19 results match your criteria element gilded

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Terahertz Time-Domain Reconstruction of Coating Microstratigraphy on Gilded Surfaces.

Materials (Basel) 2019 Nov 21;12(23). Epub 2019 Nov 21.

Istituto di Fisica Applicata "Nello Carrara", Consiglio Nazionale delle Ricerche, v. M. del Piano 10, 50019 Sesto Fiorentino (FI), Italy.

Here, a systematic study in order to assess the potential of THz time domain reflectometry for measuring the thicknesses of overpaint layers applied on original gilded surfaces was carried out. The work is part of a thorough characterization campaign, which is going on at the Rijksmuseum for addressing the conservation problems of a set of 19th century gilded picture frames on which heavy coatings were applied in previous undocumented restoration interventions. To perform such non-invasive thickness measurements, an analytical protocol based on Gaussian fits of the THz pulse-echo temporal profiles was optimized through the preparation of suitable technical samples and the comparison with direct thickness measurements. Read More

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November 2019

Determination of gold leaf thickness using X-ray fluorescence spectrometry: Accuracy comparison using analytical methodology and Monte Carlo simulations.

Appl Radiat Isot 2019 Oct 12;152:6-10. Epub 2019 Jun 12.

LIP - Laboratory for Instrumentation and Experimental Particle Physics, Av. Prof. Gama Pinto, n.2 Complexo Interdisciplinar (3is), 1649-003, Lisboa, Portugal.

In this work, we compared the accuracy of gold leaves thickness determination using X-ray Fluorescence (XRF) setups for different X-ray excitation sources. The sources used consisted on: a) direct Bremsstrahlung from an Amptek Mini-X X-ray tube with Rh target, b) partially monochromatized radiation of the same X-ray tube using combination of Al and Ag filters and, c) monochromatic radiation using secondary target, in a portable setup with triaxial geometry. The performance of the used setups was compared using model samples made with gold foil standard reference materials of known thicknesses (1, 2 and 2. Read More

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October 2019

In situ X-ray fluorescence-based method to differentiate among red ochre pigments and yellow ochre pigments thermally transformed to red pigments of wall paintings from Pompeii.

Anal Bioanal Chem 2017 Jun 7;409(15):3853-3860. Epub 2017 Apr 7.

Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country UPV/EHU, P.O. Box 644, 48080, Bilbao, Spain.

Most of the magnificent wall paintings from the ancient city of Pompeii are decorated with red and yellow colors coming from the ochre pigments used. The thermal impact of the pyroclastic flow from the eruption of Vesuvius, in AD 79, promoted the transformation of some yellow painted areas to red. In this work, original red ochre, original yellow ochre, and transformed yellow ochre (nowadays showing a red color) of wall paintings from Pompeian houses (House of Marcus Lucretius and House of Gilded Cupids) were analyzed by means of a handheld energy-dispersive X-ray fluorescence spectrometer to develop a fast method that allows chemical differentiation of the original red ochre and the transformed yellow ochre. Read More

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Non-invasive quantitative micro-PIXE-RBS/EBS/EBS imaging reveals the lost polychromy and gilding of the Neo-Assyrian ivories from the Louvre collection.

Talanta 2015 May 7;137:100-8. Epub 2015 Feb 7.

Sorbonne Universités UPMC University Paris VI, UMR 8220, Paris, France; Laboratoire d׳Archéologie Moléculaire et Structurale (LAMS), UMR 8220 CNRS UPMC, Paris, France; Rathgen-Forschungslabor, Staatliche Museen zu Berlin, Stiftung Preußischer Kulturbesitz, Berlin, Germany. Electronic address:

Antique objects are known to have been brightly colored. However, the appearance of these objects has changed over time and paint traces are rarely preserved. The surface of ivory objects (8th century B. Read More

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One-step synthesis of collagen hybrid gold nanoparticles and formation on Egyptian-like gold-plated archaeological ivory.

Angew Chem Int Ed Engl 2014 Aug 25;53(32):8363-6. Epub 2014 Jun 25.

Laboratoire de réactivité de surface (LRS), UMR 7197 CNRS, Sorbonne Universités-UPMC University Paris VI, 75005 Paris (France).

