@article{PeterWollenberger1997, author = {Peter, Martin G. and Wollenberger, Ursula}, title = {Phenol-oxidizing enzymes : mechanisms and applications}, year = {1997}, language = {en} } @misc{PeterStuppLentes1983, author = {Peter, Martin G. and Stupp, Hans-Peter and Lentes, Klaus-Ulrich}, title = {Umkehr der Enantioselektivit{\"a}t bei der enzymatischen Hydrolyse von Juvenilhormon als Ergebnis einer Proteinfraktionierung}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17001}, year = {1983}, abstract = {Aus dem Inhalt: Die Juvenilhormone 1a-c werden im Blut von Insekten enzymatisch zu den biologisch inaktiven Sluren hydrolysiert. Bei der Hydrolyse von racemischem 1c im Blut der Wanderheuschrecke Locusta migratoria wird ein Umsatz von 40-60\% erreicht. Das unumgesetzte Edukt enth{\"a}llt einen {\"U}berschuß an nat{\"u}rlich konfiguriertem (10R)-1c (e.e. 47.2\%). Wir konnten zeigen, daß das in der H{\"a}molymphe vorhandene Hormon-Bindungsprotein bevorzugt mit (10R)- 1c assoziiert.}, language = {de} } @misc{PeterMuivaYenesewetal.2009, author = {Peter, Martin G. and Muiva, Lois M. and Yenesew, Abiy and Derese, Solomon and Heydenreich, Matthias and Akala, Hoseah M. and Eyase, Fredrick and Waters, Norman C. and Mutai, Charles and Keriko, Joseph M. and Walsh, Douglas S.}, title = {Antiplasmodial β-hydroxydihydrochalcone from seedpods of Tephrosia elata}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-44437}, year = {2009}, abstract = {From the seedpods of Tephrosia elata, a new β-hydroxydihydrochalcone named (S)-elatadihydrochalcone was isolated. In addition, the known flavonoids obovatachalcone, obovatin, obovatin methyl ether and deguelin were identified. The structures were determined on the basis of spectroscopic evidence. The crude extract and the flavonoids obtained from the seedpods of this plant showed antiplasmodial activities. The literature NMR data on β-hydroxydihydrochalcones is reviewed and the identity of some of the compounds assigned β-hydroxydihydrochalcone skeleton is questioned.}, language = {en} } @article{PeterMiessner1997, author = {Peter, Martin G. and Miessner, Merle}, title = {Prim{\"a}rstoffwechsel, Shikimat- und Phenylpropan-Gruppe, Vitamine, Coenzyme, Pflanzeninhaltsstoffe}, year = {1997}, language = {de} } @article{PeterMerz1995, author = {Peter, Martin G. and Merz, A.}, title = {Stereoselective benzylic deprotonation in the enzymatic rearrangement of N-acetyldopamine derived o-Quinone to the p-Quinone methide}, issn = {0957-4166}, year = {1995}, language = {en} } @article{PeterLeyPetersenetal.1994, author = {Peter, Martin G. and Ley, J. P. and Petersen, Stefan and Londershausen, M. and Schumacher-Wandersleb, Michael H. M. G. and Spindler, Klaus-Dieter and Spindler-Barth, Margarethe and Turberg, Andreas}, title = {Synthesis of chitinase inhibitors}, year = {1994}, language = {en} } @misc{PeterFoerster1989, author = {Peter, Martin G. and F{\"o}rster, Hans}, title = {On the structure of Eumelanins : identification of constitutional patterns by solid-state NMR spectroscopy}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17027}, year = {1989}, abstract = {Aus dem Inhalt: Melanins are complex polyphenolic polymers. They are usually formed in nature by enzyme-catalyzed oxidative polymerization of o-diphenols. The deep black eumelanins, derived from Dopa 1 or dopamine 3, are distinguished from the yellow to brown phaeomelanins obtained from Dopa in the presence of cysteine. Characteristic of eumelanins are the indole units, which are formed from catecholamines by intramolecular addition of the amino groups to the oxidatively generated o-quinones. [...]