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Differential ecophysiological responses and resilience to heat wave events in four co-occurring temperate tree species

Anirban Guha, Jimei Han, Cadan Cummings, David A McLennan, Jeffrey M Warren
2018 Environmental Research Letters  
Acknowledgments This research was supported by the US Department of Energy, Office of Science, Office of Biological and Environmental Research, and by the Laboratory Directed Research and Development Program  ...  of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy under contract DEAC05-00OR22725.  ...  Figure 5 . 5 Diurnal variations in (a) photochemical yield of photosystem-II ( PSII MP ), (b) electron transport rates (ETR MP ), (c) non-photochemical quenching (NPQ MP ) and (d) photochemical quenching  ... 
doi:10.1088/1748-9326/aabcd8 fatcat:d2hdgoyv25ae5o6s6ydwrs6c7q

Photochemical Reactivity of Naphthol-Naphthalimide Conjugates and Their Biological Activity

Matija Sambol, Patricia Benčić, Antonija Erben, Marija Matković, Branka Mihaljević, Ivo Piantanida, Marijeta Kralj, Nikola Basarić
2021 Molecules  
Their photophysical properties and photochemical reactivity were investigated and connected with biological activity.  ...  The irradiation of the complex 1e@BSA resulted in the alkylation of the protein, probably via QM.  ...  Synthetic procedures for the preparation of known precursors, fluorescence spectra, LFP data and non-covalent binding to ct-DNA and BSA, as well as copies of 1 H and 13 C NMR spectra.  ... 
doi:10.3390/molecules26113355 pmid:34199541 pmcid:PMC8199699 fatcat:vkslbq3juzfkhhkwxwv4ntwkwq

Accessibility of oxygen with respect to the heme pocket in horseradish peroxidase

Mazdak Khajehpour, Ivo Rietveld, Sergei Vinogradov, Ninad V. Prabhu, Kim A. Sharp, Jane M. Vanderkooi
2003 Proteins: Structure, Function, and Bioinformatics  
Oxygen readily quenches the phosphorescence of Pd porphyrins, and this can be used to characterize oxygen diffusion through the protein matrix.  ...  We demonstrate that the model of a "fluctuating entry point," as suggested by Zwanzig (J Chem Phys 1992;97:3587-3589), properly describes the diffusion of oxygen through the protein matrix.  ...  ACKNOWLEDGMENTS We acknowledge informative discussions and a generous gift of BNS by Professor M.D. Schuh of Davidson College.  ... 
doi:10.1002/prot.10475 pmid:14579357 fatcat:kmoqnr526bdu3oqjcynmktivja

Arctic Micromonas uses protein pools and non-photochemical quenching to cope with temperature restrictions on Photosystem II protein turnover

Guangyan Ni, Gabrielle Zimbalatti, Cole D. Murphy, Audrey B. Barnett, Christopher M. Arsenault, Gang Li, Amanda M. Cockshutt, Douglas A. Campbell
2016 Photosynthesis Research  
content, and their induction and relaxation of non-photochemical quenching.  ...  This non-photochemical quenching, however, relaxes during subsequent darkness with kinetics nearly comparable to the temperate Micromonas NCMA 1646, thereby limiting the opportunity cost of sustained downregulation  ...  Cockshutt did the integration to generate the formula for estimation of k recinact . Authors' contributions All authors contributed to drafts of the manuscript.  ... 
doi:10.1007/s11120-016-0310-6 pmid:27639727 pmcid:PMC5247552 fatcat:xnvoxgeakjggxk4isdhlegxdsi

Photochemistry and Spectral Characterization of Temperate and Gas-Rich Exoplanets [article]

Renyu Hu
2021 arXiv   pre-print
A common phenomenon on temperate planets is that the photodissociation of NH3 in presence of CH4 results in HCN as the main photochemical product.  ...  , and NH3, the photochemical gas HCN, as well as CO2 in some cases.  ...  This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.  ... 
arXiv:2108.04419v1 fatcat:7kbueoqeirbz3mcpxlef7c4zku

