calculated from the microscopic parameters. The method can be applied to other types of monomer-monomer interactions, and the case of a sing...

The health oftwo people connected by a social tie may be interdependent. The impact of the death of one spouse on the risk of death of the other, known as the widow/er effect, is a classic example (Parkes and Fitzgerald 1969; Lillard and Waite 1995; Martikainen and Valkonen 1996a; and Schaefer, Quesenberry, and Soora 1995). The impact of illness in one spouse on the risk of ill health or death ...