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from article Bacteria
Illustration of a bacterium, with labeled structures. (Copyright © McGraw-Hill Education)
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Image
from article Bacteria
Scanning electron micrograph of two rod-shaped bacilli of Klebsiella pneumoniae (colorized red), which can cause pneumonia and bloodstream infections. (Credit: David Dorward/National Institute of Allergy and Infectious Diseases)
Image
from article Bacteria
Photomicrograph showing endospore staining of Bacillus megaterium using the Schaeffer–Fulton technique. Endospores, free spores, and vegetative cells are indicated. (Credit: Lisa Burgess; copyright © McGraw-Hill Education)
Image
from article Bacteria
Scanning electron micrograph of spheroid-shaped methicillin-resistant Staphylococcus aureus (MRSA) bacteria (colorized yellow) surrounded by cellular debris (colorized orange). (Credit: National Institute of Allergy and Infectious Diseases)
Image
from article Mast cells
Mast cells purified from mouse peritoneal cavity and stained with Giemsa exhibit cytoplasmic granules.
Image
from article Mast cells
Mast cell activation. (a) Multiple stimuli can activate mast cells. (b) Activated mast cells produce mediators and proteins that can influence the outcome of an immune response or its associated tissue changes.
Image
from article Galliformes
White-tailed ptarmigan (Lagopus leucurus), Glacier National Park, Montana. (Photo by Gerald and Buff Corsi, copyright © California Academy of Sciences)
Image
from article Echinoida
Tripneustes ventricosus (Lamarck), tropical eastern and western Atlantic, found at depths of 0–55 m (0–180 ft). (From G. Hendler et al., Sea Stars, Sea Urchins and Allies: Echinoderms of Florida and the Caribbean, Smithsonian Press, Washington, DC,…
Image
from article Echinoida
A pyramid from Aristotle's lantern, showing epiphyses joined and tooth with keel. (After H. L. Hawkins, The lantern and girdle of some Recent and fossil Echinoidea, Philos. Trans. R. Soc. Lond. Ser. B, 223:617–649, 1934)
Image
from article Echinoida
An ambulacral plate from the test, with the lowest element being the largest. (After T. Mortensen, A monograph of the Echinoidea: Camarodonta, C. A. Reitzel, Copenhagen, 1943)
