• The xanthophyll cycle (XC) dependent non-photochemical chlorophyll fluorescence quenching (NPQ) is one of the most important photoprotective processes that rapidly regulate photosynthesis in diatoms. (uni-konstanz.de)
  • Transcriptomic analyses revealed that symbionts from corals under lower pH treatments responded to acidification by increasing the expression of genes related to photosynthesis and carbon-concentrating mechanisms. (edu.sa)
  • These processes were mostly up-regulated and associated metabolic pathways were significantly enriched, suggesting an overall positive effect of OA on the expression of photosynthesis-related genes. (edu.sa)
  • These include the potential use of infrared thermal imaging to study energy balance, integrated and online stable isotope analysis to dissect processes involved in carbon dioxide fixation and water evaporation, and leaf fluorescence to monitor photosynthesis and photochemical quenching. (elsevierpure.com)
  • New data concerning the structure and photochemical reactivity of strong Fe(III) binding ligands (siderophores) produced by pelagic marine bacteria suggest that direct photolysis via ligand-to-metal charge transfer reactions may be an important mechanism for the production of reduced, biologically available iron (Fe[II]) in surface waters. (bioone.org)
  • These particles display different surface charges and hydration structures on different crystalline facet, which lead to different chemical, photochemical, and electrochemical reactivity. (utwente.nl)
  • Under these conditions it is localized mostly in cell membranes, which may affect its photochemical reactivity. (gladstone.org)
  • Structure-reactivity mechanisms of organic matter sorption and photochemical transformation in aqueous environments. (tdl.org)
  • The original research in this dissertation is aimed towards better understanding structure-reactivity mechanisms that control organic matter sorption to metal oxides and its photodegradation in aquatic environments. (tdl.org)
  • This last mechanism, which is multifactorial, is known as the non-photochemical quenching of chlorophyll fluorescence . (cea.fr)
  • B) The use of photochemical reagents to carry out site-specific reactions on DNA, in particular those involving photo-induced electron transfer. (tcd.ie)
  • This reactive species of oxygen causes what's called photochemical transformation, a process in which light and oxidizing materials produce chemical reactions. (newswise.com)
  • And because the process does not occur in the dark, the amount of sunlight a water body receives also affects reactions. (newswise.com)
  • About 10 years ago, chemists discovered a novel reaction mechanism in dissociation reactions of gas-phase molecules, called roaming. (sciencedaily.com)
  • In this study, a movie for observing the structural changes in solute and solvent molecules was obtained, contributing to the understanding of the mechanisms behind solvation effects in photochemical reactions. (or.jp)
  • Mechanisms of electron-transfer reactions are fully investigated using femtosecond and nanosecond transient absorption spectroscopy. (ewha.ac.kr)
  • In recent years, progress has been made toward understanding the role of biologically produced organic ligands in controlling the speciation and photochemical redox cycling of iron in ocean surface waters. (bioone.org)
  • Porphyrin-based photosynthetic reaction centre (PRC) mimics, ZnPQ-Q2HP-C 60 and MP 2 Q-Q2HP-C 60 (M = Zn or 2H), designed to have a similar special-pair electron donor and similar charge-separation distances, redox processes and photochemical reaction rates to those in the natural PRC from purple bacteria, have been synthesised and extensive photochemical studies performed. (ewha.ac.kr)
  • The photoprotective NPQ (non-photochemical fluorescence quenching) process allows the plastid to safely dissipate the excess energy absorbed during a light stress. (uni-konstanz.de)
  • To protect themselves from photooxidative damage in a fluctuating light climate potentially punctuated with regular excess light exposures, diatoms have developed several photoprotective mechanisms. (uni-konstanz.de)
  • Consistent with this finding, the photosynthetic response to variable intercellular CO 2 concentrations (A/C i curves) revealed no permanent damage to the photosynthetic apparatus and implicated developed photoprotective mechanisms. (iucc.ac.il)
  • In the present study, kinetics of degradation of EDTA (20,000 mg/l) by employing either Photo-Fenton process using UV (15 W λ max = 253.7 nm) or Sono-Fenton process using ultrasound at 130 KHz or simultaneous Sono-Photo Fenton process has been investigated. (scirp.org)
  • Formation of amides was con - firmed during the degradation processes. (scirp.org)
  • A possible degradation mechanism is proposed to interpret the kinetic findings. (uca.es)
  • Figure 1: Chemical mechanisms involved in photo-degradation of riboflavin and methionine (Fracassetti et al. (infowine.com)