Photochemistry and structure in nucleic acids

A. A. Lamola
1973 Pure and Applied Chemistry  
Contrariwise, the use of photochemical yields in an empirical way to indicate occurrence of conformational changes has been successful.  ...  Research into the photochcmistry of biopolymcrs has increased in scope and scale to such an extent in recent years that it has become necessary to limit this review to a consideration of photochemical  ...  The decay of the singlet exciplexes at 80°K is predominantly non-radiative 284 as is observed for the isolated monomers.  ... 
doi:10.1351/pac197334020281 pmid:4574937 fatcat:3njilz44tfhwvo5ghhjhsa5foa

Re(bpy)(CO)3CN as a Probe of Conformational Flexibility in a Photochemical Ribonucleotide Reductase

Steven Y. Reece, Daniel A. Lutterman, Mohammad R. Seyedsayamdost, JoAnne Stubbe, Daniel G. Nocera
2009 Biochemistry  
Photochemical ribonucleotide reductases (photoRNRs) have been developed to study the protoncoupled electron transfer (PCET) mechanism of radical transport in class I E. coli ribonucleotide reductase (RNR  ...  The current model for RNR activity suggests that radical transport is strongly controlled by conformational gating.  ...  Chauhan for his assistance with the MP-FRaP experiments.  ... 
doi:10.1021/bi9005804 pmid:19402704 pmcid:PMC3340421 fatcat:uxo5mssdbbftfj6qaim2yfsare

Intramolecular Photoinduced Electron Transfer in Zwitterionic Quinolinium Dyes – Experimental and Theoretical Studies

T. Engel, G. Käb, H. Lanig
2002 Zeitschrift fur physikalische Chemie (Munchen. 1991)  
This suggests an intramolecular interaction of the anionic headgroups with the quinolinium system in the excited state.  ...  electron transfer may serve as a theoretical basis for a natural interpretation of the dynamic fluorescence quenching behavior.  ...  into the photoinduced electronic/nuclear dynamics and intermediates of these interesting quasi-supramolecular photochemical model systems.  ... 
doi:10.1524/zpch.2002.216.3.305 fatcat:dmoo5ws7pbhknfrk6atdrej2eq

More than two pyrrole tautomers of mesoporphyrin stabilized by a protein. High resolution optical spectroscopic study

J. Fidy, J.M. Vanderkooi, J. Zollfrank, J. Friedrich
1992 Biophysical Journal  
The experiment directly yields the distributions on a relative temperature scale, and a model is presented to transform the barrier heights into energy values.  ...  The energy separation of the origins of the tautomers is 100 cm1.  ...  The authors thank the Deutsche Forschungsgemeinschaft (grants Fr456/12-1 and SFB262-D12), the United States National Science Foundation (grant DM 88-15723) and the Semmelweis University of Medicine, Budapest  ... 
doi:10.1016/s0006-3495(92)81844-1 pmid:1547326 pmcid:PMC1260254 fatcat:ntekmtolv5ccvbuawspnrpmvyi

Fast Coordination Changes in CytochromecDo Not Necessarily Imply Folding

Alessandro Arcovito, Stefano Gianni, Maurizio Brunori, Carlo Travaglini-Allocatelli, Andrea Bellelli
2001 Journal of Biological Chemistry  
expected to trigger at least an incomplete refolding.  ...  Rapid photochemical methods have been employed to study the rate of folding of reduced cytochrome c. In this protein, the iron of the covalently bound heme binds a His and a Met, proximal and distal.  ...  equipped with either an amplifier Comlinear Corporation Model E203 or the preamplifier Tektronix ADA400.  ... 
doi:10.1074/jbc.m105183200 pmid:11487579 fatcat:zvhgjcr7lbeylbsopfxsqpbgwm

Non-Negligible Effects of UV Irradiation on Transformation and Environmental Risks of Microplastics in the Water Environment

