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from article Staining

Photomicrograph of Mycobacterium tuberculosis (the causative agent of tuberculosis) using the acid-fast Ziehl-Neelsen carbol fuchsin stain. In this case, the M. tuberculosis bacteria stain red (or reddish purple), whereas non-acid-fast species stain…

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from article Staining

Staining of Klebsiella bacteria using crystal violet. (Credit: Lisa Burgess/McGraw-Hill Education)

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from article Staining

Photomicrograph of a Gram-stained urethral exudate sample from a male who presented with a case of urethritis. Numerous extracellular Gram-negative Neisseria gonorrhoeae bacteria are evident. (Credit: Norman Jacobs/U.S. Centers for Disease Control…

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from article Vitamin A

Summary scheme depicting the dietary uptake, metabolism, and actions of vitamin A within the body. All vitamin A must be obtained from the diet as either preformed vitamin A (primarily as retinol and retinyl esters) or provitamin A carotenoid (such…

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from article Bone disorders

A colored x-ray of the hand of a patient with severe rheumatoid arthritis in all of the fingers. (Credit: Science Photo Library/Alamy Stock Photo)

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from article Bone disorders

A colored X-ray of a linear displacement fracture of an ulna (forearm bone) of a man. (Credit: Puwadol Jaturawutthichai/Shutterstock)

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from article Bone disorders

Comparison of a healthy normal bone (left) and a bone with osteoporosis (right). Osteoporosis leads to a decrease in bone mass and density, causing bones to become weak and brittle. (Credit: Stocktrek Images/Alamy Stock Photo)

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from article Salmon farming

Adult Atlantic salmon (Salmo salar). (Credit: William Hartley/U.S. Fish and Wildlife Service)

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from article Salmon farming

Atlantic salmon (Salmo salar) at a pre-smolt stage. (Credit: Edward Peter Steenstra/U.S. Fish and Wildlife Service)

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from article Salmon farming

A congregation of coho salmon (Oncorhynchus kisutch) released from a hatchery. Investigators continue to study the effects of farmed fish on neighboring populations of wild salmonids. (Credit: Salmon Ecology Team/Southwest Fisheries Science Center,…