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from article Barracuda
Great barracuda (Sphyraena barracuda). (Photo copyright © John E. Randall)
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from article Circle
A circle, with radius, diameter, and circumference indicated. (Credit: McGraw-Hill Education)
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from article Circle
Nine-point circle and Euler line PMH.
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from article Sonobuoy
Launch of a sonobuoy from an antisubmarine warfare (ASW) aircraft. (a) In flight. (b) Buoy strikes the water in a nearly vertical attitude. (c) Antenna and hydrophone are positioned automatically.
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from article Goat production
Domesticated goats (Capra hircus) raised for meat goat production. (Photo by Susan Boyer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Goat production
Close-up view of a Saanen goat. (Photo by Milan Kořínek)
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from article Goat production
Mechanical (automatic) milking of a purebred Nigerian Dwarf dairy goat on an elevated stand. (Photo courtesy of Lesa Wilke, Bramblestone Farm, Ohio; www.bramblestonefarm.com)
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from article Blowpipe
Glassblower blowing into a blowpipe to shape molten glass. (Credit: Hero Images/Getty Images)
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from article Trihedron
Trihedron and trihedral angles.
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from article Trihedron
Spherical triangle ABC formed by intersection of sphere with a trihedron. The center of the sphere is at the vertex of the trihedron.
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from article Tin
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from article Tin
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from article Xenophyophorida
Xenophyophorids. (a) Stannoma dendroides. (b) Stannophyllum zonarium. (c) Psammetta erythrocytomorpha, section showing interlacing tubules and dark inclusions of uncertain nature.
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from article Isoelectric point
Titration of alanine with sodium hydroxide (NaOH), showing the course of pH with added fractional equivalents. The four arrows show, from left to right, the pKa [½ cations: NH3+(CH3)COOH, and ½ zwitterions: NH3+(CH3)CHCOO−], the pl (all…
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from article Isoelectric point
Course of the charges carried by lysine (pKa = 2.18) molecules in dilute aqueous solution with pH during a titration with alkali. Shown are the net charge, going from +2 at low pH to +1 between pH 4.5 and 6.5, the isoelectric point at pH 9.74, the…
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from article Apple
Empire apple (Malus pumila). (Credit: Peggy Greb/Agricultural Research Service, United States Department of Agriculture)
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from article Apple
Apple trees in an orchard in late autumn. (Credit: Sandrine Bouvier/Alamy)
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from article Wood anatomy
Annual tree rings are distinct features of wood anatomy. The combined concentric bands of light and dark areas can help investigators to determine the age of a tree. (Credit: DrimaFilm/Shutterstock)
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from article Wood anatomy
Light micrograph of a section through the stem of a lime tree (genus Tilia). The pith is at the center and is surrounded by a layer of wood (xylem). A thin cambium separates this from the phloem. An outer layer of collenchyma is enclosed by the…
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from article Wood anatomy
Structure of a typical hardwood. (Credit: U.S. Department of Agriculture)
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from article Wood anatomy
Structure of a typical softwood. (Credit: U.S. Department of Agriculture)
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from article Iridium
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from article Musk-ox
Musk-ox (Ovibos moschatus). (Credit: Brent Huffman/Ultimate Ungulate Images)
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from article Potato
Potato (Solanum tuberosum), also known as the Irish potato. (Credit: Peggy Greb/Agricultural Research Service, U.S. Department of Agriculture)
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from article Potato
Diagram of a potato plant. (Credit: Potato Association of America)
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from article Potato
Potato tubers infected by late blight (caused by Phytophthora infestans). (Credit: G. D. Franc)
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from article Gamma function
Depiction of gamma function Γ(z) for real values of z.
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from article Persian melon
Persian melon (Cucumis melo). (Photo by Mehrdad Aref-Adib)
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from article Marten
American marten (also known as the American pine marten; Martes americana). (Photo by Gerald and Buff Corsi; copyright © California Academy of Sciences)
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from article Absorption
Incident sunlight is absorbed, reflected, and scattered by tree leaves. (Credit: Shutterstock / photolinc)
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from article Bioorganic chemistry
Vancomycin and an analog that is active against vancomycin-resistant bacteria.
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from article Bioorganic chemistry
Foldamers that mimic proteins.
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from article Bioorganic chemistry
The rate of this intramolecular lactonization, relative to that of intermolecular esterification, mimics the rate increase caused by an enzyme's binding and orienting substrates for a bimolecular reaction.
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from article Bioorganic chemistry
Intramolecular models of enzymatic general acid and general base catalysis. (a) Intramolecular general acid catalysis causes this acetal to hydrolyze at pH 7 more than 107 times faster than the corresponding acetal without the carboxylic acid group.…
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from article Bioorganic chemistry
An antibody raised against the phosphonate analog of a tetrahedral intermediate catalyzes the hydrolysis of cocaine to ecgonine methyl ester.
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from article Bioorganic chemistry
A functionalized cyclodextrin mimics the enzyme RNase by catalyzing the regioselective hydrolysis of a model phosphodiester.
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from article Bioorganic chemistry
Enzyme-catalyzed reactions that have been commercialized as industrial processes.