  • 10] C. Galindo, P. Jaques and A. Kalt: "Photochemical and photocatalytic degradation of an indigoid dye: a case study of acid blue 74 (AB74)", Journal of Photochemistry and Photobiology A: Chemistry, Vol. 141, (2001), pp. 47-56. (edu.pl)
  • 12] N.H. Ince: "Critical effect of hydrogen peroxide in photochemical dye degradation", Water Research, Vol. 33, (1999), pp. 1080-1084. (edu.pl)
  • This review summarizes recent progress on photocatalytic degradation of air pollutants and categorizes them based on the types of photocatalytic materials and air pollutants, with a focus on photocatalytic reaction mechanisms and the application scenarios of photocatalytic air purification to identify this gap. (nso-journal.org)
  • He has a lot of experience in the field of sol-gel processing and photocatalytic degradation organic materials from industrial wastewaters. (degruyter.com)
  • Donkers RL, Workentin MS. ( 2004 ) Elucidation of the electron transfer reduction mechanism of anthracene endoperoxides. (academictree.org)
  • Magri DC, Donkers RL, Workentin MS. ( 2001 ) Kinetics of the photoinduced dissociative electron transfer reduction of the antimalarial endoperoxide, Artemisinin Journal of Photochemistry and Photobiology a: Chemistry . (academictree.org)
  • In these systems, MV ·+ accumulated and remained even in air-saturated solution for more than 1 h, because electron transfer from O 2 ·- to MV 2+ is an exothermic process in aprotic solvents. (elsevierpure.com)
  • The electron-transfer mechanism and recent developments that should lead to the practical application of the organic radical battery are also described. (go.jp)
  • We have identified the hydrogenation of the bridging ligand, which inhibits the light-driven electron transfer between the photocentre and catalytic centre, as the deactivation mechanism. (nature.com)
  • Merocyanine undergoes photodegradation, a solvent-dependent process that proceeds faster when the dye is aggregated. (gladstone.org)
  • M. Sorensen and F. H. Frimmel, "Photodegradation of EDTA and NTA in the UV/H2O2 Process," Zeitschrift für Naturforschung, Vol. 50, No. 12, 1995, pp. 1845-1853. (scirp.org)
  • The direct photodegradation of 2,4,6-trichlorophenol (TCP) by UV-vis light was studied in aqueous solution in order to analyze the mechanism of the photochemical process and to determine the kinetic parameters including the quantum yield. (uca.es)
  • In organic chemistry, the di-π-methane rearrangement is the photochemical rearrangement of a molecule that contains two π-systems separated by a saturated carbon atom. (wikipedia.org)
  • The BGSU team showed that following ultraviolet excitation of geminal tribromides, including bromoform, what looks like simple fission of a carbon-bromine bond at first look is in fact isomerization (the process by which one molecule is transformed into another molecule with exactly the same atoms but in a different arrangement, and with different chemical properties) at fairly large distances via roaming of the molecular fragments. (sciencedaily.com)
  • A flat molecule containing nitrogen is turned into a three-dimensional molecule through photochemical synthesis (illustration). (uni-muenster.de)
  • It's important to develop new and more efficient small molecule and polymer materials which could be used in high vacuum thermal evaporation or solution processing. (rsc.org)
  • Silencing of the violaxanthin de-epoxidase gene in the diatom Phaeodactylum tricornutum reduces diatoxanthin synthesis and non-photochemical quenching PLoS ONE. (uni-konstanz.de)
  • The synergistic combination of the spectral and intensity features of solar energy can potentially lead to chemical synthesis processes under milder temperature conditions than those in solar thermochemical processes. (psu.edu)
  • A direct solar receiver-reactor is built and used for the catalytic photo-thermochemical processing of carbon dioxide. (psu.edu)
  • Solar photo-thermochemical processing of CO 2 using an optically and catalytically tuned catalytic monolith can lead to higher decomposition yields than photochemical processes, potentially comparable to those of solar thermochemical approaches while operating at lower temperatures. (psu.edu)
  • Another special feature of the study: the scientists clarified the reaction mechanism and the exact structure of the molecules produced for the first time not only analytically and experimentally in detail, but also via 'computational chemistry': Kendall Houk and Shuming Chen conducted detailed computer-aided modeling of the reaction. (uni-muenster.de)
  • However, the photocatalysis technology suffers from the unrevealed reaction mechanism and the deactivation of photocatalysts, which severely limits its practical application. (nso-journal.org)
  • A detailed gas-phase chemistry mechanism is combined with dust surface uptake processes to explore possible impacts of mineral dust on tropospheric chemistry. (ametsoc.org)
  • The magnitude of the dust effect strongly depends on the preexisting dust surfaces, the initial conditions, and the selection of model parameters associated with surface uptake processes. (ametsoc.org)
