polytetrahedron
polytetrahedron In crystallography, a tetrahedron in which negative and positive forms are developed to different degrees in the same crystal, together with the possibility of raised secondary faces on each principal tetrahedron face. In mineralogy, the term may refer to the ability of SiO4 tetrahedra in silicate structures to polymerize, giving a variety of structures as a result of oxygen-sharing. These may result in chains (pyroxenes), double chains (amphiboles), sheets (micas), and three-dimensional framework silicates (quartz and feldspars).
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Secondary Structure , The secondary structure refers to the conformation present at a local region of a polypeptide . A few types of secondary structure are particularly s… Ernst Boris Chain , Chain, Ernst Boris (1906-1979)
Chain, Ernst Boris (1906-1979)
German–born English biochemist
Ernst Chain was instrumental in the creation of penicill… Chain , chain / chān/ • n. 1. a connected flexible series of metal links used for fastening or securing objects and pulling or supporting loads. ∎ (chains) s… Quaternary Structure , Many proteins are made up of a single, continuous polypeptide chain and are thus called monomeric. Other proteins are composed of two or more polypep… Tertiary Structure , The tertiary structure is the complete three-dimensional structure of a polypeptide chain. Many polypeptides fold into compact, globular structures i… Globular Protein , Globular Protein
In a globular protein, the amino acid chain twists and folds in a manner that enhances the protein's solubility in water by placing…
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polytetrahedron