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from article Barracuda
Great barracuda (Sphyraena barracuda). (Photo copyright © John E. Randall)
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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 Blowpipe
Glassblower blowing into a blowpipe to shape molten glass. (Credit: Hero Images/Getty Images)
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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 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 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 Human ecology
Shacks and garbage along a dirty river in a slum in Manila, Philippines. Human ecology encompasses how individual people and their communities interact with their particular environment. In many cases, though, humans have created polluted…
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from article Human ecology
Burning of a tropical rainforest in Brazil in order to clear land for animal grazing. (Credit: Barry Barker; copyright © McGraw Hill)
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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 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 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)
