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  2. Homeostasis - Wikipedia

    en.wikipedia.org/wiki/Homeostasis

    In biology, homeostasis (British also homoeostasis; / h ɒ m i oʊ ˈ s t eɪ s ɪ s,-m i ə-/ hoh-mee-oh-STAY-sis) is the state of steady internal physical and chemical conditions maintained by living systems. [1]

  3. Chemical bond - Wikipedia

    en.wikipedia.org/wiki/Chemical_bond

    A chemical bond is the association of atoms or ions to form molecules, crystals, and other structures. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds , or some combination of these effects.

  4. Balance of nature - Wikipedia

    en.wikipedia.org/wiki/Balance_of_nature

    The balance of nature, also known as ecological balance, is a theory that proposes that ecological systems are usually in a stable equilibrium or homeostasis, which is to say that a small change (the size of a particular population, for example) will be corrected by some negative feedback that will bring the parameter back to its original "point of balance" with the rest of the system.

  5. Chemical equation - Wikipedia

    en.wikipedia.org/wiki/Chemical_equation

    A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction. [1]

  6. Detailed balance - Wikipedia

    en.wikipedia.org/wiki/Detailed_balance

    A Markov process is called a reversible Markov process or reversible Markov chain if there exists a positive stationary distribution π that satisfies the detailed balance equations [13] =, where P ij is the Markov transition probability from state i to state j, i.e. P ij = P(X t = j | X t − 1 = i), and π i and π j are the equilibrium probabilities of being in states i and j, respectively ...

  7. Potassium in biology - Wikipedia

    en.wikipedia.org/wiki/Potassium_in_biology

    Potassium is the major cation (K +, a positive ion) inside animal cells, while sodium (Na +) is the major cation outside animal cells.The difference between the concentrations of these charged particles causes a difference in electric potential between the inside and outside of cells, known as the membrane potential.

  8. Molecular Biology of the Cell (book) - Wikipedia

    en.wikipedia.org/wiki/Molecular_Biology_of_the...

    Molecular Biology of the Cell has been described as "the most influential cell biology textbook of its time". [2] The sixth edition is dedicated to the memory of co-author Julian Lewis, who died in early 2014. The book was the first to position cell biology as a central discipline for biology and medicine, and immediately became a landmark ...

  9. Cell theory - Wikipedia

    en.wikipedia.org/wiki/Cell_theory

    In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.