Joanna Fiedor, Leszek Fiedor, Nina Kammhuber, Avigdor Scherz, Hugo Scheer
Bacteriochlorophyll (BChl) derivatives (with central Mg replaced by metal “M”) ([M]-BChl with M = 2H, Mg, Zn, Pd, Cu) have been investigated for their photodynamic capacity and stability toward...
Joanna Fiedor, Leszek Fiedor, Johannes Winkler, Avigdor Scherz, Hugo Scheer
Carotenoids are well-known physical quenchers of chlorophyll excited states and reactive oxygen species both in vivo and in vitro. They may also be involved in chemical quenching undergoing, e.g....
The reversible photochemistry of the α-subunit of phycoerythrocyanin (α-PEC) has been measured by low temperature absorption and circular dichroism in the range of 125K to 295 K. Below...
Sharkov, A. V., Kryukov, I. V., Khoroshilov, E. V., Kryukov, P. G., Fischer, R., Scheer, Hugo, ...
Polarization pump-probe femtosecond spectroscopy was used to investigate photoinduced optical density changes in allophycocyanin (APC) trimers at 635–690 nm after excitation with 230-fs pulses at...
Effects of vinyl substitutions on resonance Raman spectra of (bacterio)chlorophylls (1994)
Feiler, Ute, Mattioli, Tony A., Katheder, Ingrid, Scheer, Hugo, Lutz, M., Robert, B.
Soret resonance and Qy preresonance Raman spectra are reported and compared for a series of (bacterio)chlorophylls. Chlorophyll a, 2-acetylchlorophyll a, bacteriochlorophyll a and...
Greis, J. W., Angerhofer, A., Norris, J. R., Scheer, Hugo, Struck, A., Schuetz, J. U.
Zero field absorption detected magnetic resonance hole burning measurements were performed on photosynthetic reaction centers of the bacteria Rhodobacter sphaeroides R26 and Rhodopseudomonas viridis....
EPR, ENDOR, and TRIPLE resonance studies of modified bacteriochlorophyll cation radicals (1994)
Käß, H., Rautter, J., Zweygart, W., Struck, A., Scheer, Hugo, Lubitz, W.
A series of substituted bacteriochlorophyll molecules, all used in reconstitution experiments of reaction centers of Rhodobacter sphaeroides (Struck et al. Biochim. Biophys. Acta 1991, 1060,...
Leupold, D., Neef, E., Voigt, B., Nowak, F., Ehlert, J., Hirsch, J., ...
Limantara, Leenawaty, Koyama, Yasushi, Katheder, Ingrid, Scheer, Hugo
15N-substituted bacteriochlorophyll a (BChl a) was extracted from the cells of Rhodobacter sphaeroides 2.4.1 grown in a medium containing 15N-ammonium sulfate and yeast concentrate. The T1 Raman...
Porra, Robert J., Schäfer, Wolfram, Cmiel, Edmund, Katheder, Ingrid, Scheer, Hugo
The mechanism of formation of the formyl group of chlorophyll b has long been obscure but, in this paper, the origin of the 7-formyl-group oxygen of chlorophyll b in higher plants was determined by...
Schmidt, S., Arlt, T., Hamm, P., Huber, H., Nägele, T., Wachtveitl, J., ...
The modification of reaction centers from Rhodobacter sphaeroides by the introduction of pheophytins instead of bacteriopheophytins leads to interesting changes in the primary photosynthetic...
Schneider, S., Jäger, W., Prenzel, C. J., Brehm, G., Maruthi Sai, P. S., Scheer, Hugo, ...
Three building blocks of the antenna complexes of the cyanobacterium Westiellopsis prolifica were studied: PEC(X), which is similar to the α-subunit of phycoerythrocyanin (PEC), trimers of PEC and...
Resonance-enhanced CARS spectroscopy of biliproteins (1994)
Schneider, S., Prenzel, C. J., Brehm, G., Gottschalk, L., Zhao, K. H., Scheer, Hugo
Teuchner, K., Stiel, H., Leupold, D., Katheder, Ingrid, Scheer, Hugo
By means of fluorescence spectroscopy and nonlinear absorption experiments, excited-state processes of the modified pigments [3-acetyl]-chlorophyll a, [31-OH]-bacteriochlorophyll a and...
Gottschalk, L., Scherz, A., Scheer, Hugo
The core linker polypeptide Lc 8.9 was isolated from Mastigocladus laminosus and purified on a preparative scale. A method for the reconstitution of allophycocyanin (AP)—linker complexes from...
Leupold, D., Voigt, B., Pfeiffer, M., Bandilla , M., Scheer, Hugo
Nonlinear polarization spectroscopy in the frequency domain allows rate constant determinations of fast electronic energy and phase relaxations together with characterization of the type of line...