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from article Bioorganic chemistry
Mechanism of DNA scission by calicheamicin. Reductive or nucleophilic cleavage of the trisulfide triggers conjugate (Michael) addition to the enone, rehybridization of the bridgehead carbon, and Bergman cyclization of the enediyne, generating a…
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from article Tanaidacea
Leviapseudes bipartitus. [K. Larsen, Deep-Sea Tanaidacea (Peracarida) from the Gulf of Mexico, Brill, Leiden, 2005]
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from article Tanaidacea
Typhlotanais ohtsukae: (top) female; (bottom) male. [K. Larsen and M. Shimomura, Tanaidacea (Crustacea: Peracarida) from Japan: II. Tanaidomorpha from the East China Sea, the West Pacific Ocean and the Nansei Islands, Zootaxa, 1464:1–43, 2007]
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from article Yeast
Colorized scanning electron micrograph (SEM) of Schizosaccharomyces pombe yeast. This single-celled fungus is studied widely as a model organism for eukaryotic cell division. It is a rod-shaped yeast that grows by elongation at its ends, and it…
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from article Yeast
Cell shapes of yeasts are extremely varied: (a) rectangular; (b) pear-shaped; (c) apiculate; (d) ogival; (e) spherical; (f) globose; (g) ellipsoidal (oval); (h) elongate; (i) tetrahedral. (Copyright © McGraw Hill)
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from article Yeast
Colorized scanning electron micrograph (SEM) of cells of brewer's yeast (Saccharomyces cerevisiae). This yeast consists of single vegetative cells. Small daughter cells can be seen budding off from the larger cells. Saccharomyces cerevisiae ferments…
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from article Yeast
Yeast mycelia: (a) a true septate mycelium showing a break to form an arthrospore; (b) a pseudomycelium. (Copyright © McGraw Hill)
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from article Yeast
Heterothallic (bifactorial) life cycle of a basidiomycetous yeast, Leucosporidium scottii. (Copyright © McGraw Hill)
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from article Yeast
A fluorescent antibody stain reveals the oval budding yeast cells of Candida albicans. This yeast is the most common human fungal pathogen. (Credit: Maxine Jalbert and Leo Kaufman/Centers for Disease Control and Prevention)
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from article Flax
Flax plants (Linum usitatissimum) in bloom. (Photo by Howard F. Schwartz, Colorado State University)
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from article Flax
Flaxseeds. (Photo by Jose Hernandez, U.S. Department of Agriculture–Natural Resources Conservation Service PLANTS Database)
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from article Flax
Yellow wilted leaves of flax plants infected by Fusarium oxysporum. (Photo by J. A. Hoes, Oilseed Diseases Image Collection, Western Committee on Plant Disease, Winnipeg, Manitoba, Canada)
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from article Flax
Blighted and moldy flaxseeds. (Photo by J. A. Hoes, Oilseed Diseases Image Collection, Western Committee on Plant Disease, Winnipeg, Manitoba, Canada)
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from article Beer
Grains of (a) barley before malting and (b) hop plant. (Credit: U.S. Department of Agriculture)
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from article Beer
Fermentation tanks. (Credit: ClarkandCompany/Getty Images)
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from article Cassiduloida
Major features of cassiduloids as shown on a test of Cassidulus caribaearum (a Caribbean species) with spines (upper two figures) and without spines (lower two figures). Top (aboral) views are shown on the left; bottom (oral) views are shown on the…
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from article Peppermint
Peppermint (Mentha piperita). (Credit: Michael Thompson/Agricultural Research Service, U.S. Department of Agriculture)
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from article Liquid chromatography
Chromatogram showing the separation of various ethoxylates (nonionic surfactants) from an environmental water sample by liquid chromatography. EO = ethoxylate. Cx = alkyl. OP = octylphenol. NP = nonylphenol. (Credit: U.S. EPA)
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from article Rhynchosauria
Skull (dorsal view) of the rhynchosaur Paradapedon.
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from article Protist
A flagellated protist belonging to the genus Euglena. (Credit: Richard Gross; copyright © McGraw Hill)
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from article Citron
Citron (Citrus medica), including cross sections of the fruit. (Photo courtesy of California Citrus Clonal Protection Program)
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from article Foodborne disease
Trichrome-stained photomicrograph of a Giardia lamblia trophozoite (a growing stage in the life cycle of certain protozoan parasites). This microorganism often causes giardiasis (a diarrheal foodborne illness). (Credit: Melanie Moser/Centers for…
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from article Foodborne disease
A cluster of norovirus particles. (Credit: Charles D. Humphrey/Centers for Disease Control and Prevention)
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from article Foodborne disease
Colored scanning electron micrograph showing Salmonella enterica bacteria (serotype Typhimurium; colorized red) invading an immune cell (colorized yellow). This bacterial species commonly causes food-associated gastroenteritis. (Credit: National…
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from article Foodborne disease
Close-up view of Campylobacter jejuni bacteria. This scanning electron microscope image shows the characteristic spiral (or corkscrew) shape of C. jejuni cells. (Credit: De Wood and Chris Pooley/Agricultural Research Service, U.S. Department of…
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from article Cabbage
Cabbage (Brassica oleracea var. capitata). (Joseph Harris Co., Inc., Rochester, New York)
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from article Blattodea
American cockroach (Periplaneta americana). (Credit: Antagain/iStockphoto/Getty Images)
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from article Blattodea
The Madagascar hissing roach (Gromphadorhina portentosa) can compress its body and force air through modified spiracles (breathing pores), producing a loud hissing sound. (Credit: Alamy)
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from article Gelatin
Gelatin capsules. (Copyright © Digital Vision/SuperStock)
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from article Gelatin
Gelatin fruit dessert. (Credit: Getty Images/iStockphoto)
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from article Solid-state battery
A researcher holds a sample of a prototype structure for a solid-state battery intended for use on small satellites. (Credit: NASA/Dimitri Gerondidakis)
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from article Solid-state battery
Schematic illustration of an intercalation cathode reaction.
