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120 results for “Varnish”
VIRTUAL MUSEUM OF PASTO VARNISH
<p><strong>About the Project</strong></p> <p>The Virtual Museum of Pasto Varnish project seeks to promote the concept of Generative Crafts among the cultural bearers of the artisanal technique of Pasto's Varnish. In this sense, its main objective is to recover the cultural heritage deposited in ancient pieces decorated with the Pasto's varnish technique exhibited in the Colonial Museum of the city of Bogotá (Colombia) during the first half of 2023. Pasto varnish is recognized as Intangible Cultural Heritage of Humanity.</p> <p>This dataset contains the paradata of 22 objects digitized as part of the Intangible Cultural Heritage of the Pasto varnish technique.</p> <p><strong>Project Tasks</strong><br>Task 1:: 3D digitization of objects decorated with the Pasto varnish technique during the exhibition "Mindalas cultural exchanges of Pasto varnish" held at the Colonial Museum in the city of Bogotá, Colombia. Digitized 3D objects: 50.<br>Task 2:: Implement a Virtual Museum of the artisanal Pasto varnish technique with 3D digitized objects for the promotion and dissemination of the technique according to its Special Safeguard Plan. Exposed 3D objects: 22.<br>Task 3:: Create copies of cultural heritage movable through hybrid processes between digital manufacturing and hand-made finishes (generative craft).</p> <p><strong>More Info</strong><br><a href="https://madis.udenar.edu.co/museo-barniz/" target="_blank" rel="noopener">Web Site Virtual Museum of Pasto Varnish</a> <br><a href="https://madis.udenar.edu.co/proyecto-museo-virtual-barniz/" target="_blank" rel="noopener">Blog Virtual Museum of Pasto Varnish</a><br><a href="https://sketchfab.com/MADIS-UDENAR/collections" target="_blank" rel="noopener">Sketchfab </a></p> <p><a href="https://www.spatial.io/s/Museo-Virtual-del-Barniz-65c678af849e3776c719a652?share=4931149729140401975" target="_blank" rel="noopener">Spatial</a> <br><a href="https://osf.io/mekfn/" target="_blank" rel="noopener">OSF Repository</a> </p>
Nonlinear imaging microscopy for assessing structural and photochemical modifications upon laser removal of dammar varnish on photosensitive substrates
<p>Varnish layers are commonly used to protect painted surfaces from atmospheric pollution, oxidation<br> and improve the aesthetic appearance of the artwork by providing an even surface finish, brilliance and<br> depth to the colours. However, the outer varnish layers suffer from progressive deterioration due to<br> aging and the continuous exposure to aggressive environmental conditions, imposing the need of their<br> removal for rectifying the optical and aesthetic properties of the painting and extend its lifetime. The<br> removal of the surface varnish layer, without affecting the painting substrate, comprises a delicate<br> intervention in cultural heritage (CH) conservation.<br> The main objective of this study is to determine by nonlinear imaging microscopy (NLM) the extent of<br> the photochemical damage that could be induced on underlying painting layers by laser removal of<br> varnish protective coatings. This will lead to the identification of the optimal laser cleaning conditions<br> that produce the minimum collateral damage to the painting layers.<br> The current study is undertaken using model samples constituted by bilayers, where the top varnish<br> layer (dammar) coats a bottom layer constituted by a doped synthetic polymer (polymetilmetacrilate,<br> PMMA doped with POPUP) film, the latter mimicking a paint layer. The target is to determine the<br> affected region as a function of depth of the doped polymer layer induced by laser ablation of the<br> varnish. To this aim we use the non destructive NLM imaging modalities of third harmonic generation<br> (THG) and multiphoton excitation fluorescence (MPEF) as novel diagnostic tools and a number of<br> laser conditions for varnish removal, namely different ultraviolet (UV) wavelengths and pulse durations.<br> Characterization of the samples by NLM is complemented by spectroscopic micro-Raman and laser<br> induced fluorescence (one-photon excitation) measurements. These provide a full characterization of<br> the lateral and in-depth chemical and morphological changes following laser removal of the varnish<br> protective layer.</p>
