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  2. Mezzotint - Wikipedia

    en.wikipedia.org/wiki/Mezzotint

    Mezzotint is known for the luxurious quality of its tones: first, because an evenly, finely roughened surface holds a lot of ink, allowing deep solid colours to be printed; secondly because the process of smoothing the plate with burin, burnisher and scraper allows fine gradations in tone to be developed. The scraper is a triangular ended tool ...

  3. Surface tone - Wikipedia

    en.wikipedia.org/wiki/Surface_tone

    Before the invention of tonal intaglio techniques such as mezzotint and aquatint surface tone was really the only way to add tonal effects, but the technique sometimes continued to be used with the new tonal techniques, especially in the etching revival than began around 1850, the "most visible characteristic of [which]... was an obsession with ...

  4. Aquatint - Wikipedia

    en.wikipedia.org/wiki/Aquatint

    1835 aquatint showing the first production of I puritani. Note range of tones. Aquatint is an intaglio printmaking technique, a variant of etching that produces areas of tone rather than lines. For this reason it has mostly been used in conjunction with etching, to give both lines and shaded tone. [1]

  5. À la poupée - Wikipedia

    en.wikipedia.org/wiki/À_la_poupée

    Elisha Kirkall, Heroic Stormy Landscape, mezzotint and etching printed à la poupée in two colours, after Jan van Huysum, 1724. The earliest known example of the technique is an impression of a religious engraving of about 1525 by Agostino Veneziano, where the Virgin and Child are printed in red, and the surrounding saints and background in blue.

  6. Outline of cell biology - Wikipedia

    en.wikipedia.org/wiki/Outline_of_cell_biology

    Light micrograph of a moss's leaf cells at 400X magnification. The following outline is provided as an overview of and topical guide to cell biology: . Cell biology – A branch of biology that includes study of cells regarding their physiological properties, structure, and function; the organelles they contain; interactions with their environment; and their life cycle, division, and death.

  7. Cell cortex - Wikipedia

    en.wikipedia.org/wiki/Cell_cortex

    In both cases, F-actin is enriched around the cell periphery. Scale bar: 10 micrometers. The cell cortex, also known as the actin cortex, cortical cytoskeleton or actomyosin cortex, is a specialized layer of cytoplasmic proteins on the inner face of the cell membrane. It functions as a modulator of membrane behavior and cell surface properties.

  8. Cell–cell recognition - Wikipedia

    en.wikipedia.org/wiki/Cellcell_recognition

    In cellular biology, cellcell recognition is a cell's ability to distinguish one type of neighboring cell from another. [1] This phenomenon occurs when complementary molecules on opposing cell surfaces meet.

  9. Growth medium - Wikipedia

    en.wikipedia.org/wiki/Growth_medium

    An agar plate – an example of a bacterial growth medium*: Specifically, it is a streak plate; the orange lines and dots are formed by bacterial colonies.. A growth medium or culture medium is a solid, liquid, or semi-solid designed to support the growth of a population of microorganisms or cells via the process of cell proliferation [1] or small plants like the moss Physcomitrella patens. [2]