Photo-oxidative stability of a series of most common red acrylic paints has been investigated. The paints in question were carmine, quinacridone scarlet, alizarin crimson, brilliant red, vermilion and cadmium red hue. Structural changes, discoloration and weight loss of paints film subjected to UV irradiation in an accelerated ageing chamber were measured using FT-IR spectroscopy, colorimetry a...

The complex pigment pattern of fly agaric (Amanita muscaria) cap skins has been studied by LC-DAD and mass spectrometry. Among the betaxanthins the corresponding derivatives of serine, threonine, ethanolamine, alanine, Dopa, phenylalanine and tryptophan are reported for the first time to contribute to the pigment pattern of fly agarics. Betalamic acid, the chromophoric precursor of betaxanthins...

The red-most fluorescence emission of photosystem I (733 nm at 4 K) is associated with the Lhca4 subunit of the antenna complex. It has been proposed that this unique spectral feature originates from the low energy absorption band of an excitonic interaction involving chlorophyll A5 and a second chlorophyll a molecule, probably B5 (Morosinotto, T., Breton, J., Bassi, R., and Croce, R. (2003) J....

N the investigation of pigmentation among the lozenge series of pseudoalleles I in Drosophila melanogaster, the amount and distribution of red and brown pigments in the compound eyes of the lozenge mutants can be analyzed histologically by studying the genic effect on the two pigments separately. In an earlier report (CLAYTON 1957), the distribution of pigment in males of the lozenge mutants wa...

Phenazines are redox-active small molecules that play significant roles in the interactions between pseudomonads and diverse eukaryotes, including fungi. When Pseudomonas aeruginosa and Candida albicans were cocultured on solid medium, a red pigmentation developed that was dependent on P. aeruginosa phenazine biosynthetic genes. Through a genetic screen in combination with biochemical experimen...

An air-membrane surface (AMS) bioreactor was designed to allow bacteria to grow attached to a surface as a biofilm in contact with air. When Bacillus licheniformis strain EI-34-6, isolated from the surface of a marine alga, was grown in this reactor, cells produced antimicrobial compounds which they did not produce when they were grown in shake flask cultures. An unidentified red pigment was al...

Sexually selected colors in animals can be created by multiple pigments (e.g., carotenoids, melanins, pterins), but how these pigment classes interact to generate intraspecific color variation has rarely been tested, especially in reptiles. We examined full-spectrum color variation as well as pterin (i.e., drosopterin) and carotenoid (i.e., xanthophyll) pigment concentrations in the yellow and ...

M YOGLOBIN is a herne-prot.eiii involved in the transfer of oxygen to the muscle tissues. Its molecular weight is about one-fourth that of hemoglobin.’ It has only one heme(protoporphyrin-Fe) group attached to its protein moiety, in contrast to the four present in hemoglobin.2 tfhe protein part of myoglobin is not identical with the globin of the red cell pigment. Terminal amino group determina...