Peter Rez
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View article: pH variations enable guanine crystal formation within iridosomes
pH variations enable guanine crystal formation within iridosomes Open
Many animals produce vivid colors by reflecting and amplifying light with stacked guanine crystals within membrane-bound organelles called iridosomes. While the presence of guanine crystals in iridosomes is well documented, the mechanisms …
View article: Contrast by electron microscopy in thick biological specimens
Contrast by electron microscopy in thick biological specimens Open
The contributions of coherent bright‐field phase and incoherent dark‐field amplitude contrast are investigated for thick biological specimens. A model for a T4 phage is constructed and images simulated for both TEM and STEM phase contrast …
View article: Perspective on atomic-resolution vibrational electron energy-loss spectroscopy
Perspective on atomic-resolution vibrational electron energy-loss spectroscopy Open
Instrumentation developments in electron energy-loss spectroscopy in the scanning transmission electron microscope one decade ago paved the way for combining milli-electron volt energy resolution in spectroscopy with Ångström-sized electro…
View article: Perspective on Atomic-Resolution Vibrational Electron Energy-Loss Spectroscopy
Perspective on Atomic-Resolution Vibrational Electron Energy-Loss Spectroscopy Open
Instrumentation developments in electron energy-loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) one decade ago paved the way for combining milli-electronvolt energy resolution in spectroscopy with Ångström-…
View article: Controlled pH Alteration Enables Guanine Accumulation and Drives Crystallization within Iridosomes
Controlled pH Alteration Enables Guanine Accumulation and Drives Crystallization within Iridosomes Open
Many animals exhibit remarkable colors produced by the constructive interference of light reflected from arrays of intracellular guanine crystals. These systems are utilized for various purposes, including vision, camouflage, communication…
View article: Electron Ptychography Reveals Correlated Lattice Vibrations at Atomic Resolution
Electron Ptychography Reveals Correlated Lattice Vibrations at Atomic Resolution Open
In this paper we introduce an electron ptychography reconstruction framework, CAVIAR -- Correlated Atomic Vibration Imaging with sub-Angstrom Resolution -- that reveals an entirely new channel of information: spatial correlations in atomic…
View article: Atomic Resolution Mapping of Localized Phonon Modes in Silicon Grain Boundaries
Atomic Resolution Mapping of Localized Phonon Modes in Silicon Grain Boundaries Open
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View article: Atomic Resolution Tomography on Simulated Amorphous Silicon Nanoparticles
Atomic Resolution Tomography on Simulated Amorphous Silicon Nanoparticles Open
Electron microscopy images are inherently two-dimensional projections of three-dimensional objects.This difficulty has long been a focus in biology, resulting in the development of cryo-electron microscopy techniques, such as single-partic…
View article: Atomic resolution mapping of localized phonon modes at grain boundaries
Atomic resolution mapping of localized phonon modes at grain boundaries Open
Phonon scattering at grain boundaries (GBs) is significant in controlling nanoscale device thermal conductivity. However, GBs could also act as waveguides for selected modes. To measure localized GB phonon modes, meV energy resolution is n…
View article: Calculations of the Evolution of the Ca L<sub>23</sub> Fine Structure in Amorphous Calcium Carbonate
Calculations of the Evolution of the Ca L<sub>23</sub> Fine Structure in Amorphous Calcium Carbonate Open
Amorphous calcium carbonate (ACC) has been found in many different organisms. Biogenic ACC is frequently a precursor in the formation of calcite and aragonite. The process of structural transformation is therefore of great interest in the …
View article: A New Path to Nanoscale Cellular Analysis with Monochromated Electron Energy-Loss Spectroscopy
A New Path to Nanoscale Cellular Analysis with Monochromated Electron Energy-Loss Spectroscopy Open
High-spatial-resolution vibrational spectroscopy is one of the principal techniques for nanoscale compositional analysis in biological materials. Here, we present a new method for the analysis of whole-cell biological specimens through nan…
View article: Toward Compositional Contrast by Cryo-STEM
Toward Compositional Contrast by Cryo-STEM Open
Electron microscopy (EM) is the most versatile tool for the study of matter at scales ranging from subatomic to visible. The high vacuum environment and the charged irradiation require careful stabilization of many specimens of interest. B…
View article: Hydrogen as an aviation fuel
Hydrogen as an aviation fuel Open
Powering airplanes by hydrogen, as reported on by David Kramer in the December 2020 issue of Physics Today (page 27), is a nice theoretical idea that brings little practical benefit.Apart from the difficulties of handling hydrogen as a cry…
View article: The Chief Scientist is right, and why
The Chief Scientist is right, and why Open
Australians are responsible for some of the highest values of CO, emissions per person.To lower CO, emissions the most effective policy is to eliminate coal from power generation.In principle all electrical power generation in Australia co…
View article: Cellular pathways of calcium transport and concentration toward mineral formation in sea urchin larvae
Cellular pathways of calcium transport and concentration toward mineral formation in sea urchin larvae Open
Significance Organisms form mineralized skeletons, many of which are composed of calcium salts. Marine organisms extract calcium ions from sea water. One of the main unresolved issues is how organisms concentrate calcium by more than three…
View article: Cellular pathways of calcium transport and concentration towards mineral formation in sea urchin larvae
Cellular pathways of calcium transport and concentration towards mineral formation in sea urchin larvae Open
Sea urchin larvae have an endoskeleton consisting of two calcitic spicules. The primary mesenchyme cells (PMCs) are the cells that are responsible for spicule formation. PMCs endocytose sea water from the larval internal body cavity into a…
View article: What Are the Applications of meV EELS?
