Perturbation of the tris(2,2′‐bipyridine) ruthenium(II)‐catalyzed Belousov–Zhabotinsky oscillating chemiluminescence reaction by l‐cysteine and its application

Perturbation of the tris(2,2′‐bipyridine)ruthenium(II) [Ru(bpy)₃²⁺]‐catalyzed Belousov–Zhabotinsky (BZ) oscillating chemiluminescence (CL) reaction induced by l ‐cysteine was observed in the closed system. It was found that the CL intensity was decreased in the presence of l ‐cysteine. Meanwhile, oscillation period and oscillating induction period were prolonged. The sufficient reproducible induction period was used as parameter for the analytical application of oscillating CL reaction. Under the optimum conditions, the changes in the oscillating CL induction period were linearly proportional to the concentration of l ‐cysteine in the range from 8.0 × 10^?7 to 5.0 × 10^?5 mol L^?1 (r = 0.997) with a detection limit of 4.3 × 10^?7 mol L^?1. The possible mechanism of l ‐cysteine perturbation on the oscillating CL reaction was also discussed. Copyright © 2009 John Wiley & Sons, Ltd.     

The visualization of natural luminescence of living cotton hairs.

Super-weak luminescence of individual living cotton cells was investigated. This phenomenon was observed under an optical microscope using a replica-reprint technique in conjunction with living cotton cells. Gelatin solution was used for visualization of luminescence in a polymer film deposited on the cotton cells. No luminescence was generated in dead and very young plant cells (1 day after flowering) but maximal luminescence was detected from apical parts of cotton hairs in the early growth stage (4-6 days after flowering). Emitted luminescence had a cone-like form for different varieties of cotton plants. This indicates a focusing of radiation connected with morphological and structural features of the apical part of cotton cells at early stages of their evolution. The electromagnetic nature of cotton cell luminescence has been shown by experiments using photomultiplier (PEM) sensing of ultraviolet radiation. Insertion of a cotton seed-bud in darkness on a PEM window increased the dark current by 6-8%. Radiation flux from developing cotton hair is actually more intense, but through the PEM window only a small part of the radiation was detected.     

毛细管内均相辣根过氧化物酶（HRP）与核酸杂交偶联HRP催化化学发光比较研究

目的：了解毛细管内核酸偶联和游离辣根过氧化物酶（HRP）催化化学发光差异。方法：不同浓度HRP和经核酸杂交固定于毛细管内壁HRP催化化学发光反应。结果：①游离HRP催化化学发光线性检测范围窄（2.7×10-5-1.3×10-6mg/ml,R2〉0.96）,下限为1.0×10-7mg/ml;②2.0×1014-2.0×106copies/ml的5μl单链DNA杂交后,1.0-10min时DNA浓度M对数（lgM）与化学发光I值线性相关（R2〉0.99）,且大于阴性I值平均数＋3倍标准偏差（s.d）;③5.0×1011-5.0×106copies/ml的5μl PCR产物杂交后,10min内PCR产物对数lgM与I值线性相关（R2〉0.97）,且大于阴性I值平均数＋3倍标准偏差（s.d）。4.0-7.0min内lgM与I值的R2〉0.99,3次平行检测标准偏差〈5.0%。结论：毛细管内核酸杂交的HRP催化化学发光检测线性范围宽、灵敏度高、底物用量少,有望用于临床核酸分子杂交检测。     

毛细管内均相辣根过氧化物酶(HRP)与核酸杂交偶联HRP 催化化学 发光比较研究

目的:了解毛细管内核酸偶联和游离辣根过氧化物酶(HRP)催化化学发光差异。方法:不同浓度HRP和经核酸杂交固定于毛细管内壁HRP催化化学发光反应。结果:①游离HRP催化化学发光线性检测范围窄(2.7×10-5-1.3×10-6mg/ml,R2>0.96),下限为1.0×10-7mg/ml;②2.0×1014-2.0×106copies/ml的5μl单链DNA杂交后,1.0-10min时DNA浓度M对数(lgM)与化学发光I值线性相关(R2>0.99),且大于阴性I值平均数+3倍标准偏差(s.d);③5.0×1011-5.0×106copies/ml的5μl PCR产物杂交后,10min内PCR产物对数lgM与I值线性相关(R2>0.97),且大于阴性I值平均数+3倍标准偏差(s.d)。4.0-7.0min内lgM与I值的R2>0.99,3次平行检测标准偏差<5.0%。结论:毛细管内核酸杂交的HRP催化化学发光检测线性范围宽、灵敏度高、底物用量少,有望用于临床核酸分子杂交检测。