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fluorescence yield
相关语句
  荧光产额
     THE PRIMARY FLUORESCENCE YIELD OF THE LINE OF INTEREST IN EPMA
     在EPMA中分析线的初级荧光产额
短句来源
     For incident protons with energies from 0.5 to 1 MeV,a good agreement between theoretical Au LX ray relative production cross sections calculated by using the RPWBA BC(relativistic plane wave Born approximation with the binding and Coulomb deflection corrections) ionization cross sections and experimental data was obtained when the experimental L 1 subshell fluorescence yield was adopted instead of the corresponding Dirac Hartree Slater value in the calculations.
     对于能量为0.5-1MeV的入射质子,在计算中采用AuL1次壳层荧光产额的实验值代替相应的Dirac-Hartree-Slater值时,使用RPWBA-BC(经结合能和库仑歪曲修正的相对论平面波玻恩近似)电离截面计算得到的金原子LX射线相对产生截面与测量值相符。
短句来源
     Secondly, the study of the properties of photosensitizers, which mainly including the fluorescence yield, spectral properties, photobleaching properties of photosensitizers were carried out.
     第二部分阐述了研究光敏剂特性的主要理论问题:浓度、荧光产额、光谱特性、光漂白特性等。
短句来源
     The energies of X ray and Auger electron can be calculated on the basis of atomic electron binding energies in different atomic shells. The intensities of X ray and Auger electron can be also calculated from vacancy number, X ray fluorescence yield and vacancy transfer coefficient of different atomic shells.
     X射线和俄歇电子的能量由原子电子结合能计算得到 ,X射线和俄歇电子的强度分别由内转换电子发射和电子俘获在原子电子壳层内留下的空穴数 ,X射线荧光产额 ,和空穴转移系数计算得到 .
短句来源
  荧光产量
     nevertheless, the ratio of the relative fluorescence yield of PS Ⅱ (F687)to that of PSⅠ(F742) , the activity and efficiency of primary conversion of light energy of PS Ⅱ in high-light wheat chloroplasts were raised by Mg2+ accordnig to a bigger margin.
     但它更大幅度地提高后者在低温(77K)下的PSⅡ相对荧光产量(F_(687))与PSⅠ相对荧光产量(F_(742))的比值,PSⅡ活性和PSⅡ原初光能转化效率。
短句来源
     The addition of Mg~(++) increases the relative fluorescence yield of F 685 and decreases that of F 735 for FDM. However, there is almost no effect of Mg~+ on the fluorescence emission spectra for IDM.
     Mg~(2+)提高正常叶绿体F_(685)相对荧光产量,降低F_(735)的相对荧光产量,而对发育不完善的叶绿体膜的荧光发射几乎不发生影响。
短句来源
     The experimental results demonstrated that in 60 and 90 NTU turbid solutions fluorescence yield(F_t),maximum light-adapted fluorescence yield(F′_m) and ΔF_v/F_m were less significantly than those in the control and 30 NTU solution.
     结果表明,在60、90 NTU的悬浮泥沙溶液中金鱼藻叶片的荧光产量(Ft)、光适应最大荧光产量(Fm′)和有效荧光产量(ΔFv/Fm)都显著低于对照和30 NTU的植株。
短句来源
     Exogenous active oxygen species decreased Fv/Fm to different degrees, 1 O2 decreased significantly Fv/Fm and PSⅡ (Fig. 3) During the induction of chlorophyll fluorescence quenching by exogenous active oxygen species, H2O2 lowed the chlorophyⅡ fluorescence yield, and increased qP PS Ⅱ qN andKD(Fig- 4).
     H2O2在诱导叶绿体荧光猝灭过程中,引起荧光产量降低,而使qp、qN、ΦPSⅡ、KD上升;
短句来源
     In addition, the added histidine suppressed the decrease of 77 K fluorescence yield of PSⅠ particles during the illumination.
     外加组氨酸还可以有效地抑制光照过程中PSⅠ颗粒 77K荧光产量的下降。
短句来源
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  “fluorescence yield”译为未确定词的双语例句
     Their fluorescence spectra (77 K) have one prominent chlorophyll emission peak at 685 nm. By comparison with Fe-replete cells (10 μmol·L -1), the fluorescence yield from 685 nm band increased by about 2 times in Fe deplete cells (5 nmol·L -1),and about 1.4 times in low iron cells (100 nmol·L -1),respectively.
     赤潮异弯藻细胞低温荧光发射光谱在 6 85nm处有一明显的发射峰 ,与铁丰富条件 (10 μmol·L-1)相比 ,缺铁 (5nmol·L-1)和低铁 (10 0nmol·L-1)细胞在 6 85nm处的荧光得率分别升高了 2倍和 1.4倍 .
短句来源
     The results showed that NaCl stress decreased plant growth, chlorophyll content, quantum yield of PSII (ΦPSII),initial fluorescence yield(Fo)and non-photochemical quenching of fluorescence(NPQ).
     结果表明,NaCl胁迫明显降低植株生长量、叶片叶绿素含量、PSII非环式电子传递量子效率(ΦPSⅡ)、初始荧光(Fo)和非光化学猝灭系数(NPQ),而对光化学效率(Fv/Fm)的影响不大。
短句来源
     Time-resolved fluorescence measurements by multi-frequency phasemodulation method suggest that D1/ D2/cyt b559 photosystem Ⅱ reaction center cmplex has four fluorescence components with lifetimes of about 1. 0, 6. 0, 24 and 73 ns, which form 0. 05, 0. 34, 0. 35 and 0. 26 respectively of the total fluorescence yield (Table 1). The 6. 0 ns fluorescence component corresponds to chlorophyll a which is energctically uncoupled fromcharge separation.
     通过多频相位调制法测得菠菜叶绿体光系统Ⅱ(PSⅡ)反应中心D1/D2/cytb559复合物的荧光衰减包括4个组分,其寿命分别大约为1、6、24和73ns,所占整个荧光的比例依次为5%、34%、35%和26%。
短句来源
     Chlorophyll a fluorescence measurements showed a variable reduced fluorescence yield ( F v/F o ) which indicated that PSⅡ was impaired and the CO 2 assimilation was disturbed by CMV infection.
     叶绿素a荧光测定表明还原态Q库减少 ,CO2 同化减少。
短句来源
     It is carried out that the dependence of the fluorescence yield efficiency on the excitation wavelength for a kind of diesel oil The results show that the best excitation wavelength for the oil is 470nm and the efficiency decrease rapidly as the excitation wavelength deviates from the optimum value
     对一种应用广泛的柴油———“美孚黑霸王”的荧光产生效率与激发光波长的关系进行了实验研究。 结果表明 ,这种油的最佳激发波长为 4 70nm ,用偏离这一波长的光激发时 ,荧光产生效率迅速下降 ,而用波长 355nm的光激发时 ,荧光产生效率不足最大值的 1/6
短句来源
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  fluorescence yield
Activation of Chlororespiration Increases Chlorophyll Fluorescence Yield in Chlorella Adapted to Darkness at High Temperature
      
