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from article Superacid
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from article Superacid
Hammett acidity function (H0) values for some solutions in 100% H2SO4. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)
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from article Superacid
Hammett acidity function (H0) values for acids of the fluorosulfuric acid solvent system. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)
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from article Superacid
Hammett acidity function (H0) values for some HF−MF5 systems.
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from article Stress (psychology)
Dimensions of stressful experiences. (Credit: National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health)
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from article Stress (psychology)
Diagram of the hypothalamic-pituitary-adrenal axis. The thicker arrow indicates that the feedback of glucocorticoids on ACTH is most potent. Abbreviations: ACTH, adrenocorticotropic hormone; CRH, corticotropin-releasing hormone. (Copyright ©…
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from article Tooth
Stages in the development of a tooth.
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from article Tooth
Schema showing tooth replacement in lower vertebrates. (a, b) Horizontal lines represent the strand of tissue which connects the tooth germs in most vertebrates; vertical lines indicate the distance from the tooth germs to the surface of the jaw. In…
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from article Psittaciformes
Sulphur-crested cockatoo (Cacatua galerita). (Photo by Lloyd Glenn Ingles; copyright © California Academy of Sciences)
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from article Strigiformes
Northern spotted owl. (Photo by John and Karen Hollingsworth/U.S. Fish and Wildlife Service)
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from article Sloth
Pale-throated three-toed tree sloth (Bradypus tridactylus). (Credit: Lloyd Glenn Ingles; copyright © California Academy of Sciences)
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from article Colloid
Examples of colloid particles. (a) Zinc sulfide (sphalerite). (b) Cadmium carbonate, with an enlargement of the boxed section (courtesy of Egon Matijević).
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from article Prehistoric technology
Elements of stone flaking. (a) Relationship between the core and the flake. (b) Major feature of the ventral or release surface of the flake. (After I. Tattersall, E. Delson, and J. A. Van Couvering, eds., Encyclopedia of Human Evolution and…
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from article Prehistoric technology
Principal techniques of stone-tool manufacture. (a) Hard-hammer, with free-hand percussion. (b) Anvil technique. (c) Bipolar technique. (d) Soft-hammer percussion. (e) Indirect percussion or punch technique. (f) Pressure flaking. (After…
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from article Prehistoric technology
Potters from the village of Harappa, Pakistan, display their wares in front of a replica of a two-chambered kiln used by ancient potters in the Indus Valley civilization. (Photo courtesy of R. P. Wright)
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from article Chameleon
A short-horned chameleon (Calumma brevicorne, family Chamaeleonidae), which is a representative species found in Madagascar. (Credit: Gerald and Buff Corsi; copyright © California Academy of Sciences)
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from article Emulsion polymerization
Process of emulsion polymerization.
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from article Emulsion polymerization
Entry in emulsion polymerization.
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from article Emulsion polymerization
Spontaneous packing of low-polydispersity polystyrene particles about 200 nm in diameter.
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from article Emulsion polymerization
Monomers used in emulsion polymerization.
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from article Emulsion polymerization
Amphiphilic RAFT in emulsion polymerization.
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from article Bioterrorism
Civilians are the prime targets in bioterrorist attacks. During World War II, gas masks with filters were distributed to British civilians because of fears of a chemical agent attack. (Credit: Ingram Publishing/SuperStock)
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from article Bioterrorism
A color-enhanced scanning electron micrograph (SEM) showing splenic tissue from a monkey with inhalation anthrax. Rod-shaped bacilli of Bacillus anthracis (yellow) and an erythrocyte (red) are shown. (Credit: Arthur Friedlander/National Institute of…
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from article Stichosomida
Anterior end of Trichinella spiralis showing stichosome. (Adapted from B. G. Chitwood, 1930)
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from article Stichosomida
Portion of the stichosome of the whipworm, Trichuris trichiura. (Photomicrograph by Sung-Jong Hong, The Korean Society for Parasitology)
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from article Qualitative chemical analysis
A qualitative analysis test-tube method for separating cations into ion groups. (Copyright © McGraw-Hill Education/Stephen Frisch)
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from article Centrohelida
Centrohelida. (a) Raphidiophrys ambigua. (b) Acanthocystis erinaceoides.
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from article Hemiptera
Phylogenetic relationships among the extant Hemiptera groups.
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from article Hemiptera
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from article Hemiptera
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from article Hemiptera
Mouthparts and method of feeding of a plant bug.
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from article Hemiptera
Plant pests. (a) A colony of aphids on a rose shoot. (b) The citrus mealybug. (Ohio Agricultural Experiment Station)
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from article Hemiptera
An aphid (dorsal aspect).
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from article Hemiptera
Anterior dorsum of various Auchenorrhyncha: (a) cicada; (b) fulgoroid (apical part of antenna omitted); (c) another species of fulgoroid; (d) cercopid; (e) membracid, anterior view of face and pronotum.
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from article Hemiptera
Membracids on stems: (a) adult; (b) nymphs. (Courtesy of C. H. Hanson)
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from article Hemiptera
Peloridora kuscheli China (Peloridiidae).
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from article Hemiptera
Triatoma pallidipennis (Reduviidae). (Photo by E. S. Ross)
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from article Hemiptera
External anatomy of a typical bug.
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from article Hemiptera
Squash bug. (Photo by Scott Bauer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Hemiptera
Brown marmorated stink bug (Halyomorpha halys): adult (top) and fifth-instar nymph (bottom). (Photo by Stephen Ausmus, Agricultural Research Service, U.S. Department of Agriculture)
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from article Hemiptera
Oblique-dorsal view of a bedbug, Cimex lectularius. (Photo by Piotr Naskrecki, Public Health Image Library)
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from article Hemiptera
Nymph of the tarnished plant bug (Lygus lineolaris). (Photo by Scott Bauer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Genetic mapping
A genetic map shows the relative locations of genes in a linear arrangement. The map is based on the idea of linkage (that is, the closer that two genes are to each other on the chromosome, the greater is the probability that they will be inherited…
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from article Genetic mapping
The process of genetic mapping involves analyses of how traits and genetic markers segregate in experimental or natural populations to determine whether traits and markers (collectively, loci) are inherited together or independently from one…
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from article Genetic mapping
Genetic map of chromosome X showing some of the disorders that are possible. (Copyright © McGraw-Hill Education)
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from article Amphetamine
Molecular structures of amphetamine and methamphetamine (a chemical derivative of amphetamine). (Copyright © McGraw-Hill Education)
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from article Obolellida
Obolella. (a) Shell exterior (after J. Hall and J. M. Clarke, An introduction to the study of the Brachiopoda intended as a handbook for the use of students, Report of the N.Y. State Geologist for 1891, 1894). (b) Dorsal valve interior, and (c)…
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from article RNA World theory
Biochemical functions of the known natural ribozyme classes. Ribozymes are ribonucleic acid (RNA) molecules that can catalyze specific biochemical reactions. The self-cleaving ribozyme classes promote an internal phosphoester transfer reaction to…
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from article RNA World theory
Examples of possibly ancient riboswitches that bind RNA-derived compounds. Riboswitches for the essential cofactor thiamin (thiamine) pyrophosphate (TPP) are present in some species from all domains of modern life, whereas riboswitches for cyclic…
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from article Flame
Structure of a premixed laminar flame front.
