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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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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 Siderite
Siderite specimen. (RF Company/Alamy)
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from article Heat balance of the Earth
Heat balance of the Earth and the atmosphere system. The solar (SOL) constant used in the calculations is 1366 W/m2 so that the effective incoming solar flux is 342 W/m2, while the global albedo used is 30%. The atmosphere given in the figure…
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from article Heat balance of the Earth
Components of the annual mean absorbed solar flux, emitted infrared flux, and net radiative flux as functions of latitude at the top of the atmosphere derived from satellite broadband radiation measurements. (Data taken from K. N. Liou, 2002)
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from article Cellulose
Microscopic view of cotton fibers, which contain 98% cellulose. (Credit: Martin Kreutz/agefotostock)
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from article Cellulose
Positioning of β-d-glucopyranosyl units in cellulose structure.
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from article Cellulose
Cellulose is the principal structural component of plants. In particular, cellulose in the plant cell wall is found mainly in the form of threadlike fibers, composed of smaller fibrils (microfibrils). (Copyright © McGraw-Hill Education)
