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from article Pituitary gland disorders
Anatomy of the human pituitary gland, which is attached to the base of the brain. (Copyright © McGraw Hill)
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Image
from article Pituitary gland disorders
Infarction (obstruction of the blood supply) of the pituitary gland. This pituitary gland is almost entirely infarcted. Only a thin rim of viable cells remains (arrow). Pituitary infarcts can occur during pregnancy (Sheehan's disease) or as a result…
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from article Strychnos
Strychnos nux-vomica: close-up view of leaves and flowering branch. (Photo courtesy of Dinesh Valke)
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from article Space flight
Earthrise, with the surface of the Moon in the foreground, photographed by astronauts aboard the Apollo 8 mission in late 1968. Apollo 8 was the first crewed mission to the Moon. (Credit: NASA)
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from article Space flight
Soyuz, a third-generation Soviet spacecraft. 1 m = 3.3 ft.
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from article Space flight
Comparison of U.S. spacecraft and launch vehicle configurations through 1972. (Credit: NASA)
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from article Space flight
The Apollo 11 lunar module on the surface of the Moon in July 1969. (Credit: NASA)
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from article Space flight
Skylab in orbit around Earth. (Credit: NASA)
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from article Space flight
The space shuttle Discovery launching in July 2006. (Credit: NASA)
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from article Space flight
Shuttle Atlantis returning home to Kennedy Space Center after its final mission, July 21, 2011. (Credit: NASA)
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from article Space flight
The completed International Space Station in orbit around Earth. (Credit: NASA)
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from article Space flight
Artist's impression of the Space Launch System with the Orion spacecraft on top. (Credit: NASA)
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from article Wire drawing
Wire being drawn through a die.
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from article Wire drawing
Comparison of (a) ideal and (b) redundant deformation.
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from article Wire drawing
Variation of the work terms with die angle according to Eqs. (1), (3), (4), and (6), with ε = 0.3 and η = 0.08.
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from article Wire drawing
Dependence of the efficiency on die angle for several reductions. A friction coefficient of μ = 0.08 was assumed.
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from article Wire drawing
Comparison of the predictions of I.F. from Eq. (12) with experiments on copper.
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from article Wire drawing
Microstructure of a tungsten wire cold-drawn to an 87% reduction of area, viewed along the wire axis.
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from article Metal rolling
Rolling process. (a) Direction of friction forces in the roll gap. (b) Velocity distribution. (c) Normal pressure acting on the strip in the roll gap.
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from article Metal rolling
Basic types of roll arrangement. (a) Two-high. (b) Three-high. (c) Four-high. (d) Cluster. (e) Tandem rolling with three stands. (f) Planetary mill.
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from article Metal rolling
Development of the Mannesmann process for producing seamless tubing (a–c explained in text).
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from article Trace fossils
Domichnial dwelling burrow with pelleted wall, probably created by a burrowing crustacean. Ophiomorpha, Cretaceous, North Dakota. (From W. Häntzschel, in C. Teichert, ed., Treatise on Invertebrate Paleontology, pt. W, revised, University of Kansas…
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from article Trace fossils
Highly branched, fodinichnial mining burrow, possibly produced by a deposit-feeding crustacean or worm. (a) Chondrites, Tertiary, Austria. (b) Chondrites, Tertiary, Spain. (From W. Häntzschel, in C. Teichert, ed., Treatise on Invertebrate…
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from article Trace fossils
Agrichnial farming trace of an unknown organism, composed of a hexagonal, meshlike network of tunnels. Paleodictyon, Tertiary, Poland. (Photograph by W. Häntzschel)
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from article Trace fossils
Agrichnial farming traces of unknown organisms, including a double-spiral tunnel (Spirorhaphe) and a meshlike network of tunnels (Paleodictyon). Tertiary, Austria. (Photograph by W. Häntzschel)
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from article Trace fossils
Loosely meandering, agrichnial farming trace of an unknown organism. Cosmorhaphe, Tertiary, Poland. (From W. Häntzschel, in C. Teichert, ed., Treatise on Invertebrate Paleontology, pt. W, revised, University of Kansas Press, 1975)
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from article Trace fossils
Praedichnial boring drilled in a bivalve shell by a carnivorous gastropod. Oichnus, Recent, Texas. (Photograph by A. A. Ekdale)
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from article Trace fossils
Tightly meandering, pascichnial grazing trail, created by an unknown worm. Helminthoida, Tertiary, Austria. (From W. Häntzschel, in C. Teichert, ed., Treatise on Invertebrate Paleontology, pt. W, revised, University of Kansas Press, 1975)
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from article Trace fossils
Repichnial trail of an arthropod, possibly a trilobite. Cruziana, Cambrian, Alberta. (Photograph by J. P. A. Magwood)
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from article Trace fossils
Unnamed escape structure (fugichnial trace) in sandstone. Cretaceous, Utah. (Photograph by A. A. Ekdale)
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from article Trace fossils
Cubichnial resting trace of an ophiuroid brittle star. Asteriacites, Jurassic, Germany. (Photograph by W. Häntzschel)
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from article Trace fossils
Complex, composite ichnofabric created by numerous successive phases of burrowing in a fine-grained pelagic carbonate deposit, which has been weakly cemented to become chalk. Upper Cretaceous, Denmark. (Photograph by A. A. Ekdale and R. G. Bromley)
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from article Aconchulinida
Aconchulinida. (a) Penardia cometa. (b) Penardia mutabilis.
