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from article Acoustic microscope
Acoustic lens.
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from article Acoustic microscope
Acoustic images. (a) Bipolar transistor on silicon integrated circuit and (b) myxobacterium, both images taken in superfluid helium at 0.2 K (from J. S. Foster and D. Rugar, Low-temperature acoustic microscopy, IEEE Trans., SU-32, 139–151, 1985).…
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from article Acoustic microscope
Acoustic rays interacting to produce contrast enhancement in imaging at defocus and to generate V(z) curve.
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from article Cryptomonadida
Examples of cryptomonads. (a) Chilomonas paramecium. (b) Cryptomonas erosa.
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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 Lawrencium
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from article Gravimetric analysis
In gravimetric analysis, a filtration step is required to collect the precipitate. (Credit: Matt Meadows/McGraw-Hill Education)
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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 Porcupine
North American porcupine (Erethizon dorsatum). (Photo from National Park Service)
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from article Eclipsing variable star
Relative sizes and separation of components of R Canis Majoris. Shaded star represents cooler component. It is shown in two positions: at the middle of an eclipse and when separation would be greatest as viewed from Earth. Even at the greatest…
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from article Eclipsing variable star
Model generally accepted for certain types of eclipsing binary stars, in particular those known as dwarf novae.
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from article Neandertal DNA
The geographical range within which Neandertal remains have been found (dashed line). White dots show the sites of the discoveries used to estimate the almost-complete hypervariable segment I (HVS-I) sequence of the Neandertal mtDNA. The approximate…
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from article Neandertal DNA
The mtDNA hypervariable segment I (HVS-I) diversity found in eight Neandertals. The nucleotide substitutions and insertions relative to the Cambridge Reference Sequence (CRS) are shaded. (Credit: Igor Ovchinnikov and William Goodwin)
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from article Neandertal DNA
Phylogenetic analysis of the Neandertal mtDNA hypervariable segment I (HVS-I) sequence. (a) Neighbor-joining tree of the Neandertal mtDNA sequences and 2500 modern human HVS-I sequences from 43 modern populations. (b) Neighbor-joining tree of the…
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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 Cognition
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
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
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 Oral gland
The three major bilateral pairs of salivary oral glands found in mammals: the parotid, submandibular, and sublingual glands. (Copyright © McGraw Hill)
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from article Xiphosurida
Segmentation of Limulus polyphemus. Inconclusive evidence indicates that there are 15 segments (6 in the prosoma, 9 in the opisthosoma). The telson (XV) may be a terminal spine that has become articulated and has incorporated the anus into its base.…
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from article Xiphosurida
Phylogeny and representative species of the order Xiphosura, including the suborder Xiphosurida and its sister group, synziphosurines (a paraphyletic stem group). (Copyright © McGraw Hill)
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from article Xiphosurida
Paleolimulus signatus, a limuline xiphosurid from the Permian of Kansas, showing appendages and book gills. Length of specimen: 1.25 cm (0.5 in.). (Copyright © McGraw Hill)
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from article Xiphosurida
Carapaces of adult male horseshoe crabs: (a) Limulus polyphemus; (b) Tachypleus tridentatus; (c) Carcinoscorpius rotundicauda. (Copyright © McGraw Hill)
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from article Xiphosurida
Embryonic and larval development of Limulus polyphemus. (a) Early embryo, side view. (b) Late embryo. (c) Yolk-filled digestive tract of larva. Note the segmentation of yolk in the newly hatched stage and the six lobes of digestive gland. (d) First…
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from article Xiphosurida
Morphology of adult male Limulus polyphemus. (a) Dorsal view. (b) Ventral view, appendages not shown. (c) Cross section through prosoma showing internal anatomy. (d) Posterior view. (e) Lateral view. (Copyright © McGraw Hill)
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from article Slope
Slope of a line.
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from article Slope
Slope of a curve.
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from article Feather
Typical flight feather. (a) Full view. (b) Detail of base. (c) Detail of vane. (After J. Van Tyne and A. J. Berger, Fundamentals of Ornithology, 2d ed., John Wiley and Sons, 1976)
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from article Feather
Parts of three barbs from a vaned feather, showing the hooking mechanism of the overlapping barbules. (After J. C. Welty, The Life of Birds, Saunders, 1962)
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from article Feather
Types of feathers, (a) Filoplume. (b) Vane or contour. (c) Down. (d) Semiplume. (After J. C. Welty, The Life of Birds, Saunders, 1962)
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from article Feather
Section through growing feather follicle. (After R. I. C. Spearman, The keratinization of epidermal scales, feathers, and hairs, Biol. Rev., 41:59–69, 1966)
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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 Chromatophore
Chromatophores in the skin of the cephalopod squid Loligo (Doryteuthis) plei. Large brownish chromatophores are encircled by medium-sized red chromatophores, and small yellow chromatophores are interspersed throughout the skin. Each chromatophore…
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from article Chromatophore
Skin of the common prawn Palaemon (Leander) serratus, with red and white chromatophores showing a twofold effect upon injecting the prawn with a sinus-gland extract. Red pigment becomes less dispersed and some is converted into a blue color diffused…
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from article Chromatophore
Skin of a squirrelfish (Holocentrus adscensionis) with chromatophores as seen by transmitted light. Note the few large finely branched melanophores and many small erythrophores (seen as balls of concentrated red) over a screen of larger oval…
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from article Chromatophore
A squirrel tree frog (Hyla squirella) hanging on a branch. This frog is capable of displaying a variety of different colors, especially shades of green, yellow, and brown. Its coloration is an adaptive feature resulting from chromatophore changes…
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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)
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from article Mammoth
Skeleton of a mammoth (genus Mammuthus). (Credit: Beatrissa/Shutterstock)
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from article Mammoth
Photograph of the grinding surfaces of a molar tooth of an adult Mammuthus columbi (main image) and a tooth from a baby mammoth (lower-left image). Cross ridges of enamel show various stages of wear, with dentine in the middle of each pair of…
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from article Mammoth
View of a sculpture of a mammoth at the La Brea Tar Pits and Museum in Los Angeles, California. (Credit: Zack Frank/Shutterstock)
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from article Mammoth
Pictographs of a mammoth and a bison at a site along the San Juan River in Utah: (top) photo without enhancement; (bottom) labeled photo with colorized mammoth and bison. (Credit: Ekkehart Malotki)
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from article Plant cell wall
Stylized model of the plant primary cell wall, showing layers of semicrystalline cellulose microfibrils associating with cross-linking hemicellulose polymers, embedded in a pectin matrix. (Copyright © McGraw-Hill Education)
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from article Plant cell wall
Light microscopy image of the outer cell layers and cuticle of a tomato fruit. The cuticle in this organ, shown here with a red stain, forms an exceptionally thick lipid coating on the outer epidermal cell and also permeates into the underlying cell…
