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Themed collection PCCP Perspectives

71 items - Showing page 1 of 2
Perspective

Using anion photoelectron spectroscopy of cluster models to gain insights into mechanisms of catalyst-mediated H2 production from water

Anion PE spectroscopy and DFT calculations reveal molecular and electronic structural features of cluster models for catalysis.

Graphical abstract: Using anion photoelectron spectroscopy of cluster models to gain insights into mechanisms of catalyst-mediated H2 production from water
From the themed collection: PCCP Perspectives
Perspective

Intriguing structural, bonding and reactivity features in some beryllium containing complexes

We highlighted our contributions to Be chemistry which include bond-stretch isomerism in Be32− species, Be complexes bound with noble gas, CO, and N2, Be based nanorotors, and intriguing bonding situations in some Be complexes.

Graphical abstract: Intriguing structural, bonding and reactivity features in some beryllium containing complexes
From the themed collection: PCCP Perspectives
Perspective

The role of electron–nuclear coupling on multi-state photoelectron spectra, scattering processes and phase transitions

This article presents development of first principle based Beyond Born–Oppenheimer theory and its applications in conjunction with Jahn–Teller theory.

Graphical abstract: The role of electron–nuclear coupling on multi-state photoelectron spectra, scattering processes and phase transitions
From the themed collection: PCCP Perspectives
Open Access Perspective

Coupled transport of electrons and protons in a bacterial cytochrome c oxidase—DFT calculated properties compared to structures and spectroscopies

DFT calculated structures, vibrational frequencies, and energies provide insights into the reaction/proton pumping cycle of cytochrome c oxidase.

Graphical abstract: Coupled transport of electrons and protons in a bacterial cytochrome c oxidase—DFT calculated properties compared to structures and spectroscopies
Perspective

Spectroscopic evidence of n → π* interactions involving carbonyl groups

n → π* interactions involving carbonyl groups can be detected in solution by using common spectroscopic methods such as IR, UV-Vis, and NMR if the interactions are relatively strong (>1.5 kcal mol−1).

Graphical abstract: Spectroscopic evidence of n → π* interactions involving carbonyl groups
From the themed collection: PCCP Perspectives
Perspective

In silico investigation of Cu(In,Ga)Se2-based solar cells

State-of-the-art methods in materials science such as artificial intelligence and data-driven techniques advance the investigation of photovoltaic materials.

Graphical abstract: In silico investigation of Cu(In,Ga)Se2-based solar cells
From the themed collection: PCCP Perspectives
Perspective

Density functional theory based embedding approaches for transition-metal complexes

Density functional theory based embedding approaches for the description of chemical reactions are reviewed for their applicability to transition metal species.

Graphical abstract: Density functional theory based embedding approaches for transition-metal complexes
From the themed collection: PCCP Perspectives
Perspective

Assessing cluster models of solvation for the description of vibrational circular dichroism spectra: synergy between static and dynamic approaches

Solvation effects are essential for defining the shape of vibrational circular dichroism (VCD) spectra.

Graphical abstract: Assessing cluster models of solvation for the description of vibrational circular dichroism spectra: synergy between static and dynamic approaches
From the themed collection: PCCP Perspectives
Perspective

Temperature control in DRIFT cells used for in situ and operando studies: where do we stand today?

Heat transfer limitations in diffuse-reflectance-infrared-Fourier-transform-spectroscopy cells, which can affect the measurement in spectrokinetic studies, have been appraised.

Graphical abstract: Temperature control in DRIFT cells used for in situ and operando studies: where do we stand today?
From the themed collection: PCCP Perspectives
Perspective

Phonon, thermal, and thermo-optical properties of halide perovskites

Halide perovskites possess unusual phonon and thermal properties, which lead to unique thermo-optical responses very different from those of conventional inorganic semiconductors.

Graphical abstract: Phonon, thermal, and thermo-optical properties of halide perovskites
From the themed collection: PCCP Perspectives
Perspective

Energy conversion based on superhydrophobic surfaces

Different forms of energy conversion based on superhydrophobic surfaces.

Graphical abstract: Energy conversion based on superhydrophobic surfaces
From the themed collection: PCCP Perspectives
Perspective

Challenges and prospects of polyatomic ions’ intercalation in the graphite layer for energy storage applications

This review focuses on unraveling the reaction mechanisms of the intercalation of polyatomic ions into GICs by in situ techniques, correlated with computational studies.

