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from article Amino acid
Structural formula for an amino acid. (Copyright © McGraw Hill)
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from article Amino acid
The 20 amino acids that serve as the building blocks for proteins. These amino acids (shown with their respective three-letter abbreviations) can be divided into nonpolar, polar, and electrically charged groups. (Copyright © McGraw Hill)
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from article Amino acid
Synthesis of a dipeptide. When an amino group of one amino acid is linked to the carboxyl group of another amino acid, a peptide bond linkage is formed. A molecule of water (H2O) is split out when a peptide bond is formed. (Copyright © McGraw Hill)
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from article Amino acid
Two-dimensional chromatogram of a protein. (Credit: R. J. Block, E. L. Durrum, and G. Zweig)
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from article Mitochondrial replacement therapy
Spindle transfer involves the excision of the metaphase II spindle from a donor egg and replacing it with the metaphase II spindle from the affected egg. The metaphase II spindle contains the condensed chromosomes of the egg's haploid genome. Terms:…
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from article Mitochondrial replacement therapy
Cytoplasmic transplantation involves the addition of a donor's ooplasm (cytoplasm in an oocyte) to the recipient oocyte prior to fertilization. Terms: ICSI, intracytoplasmic sperm injection; mtDNA, mitochondrial DNA; nDNA, nuclear DNA. (Credit:…
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from article Mitochondrial replacement therapy
Pronuclear transfer requires that both the donor and affected eggs be fertilized by the father's sperm simultaneously in vitro. Following fertilization and once pronuclei are visible by microscopy, the two pronuclei from the donor egg are removed,…
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from article Star
A view of the night sky from Cerro Paranal in the Atacama Desert in Chile. The bright star at top left is Sirius, the brightest star other than the Sun as seen from Earth. The bright star at right is Canopus, which happens to be the second brightest…
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from article Star
Looking toward the core of Milky Way, along a line of sight holding millions of stars in the disk of the Galaxy and obscuring dark bands of dust. (Credit: NASA)
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from article Star
The Hertzsprung-Russell (HR) diagram, which plots stars' temperatures (x axis) against their luminosities (y axis). Numerous examples of stars in the Milky Way are included in this sample diagram. (Credit: ESO)
