Abstract:
:A series of microcalorimetric experiments were performed to investigate the effect of La(3+) on the formation of the competent state of Escherichia coli HB101 by using a LKB-2277 BioActivity Monitor at 37 C. The thermogenic curves in the absence and in the presence of La(3+) were obtained. Based on these curves, we calculated that the total heat effects (Q(T)) and the maximal power (P(max)) in the presence and absence of La(3+). Our experiments indicate that the total heat effects in the presence of a low concentration of La(3+) (= 100 microg/mL) are greater than those in the absence of La(3+). Their trends are similar with respect to the increasing concentration of La(3+). To the contrary, when the concentration of La(3+) is greater than 100 microg/mL, the total heat effects decrease with the increasing concentration of La(3+). Therefore, in the latter case, La(3+) has inhibitory effects on the formation of competence. Our experimental results suggest that the La(3+) ion in the environmental ecosystem can facilitate the formation of competence of E. coli HB101 and further stimulate the transfer of genetic materials between organisms.
journal_name
Biol Trace Elem Resjournal_title
Biological trace element researchauthors
Wenhua L,Yi L,Ruming Z,Zhixiong X,Ping S,Songsheng Qdoi
10.1385/bter:91:3:267subject
Has Abstractpub_date
2003-03-01 00:00:00pages
267-75issue
3eissn
0163-4984issn
1559-0720pii
BTER-91-3-267journal_volume
91pub_type
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