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from article Herrings
A composite herring. (Illustration courtesy of the Food and Agriculture Organization of the United Nations)
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from article Herrings
Three clupeid juveniles: (top) Atlantic herring (Clupea harengus); (middle) blueback herring (Alosa aestivalis); and (bottom) alewife (Alosa pseudoharengus). (Photo courtesy of Justin Stevens, Northeast Fisheries Science Center, National Oceanic and…
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from article Herrings
Gulf menhaden (Brevoortia patronus). (Photo courtesy of the SEFSC Pascagoula Laboratory, Collection of Brandi Noble, Southeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration)
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from article Herrings
Spanish sardine or round sardinella (Sardinella aurita). (Photo courtesy of the SEFSC Pascagoula Laboratory, Collection of Brandi Noble, Southeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric…
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from article Light-scattering techniques
Simplified interpretation of light scattering by a particle.
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from article Light-scattering techniques
Light-scatter measurement from particle suspensions.
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from article Tungsten
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from article Tungsten
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from article Cocoa powder and chocolate
Cocoa pods on tree. (Credit: Norman Chan/Shutterstock)
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from article Cocoa powder and chocolate
Cocoa beans, powder, and chocolate. (Credit: Fcafotodigital/iStock/Getty Images)
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from article Cocoa powder and chocolate
Chocolate production line. (Credit: ©bogdanhoda/Shutterstock)
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from article Space navigation and guidance
Jupiter flyby of a space probe in (a) Jupiter's frame of reference and (b) the Sun's frame of reference.
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from article Tunicata
Polycarpa aurata, commonly referred to as the ox heart ascidian, is a tunicate native to the tropical Indo-Pacific region. (Credit: Dwayne Meadows/National Oceanic and Atmospheric Administration)
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from article Tunicata
Representative members of Tunicata: (a) Doliolum, a planktonic thaliacean; (b) Oikopleura, a planktonic appendicularian (larvacean) with a tail, removed from its house. (Credit: P. A. Meglitsch and A. Alldredge)
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from article Carpal tunnel syndrome
The carpal tunnel is a thin passageway among ligaments, muscles, and tendons located in the wrist on the anterior (palm) side of the hand. Compression of the median nerve, which courses through the carpal tunnel, can lead to carpal tunnel syndrome.…
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from article Myodocopida
Morphology of a typical myodocopid ostracode, an adult female of Cypridina norvegica Baird, viewed from the left side with the left valve removed. (Modified from R. C. Moore, ed., Treatise on Invertebrate Paleontology, pt. Q, Arthropoda, University…
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from article Myodocopida
Morphology of both sexes of Conchoecia elegans Sars, viewed from the left side with the left valve removed. (a) Adult female with eggs. (b) Adult male. (Modified from R. C. Moore, ed., Treatise on Invertebrate Paleontology, pt. Q, Arthropoda,…
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from article Alfalfa
Trifoliolate leaves of alfalfa (Medicago sativa). (Photo by Patrick J. Alexander; USDA-NRCS PLANTS Database)
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from article Alfalfa
Flowering alfalfa (Medicago sativa). (Photo by Scott Bauer, Agricultural Research Service, United States Department of Agriculture)
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from article Alfalfa
Cut alfalfa during a harvesting operation in Colorado. (Photo by Howard F. Schwartz, Colorado State University)
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from article Alfalfa
Alfalfa plants affected by symptoms of verticillium wilt. (Photo by William M. Brown, Jr.; Bugwood.org)
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from article Alfalfa
Alfalfa leaf spot caused by Pseudopeziza medicaginis (a fungal plant pathogen). (Photo courtesy of the University of Georgia Plant Pathology Archive; Bugwood.org)
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from article Prussian blue
Prussian blue.
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from article Legume
A variety of legumes. Clockwise from top right: Lentils, fenugreek seeds, fava beans, tepary beans, scarlet runner beans, lupini beans, tarwi beans, and fava bean pods. (Photo by Keith Weller, Agricultural Research Service, U.S. Department of…
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from article Coleoidea
Octopus Benthoctopus photographed by the deep-submergence vehicle ALVIN at a depth of 2770 m (9088 ft), Gorda Ridge, Northeast Pacific Ocean.
