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  2. Beta barrel - Wikipedia

    en.wikipedia.org/wiki/Beta_barrel

    The arrows indicate the hydrogen bonds that were identified in the figures. The relative direction of each strand is indicated by the "+" and "-" at the bottom of the table. Except for strands 1 and 6, all strands are antiparallel. The parallel interaction between strands 1 and 6 accounts for the different appearance of the hydrogen bonding ...

  3. Protein secondary structure - Wikipedia

    en.wikipedia.org/wiki/Protein_secondary_structure

    The Dictionary of Protein Secondary Structure, in short DSSP, is commonly used to describe the protein secondary structure with single letter codes. The secondary structure is assigned based on hydrogen bonding patterns as those initially proposed by Pauling et al. in 1951 (before any protein structure had ever been experimentally determined).

  4. Multiverse - Wikipedia

    en.wikipedia.org/wiki/Multiverse

    This is an accepted version of this page This is the latest accepted revision, reviewed on 7 March 2025. Hypothetical group of multiple universes Not to be confused with Metaverse. "Multiverses" redirects here; not to be confused with MultiVersus. For other uses, see Multiverse (disambiguation). Part of a series on Physical cosmology Big Bang · Universe Age of the universe Chronology of the ...

  5. Pocket universe - Wikipedia

    en.wikipedia.org/wiki/Pocket_universe

    The mechanisms of inflation within these pocket universes could function in a variety of manners, such as slow-roll inflation, undergoing cycles of cosmological evolution, or resembling of the Galilean genesis or other 'emergent' universe scenarios. Lehners goes on to discuss which one of these types of universes we live in, and how that is ...

  6. Beta sheet - Wikipedia

    en.wikipedia.org/wiki/Beta_sheet

    There is also evidence that parallel β-sheet may be more stable since small amyloidogenic sequences appear to generally aggregate into β-sheet fibrils composed of primarily parallel β-sheet strands, where one would expect anti-parallel fibrils if anti-parallel were more stable. In parallel β-sheet structure, if two atoms C α i and C α

  7. Antiparallel (biochemistry) - Wikipedia

    en.wikipedia.org/wiki/Antiparallel_(biochemistry)

    Antiparallel and parallel beta sheet. Many proteins may adopt a beta sheet as part of their secondary structure. In beta sheets, sections of a single polypeptide may run side-by-side and antiparallel to each other, to allow for hydrogen bonding between their backbone chains. Beta sheets can also be either a parallel or anti-parallel secondary ...

  8. Complementarity (molecular biology) - Wikipedia

    en.wikipedia.org/wiki/Complementarity_(molecular...

    Each base pair, A = T vs. G ≡ C, takes up roughly the same space, thereby enabling a twisted DNA double helix formation without any spatial distortions. Hydrogen bonding between the nucleobases also stabilizes the DNA double helix. [3]

  9. Protein structure - Wikipedia

    en.wikipedia.org/wiki/Protein_structure

    This is the topic of the scientific field of structural biology, which employs techniques such as X-ray crystallography, NMR spectroscopy, cryo-electron microscopy (cryo-EM) and dual polarisation interferometry, to determine the structure of proteins. Protein structures range in size from tens to several thousand amino acids. [2]

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