气候变化领域集成服务门户(CCPortal): Conservation, preparation and imaging of diverse ambers and their inclusions

CCPortal

DOI	10.1016/j.earscirev.2021.103653
	Conservation, preparation and imaging of diverse ambers and their inclusions
	Sadowski E.-M.; Schmidt A.R.; Seyfullah L.J.; Solórzano-Kraemer M.M.; Neumann C.; Perrichot V.; Hamann C.; Milke R.; Nascimbene P.C.
发表日期	2021
ISSN	00128252
卷号	220
英文摘要	Amber, a natural polymer, is fossil tree resin derived from diverse botanical sources with varying chemical compositions. As such, all amber is susceptible to the effects of light, temperature, relative humidity, and oxygen, as well as exposure to certain chemicals, and will deteriorate over time in collections if left unprotected. Here we review approaches for the conservation, preparation, and imaging of amber specimens and their inclusions, and address indications and causes of amber degradation, as well as recommendations for a suitable storage environment. We also provide updated preparation and embedding protocols, discuss several techniques for imaging inclusions, and address digitization efforts. A stable storage environment is essential to mitigate or avoid deterioration of amber, which often manifests as crazing, spalling, breaking and colour changes. Based on previous conservation studies of fossil resins, we generally recommend storage in a climate-monitored environment with a relative humidity of ca. 50%, 18 °C, and stress that light exposure must be kept to a minimum. For stabilization and anoxic sealing, amber specimens should ideally be embedded in an artificial epoxide resin (EpoTek 301-2 or similar is currently recommended). Amber should not be treated with or stored in vegetable or mineral oils (even for a short time for examination or photography), or come into contact with alcohol, disinfecting agents, hydrogen peroxide, or other destructive solvents or mixtures, since any of these materials can irreversibly damage the amber. Most photography of inclusions for research and digitization purposes can be successfully accomplished using light microscopy. Scanning electron microscopy (SEM) is sometimes used to uncover fine details, but is an invasive method. However, X-ray based methods (utilizing micro computed tomography, or micro-CT) are becoming more frequently used and increasingly indispensable in the examination of minute internal structures of inclusions, and to fully visualize important structures in opaque amber. Micro-CT makes it possible to digitize an inclusion three-dimensionally, and thus enables digital specimen ‘loans’. Light microscopal images are still widely used in the digitization of amber specimens and are an essential alternative to micro-CT imaging when resources or time are limited. Overall, due to the vulnerability of all fossil resins, we recommend that conservation of amber samples and their inclusions be prioritized. © 2021 The Authors
关键词	Amber Amberization Deterioration Diagenesis Digitization Epoxy embedding Fossil tree resins Museum collections Pyrite disease Storage environment
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204127
作者单位	Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, Berlin, 10115, Germany; Department of Geobiology, University of Göttingen, Goldschmidtstraße 3, Göttingen, 37077, Germany; Department of Palaeontology, University of Vienna, Althanstraße 14, Vienna, 1090, Austria; Palaeontology and Historical Geology, Senckenberg Research Institute, Senckenberganlage 25, Frankfurt am Main, 60325, Germany; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 263 avenue du Général Leclerc, Rennes, 35000, France; Institute of Geological Sciences, Freie Universität Berlin, Malteserstraße 74-100, Berlin, 12249, Germany; Division of Invertebrate Zoology, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, United States
推荐引用方式 GB/T 7714	Sadowski E.-M.,Schmidt A.R.,Seyfullah L.J.,et al. Conservation, preparation and imaging of diverse ambers and their inclusions[J],2021,220.
APA	Sadowski E.-M..,Schmidt A.R..,Seyfullah L.J..,Solórzano-Kraemer M.M..,Neumann C..,...&Nascimbene P.C..(2021).Conservation, preparation and imaging of diverse ambers and their inclusions.Earth Science Reviews,220.
MLA	Sadowski E.-M.,et al."Conservation, preparation and imaging of diverse ambers and their inclusions".Earth Science Reviews 220(2021).