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from article Solid-state battery
Schematic diagram of solid-state battery.
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from article Animal
Zebras belong to the kingdom Animalia. These animals possess a distinctive black-and-white coloring pattern. (Credit: Richard Wear/Design Pics/Getty Images)
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from article Marsupialia
Skull and jaws of marsupials. (a) Didelphidae, Didelphis (the carnivorous opossum of North America), Recent, with polyprotodont incisors (I 5/4). (b) Phalangeridae, Trichosurus (the herbivorous opossum of Australia), Recent, with diprotodont…
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from article Marsupialia
Views of the soles of the left hindfoot of marsupials. (a) Didelphidae, Didelphis, representing the five-toed, polydactylous condition. (b) Phalangeridae, Trichosurus, representing the five-toed, syndactylous condition (digits II and III are bound…
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from article Acid and base
Ball-and-stick model of phosphoric acid (H3PO4). H = white. P = orange. O = red.
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from article Acid and base
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from article Hyperbolic navigation system
Typical grid of hyperbolic lines of position formed by a master (M) and two secondary stations (W and X).
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from article Hyperbolic navigation system
Individual lines of position from a master and two secondaries at location P. γ =LOP crossing angle.
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from article Hyperbolic navigation system
Typical curves of constant horizontal dilution of precision (HDOP) for a master (X) and two secondary stations (X and Y). Numbers give HDOP values of contours.
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from article Pholidota
Pangolin (genus Manis, order Pholidota). (Credit: Wildlife Alliance)
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from article Decomposition potential
Determination of decomposition potential.
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from article Vanadium
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from article Germanium
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from article Taste
Taste buds in a circumvallate papilla in a mouse tongue with taste cells visualized in color by cell-type-specific fluorescent antibodies. (Credit: Aki Taruno/Perelman School of Medicine, University of Pennsylvania)
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from article Taste
Illustration of the internal structures of a taste bud, which is composed of basal stem cells and three types of taste cells (dark, light, and intermediate). Taste cells extend from the base of the taste bud to the taste pore, where microvilli…
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from article Taste
Lemons and lemonade taste sour because they are very acidic and have a high concentration of hydrogen (H+) ions. (Credit: Mad Circles/Getty Images)
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from article Taste
Taste quality changes when spatial arrangements within a molecule are altered. (Copyright © McGraw-Hill Education)
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from article Salmon
Salmon swimming in the Russian River, Alaska. (Credit: Ryan Hagerty/U.S. Fish and Wildlife Service)
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from article Salmon
Chinook salmon (Oncorhynchus tshawytscha). (Credit: National Estuarine Research Reserve System, National Marine Fisheries Service, National Oceanic and Atmospheric Administration)
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from article Hexactinellida
The dried siliceous skeleton of a glass sponge, Euplectella. (Credit: Randolph Femmer/United States Geological Survey)
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from article Hexactinellida
The class Hexactinellida includes living and fossil forms. Living hexactinellids: (a) Hyalonema (Cyliconema) thomsoni (order Amphidiscosida) and (b) Regadrella phoenix (order Lyssacinosida). Fossil hexactinellid: (c) Hydnoceras tuberosum (order…
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from article Hexactinellida
A fossil hexactinellid sponge, Hydnoceras bathense (order Reticulosa). (Credit: James St. John)
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from article Lagomorpha
Pika (Ochotona princeps). (Copyright © California Academy of Sciences)
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from article Lespedeza
Sericea lespedeza (Lespedeza cuneata). (Photo by Chuck Bargeron, University of Georgia; Bugwood.org)
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from article Ice point
Arrangement for determining triple point.
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from article Ethylene
Structure of ethylene. (Black = carbon. White = hydrogen)
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from article Gadiformes
Beardie (Lotella physcis), a species of morid cod. (Photo copyright © John E. Randall)
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from article Milk
Dairy cow milking operation. (Credit: Yadamons/Getty Images)
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from article Milk
Milk and milk products yogurt and mozzarella. (Credit: Lilyana Vynogradova/iStockphoto/Getty Images)
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from article Multicomponent reactions
Multistep syntheses. (a) “Classical” versus (b) “one-pot”.
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from article Multicomponent reactions
Three-component Strecker α-amino nitrile synthesis and its use in α-amino acid synthesis.