A one-step method is reported to synthesize hybrid gold nanoparticles (AuNPs) by reduction of HAuCl4 in acetic solution in the presence of collagen (Col), dicarboxylic acid-terminated polyethylene glycol (PEG), and cetyltetrammonium bromide (CTAB) mixed with hydoxyapatite (HAP) as surfactants. Such formation process of AuNPs was shown to be responsible for purple stains naturally formed on Egyptianizing archaeological gilded ivories from 8th BC Syria. The understanding of this formation mechanism, which most likely involves a step with hybrid AuNPs, allows the establishing of an authenticity marker of ancient gold-plated ivories. Read More

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[Effect of gilding technique on the element release of beryllium ion from Vera Bond titanium alloy].

Sichuan Da Xue Xue Bao Yi Xue Ban 2008 Jul;39(4):638-40

Department of Prosthodontics, West China Stomatological Hospital, Sichuan University, Chengdu 610041, China.

Objective: To research the effect of gilding technique on the element release from Vera Bond Ti alloy exposed to artificial saliva.

Methods: To divided experimental group into 4 groups: common used Ti porcelain crown (controlling group, A1), polished Ti porcelain crown (polished group, A2), gilded Ti porcelain crown (gold-plating group, A3), gilded Ti porcelain crown prolonged 50% (gold-plating prolonged 50% group, A4). T measure the quantity of beryllium ion in artificial saliva after 1 month, 3 months and 6 months by means of ICP-AES. Read More

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Effects of gold coating on experimental implant fixation.

J Biomed Mater Res A 2009 Jan;88(1):274-80

Orthopaedic Research Center, Department of Orthopaedics, Aarhus University Hospital, Noerrebrogade 44, Building 1A, DK-8000 Aarhus C, Denmark.

Insertions of orthopedic implants are traumatic procedures that trigger an inflammatory response. Macrophages have been shown to liberate gold ions from metallic gold. Gold ions are known to act in an antiinflammatory manner by inhibiting cellular NF-kappaB-DNA binding and suppressing I-kappa B-kinase activation. Read More

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January 2009

[Influence of different types of posts and cores on color of IPS-Empress 2 crown].

Hua Xi Kou Qiang Yi Xue Za Zhi 2007 Oct;25(5):450-3

Key Laboratory of Oral Biomedical Engineering of Ministry of Education, Sichuan University, Chengdu, China.

Objective: To evaluate the influence of different types of posts and cores on the final color of the IPS-Emperss 2 crown.

Methods: Five types of posts and cores (Cerapost with Empress cosmo, Cerapost with composite resin, gilded Ni-Cr alloy, gold alloy and Ni-Cr alloy) were made. The shifts in color of three points of IPS-Empress 2 crown surface (cervical, middle and incisal) with different posts and cores was measured with a spectroradiometer (PR-650). Read More

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October 2007

[Effect of gilding technique on the element release of beryllium ion from vera bond Ni-Cr-Be alloy].

Hua Xi Kou Qiang Yi Xue Za Zhi 2007 Feb;25(1):8-11

Dept. of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.

Objective: To evaluate the effect of gilding technique on the element release from Vera Bond Ni-Cr-Be alloy exposed to artificial saliva.

Methods: To measure the quantity of beryllium ion which was released from common used Ni-Cr porcelain crown (controlling group), polished Ni-Cr porcelain crown (polished group), gilded Ni-Cr porcelain crown (gold-plating group) and gilded Ni-Cr porcelain crown prolonged 50% (gold-plating prolonged 50% group) in artificial saliva after 1 month, 3 months and 6 months by means of ICP-AES. So the effect of released beryllium ion with different treatments and the rule of different times with the same treatment were compared. Read More

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February 2007

Who invented 'Avicenna's gilded pills'?

Authors:
Zbigniew Bela

Early Sci Med 2006 ;11(1):1-10

Museum of Pharmacy, Jagiellonian University, Krakow.

This article questions the belief expressed in various histories of pharmacy that the tenth-century Arab physician Avicenna introduced the tradition of coating pills with gold and silver. Although an examination of his Canon documents Avicenna's interest in the medicinal application of gold and silver, no mention is made of coating pills. Nor do other Islamic physicians seem to have been familiar with this practice, any more than such medieval European authors as Arnaldus of Villanova, Raymund Lull or Johannes de Rupescissa. Read More

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February 2007

The NUGGET study: NIR ultra gold-gilded equivalency trial.

Catheter Cardiovasc Interv 2004 May;62(1):18-25

Main Taunus Heart Institute, Bad Soden, Germany.

