Haake, Elmar
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Item-typ:Veröffentlichung, Synthese von Chlorinen mit annellierten Lactamringen als Untereinheiten für künstliche Photosynthese-Modellsysteme(1998-03-11); ; ; The dissertation subsumes to the actual photosynthetic research, which is engaged in discussions about details of biological photosynthetic processes. At the present time the synthesis of artificial modelsystems is aimed to abstract functional and structural aspects of natural photosynthetic-reaction center. These modelsystems allow investigations of processes under defined conditions. The dissertation describes the synthesis of chlorines with annellated lactame rings from cyclohept-4-enone and pyrrolic building blocks, which should be used as potential subunits for artificial photosynthtetic-reactioncenters. On attemps to synthesize differrent pyrrolic chlorin prebuilding blocks the synthesis of 5-formyl-2-cyanopyrrole was evolved. After linkage of this pyrrolic building block with an ABC-tricycle the cyclisation to chlorins containing an annellated ring were successful. After cleavage of a protecting group the chlorines underwent Beckmann-rearrangement which delivers chlorines with annellated lactame rings as potential subunits for photosynthetic-modelsystems.Dissertation421 122 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Synthesis of a chlorin with annelated lactam ring as subunit for artificial photosynthetic reaction centres(2018); ; Haake, ElmarA chlorin with an annelated cyclic ketone moiety was synthesized from a tricyclic nickel complex and appropriate pyrrole building blocks. Ketone functionality of the target chlorin allows Beckmann rearrangement to yield chlorin lactams. Lactam moieties on the chlorin represent masked amino acid structures which should allow formation of peptide-like backbones, along which chlorin pigments are arranged. Due to the natural chlorin chromophores and the peptide backbone the devices should represent artificial mimetics of natural photosynthesis systems.Wissenschaftlicher Artikel419 237 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Only the first results count: user-feedback-modified relevance ranking in E-LIB BremenUp to now, library catalogue ranking methods have largely ignored user feedback. However, in 2011, the State and University Library Bremen (SuUB) developed modified ranking methods for its own discovery system, Electronic Library Bremen (E-LIB Bremen). These make use of popularity factors such as click statistics and information about the number of editions published as well as how many copies of a given title are available. This customized development has enabled fast and flexible new retrieval functions to meet the needs of local users.Wissenschaftlicher Artikel238 192