| pubmed-article:5411760 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:5411760 | lifeskim:mentions | umls-concept:C0018155 | lld:lifeskim |
| pubmed-article:5411760 | lifeskim:mentions | umls-concept:C0007623 | lld:lifeskim |
| pubmed-article:5411760 | lifeskim:mentions | umls-concept:C1704675 | lld:lifeskim |
| pubmed-article:5411760 | pubmed:issue | 1 | lld:pubmed |
| pubmed-article:5411760 | pubmed:dateCreated | 1970-3-5 | lld:pubmed |
| pubmed-article:5411760 | pubmed:abstractText | Isolated cell walls of Staphylococcus aureus and Micrococcus lysodeikticus were found to expand and contract in response to changes in environmental pH and ionic strength. These volume changes, which could amount to as much as a doubling of wall dextran-impermeable volume, were related to changes in electrostatic interactions among fixed, ionized groups in wall polymers, including peptidoglycans. S. aureus walls were structurally more compact in the hydrated state and had a higher maximum charge density than M. lysodeikticus walls. However, they were less responsive to changes in electrostatic interactions, apparently because of less mechanical compliance. In media of nearly neutral pH, S. aureus walls had a net positive charge whereas M. lysodeikticus walls had a net negative charge. These charge differences were reflected in Donnan distributions of mobile ions between wall phases and bulk medium phases. Cell walls of unfractionated cocci also could be made to swell and contract, and wall tonus in intact cells appeared to be set partly by electrostatic interactions and partly by mechanical tension in the elastic structures due to cell turgor pressure. The experimental results led to the conclusions that bacterial cell walls have many of the properties of polyelectrolyte gels and that peptidoglycans are flexible polymers. A reasonable mechanical model for peptidoglycan structure might be a sort of three-dimensional rope ladder with relatively rigid, polysaccharide rungs and relatively flexible polypeptide ropes. Thus, the peptidoglycan network surrounding cocci appeared to be predominantly an elastic restraining structure rather than a rigid shell. | lld:pubmed |
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| pubmed-article:5411760 | pubmed:language | eng | lld:pubmed |
| pubmed-article:5411760 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:5411760 | pubmed:citationSubset | IM | lld:pubmed |
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| pubmed-article:5411760 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:5411760 | pubmed:month | Jan | lld:pubmed |
| pubmed-article:5411760 | pubmed:issn | 0021-9193 | lld:pubmed |
| pubmed-article:5411760 | pubmed:author | pubmed-author:MarquisR ERE | lld:pubmed |
| pubmed-article:5411760 | pubmed:author | pubmed-author:WuL LLL | lld:pubmed |
| pubmed-article:5411760 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:5411760 | pubmed:volume | 101 | lld:pubmed |
| pubmed-article:5411760 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:5411760 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:5411760 | pubmed:pagination | 92-101 | lld:pubmed |
| pubmed-article:5411760 | pubmed:dateRevised | 2009-11-18 | lld:pubmed |
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| pubmed-article:5411760 | pubmed:year | 1970 | lld:pubmed |
| pubmed-article:5411760 | pubmed:articleTitle | Electromechanical interactions in cell walls of gram-positive cocci. | lld:pubmed |
| pubmed-article:5411760 | pubmed:publicationType | Journal Article | lld:pubmed |
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