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from article Polarized light microscope

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Diagram of a high-sensitivity biological polarizing microscope. Polarizing microscopes for petrography may not require the use of the expensive prism polarizer and analyzer, which can be replaced by dichroic polarizing filters. Some petrographic…

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from article Atmospheric chemistry

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The nitrogen cycle has important implications for air quality and climate in addition to fisheries and marine ecosystems. Anthropogenic activities have perturbed the natural nitrogen cycle, with major effects on the atmosphere and marine systems.…

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from article Atmospheric chemistry

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Components of the carbon cycle showing the movement of carbon between land, the atmosphere, and oceans. Yellow numbers are natural fluxes, and red are human contributions in gigatons of carbon per year. White numbers indicate stored carbon. (NASA:…

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from article Anemia

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Hemoglobin molecule. (Copyright © McGraw-Hill Education)

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from article Anemia

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Aplastic anemia. This low-power photomicrograph of the bone marrow exhibits only a small amount of hematopoiesis (the process by which the cellular elements of the blood are formed). (Copyright © McGraw-Hill Education)

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from article Anemia

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Iron-deficiency anemia. Most red cells in this photomicrograph exhibit central pallor (arrow). Also present is a characteristic pencil-shaped cell (arrowhead). (Copyright © McGraw-Hill Education)

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from article Forest engineering

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A harvesting machine removing selected trees in a thinning operation designed to enhance the growth of the trees that remain after the operation. The “processing head” is holding a horizontal tree stem that is being delimbed and processed into logs…

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from article Forest engineering

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A well-engineered forest road and timber bridge in the Tongass National Forest in southeast Alaska. The bridge, designed to support heavy logging trucks, was used rather than a culvert to reduce erosion and protect water quality. (Photograph…

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from article Homocysteine

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Homocysteine metabolism. CBS, cystathionine ß-synthase; MTHFR, 5,10-methylene tetrahydrofolate reductase; MS, methionine synthase; BHMT, betaine:homocysteine methyltransferase; SAM, S-adenosylmethionine; SAH, S-adenosylhomocysteine; 5-methyl THF,…

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