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from article Moose
Bull moose (Alces alces). (Photograph courtesy of Jeff Foott/National Park Service)
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from article Cavies
Guinea pig (Cavia porcellus). (Photo courtesy of Anne Moss)
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from article Lime (botany)
Fruit and leaves of the lime (Citrus aurantifolia). (Photograph courtesy of Forest and Kim Starr)
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from article Rickettsioses
Coxiella burnetii (shown in yellow color), the causative bacterial agent of the rickettsial disease (rickettsiosis) known as Q fever, in an infected cell. (Photo courtesy of Robert Heinzen, Elizabeth Fischer, and Anita Mora, National Institute of…
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from article Polarographic analysis
Diagram showing components of a polarographic circuit.
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from article Polarographic analysis
Polarographic current-voltage curves: 1 = supporting electrolyte; 2 = curve in the presence of an electroactive (reducible) compound; E1/2 = half-wave potential; i lim = limiting current (wave height).
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from article Maternal behavior
In this display of maternal behavior, a mother robin pauses while feeding her three chicks. (Credit: Paul Mozell/Alamy Images)
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from article Maternal behavior
The mother cow is responsible for providing milk for the young calf. (Credit: Anjo Kan/Shutterstock)
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from article Notacanthoidei
Spiny eel (Notacanthus abbotti). (Photo courtesy of K. T. Shao, Taiwan Fish Database)
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from article Entodiniomorphida
Ophryoscolex, an entodiniomorphid.
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from article Myrmecochory
A carpenter ant, Camponotus castaneus, carrying a wild ginger seed in the southeastern United States. (Photo by Katharine L. Stuble)
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from article Myrmecochory
Polygala grandiflora seed with elaiosome. This plant species is dispersed by ants in the southeastern United States. (Photo by Katharine L. Stuble)
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from article Amalgam
Tooth with a dental amalgam filling. (Credit: Szasz-Fabian Jozsef/Shutterstock.com)
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from article Amaranth
Amaranth (Amaranthus) flowers and leaves. (Photo by Howard F. Schwartz, Colorado State University)
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from article Virus
Computer-generated representations of viruses. The protein coats of the viruses are shown in three dimensions. (a) Norwalk virus. (b) Front view: Southern bean mosaic virus. (c) Adenovirus. (d) Ross River virus. [Credit: (a, b, c) Richard J.…
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from article Virus
Colorized negative-stained transmission electron micrograph (TEM) of the swine flu virus. (Credit: C. S. Goldsmith and A. Balish/U.S. Centers for Disease Control and Prevention)
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from article Virus
Colorized transmission electron micrograph (TEM) reveals some of the ultrastructural morphology displayed by an Ebola virus virion. (Credit: Frederick A. Murphy/U.S. Centers for Disease Control and Prevention)
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from article Virus
Digitally generated view of the internal structure of the human immunodeficiency virus (HIV). (Credit: MedicalRF)
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from article Virus
Diagram depicting the viral processes involved in the AIDS life cycle. The human immunodeficiency virus (HIV-I) enters the T-lymphocyte cell, where the virus loses its outer envelope, releasing its RNA and its reverse transcriptase. The reverse…
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from article Genetic dominance
The crossing of tall (dominant AA) and short (recessive aa) homozygous plants in the parent (P1) generation leads to tall heterozygotes (Aa) in the F1 generation of offspring. This is an example of genetic dominance. In the F2 generation, three…
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from article Genetic dominance
The production of phenotypes that are intermediate between those of the parents is an example of partial or incomplete dominance. In this illustration, plants with red flowers crossed to plants with white flowers produce pink offspring in the F1…
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from article Genetic dominance
In codominance, both the dominant and recessive alleles are expressed in heterozygous individuals. The visible expression of a gene is known as the phenotype, whereas the genetic constitution of an individual is known as its genotype. (Copyright ©…
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from article Argentiniformes
Herring smelt (Argentina georgei). (Photo courtesy of the SEFSC Pascagoula Laboratory, Collection of Brandi Noble, Southeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration)
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from article Shrew
Dusky shrew (Sorex monticolus obscurus), native to western North America. (Photo by Lloyd Glenn Ingles; copyright © California Academy of Sciences)
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from article Basses
Largemouth bass (Micropterus salmoides). (Photo courtesy of Ken Hammond/USDA)
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from article Basses
Chalk bass (Serranus tortugarum). (Photo courtesy of John E. Randall)
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from article Phasmatodea
Walking stick insect. (Photo courtesy of National Park Service)
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from article Molecular orbital theory
In-phase and out-of-phase addition of atomic hydrogen wave functions (x1, x2) to give (a) bonding and (b) antibonding molecular orbitals.
