Reflectin is an intrinsically disordered protein known for its ability to modulate the biophotonic camouflage of cephalopods based on assembly-induced osmotic properties. Its reversible self-assembly into discrete, size-controlled clusters and condensed droplets are depend sensitively net charge, making reflectin stimuli-responsive pH, phosphorylation, electric fields. Despite considerable efforts characterize this behavior, detailed physical mechanisms reflectin's assembly not yet fully...

The binding of the soluble cytoplasmic protein FliG to transmembrane FliF is one first interactions in assembly bacterial flagellum. Once established, this interaction integral keeping flagellar ring, responsible for both transmission torque and control rotational direction flagellum, anchored central ring on which flagellum assembled. Here we isolate characterize between N-terminal domain Thermotoga maritima (FliGN) peptides corresponding conserved C-terminal portion T. FliF. Using nuclear...

Discovery that reflectin proteins fill the dynamically tunable Bragg lamellae in reflective skin cells of certain squids has prompted efforts to design new reflectin-inspired systems for dynamic photonics. But insights into actual role and mechanism action reflectins constrain better define opportunities limitations rationally designing optical with reflectin-based components. We our colleagues have discovered function as a signal-controlled molecular machine, regulating an osmotic motor...

Reflectin is a cationic, block copolymeric protein that mediates the dynamic fine-tuning of color and brightness light reflected from nanostructured Bragg reflectors in iridocyte skin cells squids. In vivo, neuronally activated phosphorylation reflectin triggers its assembly, driving osmotic dehydration membrane-bounded lamellae containing to simultaneously shrink lamellar thickness spacing while increasing their refractive index contrast, thus tuning wavelength reflectance. vitro, we show...

The electro-optic properties of polymer films are measured by an original technique whereby a periodic sequence poling and probing steps permits alternation the application orientation dephasing potentials. Relaxation dynamics coefficient Red–Acid–Magly crosslinkable is studied as function temperature samples. time constant decay τ at several temperatures found to follow Vogel–Fulcher–Tamann—Hesse dependence, for above glass transition. Poling samples in presence pulsed electric field leads...

We report measurements on the isothermal relaxation dynamics of electro-optic coefficient electric field poled polymeric films. The studied copolymer is a side-chain Disperse Red 1/poly–methyl–metacrylate combination. shown to follow Kohlrausch–Williams–Watts stretched exponential dependence, whose parameters are strongly dependent temperature. average decay constant an Arrhenius temperature dependence below glass transition Tg, while it described by Vogel–Fulcher–Tamann–Hesse above Tg....

The electro-optic properties of a ne~v ariety cross-linked polymer referred to as Red-acid Magly are being reported.Its linear and nonlinear optical characterized in comparison with the classical side-chain DRI-MMA.The combined curing poling processes optimized so improve thermal stability properties.Polymer films shown sustain high coefficient 12 pm/V at 1.32 ~m during several weeks 85 °C.An phase modulator based on this has been fabricated demonstrated.

The reflectin proteins have been extensively studied for their role in reflectance cephalopods. In the recently evolved Loliginid squids, these and structural color they regulate are dynamically tunable, enhancing effectiveness camouflage communication. species, reflectins found highest concentrations within structurally membrane enclosed, periodically stacked lamellae of subcellular Bragg reflectors intracellular vesicles specialized skin cells known as iridocytes leuocophores,...

Phosphorylation is among the most widely distributed mechanisms regulating tunable structure and function of proteins in response to neuronal, hormonal environmental signals. We demonstrate here that low-voltage electrochemical reduction histidine residues reflectin A1, a protein mediates neuronal fine-tuning colour reflected from skin cells for camouflage communication squids, acts as an vitro surrogate phosphorylation vivo , driving assembly previously shown regulate its function. Using...

The fabrication and characterization of BRS lasers monolithically integrated with butt-coupled polymer-based buried strip waveguides is presented. Threshold currents one cleaved etched mirror facets are 15-18 mA waveguide output powers in excess 5 mW at 100 laser driving for 600 μm long waveguides. device exhibits a total insertion loss less than dB. potentially suitable as building-block photonic circuits.

Crosslinking of polymers with dipoles can be followed by means dielectric, pyroelectric, and in situ electro-optic measurements. All three techniques provide similar insights as to the cross-linking process. In addition, measurements allow for determination resulting optical nonlinearity. After crosslinking is completed polymer behaves like a side-chain polymer. photoinduced poling an already cross-linked dipolar network demonstrated.

Abstract Reflectin is a cationic, block copolymeric protein that mediates the dynamic fine-tuning of color and brightness light reflected from nanostructured Bragg reflectors in iridocyte skin cells squids. In vivo, neuronally activated phosphorylation reflectin triggers its assembly, driving osmotic dehydration membrane-bounded lamellae containing to simultaneously shrink lamellar thickness spacing while increasing refractive index contrast, thus tuning wavelength reflectance. vitro, we...

The intrinsically disordered reflectin proteins drive tunable reflectivity for dynamic camouflage and communication in the recently evolved Loliginidae family of squid. Previous work revealed that A1 forms discrete assemblies whose size is precisely predicted by protein net charge density (NCD) screening local anion concentration. Using light scattering (DLS), Forster resonant energy transfer (FRET) confocal microscopy, we show these assemblies, which 95-99% bulk solution partitioned into,...

Abstract Reflectin proteins are widely distributed in reflective structures cephalopods, but only Loliginid squids they and the sub-wavelength photonic control dynamically tunable, driving changes skin color for camouflage communication. The reflectins block copolymers with repeated canonical domains interspersed cationic linkers. Neurotransmitter-activated signal transduction culminates catalytic phosphorylation of tunable reflectins’ linkers, resulting charge-neutralization overcoming...

Reflectin proteins are found in the reflective Bragg lamellae skin cells of certain squids, where they tunably control color for camouflage and communication. Initially disordered monomeric form, reflectins have unusual amino acid compositions block copolymers consisting polyampholytic canonical repeats interspersed with cationic linkers. In vivo, phosphorylation linkers induces condensation, secondary folding hierarchical assembly concomitant emergence tunable iridescence. We analyzed...

The intrinsically disordered reflectin proteins fill the reflective Bragg lamellae of iridescent cells in squid. In vivo, phosphorylation cationic reflectins leads to protein condensation and hierarchical assembly, driving osmotic dehydration causing enhancement intensity tuning color reflected light. vitro, purified monomeric can be driven cyclably tunably assemble by pH‐neutralization or addition salt, forming spheres low polydispersity reproducible size. Analysis assembly dynamic light...