• Photochemical and photophysical processes in biomolecules are intimately involved in a multitude of functional processes, that include vision, photosynthesis, molecular recognition, gene replication, etc., and can be utilized in areas such as photodynamic therapy. (rsc.org)
  • We provide a comprehensive analysis of the photochemical and photophysical pathways of nanocaged RB to better understand how to control the function of RB as a photo-active ROS-therapeutic agent. (aiche.org)
  • Reported in this review are the photochemical and photophysical properties of a group of symmetric, multinuclear complexes of the general form [L′(CN) 4 M(CN)-(PtL 4 )-(NC)-M(CN) 4 L′] n- (where M is a Group 8 metal, L is an amine, and L′ is a σ-donor ligand) that provide for apparent photoinduced multielectron charge transfer. (princeton.edu)
  • Based on the detailed photochemical and photophysical characterization a molecular keypad lock and a D-latch memory device were developed and demonstrated. (uhu.es)
  • Our proposed mechanism integrates thermodynamic and reaction kinetics of the RB photo-oxidation reaction via the monitoring of the photochemical reactions with multiple spectroscopic techniques in tandem. (aiche.org)
  • Using small models of organic molecules adsorbed on small salt/water clusters, we reveal the photoinduced reactions and investigate their implication on atmospheric chemistry. (uibk.ac.at)
  • Through the attachment, chemical reactions are often induced. (uibk.ac.at)
  • Although photoinduced electron transfer reactions have been very intensively studied, several important questions still remain unanswered. (uzh.ch)
  • Certain reactions induced by light can be responsible for a detrimental decay of wine. (infowine.com)
  • Successful time-resolved crystallography studies have used the pump-probe approach, and the light-induced X-ray crystallographic difference densities have been assigned to reactions and excited-state processes. (nature.com)
  • Scientists built a small camera with a 'molecular glue,' which enables them to view chemical reactions in real-time. (techthoroughfare.com)
  • The entire capability of nanocrystals in semi-conductors and plasmons may now be investigated and photochemical reactions can concurrently be generated and observed. (techthoroughfare.com)
  • This effect can be used to modify reaction pathways of chemical and photo-chemical reactions. (su.se)
  • 2] Photochemical reactions proceed differently than temperature-driven reactions. (nationalvendingblog.com)
  • In the case of photochemical reactions, light provides the activation energy. (nationalvendingblog.com)
  • Photochemical paths access high energy intermediates that cannot be generated thermally, thereby overcoming large activation barriers in a short period of time, and allowing reactions otherwise inaccessible by thermal processes. (nationalvendingblog.com)
  • They possess easily accessible close-lying electronic states that lead to a plethora of complex and ultrafast photochemical processes during the first steps of energy conversion. (nature.com)
  • The creation and progression of the ultrafast structural dynamics strongly depends on optical and molecular parameters. (nature.com)
  • The topics span a wide range of disciplines, grounded in physical chemistry and chemical physics, and reaching into combustion, atmospheric and interstellar chemistry, heterogeneous catalysis, materials, photochemistry and ultrafast processes, and energy-related science. (grc.org)
  • The group works on a wide variety of topics involving photo chemistry, coherent control, polaritonic chemistry, ultrafast spectroscopy, and numerical methods related to quantum dynamics. (su.se)
  • Ultrafast hard X-ray sources make time-resolved diffraction experiments possible, paving the way to capture the nuclear dynamics of molecules in time as well as in space, with the "molecular movie" of a CoIn as the ultimate goal. (su.se)
  • The combination of covariance imaging with the Coulomb explosion of molecules induced by ultrafast lasers has allowed for direct imaging of the structure of complex polyatomic molecules on a femtosecond timescale, as illustrate in Figure 2. (ox.ac.uk)
  • His research interests are in the application of ultrafast X ray spectroscopy and scattering techniques to investigate atomic and electronic structural dynamics in condensed matter including transition-metal complexes, molecular dynamics in solution, and electronic phase transitions in correlated electron systems. (stanford.edu)
