nucleoid

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nucleoid

 [noo´kle-oid]
1. resembling a nucleus.
2. a nucleus-like body sometimes seen in the center of an erythrocyte.
3. the central region of a bacterium, consisting of a dense irregularly shaped region containing DNA material without a surrounding nuclear membrane.
4. the genetic material (nucleic acid) of a virus, situated in the center of the virion.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

nu·cle·oid

(nū'klē-oyd),
1. Synonym(s): nucleiform
2. A nuclear inclusion body.
3. Synonym(s): nucleus (2)
[nucleo- + G. eidos, resemblance]
Farlex Partner Medical Dictionary © Farlex 2012

nucleoid

(no͞o′klē-oid′, nyo͞o′-)
n.
The undefined region of genetic material inside a prokaryotic cell, consisting of aggregated DNA.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

nucleoid

A condensed body within a bacterium that contains the prokaryote’s genome.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

nu·cle·oid

(nū'klē-oyd)
1. Synonym(s): nucleiform.
2. A nuclear inclusion body.
3. Synonym(s): nucleus (2) .
[nucleo- + G. eidos, resemblance]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

nucleoid

  1. the chromosomal region of a BACTERIUM. In ESCHERICHIA COLI it comprises mainly DNA with some PROTEINS (analagous to, but not HISTONES) and RNA. The structure is very compact and the DNA is folded into a series of loops, that are supercoiled (see SUPERCOILED DNA).
  2. the DNA mass in the CHLOROPLAST or MITOCHONDRION.
  3. the core of ribonucleic acid and protein in the virion of a RETROVIRUS.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

nu·cle·oid

(nū'klē-oyd)
1. A nuclear inclusion body.
2. Synonym(s): nucleus (2) .
[nucleo- + G. eidos, resemblance]
Medical Dictionary for the Dental Professions © Farlex 2012
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References in periodicals archive ?
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ISOLATION OF PHAGE P1 REGULATORY MUTANTS
The students can be prompted to identify the twine as representing the bacterial chromosome (the double helical structure should be very helpful) and the marbles as representing components of the cytoplasm, such as enzymes or ribosomes.
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All of the homologous genes of fragment R4' were found in eight bacterial chromosomes or plasmids, including the chromosomes of Pantoea vagans C9-1 (CP002206.1), Pantoea ananatis PA13 (CP003085.1), Pantoea ananatis LMG 5342 (HE617160.1), and Pantoea ananatis AJ13355 (AP012032.2) as well as plasmid unnamed1 from Pantoea agglomerans FDAARGOS_160 (CP014126.1), plasmid pEB102 from Erwinia billingiae Eb661 (FP236826.1), plasmid pEM65 from Erwinia amylovora (JQ292796.1), and plasmid EaACW_pEI70 from Erwinia amylovora CW56400 (CP002951.1) (Table 2 and Figure 3(a)).
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Gene transfer: Segments of bacterial chromosomes can be transferred to other bacteria by three naturally occurring mechanisms: plasmid conjugation, phage transduction, and transformation.
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Mosaic bacterial chromosomes: a challenge en route to a tree of genomes.
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Since bacterial chromosomes usually come in circles, this theory invokes pictures of stacked loops of DNA, resembling a roll of hard candies, and so has earned the name the Life Saver hypothesis.
Meet the Superbug
Since ParA and ParB bind to specific DNA sequences on a chromosome, t heir movement hints that they may be part of the machinery that guides a pair of bacterial chromosomes to opposite ends of the cell before it splits in two.
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