}, language = {en} } @misc{PeterFoerster1989, author = {Peter, Martin G. and F{\"o}rster, Hans}, title = {Zur Struktur von Eumelaninen : Identifizierung von Konstitutionsmustern durch Festk{\"o}rper-NMR-Spektroskopie}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17038}, year = {1989}, abstract = {Aus dem Inhalt: Melanine sind komplexe polyphenolische Polymere. In der Natur entstehen sie durch meist enzymkatalysierte oxidative Polymerisation von o-Diphenolen. Man unterscheidet die aus Dopa 1 oder Dopamin 3 hervorgehenden, tiefschwarzen Eumelanine von den aus Dopa in Gegenwart von Cystein entstehenden, gelben bis braunen Phaomelaninen. [...]}, language = {de} } @misc{PeterBoldtNiedersteinetal.1990, author = {Peter, Martin G. and Boldt, Peter C. and Niederstein, Yvonne and Peter-Katalinić, Jasna}, title = {Synthesen von Galactose-Cluster-haltigen Steroid-Derivaten}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-16783}, year = {1990}, abstract = {The synthesis of galactose clusters that are linked to a steroid moiety by a peptide-like spacer unit is described. The galactose cluster is obtained by Koenigs-Knorr glycosylation of TRIS-Gly-Fmoc (2b) under Helferich conditions. Peptide and ester bonds are formed after activation of carboxylic acids as diphenylthiophene dioxide (TDO) esters. 6a is synthesized in a convergent way by coupling of (Ac4Gal)3-TRIS-Gly (3e) with cholesteryl TDO succinate (5b). Coupling of (Ac4Gal)3-TRIS-Gly hydrogen succinate (3f) with Gly-O-Chol (5d) by means of EEDQ yields 6d. Reaction of (Ac4Gal)3-TRIS-Gly-SUCC-O-TDO (3g) with 25-hydroxycholesterol leads in a linear sequence to the oxysterol derivative 6f. Selective cleavage of the acetyl groups from galactose units yields the known compound 6b and the new derivatives 6e and 6g.}, language = {de} } @misc{PeterAndersenHartmannetal.1992, author = {Peter, Martin G. and Andersen, Svend Olav and Hartmann, Rudolf and Miessner, Merle and Roepstorff, Peter}, title = {Catecholamine-protein conjugates : isolation of 4-phenylphenoxazin-2-ones from oxidative coupling of N-acetyldopamine with alipathic amino acids}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17571}, year = {1992}, abstract = {4-Phenylphenoxazinones were isolated after biomimetic oxidation, using diphenoloxidases of insect cuticle, mushroom tyrosinase, or after autoxidation of N-acetyldopamine (Image ) in the presence of β-alanine, β-alanine methyl ester or N-acetyl-L-lysine. They are formed presumably by addition of 2-aminoalkyl-5-alkylphenols to the o-quinone of biphenyltetrol which, in turn, arises from oxidative coupling of. The structures of present the first examples for the assembly of reasonably stable intermediates in the rather complex process of chemical modifications of aliphatic amino acid residues by o-quinones.}, language = {en} } @article{PeterAndersen1994, author = {Peter, Martin G. and Andersen, S. O.}, title = {The molecular architecture of the insect exoskeleton}, year = {1994}, language = {en} } @article{Peter2002, author = {Peter, Martin G.}, title = {Chitin and Chitosan from Animal Sources}, isbn = {3-527-30227-1}, year = {2002}, abstract = {A review on the chem. and biochem. of chitin and the chem. and application of chitosan. The following topics were discussed: structure of chitin and chitosan; occurrence and physiol. functions of chitin; detection of chitin in animals and anal. of chitin and chitosan; biosynthesis and biodegrdn. of chitin in animals; prodn. of chitin and chitosan; properties of chitin and chitosan; and applications of chitin and chitosan.}, language = {en} } @article{Peter2002, author = {Peter, Martin G.