TY  - JOUR
A1  - Jansen, Nils
A1  - Ohlendorf, Birgit
A1  - Erhard, Arlette
A1  - Bruhn, Torsten
A1  - Bringmann, Gerhard
A1  - Imhoff, Johannes F.
T1  - Helicusin E, Isochromophilone X and Isochromophilone XI: New Chloroazaphilones Produced by the Fungus Bartalinia robillardoides Strain LF550
JF  - Marine Drugs
N2  - Microbial studies of the Mediterranean sponge Tethya aurantium led to the isolation of the fungus Bartalinia robillardoides strain LF550. The strain produced a number of secondary metabolites belonging to the chloroazaphilones. This is the first report on the isolation of chloroazaphilones of a fungal strain belonging to the genus Bartalinia. Besides some known compounds (helicusin A (1) and deacetylsclerotiorin (2)), three new chloroazaphilones (helicusin E (3); isochromophilone X (4) and isochromophilone XI (5)) and one new pentaketide (bartanolide (6)) were isolated. The structure elucidations were based on spectroscopic analyses. All isolated compounds revealed different biological activity spectra against a test panel of four bacteria: three fungi; two tumor cell lines and two enzymes.
KW  - tethya aurantium
KW  - marine natural product
KW  - azaphilone
KW  - pentaketide
KW  - bartalinia robillardoides
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-129649
VL  - 11
IS  - 3
ER  - 
TY  - JOUR
A1  - Brixner, Tobias
A1  - Koch, Federico
A1  - Kullmann, Martin
A1  - Selig, Ulrike
A1  - Nuernberger, Patrick
A1  - Götz, Daniel C. G.
A1  - Bringmann, Gerhard
T1  - Coherent two-dimensional electronic spectroscopy in the Soret band of a chiral porphyrin dimer
JF  - New Journal of Physics
N2  - Using coherent two-dimensional (2D) electronic spectroscopy in fully noncollinear geometry, we observe the excitonic coupling of β,β'-linked bis[tetraphenylporphyrinato-zinc(II)] on an ultrafast timescale in the excited state. The results for two states in the Soret band originating from an excitonic splitting are explained by population transfer with approximately 100 fs from the energetically higher to the lower excitonic state. This interpretation is consistent with exemplary calculations of 2D spectra for a model four-level system with coupling.
KW  - optics
KW  - quantum optics
KW  - laser
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-96139
ER  -