Automatic Monitoring of a Circadian Rhythm of Change in Light Transmittance in Ulva12
AUTOR(ES)
Britz, Steven J.
RESUMO
Ulva lactuca L. var. latissima (L.) DeCandolle has a circadian rhythm of visible light transmittance change which is caused by chloroplast orientation. With a continuously recording microphotometer system, clear rhythms could be monitored for up to 10 days. Measuring beam intensity effects on the free running period were seen down to 10−7 w cm−2. While these effects complicate the measuring process, they demonstrate that Ulva is very sensitive to light. The free running period in constant darkness at 20 C is 24 to 25 hours. The position in the cell occupied by the chloroplasts when the rhythm damps out can be influenced by light. A method is described by which the times of rhythm maxima can be calculated accurately and objectively from a relatively small number of points.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=542171Documentos Relacionados
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