Dynamics of oxygen and carbon dioxide in rhizospheres of Lobelia dortmanna - a planar optode study of belowground gas exchange between plants and sediment.

Root-mediated CO uptake, O release and their effects on O and CO dynamics in the rhizosphere of Lobelia dortmanna were investigated. Novel planar optode technology, imaging CO and O distribution around single roots, provided insights into the spatiotemporal patterns of gas exchange between roots, sediment and microbial community. In light, O release and CO uptake were pronounced, resulting in a distinct oxygenated zone (radius: c.

Impact of age and body site on adult female skin surface pH.

Background: pH is known as an important parameter in epidermal barrier function and homeostasis.

Aim: The impact of age and body site on skin surface pH (pH(SS)) of women was evaluated in vivo.

Methods: Time domain dual lifetime referencing with luminescent sensor foils was used for pH(SS) measurements.