  • Femtosecond pump-probe spectroscopy using ultrafast optical and infrared pulses has become an essential tool to discover and understand complex electronic and structural dynamics in solvated molecular, biological, and material systems. (stanford.edu)
  • Photochemical and Photobiological Sciences (2012) 11 , 1151-1155. (nyu.edu)
  • Therefore, the excessive energy might react with ground state molecular oxygen which leads to production of reactive oxygen species (ROS) inside the photosynthetic machinery. (iapn.de)
  • Therefore, site-selective and orbital-specific K-edge soft X-ray spectroscopy techniques are used here to detect photo-induced proton dynamics in gaseous and liquid sample environments. (uni-potsdam.de)
  • Raman Spectroscopy and Molecular Imaging of Living Cells. (hamalab.com)
  • Hiro-o Hamaguchi, The 14th European Congress on Molecular Spectroscopy , Opatija, Croatia (2008.9). (hamalab.com)
  • In Vivo Molecular Imaging of Life and Death of Single Living Cells by Linear and Non-linear Raman Spectroscopy. (hamalab.com)
  • The photochemical reactivity and photophysics of these species are found to be a function of molecular geometry. (princeton.edu)
  • Can we model dissociation induced by IR photons using direct molecular dynamics simulations on GPUs? (uibk.ac.at)
  • In excited state molecular dynamics simulations, we have resolved the early steps in the photodissociation of ironpentacarbonyl. (nature.com)
  • Notably, we utilized a fluorescence-based oxygen sensor to monitor the concentration of molecular oxygen in real-time. (aiche.org)
  • Dissipation of absorbed light energy as heat energy is induced by the molecular mechanism of non-photochemical quenching (NPQ) and can be determined from measurements of chlorophyll fluorescence. (iapn.de)
  • Measurement of non-photochemical quenching (NPQ) by chlorophyll fluorescence: Due to reduced assimilation capacity, light energy is in excess to what can be used in photosynthesis and can damage the plant. (iapn.de)
  • Photochromic molecular switches (fluorophore-appended spiropyrans and a fulgimide) that can deliver distinct fluorescence responses depending on their ring-open and ring-closed states were investigated. (uhu.es)
  • The molecular apparatus behind biological photosynthesis retains its long-term functionality through enzymatic repair. (nature.com)
  • However, bioinspired molecular devices designed for artificial photosynthesis, consisting of a photocentre, a bridging ligand and a catalytic centre, can become unstable and break down when their individual modules are structurally compromised, halting their overall functionality and operation. (nature.com)
  • The camera collects lights in semiconductors, causing processes of electron transfer, such as photosynthesis, which can be examined using spectroscopic methods and gold nanoparticles. (techthoroughfare.com)
  • Decay processes towards energetically lower lying states in transient molecular geometries result in the formation of excited state relaxation pathways. (uni-potsdam.de)
  • Light induced chemical and physical processes in small organic-/inorganic-/bio-molecules have been a subject of experimental and theoretical research for several decades. (rsc.org)
  • Recent advances in high resolution spatio-temporal techniques have offered detailed understanding of excited state processes in small molecules. (rsc.org)
  • Photochemical tissue bonding (PTB) of wounds and surgical incisions relies on the use of photosensitive molecules and light to induce the formation of covalent linkages in collagenous tissue. (aiche.org)
  • In the course of such processes, photo-excitations promote molecules into thermally inaccessible excited states. (uni-potsdam.de)
  • The protonation of nitrogen (N) sites in organic molecules and the oxygen (O) atom in the water molecule are probed locally through transitions between 1s orbitals and the p-derived molecular valence electronic structure. (uni-potsdam.de)
  • We try to understand experimentally observed changes in spectroscopic properties induced by variation of ions in the solids (e.g. introduction of cobalt ions into MgO) and by adsorption of molecules on the surfaces. (uibk.ac.at)
  • The Molecular Interactions and Dynamics (MID) Gordon Research Conference has long served the physical chemistry and chemical physics communities, as topics touch on the interactions and dynamics in isolated molecules, clusters, solution, surfaces, interfaces, and biological systems. (grc.org)
