光抑制

The results showed that the DF excitation spectrum was obviously similar to the photosynthesis action spectrum; the DF signal changes with the intensity of excitation light source variation behaved as 'photoinhibition' phenomena of photosynthesis; and the DF intensity has an excellent correlation with photosynthesis rate at room temperature.

实验结果表明：延迟荧光激发谱与光合作用谱存在着明显的相似，延迟荧光强度随着激发光源光强的变化表现出类似的光抑制现象，以及在室温条件下延迟荧光强度与光合速率有着很好的相关性。

The results showed that the DF excitation spectrum was obviously similar to the photosynthesis action spectrum; the DF signal Changes with the intensity of excitation light source variation changing behaved as 'photoinhibition' phenomena of photosynthesis; and the DF intensity has an excellent correlation with photosynthesis rate at room temperature.

实验结果表明，延迟荧光激发谱与光合作用谱存在着明显的相似，延迟荧光强度随着激发光源光强的变化表现出类似的光抑制现象，以及在室温条件下延迟荧光强度与光合速率有着很好的相关性。

Rice Photoinhibition of photosynthesis ; Photosynthetic electron transport activities ; Ribulose 1; 5-biphosphate carboxylase

水稻；光合作用的光抑制；光合电子传递活力；二磷酸核酮糖羧化酶

The photoinhibition of photosynthesis of the same plant and the different plant leaves in Qinghai plateau and Shanghai plain were measured by using a portable ADC photosynthetic gas analysis system and a portable CF-1000 fluorometer.

用便携式ADC光合气体分析系统和便携式CF-1000荧光仪对青海和上海的同一植物和不同植物叶片光合作用的光抑制进行了测定。

In iron-deficient cells, photosynthetic pigments content decreased, efficiency of photosynthesis was low, With the increase of the concentration of the iron-chelator 2, 2'-Dipyridyl in media, Fv/Fm decreased, indicating photoinhibition increased, the results were consistent with previous research; Heterocyst induction had one delayed time dependent on the status of iron-deficiency, More severe of the iron-deficiency condition, more late of the heterocyst induction, It is possible that certain iron-related genes may directly regulate heterocyst development; under different iron limitation conditions, Protein pattern were different, more serious of the iron-deficiency conditions, less bands of the protein pattern, We could not find the iron-deficiency induced protein; In general the toxic effects of ROS were potentiated by excess iron, But our results revealed that even under iron-deficiency conditions, Oxidative damage existed.

铁限制的细胞光合色素含量下降，光合作用能力下降，随着铁螯合剂2，2'-dipyridyl浓度的增加，叶绿素荧光F〓／F〓逐渐降低，显示光抑制变强。与前人的研究结果相似；依赖铁缺失状态，异形胞诱导有一段推迟的时间，铁缺失越严重，诱导越迟，推断某些铁相关的基因会直接调节异形胞发育；在不同铁营养条件下，蛋白质图谱的变化趋势很明显，缺铁越严重，则蛋白质谱带数愈少，但本文未能找到特异诱导蛋白；一般认为铁过量情况下ROS产生加强，本文结果显示即便在铁缺失条件下，也有氧化胁迫伤害，而且缺铁越严重，活性氧伤害越大。

Shaded 60%in seedling stage,Fv/Fm and AQY of ginger leaves increased,but MDA content,SOD activity and Pn decreased.Pn,AQY and Fv/Fm of ginger leaves treated with DDTC decreased whether shading or not,but the effect of DDTC on shaded plants was less than that on unshaded plants.

苗期遮荫60%，Fv/Fm与AQY明显提高，MDA含量降低，SOD活性减弱，Pn降低且日变化曲线变为"单峰型"，表明苗期适当遮荫有利于提高光合效率和PSII光化学效率，减轻光抑制和光氧化。

In this paper,we reviewed the sites of damage under chilling temperature,such as effects of low temperature on membrane,two photosystems and some enzymes in Calvin cycle,the chillingsensitive components that exist in plants in vivo and the way of improving the ability of defending photoinhibition under low temperature.

本文论述了低温对植物伤害的原初反应，例如低温对膜的伤害、低温对两个光系统和卡尔文循环中某些酶类的影响，并讨论了植物体内的冷敏感组分以及提高植物防御低温光抑制能力的途径。

At the same time, His, a specific scavenger of singlet oxygen, can remarkably inhibit the degree of destruction of photoinhibition on the components of PS Ⅱ.

同时，加入单线态氧的特异性清除剂组氨酸可明显遏制光抑制处理对PSⅡ各组分的破坏，这些结果说明单线态氧参与了PSⅡ的光破坏过程

When plants absorb more light than that can be used for photosynthesis, the excess energy, which is not promptly quenched, can reduce the photosynthetic efficiency and result in photoinhibition, even photooxidative damage to the photosynthetic reaction center.

然而，大多数情况下植物接受的能量要超过其所能转化的能量，如果过量的光能不及时耗散掉，光合功能会降低，导致光合作用的光抑制，甚至出现光氧化、光破坏。

Thus, it is quite necessary to deeply investigate some related problems, such as stray light transfer, stray light analysis and calculation, stray light suppression method, and baffle system design, bi-directional reflectance distribution function of material surface, and accurate quantitative analysis and measurement of stray light performance of optical systems, like point source transmittance etc.

因此，对系统杂光的产生和传输、分析和计算、杂光抑制措施的采用与遮光系统的设计、材料表面BRDF以及系统杂光PST的定量测试等方面进行深入研究，是非常有必要的。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