Red/Green Color Tuning of Visual Rhodopsins: Electrostatic Theory Provides a Quantitative Explanation

2018 ◽  
Vol 122 (18) ◽  
pp. 4828-4837 ◽  
Author(s):  
Florimond Collette ◽  
Thomas Renger ◽  
Frank Müh ◽  
Marcel Schmidt am Busch
Keyword(s):  
Color Tuning ◽  
Green Color ◽  
Quantitative Explanation ◽  
Electrostatic Theory

scholarly journals Color-tuning of natural variants of heliorhodopsin

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Se-Hwan Kim ◽  
Kimleng Chuon ◽  
Shin-Gyu Cho ◽  
Ahreum Choi ◽  
Seanghun Meas ◽  
...  
Keyword(s):  
3D Structure ◽  
Site Directed Mutagenesis ◽  
Type I ◽  
Transmembrane Helices ◽  
Color Tuning ◽  
Tuning Mechanism ◽  
Spectral Changes ◽  
His Tag ◽  
Natural Variants ◽  
Retinal Chromophore

AbstractMicrobial rhodopsins are distributed through many microorganisms. Heliorhodopsins are newly discovered but have an unclear function. They have seven transmembrane helices similar to type-I and type-II rhodopsins, but they are different in that the N-terminal region of heliorhodopsin is cytoplasmic. We chose 13 representative heliorhodopsins from various microorganisms, expressed and purified with an N-terminal His tag, and measured the absorption spectra. The 13 natural variants had an absorption maximum (λmax) in the range 530–556 nm similar to proteorhodopsin (λmax = 490–525 nm). We selected several candidate residues that influence rhodopsin color-tuning based on sequence alignment and constructed mutants via site-directed mutagenesis to confirm the spectral changes. We found two important residues located near retinal chromophore that influence λmax. We also predict the 3D structure via homology-modeling of Thermoplasmatales heliorhodopsin. The results indicate that the color-tuning mechanism of type-I rhodopsin can be applied to understand the color-tuning of heliorhodopsin.

Novel and Wide-Ranging Color Tuning Photoluminescence Properties of Tb3+/Eu3+ Doped Garnet-type Li3Lu3Te2O12 Phosphor: Energy Transfer and Enhanced Thermal Stability

2021 ◽  
pp. 159506
Author(s):  
Mingyang Qu ◽  
Xiyan Zhang ◽  
Xiaoyun Mi ◽  
Haiying Sun ◽  
Quansheng Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Energy Transfer ◽  
Photoluminescence Properties ◽  
Color Tuning

A New Classification of the Red-Green Color-Blind

1929 ◽  
Vol 41 (2) ◽  
pp. 237 ◽  
Author(s):  
Sibyl Walcutt Terman
Keyword(s):  
New Classification ◽  
Green Color ◽  
Color Blind

scholarly journals Unusual piezochromic fluorescence of a distyrylpyrazine derivative crystals: phase transition through [2 + 2] photocycloaddition under UV irradiation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Young-Jae Jin ◽  
Hyosang Park ◽  
Byung-Chun Moon ◽  
Jae Hong Kim ◽  
Wang-Eun Lee ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Uv Irradiation ◽  
Mechanical Grinding ◽  
Green Color ◽  
H Nmr ◽  
Uv Visible ◽  
Stacking Structure ◽  
Orange Color ◽  
Molecular Stacking

AbstractThe piezochromic fluorescence (FL) of a distyrylpyrazine derivative, 2,3-diisocyano-5,6-distyrylpyrazine (DSP), was investigated in this study. Depending on the recrystallization method, DSP afforded two different crystals with green and orange FL emission. The orange color FL emission crystal (O-form) was easily converted to the green color FL emission one (G-form) by manual grinding. The G-form was also converted to a slightly different orange color FL emission crystal (RO-form) by a weak UV irradiation. When the RO-form was ground again, the G-form was regenerated. The FL colors changed between the G- and RO-forms over several ten times by repeated mechanical grinding and UV irradiation. The FL, UV–visible, 1H-NMR and XRD results showed that the O (or RO)-to-G transformation induced by mechanical stress results from the change of degree of molecular stacking from dense molecular stacking structure to relatively loose molecular stacking structure, whereas the G-to-RO reconversion by UV irradiation results from return to dense molecular stacking structure again due to lattice movement (lattice slipping) allowed by photocycloaddition in solid-state.

