Results 261 to 270 of about 128,823 (315)

Identification of Photoreceptor Pigments

2010
Rhodopsin, flavins, pterins and carotenoids are pigments that have been identified as participating in the photoreception and photomovement of eukaryotic algae [Lenci, 1975, 1995; Haupt and Hader, 1994; Kreimer, 1994; Lebert, 2001; Siebert, 2003]. Rhodopsin represents a protein (opsin), lipid and chromophore (retinal) complex.
Yuriy I. Posudin, Nadiya P. Massjuk, Galyna G. Lilitskaya   +2 more
openaire   +1 more source

Identification of titanium pigment in drug addicts' tissues

Histopathology, 1991
Autopsy on two drug addicts who had been injecting themselves intravenously with crushed Algafan tablets (active principle, propoxyphene hydrochloride) showed crystals consistent with talc in their lungs and other organs. A fine granular material that appeared black by transmitted light was also present.
J C, Coelho Filho, R A, Moreira, P R, Crocker, D A, Levison, B, Corrin   +4 more
openaire   +2 more sources

Isolation and Identification of the Urinary Pigment Uroerythrin

European Journal of Biochemistry, 1975
The red pigment uroerythrin, a chromophore known to be adsorbed by the amorphous urate sediments (sedimentum lateritium), has been isolated from human urine and further purified as its trimethyl derivative.Urine was applied to a column of Amberlite XAD‐2 resin on which uroerythrin and other pigments were adsorbed. The pigments were eluted with methanol
J, Berüter, J P, Colombo, U P, Schlunegger   +2 more
openaire   +2 more sources

Identification of Oxysterols in Human Bile and Pigment Gallstones

Gastroenterology, 2001
Although cholesterol is the most abundant sterol in animal tissues, oxidized products of cholesterol (oxysterols) also occur in mammalian organs and blood and are cytotoxic, atherogenic, and carcinogenic. However, the presence of oxysterols in bile or gallstones has never been reported.Fresh human bile and gallstones were collected.
Lee, SP, Haigh, WGeoffrey
openaire   +3 more sources

IDENTIFICATION OF MALIGNANT POTENTIALITIES OF MELANOCYTIC (PIGMENTED) NEVUS

Journal of the American Medical Association, 1956
• An attempt is made to state the clinical features by which the physician can decide whether a common pigmented mole, appropriately designated as a melanocytic nevus, should be removed. At the junction or interface between epidermis and dermis lie the melanocytes whose multiplication and extrusion into the dermis is called junctional activity ...
openaire   +2 more sources

A rapid pigmentation test for identification ofCryptococcus neoformans

Antonie van Leeuwenhoek, 1978
A rapid pigmentation test for identification of Cryptococcus neoformans is described. The method is based on the formation of a characteristic, mouse-grey to violaceous-black pigment when shake cultures of C. neoformans in a phosphate-buffered, l-DOPA - ferric citrate medium are incubated at 37 C for one hour.
D K, Paliwal, H S, Randhawa
openaire   +2 more sources

Identification of organic pigments by solution spectrophotometry

Color Research & Application, 1982
AbstractOrganic pigments can be extracted readily into organic solvents from paints, plastics, inks, and other colored samples. If visible (in some cases near‐infrared) wave‐length spectrophotometric data are obtained from the resulting solutions using a log‐absorbance presentation, the pigments can be identified by matching curve shapes to those in a ...
Fred W. Billmeyer, Max Saltzman, Romesh Kumar   +2 more
openaire   +1 more source

Algorithms for Pigment Identification

2000
In the study of pigments in art works, we want to identify which pigments were mixed by the artists. The technique used is the Raman spectroscopy. We designed a specific database and we developed some algorithms for processing and understanding the original ...
openaire   +1 more source

DARK BROWN AMNIOTIC FLUID—IDENTIFICATION OF CONTRIBUTING PIGMENTS

BJOG: An International Journal of Obstetrics & Gynaecology, 1981
SummaryA total of 208 second trimester amniotic fluid samples were examined visually and spectrophotometrically for pigmentation. Of these, 15 samples had dark brown colouration. Fourteen of the 15 samples had chemically detectable haemoglobin derived pigments and one had meconium only.
openaire   +2 more sources

Raman microscopy of Greek icons: identification of unusual pigments

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2003
Five Greek icons, made between the 15th and 18th centuries and now belonging to the Victoria and Albert Museum collections, were analysed by energy-dispersive X-ray fluorescence (EDXRF), optical microscopy and Raman microscopy in order to determine the stratigraphy of the artworks and the identity of the pigments used.
Lucia, Burgio, Robin J H, Clark, Krini, Theodoraki   +2 more
openaire   +2 more sources