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from article Ordovician
Ordovician, the second period of the Paleozoic Era.
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from article Ordovician
Early Ordovician (Arenig) paleogeography, major rock suites and potential ocean surface currents; based on remanent magnetism data supplemented by plots of the positions of shelf sea carbonates and reefs.
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from article Soil chemistry
Proper soil chemistry helps a green seedling to sprout out from the soil. Soil chemistry controls the availability of plant nutrients within the soil and thus influences plant growth. (Credit: amenic181/Shutterstock)
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from article Soil chemistry
Extensive chemical weathering can remove essential minerals and elements from soil. Typically, only the most insoluble compounds remain in the soil. For example, iron oxides may persist, imparting a reddish-brown color to the soil. (Credit: Stephen…
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from article Soil chemistry
Factors influencing the chemistry of a soil solution. (Credit: Based on an original illustration created by J. F. Hodson)
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from article Supercritical-fluid chromatography
Block diagram of supercritical-fluid chromatograph. With some detectors (for example, flame ionization), the pressure/flow restrictor is mounted in the detector.
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from article Supercritical-fluid chromatography
High-resolution separation of the oligomers of a methyl silicone by pressure-programmed supercritical-fluid chromatography; each peak in the chromatogram is due to an oligomer with one more Si(CH3)2O group than the previous peak. Pressure is held at…
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from article Cephalochordata
European lancelet (Branchiostoma lanceolatum). (After J. E. Webb, On the populations of Branchiostoma lanceolatum and their relations with the West African lancelets, Proc. Zool. Soc. Lond., 127:131, 1956)
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from article Rhinoceros
Black rhinoceros (Diceros bicornis). (Photo courtesy of Dr. Lloyd Glenn Ingles, copyright © California Academy of Sciences)
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from article Ferret
An endangered black-footed ferret (Mustela nigripes). (Photo copyright © Joseph Dougherty)
