此項研究是用溶氧計連續偵測培養液中之溶氧量，藉以分析固氮\r
單胞藻RF-1 的光合韻律。實驗的結果清楚地看出RF-1 之光合韻律，\r
而且能夠清晰地觀察到其中光合作用、呼吸作用和固氮作用之間的相\r
互關係。研究中還發現：在不進行光合作用時，RF-1 的固氮作用也\r
會停止；另一方面，在有進行光合作用、但是停止固氮作用的狀況下，\r
RF-1 光合作用之韻律現象會喪失。這些實驗結果值得未來更深入地\r
探討。報告中也包括了單胞藻PCC6803 的光合韻律實驗，藉以做為\r
有固氮能力與沒有固氮能力藍綠藻之間的對照。The variation of dissolved oxygen (DO) in the culture of the\r
unicellular nitrogen-fixing cyanobacterium Synechococcus RF-1\r
under diurnal light/dark condition was detected automatically by DO\r
meter. The results indicated that the algae exhibited circadian\r
photosynthetic rhythm. The results also revealed that a respiration\r
rhythm occurred at dark phase when the culture was grown in\r
nitrogen-free medium. There was correlation between the rhythm of\r
photosynthesis and nitrogen fixation. The nitrogen-fixing activity\r
could not be detected if the photosynthesis was stop by cultivated\r
under continuous darkness. On the other hand, the rhythm of\r
photosynthesis could not persist when the nitrogen-fixing activity\r
was inhibited by NaNO3. In order to compare the difference\r
between Synechococcus RF-1 and the cyanobacterium, which\r
cannot fix nitrogen, the DO pattern of Synechocystis PCC6803 was\r
also investigated.
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