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      • Cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure and function in all living organisms, and that all cells come from pre-existing cells. Cells emerged on Earth at least 3.5 billion years ago.
      en.m.wikipedia.org/wiki/Cell_(biology)
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  2. en.wikipedia.org › wiki › BiologyBiology - Wikipedia

    3 days ago · Cell theory states that cells are the fundamental units of life, that all living things are composed of one or more cells, and that all cells arise from preexisting cells through cell division. Most cells are very small, with diameters ranging from 1 to 100 micrometers and are therefore only visible under a light or electron microscope.

  3. en.wikipedia.org › wiki › Solar_cellSolar cell - Wikipedia

    4 days ago · A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current , voltage , or resistance , vary when exposed to light.

  4. en.wikipedia.org › wiki › BacteriaBacteria - Wikipedia

    3 days ago · Bacteria can be classified on the basis of cell structure, cellular metabolism or on differences in cell components, such as DNA, fatty acids, pigments, antigens and quinones. While these schemes allowed the identification and classification of bacterial strains, it was unclear whether these differences represented variation between distinct ...

    • Bacteria
  5. en.wikipedia.org › wiki › Debye_ModelDebye model - Wikipedia

    4 days ago · The Debye model is a solid-state equivalent of Planck's law of black body radiation, where one treats electromagnetic radiation as a photon gas. The Debye model treats atomic vibrations as phonons in a box (the box being the solid). Most of the calculation steps are identical as both are examples of a massless Bose gas with linear dispersion ...

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  6. 5 days ago · In probability theory and information theory, the mutual information (MI) of two random variables is a measure of the mutual dependence between the two variables. More specifically, it quantifies the "amount of information" (in units such as shannons (), nats or hartleys) obtained about one random variable by observing the other random variable.

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