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.

nu·cle·oid

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

nucleoid

(no͞o′klē-oid′, nyo͞o′-)
n.
The undefined region of genetic material inside a prokaryotic cell, consisting of aggregated DNA.

nucleoid

A condensed body within a bacterium that contains the prokaryote’s genome.

nu·cle·oid

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

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.

nu·cle·oid

(nū'klē-oyd)
1. A nuclear inclusion body.
2. Synonym(s): nucleus (2) .
[nucleo- + G. eidos, resemblance]
References in periodicals archive ?
The nucleoid displaying fine DNA fibrils occupied the central zone of the cells.
(38, 39) Male and female gametes contained about ten mitochondria with rod-shaped mitochondrial nuclei (nucleoids).
Of the six genes identified, northern hybridization analysis demonstrated that four (callose synthase, HSP90, serine decarboxylase, and the biotin carboxylase subunit of acetyl-coenzyme A carboxylase) increased in expression, while the other two genes (the HAP5 subunit of the heme-activated protein (HAP) transcription factor and the chloroplast nucleoid DNA-binding protein CND41) decreased in expression.
Of particular, TFAM is a main regulator for the mtDNA copy number and plays a critical role in the stability of mtDNA via formation of nucleoid structure.
The A type 'immature' particles about 87nm in diameter consisted of a ring-shaped nucleoid surrounded by a membrane and a submembranous electron-dense layer or shell.
On the contrary, histone-like nucleoid structuring protein (H-NS) encoded by the hns gene, a global prokaryotic gene regulator, has been shown to repress the transcription of several virulence genes including toxT, ctx and tcpA (38).
The prokaryotic nucleoid, site of the bacterial DNA, as well as the gram-negative cell wall of the adhering spirochete, and the lack of kinetosome make the structure in Figures 4 and 5 easily distinguished from bona fide undulipodia.
usually have a single, circular chromosome located in the nucleoid region of the cell.
EBV shares the classic structural features of the other herpes viruses: it is enveloped, contains a nucleoid and capsid, and has a linear double-stranded DNA genome, which is contained within the nucleoid structure.
2:15 EFFECT OF SULFUR METABOLITES ON THE EXPRESSION OF THE PLASTID NUCLEOID PROTEIN FERREDOXIN:SULFITE REDUCTASE IN CULTURED SOYBEAN CELLS
SlmA is a DNA-associated division inhibitor that is directly involved in preventing Z ring assembly on portions of the membrane surrounding the nucleoid [28].