Paper · 4938543

Studies on Escherichia coli sex factors. 3. Covalently closed F'Lac DNA molecules.

Freifelder D. J Mol Biol, 1968. Cited by 47 papers, by iCite.

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ConductScience Library. Studies on Escherichia coli sex factors. 3. Covalently closed F'Lac DNA molecules. Papers, record 4938543. Release papers-2026-11-12-0.1.0, 12 Nov 2026. https://conductscience.org/library/papers/4938543

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Paper

PubMed's record of the paper, with iCite's citation figures. No abstract is shown.

Title: Studies on Escherichia coli sex factors. 3. Covalently closed F'Lac DNA molecules.; PubMed
Journal: J Mol Biol; PubMed
Year: 1968; PubMed
Publication types: Journal Article; PubMed
PubMed: https://pubmed.ncbi.nlm.nih.gov/4938543/; PubMed
DOI: https://doi.org/10.1016/0022-2836(68)90232-5; PubMed
The journal: https://conductscience.org/library/journal-index/2985088R; PubMed
Citations, by iCite: 47; iCite
Revised in PubMed: 2019-07-10; PubMed

Authors1

The authors in the order PubMed's record lists them, with the ORCID iDs it states.

Order	Author	Forename	Kind	ORCID iD
1	Freifelder D	D

Source PubMed

Topics11

NLM's MeSH indexing of the paper, its major topics first.

MeSH term	Major
DNA, Bacterial	Major topic
Escherichia coli	Major topic
Centrifugation, Density Gradient
Macromolecular Substances
Methods
Molecular Weight
Radiation Effects
Sex Factors
Sodium Hydroxide
Thymine
Tritium

Source PubMed

Grants0

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None in this release.

Trials0

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None in this release.

Comments and corrections0

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References0

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Cited by19

The papers in our copy of PubMed whose reference list names this one, newest first. iCite, which reads more sources, counts 47 citations.

PMID	Title	Journal	Year	In Papers	Source
35,373,578	A Brief History of Plasmids.	EcoSal Plus	2022	https://conductscience.org/library/papers/35373578	PubMed
16,559,102	Vegetative Replication and Transfer Replication of Deoxyribonucleic Acid in Temperature-Sensitive Mutants of Escherichia coli K-12.	J Bacteriol	1970	https://conductscience.org/library/papers/16559102	PubMed
5,021,310	Granulosis virus deoxyribonucleic acid: a closed, double-stranded molecule.	J Virol	1972	https://conductscience.org/library/papers/5021310	PubMed
4,944,013	Isolation and characterisation of Hfr strains from a recombination-deficient strain of Escherichia coli.	Mol Gen Genet	1971	https://conductscience.org/library/papers/4944013	PubMed
4,943,172	Non-chromosomal antibiotic resistance in bacteria. 3. Isolation of the discrete transfer unit of the R-factor R1.	Proc Natl Acad Sci U S A	1970	https://conductscience.org/library/papers/4943172	PubMed
4,926,680	Studies on Escherichia coli sex factors: evidence that covalent circles exist within cells and the general problem of isolation of covalent circles.	J Bacteriol	1971	https://conductscience.org/library/papers/4926680	PubMed
4,919,748	Specific labeling and physical characterization of R-factor deoxyribonucleic acid in Escherichia coli.	J Bacteriol	1970	https://conductscience.org/library/papers/4919748	PubMed
4,919,135	Transfer-defective mutants of sex factors in Escherichia coli. II. Deletion mutants of an F-prime and deletion mapping of cistrons involved in genetic transfer.	Genetics	1970	https://conductscience.org/library/papers/4919135	PubMed
4,905,668	Topological relationship of prophage lambda to the bacterial chromosome in lysogenic cells.	Proc Natl Acad Sci U S A	1970	https://conductscience.org/library/papers/4905668	PubMed
4,904,513	Loss of an episomal fertility factor following the multiplication of coliphage M13.	Mol Gen Genet	1969	https://conductscience.org/library/papers/4904513	PubMed

1 to 10 of 19

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Genes0

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None in this release.

Drugs0

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None in this release.

Data0

The data bank entries PubMed's record names. Trial numbers are under Trials.

None in this release.

Data dates

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PubMed: 2026-11-06; PubMed
iCite: 2026-11-05; iCite
PMC's ID file: 2026-11-05; PMC's ID file
NIH RePORTER's grant and paper links: 2026-11-01; NIH RePORTER's grant and paper links
Trials: 2026-11-12
Gene search: 2026-11-11
Pipelines: 2026-09-18

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ChEMBL, through Open TargetsCC BY-SA 3.0
ClinicalTrials.govNo license stated
HGNCCC0
iCiteCC BY 4.0
NCBI GenePublic domain (US government)
NIH RePORTER's grant and paper linksPublic domain
Open TargetsCC0 1.0
PMC's ID filePublic domain (US government)
PubMedNLM's terms
PubTator 3Public domain
UniProtCC BY 4.0

Each source's terms

ChEMBL, through Open TargetsCC BY-SA 3.0, for the parts from ChEMBL. Read on 8 Nov 2026 at https://platform-docs.opentargets.org/licence
ClinicalTrials.govnone stated
HGNCCC0: https://www.genenames.org/about/license/
iCiteCC BY 4.0
NCBI GeneNone named for the file. NCBI says information created by or for the US government on its site is in the public domain, and asks that NLM be acknowledged: https://www.ncbi.nlm.nih.gov/home/about/policies/
NIH RePORTER's grant and paper linksPublic domain (NIH RePORTER)
Open TargetsCC0 1.0. Open Targets asks that users cite its latest paper: Buniello et al. 2025, Open Targets Platform: facilitating therapeutic hypotheses building in drug discovery, Nucleic Acids Research 53(D1):D1467, PMID 39657122. Read on 8 Nov 2026 at https://platform-docs.opentargets.org/licence
PMC's ID fileNone named for the file. NCBI says information created by or for the US government on its site is in the public domain, and asks that NLM be acknowledged: https://www.ncbi.nlm.nih.gov/home/about/policies/
PubMedNLM's terms
PubTator 3Public domain
UniProtCC BY 4.0. UniProt's licence file: "All databases and documents in the UniProt FTP directory may be copied and redistributed freely, without advance permission, provided that this copyright statement is reproduced with each copy." UniProt asks that users cite its latest paper: The UniProt Consortium, UniProt: the Universal Protein Knowledgebase in 2025, Nucleic Acids Research 53:D609-D617, https://doi.org/10.1093/nar/gkae1010. Read on 9 Nov 2026 at https://www.uniprot.org/help/license

ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.

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