scholarly journals Kazimir Malevich’s composition «The lady and the piano»: a question of pigment layer and attribution research

2018 ◽  
Vol 18 (3) ◽  
pp. 80-83
Author(s):  
M. Moskalyuk ◽  
T. Tolstikhina
Keyword(s):  
Pigment Layer

scholarly journals Urrets-Zavalia syndrome after deep anterior lamellar keratoplasty

2016 ◽  
Vol 73 (10) ◽  
pp. 973-975
Author(s):  
Vesna Jovanovic ◽  
Ljubisa Nikolic
Keyword(s):  
Case Report ◽  
Penetrating Keratoplasty ◽  
Secondary Glaucoma ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Pigment Layer ◽  
Anterior Lamellar Keratoplasty ◽  
Corneal Hydrops ◽  
Iris Atrophy ◽  
Uncommon Complication

Introduction. Urrets-Zavalia syndrome is an uncommon complication of the deep anterior lamellar keratoplasty in keratoconus. The manifestations of this syndrome are an irreversible mydriasis, iris atrophy and secondary glaucoma. Case report. Deep anterior lamellar keratoplasty was done for keratoconus with a presumably healed corneal hydrops in a 21-year-old Caucasian man. The graft remained clear, but the surgery was complicated by a fixed, dilated pupil, patches of iris atrophy, ectropium of the iris pigment layer and glaukomflecken in the lens. Conclusion. Although safer than penetrating keratoplasty, the deep anterior lamellar by not trying to secure an unhealed Descemet?s membrane with air. Instead, a new Descemet?s membrane transplanted within a penetrating graft is a safer choice.

An Immunological Approach to the Problem of Lens Regeneration

Development ◽  
1959 ◽  
Vol 7 (4) ◽  
pp. 549-555
Author(s):  
J. Langman ◽  
B. D. Prescott
Keyword(s):  
Posterior Wall ◽  
Dorsal Part ◽  
Pigment Layer ◽  
Lens Regeneration ◽  
Immunological Approach

Lens regeneration from the dorsal rim of the iris has been observed after removal of the original lens in many species of the genus Triturus (Stone, 1952, 1954, 1958; Zalokar, 1944; Reyer, 1954). Transformation of the iris cells into lens starts with depigmentation and is followed by multiplication of the cells, which become arranged into a vesicle. Subsequently the cells in the posterior wall of the vesicle differentiate into lens fibres and, finally, a new lens is formed. Similarly in the chick (Van Deth, 1939, 1940) removal of the lens primordium from a 53-hour embryo and explantation of the eye-cup resulted in formation of a small lens from both iris epithelium and pigment layer of the retina. However, in the chick the lens-forming potency of the iris was not limited to the dorsal part, but extended also to the ventral rim.

Preliminary study of a Georgia O'Keeffe pastel drawing using XRF and μXRD

2009 ◽  
Vol 24 (2) ◽  
pp. 116-123 ◽  
Author(s):  
Lynn B. Brostoff ◽  
Catherine I. Maynor ◽  
Robert J. Speakman
Keyword(s):  
Lead Oxide ◽  
X Ray Diffraction ◽  
Pigment Layer ◽  
X Ray ◽  
Georgia O'keeffe ◽  
Red Lead ◽  
Lead Oxides ◽  
Preliminary Study ◽  
Yellow Pigments ◽  
Xrf Analyses

X-ray fluorescence spectrometry (XRF) and micro-X-ray diffraction (μXRD) were used to analyze the composition of pigments on a pastel drawing, Special No. 32, by Georgia O’Keeffe. XRF analyses showed that, among other pigments present in the drawing, the red, orange, and yellow pigments may possibly be identified with lead- and chromium-based pigments: lead chromates, red and yellow lead oxides, and/or lead carbonates, plus calcium-based pastel fillers, such as whiting or gypsum. XRD examination of a sample removed from a dark mottled area of coral red pastel confirmed that this pigment layer, which is associated with a darkened appearance and high Pb:Cr ratios, matches the red lead oxide, minium (2PbO⋅PbO2).

