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from article Civet
Owston's palm civet (Chrotogale owston). (Photo copyright © by Mark Kostich)
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from article Medical waste
The uniform international biohazard symbol.
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from article Patellogastropoda
Whitecap limpet (Acmaea mitra). (Photo by Douglas Eernisse)
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from article Patellogastropoda
Ribbed Mediterranean limpet (Patella ferruginea). (Photo by Georgina Rivera Ingraham)
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from article Patellogastropoda
Radula of the patellogastropod Notoacmea scapha.
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from article Huntington's disease
Huntington's disease is a hereditary disorder that affects approximately five to ten of every 100,000 persons. The average age at onset is between 35 and 40 years. Invariably fatal, the disease progresses gradually over time. (Copyright ©…
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from article Cheese
Cheese being placed in brining tank (salt bath). (Credit: Westend61/Getty Images)
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from article Cheese
Cheese ripening. (Credit: Tom Paiva Photography/Blend Images)
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from article Cheese
Swiss cheese. (Credit: Tom Paiva Photography/Blend Images)
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from article Ion beam mixing
Ion beam mixing of film and substrate. (a) Before ion bombardment. (b) Partial intermixing. (c) Complete intermixing.
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from article Ion beam mixing
Ion beam mixing of alternating films.
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from article Bicosoecida
A bicosoecid, Codomonas annulata.
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from article Rhizocephala
Loxothylacus texanus (arrow) attached to the abdomen of the blue crab (Callinectes sapidus). (After E. G. Reinhard, Parasitic castration of Callinectes, Exp. Parasitol., 5:79–107, 1956)
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from article Polychaeta
Examples of polychaetes. (a) Platynereis dumerilii antipoda. (b) Branchiomma sp. (c) Arenicola bombayensi. (After P. L. Beesley et al., 2000)
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from article Polychaeta
Platynereis dumerilii antipoda, showing the antero-dorsal end with the pharynx everted. (After P. L. Beesley et al., 2000)
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from article Polychaeta
Hololepidella laingensis; scanning electron microscope view of the anterior end with the pharynx everted. An: antennae; Pa: palps; Prb: proboscis; Prs: prostomium; TeC: tentacular cirrus. Numbers refer to the segments of the trunk. Magnification,…
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from article Polychaeta
Gastrolepidia clavigera; scanning electron microscope view of the anterior end. Mo: mouth; Ja: jaw; Pa: palps; Prb: proboscis. Magnification, 30×.
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from article Polychaeta
Gastrolepidia clavigera, scanning electron microscope view of the two first parapodia (Pa1, Pa2). Ch: chaetae; Ci: cirrus; Nop: notopodium; Nep: neuropodium. Magnification, 40×.
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from article Polychaeta
Section through a polychaete. (After E. E. Ruppert and R. D. Barnes, Invertebrate Zoology, Saunders College Publishing, Orlando, 1994)
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from article Hazardous waste
Inspector determining the compliance status of a facility that generates and handles hazardous waste. (Credit: West Virginia Department of Environmental Protection)
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from article Lignin-degrading fungi
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from article Lignin-degrading fungi
Close-up view of Pleurotus spp. fruiting bodies growing naturally on a dead tree log. The common name of oyster mushroom comes from the shell-like appearance of the fruiting body. Note the characteristic eccentric caps.
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from article Chaetonotida
Marine gastrotrichs of the order Chaetonotida; dorsal views. (a) Xenotrichula (courtesy of W. D. Hummon). (b) Chaetonotus (after W. D. Hummon, Intertidal marine Gastrotricha from Colombia, Bull. Mar. Sci., 24:396–408, 1974).
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from article Azeotropic distillation
Schematic representation of the residue curve map for nonazeotropic ternary mixtures.
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from article Azeotropic distillation
Schematic representation of the residue curve maps for ternary mixtures with one minimum-boiling binary azeotrope. (a) Azeotrope between the lowest- and highest-boiling components. (b) Azeotrope between the intermediate- and highest-boiling…
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from article Azeotropic distillation
Classical extractive distillation of ethanol and water using ethylene glycol as entrainer. (a) Residue curve map. Temperatures shown are the normal boiling points of the pure components and the azeotrope. Binary azeotropic composition is not drawn…
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from article Azeotropic distillation
Typical sequence of columns for heterogeneous azeotropic distillation, for example, ethanol + water + benzene (entrainer).
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from article Capability maturity modeling
Capability Maturity Models: the continuous representation.
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from article Capability maturity modeling
Organizational maturity levels.
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from article Capability maturity modeling
Capability Maturity Models: the staged representation.
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from article Capability maturity modeling
CMMI model evolution.
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from article Energy storage
Specific range of vehicles using energy stored in various forms. 1 mi/ft3 = 57 km/m3.
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from article Energy storage
Concept of an underground pumped hydroelectric storage system.
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from article Energy storage
Schematic diagram of compressed-air storage plant at Huntorf, Germany.
