The dispersal of pigment centrifugally through the conjunctiva from the site of a repaired traumatic perforation was observed. Iris tissue had been incarcerated in the wound for three days prior to surgical repair. Conjunctival biopsies were examined by light and electron microscopy. Light microscopy revealed a normal, non-pigmented conjunctival epithelium and numerous pigment-laden cells in th...

For the first time, wall paintings of 20th century Russian artists in Bulgaria were analysed by means complementary analytical methods. Representative samples collected from church St. Nicholas Sofia, decorated famous Vasily Perminov, Michail Maletski and Nikolay Shelehov during different periods examined micro-Raman spectroscopy, attenuated total reflectance-Fourier transform infrared (ATR-FTI...

In the eyes of teleosts and amphibians, melanin pigment granules of the retinal pigment epithelium (RPE) migrate in response to changes in light conditions. In the light, pigment granules disperse into the cells' long apical projections, thereby shielding the rod photoreceptor outer segments and reducing their extent of bleach. In darkness, pigment granules aggregate towards the base of the RPE...

1. Two important methods for the study of malarial pigment are described. (a) A method for obtaining a solution of malarial pigment from fixed tissues without the removal of a trace of hemoglobin from the red blood corpuscles. (b) A method for obtaining an iron reaction in malarial pigment. 2. By comparing the bleach reactions and solubility of melanins and malarial pigment, the dissimilarity o...

Although melanin is known for protecting living organisms from harmful physical and chemical factors, its synthesis is rarely observed among endospore-forming Bacillus cereus sensu lato. Here, for the first time, we reported that psychrotolerant Bacillus weihenstephanensis from Northeastern Poland can produce melanin-like pigment. We assessed physicochemical properties of the pigment and the me...