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Tan C.,Yibin University | Wang J.,Yibin University | Wu T.,Yibin University | Qin X.,China Tobacco Chuanyu Industrial Corporation | Li M.,University of Sichuan
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

Based on the combination of uninformative variable elimination (UVE), bootstrap and mutual information (MI), a simple ensemble algorithm, named ESPLS, is proposed for spectral multivariate calibration (MVC). In ESPLS, those uninformative variables are first removed; and then a preparatory training set is produced by bootstrap, on which a MI spectrum of retained variables is calculated. The variables that exhibit higher MI than a defined threshold form a subspace on which a candidate partial least-squares (PLS) model is constructed. This process is repeated. After a number of candidate models are obtained, a small part of models is picked out to construct an ensemble model by simple/weighted average. Four near/mid-infrared (NIR/MIR) spectral datasets concerning the determination of six components are used to verify the proposed ESPLS. The results indicate that ESPLS is superior to UVEPLS and its combination with MI-based variable selection (SPLS) in terms of both the accuracy and robustness. Besides, from the perspective of end-users, ESPLS does not increase the complexity of a calibration when enhancing its performance. © 2010 Elsevier B.V. All rights reserved.

Tan C.,Yibin University | Wang J.,Yibin University | Wu T.,Yibin University | Qin X.,China Tobacco Chuanyu Industrial Corporation | Li M.,University of Sichuan
Vibrational Spectroscopy | Year: 2010

The fast and non-destructive quantization of nicotine is an important task in tobacco industry and near infrared (NIR) spectroscopy appears to provide a chance. However, the successful use of NIR spectroscopy has relied on chemometrics to construct a calibration model with satisfactory accuracy. This work investigated the feasibility of the combination of NIR spectroscopy and boosting partial least squares (boosting-PLS) for the determination of nicotine content in tobacco samples. Full-spectrum PLS and its two most representative modifications, i.e., uninformative variable elimination PLS (UVEPLS) and moving-window PLS (MWPLS) as well as the corresponding local versions of boosting-PLS, i.e., using boosting-PLS in the informative regions found by UVPLS and MWPLS were used for comparison. Prior to modeling, a total of 81 samples were first sorted and then split into 27 subsets, each containing 3 samples. By randomly picking one sample for testing out of each subset, 10 training/test sets were built. Based on a statistical comparison, it is revealed that both boosting-PLS and its local versions can improve the calibration but boosting-PLS behaves the best, meaning that boosting-PLS is not only feasible but can avoid doing a variable/interval selection in such a task. © 2010 Elsevier B.V. All rights reserved.

Xiao H.,Shanghai JiaoTong University | Ding J.,Tianjin Medicine Union Center | Gao S.,Shanghai JiaoTong University | Yang S.,University of Sichuan | And 2 more authors.
Asian Pacific Journal of Cancer Prevention | Year: 2011

It is well-known that tobacco smoke is a definite causative agent important for human health. Epidemiological research has proven that smoking is a cause of various serious and fatal diseases. However, never-smokers comprise a high proportion of non-small-cell lung cancer (NSCLC) patients. To determine whether lung cancer patients in never smokers have different genetic mutations from their counterparts in smokers, we comprehensively searched the Cochrane Library, Medline and EMbase from 1966 to Jun 2010 for the following terms: ("non-smoker" or "never-smoker") and ("lung cancer") and ("gene") limited to English and clinical trials. Although a significant fraction of lung cancers in never smokers may also be attributable to tobacco, many such cancers arise in the absence of detectable tobacco exposure, and may follow a very different molecular pathway of malignant formation, including EGFR gene mutation, P53 mutation and metabolic gene CYP1AIIle462Val polymorphism. These genes will help doctors to separate never-smoker lung cancer from smokers, and may present promising targets for therapy of never-smoker lung cancers. Future efforts should focus on further delineation of underlying biologic differences, identifying potential non-tobacco-related risk factors, and refining treatment strategies for different groups of lung cancerpatients.