scholarly journals ToF-SIMS and AFM Characterization of Brown Cosmetic Contact Lenses: From Structural Analysis to the Identification of Pigments

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Seon Hee Kim ◽  
Jihye Lee ◽  
Yun Jung Jang ◽  
Kang-Bong Lee ◽  
Yeonhee Lee
Keyword(s):  
Secondary Ion Mass Spectrometry ◽  
Contact Lenses ◽  
Analytical Techniques ◽  
Pigment Layer ◽  
Force Microscopy ◽  
Soft Contact Lenses ◽  
Atomic Force ◽  
Tof Sims ◽  
The Cross ◽  
Specific Fragment

Over the years, soft contact lenses for vision correction and cosmetic and therapeutic purposes have been greatly improved. For cosmetic contact lenses, the pigments need to be nontoxic, and the position of the pigment layer is particularly important because of the risks posed by pigment elution and the roughness of the lens surface. In this paper, we characterized the properties of brown cosmetic contact lenses made by three different manufacturers using surface analytical techniques. The surface topographies of the noncolored and colored parts were obtained by atomic force microscopy (AFM), and the position and composition of the pigment layer were determined by analyzing the cross section of the contact lenses using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). The influence of pigment location on surface roughness was also examined. In addition, to find the method of the evaluation for the risk of surface elution of the pigments in the colored parts, the mass spectra and ion images of the surfaces were obtained by time-of-flight secondary ion mass spectrometry (ToF-SIMS) with a new sample preparation. From the ToF-SIMS spectra, we observed specific fragment ions of the poly(hydroxyethyl methacrylate) (PHEMA) polymer and found differences in the composition of the pigment layer depending on the manufacturers. The cross-sectioned image and 3D chemical characterizations of metallic and specific ions in the brown cosmetic contact lenses clearly indicated the spatial distribution and location of the pigment layer that can be used for the evaluation of pigment elution.

scholarly journals Microstructure of Red Pigment Layer Painted on the Takamatsuzuka Tumulus Wall

2015 ◽  
Vol 79 (2) ◽  
pp. 64-70 ◽  
Author(s):  
Masahiro Kitada ◽  
Yohsei Kohzuma ◽  
Takayasu Koezuka ◽  
Toru Tateishi
Keyword(s):  
Red Pigment ◽  
Pigment Layer

scholarly journals Study of Archeometric Characteristics of a Panel Painted Icon Form XIXth Century

2013 ◽  
Vol 21 (2) ◽  
pp. 71-82 ◽  
Author(s):  
Raluca A. Cristache ◽  
Ion Sandu ◽  
Viorica Vasilache ◽  
Oana Cristache
Keyword(s):  
Physicochemical Analysis ◽  
Wood Panel ◽  
Pigment Layer ◽  
X Ray ◽  
Painting Materials ◽  
Ultramarine Blue ◽  
Xixth Century ◽  
The Right ◽  
Painting Layer ◽  
Scanning Electron

Abstract This study presents a physicochemical analysis on the orthodox icon “The grieving Mother” from XIXth century. The icon is made by an anonymus painter, in tempera pigments, on a lime wood support, Tillia cordata. God’s Mother is represented from one side, only the bust, with the head down, framed by a white border. The predominant colors of the icon are ultramarine blue, ocher, red-brown, with silver leaf. The edges of the panel were painted with tempera pigments as the border. On the right edge an inscription in blue ink, can be seen, but is unreadable. The painting layer has gaps, fissures, detachments, dirt, degraded and scaly varnish. The panel is made from a single board, transversally cut, without crossbeams. The study is based on the identification of some archeometric characteristics of the wood panel and of the pigment layer. To determin painting materials and the conservation state, Fourier Transform Infrared Spectroscopy (Micro-FTIR) and Scanning Electron Microscope coupled with Energy Dispersive X-ray spectroscopy (SEM-EDX) were employed. Using this methods we identify the pigments used and the state of degradation of the panel. The FTIR spectrum analysis showed that the pigment layer contains schellac varnish, ultramarine blue and dust, a conclusion supported by SEM-EDX analysis.

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