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from article Precipitation (chemistry)
Precipitation of calcium fluoride. (Copyright © McGraw-Hill Education/Stephen Frisch)
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from article Polystyrene
Polystyrene foam. (Credit: Raywoo/123RF)
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from article Symphyla
Scutigerella immaculata. This symphylan is a garden and greenhouse pest. (Photo by Ivo Antušek; BioLib.cz)
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from article Symphyla
Cercus (enlarged view). (Courtesy of Robert T. Allen, Academy of Natural Sciences, Philadelphia; Amanda Lawrence, Electron Microscope Center, Mississippi State University)
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from article Vacuum fusion
Vacuum-fusion methods of analysis.
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from article Cestida
Structure of Cestum veneris.
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from article Soil chemistry
Proper soil chemistry helps a green seedling to sprout out from the soil. Soil chemistry controls the availability of plant nutrients within the soil and thus influences plant growth. (Credit: amenic181/Shutterstock)
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from article Soil chemistry
Extensive chemical weathering can remove essential minerals and elements from soil. Typically, only the most insoluble compounds remain in the soil. For example, iron oxides may persist, imparting a reddish-brown color to the soil. (Credit: Stephen…
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from article Soil chemistry
Factors influencing the chemistry of a soil solution. (Credit: Based on an original illustration created by J. F. Hodson)
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from article Supercritical-fluid chromatography
Block diagram of supercritical-fluid chromatograph. With some detectors (for example, flame ionization), the pressure/flow restrictor is mounted in the detector.
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from article Supercritical-fluid chromatography
High-resolution separation of the oligomers of a methyl silicone by pressure-programmed supercritical-fluid chromatography; each peak in the chromatogram is due to an oligomer with one more Si(CH3)2O group than the previous peak. Pressure is held at…
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from article Thrombosis
Thrombin molecular model. (Credit: Molekuul/Science Photo Library/Getty Images)
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from article Thrombosis
Organized thrombus in an artery with recanalization.
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from article Thrombosis
Organized thrombus in an artery with scar formation; the artery is completely occluded by the fibrotic mass.
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from article Cephalochordata
European lancelet (Branchiostoma lanceolatum). (After J. E. Webb, On the populations of Branchiostoma lanceolatum and their relations with the West African lancelets, Proc. Zool. Soc. Lond., 127:131, 1956)
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from article Decision theory
Decision tree for the problem given in the text. Numbers at nodes represent time past alarm (7:00 A.M.), and numbers at branches refer to the decision mode or state of nature.
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from article Decision theory
From of a decision matrix. Oij = outcome corresponding to the interaction of a strategy (Si) and a state of nature (Nj).
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from article Decision theory
Decision tree structure to determine the subjective utility of lottery outcomes.
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from article Decision theory
Hypothetical subjective utility curves.
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from article Rhinoceros
Black rhinoceros (Diceros bicornis). (Credit: Lloyd Glenn Ingles; copyright © California Academy of Sciences)
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from article Ferret
An endangered black-footed ferret (Mustela nigripes). (Photo copyright © Joseph Dougherty)
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from article Siphonostomatoida
Siphonostomatoida. (a) Representative siphonostomatoid mandible; (b) brachiform maxilla (after Z. Kabata, Parasitic Copepoda of British Fishes, vol. 152, Ray Society, London, 1979). (c) Representative female caligid; (d) female Pennella (after P. A.…
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from article Holothuroidea
Cucumaria, a representative holothurian.
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from article Holothuroidea
Holothurian anatomy.
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from article Calcium
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from article Calcium
Calcium carbonate towers, called tufa, in the saline waters of Mono Lake, California, United States. (Credit: Steve Heap/Shutterstock)
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from article Food preservation
Packaging operation in a biscuit factory. (©Erik Isakson/Blend Images)
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from article Sexually transmitted diseases
Acquired immune deficiency syndrome (AIDS) is a sexually transmitted disease caused by the human immunodeficiency virus (HIV). In this image, a human T cell (blue) is under attack by HIV (yellow), hampering the effectiveness of the body's immune…
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from article Sexually transmitted diseases
Prevalence of Chlamydia trachomatis (the most-common sexually transmitted bacterial pathogen) among individuals aged 14 to 39. The prevalence varies by sex, race/ethnicity, and age. Error bars indicate 95% confidence intervals. (Credit: U.S. Centers…
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from article Sexually transmitted diseases
Age-related incidence of hospitalized cases of acute pelvic inflammatory disease (salpingitis) in sexually experienced females in the United States. (Copyright © McGraw-Hill Education)
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from article Calanoida
Diaptomus. (a) Lateral view of male. (b) Dorsal view of female.
