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58 results

  1. TSRC, Tob. Sci. Res. Conf., 2018, 72, abstr. 013

    Method development for pH analysis of ends aerosol and e-liquid

    HEFNER T.(1); ST. CHARLES F.K.(2); ANDERSON J.(3)
    (1) R.J. Reynolds Tobacco Company, Winston Salem, NC, USA; (2) St.Charles Consultancy, Winston Salem, NC, USA; (3) Eurofins Lancaster Labs, Winston Salem, NC, USA
    E-liquids are hygroscopic, non-aqueous liquids containing a small amount of water (~3-15%). When the pH of a non-aqueous liquid is measured using conventional methods and calibration buffers, the value can only be regarded as an "apparent pH". ...
  2. CORESTA Meeting, Agronomy/Phytopathology, 2017, Santa Cruz do Sul, AP 29

    Comparative proteomic analysis reveals differential protein and energy metabolisms from two tobacco cultivars in response to cold stress

    HU Risheng(1); ZHU Xianxin(2); XIANG Shipeng(1); YANG Chengwei(3); LAI Jianbin(3); ZHANG Xianwen(2); LIU Zhi(2); ZHU Lieshu(2)
    (1) Central South Agricultural Experiment Station of CNTC, Changsha, P.R. China; (2) Hunan Agricultural University, Changsha, P.R. China; (3) South China Normal University, Guangzhou, P.R. China
    Given the development of tobacco is sensitive to low temperature, cold stress is a critical problem for tobacco production. Uncovering of the mechanisms for cold response in tobacco would contribute to improving its cold tolerance, but the precise ...
  3. TSRC, Tob. Sci. Res. Conf., 2016, 70, abstr. 77

    A robust method for evaluating the pH of e-liquids

    ST. CHARLES F.K.(1); MOLDOVEANU S.(2); SCOTT W.(2)
    (1) St. Charles Consultancy, Lewisville, NC, USA; (2) R.J. Reynolds Tobacco Co., Winston-Salem, NC, USA
    The measurement of pH is one of the simplest and most common analytical methods practiced in the laboratory. The pH-meter is calibrated using certified buffers, the electrode is placed in the solution, and if a reading is obtained, the value is used. In ...
  4. TSRC, Tob. Sci. Res. Conf., 2014, 68, abstr. 40

    Nicotine activity in tobacco

    ST.CHARLES F.K.(1); MOLDOVEANU S.C.(2)
    (1) St. Charles Consultancy, Lewisville, North Carolina, USA; (2) R.J. Reynolds Tobacco Company, Winston-Salem, North Carolina, USA
    The vapor pressure of pure nicotine has been reported in the literature. However, to the best of our knowledge, measurements of the vapor pressure of nicotine from tobacco have not been reported. Nicotine migration from tobacco to cigarette filters during ...
  5. TSRC, Tob. Sci. Res. Conf., 2013, 67, abstr. 38

    The migration during storage, transfer to smoke, and filtration efficiency of nicotine, glycerin, and propylene glycol in cigarettes.

    ST. CHARLES F.K.(1); MOLDOVEANU S.C.(2); MILLS H.D.(2); ANDRESEN N.P.(2)
    (1) St.Charles Consultancy, Winston-Salem, NC, USA; (2) R.J. Reynolds Tobacco Co., Winston Salem, NC, USA
    This study evaluated the migration during storage, transfer to smoke and filtration of nicotine, glycerin and propylene glycol (PG) for cigarettes with cellulose acetate/triacetin filters. Filtration efficiency (FE) and smoke yields were studied for two ...
  6. TSRC, Tob. Sci. Res. Conf., 2012, 66, abstr. 62

    The quantitative estimation of toxicant dose to cigarette smokers

    ST. CHARLES F.K.(1); MCAUGHEY J.(2); SHEPPERD J.(2)
    (1) St. Charles Consultancy, Winston Salem, NC, USA; (2) British American Tobacco (Investments) Limited, Southampton, UK
    For the risk assessment of cigarette smoke, a reliable estimate of the mass of chemical compounds retained in the body would be beneficial. Filter studies provide estimates of mouth exposure to compounds in cigarette smoke, but do not account for mouth ...
  7. Tobacco Science & Technology, 2012, 11, p. 69-73, ISSN.1002-0861

    Geostatistics-based evaluation of main nutrients in Qujing tobacco planting soil

    LI Qiang(1); ZHOU Jiheng(*1,2); ZHANG Yiyang(1); ZHANG Zhengyan(2); XIE Yan(2)
    (1) Tobacco Research Institute, Hunan Agricultural University, Changsha 410128, P.R. China; (2) Qujing Branch of Yunnan Province Tobacco Company, Qujing 655000, Yunnan, P.R. China
    In order to investigate the spatial distribution of main nutrients in tobacco planting soil, 3650 soil samples were collected with GPS technique in Qujing. The overall characteristics and spatial variation of main nutrients in the soil were analyzed with ...
  8. Tobacco Science & Technology, 2012, 2, p. 75-79., ISSN.1002-0861

    Occurrence regularity of Heliothis assulta Guenée in Hunan and forecast thereof

    LONG Xiao(1); ZENG Aiping(1,2); ZHOU Zhicheng(2); CHEN Yongnian(1); HU Risheng(2); LONG Jianzhong(3); LI Xiaoyi(4); WU Chune(5)
    (1) College of Bio-Safety Science and Technology, Hunan Agricultural University, Changsha 410128, P.R. China; (2) China Tobacco South Experimental Station, Changsha 410128, P.R. China; (3) Ningyuan County Tobacco Company, Ningyuan 425600, Hunan, P.R. China; (4) Chenzhou Tobacco Company, Chenzhou 423000, Hunan, P.R. China; (5) Jianghua County Tobacco Company, Jianghua 425500, Hunan, P.R. China
    In order to effectively control Heliothis assulta Guenée, its regularity of occurrence and forecasting were studied on the basis of years’ records collected from each monitoring point in tobacco planting areas in Hunan. The results showed that the actual ...
  9. Tobacco Science & Technology, 2012, 6, p. 76-79, ISSN.1002-0861

    Microstructure differentiation of middle leaves among flue-cured tobacco cultivars

    HUANG Yong(1); HE Xiaoli(2); ZHANG Wei(1); ZHOU Jiheng(*1)
    (1) College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, P.R. China; (2) Experimental Center, Hunan Agricultural University, Changsha 410128, P.R. China
    For investigating the differences in leaf microstructure among flue-cured tobacco cultivars, the microstructures of mature middle leaves of cv. K326, Honghuadajinyuan (HD), Yunyan87 (Y87), Yunyan85 (Y85), G80, Zhongyan14 (Z14) and Xiangyan1 (X1) cultured ...