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Carmichael’s Concise Review


Coming Events 2018


EBSD 2018 - Electron Backscatter Diffraction Conference May 23–25, 2018 Ann Arbor, MI


www.microbeamanalysis.org/topical-conferences/ ebsd-2018


Cell Symposium: Multifaceted Mitochondria June 4–6, 2018 San Diego, CA


www.cell-symposia.com/mitochondria-2018


Atom Probe Tomography and Microscopy June 10–15, 2018 Gaithersburg, MD


www.nist.gov/news-events/events/2018/06/ atom-probe-tomography-and-microscopy-2018-aptm-2018


Inter/Micro 2018 June 11–15, 2018 Chicago, IL


www.mcri.org/v/101/InterMicro


EXRS2018 - European Conference on X-Ray Spectrometry June 24–29, 2018


Ljubljana, Slovenia https://exrs2018.ijs.si


Society for Ultrastructural Pathology Meeting (Ultrapath XIX) June 24–29, 2018


Newport, RI www.ultrapath.org


EMAG 2018: Applications of Electron Microscopy to Beam Sensitive Material July 4–6, 2018 Warwick, UK


http://emag2018.iopconfs.org/home


Microscopy & Microanalysis 2018 August 5–9, 2018


Baltimore, MD www.microscopy.org 2019


Microscopy & Microanalysis 2019 August 4–8, 2019


Portland, OR www.microscopy.org 2020


Microscopy & Microanalysis 2020 August 2–6, 2020


Milwaukee, WI www.microscopy.org 2021


Microscopy & Microanalysis 2021 August 1–5, 2021


Pittsburgh, PA www.microscopy.org 2022


Microscopy & Microanalysis 2022 July 31–August 4, 2022


Portland, OR www.microscopy.org 2023


Microscopy & Microanalysis 2023 July 24–28, 2023


Minneapolis, MN www.microscopy.org


More Meetings and Courses Check the complete calendar near the back of this magazine.


8


Figure 1 : Male rainbow peacock spider M. robinsoni . (a) SEM image of iridescent scales (white arrowhead) and black scales (black arrowhead). Scale bar = 200 μ m. (b) SEM image showing periodic grating structures on the surfaces of the iridescent scales. Scale bar = 5 μ m. (c) TEM image showing regular binary-phase surface gratings on the surface of a scale with an airfoil profi le. Scale bar = 5 μ m. (d) Visible light image showing that each iridescent scale (about 40 μ m × 10 μ m) hosts two microscopic rainbows (center black square is 4 μ m × 4 μ m). Images courtesy of Bor-Kai Hsiung.


doi: 10.1017/S1551929518000494 2018 May


Color produced by wavelength-dependent light scattering is a key component of visual communication in nature and plays a particularly important role in visual signaling by structurally colored animals during courtship. This is true in the avian peacock and its namesake, the male rainbow peacock spider. Maratus is a spider genus of the family Salticidae (jumping spiders), which are commonly referred to as peacock spiders. Recently an international, multi-disciplinary team headed by Bor-Kai Hsiung [1] used scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to determine what is responsible for the rainbow- hued visible light signal from two species of these spiders, M. robinsoni and M. chrysomelas .


Both species have two types of visually distinct abdominal scales: rainbow- iridescent scales and velvet black scales. SEM revealed that the black scales are brush-like and randomly oriented, whereas the iridescent scales are aligned in a more orderly fashion ( Figure 1a ). At higher magnification, SEM showed the


Would You Expect to Find the Smallest Natural Rainbow on a Spider?


Stephen W. Carmichael Mayo Clinic , Rochester , MN 55905


carmichael.stephen@mayo.edu


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