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from article Molecular orbital theory
Molecular orbital diagram of H2.
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from article Molecular orbital theory
Molecular orbital diagram for a first-row diatomic molecule (A2). The electronic configuration corresponds to that of O2.
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from article Molecular orbital theory
Possible orientations of the p orbitals on adjacent atomic centers. (a) End-on overlap. (b) Sideways overlap. (c) Zero overlap.
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from article Molecular orbital theory
Molecular π orbitals for (a) benzene and (b) cyclobutadiene viewed from above so that the relative phases only of the upper half of the pπ orbitals are shown. (c) The energy of an isolated pπ orbital.
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from article Molecular orbital theory
Molecular orbital diagram for an ML6 transition-metal complex. The labels a1g, eg, t1u, and t2g describe the symmetry properties of the orbital levels.
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from article Molecular orbital theory
Symmetry elements for the H2 or A2 diatomic molecule.
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from article Molecular orbital theory
Orbital correlation diagram for (a) the conrotatory and (b) the disrotatory ring closing of 1,4-butadienes.
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from article Molecular orbital theory
HOMO-LUMO interactions between maleic anhydride and (a) butadiene and (b) ethylene.
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from article Donnan equilibrium
Schematic showing two compartments separated by a semipermeable membrane, (a) before equilibrium and (b) at equilibrium. Originally, the left compartment contains m macroelectrolyte ions (P−n) and its counterions (Na+), in aqueous solution. The…
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from article Chiroptera
Anatomical features of bat. (After R. Peterson, Silently by Night, McGraw-Hill, 1964)
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from article Chiroptera
Skeleton of Pteropus, giant fruit bat (lacking tail). (After R. Peterson, Silently by Night, McGraw-Hill, 1964)
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from article Chiroptera
Eptesicus fuscus (family Vespertilionidae), big brown bat, from Huntington Lake, California. (Photo by Dr. Lloyd Glenn Ingles; copyright © California Academy of Sciences)
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from article Acrotretida
Morphology of dorsal (left) and ventral (right) valve interiors of Ceratreta. [After R. L. Kaesler, ed., Treatise on Invertebrate Paleontology, pt H: Brachiopoda, rev. vol. 2, Geological Society of America/University of Kansas Press, Boulder,…
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from article Acrotretida
Ceratreta hebes dorsal valve exterior (a, ×18), interior (b, ×18), and oblique interior, illustrating the median septum (c, ×21); ventral valve exterior, apical view (d, ×15), illustrating the slit-like apical foramen, oblique lateral view (e, ×18)…
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from article Alcoholism
Deaths as a result of alcohol poisoning: (left) alcohol poisoning deaths are most common among middle-aged adults; (right) men are approximately three times more likely to die from alcohol poisoning compared to women. (Credit: National Vital…
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from article Alcoholism
Punctate hemorrhages in the mammillary bodies of the brain displaying evidence of Wernicke encephalopathy. This complication is often seen in chronic alcohol abusers and affects thiamine uptake and utilization. (Copyright © McGraw Hill)
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from article Alcoholism
Alcohol dependence or abuse among adults aged 21 years or older within a 12-month period as a function of the age of the individual at the first use of alcohol. (Credit: Substance Abuse and Mental Health Services Administration, U.S. Department of…
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from article Sequoia
Giant sequoia (Sequoiadendron giganteum). The General Sherman Tree, which is the largest (by volume) known tree in the world, is located in Sequoia National Park, California. (Credit: U.S. National Park Service)
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from article Juniper
Branches and evergreen leaves of eastern redcedar (J. virginiana). (Photo courtesy of Forest and Kim Starr)
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from article Juniper
Habit of western juniper (J. occidentalis). (Photo courtesy of Susan McDougall, USDA–NRCS PLANTS Database)
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from article Juniper
Closeup view of Rocky Mountain juniper (J. scopulorum) showing scalelike leaves and berrylike cones. (Photo courtesy of D. E. Herman, North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)
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from article Okra
Okra (Hibiscus esculentus). (Photo courtesy of Forest and Kim Starr)
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from article HeLa cell
Multiphoton fluorescence image of HeLa cells stained with the actin-binding toxin phalloidin (red), microtubules (blue), and cell nuclei (purple). (Credit: Tom Deerinck/National Center for Microscopy and Imaging Research/National Institutes of…
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from article HeLa cell
Time line: HeLa cells have facilitated scientific and medical advancements since 1951. (Copyright © McGraw-Hill Education)
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from article Acetaminophen
The molecular structure of acetaminophen.
