1.
Phys Rev B Condens Matter
; 49(17): 11759-11766, 1994 May 01.
Artigo
em Inglês
| MEDLINE
| ID: mdl-10010042
2.
Phys Rev B Condens Matter
; 43(13): 10963-10969, 1991 May 01.
Artigo
em Inglês
| MEDLINE
| ID: mdl-9996828
3.
Radiat Environ Biophys
; 15(2): 203-12, 1978 Aug 10.
Artigo
em Inglês
| MEDLINE
| ID: mdl-724982
RESUMO
The H2(18O) enrichment, delta, in the water of leaves from four Brazilian trees, was studied. In all trees the leaf water showed a periodic variation in delta, with a maximum in the early afternoon and a minimum around 6 a.m. In general delta was found to be either higher or lower than the stationary enrichment which is supposed to depend only on the relative atmospheric humidity. This effect is due to the slow response of the system to variations of the humidity. For a special case, where steady-state conditions could be anticipated, the kinetic enrichment was obtained to 20 +/- 3%, which agrees with theoretical predictions.