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首页> 外文期刊>Biomolecular engineering >Efficient use of strong light for high photosynthetic productivity: interrelationships between the optical path, the optimal population density and cell-growth inhibition
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Efficient use of strong light for high photosynthetic productivity: interrelationships between the optical path, the optimal population density and cell-growth inhibition

机译：有效利用强光实现高光合作用：光路，最佳种群密度和细胞生长抑制之间的相互关系

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The interrelationships between the optical path in flat plate reactors and photosynthetic productivity were elucidated. In preliminary works, a great surge in photosynthetic productivity was attained in flat plate photoreactors with an ultra short (e.g. 1.0 cm) optical path, in which extremely high culture density was facilitated by vigorous stirring and strong light. This surge in net photosynthetic efficiency was associated with a very significant increase in the optimal population density facilitated by the very short optical path (OP). A salient feature of these findings concerns the necessity to address growth inhibition (GI) which becomes increasingly manifested as cell concentration rises above a certain, species-specific, threshold (e.g. 1-2 billion cells of Nannochloropsis sp. ml~(-1)). Indeed, ultrahigh cell density cultures may be established and sustained only if growth inhibition is continuously, or at least frequently, removed. Nannochloropsis culture from which GI was not removed, yielded 60 mg~(-1) h~(-1), yielding 260 mg l~(-1) h~(-1) when GI was removed. Two basic factors crucial for obtaining maximal photosynthetic productivity and efficiency in strong photon irradiance are defined: (1) areal cell density must be optimal, as high as possible (cell growth inhibition having been eliminated), insuring the average photon irradiance (I_(av)) available per cell is falling at the end of the linear phase of the PI_(av) curve, relating rate of photosynthesis of I_(av), i.e. ～photon irradiance per cell. (2) The light-dark (L-D) cycle period, which is determined by travel time of cells between the dark and the light volumes along the optical path, should be made as short as practically feasible, so as to approach, as much as possible the photosynthetic unit turnover time. This is obtainable in flat plate reactors by reducing the OP to as small a magnitude as is practically feasible.
机译：平板反应器中的光路和光合作用之间的相互关系被阐明。在前期工作中，在具有超短（例如1.0cm）光路的平板光反应器中，光合作用的生产率大大提高，其中通过剧烈搅拌和强光促进了极高的培养密度。净光合作用效率的激增与非常短的光路（OP）促进的最佳种群密度的显着增加有关。这些发现的一个显着特征涉及解决生长抑制（GI）的必要性，当细胞浓度超过特定的物种特异性阈值时（例如，Nannochloropsis sp。ml〜（-1）的12亿个细胞），这种抑制越来越明显）。确实，只有连续或至少经常去除生长抑制时，才能建立并维持超高细胞密度培养。不去除GI的拟南芥培养物产生60mg〜（-1）h〜（-1），去除GI时产生260mg l〜（-1）h〜（-1）。定义了两个基本因素，这些基本因素对于在强光子辐照下获得最大的光合作用生产率和效率至关重要：（1）面细胞密度必须尽可能最佳（尽可能高（已消除细胞生长抑制）），以确保平均光子辐照度（I_（av ））每个细胞的可用量正下降到PI_（av）曲线的线性阶段的末尾，与I_（av）的光合作用的速率有关，即每个细胞的〜光子辐照度。 （2）光暗（LD）周期由在光路上的暗区和亮区之间的细胞传播时间决定，应尽可能短，以尽可能接近。光合单位周转时间。在平板反应器中，这可以通过将OP减小到实际可行的程度来实现。

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