Spike (M.I.) Walker
English photomicrographer Spike (M.I.) Walker has been a consistent winner of the Nikon Small World competition for many years and has published many articles and a book about microscopy. Featured below is a photomicrograph of an arranged diatom specimen taken with polarizing interference illumination.
Photomicrograph of mixed diatoms, from an arranged group by Schrader. A Zeiss 10x/0.22 NA polarizing interference objective was used to produce this Jamin-Lebedeff image. Differences in optical wave path are translated into color differences. Illumination was provided by a 12-volt 100-watt lamp utilizing a Zeiss Ultraphot IIIB microscope with 35 millimeter automatic photohead. Photographed with Fujichrome Velvia. (63x)
Diatoms are single-celled algae of the phylum Bacillariophyta and are found in all the Earth's oceans. One of the most prolific sea organisms, the nearly 16,000 species of this group form a significant portion of the aquatic food chain. Diatom cell walls are composed of silica fashioned into a myriad of beautiful geometrical shapes and patterns. Diatomaceous earth, a substance composed of fossil diatoms, is used for making filters, insulation, abrasives, paints, and varnishes.
BACK TO SPIKE WALKER GALLERY
Questions or comments? Send us an email.
Text and graphics for this article are
© 2000-2013 by Spike (M. I.) Walker.
All Rights Reserved under copyright law.
© 1995-2015 by
Michael W. Davidson
and The Florida State University.
All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Friday, Nov 13, 2015 at 02:18 PM
Access Count Since November 18, 2000: 16599
Microscopes provided by: