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from article Acari

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Parasitiformes body plan. Lateral view of a predatory adult female Mesostigmata showing major body regions and important structures. Scale bar = 0.1 mm (0.004 in.). (Scanning electron micrograph by D. E. Walter)

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from article Acari

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Acariformes body plan. (a) Adult female Oribatida (Sarcoptiformes) in lateral view showing major body regions and important structures. (b) Hexapod larva (Trombidiformes): dorsal view of a chigger, a parasite of vertebrates. (c) Octopod deutonymph…

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from article Anthrax

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A color-enhanced scanning electron micrograph 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 of…

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from article Anthrax

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Micrograph (stained with hematoxylin and eosin) showing submucosal hemorrhage in the small intestine of a person fatally affected by gastrointestinal anthrax. (Credit: Marshal Fox/Centers for Disease Control and Prevention)

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from article Poplar

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Quaking aspen (Populus tremuloides). (Photo courtesy of North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)

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from article Poplar

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Common poplar species. (a) Quaking aspen (P. tremuloides); leaf scar with an axial bud, leaf, and twig. (b) Bigtooth aspen (P. grandidentata); leaf, terminal bud, and twig. (c) Cottonwood poplar (P. deltoides); leaf, leaf scar, terminal bud, and…

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from article Haplosporida

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Spore of Urosporidium fuliginosum.

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from article Haplosporida

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Stages in the development of Icthyosporidium giganteum.

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from article Urodela

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A typical member of the order Urodela: the longtail salamander (Eurycea longicauda). (Photo by Ryan Hagerty, U.S. Fish and Wildlife Service)

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from article Urodela

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World distribution of salamanders (order Urodela), indicated by areas of shaded blue color.

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from article Urodela

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California tiger salamander (Ambystoma californiense). (Photo by John Cleckler, U.S. Fish and Wildlife Service)

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from article Urodela

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The two-toed amphiuma salamander (Amphiuma means). (Photo courtesy of the Southeast Ecological Center, U.S. Geological Survey, Gainesville, FL)

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from article Urodela

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The northern red salamander (Pseudotriton ruber ruber). (Photo by Alicia Lafever, U.S. National Park Service)

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from article Thirst and sodium appetite

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Hypovolemic thirst and sodium appetite are caused by altered sensory information from an underfilled circulation, reinforced by increases in circulating angiotensin II and mineralocorticoids. Angiotensin peptides generated from components of a…

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from article Chamois

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Alpine chamois (Rupicapra rupicapra). (Photograph courtesy of Brent Huffman/Ultimate Ungulate Images)

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from article Bioassay

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In conducting bioassays, researchers often employ laboratory culture tests, which use, for example, bacteria cultured in a petri dish (usually to model an effect on the organism of interest or on some basic cellular function). (Credit:…

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from article Amniota

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Basic types of vertebrate eggs.

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from article Amniota

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Embryo developing in amniote eggs.

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from article Osage orange

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Fruit and foliage of osage orange (Maclura pomifera). (Photo copyright © Karren Wcisel)

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from article Mecoptera

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Male scorpion fly (Panorpa), order Mecoptera.

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from article Magnolia

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Flowers and leaves of the southern magnolia (Magnolia grandiflora). (Photo courtesy of Forest and Kim Starr)

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from article Dental caries

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The disease of dental caries or tooth decay is largely preventable. Bacteria colonize the tooth surface and often produce sufficient acids to demineralize the tooth's enamel. Then, dental plaque can build up on the tooth's surface, creating…

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from article Dental caries

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Early caries (cavity) lesion of a primary first molar (indicated by the arrow). (Copyright © McGraw-Hill Education)

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from article Hackberry

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Hackberry (Celtis occidentalis). (Photo courtesy of North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)

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from article Medical control systems

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Diagram of selected portions of the human motor control system. (After G. L. Gottlieb, D. M. Corcos, and G. C. Agarwal, Strategies for the control of voluntary movements with one mechanical degree of freedom, Behav. Brain Sci., 12:189–250, 1989)

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from article Medical control systems

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Electric hand, a myoelectric prosthesis. (a) Two views of the hand, 2.5 in. (6 cm) across the knuckles, with the cover removed in one view to show the electric motor drive circuit. (b) Child using the electric hand. (Hugh Steeper Ltd.)

