Isoflavone (IFL) intake may provide numerous health benefits, but IFL bioavailability differences among soya foods remains uncertain. Urinary IFL excretion (UIE) was shown to provide a reliable surrogate for systemic IFL exposure and therefore can be used as a measure of ‘apparent bioavailability’ (AB). We investigated the AB of IFL in fourteen healthy adults, consuming two liquid and two solid soya foods in a crossover designed study. Volunteers consumed the foods with a self-selected breakfast, which was kept identical for all four soya items (soya nuts, soya milk, soya protein bar and soya protein powder drink in water; average 23·7 mg IFL, 88–96 % glycosides, by HPLC analysis) and collected all urine up to 26 h. Liquid foods showed initially higher UIE values than solid foods, but this difference was considerably reduced or disappeared entirely after 24–26 h. Conclusive AB results were obtained only after 24–26 h; earlier collections were not reliable. At 26 h, adjusted UIE values for daidzein (DE) were 20 μmol in the milk and bar and 17 μmol for the nut and powder; urinary genistein excretion was the highest in the milk group (10 μmol) followed by the nut, bar (both 6 μmol) and powder groups (5 μmol); the UIE for glycitein was the highest for bars (4 μmol), followed by powder and nuts (3 μmol), and milk (2 μmol). DE makes the largest contribution to urinary total IFL. The AB of IFL was found to be variable depending on the analyte and soya food consumed.

The purpose of the present study was to determine whether children experience a higher systemic exposure to isoflavonoids when consuming a body weight-adjusted dose of soya compared with adults. Forty study participants were recruited from a local Waldorf school, including twenty-one children and nineteen adults. Participants collected a baseline urine sample and ate immediately thereafter a body weight-adjusted dose of soya nuts (15 g/54·4 kg equivalent to 0·615 (sd 0·036) mg total isoflavones/kg) followed by a 12 h urine collection. Nineteen children and eighteen adults completed the protocol correctly (fourteen child–parent pairs). Children, compared with adults, showed a statistically significant (P < 0·05 by unpaired t test) higher urinary isoflavone excretion rate for daidzein (+39 %), genistein (+44 %), all non-metabolites (daidzein + genistein + glycitein; +41 %) and total isoflavonoids (+32 %). Isoflavones are more bioavailable in children v. adults. Urine is an excellent medium to determine systemic isoflavone exposure in children due to its non-invasiveness and high compliance, in particular when collected overnight; it also allows evaluation of completeness of specimen collection.

We consider a chiral smectic C liquid crystal confined between parallel plates in the bookshelf geometry. Using a recently proposed continuum theory for such materials the behaviour of the cell is discussed when an electric field is applied and subsequently removed from the cell. We examine both symmetric and asymmetric boundary conditions for the director.

Advance care directives for health care have been promoted as a way to improve end-of-life decision making. These documents allow a patient to state, in advance of incapacity, the types of medical treatments they would like to receive (a living will), to name a surrogate to make those decisions (a durable power of attorney for health care), or to do both. Although studies have shown that both physicians and patients generally have positive attitudes about the use of these documents, relatively few individuals have actually completed one.

What underlies this discrepancy between attitudes and behavior with regard to advance care directives? One obvious explanation is lack of access. Emanuel et al. estimated that approximately 90 percent of the population desire an advance care directive, and they pointed to access as the major barrier. Yet interventions that increase accessibility have typically failed to yield more than a 20 percent completion rate. Thus, it appears that access is not the sole determinant of advance care directive completion.