TWO DIFFERENT TYPES OF PHOTOCHEMISTRY IN PHYCOERYTHROCYANIN α-SUBUNIT (1993)
Hong, Q., Zhao, K. H., Scheer, Hugo
The photochemical activities of phycoerythrocyanin α-subunits from Mastigocladus laminosus separated by isoelectric focusing were tested by irradiating at 500, 550, 577 and 600 nm. Two types of...
Maruthi Sai, P. S., Siebzehnrübl, S., Mahajan, S., Scheer, Hugo
Two phycoerythrocyanin (PEC) fractions have been obtained from the phycobilisomes of the cyanobac-terium Westiellopsis prolifica ARM 365. They have been characterized by absorption, fluorescence and...
Schneider, S., Prenzel, C. J., Brehm, G., Gedeck, P., Maruthi Sai, P. S., Gottschalk, L., ...
Resonance-enhanced coherent anti-Stokes Raman spectra are recorded for monomers and trimers of phycocyanin from three different cyanobacteria: Westiellopsis prolifica, Mastigocladus laminosus and...
Förster energy transfer between neighbouring chromophores in C-phycocyanin trimers (1993)
Gillbro, T., Sharkov, A. V., Kryukov, I. V., Khoroshilov, E. V., Kryukov, P. G., Fischer, R., ...
The excitation-energy transfer in C-phycocyanin (C-PC) trimers and monomers isolated from phycobilisomes of Mastigocladus laminosus has been studied by polarization femtosecond laser spectroscopy....
Bacteriochlorophyll aggregates in positively charged micelles (1993)
Gottstein, J., Scherz, A., Scheer, Hugo
Micellar complexes were prepared from bacteriochlorophyll a and bacteriopheophytin a with the cationic detergents, cetyltrimethyl ammonium bromide and cetylpyridinium chloride. These complexes have...
The accessory bacteriochlorophyll (1993)
Arlt, T., Schmidt, S., Kaiser, W., Lauterwasser, Christoph, Meyer, M., Scheer, Hugo, ...
The primary electron transfer in reaction centers of Rhodobacter sphaeroides is studied by subpicosecond absorption spectroscopy with polarized light in the spectral range of 920-1040 nm. Here the...
Subpicosecond emission studies of bacterial reaction centers (1993)
Hamm, P., Gray, K. A., Oesterhelt, D., Feick, R., Scheer, Hugo
The spontaneous emission of reaction centers from native and mutated Rhodobacter sphaeroides and from wild type Chloroflexus aurantiacus is investigated by fluorescence up-conversion with high...
Frank, H. A., Chynwat, V., Hartwich, G., Meyer, M., Katheder, Ingrid, Scheer, Hugo
Triplet state electron paramagnetic resonance (EPR) experiments have been carried out at X-band on Rb. sphaeroides R-26 reaction centers that have been reconstituted with the carotenoid, spheroidene,...
Femtosecond excitation transfer processes in biliprotein trimers (1993)
Sharkov, A. V., Khoroshilov, E. V., Kryukov, I. V., Palsson, L. O., Kryukov, P. G., Fischer, R., ...
Femtosecond spectroscopy of the primary electron transfer in photosynthetic reaction centers (1993)
Lauterwasser, Christoph, Finkele, U., Struck, A., Scheer, Hugo, Zinth, Wolfgang
Femtosecond spectroscopy of the primary electron transfer in photosynthetic reaction centers (1993)
Lauterwasser, Christoph, Finkele, U., Struck, A., Scheer, Hugo, Zinth, Wolfgang
Femtosecond Förster energy transfer over 20 A in Phycoerythrocyanin (PEC) trimers (1993)
Palsson, L. O., Gillbro, T., Sharkov, A. V., Fischer, R., Scheer, Hugo
Porra, R. J., Schäfer, W., Cmiel, E., Katheder, Ingrid, Scheer, Hugo
Using mass spectroscopy, we demonstrate as much as 93% enrichment of the 7-formyl group oxygen of chlorophyll b when dark-grown, etiolated maize leaves are greened under white light in the presence...
Bacterial reaction centers with modified chromophores (1993)
Scheer, Hugo, Cmiel, E., Fischer, M., Göbel, A., Hartwich, G., Meyer, M., ...
Photophysics of modified photosynthetic pigments (1993)
Scheer, Hugo, Stiel, H., Teuchner, K., Katheder, Ingrid, Leupold, D.
Femtosecond excitation transfer in allophycocyanin (1993)
Sharkov, A. V., Khoroshilov, E. V., Kryukov, I. V., Kryukov, P. G., Gillbro, T., Fischer, R., ...
Bacteriochlorophyll aggregates in positively charged micelles (1993)
Gottstein, J., Scherz, A., Scheer, Hugo
Micellar complexes were prepared from bacteriochlorophyll a and bacteriopheophytin a with the cationic detergents, cetyltrimethyl ammonium bromide and cetylpyridinium chloride. These complexes have...
