Concept

Rhodopsine

Publications associées (50)

An artificial molecular switch that mimics the visual pigment and completes its photocycle in picoseconds

Majed Chergui, Andrea Cannizzo, Stefan Haacke

Single mols. that act as light-energy transducers (e.g., converting the energy of a photon into at.-level mech. motion) are examples of minimal mol. devices. Here, we focus on a mol. switch designed by merging a conformationally locked diarylidene skeleton ...

2008

Vibrational coherences of the protonated Schiff base of all-trans-retinal in solution

Majed Chergui, Goran Zgrablic, Stefan Haacke

Modulations in the time gated ultrafast fluorescence of the protonated Schiff base of retinal in various solvents are reported, which reflect the creation and evolution of vibrational wave packets due to the torsional mode of retinal of frequency .apprx.12 ...

2007

On the excitation wavelength dependence of the fluorescence of bacteriorhodopsin

Majed Chergui, Erwin Portuondo Campa, Goran Zgrablic, Stefan Haacke, Selma Schenkl

We present a systematic study of the time-integrated fluorescence of native bacteriorhodopsin, as a function of excitation wavelength across the visible absorption band. While the fluorescence max. is unaffected, the spectrum broadens on the high-energy si ...

2007

Insights into excited-state and isomerization dynamics of bacteriorhodopsin from ultrafast transient UV absorption

Majed Chergui, Frank van Mourik, Selma Schenkl

A visible-pump/UV-probe transient absorption is used to characterize the ultrafast dynamics of bacteriorhodopsin with 80-fs time resoln. We identify three spectral components in the 265- to 310-nm region, related to the all-trans retinal, tryptophan (Trp)- ...

2006

Perceptual learning with spatial uncertainties

Michael Herzog, Thomas Otto

In perceptual learning, stimuli are usually assumed to be presented to a constant retinal location during training. However, due to tremor, drift, and microsaccades of the eyes, the same stimulus covers different retinal positions on sequential trials. Bec ...

Elsevier2006

Solvent effects on the ultrafast dynamics of the retinal chromophore of bacteriorhodopsin

Goran Zgrablic

Photo-induced excited-state reactions stand in the center of function of the photosensitive biological systems. These reactions can be accompanied by structural changes of the chromophore (for example isomerization) which are influenced by the nearest envi ...

EPFL2006

Solvent and protein effects on the structure and dynamics of the rhodopsin chromophore

Ursula Röthlisberger, Leonardo Guidoni

The structure and dynamics of the retinal chromophore of rhodopsin are investigated systematically in different environments (vacuum, methanol soln., and protein binding pocket) and with different computational approaches (classical, quantum, and hybrid qu ...

2005

Probing the ultrafast charge translocation of photoexcited retinal in bacteriorhodopsin

Majed Chergui, Frank van Mourik, Selma Schenkl

The ultrafast evolution of the electric field within bacteriorhodopsin was measured by monitoring the absorption changes of a tryptophan residue after excitation of retinal. The Trp absorption decreases within the first 200 femtoseconds and then recovers o ...

2005

Ultrafast Excited State Dynamics of the Protonated Schiff Base of All-trans Retinal in Solvents

Goran Zgrablic

We present a comparative study of the ultrafast photophysics of all-trans retinal in the protonated Schiff base form in solvents with different polarities and viscosities. Steady-state spectra of retinal in the protonated Schiff base form show large absorp ...

2005

A novel planar magnetic sensor based on orthogonal fluxgate principle

Radivoje Popovic, Pavel Kejik, Franck Vincent, Ozge Zorlu

In this paper, we present a new planar fluxgate magnetometer structure. The sensor has the orthogonal fluxgate configuration which makes the detection part independent of the excitation mechanism. The sensor consists of a ferromagnetic cylindrical core cov ...

2005

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