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Some types of Josephson junctions. (a) Thin-film tunnel junction. (b) Point contact. (c) Thin-film weak link. (After E. Burstein and S. Lundqvist, eds., Tunneling Phenomena in Solids, Plenum, 1969)

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from article Josephson effect

DC current-voltage characteristics for a weak link and a tunnel junction. (After E. Burstein and S. Lundqvist, eds., Tunneling Phenomena in Solids, Plenum, 1969)

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from article DNA methylation

In humans and other mammals, DNA methylation involves the addition of a methyl group to a cytosine ring, forming methylcytosine. The methylation is carried out by a DNA methyltransferase (DNMT). (Copyright © McGraw-Hill Education)

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from article DNA methylation

Transcriptional silencing via DNA methylation. The methylated configuration blocks proteins that activate gene transcription, preventing them from acting as gene activators. (Copyright © McGraw-Hill Education)

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from article Microtechnique

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from article Microtechnique

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from article Microtechnique

Materials and method for applying cover slip to balsam wholemount. (a) Correct way; notice that the cover slip is held vertically centered over the drop of balsam. (b) Wrong way; this method draws the object to one side. (After P. Gray, Handbook of…

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from article Microtechnique

Making a smear preparation. (a) Place the drop about 1 in. (2.5 cm) from end of slide. (b) Apply a second slide just in front of the drop. (c) Push slide smoothly forward to spread the smear. (After P. Gray, Handbook of Basic Microtechnique, 3d ed.,…

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from article Microtechnique