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from article Acetaminophen
Production of the metabolite AM404.
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from article Acetaminophen
Production of the metabolite NAPQI.
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from article Holly
American holly (Ilex opaca). (Photo credit: Larry Stritch, USDA Forest Service)
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from article Haemophilus
A rabbit blood culture photomicrograph of Haemophilus ducreyi bacteria using a Gram-stain technique. (Credit: Greg Hammond/Centers for Disease Control and Prevention)
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from article Pycnogonida
Nymphon, external features in dorsal view.
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from article Pycnogonida
Pycnogonum stearnsi, a common littoral pycnogonid of the Pacific Coast.
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from article Pycnogonida
Protonymphon larva, ventral view.
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from article Ciconiiformes
Great blue heron (Ardea herodias), Galápagos Islands, Ecuador. (Photo by H. Vannoy Davis; copyright © California Academy of Sciences)
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from article Varnish tree
Varnish tree (Toxicodendron vernicifluum). To obtain the lacquer, grooves are cut into the bark of the trunk. The exudate (a milky sap) that oozes from these grooves is collected and refined into various types of lacquer. (Photo courtesy of Kintaro…
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from article Heliozoia
Organization of Heliozoia. (a) Actinophryida type. (b) Centrohelida type. (c) Desmothoracida type. (After R. P. Hall, Protozoology, Prentice-Hall, 1953)
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from article Molecular simulation
A lubricant component, squalane (a 30-carbon alkane with a 24-carbon backbone and 6 methyl side groups), is confined to a nanoscale gap created by a surface to which butane molecules have been attached. The visualization depicts the carbons only.…
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from article Molecular simulation
Snapshot from an ab initio molecular dynamics simulation probing the effect of water on the dissociation of acetic acid over Pd(III). The change in binding energy of the acetate anion on Pd(III) in the liquid phase is measured in the simulation to…
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from article Animal flight
Flamingos take flight at the Lake Bogoria National Reserve in Kenya. (Credit: Shutterstock / Kirill Dorofeev)
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from article Animal flight
Aerodynamics of flight. (a) Airflow around a typical wing profile. (b) Pressure distribution around a typical wing profile. (c) The difference in pressure disappears toward the wingtips as trailing vortices in the wake.
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from article Animal flight
The Southern flying squirrel, Glaucomys volans, in flight. (Credit: Nebraska Game and Parks Commission)
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from article Animal flight
Vortex wakes behind a bird in flapping flight and below a hovering bird. (a) In slow flight, vorticity is shed only during the downstroke, resulting in a stack of vortex rings. (b) In faster flight, lift can be generated also during the upstroke,…
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from article Beaver
American beaver (Castor canadensis). (Photo courtesy of Rocky Mountain National Park, Colorado; National Park Service)
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from article Yak
An adult male domestic yak (Bos grunniens). (Credit: Brent Huffman)
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from article Darmstadtium
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from article Darmstadtium
A velocity filter is used as a separator for heavy-ion reaction products (SHIP). Fusion products travel at known velocities and are forced to follow the beam direction. Products are separated and identified by silicon detectors. TOF = time of flight.
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from article Darmstadtium
Sequence of decay chains that document the discovery of darmstadtium. Numbers below boxes are alpha energies and correlation times. Darmstadtium is produced in the reaction 62Ni + 208Pb → 269Ds + 1n.
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from article Rhubarb
Rhubarb (Rheum rhabarbarum or Rheum rhaponticum). (Photo by P. J. Bennett, Lakewood, OH)
