In addition to canthaxanthin, seven pigment fractions were isolated from Micrococcus roseus. They were purified by solvent partitioning and by column and thin-layer chromatography. Visible absorption spectra, chromatographic behavior, and partition coefficients of the pigments and derivatives prepared from the pigments were used in characterizing them. Both alpha- and beta-carotene derivatives ...

The chicken retina contains rhodopsin (a rod visual pigment) and four kinds of cone visual pigments. The primary structures of chicken red (iodopsin) and rhodopsin have been determined previously. Here we report isolation of three cDNA clones encoding additional pigments from a chicken retinal cDNA library. Based on the partial amino acid sequences of the purified chicken visual pigments togeth...

The aim of this work is not only the synthesis of black ceramic pigment with spinel structure using local and inexpensive minerals (chromite and manganese ores) but also throw some light on the relations between the structure and the colour of obtained pigment. Ultimate utilization spinel solid solution in ceramic materials is mostly due to their structure characteristics, their thermal and che...

among the ways of pigment production, microbial synthesis has gained more interest for high growth rate, easy extraction and high yield. pigments are used in the food industry as natural colorants and preservatives; they also have pharmaceutical applications. in this study, fungus monascus purpureus ptcc 5303 was used to produce red, orange and yellow pigments. at first, significant variables w...

The methanolic extract of the cyanobacterium (blue-green alga) Spirulina geitleri has been treated with methanolic acid to convert all chlorophyllous pigments to their methylpheophorbides. Fractionation of the latter from methylpheophorbide a by thin layer chromatography and high pressure liquid chromatography yielded methylpheophorbide-RCI. Its structure has been determined as 13’shydroxy-20-c...

Cosmetic Science Technology 2010 1 Abstract Borosilicate pigments represent a new variety in the wellknown class of pearlescent pigments. Consisting of transparent borosilicate flakes coated with high refractive metal oxides, e.g. titanium dioxide or iron oxides, these innovative pigments allow the achievement of optimum interference effects in combination with outstanding transparency. Borosil...

Iron oxide microtubules produced by a species of iron-oxidizing bacteria, Leptothrix ochracea, have been expected to be useed as unique multifunctional materials such as catalysts scaffolds, pigments, and magnetic materials. However, their structural characteristics and formation mechanism are still ambiguous. The detailed features of the microtubules were characterized through electron microsc...

Summarv TeJ pigments, the oxidative products of tea polyphenols. mainly contain [eJ theJt1a\'ins. thearubigins and other components. In short-renn screening studies. tea pigments \vas found to have significant inhibitory efffects in Gene mutation test. Micronuclei fonnation test. rvletabolic cooperation test. \ilice ear edema test. Viability and growth ability of Hela cells in soft agar and S-1...

The spectral sensitivities of the X-encoded pigments in dichromats were studied using the electroretinogram. The action spectra measured for these subjects correspond to four distinctly different X-encoded visual pigments, two different middle-wave pigments spectrally separated by 7 nm and two different long-wave pigments separated by 5 nm. Amino acid sequences were deduced from examination of ...