This study should clarify whether the gold-coated NIROYAL stent is equivalent to the stainless steel NIR stent. Patients were randomized to either NIR stent (n = 298) or a NIROYAL stent (n = 305). The primary endpoint was the minimum lumen diameter of the target lesion at 6 months postprocedure. Read More

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[Infection frequency and type of bacteria after tympanostomy tube drainage in childhood: gilded-silver tubes versus silicone tubes].

HNO 1999 Feb;47(2):107-11

HNO-Klinik, Westfälische Wilhelms-Universität Münster.

Otorrhea is the most common complication after tympanostomy tube insertions. In Germany there are currently two commonly used types of tympanostomy tubes: silicon tubes (ST) and gilded silver tubes (GT). Previously published in vitro studies by Tajima uncovered a positive correlation between the silicon concentration in culture fluid and the rate of growth of Staphylococcus aureus. Read More

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February 1999

Early central andean metalworking from mina perdida, peru

Authors:
Burger Gordon

Science 1998 Nov;282(5391):1108-11

R. L. Burger, Peabody Museum of Natural History and Department of Anthropology, Yale University, Post Office Box 208277, New Haven, CT 06520-8277, USA. E-mail: R. B. Gordon, Department of Geology and Geophysics, Yale Uni.

Copper and gold artifacts in contexts dated to approximately 3120 to 3020 carbon-14 years before the present ( approximately 1410 to 1090 calendar years B.C.) recovered in excavations at Mina Perdida, Lurin Valley, Peru, show that artisans hammered native metals into thin foils, in some cases with intermediate anneals. Read More

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November 1998

Removal of erythrocyte membrane iron in vivo ameliorates the pathobiology of murine thalassemia.

J Clin Invest 1997 Sep;100(6):1459-64

Department of Medicine, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.

Abnormal deposits of free iron are found on the cytoplasmic surface of red blood cell (RBC) membranes in beta-thalassemia. To test the hypothesis that this is of importance to RBC pathobiology, we administered the iron chelator deferiprone (L1) intraperitoneally to beta-thalassemic mice for 4 wk and then studied RBC survival and membrane characteristics. L1 therapy decreased membrane free iron by 50% (P = 0. Read More

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September 1997

Detection, characterization, and bioavailability of membrane-associated iron in the intact sickle red cell.

J Clin Invest 1992 Dec;90(6):2327-32

Department of Medicine, University of Minnesota Medical School, Minneapolis 55455.

It is hypothesized that membrane-associated iron in the sickle red cell is of pathophysiologic importance, but the actual existence of such iron in the intact cell has been questioned. Using a strategy whereby membrane iron can be detected through its bioavailability for catalyzing peroxidation, we used phospholipid exchange protein to load membranes of intact erythrocytes (RBC) with approximately 2% phosphatidylethanolamine hydroperoxide (PEOOH) and monitored the development of peroxidation by-products during subsequent incubation. Normal RBC loaded with PEOOH developed very little peroxidation, but vitamin E-replete sickle RBC showed an exuberant peroxidation response that was not seen in cells loaded with control nonoxidized phosphatidylethanolamine. Read More

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December 1992

Gilded cervico-uterine stem retained for 49 years. A case report.

S Afr Med J 1987 Sep;72(6):431-3

Department of Obstetrics and Gynaecology, University of the Witwatersrand Johannesburg.

Retention of a gilded 'wish-bone' cervico-uterine stem pessary inserted 49 years previously was the unusual cause of postmenopausal bleeding. This device, which is of historical and developmental interest, therefore still has clinical relevance. Read More

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September 1987

[Alteration of gilded molybdenum-wire after implantation in the rabbit skin (author's transl)].

Klin Monbl Augenheilkd 1978 May;172(5):745-7

Changes in gilded molybdenum-wire after implantation in the rabbit skin were investigated by a scanning electron microscope. The described changes are caused by electrolytical action of the tissue fluid. Calcium-molybdat was found between the gold and the molybdenum layer. Read More

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[Clinical observations on the continuing presence of gilded molybdenum-wire in eye tissues (author's transl)].

Klin Monbl Augenheilkd 1977 Nov;171(5):779-81

Gilded molybdenum-wire remains in the sclera and episclera without any reaction of the tissue. Adjacent eye muscles are not involved. In two cases the loops penetrated slowly the sclera and choroid but not the retina. Read More

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November 1977
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