Graphical abstract: Challenges and prospects of polyatomic ions’ intercalation in the graphite layer for energy storage applications
From the themed collection: PCCP Perspectives
Perspective

Molecular recognition at the air–water interface: nanoarchitectonic design and physicochemical understanding

Significant enhancements of binding constants for molecular recognition are observed at the air–water interface, which would be related to molecular recognition in biomolecular systems.

Graphical abstract: Molecular recognition at the air–water interface: nanoarchitectonic design and physicochemical understanding
From the themed collection: PCCP Perspectives
Perspective

Emerging trends in the dynamics of polyelectrolyte complexes

Polyelectrolyte complexes (PECs) exhibit varying dynamic responses depending upon the ionic strength, water content, temperature, pH, and molecular weight.

Graphical abstract: Emerging trends in the dynamics of polyelectrolyte complexes
From the themed collection: PCCP Perspectives
Perspective

Supramolecular and suprabiomolecular photochemistry: a perspective overview

This review article brings out current research trends in supramolecular and suprabiomolecular photochemistry, highlighting their possible applications in different areas.

Graphical abstract: Supramolecular and suprabiomolecular photochemistry: a perspective overview
From the themed collection: PCCP Perspectives
Perspective

Theory and algorithms for chiroptical properties and spectroscopies of aqueous systems

We review an atomistic, fully polarizable approach to accurately predict the chiroptical properties of molecular systems in aqueous solution, by retaining all relevant physico-chemical interactions.

Graphical abstract: Theory and algorithms for chiroptical properties and spectroscopies of aqueous systems
From the themed collection: PCCP Perspectives
Open Access Perspective

Recent progress in use and observation of surface hydrogen migration over metal oxides

An overview of catalysis related to hydrogen spillover, surface protonics, analysis techniques for hydrogen migration, and low-temperature catalysis using surface protonics are summarized.

Graphical abstract: Recent progress in use and observation of surface hydrogen migration over metal oxides
From the themed collection: PCCP Perspectives
Perspective

Disentangling the liquid phase exfoliation of two-dimensional materials: an “in silico” perspective

In this perspective article, recent advances in molecular simulation techniques have been reviewed to shed light on the complexity of liquid phase exfoliation of 2D materials.

Graphical abstract: Disentangling the liquid phase exfoliation of two-dimensional materials: an “in silico” perspective
From the themed collection: PCCP Perspectives
Perspective

2D materials towards ultrafast photonic applications

Two-dimensional materials are now excelling in yet another arena of ultrafast photonics, including optical modulation through optical limiting/mode-locking, photodetectors, optical communications, integrated miniaturized all-optical devices, etc.

Graphical abstract: 2D materials towards ultrafast photonic applications
From the themed collection: PCCP Perspectives
Open Access Perspective

Reorganization energies and spectral densities for electron transfer problems in charge transport materials

Various contributions to the outer reorganization energy of an electron transfer system and their theoretical and computational aspects have been discussed.

Graphical abstract: Reorganization energies and spectral densities for electron transfer problems in charge transport materials
From the themed collection: PCCP Perspectives
Perspective

Multifaceted aspects of charge transfer

Charge transfer is vital for life on Earth and makes our modern ways of living possible.

Graphical abstract: Multifaceted aspects of charge transfer
From the themed collection: PCCP Perspectives
Perspective

Asymmetric reactions induced by electron spin polarization

Spin polarized electrons can control asymmetric electrochemical reactions.

Graphical abstract: Asymmetric reactions induced by electron spin polarization
From the themed collection: PCCP Perspectives
Perspective

Energy dispersive X-ray diffraction (EDXRD) for operando materials characterization within batteries

This review highlights the efficacy of EDXRD as a non-destructive characterization tool in elucidating system-level phenomena for batteries.

Graphical abstract: Energy dispersive X-ray diffraction (EDXRD) for operando materials characterization within batteries
From the themed collection: PCCP Perspectives
Perspective

Polymer models for the mechanisms of chromatin 3D folding: review and perspective

In this perspective paper, classical physical models for mammalian interphase chromatin folding are reviewed.