  • With the advancement of cavity quantum electrodynamics and its recent application to molecules, using the quantum properties of light to control photo-chemistry has come into reach. (su.se)
  • Molecular Near-field Effect in Resonance Hyper-Raman Scattering and Detection of Ensembles of Single Molecules. (hamalab.com)
  • Coulomb explosion imaging has also been used to investigate the femtosecond nuclear motion in molecular photo-dissociation and in vibrationally excited molecules in real time. (ox.ac.uk)
  • Photoinduced charge transfer processes have been implicated in a variety of oxidative processes which ultimately lead to mutations, compromising the biological function of DNA. (rsc.org)
  • Interpretation of the mechanism and dynamics of photoexcited state processes is of paramount importance to understanding DNA oxidative damage. (rsc.org)
  • An oxidative pressure acid leaching process was investigated for the extraction of Ni/Co/Cu/Zn metal values from base metal smelter slags. (sharif.edu)
  • Acute solvent exposure induced activation of cytochrome P4502E1 causes proximal tubular cell necrosis by oxidative stress. (cdc.gov)
  • The mechanism and dynamics of photoinduced DNA and protein damage is critically important to our understanding of diseases associated with ultraviolet irradiation as well as to the development of photosensitized therapies. (rsc.org)
  • A team at Cambridge University developed the mechanism that integrates gold nanoparticles and small nanocrystals called quantum dots, with a molecular glue known as cucurbituril (CB). (techthoroughfare.com)
  • This information is used to construct the mechanism of the scattering process as a function of scattering angle. (ox.ac.uk)
  • Towards New Molecular Photocatalysts for CO2 Reduction: Photo-Induced Electron Transfer versus CO Dissociation within [Os(NN)(CO)2Cl2] Complexes. (univ-grenoble-alpes.fr)
  • We are interested both in the process of electron attachment that can be approached through modeling of potential energy curves in both neutral and anionic state, as well as in the induced chemistry. (uibk.ac.at)
  • Recent, ground breaking experiments have show that one can utilize the vacuum field of an optical nano-resonator to significantly modify the potential energy landscape and thus its photo-chemistry. (su.se)
  • Raman Spectroscopic Signature of Life and Cell Death at the Molecular Level. (hamalab.com)
  • Raman Spectroscopic Signature of Life" and Spontaneous Cell Death at the Molecular Level. (hamalab.com)
  • Here we report the active repair of such an artificial photosynthetic molecular device, leading to complete recovery of catalytic activity. (nature.com)
  • Under such conditions, the absorption of light in the light harvesting complexes of the photosystems is excessive, i.e., the available energy cannot be consumed by the photosynthetic processes. (iapn.de)
  • IAPN is conducting research on how photosynthetic processes are affected by the nutrient supply status: the spinach leaf shown here has visible symptoms of magnesium deficiency. (iapn.de)
  • The plant nutrient magnesium (Mg) plays crucial roles in photosynthetic processes. (iapn.de)
  • The research aims at understanding how the photosynthetic processes are affected at a range of Mg concentrations and corresponding how photoprotection is affected by Mg supply. (iapn.de)
  • In contrast, older iron formations were deposited in anoxic oceans , where ferrous iron oxidation by anoxygenic photosynthetic bacteria was likely an important process. (docslib.org)
  • On a molecular level, the energy contained in the electromagnetic radiation is transferred through photochemical processes into chemical or thermal energy. (uni-potsdam.de)
  • The photo-chemical relaxation mechanisms depend on the studied system itself, the interactions with its chemical environment and the character of the involved states. (uni-potsdam.de)
  • Transition metal ions serve as nanolaboratories to explore the most fundamental chemical processes with unprecedented detail. (uibk.ac.at)
  • The direct photo-electrochemical conversion of water and CO 2 into chemical fuels represents an exciting new pathway for the combined conversion and storage of solar energy. (uzh.ch)
  • The investigation of photoactive and/or fluorescent molecular switches is a field of chemical research with intensive worldwide activities. (uhu.es)
