Probing the Fucoxanthin-Chlorophyll /-Binding Proteins (FCPs) of the Marine Diatom sp. by Resonance Raman Spectroscopy.

We report resonance Raman spectra of the light-harvesting fucoxanthin-chlorophyll /-binding proteins (FCPs) of marine diatom sp. The Raman shifts in the N-isotope-enriched diatom provide the first spectroscopic evidence for the characterization of the C-N marker bands and, thus, of the penta- and hexacoordinated states of chlorophylls / in the FCPs. Under 405 and 442 nm Raman excitations, all of the marker bands of Chl / are observed and the isotope-based assignments provide new information concerning the structure of Chls / in the FCPs and their interactions with the protein environment.

Microstructure-driven annihilation effects and dispersive excited state dynamics in solid-state films of a model sensitizer for photon energy up-conversion applications.

Bimolecular processes involving exciton spin-state interactions gain attention for their deployment as wavelength-shifting tools. Particularly triplet-triplet annihilation induced photon energy up-conversion (TTA-UC) holds promise to enhance the performance of solar cell and photodetection technologies. Despite the progress noted, a correlation between the solid-state microstructure of photoactuating TTA-UC organic composites and their photophysical properties is missing.

Evidence for reversible light-dependent transitions in the photosynthetic pigments of diatoms.

Marine diatoms contribute to oxygenic photosynthesis and carbon fixation and handle large changes under variable light intensity on a regular basis. The unique light-harvesting apparatus of diatoms are the fucoxanthin-chlorophyll /-binding proteins (FCPs). Here, we show the enhancement of chlorophyll / (Chl /), fucoxanthin (Fx), and diadinoxanthin (Dd) marker bands in the Raman spectra of the centric diatom , which allows distinction of the pigment content in the cells grown under low- (LL) and high-light (HL) intensity at room temperature.

Application of double-pulse laser-induced breakdown spectroscopy (DP-LIBS), Fourier transform infrared micro-spectroscopy and Raman microscopy for the characterization of copper-sulfides.

The combined application of the structure sensitive techniques Fourier transform infrared μ-spectroscopy and Raman microscopy in conjunction with different approaches of laser-induced breakdown spectroscopy (LIBS) including the two-color double pulse (DP-LIBS) have been applied towards the characterization of whole ore copper-sulfide minerals. Discrete information from the surface of the whole ore minerals that lead to the establishment of infrared marker bands and from the surface of bioleached samples that allow the monitoring of jarosite and biofilm formation are provided by FTIR mapping experiments. Raman data can provide information related to the type of the mineral and of the secondary minerals formed on the surface of the ore.

Photoreduction of carotenoids in the aerobic anoxygenic photoheterotrophs probed by real time Raman spectroscopy.

The Aerobic anoxygenic phototrophic bacteria (AAPB) Roseobacter denitrificans and Roseobacter litoralis are widespread in the bacterioplankton community with a particular role in the marine carbon cycle. Measurements of carotenoids isolated from dark-grown cells indicated the presence of spheroidenone (SO, N = 11) and of 3,4 dihydrospheroidenone (N = 10) in the carotenoids isolated from illuminated cells. Time-dependent Raman 514 nm excitation experiments of R.