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from article Surveillance radar
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from article Siphonaptera
Head of Spilopsyllus cuniculi (rabbit flea), with extended mouthparts.
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from article Guided missile
A U.S. Navy ship fires a Tomahawk cruise missile at a target in Libya as part of Operation Odyssey Dawn in 2011. (Credit: MC3 Jonathan Sunderman/US Navy/DoD)
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from article Guided missile
A V-2 rocket constructed by the U.S. military lifts off in this historical photo. Production and development of V-2 rockets continued in the United States after the defection of German aerospace engineers during World War II. (Credit: U.S. Army)
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from article Neandertals
Neandertal cranium excavated from Forbes' Quarry, Gibraltar. Note the pronounced brow ridges, large braincase, and receding forehead. (Credit: Clive Finlayson/Gibraltar Museum)
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from article Neandertals
Gorham's Cave, Gibraltar, is the last known site of Neandertal occupation, being dated possibly to 30,000 years ago. (Credit: Clive Finlayson/Gibraltar Museum)
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from article Neandertals
Reconstructed skull of a Neandertal from the cave at La Chapelle-aux-Saints, France. (Credit: Illustration adapted from an original drawing by M. F. Ashley Montagu)
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from article Atomic bomb
The mushroom cloud over Nagasaki, Japan, after an atomic bomb was dropped by U.S. aircraft on August 9, 1945. (Credit: Everett Historical/Shutterstock)
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from article Atomic bomb
Conceptual diagrams illustrating the main features of (a) implosion type and (b) gun-barrel type of fission weapons. (Credit: A. DeVolpi)
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from article Gain
Gain by an amplifier or other system.
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from article Gain
Bode diagrams. (a) Gain plot. (b) Phase plot.
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from article Breadfruit
Breadfruit (Artocarpus altilis), showing the rounded (or elliptic) fruit and the cylindrical staminate flower cluster. (Photo courtesy of Forest and Kim Starr)
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from article Robotics
A dexterous humanoid robot (robonaut) built at the NASA Johnson Space Center in Houston, Texas, USA to work alongside humans in space. (Credit: NASA)
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from article Robotics
A model for the selective compliance assembly robot arm (SCARA). It has 3 links. Horizontal links move sideways and the third (vertical) link moves up and down. It shown here with a drill, a chuck, and drill bit. (Credit: Richard Pasala)
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from article Robotics
The right hand of a NASA robot grasping a hook. The robot's hands closely mimics the human hand in order to use tools and handholds designed for astronauts. (Source: NASA)
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from article Robotics
Six-legged walking robot. (Odetics)
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from article Optical flat
Optical flat being used to determine flatness of seal ring. Interference bands on the seal ring face show lines of constant depth. (Van Keuren Co.)
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from article Optical flat
Measurement of height of sphere determined by means of gage blocks and optical flat. 1″ = 25.4 mm.
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from article Composite material
NASA technicians inspecting the keel section of a PRSEUS (Pultruded Rod Stitched Efficient Unitized Structure). This is a new way for aircraft sections to be built by sewing together layers and rods of composite material. (Credit: NASA…
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from article Composite material
Specific properties of various materials.
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from article Composite material
Tensile strength, modulus, and elasticity of various fiber materials. UHMWPE = ultrahigh-molecular-weight polyethylene; SiC = silicon carbide.
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from article Composite material
Typical autoclave layup.
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from article Composite material
Typical layups for (a) resin transfer molding (RTM) and (b) vacuum infusion (VI).
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from article Folic acid
Chemical structure of folic acid (C19H19N7O6). (Copyright © McGraw Hill)
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from article Digenea
Diagrams of various adult types of digenean trematodes. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Digenea
Digenean trematode life cycle. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Hydroponics
Green- and red-leaf lettuce growing in a hydroponic vegetable garden on a bamboo fence. The pipes, which supply nutrients and water, are part of the hydroponic system. (Credit: Piyachok Thawornmat, Shutterstock)
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from article Hydroponics
Hydroponic techniques: (a) aerated standing culture; (b) flowing-solution culture with standing solution; (c) nutrient film technique; (d) aeroponics.
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from article Uninterruptible power supply
Block diagram of a line-preferred UPS (off-line technology).
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from article Uninterruptible power supply
Block diagram of an on-line UPS with bypass switch.
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from article Uninterruptible power supply
Block diagram of the flywheel rotary UPS topology.
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from article Uninterruptible power supply
Block diagram of diesel rotary UPS topology.
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from article Uninterruptible power supply
Block diagram of the online distributed configuration.
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from article Uninterruptible power supply
Block diagram of line-interactive distributed application.
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from article Uninterruptible power supply
Block diagram of the centralized approach.
