The role of defects in the persistent photoconductivity of BaSnOthin films.

Time-dependent photoconductivity (PC) and PC spectra have been studied in oxygen deficient BaSnOthin films grown on different substrates. X-ray spectroscopy measurements show that the films have epitaxially grown on MgO and SrTiOsubstrates. While on MgO the films are nearly unstrained, on SrTiOthe resulting film is compressive strained in the plane.

Mucin-derived O-glycans supplemented to diet mitigate diverse microbiota perturbations.

Microbiota-accessible carbohydrates (MACs) are powerful modulators of microbiota composition and function. These substrates are often derived from diet, such as complex polysaccharides from plants or human milk oligosaccharides (HMOs) during breastfeeding. Host-derived mucus glycans on gut-secreted mucin proteins serve as a continuous endogenous source of MACs for resident microbes; here we investigate the potential role of purified, orally administered mucus glycans in maintaining a healthy microbial community.

Modification of the photoconducting properties of ZnO thin films via low-temperature annealing and air exposure.

A simple thermal annealing at 150 °C followed by exposure to air ambient conditions in epitaxial ZnO thin films produces a photoconductivity enhancement and a reduction of the energy gap. The first effect is related to a release of carriers from bulk traps while the second is caused by a gradual adsorption of species on the film surface which increases the band bending, as x-ray photoemission spectroscopy (XPS) shows. An observed drift of the photoconductivity and the energy gap over the days is connected to this adsorption kinetics.

The s-d exchange model as the underlying mechanism of magnetoresistance in ZnO doped with alkali metals.

High field magnetoresistance has been studied in epitaxial n-type ZnO:Na and ZnO:Li thin films in a temperature range between 4 K and 150 K. The resulting negative magnetoresistance can be well fitted using a semiempirical model of Khosla and Fischer based on third order contributions to the s-d exchange Hamiltonian. The parameters obtained from this model were carefully analyzed.