Background: Melanin is a negative charge hydrophobic complex pigment. Melanin is produced naturally in bacteria to protect them against UV, free radicals and environmental stresses. Pigment production in bacteria has more advantages than other biosources due to its rapid growth, higher efficiency and easier extraction. The aim of this study was the isolation, biochemical and molecular identific...

statement of problem: physiologic pigmentation of oral mucosa is considered as a prevalent entity among black people and those having relatively dark skin. gingival physiologic pigmentation may cause problems for some patients specially ladies as far as esthetics is concerned. to overcome the issue, the surgery might be suggested which can cause some problems due to its side effects. cryotherap...

Background: Sulfur mustard gas is a chemical agent that has been used in many wars, especially in Iran-Iraq war. This chemical agent affects many organs including lungs, eyes and skin, causing numerous acute and chronic lesions including erythema and hyperpigmentation, respectively. This study was conducted to evaluate erythema and melanin in subjects with a history of exposure to sulfur ...

to characterize the distribution of melanin producing medicago-nodulating rhizobia in western and north-western of iran, 982 sinorhizobium isolates were trapped from a combination of three alfalfa populations (hamedani, nikshahri, kodi) and soil samples from eight sites across kurdestan, kermanshah, eastern azarbayjan and lorestan provinces. all rhizobial isolates were examined for their abilit...

A review is presented of the seven commonest types colour aberrations in birds together with suggestions for a standardised universal nomenclature to identify and distinguish these aberrations. These are: Leucism (congenital absence melanin-producing cells), Progressive Greying (progressive loss Albino (total melanin due lack key enzyme), Brown (incompletely coloured melanin), Ino (even less co...

background bacillus thuringiensis is the most successful biological control agent used in agriculture, forestry and mosquito control. however, the insecticidal activity of the b. thuringiensis formulation is not very stable and rapidly loses its biological activity under field conditions, due to the ultraviolet radiation in sunlight. melanin is known to absorb radiation therefore photo protecti...

Melanin plays an indispensable role in the human body. It serves as a biological reducer for the green synthesis of precious metal nanoparticles. Melanin-Ag nanocomposites were successfully produced which exhibited very strong surface-enhanced Raman scattering (SERS) effect because of the reducibility property of melanin. A melanin-Ag composite structure was synthesized in situ in melanin cells...