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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. Cells are the basic unit of structure in all living organisms and also the basic unit ...
686465. Anatomical terminology. [ edit on Wikidata] The cell is the basic structural and functional unit of all forms of life. Every cell consists of cytoplasm enclosed within a membrane; many cells contain organelles, each with a specific function. The term comes from the Latin word cellula meaning 'small room'.
Incel. Incel ( / ˈɪnsɛl / 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. [ 4][ 5][ 6] Originally coined as " invcel " around 1997 by a ...
Pangenesis. Charles Darwin 's pangenesis theory postulated that every part of the body emits tiny particles called gemmules which migrate to the gonads and are transferred to offspring. Gemmules were thought to develop into their associated body parts as offspring matures. The theory implied that changes to the body during an organism's life ...
Cell culture is also a key technique for cellular agriculture, which aims to provide both new products and new ways of producing existing agricultural products like milk, (cultured) meat, fragrances, and rhino horn from cells and microorganisms. It is therefore considered one means of achieving animal-free agriculture.
Fuel cell. Demonstration model of a direct methanol fuel cell (black layered cube) in its enclosure. Scheme of a proton-conducting fuel cell. A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) [ 1] into electricity through a pair of redox reactions. [ 2]
A scientific theory is an explanation of an aspect of the natural world and universe that can be (or a fortiori, that has been) repeatedly tested and corroborated in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled ...
Theodor Schwann ( German pronunciation: [ˈteːodoːɐ̯ ˈʃvan]; [ 1][ 2] 7 December 1810 – 11 January 1882) was a German physician and physiologist. [ 3] His most significant contribution to biology is considered to be the extension of cell theory to animals. Other contributions include the discovery of Schwann cells in the peripheral ...