TTC and CuPc films are characterized by atomic force microscopy and x-ray diffraction. TTC forms a highly crystalline layer that passivates electron traps on the SiO(2)

surface very efficiently and serves as a template for the growth of CuPc films with significantly improved crystallinity. High electron mobilities comparable to the values reported on single GSK126 ic50 crystals are reached. We show that the contact resistance for hole transport as determined by the transmission line method can be reduced considerably by using organic charge-transfer complexes as top contacts in OFETs based on CuPc. (c) 2010 American Institute of Physics. [doi:10.1063/1.3354086]“
“Background: Age-related reductions in serum dehydroepiandrosterone (DHEA) concentrations may be involved in bone mineral density (BMD) click here losses.

Objective: The objective was to determine

whether DHEA supplementation in older adults improves BMD when co-administered with vitamin D and calcium.

Design: In year 1, a randomized trial was conducted in which men (n = 55) and women (n = 58) aged 65-75 y took 50 mg/d oral DHEA supplements or placebo. In year 2, all participants took open-label DHEA (50 mg/d). During both years, all participants received vitamin D (16 mu g/d) and calcium (700 mg/d) supplements. BMD was measured by using dual-energy X-ray absorptiometry. Concentrations of hormones and bone turnover markers were measured in serum.

Results: In men, no difference between groups occurred in any BMD measures or in bone turnover markers during year 1 or year 2. The free testosterone index and estradiol increased in the DHEA group only. In women, spine BMD increased by 1.7 +/- SN-38 0.6% (P = 0.0003) during year 1 and by 3.6 +/- 0.7% after 2 y of supplementation in the DHEA group; however, in the placebo group, spine BMD was unchanged during year 1 but increased to 2.6 +/- 0.9% above baseline during year 2 after the crossover to DHEA. Hip BMD did not change. Testosterone, estradiol, and insulin-like growth factor 1 increased in the DHEA group only. In both

groups, serum concentrations of bone turnover markers decreased during year 1 and remained low during year 2, but did not differ between groups.

Conclusion: DHEA supplementation in older women, but not in men, improves spine BMD when co-administered with vitamin D and calcium. This trial was registered at clinicaltrials.gov as NCT00182975. Am J Clin Nutr 2009;89:1459-67.”
“Nanocomposite CoFe-MgO films, where magnetic CoFe grains are embedded into an insulating MgO matrix, show a pronounced correlation between the tunneling magnetoresistance (TMR) and the magnetorefractive effect properties. The effect is due to the contribution of the spin-dependent conductivity to the optical conductivity of the films.