37 research outputs found
Mg/O<sub>2</sub> Battery Based on the Magnesium-Aluminum Chloride Complex (MACC) Electrolyte
Mg/O<sub>2</sub> cells employing
a MgCl<sub>2</sub>/AlCl<sub>3</sub>/DME (MACC/DME) electrolyte are
cycled and compared to cells with
modified Grignard electrolytes, showing that performance of magnesium/oxygen
batteries depends strongly on electrolyte composition. Discharge capacity
is far greater for MACC/DME-based cells, while rechargeability in
these systems is severely limited. The Mg/O<sub>2</sub>-MACC/DME discharge
product comprises a mixture of Mg(ClO<sub>4</sub>)<sub>2</sub> and
MgCl<sub>2</sub>, with the latter likely formed from slow decomposition
of the former. The presence of Cl in these compounds suggests that
the electrolyte participates in the cell reaction or reacts readily
with the initial electrochemical products. A rate study suggests that
O<sub>2</sub> diffusion in the electrolyte limits discharge capacities
at higher currents. Formation of an insulating product film on the
positive electrodes of Mg/O<sub>2</sub>-MACC/DME cells following deep
discharge increases cell impedance substantially and likely explains
the poor rechargeability. An additional impedance rise consistent
with film formation on the Mg negative electrode suggests the presence
of detrimental O<sub>2</sub> crossover. Minimizing O<sub>2</sub> crossover
and bypassing charge transfer through the discharge product would
improve battery performance
Health Economic Impact of a Multicenter Quality-of-Care Initiative for Reducing Unplanned Healthcare Utilization Among Patients With Inflammatory Bowel Disease
The state of the Martian climate
60°N was +2.0°C, relative to the 1981–2010 average value (Fig. 5.1). This marks a new high for the record. The average annual surface air temperature (SAT) anomaly for 2016 for land stations north of starting in 1900, and is a significant increase over the previous highest value of +1.2°C, which was observed in 2007, 2011, and 2015. Average global annual temperatures also showed record values in 2015 and 2016. Currently, the Arctic is warming at more than twice the rate of lower latitudes
A communal catalogue reveals Earth's multiscale microbial diversity
Our growing awareness of the microbial world's importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable bacterial and archaeal ribosomal RNA gene sequences to be followed across multiple studies and allow us to explore patterns of diversity at an unprecedented scale. The result is both a reference database giving global context to DNA sequence data and a framework for incorporating data from future studies, fostering increasingly complete characterization of Earth's microbial diversity.Peer reviewe
A communal catalogue reveals Earth’s multiscale microbial diversity
Our growing awareness of the microbial world’s importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable bacterial and archaeal ribosomal RNA gene sequences to be followed across multiple studies and allow us to explore patterns of diversity at an unprecedented scale. The result is both a reference database giving global context to DNA sequence data and a framework for incorporating data from future studies, fostering increasingly complete characterization of Earth’s microbial diversity