Nonlinear imaging microscopy for assessing structural and photochemical modifications upon laser removal of dammar varnish on photosensitive substrates
<p>The nonlinear optical microscopy (NLM) modalities of Multi-Photon Excited Fluorescence (MPEF) and Third Harmonic Generation (THG) have been combined in this work to characterize as a function of depth with micrometric resolution the type and extent of morphological and photochemical modifications that take place upon ultraviolet (UV) pulsed laser removal of a dammar varnish layer applied on a photosensitive substrate. The latter consists on a layer of the synthetic polymer polymethyl methacrylate doped with a photosensitizer, the aromatic compound 1,4-di[2-(5-phenyloxazolyl)] benzene, that strongly fluoresces upon UV light illumination. A number of laser conditions for partial or total elimination of the varnish coating were explored, namely different wavelengths (266, 248 and 213 nm) and pulse durations, in the nanosecond, picosecond and femtosecond ranges. Changes in the MPEF signals upon laser ablation of the outermost varnish layer successfully signpost photochemical modifications of the varnish or of the photosensitive under-layer, and their dependence with the laser ablation parameters, i.e., wavelength and pulse duration. In turn, THG signals mark the presence of layer boundaries and the reduction by laser ablation of the thickness of the varnish coating. The obtained MPEF and THG data are complemented by morphological observation by optical microscopy and measurements of laser induced fluorescence and micro-Raman spectra of the samples before and after laser ablation at the selected laser irradiation conditions. The results acquired through these nondestructive NLM imaging techniques serve to understand the phenomena that are induced upon laser ablation and to determine the best operating conditions that ensure controlled removal of the varnish with minimal morphological and chemical modifications to the under-layers. This research is of direct application to the UV pulsed laser cleaning of paintings and demonstrates the potential of NLM as a novel assessment tool for non-destructive, on line monitoring of the laser cleaning process.</p>
MSI-MLR_Detail on surface topography and varnish on coffin of Butehamun, RMAH-Brussels-Inv. E.5288
<p>Detail on the coffin of Butehamun (panel of the legs of the left wall), Royal Museums of Art and History, Brussels, Inv. E.5288 (© RMAH). Compilation of MS PLD screenshots (PLD viewer 7.01.04).<br> <strong>a</strong>. General colour view of the investigated area surface with indication of the location of zoom 1; <strong>b</strong>. Zoom 1, demonstrating the ability to measure the surface topography in three dimensions; <strong>c</strong>. Five visualisations of the same area (zoom 2, indicated in Figure 7b) with different underlying normal maps, based on the image datasets made with the five spectral bands in the MS PLD system.</p>
Clinical Efficacy of Chlorhexidine Varnish in Reducing Gingival Hyperplasia, Plaque Accumulation, and White Spot Lesions in Orthodontic Patients
ClinicalTrials.gov study NCT07115784. IPD Sharing: YES. Countries: 1. Publications: 6.
Orthodontic Varnish Microbiology Study
ClinicalTrials.gov study NCT04528134. IPD Sharing: NO. Countries: 1. Publications: 5.
Glass Ionomer Sealant and Fluoride Varnish Study to Prevent Early Childhood Caries
ClinicalTrials.gov study NCT01129440. IPD Sharing: YES. Countries: 1. Publications: 4.
MI Varnish and MI Paste Plus in a Caries Prevention and Remineralization Study
ClinicalTrials.gov study NCT02424097. IPD Sharing: NO. Countries: 1. Publications: 27.
"Comparison of the Effects of Resin Infiltrant, Fluoride Varnish, and the Combined Application of Resin Infiltrant and Fluoride Varnish on Primary Molars in the Treatment of Proximal Non-Cavitated Car
ClinicalTrials.gov study NCT07112963. IPD Sharing: UNDECIDED. Countries: 1. Publications: 2.
In Vivo Comparison of Salivary Fluoride Levels Following the Application of Different 5% NaF Varnishes
ClinicalTrials.gov study NCT01629290. IPD Sharing: NO. Countries: 1. Publications: 1.
Effect of Fluoride Varnish Formulation on the Management of Dentin Hypersensitivity
ClinicalTrials.gov study NCT07286344. IPD Sharing: NO. Countries: 1. Publications: 10.
Fluoride Varnish Randomized Clinical Trial
ClinicalTrials.gov study NCT00066963. IPD Sharing: Not stated. Countries: 1. Publications: 3.
