Microspectrophotometrically derived difference spectra from the barnacles Balanus amphitrite and B. eburneus show that a blue illumination after an orange illumination causes a decrease in absorption in the blue region and an increase in absorption in the green-yellow region, with an isosbestic point around 535 nm. Orange-following-blue illumination causes the reverse changes. The dark time bet...

As far as is known, the pigment Prussian blue was synthesised for the first time in Berlin in the early 1700s. It is commonly assumed that the pigment was not used in paintings before the 1720s. The presence or absence of this pigment is often used to answer questions concerning the dating and authenticity of art objects from the 18th Century. For the very first time, a large collection of Fren...

Abstract Balanced levels of macronutrients and sucrose may ensure the success micropropagation endangered ones. This study aimed to evaluate effect salts in culture medium on vitro Lomatozona artemisiifolia, as well determine influence light emitting diode (LED) shoot proliferation rooting species. Nodal segments were used different macronutrient concentrations MS (25, 50 100%), (0.0 mM; 0.34 0...

PURPOSE The aim of this study was to establish a model for morphologic retinal reconstruction after destruction of photoreceptors. METHODS Rat embryos were prelabeled by injection of bromodeoxyuridine (BrdU) into timed pregnant rats on 2 to 6 consecutive days. Pieces of fetal retinas (embryonic day [E] 17 to E22) were embedded in growth factor-reduced matrigel for protection and stored in med...

Pseudanabaena limnetica, the cyanophycean microalga, like other members of Cyanophycea, is an excellent source pigments such as phycocyanin, proteins, carotenoids and polysaccharides. These strains also form a large proportion algal biomass. The P.limnetica strain can grow in extreme environmental conditions it grows well SW-BG 11 medium under laboratory conditions. In present investigation, th...

PURPOSE Orange pigment is an important sign of malignancy in melanocytic tumors. There is a question as to whether the pigment accumulation is inside of macrophages or retinal pigment epithelial (RPE) cells. We investigated which cells are involved with this color alteration. METHODS We examined enucleated specimens from two patients with choroidal melanoma and dense orange pigment on fundus ...

The exact color of light absorbed by chlorophyll (Chl) pigments, the light-harvesters in photosynthesis, is tuned by the protein microenvironment, but without knowledge of the intrinsic color of Chl it remains unclear how large this effect is. Experimental first absorption energies of Chl a and b isolated in vacuo and tagged with quaternary ammonium cations are reported. The energies are largel...

The modulation of pigment level is an essential adaptation response that allows photosynthetic organisms to adjust light harvesting to ambient conditions and to avoid oxidative damage caused by excess absorbed light (1,2). Cyanobacteria possess a macromolecu-lar pigment complex termed phyco-bilisome, which harvests light energy and transfers it to the photosynthetic reaction center (3). This ul...

This work deals with the composition of the blue and green pigments used in the wooden sarcophagus studied by Abdelaal et al. and published in 2014 in this journal. From the published data, a degradation of the originally used Egyptian blue pigment is proposed. The presence of chlorine in the pigment deduced from SEM-EDS analyses and the greenish hue observed point to the formation of a certain...