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from article Antiseptic
Antiseptics are often used in medical settings to clean wounds. In this case, an antiseptic is applied to a patient's arm wound after suture removal. (Copyright © McGraw-Hill Education)
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from article Antiseptic
An iodine swab is often externally applied to wounds in first-aid treatments. (Credit: Joe Belanger/Alamy)
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from article Oncogene
Viruses can carry oncogenes within their genome that are transferred into the cell by infection. For example, if a retrovirus integrates near a proto-oncogene (a normal-functioning precursor of an oncogene), the proto-oncogene can be packaged with…
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from article Oncogene
Two common mechanisms of oncogene activation in cancer cells. (a) DNA point mutation, that is, mutation of the DNA sequence that encodes a protein involved in growth signals. In this example, the GGC codon directs the amino acid glycine as the 12th…
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from article Guidance systems
Guidance system for (a) following a specified trajectory and (b) homing on a target.
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from article Connective tissue disease
Discoid lupus erythematosus is a notable connective tissue disease. Cutaneous manifestations are indicated by a positive lupus band test. In this image, a direct immunofluorescence examination of a discoid lupus erythematosus lesional skin biopsy…
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from article Connective tissue disease
The characteristic butterfly rash on the nose and cheeks of a female patient with systemic lupus erythematosus. (Copyright © McGraw-Hill Education)
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from article Connective tissue disease
Temporal arteritis is characterized by intense inflammation in the walls of arteries. This temporal artery has a wall that is thickened by an inflammatory infiltrate. The inflammatory infiltrate includes a giant cell formation (arrow). (Copyright ©…
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from article Connective tissue disease
Micrograph of a salivary gland in a patient with Sjögren's syndrome. Note the lymphocytic infiltrate in the left upper corner of the micrograph, which is associated with some disruption of the glandular parenchyma. (Copyright © McGraw-Hill Education)
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from article Mycorestoration
Wood-decay fungi (Trichaptum biforme) covering the cut end of a log. In this species, the growth is mostly in the outer region of the tree—that is, the sapwood.
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from article Mycorestoration
Mycorrhizal fungal hyphae forming a dense net around a root tip. The hyphae emanate into the soil to scavenge for mineral nutrients and water.
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from article Mycorestoration
Dense layer of hyphae covering the surface of forest soil. The millions of hyphae only 10 μm thick become so intertwined that they are visible to the naked eye.
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from article Mycorestoration
Cordyceps fruiting bodies projecting their brilliant colors and millions of spores from the leftover carcass of an underground insect. (Photo courtesy of Sean Westmoreland)
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from article Aflatoxin
Structures of major naturally occurring aflatoxins. (a) B1. (b) B2. (c) G1. (d) G2.
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from article Ipecac
Ipecac (Cephaelis ipecacuanha). (Photo courtesy of Steven Paton, Smithsonian Tropical Research Institute, Panama)
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from article Microwave landing system (MLS)
Landing operation with microwave landing system units located near the runway. The elevation element is sited such that the glide path crosses the threshold above 50 ft (15 m). (After R. J. Kelly and E. F. C. LaBerge, MLS: A total system approach,…
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from article Microwave landing system (MLS)
Azimuth antenna scanning beam and TRSB convention. Maximum, typical, and minimum values of the magnitude of the azimuth at the limits of the coverage volume are indicated. (After M. F. DiBenedetto, Development of Critical-Area Criteria for…
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from article Human immunodeficiency virus (HIV)
Scanning electron micrograph (SEM) of HIV particles (colorized yellow) infecting a human T cell. (Credit: National Institute of Allergy and Infectious Disease, National Institutes of Health)
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from article Ephedra
Ephedra funerea (Death Valley Mormon tea) is a species that grows in the southwestern United States. (Photo courtesy of J. Brew; Arches National Park, Utah)
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from article Fossil humans
Skeletal remains of Homo naledi (an offshoot of the hominin family) from a South African cave. The partial skeleton in the center consists of bones from several individuals. (Copyright © Lee Berger)
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from article Fossil humans
Human phylogeny over the last 35 million years, showing the skulls of the major known fossil relatives and possible ancestors of modern humans. (Copyright © McGraw-Hill Education)
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from article Fossil humans
Face (cast) of Ouranopithecus macedoniensis from Xirochori, Greece, about 9.7 million years old. (Credit: L. Meeker; copyright © E. Delson)
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from article Fossil humans
Cranium of Sahelanthropus tchadensis from deposits about 7–6 million years old in Chad: (left) original fossil; (right) virtual reconstruction. (Copyright © Mission Paléoanthropologique Franco-Tchadienne)
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from article Fossil humans
Ardipithecus ramidus from the 4.4-million-year-old site of Aramis, Middle Awash Valley, Ethiopia: (left) reconstructed female skull next to female chimpanzee skull in oblique and right lateral views; (right) partial female skeleton. (Credit: David…
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from article Fossil humans
Digital recreation of the skeleton of Lucy, who lived about 3.2 MYA. This female australopith (Australopithecus afarensis) was discovered at the Ethiopian site of Hadar in 1974. (Credit: miv123/iStock/Getty Images)