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from article Energy storage
Schematic diagram of zinc-chloride battery, showing two main compartments in the design, the battery stack and the chlorine hydrate store. (a) Charge cycle. (b) Discharge cycle. (Gulf and Western Co.)
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from article Energy storage
Impact of solar-electric generation on utility load curve during a typical 24-h period.
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from article Sterilization
Diagrammatic sketch of an autoclave. (American Sterilizer Co.)
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from article Sterilization
Cobalt-60 furnace which is designed for experimental food sterilization.
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from article Sterilization
Van de Graaff generator principle; packaged products sterilized by means of a high-intensity electron beam which penetrates packages. (After W. M. Urbain, Food Eng., vol. 25, February 1953)
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from article Skink
Five-lined skink (Plestiodon fasciatus; formerly Eumeces fasciatus). (Credit: George W. Robinson; copyright © California Academy of Sciences)
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from article Food allergy
Children (under the age of 18) who experience food allergies are more likely to experience other allergic conditions, including asthma (black), eczema/skin allergy (blue), and respiratory allergy (green). (Credit: National Center for Health…
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from article Food allergy
Allergic responses (immunological responses mediated by the IgE class of immunoglobulins) can be caused by certain foods. In a person with allergies, mast cells will be coated with IgE against one or a few antigens (allergens) that, upon entering…
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from article Food allergy
Peanuts are a common trigger of food allergies in both adults and children. (Credit: Christian Jung/Shutterstock)
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from article Machining
Broach cutting a small chip from a workpiece.
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from article Machining
Critical items on a drill point and their geometry. (a) End view. (b) Side view. (c) Side view, with drill rotated 90° about its axis from the position shown in b.
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from article Machining
Formation of turning chips as a single-point tool contacts the exterior of the spinning workpiece.
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from article Machining
Action of a grinding wheel, showing how individual grains of the wheel produce chips from a workpiece.
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from article Machining
Configuration of a centerless grinding wheel.
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from article Machining
Creep-feed grinding process.
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from article Machining
Electric-discharge, or electric-spark, machining process. (Elox Corporation of Michigan)
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from article Machining
Gear hobbing operation; rotation of the hob and gear blank is synchronized and continuous. (After J. G. Bralla, ed., Handbook of Product Design for Manufacturing, McGraw-Hill, 1986)
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from article Ventilation
Roof exhausts for natural ventilation. (a) Cross section of round ventilator and (b) of rotating-head ventilator. (c) Continuous roof ventilator.
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from article Ventilation
Building cross section illustrating motivating convection head (height) for natural ventilation.
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from article Ventilation
Factory-assembled ventilating unit.
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from article Ventilation
Mechanically powered roof air supply unit. For summer ventilation, the portion shown in solid lines is used. Heater and dampers are for winter use. Diffuser outlet improves air distribution into ventilated space.
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from article Sport-related concussion
Sport-related concussion is among the most frequent injuries experienced by athletes participating in contact and collision sports, including football. (Credit: skynesher/Getty Images)
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from article Sport-related concussion
Medical imaging and scanning techniques can identify the brain areas affected by a sport-related concussion. (Credit: Puwadol Jaturawutthichai/Shutterstock)
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from article Sport-related concussion
A football helmet with anticoncussion padding. This type of helmet is recommended for youths who are active in contact and collision sports. (Copyright © McGraw-Hill Education)
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from article Ephemeroptera
Ephemeroptera. (a) Mayfly, adult male, Hexagenia sp., in usual resting position (after A. H. Morgan, Field Book of Ponds and Streams, G. Putnam's Sons, 1930). (b) Mayfly, subadult male, Callibaetis sp., newly emerged from water, standing on surface…
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from article Prairie dog
Black-tailed prairie dogs (Cynomys ludovicianus). (Photo by Ron Singer, U.S. Fish and Wildlife Service)
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from article Hydraulic actuator
Function of a hydraulic double-acting cylinder.
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from article Hydraulic actuator
Types of hydraulic cylinder (linear) actuators. (a) Single-acting, external return. (b) Single-acting, spring return. (c) Telescopic. (d) Double-acting double-ended rod. (e) Tandem cylinders.
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from article Hydraulic actuator
Piston-rack type rotary actuator.
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from article Hydraulic actuator
Single-vane rotary actuator.
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from article Hydraulic actuator
Gear motor rotary actuator.
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from article Hydraulic actuator
Vane motor rotary actuator.
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from article Percopsiformes
Trout-perch (Percopsis omiscomaycus). (Photo by Konrad P. Schmidt)
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from article Percopsiformes
Pirate perch (Aphredoderus sayanus). (Photo by Konrad P. Schmidt)
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from article Percopsiformes
Ozark cavefish (Amblyopsis rosae). (Photo courtesy of U.S. Fish and Wildlife Service)
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from article Prosobranchia
Common gastropods. (Top left) Murex troscheli. (Middle) Conus gloriamaris. (Top right) Lambis crocata. (Bottom) Angaria vicdani.