Graphical abstract: Polymer models for the mechanisms of chromatin 3D folding: review and perspective
From the themed collection: PCCP Perspectives
Perspective

Nanoparticles influence miscibility in LCST polymer blends: from fundamental perspective to current applications

Polymer blending is an effective method that can be used to fabricate new versatile materials with enhanced properties.

Graphical abstract: Nanoparticles influence miscibility in LCST polymer blends: from fundamental perspective to current applications
From the themed collection: PCCP Perspectives
Open Access Perspective

Advances and challenges for experiment and theory for multi-electron multi-proton transfer at electrified solid–liquid interfaces

Understanding microscopic mechanism of multi-electron multi-proton transfer reactions at complexed systems is important for advancing electrochemistry-oriented science in the 21st century.

Graphical abstract: Advances and challenges for experiment and theory for multi-electron multi-proton transfer at electrified solid–liquid interfaces
From the themed collection: PCCP Emerging Investigators
Open Access Perspective

Towards molecular movies with X-ray photon correlation spectroscopy

We highlight perspective research opportunities of making molecular movies of biomolecular condensates and supercooled water using X-ray synchrotrons and XFELs.

Graphical abstract: Towards molecular movies with X-ray photon correlation spectroscopy
From the themed collection: PCCP Perspectives
Perspective

Soft XAS as an in situ technique for the study of heterogeneous catalysts

Perspectives on the use of soft X-ray absorption spectroscopy as a tool to rationally develop new heterogeneous catalysts.

Graphical abstract: Soft XAS as an in situ technique for the study of heterogeneous catalysts
From the themed collection: PCCP Perspectives
Perspective

Enantiospecificity in achiral zeolites for asymmetric catalysis

We highlight the recent study in using chiral and achiral porous materials for the potential applications in asymmetric catalysis.

Graphical abstract: Enantiospecificity in achiral zeolites for asymmetric catalysis
From the themed collection: PCCP Perspectives
Perspective

Quantum state and surface-site-resolved studies of methane chemisorption by vibrational spectroscopies

Infrared spectroscopic methods enable quantum-state-specific and surface-site-selective studies of methane chemisorption on stepped platinum surfaces.

Graphical abstract: Quantum state and surface-site-resolved studies of methane chemisorption by vibrational spectroscopies
From the themed collection: PCCP Perspectives
Perspective

Large cluster ions: soft local probes and tools for organic and bio surfaces

Large cluster projectiles boost molecular sensitivity in mass spectrometry and open new avenues for physical characterization and nanofabrication.

Graphical abstract: Large cluster ions: soft local probes and tools for organic and bio surfaces
From the themed collection: PCCP Perspectives
Perspective

Recent advances in MXenes and their composites in lithium/sodium batteries from the viewpoints of components and interlayer engineering

An up-to-date review about MXenes based on their distinguishing properties, namely, large interlayer spacing and rich surface chemistry.

Graphical abstract: Recent advances in MXenes and their composites in lithium/sodium batteries from the viewpoints of components and interlayer engineering
From the themed collection: PCCP Perspectives
Perspective

Piecewise linearity, freedom from self-interaction, and a Coulomb asymptotic potential: three related yet inequivalent properties of the exact density functional

Three properties of the exact energy functional of DFT are important in general and for spectroscopy in particular, but are not necessarily obeyed by approximate functionals. We explain what they are, why they are important, and how they are related yet inequivalent.

Graphical abstract: Piecewise linearity, freedom from self-interaction, and a Coulomb asymptotic potential: three related yet inequivalent properties of the exact density functional
From the themed collection: PCCP Perspectives
Perspective

Orientational ordering in heteroepitaxial water ice on metal surfaces

Sum frequency generation spectroscopy uncovers the orientational ordering in crystalline ice films of water grown on Pt(111) and Rh(111).

Graphical abstract: Orientational ordering in heteroepitaxial water ice on metal surfaces
From the themed collection: PCCP Emerging Investigators
Perspective

Polymer-based actuators: back to the future

This work demonstrates that polymer-based actuators play a key role in the area of smart materials and devices.

Graphical abstract: Polymer-based actuators: back to the future
From the themed collection: PCCP Perspectives
Perspective

Enzyme-based optical biosensors for organophosphate class of pesticide detection

A systematic review of enzyme based optical detection schemes for the detection and analysis of organophosphate pesticides has been presented.

