Results 31 to 40 of about 168,635 (283)
Synthesis, Characterization and Protonation Behavior of Quinoxaline-Fused Porphycenes
Molecules, 2017 9,10-Quinoxaline-fused porphycenes 1a-H2 and 1b-H2 were synthesized by intramolecular McMurry coupling. As a result of the annulation of the quinoxaline moiety on the porphycene skeleton, 1a-H2 and 1b-H2 display absorption and fluorescence in the near ...
Daiki Kuzuhara +5 more
doaj +1 more source
Theoretical study on the protonation of AZA-aromatics [PDF]
, 1975 The protonation of azanaphthalenes and azabenzenes has been studied theoretically using CNDO/2 wavefunctions and perturbation theory in order to examine the correlation between pKa values and quantum-mechanical ...
Meer, Douwe van der +1 more
core +2 more sources
Role of Thr82 for the unique photochemistry of TAT rhodopsin
Biophysics and Physicobiology, 2021 Marine bacterial TAT rhodopsin possesses the pKa of the retinal Schiff base, the chromophore, at neutral pH, and photoexcitation of the visible protonated state forms the isomerized 13-cis state, but reverts to the original state within 10–5 sec.
Teppei Sugimoto +2 more
doaj +1 more source
Europium(III) Macrocyclic Chelates Appended with Tyrosine-based Chromophores and Di-(2-picolyl)amine-based Receptors: Turn-On Luminescent Chemosensors Selective to Zinc(II) Ions [PDF]
, 2020 [Abstract] Zinc ions play an important role in many biological processes in the human body. To selectively detect Zn²⁺, two EuDO3A‐based complexes (DO3A=1,4,7,10‐tetraazacyclododecane‐1,4,7‐tricarboxylic acid) appended with tyrosine as a chromophore and ...
Angelovski, Goran +2 more
core +2 more sources
E-Journal of Chemistry, 2007 The protonation constants of diamines such as ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, o-phenylenediamine, m-phenylene-diamine, p-phenylenediamine were determined on the basis of Bjerrum and Calvin method in methanol-water mixtures.
Sangita Sharma +4 more
doaj +1 more source
Proton-air and proton-proton cross sections [PDF]
EPJ Web of Conferences, 2013 Different attempts to measure hadronic cross sections with cosmic ray data are reviewed. The major results are compared to each other and the differences in the corresponding analyses are discussed. Besides some important differences, it is crucial to see that all analyses are based on the same fundamental relation of longitudinal air shower ...
openaire +3 more sources
Electron transport through dipyrimidinyl-diphenyl diblock molecular wire: protonation effect
, 2006 Recently, rectifying direction inversion has been observed in dipyrimidinyl-diphenyl (PMPH) diblock molecular wire [J. Am. Chem. Soc. (2005) 127, 10456], and a protonation mechanism was suggested to explain this interesting phenomena.
A. Aviram +29 more
core +1 more source
A two-state model of twisted intramolecular chargetransfer in monomethine dyes [PDF]
, 2012 A two-state model Hamiltonian is proposed to model the coupling of twisting displacements to charge-transfer behavior in the ground and excited states of a general monomethine dye molecule.
McKenzie, Ross H., Olsen, Seth
core +1 more source
Strangeness production in proton—proton and proton—nucleus collisions [PDF]
Pramana, 2006 16 pages, 9 figures, Talk presented in the workshop on Hadron Physics, Puri, India, March 7-17 ...
openaire +2 more sources
Pediatric Blood &Cancer, EarlyView.ABSTRACT Pediatric gastroenteropancreatic neuroendocrine neoplasms (GEP‐NENs) are extremely rare and clinically heterogeneous. Management has largely been extrapolated from adult practice. This European Standard Clinical Practice Guideline (ESCP), developed by the EXPeRT network in collaboration with adult NEN experts, provides (adult) evidence ...
Michaela Kuhlen +23 more
wiley +1 more source