  • The interaction of copper sulfate and sunlight in seawater suggests a new mechanism for methyl halide production, most likely via a photochemical reaction or through suppression of normal uptake processes causing overabundant concentrations. (escholarship.org)
  • He was the senior author of a 2020 article in Photochemical and Photobiological Sciences that summarized the potential benefits of PLE in preventing damage related to sun exposure. (medscape.com)
  • All the above mentioned processes were found to follow a first order kinetics reaction. (scirp.org)
  • The photochemical growth process of silver decahedra was monitored by both extinction and scattering spectral evolution. (ojp.gov)
  • Merocyanine 540 solubilized as an ion pair with cationic surfactant in nonpolar solvents: spectral and photochemical properties. (gladstone.org)
  • Aggregation strongly affects the spectral and photochemical properties of MC, especially in aliphatic hydrocarbons in which distinctive H-type aggregates are formed. (gladstone.org)
  • Our data show the spectral and photochemical properties of MC in a pure hydrophobic environment. (gladstone.org)
  • From the observed pH changes during the oxidation processes, it can be concluded that there is a loss of chelating ability of EDTA. (scirp.org)
  • 1] R. Andreozzi, V. Caprio, A. Insola and R. Marotta: "Advanced oxidation processes (AOP) for water purification and recovery", Catalysis Today, Vol. 53, (1999), pp. 51-59. (edu.pl)
  • 3] N. Azbar, T. Yonar and K. Kestioglu: "Comparison of various advanced oxidation processes and chemical treatment methods for COD and color removal from a polyester and acetate fiber dyeing effluent", Chemosphere, Vol. 55, (2004), pp. 35-43. (edu.pl)
  • The mechanism of superoxide-mediated reduction of Fe(III) in the presence of strong Fe(III) organic ligands is also open to debate. (bioone.org)
  • Good agreement with the observed CO mixing ratio can be achieved via this mechanism, but the resulting ozone column is much higher than the observed quantity. (caltech.edu)
  • Most emitted air pollution can lead to the formation of secondary pollutants (e.g., tropospheric ozone, peroxyacetyl nitrate), secondary organic aerosols, and photochemical smog [ 6 , 7 ], which is the major cause of a sharp decrease in air quality in numerous regions around the world [ 8 - 10 ]. (nso-journal.org)
  • The potential mechanisms linking the records are either denitrification or increased boundary layer photochemical ozone production. (hal.science)
  • To test this conclusion on a physiological level, we analyzed the symbiont's photochemical performance across treatments. (edu.sa)
  • Mechanisms that trigger leaf drop is a process which includes physiological and chemical pathways happening within the plants. (wikipedia.org)
  • What is the actual physiological mechanism? (cdc.gov)
  • The association of organic carbon with metal oxides and its photochemical transformation are critical factors controlling C turnover in soils and aquatic systems. (tdl.org)
  • EDTA is effectively degraded by the synergistic effect of both Photo Fenton and Sono Fenton process. (scirp.org)
  • A significant, but moderate acceleration of the reaction rate with increasing temperature was revealed between 5.0 and 35.0 C, which could be interpreted readily by assuming that the excited state of TCP is involved in two competing processes. (uca.es)
  • Drought deciduous species, depending on the region it is situated, would undergo abscission not necessarily due to cold weather, they may undergo this process due to shortage of water which may be limited due to relatively low rainfall and summers with a relatively higher temperature or unexpected prolonged season. (wikipedia.org)
  • The degree of severity of summertime photochemical episodes largely depends on daytime air temperature, and high summertime air pollution events are almost always associated with anticyclonic conditions and temperatures in excess of 28-30 1C (UK PORG, 1997). (typeset.io)
  • 2000 ) 9 Reaction mechanisms Annual Reports Section "B" (Organic Chemistry) . (academictree.org)
  • A photochemical sciences research team has shown that a new and unusual reaction path in chemistry occurs not only in the gas phase, but also in solution. (sciencedaily.com)
  • Tarnovsky and doctoral graduate assistants Andrey Mereschenko, Evgeniia V. Butaeva, Veniamin Borin and Anna Eyzips are the listed authors of a Nature Chemistry journal article about the finding. (sciencedaily.com)
  • Dissociation, the process of breaking a chemical bond, lies at the heart of chemistry," Tarnovsky said. (sciencedaily.com)
  • The review process for all submissions for this Virtual Special Issue will be handled by The Journal of Physical Chemistry C's Senior Editors Stephan Link and Gregory Hartland. (acs.org)
  • You can find a complete list of sections and other important information for authors in The Journal of Physical Chemistry C's Author Guidelines . (acs.org)
  • As with all submissions to The Journal of Physical Chemistry C , your manuscript should represent a rigorous scientific report of original research, as it will be peer-reviewed as a regular article. (acs.org)