What Are the Applications of meV EELS? Open
Journal Article What Are the Applications of meV EELS? Get access Peter Rez, Peter Rez Arizona State University, Tempe, Arizona, United States Search for other works by this author on: Oxford Academic Google Scholar Katia March, Katia Marc…
View article: Manipulation of Optical Phonon Polaritons in Patterned SiO<sub>2</sub> Thin-Films
Manipulation of Optical Phonon Polaritons in Patterned SiO<sub>2</sub> Thin-Films Open
Journal Article Manipulation of Optical Phonon Polaritons in Patterned SiO2 Thin-Films Get access Kartik Venkatraman, Kartik Venkatraman SEMTE, Arizona State University, Tempe, Arizona, USA Corresponding author: [email protected] Search for…
View article: Atomic Resolution Vibrational Spectroscopy with On-Axis Detector Geometry
Atomic Resolution Vibrational Spectroscopy with On-Axis Detector Geometry Open
Journal Article Atomic Resolution Vibrational Spectroscopy with On-Axis Detector Geometry Get access Kartik Venkatraman, Kartik Venkatraman School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizon…
View article: Erratum: Identification of point defects using high-resolution electron energy loss spectroscopy [Phys. Rev. B <b>99</b>, 115312 (2019)]
Erratum: Identification of point defects using high-resolution electron energy loss spectroscopy [Phys. Rev. B <b>99</b>, 115312 (2019)] Open
Received 2 April 2019DOI:https://doi.org/10.1103/PhysRevB.99.169906©2019 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasDefectsDensity of statesPhysical SystemsWide band gap systemsTechniquesDensity functional theor…
View article: Identification of point defects using high-resolution electron energy loss spectroscopy
Identification of point defects using high-resolution electron energy loss spectroscopy Open
Although there are many techniques that can detect bandgap states associated with point defects in the lattice, it is not routinely possible to determine the type of defect at submicron spatial resolution. Here we show that high-resolution…
View article: Vibrational electron energy loss spectroscopy in truncated dielectric slabs
Vibrational electron energy loss spectroscopy in truncated dielectric slabs Open
Specially designed instrumentation for electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope makes it possible to probe very low-loss excitations in matter with a focused electron beam. Here we study the n…
View article: High Resolution EELS of Point Defects in a Nitride Semiconductor Material
High Resolution EELS of Point Defects in a Nitride Semiconductor Material Open
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View article: Spatially Resolved Vibrational Electron Energy-loss Spectroscopy Across an Abrupt SiO2/Si Interface
Spatially Resolved Vibrational Electron Energy-loss Spectroscopy Across an Abrupt SiO2/Si Interface Open
An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.
View article: Aloof-beam Vibrational Electron Energy-loss Spectroscopy of Adsorbate/Metal Particle Systems
Aloof-beam Vibrational Electron Energy-loss Spectroscopy of Adsorbate/Metal Particle Systems Open
An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.
View article: Interpreting Cation Displacements and Image Motifs Associated with the Oxygen Exchange Reaction on CeO2 Nanoparticles
Interpreting Cation Displacements and Image Motifs Associated with the Oxygen Exchange Reaction on CeO2 Nanoparticles Open
An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.