• Journal of the Korean Society of Tobacco Science
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• v.9 no.1
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• pp.65-71
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• 1987

In order to obtain the most suitable ageing term of Flue-cured tobacco in natural condition, leaf tobacco packed in hogshead and stored in leaf tobacco warehouse for 4 years, and the changes of major physico-chemical components were examined at three months intervals, As storage time goes by, except the moisture content, general chemical components of leaf tobacco were decreased until about 9-15 months of storage. Among them, decrement of total sugar was the most significant. After 18 months storage, the chlorophyll was decreased by 50% of initial stage. The content of essential oils, solanone, damascenone, megastigmatrienone I, II, III, IV, were approached the maximum between 12 months and 15 months of storage and then lessened by degrees.

• Journal of the Korean Society of Tobacco Science
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• v.18 no.1
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• pp.60-65
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• 1996

Chemicals including antibiotics and bactericides were screened for suppression of streptomycin-resistant Erwinia cmutouom subsp. cmutovom (Ecc) strains in laboratory and field conditions. Oxytetracycline, ethoquinolac and dichlorophen suppressed the growth of streptomycin-resistant Ecc strains in vitro. Fractional inhibitory concentration (FIC) indices of oxytetracycline and ethoquinolac mixed with streptomycin against the Ecc strains were equal to and less than one, respectively. Consequently the efficacy of those chemicals in mixture with sorptomycin were non-antagonistic But that of dichlorophen mixed with streptomycin was more than one, therefore the efficacy of the mixture was antagonistic. Spray of oxyteoucycline, ethoquinolac and agrimycin-100 on the topped burley tobacco plants was efficacious in reducing tobacco hollow stalk at the same level of sorptomycin treatment in three-year field trials, which suggests that those are promising chemicals to be alternative to streptomycin for control of tobacco hollow stalk.

• Journal of the Korean Society of Tobacco Science
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• v.16 no.2
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• pp.97-101
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• 1994

Tobacco stalks were cut and removed from the field after harvest, and urea was treated by placing it on the cutting portions of the remaining tobacco stumps. Relative virus infectivity of the root residue(compared to the fresh root residue infected with TMV) was reduced to 14.6% in December, 1993(before overwintering) and to 8.5% in March, 1994 just before transplanting, indicating that the TMV infectivity decreased remarkably, but was preserved still in the root residue in the field soil. There was no significant difference in infectivity of remaining root tissue between the treated and untreated root residue. However, as roots with urea treatment had been extensively decayed, only about one - fifth of the initial root volume remained after overwintering. TMV occurred less (by one - third) in the urea treatment than in the control, suggesting that urea treatment effectively provented tobacco from TMV infection by reducing the inoculum potential.

• Proceedings of the Korean Environmental Health Society Conference
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• 2003.06a
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• pp.166-170
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• 2003

Smoking of tobacco cigarettes is associated with a rise in blood pressure together with an increase in heart beat rate. This study examined the acute effect of tobacco and non-tobacco cigarette smoking on the blood pressure and heart beat rate by randomized crossover study involved 39 volunteers. In the results, systolic blood pressure and heart beat rate changes after smoking were significantly different in non-tobacco cigarette smoking group from in tobacco cigarette smoking group.

• Journal of the Korean Society of Tobacco Science
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• v.14 no.2
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• pp.144-150
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• 1992

This study was carried out to investigate the effect of yield and quality on the harvesting time and methods of stalk cutting in Burley Tobacco.3 harvesting methods and 4 harvesting times of stalk cutting were compared to priming. The yield and quality were high when cut the stalk after second priming in stalk curing. It was also desirable that cut the stalk after second priming in stalk curing. It was also desirable that cut the stalk on 30 days after topping for standard fertilization(N-P2O5-K2O= 17.5-17.5-35.0kg/10a) plot, and 30-35 days after topping for 30% increased fertilization.

• Journal of the Korean Society of Tobacco Science
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• v.4 no.1
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• pp.61-66
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• 1982

Essential oil components were isolated from Korean aromatic tobaccos by using a simultaneous distillation and extraction apparatus. The essential oils were analyzed by GC/M S and date system. Forty-two volatile components were identified on the basis of their mass spectra. Determination of contents of essential oil components from Hyangcho and Sohyang was achieved by pseudo-multiple ion selection (Ml S) technique. Varietal differences were detected from the quantitative comparison of the MIS data.

• Journal of the Korean Society of Tobacco Science
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• v.17 no.2
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• pp.120-125
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• 1995

Varietal difference in the occurrence of grey leaves in upland diverted from paddy field were investigated with several flue-cured tobacco varieties in Korea. Grey leaves caused by Fe, Mn and Cl toxicity were occurred in all varieties used in this experiment. The variety, NC82 and KF113, however, were more sensitive than other varieties to the toxicity. It's revealed that grey leaves had little effects on the contents of total sugar, nicotine and total nitrogen. NC82 and KF113 were increased in the ratio of occurrences in the paddy soils which had a tendency to concrete with the passage of days after transplanting. NC82 showed high occurrences of grey leaves in each of variety used and it was estimated that this variety had a traits of easy occurrences of grey leaves, and it might be presumed that there would be a close connection between the ratio of occurrence and amounts of absorbed causal materials accumulated in plants and tobacco varieties on the occurrence of grey leaf tobacco.

• Korean Journal Plant Pathology
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• v.11 no.1
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• pp.80-86
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• 1995

The cDNA of CMV-As satellite RNA was introduced into tobacco plants (Nicotiana tabacum cv. Samsun NN) using a binary Ti plasmid vector system of Agrobacterium tumefaciens. The cDNA of satellite RNA introduced into tobacco plants was detected by polymerase chain reaction (PCR) and molecular hybridization analyses. Symptom development was distinctly suppressed in the transgenic tobacco plants when inoculated with CMV-Co. CMV concentration in the transgenic tobacco plants was decreased to 1/40 of non-transgenic tobacco plants. The kanamycin resistance gene of the transgenic tobacco plants was also detected in the progeny.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2000.10a
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• pp.84-95
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• 2000

Panax ginseng and the herbal medicinal mixtures containing ginseng have been widely used as a traditional medicinal prescriptions. In order to develop more efficient and protective prescriptions on seizures and subsequent memory deterioration, we investigated the biochemical and ethopharmacological effects of ginsenosides and fractions from the natural medicinal plant products related to control convulsions. In this studies we show results improving spatial teaming and memory deficits induced by kainic acid, a potent neurotoxic and neuroexcitatory analogue of the amino acid neurotransmitter glutamate.

• Journal of the Korean Society of Tobacco Science
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• v.12 no.2
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• pp.77-83
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• 1990

This study was conducted to develop the method of hydrocarbon analysis and investigate hydrocarbon contents in flue-cured and burley tobacco leaves harvested in Korea and U.S.A. Tobacco leaf was extract with hexane in soxhlet apparatus. Hydrocarbon was fractionated from hexane extract by silica gel column chromatography, and then separated and indentified by GC, GC/MS using SE-54 fused silica capillary column. The developed method was feasible to analyze neophytadiene, normal and branched hydrocarbons from Clo to Cn. The result of recovery test was decade 99%, eicosane 100%, triacontane 102%. The major hydrocarbon of tobacco leaves were neophytadiene, nC3l, iC31, nC33, aC33, aC32, aC30 and nC29. The amount of total hydrocarbon in burley and flue-cured tobacco leaves harvested in U.S.A. and Korea were 4591, 2931, 2929 and 3015$\mu\textrm{g}$/g, respectively.