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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 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 Pomegranate

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Pomegranate (Punica granatum). (Photo courtesy of the Agricultural Research Service Germplasm Repository)

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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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from article Echolocation

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Echolocation is a physiological tool used by gray bats (Myotis grisescens). (Credit: Amareta Kelly)

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from article Echolocation

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Sound spectrograms representing sonar signals of (a) Brazilian or Mexican free-tailed bats (Tadarida brasiliensis), (b) big brown bats (Eptesicus fuscus), (c) Wagner's mustached bats (Pteronotus personatus), and (d) greater horseshoe bats…

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