A tenfold increase in chlororespiration during dark incubation of Chlorella perynoidosa Chick CALU-175 at high temperature doubled the initial chlorophyll fluorescence yield (F0).
      
The induction of variable chlorophyll fluorescence yield in the light differed greatly at pH 6.5 and 8.5.
      
While at pH 6.5 the fluorescence yield, after an initial fast rise almost to Fmax, only slightly decreased, at pH 8.5 after such a rise it dropped promptly to a low value.
      
In one case this quenching occurs as light-induced decrease of the fluorescence yield of long-wavelength chlorophylls of the photosystem I trimers induced by inactive reaction centers: P700 cation-radical or P700 in triplet state.
      
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The effects of various concentrations of linolenic acid on the structure and the absorption and fluorescence spectra of wheat chloroplast membranes were studied. Linolenic acid increases the absorption peaks in both red and blue regions of the chloroplast membranes.The degree of increase in the absorption peaks is propor- tional to the concentration within a range of concentration.Linolenic acid increased the fluorescence yield of F_(685) and F_(738) of chloroplast membranes.Electron microscopical studies...

The effects of various concentrations of linolenic acid on the structure and the absorption and fluorescence spectra of wheat chloroplast membranes were studied. Linolenic acid increases the absorption peaks in both red and blue regions of the chloroplast membranes.The degree of increase in the absorption peaks is propor- tional to the concentration within a range of concentration.Linolenic acid increased the fluorescence yield of F_(685) and F_(738) of chloroplast membranes.Electron microscopical studies revealed that the increases were mainly due to the disappearance of grana stacks and the unfolding of thylakoid membranes. The causes of effects of linolenic acid on the absorption and fluorescence spectra and the structure of chloroplast membranes as well as the reversion and regulation by MgCl_2 were discussed.