Excitation‐Dependent Emission Color Tuning of 0D Cs 2 InBr 5 ·H 2 O at High Pressure

2021 ◽  
pp. 2104923
Author(s):  
Qian Li ◽  
Bin Xu ◽  
Zhongwei Chen ◽  
Jiang Han ◽  
Li Tan ◽  
...  
Keyword(s):  
High Pressure ◽  
Color Tuning ◽  
Emission Color

scholarly journals The Molecular Genetics and Evolution of Red and Green Color Vision in Vertebrates

Genetics ◽  
2001 ◽  
Vol 158 (4) ◽  
pp. 1697-1710 ◽  
Author(s):  
Shozo Yokoyama ◽  
F Bernhard Radlwimmer
Keyword(s):  
Color Vision ◽  
Homo Sapiens ◽  
Amino Acid Sequences ◽  
Capra Hircus ◽  
Sciurus Carolinensis ◽  
Cave Fish ◽  
Vitro Assay ◽  
Green Color ◽  
Astyanax Fasciatus

Abstract To better understand the evolution of red-green color vision in vertebrates, we inferred the amino acid sequences of the ancestral pigments of 11 selected visual pigments: the LWS pigments of cave fish (Astyanax fasciatus), frog (Xenopus laevis), chicken (Gallus gallus), chameleon (Anolis carolinensis), goat (Capra hircus), and human (Homo sapiens); and the MWS pigments of cave fish, gecko (Gekko gekko), mouse (Mus musculus), squirrel (Sciurus carolinensis), and human. We constructed these ancestral pigments by introducing the necessary mutations into contemporary pigments and evaluated their absorption spectra using an in vitro assay. The results show that the common ancestor of vertebrates and most other ancestors had LWS pigments. Multiple regression analyses of ancestral and contemporary MWS and LWS pigments show that single mutations S180A, H197Y, Y277F, T285A, A308S, and double mutations S180A/H197Y shift the λmax of the pigments by −7, −28, −8, −15, −27, and 11 nm, respectively. It is most likely that this “five-sites” rule is the molecular basis of spectral tuning in the MWS and LWS pigments during vertebrate evolution.

scholarly journals Device Modeling of Quantum Dot–Organic Light Emitting Diodes for High Green Color Purity

2021 ◽  
Vol 11 (6) ◽  
pp. 2828
Author(s):  
Byoung-Seong Jeong
Keyword(s):  
Quantum Dot ◽  
Emission Spectrum ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Wavelength Band ◽  
Light Emitting ◽  
Green Color ◽  
Organic Light

In this study, the optimal structure for obtaining high green color purity was investigated by modeling quantum dot (QD)–organic light-emitting diodes (OLED). It was found that even if the green quantum dot (G-QD) density in the G-QD layer was 30%, the full width at half maximum (FWHM) in the green wavelength band could be minimized to achieve a sharp emission spectrum, but it was difficult to completely block the blue light leakage with the G-QD layer alone. This blue light leakage problem was solved by stacking a green color filter (G-CF) layer on top of the G-QD layer. When G-CF thickness 5 μm was stacked, blue light leakage was blocked completely, and the FWHM of the emission spectrum in the green wavelength band was minimized, resulting in high green color purity. It is expected that the overall color gamut of QD-OLED can be improved by optimizing the device that shows such excellent green color purity.

scholarly journals Rayleigh match ranges of red/green color-deficient observers: Psychophysical and molecular studies

1997 ◽  
Vol 37 (14) ◽  
pp. 1897-1907 ◽  
Author(s):  
Elizabeth Sanocki ◽  
Davida Y. Teller ◽  
Samir S. Deeb
Keyword(s):  
Green Color ◽  
Molecular Studies

scholarly journals Electrostatic theory for designing lossless negative permittivity metamaterials

2010 ◽  
Vol 35 (9) ◽  
pp. 1431 ◽  
Author(s):  
Yong Zeng ◽  
Qi Wu ◽  
Douglas H. Werner
Keyword(s):  
Negative Permittivity ◽  
Electrostatic Theory

scholarly journals Color Tuning Mechanism of Human Red, Green, and Blue Cone Pigments: SAC-CI Theoretical Study

2009 ◽  
Vol 82 (9) ◽  
pp. 1140-1148 ◽  
Author(s):  
Kazuhiro Fujimoto ◽  
Jun-ya Hasegawa ◽  
Hiroshi Nakatsuji
Keyword(s):  
Theoretical Study ◽  
Color Tuning ◽  
Tuning Mechanism ◽  
Cone Pigments
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