}, title = {Chitin and Chitosan from Fungi}, isbn = {3-527-30227-1}, year = {2002}, language = {en} } @misc{Peter1989, author = {Peter, Martin G.}, title = {Chemische Modifikation von Biopolymeren durch Chinone und Chinonmethide}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-16802}, year = {1989}, abstract = {Chinone und Vorstufen, die oxidativ in Chinone und/oder Chinonmethide umgewandelt werden k{\"o}nnen, sind in der Natur weit verbreitet. Als sekund{\"a}re Naturstoffe wirken sie h{\"a}ufig antibiotisch, cytotoxisch, aber auch pathogen, und eine Reihe von Pflanzen und Tieren benutzt chinoide Substanzen als Abwehrstoffe, oft mit spektakul{\"a}rem Erfolg. Auf makromolekularer Ebene spielen Chinonmethide im Pflanzenreich eine Schl{\"u}sselrolle bei der Biosynthese von Lignin, w{\"a}hrend die Bildung von Melanoproteinen ein Beispiel f{\"u}r Reaktionen von o-Chinonen im Tierreich ist. Bei den Insekten dienen Chinone und Chinonmethide zur Bildung des lebensnotwendigen Exoskeletts. Die Reaktivit{\"a}t von Chinonen in biologischen Systemen hat auch f{\"u}r den Menschen unmittelbare Bedeutung in pharmazeutischer, toxikologischer und technologischer Hinsicht. Den Beispielen in diesem Aufsatz liegt ein gemeinsames Prinzip zugrunde, n{\"a}mlich die chemische Modifikation von Biopolymeren durch Chinone und Chinonmethide. Wie sich besonders bei einer detaillierteren Betrachtung der Reaktionen zeigt, die zur Sklerotisierung der Insektencuticula f{\"u}hren, sind in den letzten Jahren wichtige neue Erkenntnisse hinzugekommen, die vor allem durch die modernen Methoden der Stofftrennung und der Festk{\"o}rper-NMR-Spektroskopie erm{\"o}glicht worden sind.}, language = {de} } @misc{Peter1980, author = {Peter, Martin G.}, title = {Products of in vitro oxidation of N-acetyldopamine as possible components in the sclerotization of insect cuticle}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-16759}, year = {1980}, abstract = {[1-14C]-N-Acetyldopamine (NADA) was oxidized in the presence of methyl [3-3H]-β-alanate with mushroom tyrosinase. The complex mixture of reaction products was partly resolved by chromatographic procedures and analyzed by spectroscopic methods. Methyl-β-alanate is incorporated to only a small extent into oxidation products of NADA which inter alia are presumed to be oligomeric hydroxyquinones. After oxidation of [1-14C, 2-3H]-NADA with preparations from tanning Manduca sexta pupal cuticle, N-acetylnoradrenalin was identified as one of the products. Binding of radioactivity to melanin-like material was also observed. These results suggest that oxidation products different from those formulated usually for the crosslinkages between protein amino groups and N-acetyldopaquinone are deposited in darkly brown coloured insect cuticles during sclerotization.}, language = {en} } @article{Peter1995, author = {Peter, Martin G.}, title = {Applications and environmental aspects of chitin and chitosan}, issn = {0022-233X}, year = {1995}, language = {en} } @article{Peter1995, author = {Peter, Martin G.}, title = {The Bio-organic chemistry of melanogenesis}, year = {1995}, language = {en} } @article{Peter1995, author = {Peter, Martin G.}, title = {Chemie i Biochemia Zewnetrznego Szkieletu Owadow : (Chemistry and biochemistry of the insect exoskeleton)}, year = {1995}, language = {en} } @article{Peter1995, author = {Peter, Martin G.}, title = {Chemistry and biochemistry of the insect exoskeleton}, year = {1995}, language = {en} } @article{Peter1995, author = {Peter, Martin G.}, title = {Chitin in den Startl{\"o}chern}, issn = {0009-2959}, year = {1995}, language = {de} }