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from article Nuclear power
Aerial view of a nuclear power plant with one cooling tower (at right). The containment structure housing the nuclear reactor and its fissile uranium fuel is the gray, domed structure rising above the rest of the support buildings at center.…
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from article Nuclear power
Advanced boiling-water reactor (ABWR), the first advanced light-water reactor to be deployed commercially. (Credit: General Electric)
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from article Nuclear power
Aerial image of the stricken Fukushima Daiichi nuclear power plant, showing damaged reactor buildings. (Credit: Department of Energy Aerial Measuring System)
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from article Sauropterygia
Ceresiosaurus calcagnii, ventral view.
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from article Alcohol
Ethanol production plant. (Credit: Julie Kendall/Getty Images)
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from article Alcohol
E85 is a gasoline-ethanol blend containing 51 to 83% ethanol. It is used in flexible-fuel vehicles, which can operate on gasoline or blends of gasoline and ethanol. About 20 million flexible-fuel vehicles are operating in the United States. (Credit:…
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from article Fingerprint identification
Typical inked fingerprint.
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from article Fingerprint identification
FBI fingerprint impressions from the investigation train bombing, March 22, 2004, Madrid Spain. (a) Charted fingerprint collected from Mayfield. (b) Charted latent finger print from the crime scene.
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from article Taxonomy
Taxonomies are hierarchical classifications of groups within groups. As an example, the common taxonomic ranks (domain, kingdom, phylum, subphylum, class, order, family, genus, and species) and their respective names for the eastern gray squirrel…
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from article Taxonomy
Taxonomies can be based on traditional phylogenies and cladistic classifications. (Copyright © McGraw-Hill Education)
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from article Gate circuit
Switch circuit architecture. (a) CMOS transmission gate, with an NMOS and a PMOS transistor in parallel, clocked at opposite clock signals (C and ). (b) Switch circuit for two-input logic AND function, with two normally-OFF switches in series and…
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from article Gate circuit
Logic symbols and corresponding gate circuits. (a) CMOS inverter circuit built with a PMOS and an NMOS transistor. (b) Two-input NAND circuit.
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from article Gate circuit
Emitter-coupled logic (ECL) two-input OR/NOR circuit, consisting of a differential pair.
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from article Zebu
Gray Brahman bull (Bos indicus). (Photo courtesy of Salinas Ranch, Carmine, Texas)
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from article Desertification
Overgrazing on North American rangelands contributes to soil compaction and alters the composition of vegetation. (Credit: Thomas Wikle)
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from article Desertification
Desertification can be accelerated by cultivation in areas better suited for herding, such as this field in Ethiopia. (Credit: Thomas Wikle)
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from article Desertification
Grazing animals have contributed to desertification in Africa’s Sahel region. (Credit: Thomas Wikle)
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from article Engine lubrication
Pressurized lubricating system for an automobile engine. Arrows show the flow of oil through the engine. (Toyota Motor Sales U.S.A. Inc.)
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from article Binocular vision disorders
Exotropia (simulated photographically) is a misalignment of the eyes. In this type of manifest strabismus, one or both eyes turn outward. (Credit: Kerri McTigue)
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from article Binocular vision disorders
Esotropia (crossed eyes; simulated photographically) is a type of manifest strabismus in which one or both eyes turn inward. (Credit: Kerri McTigue)
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from article Commutation
Basic commutator for a dc motor.
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from article Commutation
Three-phase converter.
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from article Ship salvage
USNS Safeguard (T-ARS 50). (U.S. Navy)
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from article Ship salvage
Beach-gear deployment. Beach gear enables a stranded ship to assist in pulling itself into deep water. 1 fathom = 1.8 m; 8000 lb = 3600 kg; 30 ft = 9 m; 1–5/8 in. = 41 mm; 5/8 in. = 16 mm.
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from article Ship salvage
Parbuckling technique, used to right a ship that is on its side or capsized. Wires are passed from the uppermost deck edge, around under the hull, and to a source of lift. Tensioning the wires rolls the ship upright, and it can then be raised by…
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from article Ship salvage
Lift craft operation. (a) At low tide, the lift craft are ballasted down, and cables are passed beneath the sunken vessel and pulled tight. (b) At high tide, the lift craft are deballasted, and the sunken vessel is raised above the ocean bottom and…
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from article Synaptic transmission
Synaptic transmission enables a neuron to communicate with a target cell across a synapse. During synaptic transmission, a presynaptic neuron releases a neurotransmitter, which then binds to specific postsynaptic receptors. (Copyright © McGraw Hill)
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from article Synaptic transmission
Types of synapses: (a) an electrical synapse, showing the plasma membranes of the presynaptic and postsynaptic cells linked by gap junctions; (b) a chemical synapse, showing neurotransmitters released by the presynaptic cell diffusing across the…
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from article Synaptic transmission
Ultrastructure of exocytosis at the neuromuscular junction. (a) Thin-section electron micrograph of a neuromuscular junction from the sartorius muscle of a resting frog. Vesicles are clustered in the presynaptic terminal at one of many active zones;…
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from article Noradrenergic system
Chemical structure of norepinephrine (C8H11NO3).