Li G.,Henan Agricultural University | Li D.,China Tobacco Chuanyu Industrial Corporation | Wang X.,Henan University of Urban Construction | Guo C.,Henan Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

Steam explosion as an effective pretreatment can separate hemi-cellulose, cellulose and lignin from lignocelluloses such as stalk and wood, and enhance yield of production from lignocelluloses with chemical and biological methods. Energy balance of corn stalk steam explosion and anaerobic fermentation were analyzed based on the experiments in the paper. The energy conversion rate of anaerobic fermentation with steam exploded corn stalk increased with the increasing of steam pressure at the same pressure retention time, and the maximums in the same steam pressure were got at the 90 s pressure retention time in each group. The minimum and maximum energy conversion rates of anaerobic fermentation with steam exploded corn stalk were 8.39% and 11.68% at room temperature, which are 1.38 times and 1.92 times than that of the control. But the analysis of incremental benefit-cost ratio showed the expended energy for steam explosion is greater than the increased additional energy output in anaerobic fermentation with steam exploded corn stalk compared with the control. From this point of view, it is not an economic way for steam explosion method.

Yang S.-J.,University of Sichuan | Yokoyama A.,National Hospital Organization Kurihama Alcoholism Center | Yokoyama T.,Japan National Institute of Public Health | Huang Y.-C.,China Tobacco Chuanyu Industrial Corporation | And 7 more authors.
World Journal of Gastroenterology | Year: 2010

AIM: To evaluate the contribution of alcohol dehydrogenase-1B (ADH1B) and aldehyde dehydrogenase-2 (ALDH2) polymorphisms to the risk of esophageal cancer. METHODS: Nineteen articles were included by searching MEDLINE, EMBASE and the Chinese Biomedical Database, 13 on ADH1B and 18 on ALDH2. We performed a meta-analysis of case-control studies including 13 studies on ADH1B (cases/controls: 2390/7100) and 18 studies on ALDH2 (2631/6030). RESULTS: The crude odds ratio [OR (95% confidence interval)] was 2.91 (2.04-4.14) for ADH1B*1/*1 (vs ADH1B*2/*2) and 1.32 (1.17-1.49) for ADH1B*1/*2. The crude OR for ALDH2*1/*2 (vs ALDH2*1/*1) was 2.52 (1.76-3.61). ADH1B*1/*1 increased the risk of esophageal cancer among never/rare [1.56 (0.93-2.61)], moderate [2.71 (1.37-5.35)], and heavy drinkers [3.22 (2.27-4.57)]. ADH1B*1/*2 was associated with a modest risk among moderate drinkers [1.43 (1.09-1.87)]. ALDH2*1/*2 increased the risk among never/rare [1.28 (0.91-1.80)], moderate [3.12 (1.95-5.01)], and heavy [7.12 (4.67-10.86)] drinkers, and among ex-drinkers [5.64 (1.57-20.25)]. ALDH2*2/*2 increased the risk among drinkers [4.42 (1.72-11.36)]. ADH1B*1/*1 plus ALDH2*1/*2 was associated with the highest risk for heavy drinkers [12.45 (2.9-53.46)]. The results of the meta-regression analysis showed that the effects of ADH1B*1/*1 and ALDH2*1/*2 increased with the level of alcohol consumption. ALDH2*1/*2 was associated with a high risk among Taiwan Chinese and Japanese drinkers, as opposed to a moderate risk among drinkers in high-incidence regions of Mainland China. ADH1B*1/*1 in heavy drinkers and ALDH2*1/*2 in moderate-toheavy drinkers was associated with similarly high risk among both men and women. CONCLUSION: ADH1B/ALDH2 genotypes affect the risk of esophageal cancer, and the risk is modified by alcohol consumption, ethnicity, and gender. © 2010 Baishideng.

