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from article Botulism
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 Foot-and-mouth disease
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
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
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
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
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
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 Medical ultrasonic tomography
Ultrasonic B-scan of the abdomen.
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from article Borrelia
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 Grassland ecosystem
Map of grassland types in central and western North America.
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from article Water conservation
Drying lake because of drought. (Credit: Tim McCabe/USDA Natural Resources Conservation Service)
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from article Tay-Sachs disease
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
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
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
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 Population dispersion
Basic patterns of the dispersion of individuals in a population. (a) Random. (b) Uniform. (c) Clumped, but groups random. (After E. P. Odum, Fundamentals of Ecology, Saunders, 1953)
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from article Population dispersion
Distances measured in four methods of plotless sampling. (a) Closest individual. (b) Nearest neighbor. (c) Random pairs, with 180° exclusion angle. (d) Point-centered quarter. The cross represents the sampling point in each case. (After P.…
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from article Pseudoscorpionida
An unidentified pseudoscorpion species of the family Atemnidae. (Photo copyright © Gonzalo Giribet)
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from article Pseudoscorpionida
Synsphyronus apimelus, a pseudoscorpion belonging to the family Garypidae. (Photo copyright © Gonzalo Giribet)
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from article Pseudoscorpionida
Pseudoscorpion morphology. (a) Adult, in two views. (b) Chelicera of a male pseudoscorpion. (Illustration based on an original by H. S. Pratt)
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from article Retrovirus
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
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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from article Thyroid gland disorders
Thyroid gland and related anatomical structures. (Copyright © McGraw-Hill Education)
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from article Thyroid gland disorders
Follicular adenomas constitute most thyroid neoplasms. The bottom half of the photomicrograph has a follicular adenoma, with a rim of normal thyroid gland seen in the remainder of the image. The follicular adenoma has a thin capsule (arrow). In…
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from article Strychnos
Strychnos nux-vomica: close-up view of leaves and flowering branch. (Photo courtesy of Dinesh Valke)
