Results 101 to 110 of about 706 (159)

Prototaxites was an extinct lineage of multicellular terrestrial eukaryotes

Loron CC, Cooper LM, McMahon S, Jordan SF, Gromov AV, Humpage M, Pichevin L, Vondracek H, Alexander R, Dzul ER, Brasier AT, Hetherington AJ.   +11 more
europepmc   +1 more source

Antiviral Activities of Photoactive Perylenequinones

Photochemistry and Photobiology, 1997
AbstractNine perylenequinones (PQ), including some familiar naturally occurring pigments, were compared for their light‐mediated antiviral efficacies. Calphostin C was the most active compound against the two target viruses, herpes simplex virus type 1 and Sindbis virus. Hypo‐crellins A and B were also very active.
J. B. Hudson, V. Imperial, R. Haugland, Z. Diwu   +3 more
exaly   +6 more sources

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Perylenequinones from Curvularia lunata

Biochemical Systematics and Ecology, 2020
Three perylenequinones, the methylated 12-epi-stemphytriol (1), dihydroalterperylenol (2), and alterperylenol (3), were isolated from cultures of Curvularia lunata (LBQM-04) on malt extract broth.
Regina Geris
exaly   +3 more sources

Naturally occurring perylenequinones.

Fortschritte der Chemie organischer Naturstoffe = Progress in the chemistry of organic natural products. Progres dans la chimie des substances organiques naturelles, 1987
Perylenequinones, together with a few compounds containing a partially reduced perylene skeleton, form a relatively small but rapidly increasing group of chemically interesting, biologically active pigments obtainable from natural sources.
U. Weiss, L. Merlini, G. Nasini
semanticscholar   +4 more sources

Biosynthesis of Natural and Unnatural Perylenequinones for Drug Development

ChemMedChem
A wide range of perylenequinones (PQs) with diverse structures and versatile bioactivities have long been isolated, positioning them as highly promising agents for photodynamic therapy (PDT). However, the lack of an efficient and cost‐effective method to
Zengping Su, Yan Zhang, Zhenbo Yuan, Yi-Jian Rao   +3 more
semanticscholar   +3 more sources

Synthetic Biology‐based Construction of Unnatural Perylenequinones with Improved Photodynamic Anticancer Activities

Angewandte Chemie - International Edition
The construction of structural complexity and diversity of natural products is crucial for drug discovery and development. To overcome high dark toxicity and poor photostability of natural photosensitizer perylenequinones (PQs) for photodynamic therapy ...
Yijian Rao
exaly   +2 more sources

Photodynamic Perylenequinones, Photodemethylation and Photooxidation of Dimethylcercosporin

Liebigs Annalen der Chemie, 1992
AbstractRegiospecific photodemethylation of the perylenequinone dimethylcercosporin (DMC0 (2) in methanol involved the two methoxy groups in ortho position to the carbonyl quinone functions, affording 2,11‐dihydroxy‐3,10‐perylenequinone (3) and the dihydrofuran‐containing derivative 4.
Alberto Arnone, Daniela Dal Pio Luogo, Lucio Merlini, Gianluca Nasini   +3 more
core   +3 more sources

Some Synthetic Studies Related to Perylenequinones

Liebigs Annalen Der Chemie, 1993
AbstractTwo closely related routes to dimethyl 3,10‐dihydro‐2,11‐dihydroxy‐4,6,7,9‐tetramethoxy‐3,10‐dioxo‐1,12‐perylenediacetate (10), one involving Ullmann phenol coupling and the other by double oxidative coupling are described. Regioselective demethylation of 10 followed by methylation or vice versa yields dimethyl 3,10‐dihydro‐4,9‐dihydroxy‐2,6,7 ...
Chen Zhao, Xu‐Sheng Zhang, Pang Zhang
exaly   +2 more sources

NMR study of tautomerism in natural perylenequinones

Journal of the Chemical Society, Perkin Transactions 2, 1993
The keto–enol tautomerism of the dihydroxyperylenequinone system of a number of natural compounds, cercosporin 1, isocercosporin 2, phleichrome 3, isophleichrome 4, elsinochromes 5–9, cladochrome C 10, and hypocrellin 11 was studied by 1H, 2H and 13C NMR spectroscopy.
A. Arnone, L. Merlini, R. Mondelli, G. Nasini, E. Ragg, L. Scaglioni, U. Weiss   +6 more
core   +4 more sources

Photophysics, photochemistry, and reactivity: Molecular aspects of perylenequinone reactions

Photochemical & Photobiological Sciences, 2007
Density functional theory (DFT) and time-dependent density functional theory (TD-DFT) were used to elucidate the photochemistry and photophysics of eight different perylenequinones (PQ). The objective of this work has been to quantitatively investigate the photodynamic therapeutic potential of this family of compounds and give an overview of their ...
Rita Cardoso, Guedes, Leif Axel, Eriksson   +1 more
openaire   +3 more sources