Reference Terms
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Peptide bond
A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H2O). This is a dehydration synthesis reaction (also known as a condensation reaction), and usually occurs between amino acids. The resulting CO-NH bond is called a peptide bond, and the resulting molecule is an amide. The four-atom functional group -C(=O)NH- is called an amide group or (in the context of proteins) a peptide group. Polypeptides and proteins are chains of amino acids held together by peptide bonds, as is the backbone of PNA.
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Matter & Energy News
August 21, 2025
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Aug. 3, 2025 — A team of engineers at RMIT University has developed a groundbreaking 3D-printed titanium alloy that s stronger, more ductile, and nearly 30% cheaper to produce than the traditional standard. By replacing expensive vanadium with more accessible ...
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Latest Headlines
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Aug. 19, 2025 — A team in Milan has developed a first-of-its-kind single-atom catalyst that acts like a molecular switch, enabling cleaner, more adaptable chemical ...
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Aug. 18, 2025 — For the first time, researchers have measured atomic temperatures in extreme matter and found gold surviving at 19,000 kelvins, more than 14 times its melting point. The result dismantles a ...
Aug. 18, 2025 — ETH Zurich scientists have levitated a tower of three nano glass spheres using optical tweezers, suppressing almost all classical motion to observe quantum zero-point fluctuations with unprecedented ...
Aug. 17, 2025 — Researchers have synthesized a stable cyclo[48]carbon, a unique 48-carbon ring that can be studied in solution at room temperature, a feat never achieved ...
Aug. 17, 2025 — Scientists have, for the first time, experimentally proven that angular momentum is conserved even when a single photon splits into two, pushing quantum physics to its most fundamental limits. Using ...
Aug. 16, 2025 — Scientists in Finland have measured the heaviest known nucleus to undergo proton emission, discovering the rare isotope 188-astatine. It exhibits a unique shape and may reveal a new kind of nuclear ...
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