  • These rarely reported molecular logic devices depend not only on the aDolication of the �riaht� inDut information (chemical sDecies or liaht inDuts of varvina wavelenathsV but also on the relative order of the input application. (uhu.es)
  • Figure 1: Chemical mechanisms involved in photo-degradation of riboflavin and methionine (Fracassetti et al. (infowine.com)
  • With the new insight and tools we want to propose new photo-chemical applications. (su.se)
  • In the few steps of the process, there are very few equipments used like the chemical reagent, maskants, and etchants. (nationalvendingblog.com)
  • The benefits of chemical etching should be considered in the Design For Manufacturing process when choosing a manufacturing method for industrial components. (nationalvendingblog.com)
  • The elimination of mechanical tooling and its long lead time, the absence of surface burrs and deburring requirements, plus the speed with intricate designs makes photo chemical etching a fast manufacturing process for prototypes or large production. (nationalvendingblog.com)
  • This doctoral thesis contributes to these activities with the design and characterization of new molecular switches and model systems that can be used to study energy transfer processes. (uhu.es)
  • Electrochemical fabrication and characterization of thin films of redox-active molecular wires based on extended Rh-Rh bonded chains. (univ-grenoble-alpes.fr)
  • Synthesis and structural and physicochemical characterization of \[Rh2($μ$-OOCCH3)2(dmbpy)2][BF4]\}n molecular wire. (univ-grenoble-alpes.fr)
  • We are now investigating how the orientation of the reactant molecule influences the scattering process, as illustrated in Figure 1. (ox.ac.uk)
  • Her research interests include the advanced materials processing of ideal electrode materials for electrochemical energy storage system applications such as supercapacitor, water splitting process, direct methanol fuel cells, and hydrogen generation. (rsc.org)
  • X = Cl, Br, I). Electrochemical and photochemical properties and behavior. (univ-grenoble-alpes.fr)
  • To understand how photocatalysts effect sediment ecological microenvironment in the process of pollution remediation, the impact of typical photocatalyst g-C 3 N 4 (Graphitic carbon nitride) on rivered sediment community polluted by typical antibiotic tetracycline (TC) was investigated. (researchsquare.com)
  • Metastasis are characterized by a sequential and complex process during which cancer cells invade specific organs including lung, liver, brain, and bone [ 3 ] . (oaepublish.com)
  • In their study they resolve the initial events and find that a bright metal-to-ligand charge-transfer transition induces synchronous Fe-CO oscillations, followed by sequential transitions to dissociative metal-centered excited states. (nature.com)
  • This induces adaptations of their molecular geometry according to the properties of the excited state. (uni-potsdam.de)
  • Simulation strategies for non-linear X-ray spectra and diffraction schemes are applied to molecular system of increasing complexity. (su.se)
  • This provides detailed information about the steric requirements for particular scattering processes and can be used to control the outcome of molecular collisions. (ox.ac.uk)
  • Among the two families of upconverting gels reported, those display TTA-UC based on molecular diffusion show performances comparable to those in solutions, and the TTA-UC therein are affected by dissolved molecular oxygen. (mdpi.com)
  • The unique feature of the air-stable upconverting gels is that the self-assembled nanostructures are protected from molecular oxygen dissolved in the microscopically interconnected solution phase. (mdpi.com)
  • Oxygen atom functionalization has played an indispensable role in industrial applications and biological processes. (rsc.org)
  • A new surface-bound molecular switch based on the photochromic dimethyldihydropyrene with light-driven release of singlet oxygen properties. (univ-grenoble-alpes.fr)
  • Using these signatures of RIXS transitions into electronically excited states, we investigate proton dynamics induced by N K-edge excitation in the amino-acid histidine. (uni-potsdam.de)
  • ii) response to light and ii) electron transfer processes in a variety of organisms are subjects of great importance. (rsc.org)
  • Photoinduced energy and electron transfer processes in heteropolynuclear polypyridyl complexes of Ru(II) and Fe(II). (univ-grenoble-alpes.fr)
