Author: Christian Schütt

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AUTHOR

Christian Schütt

showing 9 related works from this author

Coordination-Induced Spin-State Switching with Nickel Chlorin and Nickel Isobacteriochlorin

2015

We present the first coordination-induced spin-state switching with nickel chlorin and nickel isobacteriochlorin. The spin-state switching was monitored by UV-vis spectroscopy and NMR titration experiments. The association constants (K1 and K2) and thermodynamic parameters (ΔH and ΔS) of the coordination of pyridine were determined. The first X-ray analyses of a paramagnetic nickel chlorin and a nickel isobacteriochlorin provide further information about the structure of the octahedral complexes. Nickel chlorin and even more pronounced nickel isobacteriochlorin exhibit stronger coordination of axial ligands compared to the corresponding nickel porphyrin and thus provide the basis for more e…

inorganic chemicalsSpin stateschemistry.chemical_elementNanotechnologynickel chlorins010402 general chemistry01 natural sciencesInorganic ChemistryParamagnetismchemistry.chemical_compoundsquare-planar platformsPyridinepolycyclic compoundsotorhinolaryngologic diseasesPhysical and Theoretical ChemistrySpectroscopynickel porphyrinsta116010405 organic chemistryPorphyrinnickel isobacteriochlorins0104 chemical sciencesCrystallographyNickelchemistryOctahedronChlorinInorganic Chemistry

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Neuroactive compounds produced by bacteria from the marine sponge Halichondria panicea: activation of the neuronal NMDA receptor

1998

Abstract Previous studies revealed that the marine sponge Halichondria panicea habors symbiotic- and commensalic bacteria ( Althoff et al., 1998 . Marine Biol. 130, 529–536). In the present study the hypothesis was tested whether some of those bacteria synthesize neuroactive compounds. For the first time the effect of bacterial bioactive compounds on the neuronal ionotropic glutamate receptors [iGluR], subtype N -methyl- d -aspartate (NMDA) receptor, was checked. In cortical neurons from rats as cell system the supernatant of two bacterial cultures isolated from H. panicea proved to agonize the NMDA receptor. The response of the NMDA receptor to the bioactive compounds was determined by mea…

PharmacologybiologyHealth Toxicology and MutagenesisGlutamate receptorMemantineGeneral MedicineToxicologybiology.organism_classificationHalichondria paniceaBiochemistrymedicineIonotropic glutamate receptorNMDA receptorReceptorBacteriaIonotropic effectmedicine.drugEnvironmental Toxicology and Pharmacology

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Evidence for a symbiosis between bacteria of the genus Rhodobacter and the marine sponge Halichondria panicea : harbor also for putatively toxic bac…

1998

Halichondria panicea (Pallas) is a marine sponge, abundantly occurring in the Adriatic sea, North sea and Baltic sea. It was the aim of the present study to investigate if this sponge species harbors bacteria. Cross sections through H. panicea were taken and inspected by electron microscopy. The micrographs showed that this sponge species is colonized by bacteria in its mesohyl compartment. To identify the bacteria, polymerase chain reaction (PCR) analysis of the 16S rRNA gene segment, typical for bacteria, was performed. DNA was isolated from sponge material that had been collected near Rovinj (Adriatic Sea), Helgoland (North Sea), and Kiel (Baltic Sea) and was amplified with bacterial pri…

RhodobacterEcologybiologyZoologyAquatic Sciencebiology.organism_classification16S ribosomal RNAHalichondria paniceaMicrobiologySpongeSymbiosissponges; Halochondria; bacteria; Rhodobacter; symbiosis; toxicityMesohylProteobacteriaEcology Evolution Behavior and SystematicsBacteriaMarine Biology

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Bacteria of the Genus Roseobacter Associated with the Toxic Dinoflagellate Prorocentrum lima

1998

The dinoflagellate Prorocentrum lima is known to produce diarrhetic shellfish poisons. However, it is yet unclear if the dinoflagellates themselves or the bacteria associated with them produce the toxins. Here we analyze the toxicity as well as the spectrum of bacteria in two cultures of P. lima, namely P. lima-SY and P. lima-ST, which initially derived from the same P. lima strain PL2V. Toxicity tests, applying the Artemia bioassay revealed in both cultures high levels of toxins. The bacteria, associated with the two cultures, were identified by PCR/nucleotide sequence analysis of the 16S rRNA gene. From cultures of P. lima-SY the dominant sequence was found to share a 93.7% similarity wit…

biologyDinoflagellateRoseobacterBartonella tayloriibiology.organism_classification16S ribosomal RNAMicrobiologyMicrobiologyAgar platefluids and secretionsparasitic diseasespopulation characteristicsRhizobiumAxenicgeographic locationsBacteriaProtist

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