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Search Results: 1 - 10 of 14132 matches for " Qiuxia Lei "
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Pyranine Fluorescence Quenching for the Characterization of Solutions  [PDF]
Qiuxia Wang, Kris A. Berglund
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.71005
Abstract: Fluorescence quenching of pyranine by tryptophan, phenylalanine, and nicotinic acid was investigated by using steady state and time resolved fluorescence spectroscopy. On a comparative basis, nicotinic acid is a very strong quencher of pyranine fluorescence, tryptophan is a moderate quencher and phenylalanine is a weak quencher. The strong quenching is the result of the hydrogen bonding complex between pyranine and amine which existed in both tryptophan and nicotinic acid. Contact complex will form between phenylalanine and pyranine which is the reason of quenching of pyranine by phenylalanine. Associates will form in tryptophan and phenylalanine due to the zwitterion +H3NRCOO- or/and hydrogen bond. Higher concentrations favor the formation of aggregates in the supersaturated solution which made the quenching curve different from unsaturated solution dramatically.
Detection of SNPs in the Cathepsin D Gene and Their Association with Yolk Traits in Chickens
Qian Sheng, Dingguo Cao, Yan Zhou, Qiuxia Lei, Haixia Han, Fuwei Li, Yan Lu, Cunfang Wang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0056656
Abstract: CTSD (Cathepsin D) is a key enzyme in yolk formation, and it primarily affects egg yolk weight and egg weight. However, recent research has mostly focused on the genomic structure of the CTSD gene and the enzyme’s role in pathology, and less is known about the enzyme’s functions in chickens. In this paper, the correlations between CTSD polymorphisms and egg quality traits were analyzed in local Shandong chicken breeds. CTSD polymorphisms were investigated by PCR-SSCP (polymerase chain reaction single strand conformation polymorphism) and sequencing analysis. Two variants were found to be associated with egg quality traits. One variant (2614T>C), located in exon 3, was novel. Another variant (5274G>T), located in intron 4, was previously referred to as rs16469410. Overall, our results indicated that CTSD would be a useful candidate gene in selection programs for improving yolk traits.
Fundamental solutions and eigenvalues of a differential operator with indefinite weight
Qiuxia Yang
International Journal of Mathematical Analysis , 2012,
Collective Bargaining System in the Game between Labor and Capital: Vacancy and Reconstruction
Qiuxia Tan
Asian Social Science , 2013, DOI: 10.5539/ass.v9n5p128
Abstract: Implementation of collective bargaining system in China is not only an issue of straightening out the labor relationship, but an economic issue of economics and even a social issue. In China, a lot of difficulties still exist in implementation of collective bargaining system, including obstacles in terms of system and obstruction in terms of institution. The three labor rights are the basis and guarantee of collective bargaining system and collective bargaining separating from the three labor rights may cause the system to be a mere formality. An analysis of the reasons for vacancy in the collective bargaining system can be reconstructed from the following three aspects, namely, prescribing the right to strike of laborers, reforming the current wage system and funds system of the trade unions, positively carrying out industrial collective bargaining and promoting establishment of multi-level collective bargaining to help resolve predicament in collective bargaining faced up in China.
The Absent Presence: A Study of Percival in The Waves
Qiuxia Li
English Language and Literature Studies , 2011, DOI: 10.5539/ells.v1n1p77
Abstract: Percival is a character in Woolf’s novel The Waves, about whom few studies have been made about because throughout the novel he is silent and absent, which makes him unnoticeable. However, in spite of his absence, he is repeatedly present in other six characters’ monologues. His absent presence makes his image more mysterious and ambiguous. In a sense, he plays a most important role in the novel. He could be interpreted in different, even contradictory ways.
A transformation formula for a special bilateral basic hypergeometric 12Y12 series
Zhizheng Zhang and Qiuxia Hu
Abstract: . In this short note, we shall make use of the decomposition of series to derive a transformation formula for a bilateral basic hypergeometric 12Y12 series.
A transformation formula for a special bilateral basic hypergeometric 12Y12 series
Zhizheng Zhang,Qiuxia Hu
Abstract: In this short note, we shall make use of the decomposition of series to derive a transformation formula for a bilateral basic hypergeometric 12Y12 series.
A Discontinuous Sturm-Liouville Operator With Indefinite Weight
Qiuxia Yang,Wanyi Wang
Journal of Mathematics Research , 2010, DOI: 10.5539/jmr.v2n3p161
Abstract: In this paper, we consider an indefinite Sturm-Liouville operator with eigenparameter-dependent boundary conditions and transmission conditions. In an appropriate space K, we define a new self-adjoint operator A such that the eigenvalues of A coincide with those of such a problem and obtain asymptotic approximation for its eigenvalues and eigenfunctions.
Effect of electromagnetic field on the behavior and distribution of the particles in front of metallic solidification interface

SUN Qiuxia,ZHONG Yunbo,REN Zhongming,LOU Lei,DENG Kang,XU Kuangdi,

金属学报 , 2005,
Abstract: The quantitative relationship between the nonmetallic particle's redistribution in metal and electromagnetic force (EMF) was developed during the process of unidirectional solidification in electromagnetic field. It was pointed theoretically that controlling the cycle of the electromagnetic field and the solidified parameters could produce a new composite material in which the content of the particles is a function of the unidistance from the growing interface. Experimental results show that by applying periodical electromagnetic force to the unidirectionally solidified hypereutectic Al-19%Si alloy, the primary silicon-rich particles distributed layer by layer, and the surface hardness fluctuated periodically. Through adjusting the frequency of the electromagnetic force and the rate of the solidifying interface, the width between the two adjacent layers could be changed freely.
Determination of Sedative Component in Chinese Medicines by High Resolution Chromatography-Electron Impact-Mass Spectrometry  [PDF]
Changming Zhang, Dongmei Huang, Qiuxia Cheng, Zhanggen Huang
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2012, DOI: 10.4236/jasmi.2012.21003
Abstract: The sedative compounds in two traditional Chinese medicines were studied. These compounds are present in the medicinal herbs “Zao Ren” and “Lu Lu Tong”. The samples were first extracted by ethanol and pre-treated by ultrasonic wave, and then they were separated and qualitatively analyzed by high-resolution GC-EI-MS and High Performance Liquid Chromatography (HPLC) systems. We have found that the Chinese herb medicines “Zao Ren” contained clonazepam (120 ppm), whereas “Lu Lu Tong” Chinese drug contained estazolam (270 ppm). The Analytical measurements were done by using three different diagnostic indices using the GC-retention time of the GC-EI-MS total –ion–chromatogram; single stage EI-MS analysis identification and from the measurements of the retention time in the HPLC.
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