Image
from article Vibrotaction
Block diagram of apparatus for determining vibrotactile perception thresholds at the fingertip.
Search Results
Search Results
Refine this search
Search result paging links
5,885 results
Image
from article Vibrotaction
Tactogram showing the approximate maximum threshold recorded at the fingertips of healthy persons (horizontal line), and examples of two types of threshold elevation (reduction in acuity) at selected frequencies (circles and squares).
Image
from article Forest ecosystem
Forest in Moran State Park on Orcas Island, Washington. (Credit: Chris Willig)
Image
from article Forest ecosystem
Forest fire in No Name Creek area of Colorado. (Credit: Andrea Booher/FEMA)
Image
from article Forest ecosystem
Puma and cub in forest. (Credit: Grant Faint/Stockbyte/Getty Images)
Image
from article Forest ecosystem
Conceptual model of elemental cycling in a terrestial ecosystem, emphasizing the presence and activities of arthropod consumers. The indirect regulation of elemental movement by arthropods is indicated by the hourglass-shaped valves on these flows.…
Image
from article Forest ecosystem
The southern pine beetle (Dendroctonus frontalis) is a destructive insect pest of coniferous forests in the southern United States. (Credit: U.S. Forest Service)
Image
from article Forest ecosystem
Belowground food web. (Credit: Elaine Ingham)
Image
from article Vampyromorpha
Vampyroteuthis infernalis (vampire squid) living in the oxygen-minimum zone of Monterey Bay, California, at depths of 600–900 m (1970–2950 ft). (Photo courtesy of Kim Reisenbichler, Monterey Bay Aquarium Research Institute, Moss Landing, CA)
Image
from article Vampyromorpha
Vampyroteuthis infernalis (vampire squid) showing sensory filaments and photophores (light organs).
Image
from article Civet
Owston's palm civet (Chrotogale owston). (Photo copyright © by Mark Kostich)
Image
from article Patellogastropoda
Whitecap limpet (Acmaea mitra). (Photo by Douglas Eernisse)
Image
from article Patellogastropoda
Ribbed Mediterranean limpet (Patella ferruginea). (Photo by Georgina Rivera Ingraham)
Image
from article Patellogastropoda
Radula of the patellogastropod Notoacmea scapha.
Image
from article Beef cattle production
Angus bull with overall carcass merit. (Credit: Jim Koch/Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Beef cattle production
Brahman (zebu) bull (Bos indicus). (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Beef cattle production
An exemplary purebred Hereford bull. (Credit: Michael MacNeil/Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Beef cattle production
A group of Simmental cows. (Credit: Iowa Beef Industry Council)
Image
from article Beef cattle production
Three Charolais heifers. (Credit: Darcy Vial/Farm Service Agency, U.S. Department of Agriculture)
Image
from article Beef cattle production
In order to attain market weight, cattle are fed often in feedlots. (Credit: Dave Hughes/Getty Images)
Image
from article Beef cattle production
In the United States, beef animals used for food must be inspected extensively pre- and postmortem by federal officials. (Credit: Bob Nichols/U.S. Department of Agriculture)
Image
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 ©…
Image
from article Cheese
Cheese being placed in brining tank (salt bath). (Credit: Westend61/Getty Images)
Image
from article Cheese
Cheese ripening. (Credit: Tom Paiva Photography/Blend Images)
Image
from article Cheese
Swiss cheese. (Credit: Tom Paiva Photography/Blend Images)
Image
from article Fruit, tree
Apple trees growing in an orchard. (Photo by Charles Rondeau)
Image
from article Fruit, tree
Apple scab on fruit. This disease, caused by the fungus Venturia inaequalis, leads to unsightly blemishes on ripe apples. (Photo courtesy of the University of Georgia Plant Pathology Archive)
Image
from article Fruit, tree
Brown rot, caused by the fungus Monilinia fructicola, on a peach. (Photo by Jonas Janner Hamann, Universidade Federal de Santa Maria, Brazil)
Image
from article Fruit, tree
Fire blight, caused by the bacterium Erwinia amylovora, on apple fruits and leaves. (Photo courtesy of the University of Georgia Plant Pathology Archive)
Image
from article Fruit, tree
Blue mold (Penicillium italicum) on a rotting orange. (Photo by G. L. Barron)
Image
from article Bicosoecida
A bicosoecid, Codomonas annulata.
