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An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections [1] for powering electrical devices. When a battery is supplying power, its positive terminal is the cathode and its negative terminal is the anode. [2]
Hebbian theory is a neuropsychological theory claiming that an increase in synaptic efficacy arises from a presynaptic cell's repeated and persistent stimulation of a postsynaptic cell. It is an attempt to explain synaptic plasticity , the adaptation of brain neurons during the learning process.
The cell surface antigens most commonly used to identify hES cells are the glycolipids stage specific embryonic antigen 3 and 4, and the keratan sulfate antigens Tra-1-60 and Tra-1-81. The molecular definition of a stem cell includes many more proteins and continues to be a topic of research. [29]
Incel (/ ˈ ɪ n s ɛ l / IN-sel; a portmanteau of "involuntary celibate" [1]) is a term associated with an online subculture of people (mostly white, [2] male, and heterosexual [3]) who define themselves as unable to find a romantic or sexual partner despite desiring one, and blame, objectify and denigrate women and girls as a result.
A homonculus inside a sperm cell, as drawn by Nicolaas Hartsoeker in 1695 Jan Swammerdam, Miraculum naturae sive uteri muliebris fabrica, 1729. In the history of biology, preformationism (or preformism) is a formerly popular theory that organisms develop from miniature versions of themselves.
Senescence (/ s ɪ ˈ n ɛ s ə n s /) or biological aging is the gradual deterioration of functional characteristics in living organisms. Whole organism senescence involves an increase in death rates or a decrease in fecundity with increasing age, at least in the later part of an organism's life cycle.
In 1838, the two scientists M. J. Schleiden and Theodore Schwann formulated a theory about cellular structure which stated, 'All the living organisms are made up of cells and the cell is the fundamental component of living organismus”. In 1885 Rudolf Virchow stated that all cells are formed from pre-existing cells.
A convection cell, also known as a Bénard cell, is a characteristic fluid flow pattern in many convection systems. A rising body of fluid typically loses heat because it encounters a colder surface. A rising body of fluid typically loses heat because it encounters a colder surface.