A versatile optode system for oxygen, carbon dioxide, and pH measurements in seawater with integrated battery and logger

Herein, we present a small and versatile optode system with integrated battery and logger for monitoring of O-2, pH, and pCO(2) in seawater. Three sensing materials designed for seawater measurements are optimized with respect to dynamic measurement range and long-term stability. The spectral properties of the sensing materials were tailored to be compatible with a commercially available laboratory oxygen logger that was fitted into a pressure housing. Interchangeable sensor caps with appropriate "sensing chemistry" are conveniently attached to the end of the optical fiber. This approach allows using the same instrument for multiple analytes, which offers great flexibility and minimizes hardware costs. Applications of the new optode system were demonstrated by recording depth profiles for the three parameters during a research cruise in the Baltic Sea and by measuring surface water transects of pH. The optode was furthermore used to monitor the concentration of dissolved oxygen in a seagrass meadow in the Limfjord, Denmark, and sensor packages consisting of pO(2), pH, and pCO(2) were deployed in the harbors of Kiel, Germany, and Southampton, England, for 6 d. The measurements revealed that the system can resolve typical patterns in seawater chemistry related to spatial heterogeneities as well as temporal changes caused by biological and tidal activity

Transformative action towards regenerative food systems: A large-scale case study

We urgently need to foster regenerative food systems that mutually reinforce human and ecological health. However, we have limited understanding of the action pathways that could encourage the emergence of such systems. Here we report on an extensive Three Horizons futures process, conducted with diverse participation from food system researchers and practitioners, to identify core domains of action for transforming the food system of Yorkshire, UK, towards a regenerative future. After establishing the contrast between the current degenerative and envisioned future regenerative food system, six core action domains were identified that require support to enable transformation: 1) enhancing supply chain connectivity and innovation to support diverse hybrid business ecosystems; 2) scaling environmentally beneficial and regenerative farming; 3) empowering citizens to reshape food demand; 4) providing trusted, accessible knowledge support for standards and incentives; 5) supporting schools and young people as drivers of long-term change; and 6) ensuring coordination and mutual support across domains. Our results highlight the importance of efforts to cohere synergic action, ambitious visioning, and addressing issues of power. Overall, our study sets an ambitious standard for co-developing action priorities to encourage regenerative futures

Using oxygen-consuming thermoset plastics to generate hypoxic conditions in microfluidic devices for potential cell culture applications

The precise control of the oxygen concentration in a cellular environment allows the study of cells under physiologically relevant conditions. This work reports on a novel method for the generation of reduced dissolved oxygen concentrations in microfluidic chambers for cell- and organ-on-chip applications. Using a thermoset polymeric material (OSTEMERTM), which effectively scavenges dissolved oxygen (DO), microfluidic devices have been fabricated where oxygen was rapidly depleted from the microfluidic chamber. It is shown that hypoxic and anaerobic conditions can be generated through the inherent scavenging property of the material itself, without any additional chemical additives. </p