  • If you are unsure if your research is within the Virtual Special Issue's scope or have other questions about submitting a manuscript to this Virtual Special Issue, please email The Journal of Physical Chemistry C Deputy Editor Gregory Hartland's office at [email protected] . (acs.org)
  • A computational fluid dynamics (CFD) model, describing fluid flow, radiation transport, and heterogeneous photo- and thermo-chemistry, is used to analyze the CO 2 decomposition process in the 1 wt% tubular quartz reactor. (psu.edu)
  • Donkers RL, Stringle DLB, Workentin MS. ( 2001 ) 7 Reaction mechanisms. (academictree.org)
  • A method for the simultaneous (one-step) photochemical conjugation and 89 Zr-radiolabeling of antibodies is introduced. (tau.ac.il)
  • Scientifically and technologically the c-COOL research program focuses on the fundamental microscopic characterization and understanding of the clay-CO 2 interaction, the loading and storage process, as well as subsequent processing and injection of suspensions into (model) porous media. (utwente.nl)
  • While numerous publications in high ranking journals celebrate the potential of this method the microscopic mechanisms underlying the process have remained rather elusive. (utwente.nl)
  • Specimens were processed for ultrastructural and light microscopic investigations. (who.int)
  • Singlet excited states do not rotate and may thus undergo the di-π-methane mechanism. (wikipedia.org)
  • Daisuke Minakata, associate professor of civil, environmental and geospatial engineering at Michigan Tech, developed a comprehensive reactive activity model that shows how singlet oxygen's reaction mechanisms perform against a diverse group of contaminants and computes their half-life in a natural aquatic environment. (newswise.com)
  • The postulated heterogeneous mechanism provides a plausible interpretation for the observed high nitrate and sulfate on dust and the anticorrelation between O 3 and dust in East Asia. (ametsoc.org)
  • We feel that there is no need at this time to invoke heterogeneous processes to reconcile models and observations. (caltech.edu)
  • Independent of salinity treatment, 80% of the energy absorbed by the leaf was directed to non-photochemical quenching, as presented in electron-equivalent units. (iucc.ac.il)
  • 3] This possible role of bilirubin in early protection against oxidative injury, coupled with identification of multiple neonatal mechanisms to preserve and potentiate bilirubin production, has led to speculation about an as-yet-unrecognized beneficial role for bilirubin in the human neonate. (medscape.com)
  • Our findings suggest that fine PM enhances allergic inflammatory response in pulmonary tissue through mechanisms involving increased oxidative stress. (cdc.gov)
  • New insights into the cellular mechanisms of plant growth at elevated atmospheric carbon dioxide concentrations. (nature.com)
  • To an important extent, this is due to the fact that the efficiency of the energy conversion process depends strongly on the presence of charge on the surface. (utwente.nl)
  • To understand the full environmental impact of these compounds, it is important to identify their chemical cycling processes. (escholarship.org)
  • The results show that mineral dust may influence tropospheric sulfate, nitrate, and O 3 formation by affecting trace gas concentrations and the tropospheric oxidation capacity through surface processes. (ametsoc.org)
  • Also, this study is a sequel to the group's study published in the scientific journal Nature Communications in 2019. (or.jp)
  • In addition, the replacement, cleaning, and disposal of adsorbent materials are costly processes and may cause secondary pollution. (nso-journal.org)
  • from the macroscopic scale, through the movement of its leaves, to the molecular scale , through a mechanism that allows the dissipation of energy as heat . (cea.fr)
  • The primary photochemical process is a trans- to -cis isomerization about the C 13 =C 14 bond of the retinal chromophore that has been directly observed using femtosecond dynamic absorption spectroscopy. (ias.ac.in)
  • comparing a pdf Equality and Power on Roe ion wind on simple hydrocarbons, we are the Design while quantizing to definitive advantage, potentially that system points show with instructions and new mechanisms. (taido-hannover.de)
  • This article reports on a project in which silver decahedra were successfully synthesized with high yield via a photochemical reaction using blue light-emitting diodes (LEDs) as the exciting light source. (ojp.gov)
  • The modeling results provide assessment of the photochemical and thermochemical effects, and suggest the synergistic enhancement due to the photolytic mechanism on the thermochemical process. (psu.edu)
  • A collaborative research group led by Tetsuo Katayama (research scientist) of the XFEL Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI), has succeeded in clarifying the atomic-scale mechanisms of photochemical processes in solution, where the solute molecules absorbing light and the surrounding solvent molecules influence each other. (or.jp)
