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Carmichael’s Concise Review


Coming Events 2015


Frontiers in Light Microscopy Symposium November 17, 2015


National Institutes of Health, Bethesda, MD https://ncifrederick.cancer.gov/events/ LightMicroscopy


2015 MRS Fall Meeting & Exhibition November 29–December 4, 2015 Boston, MA


Sponsor: Materials Research Society (MRS) www.mrs.org/fall2015


American Society for Cell Biology (ASCB)


2015 Annual Meeting December 12–16, 2015 San Diego, CA


http://ascb.org/future-ascb-annual-meetings 2016


Physics and Chemistry of Semiconductor


Surfaces and Interfaces (PCSI-43) January 17–21, 2016 Location: Palm Springs, CA www.pcsiconference.org


24th Australian Conference on


Microscopy and Microanalysis January 31–February 4, 2016 Melbourne, Australia www.acmm2016.org


Nanoscience and Nanotechnology


(ICONN) 2016 February 7–11, 2016 Canberra, Australia www.ausnano.net/iconn2016


60th Annual Meeting, Biophysical Society February 27–March 2, 2016 Los Angeles, CA


www.biophysics.org/Meetings/AnnualMeeting/ tabid/85/Default.aspx


PITTCON Conference March 6–10, 2016 Atlanta, GA


http://pittcon.org


2016 MRS Spring Meeting March 28–April 1, 2016 Phoenix, AZ


www.mrs.org/spring2016


Microscopy & Microanalysis 2016 July 24–28, 2016 Columbus, OH www.microscopy.org


2017


Microscopy & Microanalysis 2017 July 23–27, 2017 St. Louis, MO


www.microscopy.org 2018


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


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


Figure 1 : Scanning electron micrograph of the head of a Saharan silver ant. 8 doi: 10.1017/S155192951500098X 2015 November


T e silver ants of the Sahara desert, Cataglyphis bombycina , inhabit a unique ecological niche where their diet consists mainly of the bodies of insects and other arthropods that cannot survive in the heat as well as they can. Recently, Norman Nan Shi, Cheng-Chia Tsai, Fernando Camino, Gary Bernard, Nanfang Yu, and Rüdiger Wehner showed that the secret to the ants’ survival is the shape of the hairs that cover much (but not all!) of their bodies.


In addition to thermodynamic measurements, full-wave simulations, and heat-transfer modeling, Shi et al. used scanning electron microscopy to examine the hairs that cover only the top and the sides of the ant’s body. T ey found a dense array of parallel hairs that were triangular in cross section. Interestingly, the two surfaces facing outwards were corrugated, whereas the surface facing the ant’s body was fl at. T e array of hairs was structured so that they refl ected visible and near-infrared radiation through phenomena known as Mie scattering and total internal refl ection. T e hair-covered region refl ected 67% of the incoming solar radiation rather than only 41%, as was the case aſt er the hair was removed from the cuticle. T ere were variations in the hairs’ cross-sectional areas, but it was determined that resonance peaks from individual hairs were averaged out so that the hair cover eff ectively acts as a coating with enhanced broadband refl ection in the solar radiation spectrum. Shi et al. compared refl ective properties of triangular and circular hairs of the same cross-sectional area. Even though the refl ectance was similar when the incoming solar radiation was normal to the hair-coated surface, triangular hairs produced an extra enhancement of refl ectivity at oblique angles of incidence. T is is because


Scanning Electron Microscopy Shows How to Keep Cool in the Desert


Stephen W. Carmichael Mayo Clinic , Rochester , MN 55905 carmichael.stephen@mayo.edu


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