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from article Androgenic-anabolic steroids

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Chemical structures of the male sex hormone testosterone and a number of androgenic-anabolic steroids (derived from testosterone) used for therapeutic use. (Copyright © McGraw-Hill Education)

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from article Androgenic-anabolic steroids

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Androgenic-anabolic steroids possess strong muscle-building properties. Muscle mass increment can be attributed to enlargement of muscle fibers and an increase of the number of muscle fibers. (Credit: photobac/Getty Images)

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from article Channelrhodopsin

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Three-dimensional (3D) protein crystal structure of channelrhodopsin variant C1C2. (Image courtesy of Protein Data Bank 3UG9, Molecular Modeling Database 96737)

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from article Plague

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Plague ecology in the United States. The left panel shows how plague occurs in nature among rodents. The right panel shows how plague is spread from rodents to humans and domestic animals. (Credit: Centers for Disease Control and Prevention)

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from article Nursing

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Nursing provides physical and emotional care to ailing individuals. (Credit: Fuse/Getty Images)

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from article Human-factors engineering

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Human-factors engineers design modern computer equipment, including ergonomic keyboards and mouse devices, to accommodate the varied physical contours and dimensions of the human hand. (Credit: JG Photography/Alamy)

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from article Human-factors engineering

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Human-factors engineering addresses problems related to the design of seats, workplaces, and consoles in terms of a user's physical size, comfort, strength, and visibility. (Copyright © McGraw-Hill Education)

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from article Foot-and-mouth disease

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Mouth of a steer with foot-and-mouth disease lesions on the tongue, along the lower gum, and inside the lower lip.

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from article Foot-and-mouth disease

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Schematic diagram of the capsid of a foot-and- mouth disease virion. The four structural proteins, VP1–4 (also called 1A, 1B, 1C, and 1D), make up a protein subunit or protomer. Five protomers join to form a pentamer, and a capsid is an assembly of…

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from article Particle track etching

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Upper images show increasing radiation damage produced by a high-energy uranium nucleus in the cosmic radiation as it penetrates a thick stack of Lexan plastic sheets and slows down. The lengths of the etched cones in these three sheets, taken at…

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from article Particle track etching

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Etched conical pits in a sheet of allyl diglycol carbonate (CR-39 plastic) irradiated at normal incidence with 60-MeV alpha particles. (From P. B. Price et al., Do energetic heavy nuclei penetrate deeply into the Earth's atmosphere?, Proc. Nat.…

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from article Particle track etching

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Etched fossil particle tracks. (a) Tracks from spontaneous fission of 238U and 244Pu in a zircon crystal from a lunar breccia, seen by scanning electron microscopy (from D. Braddy et al., Crystal chemistry of Pu and U and concordant fission track…

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from article Particle track etching

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Reconstructed images of right and left breasts of a patient taken by using a 3600-MeV carbon-ion beam at the Lawrence Berkeley Laboratory Bevalac accelerator. Arrow indicates 1-cm (0.4-in.) carcinoma. (From C. A. Tobias et al., Lawrence Berkeley…

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from article Borrelia

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A digitally colorized scanning electron micrograph of a grouping of numerous Borrelia burgdorferi bacteria. The B. burgdorferi pathogen is responsible for causing Lyme disease, which is transmitted to humans by way of a tick bite. Borrelia…

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from article Cognition

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The internal structures and processes that constitute the basis for cognition emanate from the brain (shown here in a colorized magnetic resonance image). (Credit: Shutterstock)

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from article Cognition

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Cognitive models of information processing take into account information from the environment, sensory and perceptual processes, memory, thinking, and language. (Copyright © McGraw-Hill Education)

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from article Cognition

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Light micrograph of Purkinje neurons (light blue) in the cerebellum. Nerve cells of the brain act collectively to process information needed for proper cognitive functioning. (Credit: Steve Gschmeissner/Science Photo Library/Alamy Stock Photo)

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from article Tay-Sachs disease

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Healthy neuron (top) and neuron affected by Tay-Sachs disease (bottom). Defective hexosaminidase A enzyme activities in the case of Tay-Sachs disease allow lipid substrates to be stored in lysosomal compartments. This abnormal storage becomes toxic,…

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from article Tay-Sachs disease

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Retinal cherry-red spot in a patient with Tay-Sachs disease. As the disease progresses, affected individuals may develop gradual loss of vision. (Copyright © McGraw-Hill Education)

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from article Tay-Sachs disease

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Tay-Sachs disease results from mutations of a gene known as the HEX A gene, which encodes the α-subunit of the hexosaminidase A enzyme. When both partners are mutation carriers, each pregnancy has a 25% chance of being affected. (Copyright ©…

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from article Pseudomonas

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Photomicrograph of stained Pseudomonas aeruginosa bacteria. Each bacterium possesses a single polar flagellum. (Credit: Lisa Burgess; copyright © McGraw-Hill Education)

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from article Retrovirus

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Different morphological types of retroviruses. (a) Murine mammary tumor virus, a Betaretrovirus, shown with its off-center core surrounded by an envelope. (b) Feline leukemia virus, a Gammaretrovirus, shown with its centrally located core. (c)…

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from article Smallpox

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A transmission electron micrograph of smallpox viruses using a negative stain technique. (Credit: Frederick A. Murphy/U.S. Centers for Disease Control and Prevention)

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