Yu C.,Liaoning University of Technology | Sun Y.,Liaoning University of Technology | Sun Y.,China Tobacco Chuanyu Industrial Corporation | Fan X.,Liaoning University of Technology | And 2 more authors.
Particle and Particle Systems Characterization | Year: 2013

Hierarchical carbon-encapsulated iron nanoparticles (Fe@Cs) with typical core/shell structure are successfully synthesized from starch and iron nitrate by an easy-to-handle process at different carbonization temperatures (600-1000 °C). The nanoparticles are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), nitrogen adsorption, and Fourier transform infrared spectroscopy (FTIR). The results show that the carbonization temperature has an important effect on the morphology, the core shape, the diameters, and the porous structure as well as performance of Fe@Cs. Fe@C samples carbonized at 900°C (Fe@C-900) show the relatively perfect quasi-spherical bcc-Fe core/carbon shell porous structure and their diameters are in a narrow range of 20-50 nm. The adsorption capabilities of Fe@C samples obtained at different carbonization temperatures for removal of thiophene from model oils are evaluated and compared in a batch-type adsorption system. It has been found that among all of the samples measured, Fe@C-900 shows the highest adsorption capability with an increase of 54% for thiophene in comparison with that of the commercial activated carbon. The feasibility of the as-prepared Fe@C-900 as a magnetically separable adsorbent is also demonstrated. Self-assembled chains of magnetic nanoparticles embedded in a bulk polymer are prepared by thermally curing a dispersion of the nanoparticles in a liquid monomer under the application of a magnetic field. Repulsive forces between the chains cause them to assemble into an array with quasiperiodic, micrometer-scale spacing, and the chains exhibit enhanced magnetic anisotropy along the chain axis. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

China Tobacco Chuanyu Industrial Corporation | Date: 2012-10-31

This invention involves a type of composite filter tips, which contains biological composition adhering to the carrier that is added to the tow filter rod when the rod is made. The biological composition consists of cobalt porphyrin and ginkgo leaf extract, and the mass ratio of the former to the latter is 1:1~80. Such filter tip can not only reduce releasing quantity of harmful ingredients such as free radical, benzopyrene [a] and tobacco specific nitrosamine in smoke, but also make acute toxicity, subchronic toxicity, cytotoxicity and mutagenicity lower than those of the control group. In addition, no adverse impact is imposed on smoking quality of the cigarette.

China Tobacco Chuanyu Industrial Co. and China Tobacco Chuanyu Industrial Corporation | Date: 2012-04-03

Ashtrays for smokers; Cigar cases; Cigarette cases; Cigarettes; Cigarillos; Cigars; Humidors; Tobacco; Tobacco jars; Tobacco pipes.

China Tobacco Chuanyu Industrial Co. and China Tobacco Chuanyu Industrial Corporation | Date: 2012-05-29

Ashtrays for smokers; Cigar cases; Cigarette cases; Cigarettes; Cigarillos; Cigars; Humidors; Tobacco; Tobacco jars; Tobacco pipes.

PubMed | China Tobacco Chuanyu Industrial Corporation, Anhui University of Science and Technology and China Tobacco Anhui Industrial Corporation
Type: | Journal: Talanta | Year: 2016

In this paper, a novel dummy template molecularly imprinted polymer (DMIP) based on a vinyl-SiO2 microspheres surface for the simultaneous selective recognition and enrichment of 18 amino acids was prepared via a surface molecular imprinting technique using theanine as a dummy template. Compared to the imprinted polymers prepared using traditional polymerization techniques, the obtained DMIPs exhibited a regular spherical shape and were relatively monodisperse. The maximal sorption capacity (Qmax) of the resulting DMIPs for the 18 amino acids was up to 1444.3 mg g(-1). A kinetic binding study showed that the sorption capacity reached 85.40% of Qmax in 25 min and sorption equilibrium at 30 min. The imprint factors of the sorbents ranged from 2.86 to 6.9 for the 18 amino acids, which indicated that the DMIP sorbents have high selectivity. An HPLC-UV method for the simultaneous determination of 18 amino acids in tobacco and tobacco smoke was developed using the DMIPs as sorbents for solid phase extraction (SPE) in the sample pretreatment procedure. Under the optimum experimental conditions, the materials had enrichment factors of up to 200 for the amino acids, and the recoveries of the 18 amino acids in tobacco smoke were in the range from 79% to 104% with relative standard deviations of less than 7.4%. It indicated that the obtained DMIP sorbents could specifically recognize the amino acids from complicated samples.

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