Image
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)
Image
from article Belladonna
Close-up view of the belladonna plant (Atropa belladonna), showing the leaves and berries, which are toxic. (Credit: Leo Michels)
Image
from article Masking of sound
Three psychophysical tuning curves, showing the tonal masking effects for tonal signals of 300, 1000, or 3000 Hz. (After F. L. Wightman et al. Factors influencing frequency selectivity in normal and hearing-impaired listeners, in E. F. Evans and J.…
Image
from article Masking of sound
Width of the critical band in hertz as a function of signal frequency.
Image
from article Masking of sound
Relative amount of masking obtained in forward, simultaneous, and backward masking. (After W. A. Yost, Fundamentals of Hearing: An Introduction, 4th ed., Academic Press, New York, 2000)
Image
from article Masking of sound
Masking of a 1000-Hz pure-tone signal in forward masking when the masker is a two-tone complex consisting of a 1000-Hz masker and a second tone. (a) Threshold of signal for the two-tone masker relative to that obtained when only the 1000-Hz tone…
Image
from article Polychaeta
Examples of polychaetes. (a) Platynereis dumerilii antipoda. (b) Branchiomma sp. (c) Arenicola bombayensi. (After P. L. Beesley et al., 2000)
Image
from article Polychaeta
Platynereis dumerilii antipoda, showing the antero-dorsal end with the pharynx everted. (After P. L. Beesley et al., 2000)
Image
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,…
Image
from article Polychaeta
Gastrolepidia clavigera; scanning electron microscope view of the anterior end. Mo: mouth; Ja: jaw; Pa: palps; Prb: proboscis. Magnification, 30×.
Image
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×.
Image
from article Polychaeta
Section through a polychaete. (After E. E. Ruppert and R. D. Barnes, Invertebrate Zoology, Saunders College Publishing, Orlando, 1994)
Image
from article Lignin-degrading fungi
Image
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.
Image
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).
Image
from article Lychee
Fruit and leaves of lychee (Litchi chinensis). (Photo courtesy of Forest and Kim Starr)
Image
from article Star tracker
Strapdown satellite star tracker. (a) Mounting of system on the satellite. (b) Star tracker in housing. (Northrop Grumman Corp.)
Image
from article Star tracker
Silicon focal-plane arrays. (Northrop Grumman Corp.)
Image
from article Sterilization
Diagrammatic sketch of an autoclave. (American Sterilizer Co.)
Image
from article Sterilization
Cobalt-60 furnace which is designed for experimental food sterilization.
Image
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)
Image
from article Nerve agent
Chemical structure of the nerve agent tabun (GA), C5H11N2O2P.
Image
from article Nerve agent
An example of hazardous materials workers wearing personal protective equipment (PPE), as might be worn to protect against nerve agent exposure. (Credit: CDC Public Health Image Library)
Image
from article Nerve agent
A practice exercise at the Centers for Disease Control and Prevention showing responders using a decontamination station, as might be used after a nerve agent incident. (Credit: CDC Public Health Image Library/Kathy Nellis Chastney)
Image
from article Nerve agent
Example of auto-injector syringes for atropine and pralidoxime, two antidotes for nerve agent exposure, from a Mark 1 Nerve Agent Antidote Kit (NAAK). (Credit: ATSDR/CDC)
Image
from article Skink
Five-lined skink (Plestiodon fasciatus; formerly Eumeces fasciatus). (Credit: George W. Robinson; copyright © California Academy of Sciences)
Image
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…
Image
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…
Image
from article Food allergy
Peanuts are a common trigger of food allergies in both adults and children. (Credit: Christian Jung/Shutterstock)
Image
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)
Image
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)
Image
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)
Image
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…
Image
from article Prairie dog
Black-tailed prairie dogs (Cynomys ludovicianus). (Photo by Ron Singer, U.S. Fish and Wildlife Service)
Image
from article Streptococcus pneumoniae (pneumococcus)
Photomicrograph of Streptococcus pneumoniae bacteria that have been grown from a blood culture. Streptococcus pneumoniae is the most common bacterial cause of pneumonia in adults, but various forms of the bacteria have acquired resistance to…
Image
from article Percopsiformes
Trout-perch (Percopsis omiscomaycus). (Photo by Konrad P. Schmidt)
Image
from article Percopsiformes
Pirate perch (Aphredoderus sayanus). (Photo by Konrad P. Schmidt)
Image
from article Percopsiformes
Ozark cavefish (Amblyopsis rosae). (Photo courtesy of U.S. Fish and Wildlife Service)
Image
from article Prosobranchia
Common gastropods. (Top left) Murex troscheli. (Middle) Conus gloriamaris. (Top right) Lambis crocata. (Bottom) Angaria vicdani.