Effectiveness of Bioactive Resin Varnish and Fluoride Containing Xylitol Varnish in Management of Teeth Hypersensitivity
ClinicalTrials.gov study NCT04568473. IPD Sharing: NO. Countries: 1. Publications: 1.
Efficacy Of A PVP-I Fluoride Varnish
ClinicalTrials.gov study NCT03082196. IPD Sharing: NO. Countries: 1. Publications: 2.
Data from: Oral microflora in preschool children attending a fluoride varnish program: a cross-sectional study
Background: To compare the oral microflora in preschool children attending a fluoride varnish program with a reference group receiving a standard oral health program without fluoride varnish applications. A second aim was to relate the microbial composition to the caries prevalence. Methods: Five hundred seven 3-year-old children were enrolled from a cohort of 3403 preschool children taking part in a community based oral health project. Two hundred sixty-three of them had attended caries-preventive program with semi-annual applications of a fluoride varnish since the age of 1 year (test group) while 237 had received standard preventive care (reference group). Oral samples were collected with a sterile swab and analysed with checkerboard DNA-DNA hybridization using 12 pre-determined bacterial probes. Caries and background data were collected from clinical examinations and questionnaires. Results: Gram-positive streptococci (S. intermedius, S. salivarius, S. oralis) were most frequently detected and displayed the highest counts in both groups. There were no significant differences between the groups concerning prevalence of any of the selected bacterial strains except for S. oralis that occurred less frequently in the reference group. In children with caries, V. parvula were significantly more common (p < 0.05) while strains of Lactobacillus, Bifidobacterium and Neisseria were more prevalent among the caries-free children (p < 0.05). Conclusions: A 2-year community program with semi-annual fluoride varnish applications did not seem to significantly influence the oral microflora in preschool children. Trial registration: www.controlled-trials.com (ISRCTN35086887) 20131216 'retrospectively registered'.
FIGURE 5 in Three dominating hypocrealean fungi of the 'white mold spots' on acrylic varnish coatings of the murals in a Koguryo tomb in China
FIGURE 5. Sarocladium kiliense (CGMCC 3.19018). a Colonies on PDA after 14 days, forward (left), reverse (right). b–e Conidiophores with conidia f–i. Conidiogenous cells. j–m Conidia. Scale bars: b–d= 20 μm; e–i= 10 μm; k–m = 5 μm.
FIGURE 2 in Three dominating hypocrealean fungi of the 'white mold spots' on acrylic varnish coatings of the murals in a Koguryo tomb in China
FIGURE 2. Phylogeny of Hypocreales based on a combination of ITS and LSU sequence data. Xylaria hypoxylon, Xylaria arbuscula, and Xylaria polymorpha are selected as outgroup taxa. Bayesian posterior probabilities greater than 0.95 are indicated (BYPP) (left). Bootstrap values higher than 75% from RAxML (MLBS) (right) are given above the nodes. Asterisks indicate bootstrap values less than 50% or Bayesian posterior probability values lower than 0.95. T indicates ex-living type. NT indicates new ex-living type. Our taxa are in red font.
FIGURE 4 in Three dominating hypocrealean fungi of the 'white mold spots' on acrylic varnish coatings of the murals in a Koguryo tomb in China
FIGURE 4. Leptobacillium muralicola (HMAS 247818, holotype). a Colonies on PDA after 14 days, forward (left), reverse (right). b Mycelia. c, f Conidiophores with conidia. d, e. Conidiogenous cells. g, h. Conidia in chain. i–k Conidia. Scale bars: b = 1 cm; c = 100 μm; d–i = 10 μm; j, k = 5 μm.
FIGURE 3 in Three dominating hypocrealean fungi of the 'white mold spots' on acrylic varnish coatings of the murals in a Koguryo tomb in China
FIGURE 3. Acremonium camptosporum (CGMCC 3.19017) a Colonies on PDA after 14 days, forward (left), reverse (right). b–e Conidiophores with conidia. f–i Conidiogenous cells. j–m Conidia. Scale bars: b–h = 10 μm; i–m = 5 μm.
FIGURE 1 in Three dominating hypocrealean fungi of the 'white mold spots' on acrylic varnish coatings of the murals in a Koguryo tomb in China
FIGURE 1. 'Moldy spots' on the mural surface (A) and pattern of fungal taxa of 'moldy spots' in order level (B). Phylogenetic analyses.
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