  • Although true multielectron charge transfer processes do not exist within the realm of molecular photochemistry, one can design mimicking systems via the production of a reactive one-electron charge transfer intermediate. (princeton.edu)
  • These transitions are usually summarized in a state energy diagram or Jablonski diagram, the paradigm of molecular photochemistry. (nationalvendingblog.com)
  • Structural transformations in crystals induced by radiation and pressure. (google.pl)
  • We covered topics going from the photochemical mechanisms involved, the different cell death mechanisms being triggered by a myriad of photosensitizers up to the more recent-on-going clinical trials. (oaepublish.com)
  • An host-guest complex between the cucurbit[7]uril organic macrocycle and a pH-dependent fluorescent naphthalimide-benzimidazole guest were used to demonstrate the macrocycle-induced control of photoinduced electron transfer of the guest. (uhu.es)
  • The photo-degradation of organic acids , i.e. tartaric acid, catalysed by iron, produces glyoxylic acid and the following browning as a consequence of xanthylium ion formation (Grant-Preece et al. (infowine.com)
  • Organic solvent-induced proximal tubular cell toxicity via caspase-3 activation. (cdc.gov)
  • The device, made by a team from the University of Cambridge, combines tiny semiconductor nanocrystals called quantum dots and gold nanoparticles using molecular glue called cucurbituril (CB). (techthoroughfare.com)
  • Scherman and his partners at the Cavendish Laboratory and University College London, Cambridge, have created a new technique of cucurbituril, a molecular glue that is extremely active with both gold nanoparticles and semiconductor quantum dots. (techthoroughfare.com)
  • The presence of the bicontinuous structures formed by the upconverting fibrous nanoassemblies and the solution phase is utilized to design photochemical reaction systems induced by TTA-UC. (mdpi.com)
  • In self-limiting processes, nature regulates the assembling of complex structures on the molecular scale. (techthoroughfare.com)
  • What Are Local Structures and Micro Molecular Environments in Ionic Liquids? (hamalab.com)
  • However, we demonstrate that the measured motions are not part of the photoisomerization reaction but instead arise from impulsively driven coherent vibrational processes in the electronic ground state. (nature.com)
  • A coherent-control experiment using a two-colour and two-pulse optical excitation strongly amplifies the X-ray crystallographic difference density, while it fully depletes the photoisomerization process. (nature.com)
  • The photoisomerization motion is therefore not directly captured in a pump-probe time series, which measures concentration changes instead if the process is incoherent. (nature.com)
  • We use femtosecond laser pump-probe techniques to provide real-time information about the dynamics of molecular photoisomerization and photodissociation - sometimes referred to as a molecular movie. (ox.ac.uk)
  • We utilize them to identify photo-induced N deprotonation of 2-thiopyridone on femtosecond timescales, in optical pump N K-edge RIXS probe measurements. (uni-potsdam.de)
  • The rapid reaction of protons to 1s photo-excitations can yield directional structural distortions within the femtosecond core-excited state lifetime. (uni-potsdam.de)
  • The structural dynamics that result from femtosecond optical excitation have contributions from vibrational and electronic processes and from reaction dynamics that involve the crossing through a conical intersection. (nature.com)
  • Furthermore, the photo-switching behavior of selected complexes containing azopyridine ligands was investigated. (materials-chain.com)
  • In the past, in the absence of quantum dots, when gold nanoparticles were combined with molecular glue, elements were aggregated without restriction and fell out of a solution. (techthoroughfare.com)
  • Some of the mentioned photochromic switches rely on energy transfer as excited state process. (uhu.es)
  • The unceasing impact of intense sunlight on earth constitutes a continuous source of energy fueling countless natural processes. (uni-potsdam.de)
  • Based on that, we analytically derive the possibility to extract one-dimensional directional cuts through potential energy surfaces of molecular systems from the corresponding RIXS spectra. (uni-potsdam.de)
  • There is a constant interest of using energy transfer as design principle for molecular dyads with the most diverse functions. (uhu.es)