Image
from article Sauropterygia
Ceresiosaurus calcagnii, ventral view.
Image
from article Fingerprint identification
Typical inked fingerprint.
Image
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.
Image
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…
Image
from article Taxonomy
Taxonomies can be based on traditional phylogenies and cladistic classifications. (Copyright © McGraw-Hill Education)
Image
from article Zebu
Gray Brahman bull (Bos indicus). (Photo courtesy of Salinas Ranch, Carmine, Texas)
Image
from article Desertification
Overgrazing on North American rangelands contributes to soil compaction and alters the composition of vegetation. (Credit: Thomas Wikle)
Image
from article Desertification
Desertification can be accelerated by cultivation in areas better suited for herding, such as this field in Ethiopia. (Credit: Thomas Wikle)
Image
from article Desertification
Grazing animals have contributed to desertification in Africa’s Sahel region. (Credit: Thomas Wikle)
Image
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)
Image
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)
Image
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)
Image
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…
Image
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;…
Image
from article Noradrenergic system
Chemical structure of norepinephrine (C8H11NO3).
Image
from article Noradrenergic system
The relationship between norepinephrine and G proteins. Binding of norepinephrine to a receptor leads to activation of G proteins, which in turn modulate the activity of other proteins (enzymes or ion channels) in the cell. Terms: ATP, adenosine…
Image
from article Laminariales
Laminaria: (a) sporophyte; (b) cross section of blade, showing a sorus of unilocular sporangia interspersed with sterile hairs (paraphyses); (c) zoospore; (d) male gametophyte with antheridia; (e) antherozoid (sperm); (f) female gametophyte with…
Image
from article Laminariales
Giant kelp (Macrocystis pyrifera) can grow up to 0.6 m (2 ft) per day. Note the series of frond blades, with each subtended by a bladder. (Photo courtesy of Charlotte Stevenson, University of Southern California Sea Grant, Los Angeles)
Image
from article Biosynthesis
Biosynthetic relationships of some natural products. Specific examples which belong to the various classes are given in brackets.
Image
from article Diadematoida
Two ambulacral plates of Diadema. (After T. Mortensen, A Monograph of the Echinoidea, III, C. A. Reitzel, Copenhagen, 1943)
Image
from article Diadematoida
Diadema antillarum on coral reef. Spines are commonly black, but white spines, as shown here, are also frequently found. (Photo courtesy of J. E. Miller)
Image
from article Epidermal ridges
Characteristics of individual ridges and their configurations, seen in a print. (After H. Cummins and C. Midlo, Fingerprints: Palms and Soles, McGraw-Hill, 1943)
Image
from article Valvatida
Valvatid pedicellariae (valvate type) on marginal plates of Hippasteria trojana.
Image
from article Valvatida
Three-dimensional diagram showing the main ossicles of the valvatid arm.
Image
from article Obesity
Map of the United States showing the growing prevalence of obesity. In general, the South had the highest prevalence of obesity, followed by the Midwest, the Northeast, and the West. (Credit: U.S. Centers for Disease Control and Prevention)
Image
from article Obesity
Colored scanning electron micrograph (SEM) of fat (adipose) tissue. The round fat cells (adipocytes) are surrounded by collagen fibers. Lipid is colored purple. Empty cells are seen at top right. (Credit: Science Photo Library/Alamy Stock Photo)
Image
from article Obesity
Estimated percentage of obesity according to gender. Dark color indicates the percentage of obesity in females; light color indicates the percentage of obesity in males. (Credit: National Institute of Diabetes and Digestive and Kidney Diseases,…
Image
from article Remipedia
Representative Remipedia. (a) Speleonectes lucayensis (after F. R. Schram, Crustacea, Oxford University Press, New York, 1986). (b) Lasionectes entrichoma [after J. Yager and F. R. Schram, Lasionectes entrichoma, new genus, new species (Crustacea:…
Image
from article Parasympathetic nervous system
Overview of parasympathetic pathways of the human autonomic nervous system. Preganglionic axons from the brain and spinal cord innervate the viscera in the head, neck, and trunk. (Copyright © McGraw Hill)
Image
from article Fertilization (animal)
Photomicrograph (tinted green) of mouse sperm bound to the zona pellucida of an unfertilized egg under laboratory conditions (in vitro). (Credit: K. O. Kalthoff)
