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transfection. transformation, in biology, one of several processes by which genetic material in the form of “naked” deoxyribonucleic acid (DNA) is transferred between microbial cells. Its discovery and elucidation constitutes one of the significant cornerstones of molecular genetics. The term also refers to the change in an animal cell ...
- Transfection
Transfection, technique used to insert foreign nucleic acid...
- Transfection
In 1809 he published Philosophie Zoologique, in which he described a two part mechanism by which change was gradually introduced into the species and passed down through generations. His theory is alternatively referred to as the theory of transformation or simply Lamarckism. Though today Lamarck's work is considered a major step forward, in ...
The first of these processes is known as transformation. It is an active process that involves a number of components, encoded by genes that can be on or off depending upon environmental conditions. Consider a type of bacteria that can import DNA from its environment. If, however, the density of bacteria is low, then there will be little DNA to ...
The Transmutation of species and transformism are 18th and early 19th-century ideas about the change of one species into another that preceded Charles Darwin 's theory of evolution through natural selection. [1] The French Transformisme was a term used by Jean Baptiste Lamarck in 1809 for his theory, and other 18th and 19th century proponents ...
Concept of Transformation Definition. Transformation is a stable genetic change brought about by the uptake of naked DNA, and the state of being able to take up exogenous DNA is called competence. They occur in two forms―natural and artificial. Natural Transformation. Only 1% of the bacterial species is capable of taking up DNA.
British bacteriologist Frederick Griffith reported the first demonstration of bacterial transformation —a process in which external DNA is taken up by a cell, thereby changing its morphology and physiology. Griffith conducted his experiments with Streptococcus pneumoniae, a bacterium that causes pneumonia.
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Transformation is one of three processes that lead to horizontal gene transfer, in which exogenous genetic material passes from one bacterium to another, the other two being conjugation (transfer of genetic material between two bacterial cells in direct contact) and transduction (injection of foreign DNA by a bacteriophage virus into the host ...
