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Delayed luminescence of Prorocentrum minimum under controlled conditions

机译：受控条件下原中心最小值的延迟发光

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Delayed luminescence (DL), also termed delayed fluorescence or delayed light emission, is the phenomenon of long-lived light emission by plants and cyanobacteria after being illuminated with light and put into darkness. Culture growth of three Prorocentrum minimum strains was studied with DL measurements. DL decay kinetics was measured from 1-60 s after a pulse of white light. The strains used were from the Adriatic Sea (PmK), from Chesapeake Bay, USA (D5), and from the Baltic Sea (BAL), cultured at salinity of 32, 16, and 8 (practical salinity scale), respectively. The strains differed in cell size and chlorophyll a content (PmK > D5 > BAL), as well as in DL parameters. The DL results were compared to standard measurements of culture density and carbon content (calculated from biovolumes). DL decay curves had a specific peak, which changed with culture growth and showed more similarities between the strains PmK and D5. The DL intensity increased with cell density and carbon content in a two-stage process, corresponding to the lag and exponential phases of growth. DL intensity was best correlated with carbon content irrespective of strain and is proposed as an estimate of biomass and for differentiating between lag and exponential phases of growth.
机译：延迟发光（DL）也称为延迟荧光或延迟发光，是植物和蓝细菌在光照后置于黑暗中的长寿命发光现象。用DL测量研究了三种原中心最小菌株的培养生长。在白光脉冲后的1-60 s内测量DL衰减动力学。所用菌株分别来自亚得里亚海（PmK），美国切萨皮克湾（D5）和波罗的海（BAL），分别以32、16和8的盐度（实用盐度等级）进行培养。菌株的细胞大小和叶绿素a含量（PmK> D5> BAL）以及DL参数有所不同。将DL结果与培养物密度和碳含量（从生物量计算）的标准测量值进行比较。 DL衰减曲线有一个特定的峰，该峰随培养物的生长而变化，并且在菌株PmK和D5之间显示出更多相似性。 DL强度在两阶段过程中随细胞密度和碳含量的增加而增加，这与生长的滞后和指数阶段相对应。 DL强度与碳含量最相关，而与菌株无关，建议将其作为生物量的估计值并用于区分生长的滞后和指数期。

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