6772634

Source:http://linkedlifedata.com/resource/pubmed/id/6772634

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0007634, umls-concept:C0038404, umls-concept:C0439148, umls-concept:C1512571
pubmed:issue	1
pubmed:dateCreated	1980-10-21
pubmed:abstractText	The mass doubling times of exponential-phase cultures of Streptococcus faecalis were varied from 30 to 110 min by omitting glutamine from a defined growth medium and providing different concentrations of glutamate (ranging from 300 to 14 mug/ml). After Formalin fixation, cells were dried by the critical point method, and carbon-platinum replicas were prepared. The surface area and volume of cell poles seen in these replicas were estimated by a computer-assisted, three-dimensional reconstruction technique. It was found that the amount of surface area and volume of poles seen in these replicas were independent of the growth rate of culture from which the samples were taken. These observations were consistent with the unit cell model hypothesis of Donachie and Begg, in which a small number of surface sites would produce a constant amount of new cell surface regardless of the mass doubling time of the culture. However, measurements of the thickness of the cell wall taken from thin sections of the same cells showed that the cell wall increased in thickness as a function of the increase in cellular peptidoglycan content which occurs when the growth rate of this organism is slowed down by a decrease in glutamate concentration. Thus, it would seem that although the size of polar shells made by S. faecalis is invariant with growth rate, the amount of wall precursors used to construct these shells is not.
pubmed:commentsCorrections	http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-13921527, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-4100835, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-4133352, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-4257049, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-4604949, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-4916411, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-4984078, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-5004998, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-821927, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-821928, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-863857, http://linkedlifedata.com/resource/pubmed/commentcorrection/6772634-96095
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/2985120R
pubmed:citationSubset	IM
pubmed:chemical	http://linkedlifedata.com/resource/pubmed/chemical/Peptidoglycan
pubmed:status	MEDLINE
pubmed:month	Jul
pubmed:issn	0021-9193
pubmed:author	pubmed-author:Daneo-MooreLL, pubmed-author:EdelsteinE MEM, pubmed-author:HigginsM LML, pubmed-author:RosenzweigM SMS
pubmed:issnType	Print
pubmed:volume	143
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	499-505
pubmed:dateRevised	2009-11-18
pubmed:meshHeading	pubmed-meshheading:6772634-Cell Division, pubmed-meshheading:6772634-Cell Wall, pubmed-meshheading:6772634-Enterococcus faecalis, pubmed-meshheading:6772634-Kinetics, pubmed-meshheading:6772634-Models, Biological, pubmed-meshheading:6772634-Peptidoglycan
pubmed:year	1980
pubmed:articleTitle	Unit cell hypothesis for Streptococcus faecalis.
pubmed:publicationType	Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.