transformation

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transformation

 [trans″for-ma´shun]
change of form or structure; conversion from one form to another. In oncology, the change that a normal cell undergoes as it becomes malignant.
bacterial transformation the exchange of genetic material between strains of bacteria by the transfer of a fragment of naked DNA from a donor cell to a recipient cell, followed by recombination in the recipient chromosome.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

trans·for·ma·tion

(trans'fōr-mā'shŭn),
1. Synonym(s): metamorphosis
2. A change of one tissue into another, as cartilage into bone.
3. In metals, a change in phase and physical properties in the solid state caused by heat treatment.
4. In microbial genetics, transfer of genetic information between bacteria by means of "naked" intracellular DNA fragments derived from bacterial donor cells and incorporated into a competent recipient cell.
[L. trans-formo, pp. -atus, to transform]
Farlex Partner Medical Dictionary © Farlex 2012

transformation

(trăns′fər-mā′shən, -fôr-)
n.
Genetics
a. The change undergone by an animal cell upon infection by a cancer-causing virus.
b. The introduction of DNA from one cell into another by means of a bacteriophage or one of a variety of chemical or physical methods.

trans′for·ma′tion·al, trans·form′a·tive (-fôr′mə-tĭv) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

transformation

Oncology Malignant transformation The change that a normal cell undergoes as it becomes malignant, either due to infection with an oncogenic virus or environmental factors. See Malignant transformation, Progressive transformation of germinal centers, Linear transformation, Sol-gel transformation.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

trans·for·ma·tion

(trans'fŏr-mā'shŭn)
1. Synonym(s): metamorphosis.
2. A change of one tissue into another, such as cartilage into bone.
3. In metals, a change in phase and physical properties in the solid state caused by heat treatment.
4. microbial genetics Transfer of genetic information between bacteria by means of "naked" intracellular DNA fragments derived from bacterial donor cells and incorporated into a competent recipient cell.
[L. trans-formo, pp. -atus, to transform]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

transformation

  1. the acquisition of genetic material by the uptake of naked DNA by recipients. The DNA may become incorporated into the host genome by RECOMBINATION or may be extrachromosomal and exist as an autonomous REPLICON. Transformation occurs in various microorganisms. The process is important historically since, following transformation experiments by Frederick GRIffiTH, on the Streptococcus (Diplococcus) pneumoniae bacterium, DNA was shown to be the genetical material of cells by AVERY, MacLeod and McCarthy.
  2. changes occurring in cultured cells, generally after infection by certain tumour viruses, such as an ability to divide indefinitely.
  3. changes in form.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

trans·for·ma·tion

(transfŏr-māshŭn)
1. A change of one tissue into another, as in cartilage into bone.
2. In metals, change in phase and physical properties in solid state caused by heat treatment.
[L. trans-formo, pp. -atus, to transform]
Medical Dictionary for the Dental Professions © Farlex 2012