Graphical abstract: Enzyme-based optical biosensors for organophosphate class of pesticide detection
From the themed collection: PCCP Emerging Investigators
Perspective

Morphology control, spectrum modification and extended optical applications of rare earth ion doped phosphors

This review summarizes the morphology control strategy, phase transfer theory, spectrum modulation, and extended optical applications of RE3+-doped phosphors.

Graphical abstract: Morphology control, spectrum modification and extended optical applications of rare earth ion doped phosphors
From the themed collection: PCCP Perspectives
Perspective

Rotational–vibrational resonance states

All molecular systems possess a significant number of rovibrational resonance states accessible via spectroscopic and scattering experiments, which can also be computed and rationalized by a variety of first-principles quantum-chemical techniques.

Graphical abstract: Rotational–vibrational resonance states
From the themed collection: PCCP Perspectives
Perspective

Hexagonal rare-earth manganites and ferrites: a review of improper ferroelectricity, magnetoelectric coupling, and unusual domain walls

In this review, the multiferroic properties, vortex domain patterns and non-stoichiometric effect in hexagonal rare-earth manganites and ferrites are discussed.

Graphical abstract: Hexagonal rare-earth manganites and ferrites: a review of improper ferroelectricity, magnetoelectric coupling, and unusual domain walls
From the themed collection: PCCP Perspectives
Perspective

Polarizable embedding QM/MM: the future gold standard for complex (bio)systems?

We provide a perspective of the induced dipole formulation of polarizable QM/MM, showing how efficient implementations will enable their application to the modeling of dynamics, spectroscopy, and reactivity in complex biosystems.

Graphical abstract: Polarizable embedding QM/MM: the future gold standard for complex (bio)systems?
From the themed collection: PCCP Perspectives
Perspective

Metal–organic framework-based nanomaterials for photocatalytic hydrogen peroxide production

Metal–organic frameworks act as efficient photocatalysts for visible-light driven hydrogen peroxide production in a single-phase system and two-phase system.

Graphical abstract: Metal–organic framework-based nanomaterials for photocatalytic hydrogen peroxide production
From the themed collection: PCCP Perspectives
Perspective

A revisit of the bond valence model makes it universal

The application of Pauling's principles to any type of chemical bond can be validated using recent quantum chemistry data (bond orders), thus making them universal.

Graphical abstract: A revisit of the bond valence model makes it universal
Open Access Perspective

Towards sustainable and efficient p-type metal oxide semiconductor materials in dye-sensitised photocathodes for solar energy conversion

In order to meet the ever-growing global energy demand for affordable and clean energy, it is essential to provide this energy by renewable resources and consider the eco-efficiency of the production and abundance of the utilised materials.

Graphical abstract: Towards sustainable and efficient p-type metal oxide semiconductor materials in dye-sensitised photocathodes for solar energy conversion
From the themed collection: PCCP Emerging Investigators
Perspective

Organic–inorganic hybrid perovskite electronics

Organic–inorganic hybrid perovskite is a leading successor for the next generation of (opto)electronics.

Graphical abstract: Organic–inorganic hybrid perovskite electronics
From the themed collection: PCCP Perspectives
Perspective

Probing radical–molecule interactions with a second generation energy decomposition analysis of DFT calculations using absolutely localized molecular orbitals

Proper treatment of intermolecular complexes formed by radicals and closed-shell molecules in energy decomposition analysis of DFT calculations.

Graphical abstract: Probing radical–molecule interactions with a second generation energy decomposition analysis of DFT calculations using absolutely localized molecular orbitals
From the themed collection: PCCP Perspectives
Open Access Perspective

Single-molecule functionality in electronic components based on orbital resonances

A gateable single-molecule diode and resonant tunneling diode are realized using molecular orbital engineering in multi-site molecules.

Graphical abstract: Single-molecule functionality in electronic components based on orbital resonances
From the themed collection: PCCP Perspectives
Perspective

Fragment-based quantum mechanical approach to biomolecules, molecular clusters, molecular crystals and liquids

To study large molecular systems beyond the system size that the current state-of-the-art ab initio electronic structure methods could handle, fragment-based quantum mechanical (QM) approaches have been developed over the past years, and proved to be efficient in dealing with large molecular systems at various ab initio levels.