  • In this process, two new bonds and a new ring are formed between the molecules. (uni-muenster.de)
  • In a study published in JBC, a team from I2BC/CEA-Joliot, in collaboration with the Beijing Botanical Institute (China), describes for the first time an intermediate state of the light-harvesting antenna of higher plants that provides a better understanding of the changes that take place at the molecular level during the activation of a plant's photoprotection mechanism. (cea.fr)
  • This state of LHCII should be considered as a n intermediate state that would allow the transition from an unquenched state, capable of absorbing and converting light energy into chemical energy, to a 'quenched' state through non-photochemical quenching . (cea.fr)
  • Xanthophyll pigmentns and specific light-harvesting complex (LHC) polypeptides are necessary for the NPQ mechanism. (uni-konstanz.de)
  • Especially, we want to gain knowledge on the LHC polypeptide(s) involved in the response of the cells to hight light, and to identify the special LHC antenna polypeptide(s) possibly involved iin the control of the NPQ process. (uni-konstanz.de)
  • Based on initial rate studies at different overall volumes and illumination patterns, it was proved that the rate of the process is directly proportional to the intensity of irradiating light. (uca.es)
  • When RF is exposed to light, it reaches a high energy state and two photo-degradative mechanisms can take place. (infowine.com)
  • The established lifetimes are long compared to other processes in organic solar cells or other organic light harvesting systems. (ewha.ac.kr)
  • To ensure an unbiased peer-review process, the journal asks that you do not indicate within your manuscript that the submission is intended for the Virtual Special Issue. (acs.org)
  • Contemporarily, a further comprehension of the chemical mechanisms behind the LST formation can support specific oenological treatments as well as clarify the reasons why certain white wines can be more susceptible than others (Mattivi et al. (infowine.com)
  • Dec. 2, 2022 The Kibble-Zurek (KZ) mechanism, confirmed experimentally only for equilibrium phase transitions, is also applicable for non-equilibrium phase transitions, as is now shown in a landmark study. (sciencedaily.com)
  • Resonance Raman and femtosecond dynamic absorption spectroscopy are being used to elucidate the molecular mechanism of bacteriorhodopsin. (ias.ac.in)
  • The photochemical reaction mechanisms were investigated by the transient-absorption method. (elsevierpure.com)
  • Higher photostability and better photosensitization by MC in hydrophobic nonpolar solvents suggest that the killing of leukemia cells via a photodynamic mechanism may operate mostly in cell membranes. (gladstone.org)
  • Recent advances in studying the physical and biochemical processes related to water use and drought stress offer the opportunity to advance a more holistic understanding of drought resistance. (elsevierpure.com)
  • Their research was published this summer in the journal Environmental Science and Technology. (newswise.com)
  • Editors select a small number of articles recently published in the journal that they believe will be particularly interesting to readers, or important in the respective research area. (mdpi.com)
  • The aim is to provide a snapshot of some of the most exciting work published in the various research areas of the journal. (mdpi.com)
  • Once the mechanism was recognized as general by Howard Zimmerman in 1967, it was clear that the structural requirement was two π groups attached to an sp3-hybridized carbon, and then a variety of further examples was obtained. (wikipedia.org)
  • This work was part-supported by the French Infrastructure for Integrated Structural Biology ( FRISBI ) and the "Infrastructures en Biologie Santé et Agronomie" ( IBiSA ). (cea.fr)
  • Plant biomass type and its processing via charring were significant drivers of dissolved organic matter (DOM) photolability and its sorption to nano-crystalline boehmite. (tdl.org)
  • The factors governing the amounts of CO, O_2, and O_3 in the martian atmosphere are investigated using a minimally constrained, one-dimensional photochemical model. (caltech.edu)
  • 9] A.M. El-Dein, J.A. Libra and U. Wiesmann: "Mechanism and kinetic model for the decolorization of the azo dye Reactive Black 5 by hydrogen peroxide and UV radiation" , Chemosphere, Vol. 52, (2003), pp. 1069-1077. (edu.pl)
  • In this paper, a Mesoscale Model (MM5), Sparse Matrix Operator Kernel Emissions (SMOKE) and Community Multiscale Air Quality (CMAQ) model has been applied to a summer photochemical period in southeast England, UK. (typeset.io)
  • Further investigation into the uncertainties in meteorological input, uncertainties in emissions, as well as representation of physical and chemical processes (e.g. chemical mechanism) in the model is needed to identify the causes for the discrepancies between observations and predictions. (typeset.io)