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from article Mango
Tommy Atkins cultivar of mango (Mangifera indica) growing in Florida. (Credit: Wilhelmina Wasik/Agricultural Research Service, U.S. Department of Agriculture)
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from article Tomato
Tomatoes (Solanum lycopersicum). (Credit: Peggy Greb, Agricultural Research Service, U.S. Department of Agriculture)
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from article Tomato
Tomato affected by anthracnose (caused by the fungus Colletotrichum phomoides). (Credit: U.S. Department of Agriculture Cooperative Extension Slide Series, Clemson University)
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from article Tomato
Tomatoes showing blossom-end rot. (Credit: Mary Ann Hansen, Virginia Polytechnic Institute and State University)
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from article Ohmmeter
Electronic digital ohmmeter. (Tinsley)
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from article Ohmmeter
Diagram of ohmmeter, showing operating principles. C1, C2 = current terminals; P1, P2 = potential terminals.
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from article Ohmmeter
Special measuring probes (Kelvin clips), consisting of a set of leads with combined current probes (C1, C2) and potential probes (P1, P2).
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from article Mixing
Typical impeller-type liquid mixer. (After V. W. Uhl and J. B. Gray, Mixing: Theory and Practice, vol. 2, Academic Press, 1967)
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from article Mixing
Effect of impeller size and speed on flow and turbulence (shear) at constant power.
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from article Mixing
Common impellers. (a) Marine-type mixing propeller. (b) Axial-flow (pitched-blade) turbine. (c) Flat-blade (Rushton) turbine. (After R. H. Perry and C. H. Chilton, eds., Chemical Engineers' Handbook, 5th ed., McGraw-Hill, 1973)
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from article Mixing
Swirling flow pattern for impeller of any shape, without baffles. (a) Side view. (b) Bottom view.
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from article Mixing
Flow patterns with baffles. (a) Flow pattern for propeller with baffles at tank wall. (b) Flow pattern for turbine with baffles at tank wall.
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from article Mixing
Flow pattern for top-entering, off-center propeller without baffles: (a) front, (b) top, and (c) side views.
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from article Mixing
Side-entering propeller mixer position. With proper propeller position, no vortex will result.
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from article Mixing
Ribbon turbine with double spiral, for high-viscosity liquids.
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from article Mixing
Coexistence of (a) chaotic and (b) nonchaotic mixing in a duct-type flow.
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from article Mixing
Unmixing of particles of two different sizes in a rotating tumbler operating in a time periodic mode.
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from article Pine nut
Pine nuts in their hard shell (Mexican piñon pine, Pinus cembroides). (Photo by Steve Hurst, U.S. Department of Agriculture–Natural Resources Conservation Service PLANTS Database)
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from article Pine nut
Cone containing pine nuts (stone pine, Pinus pinea). (Photo by Vito Buono, Bari, Italy)
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from article Ctenothrissiformes
A Cretaceous ctenothrissiform fossil, Ctenothrissa sp. (order Ctenothrissiformes), on a limestone matrix found in Lebanon. Size: 90 mm (3.5 in.). (Photo courtesy of The Virtual Fossil Museum)
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from article Electric power generation
Coal-fired electric power plant. (Credit: mrclark321/Getty Images)
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from article Electric power generation
Steam power plant flow diagram.
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from article Electric power generation
Gas turbine plant flow diagram.
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from article Electric power generation
Cross section of a hydroelectric powerhouse. Arrangement is typical for an adjustable propeller-type reaction turbine. The intake and powerhouse are integral; waterways consist of intake, scroll case, and draft tube. Turbine and generator are set…
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from article Solution mining
Solution mining of a subsurface evaporite deposit. Mining is normally initiated at the bottom of the deposit and retreats vertically, leaving a mined-out cavity. Saturated brine is heavier (denser), and is recovered from the bottom of the cavity.…
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from article Solution mining
Forced-air ventilation of sulfide ore heaps during biooxidation.
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from article Solution mining
Sulfur production well in a Gulf Coast salt dome deposit. (a) Superheated water is pumped down the inner and outer casing strings. (b) Molten sulfur enters inner casing string. (c) Sulfur is jetted to the surface as a result of compressed air being…
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from article Assessing risks from nanomaterials
The size and scale of nanomaterials. The novel properties of materials with at least one dimension smaller than 100 nanometers can cause them to behave differently from their bulk counterparts. (Credit: National Nanotechnology Initiative)
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from article Assessing risks from nanomaterials
Comprehensive environmental assessment (CEA) structure.
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from article Animal testing
Mice are the most commonly used vertebrate species in animal testing and research. (Credit: Dolores Bonaparte)
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from article Animal testing
The use of animals in biomedical research remains essential, but the handling of these sentient beings must be done humanely to minimize and prevent animal harm. (Credit: U.S. Department of Agriculture)
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from article Common cold
Adenovirus structure. An adenovirus binds to the host cell via its fiber through the knob at the end of the fiber "spikes" on the capsid (protein coat) surface. (Credit: M. K. Cowan and H. Smith; copyright © McGraw Hill)
