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from article Prehistoric technology

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Elements of stone flaking. (a) Relationship between the core and the flake. (b) Major feature of the ventral or release surface of the flake. (After I. Tattersall, E. Delson, and J. A. Van Couvering, eds., Encyclopedia of Human Evolution and…

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from article Prehistoric technology

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Principal techniques of stone-tool manufacture. (a) Hard-hammer, with free-hand percussion. (b) Anvil technique. (c) Bipolar technique. (d) Soft-hammer percussion. (e) Indirect percussion or punch technique. (f) Pressure flaking. (After I.…

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from article Prehistoric technology

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Potters from the village of Harappa, Pakistan, display their wares in front of a replica of a two-chambered kiln used by ancient potters in the Indus Valley civilization. (Photo courtesy of R. P. Wright)

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from article Bioterrorism

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Civilians are the prime targets in bioterrorist attacks. During World War II, gas masks with filters were distributed to British civilians because of fears of a chemical agent attack. (Credit: Ingram Publishing/SuperStock)

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from article Bioterrorism

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A color-enhanced scanning electron micrograph (SEM) showing splenic tissue from a monkey with inhalation anthrax. Rod-shaped bacilli of Bacillus anthracis (yellow) and an erythrocyte (red) are shown. (Credit: Arthur Friedlander, National Institute…

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from article Infarction

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Magnified gross photograph of a wedge-shaped infarct of kidney (I). Renal cortex (C), medullary pyramid (M), and renal pelvis (P) can be seen.

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from article Infarction

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Gross photograph of a brain section, showing a wedge-shaped infarct (I) that resulted from a thrombus. Secondary hemorrhage has occurred.

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from article Amphetamine

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Molecular structures of amphetamine and methamphetamine (a chemical derivative of amphetamine). (Copyright © McGraw-Hill Education)

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from article Air navigation

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Typical wind triangle, drawn to scale. 1 knot = 1 nmi/h = 0.514 m/s.

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from article Air navigation

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Electronic map display developed by a flight management computer on the pilot's instrument panel of a Boeing 767 airplane. (United Airlines)

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from article Air navigation

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Loran C chain GRI 7980 in the southeastern United States, comprising master station M and slave stations W, X, Y, and Z. A position fix is shown at point A, where the lines of position 7980-Y-45000 and 7980-Z-61000 intersect.

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from article Cerebral palsy

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The spastic forms of cerebral palsy include diplegia, hemiplegia, and quadriplegia. Diplegia refers to greater involvement of the legs and lesser involvement of the arms, hands, and trunk. Hemiplegia refers to involvement of one side of the body…

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from article Botulism

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A colony of Clostridium botulinum, the causative agent of botulism, growing on egg yolk agar. (Credit: Larry Stauffer/Centers for Disease Control and Prevention)

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from article Optical coherence tomography

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Typical optical coherence tomography system, based on a broadband source and fiber-optic Michelson interferometer.

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from article Optical coherence tomography

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Optical coherence tomography images of healthy hamster skin in vivo. (a) Conventional magnitude image. Various layers of skin can be seen in cross section. (b) Result after Doppler processing of the same signal used to create the magnitude image.…

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from article Poppy

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Stems, fruits (capsules), and flower of the opium poppy (Papaver somniferum). By cutting into the fruits soon after the petals have fallen, the opium is obtained. (Photo courtesy of Milan Kořínek)

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from article Synthetic immunology

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Use of synthetic immunotherapy to treat cancer. (Copyright © McGraw-Hill Education)

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from article Cytomegalovirus infection

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Photomicrograph of three enlarged cells with large intranuclear inclusions (each with a clear peripheral halo), which are characteristic of cytomegalovirus infection. In this particular case of an immunosuppressed patient, the cytomegalovirus…

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from article Cytomegalovirus infection

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Cytomegalovirus virion inclusion. A transmission electron microscopic (TEM) image depicting cytomegalovirus virions (complete, mature virus particles) in an unknown tissue sample. (Credit: National Center for Immunization and Respiratory Diseases)

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from article Respiratory system disorders

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Some of the most prevalent lower respiratory tract disorders. (Copyright © McGraw-Hill Education)

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from article Osteoporosis

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The matrix of osteoporotic bone (in comparison to the normal matrix of bone) has enlarged spaces, making the bone more fragile and brittle. (Copyright © McGraw-Hill Education)

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from article Osteoporosis

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Decrease in bone density with age in women. Before menopause, bone loss affects primarily the spine and hip (femur and pelvis); after menopause, bone loss is most pronounced in the radius bone of the forearm.

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from article Appendix (anatomy)

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Junction of the human ileum and colon, showing the cecum and vermiform appendix. (From C. K. Weichert, Anatomy of the Chordates, 4th ed., McGraw-Hill, New York, 1970)

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from article Personalized medicine

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In the application of personalized medicine, physicians and other laboratory personnel utilize the latest genetic technologies in order to make a diagnosis or prescribe a treatment tailored to each individual patient. (Credit:…

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