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from article Insect physiology
Brood X cicada drying out after shedding its exoskeleton. (Credit: Michael J. Shirey)
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from article Insect physiology
Wing movements in the flight of an insect. (Copyright © McGraw Hill)
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from article Insect physiology
Compound eye structure. (a) Head with compound eye. (b) Four ommatidia removed and magnified. (c, d) Representative types of ommatidia. (Copyright © McGraw Hill)
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from article Severe acute respiratory syndrome (SARS)
Electron microscopic image of a thin section of a severe acute respiratory syndrome coronavirus (SARS-CoV) within the cytoplasm of an infected cell, showing the spherical particles and cross sections through the viral nucleocapsid. (Credit: C. S.…
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from article Botulism
A colony of Clostridium botulinum, the causative agent of botulism, growing on egg yolk agar. (Credit: Larry Stauffer/Centers for Disease Control and Prevention)
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from article Ribonucleic acid (RNA)
Structure of ribonucleic acid (RNA). Each nucleotide is composed of three parts: a five-carbon sugar known as ribose; a phosphate group (P); and one of four bases attached to each ribose. The four bases are adenine (A), cytosine (C), guanine (G),…
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from article Ribonucleic acid (RNA)
Structural representations of a generalized tRNA molecule. (a) Secondary structure model showing base-pairing interactions within the tRNA. The characteristic and/or invariant nucleotides are the same regardless of the type of tRNA; the remainder…
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from article Liver
The human liver is located in the right upper quadrant of the abdomen, immediately beneath the diaphragm. Two hepatic lobes are recognized: a larger right lobe and a smaller left lobe. The hepatic artery and portal vein provide the liver with a dual…
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from article Liver
Diagram of the histology of the liver. (Copyright © McGraw-Hill Education)
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from article Liver
Human liver and its major dorsal connections. Rami venae portae: C, centralis; I, intermedius; ID, inferior dexter; Inf, inferior sinister; L, lateralis; Q, quadratus; SS, superior sinister. Venae hepaticae: HCD, dorsocaudalis; HD, dextra; HM,…