研究不同浓度的亚麻酸对小麦叶绿体膜结构、吸收光谱和荧光光谱的影响。观察到亚麻酸对叶绿体结构有显著的影响,并可提高叶绿体囊状体膜在蓝区和红区的吸收峰值,以及 F_(685)和 F_(738)的相对荧光产量。这些影响随着亚麻酸浓度的提高而加剧。此外,观察到 MgCl_2能够部分逆转亚麻酸所引起的叶绿体膜结构的变化,并能部分恢复囊状体膜吸收光谱的变化;同时,MgCl_2可进一步提高亚麻酸处理后叶绿体的 F_(685)相对荧光产量,但 F_(738)的相对荧光产量几乎不受影响。

The accuracy of quantitative analysis of thin foils in The energy dispersive x-ray spectrometer, EDAX9100, has been measured with samples of k-nown composition.The results indicate that at 100KV, a relative error of 5-10% Can be achived using The EDAX9100 program when K-K or L-L x-ray Lines of elements with close atomic number are being analyzed . The relative error becomes progressively worse,up to abont 20% to 50% if The difference in atomic number betwen The two analyzed elements increaces, and the different...

The accuracy of quantitative analysis of thin foils in The energy dispersive x-ray spectrometer, EDAX9100, has been measured with samples of k-nown composition.The results indicate that at 100KV, a relative error of 5-10% Can be achived using The EDAX9100 program when K-K or L-L x-ray Lines of elements with close atomic number are being analyzed . The relative error becomes progressively worse,up to abont 20% to 50% if The difference in atomic number betwen The two analyzed elements increaces, and the different x-ray lines are analgzed.The absorption of thin film specimens has been studied The results indicate that x-ray absorption within the sample must be Considered when there is a significant difference in The energy of The Characteristic x-raysAt lower voltages a correction must be applied to the K factor in the EDAX9100 program . The EDAX9100 program must be Corrected for using iines from different x-rag shells.Reasonable equations for calculating the lonization cross section and fluorescence yields have been Chosen, and the ratio of coefficients of K, L and M shell lines have been calculated to be qK:bL:bM = 0.35:0.35:0.24.The relative error after correcting the program for absorption,voltage,and different x-ray shells, is less than 10% for all x-ray lines analyged.

本文通过在EM400T透射电镜上用一些标准成分的样品进行薄膜无标样成份分析实验,检验了EDAX9100能谱仪的分析准确度。在本试验所用的样品范围内,其准确度为:近邻元素同一X光线系分析相对误差为5~10%,非近邻元素不同线系分析相时误差较大,可达20~50%。试验证明在分析元素的质量吸收系数之差Δμ较大时,还必须考虑吸收修正。通过对K因子的讨论,得出与本实验结果符合比较好的薄膜能谱理论公式组合为:取BeThe—Powell公式的电离截面Q_(BP)∞(1n0.65U)/U·Ej~2,K系、L系、M系的线系常数调整后取b_K:b_L:b_M=0.35:0.35:0.24,荧光产额用Bambynek的ω_K和wentzel的ω_L和ω_M。用以上公式组合并经过吸收修正,对所有线系计算结果相对误差小于10%。

The effects of Mg~(++) on the fluorescence emission and excitation spectra of two kinds of incompletely developed membranes (IDM) and fully developed membranes (FDM) of wheat chloroplasts were investigated. It is shown that noticeable differences exist between the fluorescence spectra of two kinds of IDM and FDM. The ratios of F 685/F 735 for FDM and IDM are 0.81 and 5.83, respectively. IDM contained little or no Chl b or carotenoids. The addition of Mg~(++) increases the relative fluorescence yield of...

The effects of Mg~(++) on the fluorescence emission and excitation spectra of two kinds of incompletely developed membranes (IDM) and fully developed membranes (FDM) of wheat chloroplasts were investigated. It is shown that noticeable differences exist between the fluorescence spectra of two kinds of IDM and FDM. The ratios of F 685/F 735 for FDM and IDM are 0.81 and 5.83, respectively. IDM contained little or no Chl b or carotenoids. The addition of Mg~(++) increases the relative fluorescence yield of F 685 and decreases that of F 735 for FDM. However, there is almost no effect of Mg~+ on the fluorescence emission spectra for IDM. The results can be explained by the lack of light-harvesting chlorophyll a/b) protein complex and peripheral antenna or internal antenna in IDM.

小麦发育完善和发育不完善叶绿体膜的低温荧光光谱有着明显的区别,发育完善的叶绿体膜的F_(685)/F_(735)比值为0.81,而发育不完善的叶绿体膜的F_(684)/F_(725)比值却为5.83。发育不完善的叶绿体含有很少或不含叶绿素b及类胡萝卜素。Mg~(2+)提高正常叶绿体F_(685)相对荧光产量,降低F_(735)的相对荧光产量,而对发育不完善的叶绿体膜的荧光发射几乎不发生影响。这和它缺乏捕光叶绿素a/b蛋白复合物及PSI外周天线或内侧天线有关。

 
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