  • The various aspects of erbium glass laser characteristics were carefully examined, including the influences of pumping pulsewidth, dopant concentration, output wavelength, relaxation oscillation and energy transfer processing between Yb 3+ and Er 3+ . (spie.org)
  • When RF is exposed to light, it reaches a high energy state and two photo-degradative mechanisms can take place. (infowine.com)
  • Research in my group focusses on three related areas: i) molecular reaction dynamics, ii) femtochemistry, and ii) imaging mass spectrometry. (ox.ac.uk)
  • In this process, numerous complex processes take place in the chloroplast, including the xanthophyll cycle, which involves the conversion of violaxanthin to zeaxanthin by the enzyme violaxanthin de-epoxidase (VDE) and the protonation of the photosystem II protein subunit PsbS. (iapn.de)
  • To detect these excited-state proton dynamics at the affected atoms, a local probe of molecular electronic structure is required. (uni-potsdam.de)
  • This GRC will be held in conjunction with the "Molecular Interactions and Dynamics" Gordon Research Seminar (GRS). (grc.org)
  • In sharp contrast, however, information on electronic processes in biomolecules such as isolated proteins and DNA (and their complexes) is still in its infancy. (rsc.org)
  • Photoinduced inter-protein electron transfer is also responsible for various biological processes. (rsc.org)
  • The underlying effect is the formation of so called "dressed states", which are created when the quantized radiation field mode couples to a molecular electronic transition. (su.se)
  • Malign consequences of mis-function in higher life forms can include blindness (retinal pigmentosa), as well as photomutation leading, in DNA, to the primary cause of various types of cancer which (when light induced) can lead to melanomas. (rsc.org)
  • The light-induced cross-linking of collagenous matrices in the presence of RB has yielded promising results in laboratory and clinical trials in terms of wound closure, reduced inflammation and less scaring. (aiche.org)
  • In the resulting coupled light-matter system the molecular and the photonic degrees of freedom are heavily mixed. (su.se)
  • One-Step vs Stepwise Immobilization of 1-D Coordination-Based Rh-Rh Molecular Wires on Gold Surfaces. (univ-grenoble-alpes.fr)
  • The photodissociation of transition metal carbonyls is involved in catalysis and synthetic processes. (nature.com)
  • Evaluation of the scavenging capacity in plants is achieved by in vitro analysis of the enzyme activities by photospectrometry, and transcript abundance of the respective gene by molecular methods. (iapn.de)
  • We show that highly oriented ground state vibrational modes of coupled nuclear motion can be populated through RIXS processes by preparation of core-excited state nuclear wave packets with the same directionality. (uni-potsdam.de)
  • The measured velocity distributions of the scattered products provide very detailed insight into the nuclear motion during the molecular collision. (ox.ac.uk)
  • As they absorb sun photons, it is fundamental to understand their photochemical properties. (uibk.ac.at)
  • Such directional structural deformations, induced by core-excitations, also make proton dynamics in electronic ground states accessible through RIXS transitions into vibrationally excited states. (uni-potsdam.de)
  • Though extremely complicated to uncover, knowledge of photo-excited state processes of such biomolecules in the cellular/biological context is the eventual goal of scientists working in these areas. (rsc.org)
  • The oxidation of this amino acid leads to methional that is unstable and photo-reactive and, through the retro-Michael reaction, generates methanethiol (MeSH) and acrolein. (infowine.com)
  • The results indicated that the relaxation processes shift the Curie temperature of amorphous phase to the higher temperatures. (sharif.edu)
  • Kinetic steady-state analysis showed that dimeric species are not as effective as monomeric RB for the photochemical ROS-mediated therapy. (aiche.org)
  • Photoinduced Rearrangement of Aromatic N-Chloroamides to Chloroaromatic Amides in the Solid State. (nyu.edu)
  • As an additional advantage the logic functions can be reset and reconfigured, which makes the system a versatile platform for molecular information processing. (uhu.es)
  • the gas phase using molecular beam scattering techniques. (ox.ac.uk)