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from article Trilobita
Two iron-stained trilobites (Paradoxides) on a bedding plane slab from Morocco, North Africa, of Cambrian age. (Credit: Alan Morgan)
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Image
from article Trilobita
Trilobite diversity and preservation. (a) Olenellid, Lower Cambrian (British Columbia). External mold of exoskeleton in shale. (b) Ogygopsis, Middle Cambrian (British Columbia). Molt assemblage, with cranidium and pygidium aligned, but librigenae,…
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from article Trilobita
Morphological features of trilobites. (a) Calymene, Silurian (New York). Dorsal view of mineralized exoskeleton. (b) Phacops, Devonian (Ohio). Ventral (bottom) view of cephalon and anterior segments of the thorax, with hypostome attached. (c)…
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from article Trilobita
Triarthrus eatoni, Upper Ordovician (New York). Reconstruction with dorsal exoskeleton removed on right side to show appendages. Antennae are incomplete. Exites (gill branches) of the first nine postantennal appendages are removed to show the…
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from article Radiation injury to plants and animals
The total range of wavelengths and frequencies of electromagnetic radiation, extending from the longest radio waves to the shortest known cosmic rays. In general, exposure to electromagnetic radiation can be injurious to living matter, resulting in…
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from article Radiation injury to plants and animals
Thirty-day mortality of mice exposed acutely to fast neutrons, x-rays, and gamma rays. (Credit: A. C. Upton)
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from article Radiation injury to plants and animals
Squamous cell carcinoma is one of the most common forms of human skin cancer and is often caused by exposure to various forms of ionizing or ultraviolet radiation. (Copyright © McGraw-Hill Education)
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from article Photoelasticity
Basic photoelastic polariscope.
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from article Photoelasticity
Isochromatic fringe pattern for plate with hole. (From M. M. Frocht, Photoelasticity, vol. 2, John Wiley and Sons, 1948)
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from article Radian measure
Diagrams showing radian measurement. Symbols are explained in the text.
