中国科技论文在线

上传时间

2009年05月12日

【期刊论文】Simultaneous determination of tin, germanium and molybdenum by diode array detection-flow injection analysis with partial least squares calibration model

李梦龙， Xiaoli Zoua， Yuanqian Lia， ∗， Menglong Lib， Bo Zhenga， Jingguo Yangc

Talanta 62(2004)719-725，-0001，（）：

-1年11月30日

摘要

Simultaneous determination of tin, germanium and molybdenum in food samples has been established by flow injection-charge coupled detector (CCD) diode array detection spectrophotometry with partial least squares (PLS) algorithm. The methodwas based on the chromogenic reaction of metal ions and salicylflurone in the presence of cetyltrimethyl ammonium bromide. The overlapping spectra of these complexes are collected by CCD diode array detector and the multi-wavelength absorbance data are processed using partial least squares algorithm. The reaction conditions and analytical parameters of flow injection analysis have been investigated. The method was applied to directly determine Ge, Mo and Sn in several food samples after digestion with satisfactory results. The recoveries of spiked samples were 80.0-102.0% for tin, 86.3-92.0% for germanium and 83.2-95.2% for molybdenum, and the relative standard deviations for samples were 4.4-7.8%. Molybdenum in certified reference material of cattle liver was determined by the proposed method (n=8). The differential values between determined and guarantee values were within the given uncertain value ranges (t=1.687,P>0.05 for t-test). The samples of mung bean, kelp and pork liver were analyzed by the proposed method and inductively couple plasma-atomic emission spectroscopy (ICP-AES) method. The determination results of the two methods are in good agreement. The sampling rate is 30 samples h−1.

Germanium， Molybdenum， Tin， Flow injection analysis， CCD diode array detector， Partial least squares， Salicylflurone， Food analysis

34浏览
0点赞
0收藏
0分享
117下载
0

引用

上传时间

2009年05月12日

【期刊论文】Analyzing functional similarity of protein sequences with discrete wavelet transform

李梦龙， Zhi-ning Wena，， Ke-long Wanga， Meng-long Lia， b， ∗， Fu-sheng Nieb， Yi Yangc

Computational Biology and Chemistry 29(2005)220-228，-0001，（）：

-1年11月30日

摘要

This paper applies discrete wavelet transform (DWT) with various protein substitution models to find functional similarity of proteins with low identity. A new metric, 'S' function, based on the DWT is proposed to measure the pair-wise similarity. We also develop a segmentation technique, combined with DWT, to handle long protein sequences. The results are compared with those using the pair-wise alignment and PSI-BLAST.

Discrete wavelet transform， Protein sequence analysis， Substitution model， Functional similarity e， v， a， l， uation

32浏览
0点赞
0收藏
0分享
84下载
0

引用

上传时间

2009年05月12日

【期刊论文】Substructure Prediction from Infrared Spectra by Using Support Vector Machines

李梦龙， Jun Hong LIU， Min Chun LU， Fu Sheng NIE， Xiao Yu FENG， Meng Long LI∗

Chinese Chemical Letters Vol. 16, No.10, pp 1354-1356, 2005，-0001，（）：

-1年11月30日

摘要

The potential of support vector machines (SVMs) for the substructure elucidation of infrared spectra have been investigated. The trained SVMs can identify the 16 substructures with high accuracy.

Infrared spectra,， substructures,， support vector machines.，

41浏览
0点赞
0收藏
0分享
64下载
0

引用

上传时间

2009年05月12日

【期刊论文】A New Hybrid Model of Amino Acid Substitution for Protein Functional Classification

李梦龙， Ke Long WANG，， Zhi Ning WEN， Fu Sheng NIE， Meng Long LI， ∗

Chinese Chemical Letters Vol. 16, No.8, pp 1133-1136, 2005，-0001，（）：

-1年11月30日

摘要

In this paper, a new hybrid model of amino acid substitution is developed and compared with the others in previous works. The results show that the new hybrid model can characterize the protein sequences very well by calculating Fisher weights, which can denote how much the variants contribute to the classification.

Hybrid model of amino acid substitution,， protein functional classification,， Fisher weights.，

52浏览
0点赞
0收藏
0分享
61下载
0

引用

上传时间

2009年05月12日

【期刊论文】Application of Embedded Zerotree Wavelet to the Compression of Infrared Spectra

李梦龙， Meng Long LI*， Hua Yi QI， Fu Sheng NIE， Zhi Ning WEN， Bin KANG

Chinese Chemical Letters Vol. 14, No.11, pp 1193-1195, 2003，-0001，（）：

-1年11月30日

摘要

In this paper the embedded zerotree wavelet (EZW) method and Huffman coding are proposed to compress infrared (IR) spectra. We found that this technique is much better than thers in terms of efficiently coding wavelet coefficients because the zerotree quantization is an effective way of exploiting the self-similarities of wavelet coefficients at various resolutions.

Embedded zerotree wavelet,， compress,， infrared spectra,， wavelet transform.，

63浏览
0点赞
0收藏
0分享
58下载
0

引用