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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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