Fangyuan Cheng, Tingting Zhang, Yue Liu, Yanan Zhang, Jiao Qu
2021 Journal of Xenobiotics  
Photoaging of MPs is an important process affecting the migration, transformation and interaction of pollutants in water and soil.  ...  In this review, the generation of MPs under UV irradiation and the influence of environmental factors on the photoaging of MPs were discussed.  ...  of MPs toward pollutants [77] .  ... 
doi:10.3390/jox12010001 pmid:35076549 pmcid:PMC8788448 fatcat:pxilr227pveile7v3y7rwxacxq

Mutations of Cytochrome b559 and PsbJ on and near the QC Site in Photosystem II Influence the Regulation of Short-Term Light Response and Photosynthetic Growth of the Cyanobacterium Synechocystis sp. PCC 6803

Jine-Yung Huang, Yi-Fang Chiu, José M. Ortega, Hsing-Ting Wang, Tien-Sheng Tseng, Shyue-Chu Ke, Mercedes Roncel, Hsiu-An Chu
2016 Biochemistry  
Strong blue-light conditions induced a quenching of fluorescence corresponding to non-photochemical fluorescence quenching (NPQ).  ...  When similar measures were repeated on an orange carotenoid protein (OCP)-deficient background, little or no quenching was observed, which confirms that the decrease in fluorescence under strong blue light  ...  B. (2013) Evolution of flexible non-photochemical quenching mechanisms that regulate light harvesting in oxygenic photosynthesis, Curr. Opin.  ... 
doi:10.1021/acs.biochem.6b00133 pmid:27026225 fatcat:rwwj27kbrzbqfportubpbqgiqe

Transport and Retinal Capture of Lutein and Zeaxanthin with Reference to Age-related Macular Degeneration

Edward Loane, John M. Nolan, Orla O'Donovan, Prakash Bhosale, Paul S. Bernstein, Stephen Beatty
2008 Survey of ophthalmology  
blue light at a pre-receptoral level, or by quenching free radicals.  ...  of dietary origin. 17 The concentration of MP peaks at the center of the macula, known as the fovea, where zeaxanthin is the dominant carotenoid.  ...  . 49, 96 Recently, Reboul et al examined the transport of lutein using Caco-2 TC-7 monolayers as an in vitro model for human intestinal epithelium, in an attempt to characterize the transport of lutein  ... 
doi:10.1016/j.survophthal.2007.10.008 pmid:18191658 fatcat:f3qlb7mqkrfp5ek7uhckrnfiwm

Novel fluorescent silver nanoparticles: sensitive and selective turn off sensor for cadmium ions

Bharat A. Makwana, Disha J. Vyas, Keyur D. Bhatt, Savan Darji, Vinod K. Jain
2015 Applied Nanoscience  
The synthesis of metal nanoparticles by ecofriendly and reliable processes is an important aspect in many fields.  ...  Using OMRTH-AgNps as a selective and sensitive fluorescent probe, cadmium can be detected at a minimum concentration level of 10 -8 M in a facile way of fluorescence quenching, i.e., by a "turn off" mechanism  ...  We are also thankful to the Department of Microbiology (Gujarat University) for help in antimicrobial studies.  ... 
doi:10.1007/s13204-015-0459-x fatcat:d7lncd52arbnzg5h6nzabzagze

Application of PET deprotection for orthogonal photocontrol of aqueous solution viscosity

J. Brian Borak, Hee-Young Lee, Srinivasa R. Raghavan, Daniel E. Falvey
2010 Chemical Communications  
Scheme 2 Deprotection of NAP-tCA by mediated electron transfer.  ...  Photorelease and photoisomerization of trans-cinnamic acid in aqueous CTAB solutions induces a bulk solution viscosity increase and decrease, respectively, triggered by orthogonal irradiation wavelengths  ...  Traces were fit to a model function containing exponential growth and decay terms with an added baselinecorrection term.  ... 
doi:10.1039/c0cc02203a pmid:20967368 fatcat:l5542x6nbbettoupuwelpxxbgq
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