Water-oxidizing complex in Photosystem II: Its structure and relation to manganese-oxide based catalysts

Abstract

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Mixed oxide nanotubes in nanomedicine: A dead-end or a bridge to the future?

“…It was predicted that the chemical diversity and dimensions of the MONs of the Ti-based alloys possess interesting electronic and physical characteristics, which can be modulated for a wide range of purposes [ 71 , 180 ]. From this viewpoint, organized arrays of MONs on Ti–Mn alloy with α + β microstructure can be a prospective material as both TiO2 and Mn2O3 are extensively employed in energy applications [ 181 , 182 ]. In addition to this type of approach, the microstructural properties, mechanical behavior, and biocompatibility of low-cost β-type Ti-(6–18)Mn alloys were examined after the solution treatment, where Ti–9Mn showed the best combination of tensile strength and elongation among the fabricated alloys, and comparable or superior to those of Ti–6Al–4V ELI, for every parameter evaluated.…”

High-resolution cryo-EM structure of photosystem II reveals damage from high-dose electron beams

“…In order to elucidate the mechanism of the water-splitting reaction, the structure of PSII has been studied extensively by X-ray diffraction (XRD) with synchrotron radiation (SR) 2 – 8 and a number of spectroscopic methods including extended X-ray absorption fine structure (EXAFS) and electron paramagnetic resonance measurements 9 . The SR structure of PSII at an atomic resolution revealed that OEC is a Mn 4 CaO 5 cluster organized into a distorted-chair form, in which the cuboidal part is composed of Mn 3 CaO 4 and the outer manganese is attached to the cuboid via two μ-oxo-bridges 6 .…”

Diversity in the Family of Manganese Oxides at the Nanoscale: From Fundamentals to Applications

“… 4 More than 30 different crystalline forms of manganese oxides are found in nature that are spontaneously depleted through water and surface groundwater during the weathering of igneous and metamorphic rocks. 5 These naturally occurring manganese oxides participate in diverse natural chemical reactions and thus determines the arability of soils and sediments, the composition of natural waters, and the potability of both surface and subsurface waters. Complex manganese oxides are very reactive and fine grained materials and govern significant roles that are important to life on Earth, such as transport of minerals, oxygen cycling in the water column, and biomineralization.…”