Subpicosecond emission studies of bacterial reaction centers (1993)
Hamm, P., Gray, K.A., Oesterhelt, D., Feick, R., Scheer, Hugo, Zinth, Wolfgang
The spontaneous emission of reaction centers from native and mutated Rhodobacter sphaeroides and from wild type Chloroflexus aurantiacus is investigated by fluorescence up-conversion with high...
Feist, Alessandro, Friedrich, Joseph, Gottschalk, Lothar, Scheer, Hugo
Persistent optical hole burning has been performed in the allophycocyanin band of phycobilisomes of Mastigocladus laminosus. The homogeneous transition line width has been obtained by a careful...
Finkele, U., Lauterwasser, Christoph, Struck, A., Scheer, Hugo, Zinth, Wolfgang
The primary electron transfer has been investigated by femtosecond time-resolved absorption spectroscopy in two chemically modified reaction centers (RC) of Rhodobacter sphaeroides, in which the...
Dissociating effect of chromophore modifications on C-phycocyanin heterohexamers (1992)
The bilin chromophores of the α or β subunit of C-phycocyanin (PC) from Mastigocladus laminosus were modified, and subsequently recombined with the respective complementary unmodified chromophores....
Femtosecond energy transfer processes in allophycocyanin and C-phycocyanin trimers (1992)
Khoroshilov, E. V., Kryukov, I. V., Kryukov, P. G., Sharkov, A. V., Gillbro, T., Fischer, R., ...
Maruthi Sai, P. S., Siebzehnrübl, S., Mahajan, S., Scheer, Hugo
Phycoerythrocyanin or fractions enriched in it have been isolated from the filamentous cyanobacteria, Westiellopsis prolifica ARM 365 and Nostoc rivulare ARM 212. Both show the photoreversible...
Femtosecond energy transfer between chromophores in allophycocyanin trimers (1992)
Sharkov, A. V., Kryukov, I. V., Khoroshilov, E. V., Kryukov, P. G., Fischer, R., Scheer, Hugo, ...
Ultrafast energy-transfer processes in allophycocyanin (APC) trimers from Mastigocladus laminosus have been examined by a femtosecond absorption technique. Isotropic absorption recovery kinetics with...
Epimerization of chlorophyll derivatives (1992)
Mazaki, H., Watanabe, T., Takahashi, T., Struck, A., Scheer, Hugo
Pheophytinisation of eight chlorophyll derivatives in aqueous acetone (1992)
Mazaki, H., Watanabe, T., Takahashi, T., Struck, A., Scheer, Hugo
Bacteriochlorophylls modified at position C-3 (1992)
Struck, A., Cmiel, E., Katheder, Ingrid, Schäfer, W., Scheer, Hugo
[3-Vinyl]-bacteriochlorophyll a and related pigments modified at C-3 and/or C-132 have been synthesized from bacteriochlorophyll a. The reactivity at C-3 is strongly influenced by the C-132...
Lauterwasser, Christoph, Finkele, U., Struck, A., Scheer, Hugo, Zinth, Wolfgang
The primary electron transfer has been investigated by femtosecond time-resolved absorption spectroscopy in two chemically modified reaction centers (RC) of Rhodobacter sphaeroides, in which the...
Lauterwasser, Christoph, Finkele, U., Scheer, Hugo, Zinth, Wolfgang
The primary electron transfer (ET) in reaction centers (RC) of Rhodobacter sphaeroides is investigated as a function of temperature with femtosecond time resolution. For temperatures from 300 to 25 K...
Modified bacterial reaction centers (1991)
Struck, A., Mueller, A., Scheer, Hugo
Pigments of borohydride-treated reaction centers of Rhodobacter sphaeroides R 26 and Rhodopseudomonas viridis were analyzed by HPLC with polychromatic detection. In both species, pigment composition...
Picosecond time-resolved fluorescence of phycobiliproteins (1990)
Fischer, R., Gottstein, J., Scheer, Hugo, Geiselhart, P., Schneider, S.
The α- and β-subunits of C-phycocyanin from Mastigocladus laminosus were prepared according to revised procedures. Both subunits are isolated as dimers, which can be dissociated into monomers with...
Initial electron-transfer in the reaction center from Rhodobacter sphaeroides. (1990)
Holzapfel, W., Finkele, R., Kaiser, W., Oesterhelt, D., Scheer, Hugo, Stilz, H. U., ...
The initial electron transfer steps in the photosynthetic reaction center of the purple bacterium Rhodobacter sphaeroides have been investigated by femtosecond time-resolved spectroscopy. The...
Fourier-transform Raman spectroscopy applied to photobiological systems. (1990)
Sawatzki, J., Fischer, R., Scheer, Hugo, Siebert, F.
Fluorescence and initiation of photoreactions are problems frequently encountered with resonance Raman spectroscopy of photobiological systems. These problems can be circumvented with...