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from article Ophiuroidea
Representative ophiuroids, which have a quite distinctive shape. (a) Ophiopeza cylindrica (alternatively, Pectinura cylindrica). (b) Asteroporpa australiensis (alternatively, Astroporpa wilsoni). (c) Gorgonocephalus chilensis.
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from article Ophiuroidea
External features of the ophiuroid Amphiura. (a) Aboral view. (b) Adoral view.
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from article Californium
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from article Tetanus
Photomicrograph showing endospores forming at the ends of Clostridium tetani bacterial cells, which are shaped like small tennis rackets. Clostridium tetani is the causative agent of tetanus. (Credit: Lisa Burgess; copyright © McGraw Hill)
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from article Syphilis
Syphilis is caused by Treponema pallidum, which is a corkscrew-shaped motile bacterium (spirochete). (Credit: National Institute of Allergy and Infectious Diseases, National Institutes of Health)
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from article Koji mold (Aspergillus oryzae)
Koji molds and related fungi. Left to right: Aspergillus oryzae, A. sojae, and A. flavus. Top: Colonies grown on agar plates. Bottom: Microscopic images of conidia (spores). (Credit: T. Okuda/Tamagawa University Research Institute, Japan)
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from article Koji mold (Aspergillus oryzae)
Food manufacturing processes: (a) sake production; (b) miso production; (c) shoyu production. (Copyright © McGraw Hill)
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from article Koji mold (Aspergillus oryzae)
Koji production as one of the processes of sake production in the Edo Era, Japan. Steamed rice is spread on straw mats for cooling (right) and then mixed with Tane-koji (next place to the left). The room at the back is the koji-muro. (Credit: Nihon…
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from article Quantum chemistry
Methylenecyclopropane structure.
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from article Quantum chemistry
Comparison of self-consistent-field transition states for the HONC → HOCN reaction using four different basis sets.
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from article Quantum chemistry
Example of a sizable molecule for which complete DFT geometrical optimization with a substantial basis set became routine in 1998.
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from article Malacostraca
Caridoid facies. (After E. R. Lankester, ed., A Treatise on Zoology, pt. 7, fasc. 3, A. and C. Black, 1909)
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from article Malacostraca
Representative malacostracan thoracic appendages: (a) biramous ambulatory thoracic appendage of an Anaspidacea; (b) uniramous thoracic walking leg of a Stenopodidea; (c) first maxilliped of a Paguroidea; (d) third maxilliped of a Thalassinoidea; (e)…
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from article Pauropoda
A typical pauropod (genus Allopauropus) with bifurcate antennae, 9 pairs of legs, and a well-developed anal pygidium. The anterior part of the animal is located toward the top right-hand corner of the image. (Photo by Andy Murray)
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from article Rabies
Negri bodies (cytoplasmic inclusion bodies) in infected nerve cells in a dog brain are characteristic cellular changes that occur as a result of rabies encephalitis. (Credit: G. Heid/Centers for Disease Control and Prevention)
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from article Rabies
Schematic model of a rabies virus showing the surface glycoprotein spikes (projections) extending from the lipid envelope that surrounds the internal nucleocapsid and the matrix protein lining the envelope. The nucleocapsid comprises the single RNA…
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from article Monogenea
Two Monopisthocotylea (a, b) and two Polyopisthocotylea (c, d). From left to right: Pseudohaliotrema carbunculus, Heterocotyle aetobatis, Heteronchocotyle leucas, and Heteraxinoides xanthophilis.
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from article Monogenea
Life cycles of Monogenea. From left to right: (a) Gyrodactylus funduli (note embryos within embryos), (b) Polystoma integerrimum (note two types of adults either on the gills and skin of tadpoles or in the bladder), and (c) Diplozoon species (note…
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from article Berkelium
