Nov 12, 2024
Crystal of virus. Magnification : 122, 700X. Electron micrograph. Courtesy Dr. C. Morgan, Department of Microbiology, Columbia University.
Module, proportion, symmetry, rhythm, by Kepes, Gyorgy, 1906-
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Crystal of virus. Magnification : 122, 700X. Electron micrograph. Courtesy Dr. C. Morgan, Department of Microbiology, Columbia University.
Module, proportion, symmetry, rhythm, by Kepes, Gyorgy, 1906-
Antenna (zoology) - Wikipedia
This colorized scanning electron micrograph shows the mouth parts of a brown dog tick, one of the most important disease vectors in dogs worldwide. Ticks that carry human pathogens are spreading in the U.S., triggering an increase in tick-borne diseases, including some that are difficult to diagnose and treat.
PHOTOGRAPH BY STEVE GSCHMEISSNER, SCIENCE SOURCE
العصب الشوكي للإنسان، أخذت الصورة بواسطة الميكروغراف الإلكتروني.
Human spinal nerve taken with electron micrograph
Cancer Clues
How on earth, you might ask, can the hairs on the backs of fruit flies (pictured), teach scientists about cancer? Well, it’s all to do with asymmetric cell division. As a person (or fly) develops from a single fertilised egg, the initial cell divisions are symmetrical, but later asymmetrical divisions become important for establishing the different tissues of the body. Indeed, the hairs on flies’ backs are a perfect example, because they form only if the underlying cells divide in the correct asymmetrical manner. In the normal fly (left) asymmetric cell divisions are as they should be, but the bald-backed fly (right) has a mutation causing the asymmetry to be lost and hair development to fail. Cancer sometimes initiates when the normal asymmetric divisions of stem cells become symmetrical – leading to self-renewal without differentiation. Learning how flies’ hair cells divide, could therefore also provide clues to how cancer kicks off.
Written by Ruth Williams
Images from work by Sylvain Loubéry & Alicia Daeden and colleagues
University of Geneva, Geneva, Switzerland
Image originally published under a Creative Commons Licence (BY 4.0)
Published in Nature Communications, June 2017
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The crystal shown in figure 8.26 was growth in a laboratory with no subsequent intervention.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.
For example, let's look at electron micrographs of two very different crystals of calcium carbonate.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.