Graphical abstract: Fragment-based quantum mechanical approach to biomolecules, molecular clusters, molecular crystals and liquids
From the themed collection: PCCP Perspectives
Perspective

High-throughput experimentation meets artificial intelligence: a new pathway to catalyst discovery

High throughput experimentation in heterogeneous catalysis provides an efficient solution to the generation of large datasets under reproducible conditions.

Graphical abstract: High-throughput experimentation meets artificial intelligence: a new pathway to catalyst discovery
From the themed collection: PCCP Perspectives
Perspective

Quantum electrocatalysts: theoretical picture, electrochemical kinetic isotope effect analysis, and conjecture to understand microscopic mechanisms

The fundamental aspects of quantum electrocatalysts are discussed together with the newly developed electrochemical kinetic isotope effect (EC-KIE) approach.

Graphical abstract: Quantum electrocatalysts: theoretical picture, electrochemical kinetic isotope effect analysis, and conjecture to understand microscopic mechanisms
From the themed collection: PCCP Emerging Investigators
Perspective

Intramolecular vibrational energy redistribution and the quantum ergodicity transition: a phase space perspective

The onset of facile intramolecular vibrational energy flow can be related to features in the connected network of anharmonic resonances in the classical phase space.

Graphical abstract: Intramolecular vibrational energy redistribution and the quantum ergodicity transition: a phase space perspective
From the themed collection: PCCP Perspectives
Open Access Perspective

Biomolecule–polymer hybrid compartments: combining the best of both worlds

Recent advances in bio/polymer hybrid compartments in the quest to obtain artificial cells, biosensors and catalytic compartments.

Graphical abstract: Biomolecule–polymer hybrid compartments: combining the best of both worlds
From the themed collection: PCCP Perspectives
Perspective

Universal crossed beam imaging studies of polyatomic reaction dynamics

Crossed-beam imaging studies of polyatomic reactions show surprising dynamics not anticipated by extrapolation from smaller model systems.

Graphical abstract: Universal crossed beam imaging studies of polyatomic reaction dynamics
From the themed collection: PCCP Perspectives
Open Access Perspective

Tumbling with a limp: local asymmetry in water's hydrogen bond network and its consequences

Ab initio molecular dynamics simulations of ambient liquid water and energy decomposition analysis have recently shown that water molecules exhibit significant asymmetry between the strengths of the two donor and/or the two acceptor interactions.

Graphical abstract: Tumbling with a limp: local asymmetry in water's hydrogen bond network and its consequences
From the themed collection: PCCP Perspectives
Perspective

DFT modelling of explicit solid–solid interfaces in batteries: methods and challenges

Density Functional Theory (DFT) calculations of electrode material properties in high energy density storage devices like lithium batteries have been standard practice for decades.

Graphical abstract: DFT modelling of explicit solid–solid interfaces in batteries: methods and challenges
From the themed collection: PCCP Perspectives
Perspective

Surface chemistry of TiO2 connecting thermal catalysis and photocatalysis

The surface chemistry of small molecules on TiO2 is reviewed with the aim to connect thermal catalysis and photocatalysis.

Graphical abstract: Surface chemistry of TiO2 connecting thermal catalysis and photocatalysis
From the themed collection: PCCP Perspectives
Perspective

Hierarchical phenomena in multicomponent liquids: simulation methods, analysis, chemistry

Complex, multicomponent, liquids benefit from a hierarchical understanding of solution speciation, collective organization and dynamics.

Graphical abstract: Hierarchical phenomena in multicomponent liquids: simulation methods, analysis, chemistry
From the themed collection: PCCP Perspectives
Perspective

Cold and controlled chemical reaction dynamics

State-to-state chemical reaction dynamics, with complete control over the reaction parameters, offers unparalleled insight into fundamental reactivity.

Graphical abstract: Cold and controlled chemical reaction dynamics
From the themed collection: Celebrating our 2021 Prizewinners
Perspective

What is “many-body” dispersion and should I worry about it?

“Many-body” dispersion can refer to two distinct phenomena, here termed electronic and atomic many-body effects, both of which cause the dispersion energy to be non-additive.

Graphical abstract: What is “many-body” dispersion and should I worry about it?
From the themed collection: PCCP Perspectives
Perspective

A new horizon for vibrational circular dichroism spectroscopy: a challenge for supramolecular chirality

The development of the solid state and time-step VCD methods opened a new horizon to reveal the mechanism of chirality amplification from microscopic to supramolecular scales.

Graphical abstract: A new horizon for vibrational circular dichroism spectroscopy: a challenge for supramolecular chirality
From the themed collection: PCCP Emerging Investigators
Perspective

Intrinsic nature of photocatalysis by comparing with electrochemistry

The kinetics of photocatalysis was discussed based on the calculated surface electric field, the limited electron transfer frequency and the irreversibility.

Graphical abstract: Intrinsic nature of photocatalysis by comparing with electrochemistry
From the themed collection: PCCP Perspectives
Perspective

Designing water splitting catalysts using rules of thumb: advantages, dangers and alternatives

Breaking the OH–OOH scaling relation does not necessarily enhance water splitting electrocatalysis. Seeking “electrocatalytic symmetry” is a suitable alternative.

Graphical abstract: Designing water splitting catalysts using rules of thumb: advantages, dangers and alternatives
From the themed collection: PCCP Emerging Investigators
Perspective

The challenging playground of astrochemistry: an integrated rotational spectroscopy – quantum chemistry strategy

Astrochemistry: toward the molecular complexity in the interstellar medium.

Graphical abstract: The challenging playground of astrochemistry: an integrated rotational spectroscopy – quantum chemistry strategy
From the themed collection: PCCP Perspectives
Open Access Perspective

High throughput sequencing of in vitro selections of mRNA-displayed peptides: data analysis and applications

High-throughput sequencing (HTS) of mRNA display selection of functional peptides.

Graphical abstract: High throughput sequencing of in vitro selections of mRNA-displayed peptides: data analysis and applications
From the themed collection: PCCP Perspectives
Perspective

Toward an understanding of electronic excitation energies beyond the molecular orbital picture

Can we gain an intuitive understanding of excitation energies beyond the molecular picture?

Graphical abstract: Toward an understanding of electronic excitation energies beyond the molecular orbital picture
From the themed collection: PCCP Perspectives
Perspective

Theory and simulation developments of confined mass transport through graphene-based separation membranes

The perspectives of graphene-based membranes based on confined mass transport from simulations and experiments for water desalination.

Graphical abstract: Theory and simulation developments of confined mass transport through graphene-based separation membranes
From the themed collection: PCCP Perspectives
Perspective

Probing ultracold chemistry using ion spectrometry

Reactions between KRb molecules at sub-microkelvin temperatures were probed using ion spectrometry.

Graphical abstract: Probing ultracold chemistry using ion spectrometry
From the themed collection: PCCP Perspectives
Perspective

Approaches to mid-infrared, super-resolution imaging and spectroscopy

Modern microscopy to access super-resolution infrared absorption of materials.

Graphical abstract: Approaches to mid-infrared, super-resolution imaging and spectroscopy
From the themed collection: PCCP Perspectives
Perspective

A review of mathematical representations of biomolecular data

Recently, machine learning (ML) has established itself in various worldwide benchmarking competitions in computational biology, including Critical Assessment of Structure Prediction (CASP) and Drug Design Data Resource (D3R) Grand Challenges.

Graphical abstract: A review of mathematical representations of biomolecular data
From the themed collection: PCCP Perspectives
Perspective

Spin-flip methods in quantum chemistry

This perspective discusses, theory, applications, and recent developments of spin-flip methods in quantum chemistry.

Graphical abstract: Spin-flip methods in quantum chemistry
From the themed collection: PCCP Perspectives
Open Access Perspective

Benchmark ab initio and dynamical characterization of the stationary points of reactive atom + alkane and SN2 potential energy surfaces

We review composite ab initio and dynamical methods and their applications to characterize stationary points of atom/ion + molecule reactions.

Graphical abstract: Benchmark ab initio and dynamical characterization of the stationary points of reactive atom + alkane and SN2 potential energy surfaces
From the themed collection: PCCP Perspectives
71 items - Showing page 1 of 2

About this collection

Welcome to our online collection of PCCP Perspective articles. Here we feature PCCP Perspective articles published in 2020.

Perspectives are high profile articles that present an authoritative state-of-the-art account of the selected research field. PCCP Perspectives take a wide variety of forms including personal accounts of research, critical analyses of topics of current interest and essential introductions to a field.

Congratulations to all the authors whose articles are featured and we hope readers enjoy this collection.

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