Linked Life Data

6136299

Source:http://linkedlifedata.com/resource/pubmed/id/6136299

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1983-10-21
pubmed:abstractText
During growth on acetate, the pH of yeast cultures rises from 5.8 to around 7-8 in the stationary phase. This was found to result from acetic acid uptake and accompanying H+ loss. In addition, acetate-growing yeast were found to accumulate ammonia. The influence of pH on ammonia transport and accumulation was studied with the analogue [14C]methylamine with the following results. (a) Methylamine uptake kinetics from 0.1-50 mM were consistent with a single-component uptake system (NH+4 permease) at pH values more acidic than 6.5, and with a two-component system (NH+4 permease and NH3 diffusion) above pH 7.5. (b) Equilibrium accumulation of methylamine was found to increase with increasing pH. (c) Methylamine efflux from methylamine-loaded cells increased as the external pH decreased. It was concluded from measurements of the internal pH under various culture conditions that the accumulation of ammonia in acetate-growing alkaline cultures resulted from the sum of two processes: (1) an energy-driven NH+4 transport; and (2) NH3 diffusion dependent on the delta pH.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
7
pubmed:volume
733
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
234-41
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
Ammonia accumulation in acetate-growing yeast.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't