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from article Medical control systems

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Hybrid control system using both functional electrical stimulation and orthoses. (a) Hierarchical control scheme. (b) Braces in use. (c) Detail of leg brace. (After Y. Kim and F. A. Spelman, eds., Images of the Twenty-First Century: Proceedings of…

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from article Medical control systems

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Autoclavable pacemaker with a lithium silver vanadium pentoxide battery. (After W. Greatbatch, Pacemaker power sources, IEEE Eng. Med. Biol. Mag., 3(2):15–19, June 1984)

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from article Medical control systems

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Automatic implantable cardioverter defibrillator (AICD) system with pulse generator, leads, and external programmer. (S. Nisam, Cardiac Pacemakers, Inc.)

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from article Microbiome

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Profile of the human microbiome by anatomical niche. DNA sequence analysis reveals the relative abundances of the six most abundant bacterial phyla in the human body. The phyla shown represent 99.6% of the sequences sampled. Cyanobacteria were…

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from article Microbiome

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Cup-and-ball diagrams to conceptualize the ecosystem equilibrium of the microbiota. (a) A diverse microbial ecosystem requires a large amount of applied force (blue arrow; for example, an antibiotic disturbance) to push it out of its stable…

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from article Acquired immune deficiency syndrome (AIDS)

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HIV targets helper T lymphocytes. This illustration shows HIV cells attaching to CD4 coreceptors on a helper T lymphocyte. The depletion of these helper T lymphocytes leads to acquired immune deficiency syndrome (AIDS). (Copyright © McGraw-Hill…

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from article Acquired immune deficiency syndrome (AIDS)

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Scanning electron micrograph of HIV-1 virions budding from a cultured lymphocyte. Multiple round bumps on the cell surface represent sites of assembly and budding of virions (green spheres). (Credit: C. Goldsmith/Centers for Disease Control and…

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from article Saccopharyngiformes

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Pelican or gulper eel (Eurypharynx pelecanoides), a member of the order Saccopharyngiformes. [Photo by Alexei Orlov, Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), Moscow, Russia]

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from article Rosemary

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Leaves of rosemary (Rosmarinus officinalis). (Photograph courtesy of Forest and Kim Starr)

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from article Reproductive system disorders

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The ovaries, fallopian tubes, uterus, cervix, and vagina are sites affected by disorders of the human female reproductive system. (Copyright © McGraw-Hill Education)

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from article Reproductive system disorders

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The testicles (testes), epididymis, vas deferens and seminal vesicles, prostate gland, urethra, and penis are sites affected by disorders of the human male reproductive system. (Copyright © McGraw-Hill Education)

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from article Cisplatin

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Structures of cisplatin and related compounds (transplatin and carboplatin).

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from article Squash

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Zucchini (Cucurbita pepo), a type of summer squash, with flowers. (Credit: Howard F. Schwartz, Colorado State University/www.Bugwood.org)

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from article Squash

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Crookneck squash (Cucurbita moschata). (Credit: Howard F. Schwartz, Colorado State University/www.Bugwood.org)

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from article Squash

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Delicata squash (Cucurbita pepo), a variety of winter squash. (Credit: Shaun Case)

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from article Squash

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Leaves of Cucurbita pepo infected by a squash mosaic virus. (Credit: William M. Brown, Jr./www.Bugwood.org)

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from article Speech

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Human head and thorax. (Courtesy of G. E. Peterson)

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from article Speech

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Action of the glottis during speech. (a) Six successive positions of the vocal folds in one vibration cycle at 120 Hz. (b) Relation between pitch and vocal fold tension. (Courtesy of D. W. Farnsworth)

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from article Speech

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Sound spectrograms of the utterance “speech production.” (a) Energy patterns: A, pulse; B, periodic; C, aperiodic; and D, silence. (b) The dotted lines represent the pitch pattern of the utterance.

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from article Speech

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Computer-generated three-dimensional spectral display of the spoken syllable “yah.”

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from article Speech

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Speech flakes of vowels in the words (a) “far,” (b) “food,” and (c) “fee.” (Courtesy of Charles Wooters)

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