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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 Vacuum fusion
Vacuum-fusion methods of analysis.
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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 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 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 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 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 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 Berkelium
