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  2. Folded leaflet - Wikipedia

    en.wikipedia.org/wiki/Folded_leaflet

    Concertina fold. A concertina fold, also known as a zig-zag fold, accordion fold or z-fold, is a continuous parallel folding of brochures and similar printed material in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds. Because they do not nest (as in Letter Folds) panels can be the same size.

  3. SD card - Wikipedia

    en.wikipedia.org/wiki/SD_card

    August 1999. Secure Digital, officially abbreviated as SD, is a proprietary, non-volatile, flash memory card format the SD Association (SDA) developed for use in portable devices. The standard was introduced in August 1999 by SanDisk, Panasonic (Matsushita) and Toshiba as an improvement on MultiMediaCards (MMCs). [1]

  4. 3D fold evolution - Wikipedia

    en.wikipedia.org/wiki/3D_Fold_Evolution

    A fold is a common three-dimensional geological structure that is associated with strain deformation under stress. Fold evolution in three dimensions can be broadly divided into two stages, namely fold growth and fold linkage. The evolution depends on fold kinematics, [1] Fold mechanism, [2] [3] as well as a reporting of the history behind ...

  5. Protein folding - Wikipedia

    en.wikipedia.org/wiki/Protein_folding

    Protein folding. Protein folding is the physical process by which a protein, after synthesis by a ribosome as a linear chain of amino acids, changes from an unstable random coil into a more ordered three-dimensional structure. This structure permits the protein to become biologically functional.

  6. Cyclic symmetry in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Cyclic_symmetry_in_three...

    I h, (*532) [5,3] =. In three dimensional geometry, there are four infinite series of point groups in three dimensions ( n ≥1) with n -fold rotational or reflectional symmetry about one axis (by an angle of 360°/ n) that does not change the object. They are the finite symmetry groups on a cone. For n = ∞ they correspond to four frieze groups.

  7. USB flash drive - Wikipedia

    en.wikipedia.org/wiki/USB_flash_drive

    Three different Micro Center-branded digital media, showing a USB flash drive, an SD card, and a Micro-SD card, all having a capacity of 8 GiB, next to a U.S 5-cent coin for size comparison. Flash memory cards, e.g., Secure Digital cards, are available in various formats and capacities, and are used by many consumer devices. However, while ...