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from article Isoprostanes
Mechanism for the formation of group VI isoprostanes. There are 16 products, but for clarity 8 of the enantiomers are not shown.
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from article Isoprostanes
LC/MS/MS of urinary isoprostanes. Selected peaks were identified by comparison with synthetic standards.
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from article Isoprostanes
GC/MS method measurement of iPF2α-VI. DCC = dicyclohexylcarbodiimide; EDCM = 1-ethyl-3(3-dimethylaminopropyl)carbodiimide methiodide; PFB = pentafluorobenzyl; TMS = trimethylsilyl; GC/MS = gas chromatography/mass spectrometry; H = hydrogen; D =…
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from article Poison sumac
Poison sumac (Toxicodendron vernix). (Photo by Keith Kanoti, Maine Forest Service)
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from article Clay minerals
Diagrammatic sketch showing (a) single silica tetrahedron and (b) sheet structure of silica tetrahedrons arranged in a hexagonal network. (After R. E. Grim, Clay Mineralogy, McGraw-Hill, 1953)
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from article Clay minerals
Diagrammatic sketch showing (a) single octahedral unit and (b) sheet structure of octahedral units. (After R. E. Grim, Clay Mineralogy, McGraw-Hill, 1953)
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from article Clay minerals
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from article Map projections
Oblique Mercator projection on a cylinder. (After American Oxford Atlas, Oxford, 1951)
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from article Map projections
Conical projection, based on origin 45°N, 10°E. (After American Oxford Atlas, Oxford, 1951)
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from article Map projections
Azimuthal projections with tangent planes have been raised above the sphere surface. (a) Polar azimuthal. (b) Oblique azimuthal. (After American Oxford Atlas, Oxford, 1951)
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from article Map projections
Four pseudocylindrical projections. (University of Wisconsin-Madison Cartographic Laboratory)
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from article Map projections
The property of equivalence is not maintained on the Mercator projection, making Greenland and South America appear similar in size. The inset map shows that South America is actually about 15 times larger than Greenland.
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from article Gametogenesis
Reproductive life cycle of many sexually reproducing animals, including humans.
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from article Gametogenesis
Stages in the development of the embryo sac and female cells involved in fertilization in angiosperms.
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from article Gametogenesis
Stages in the development of the pollen grain and sperm cells.
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from article Virus chemoprophylaxis
Pyrimidines uracil and thymine and their analogs.
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from article Explosive forming
Five methods of explosive forming. (a) Shaped charge and parabolic reflector. Shock and pressure are motive power. Reflector and charge must be shaped to direct explosive force toward workpiece. (b) Flat high explosive is simply placed on top of…
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from article Explosive forming
Typical metal shapes produced by explosive forming. Note weld in bowl. (National Northern Corp.)
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from article Plasticity
Plot of stress versus strain to fracture for a typical metal alloy that is deformed using a tensile load.
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from article Plasticity
Plot of stress versus strain to fracture for a typical plastic polymeric material that is deformed using a tensile load.
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from article Heterocorallia
Morphology of the heterocorallian skeleton. (a) External view. (b) Transverse thin section. (c) Median longitudinal thin section. (d) Enlarged part of c. (After R. C. Moore, ed., Treatise on Invertebrate Paleontology, pt. F, Geological Society of…
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from article Heterocorallia
Details of the heterocorallian body. (a) Generalized pattern of septal insertion (from O. Schindewolf, Grundfragen der Paläontologie, Schweizerbart, Stuttgart, 1950). (b) Reconstruction of the mesenterial in the soft body (from M. Gudo,…
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from article Joint (anatomy)
Sagittal section of the right knee joint of a human. The knee joint is the largest and most complex diarthrosis of the human body. (Copyright © McGraw-Hill Education)
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from article Joint (anatomy)
Cross section of the human knee showing its major components. This diarthrodial joint contains contacting surfaces on the tibia, femur, meniscus, and patella (kneecap). The patella protects the joint and also serves to redirect the force exerted by…
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from article Joint (anatomy)
Possible modes of lubrication in diarthrodial joints. (a–d) Different types of fluid-film lubrication showing the directions of loading, motion, and fluid flow: (a) hydrodynamic; (b) squeeze film; (c) hydrostatic weeping; and (d) boosted. (e) A…
