(C) 2009 American Association of Oral and Maxillofacial Surgeons”
“Minority carrier diffusion
length in p-type Sb-doped ZnO nanowires was measured as a function of temperature and forward bias injection duration. The minority carrier diffusion length displays a thermally activated length increase with the energy of 144 +/- 5 meV. The forward bias injection exhibits an increase in diffusion length with the activation energy of 217 +/- 20 meV, indicating the possible involvement of a Sb(Zn)-2V(Zn) acceptor complex. (C) 2011 American Institute of Physics. [doi:10.1063/1.3633224]“
“Tests were carried out to determine whether variations in the hydraulic architecture of eight Populus deltoidesxPopulus nigra genotypes could be related to variations in leaf function
and growth performance. Measurements Fosbretabulin cost were performed in a coppice plantation on 1-year-old shoots under optimal irrigation. Hydraulic architecture was characterized through estimates of hydraulic efficiency (the ratio of conducting sapwood area to leaf area, A(X):A(L); leaf- and xylem-specific hydraulic conductance of defoliated shoots, k(SL) and k(SS), respectively; apparent whole-plant leaf-specific hydraulic conductance, k(plant)) and xylem safety (water potential inducing 50% loss in hydraulic conductance). The eight genotypes spanned a significant range of k(SL) from 2.63 kg s(-1) m(-2) MPa-1 to 4.18 kg s(-1) m(-2) MPa-1, variations selleck being mostly driven by k(SS) rather than A(X):A(L). There was a strong trade-off between hydraulic efficiency and xylem safety. Values
Tanespimycin molecular weight of k(SL) correlated positively with k(plant), indicating that high-pressure flowmeter (HPFM) measurements of stem hydraulic efficiency accurately reflected whole-plant water transport efficiency of field-grown plants at maximum transpiration rate. No clear relationship could be found between hydraulic efficiency and either net CO2 assimilation rates, water-use efficiency estimates (intrinsic water-use efficiency and carbon isotope discrimination against C-13), or stomatal characteristics (stomatal density and stomatal pore area index). Estimates of hydraulic efficiency were negatively associated with relative growth rate. This unusual pattern, combined with the trade-off observed between hydraulic efficiency and xylem safety, provides the rationale for the positive link already reported between relative growth rate and xylem safety among the same eight P. deltoidesxP. nigra genotypes.”
“Nano-fibrous hydroxyapatite/chitosan (HA/CS) composites with HA contents of 070 wt % were prepared by in situ hybridization with a preprepared chitosan film as semipermeable membrane to slow down the hybridization process.