Even within the same plant,leaves from different stalk positionsshow a definite pattern of chemical distribution. For example,total nitrogen and nicotine contents increase with higher stalk position,but reducing sugars are higher in the middle position as...[继续阅读]

    One of the most important factors in the production of high qualitycured leaf is the harvest of ripe tobacco. No amount of skill in flue - curing can make up for the failure to harvest tobacco at the proper stage ofleaf maturity. The terms ripe and ripene...[继续阅读]

    All variables in tobacco plant,leaf,and smoke are interrelated.No step of tobacco operation from seed germination to smoke delivery canbe isolated,because they relate to the usability of final products. “Usability” is considered as consumer acceptability ...[继续阅读]

    The main reasons for incorporating reconstituted tobacco in the blendare economic. The cost of tobacco is rising as a result of general inflationary pressure and inability of growers to keep up with demand,and sothe cigarette maker must find ways to get m...[继续阅读]

    Freshly cured tobacco leaf is unfit for use because of its pungent andirritating smoke. By the process of fermentation and aging,the leaf delivers mild and aromatic smoke. Aging is generally applied to cigarettetobacco,i. e.,a mild state of fermentation,u...[继续阅读]

    The terms “flavor” and “aroma” of tobacco are used rather loosely. Generally,flavor refers to the blend of taste and smell sensationsevoked by a substance in the mouth; aroma refers to the distinctivepleasing odor or smell derived from either leaf tobacco...[继续阅读]

    Biotechnology,of which recombinant DNA technology is an important sub-discipline,has a long tradition in the production of food and flavors. Around 3500 B. C.,humans first started to use microbes for theproduction of wine,beer,bread and many other foods t...[继续阅读]

    a. ChlorophyllThe plastid pigments in relation to the physiological age of the leafaccording to stalk position was examined. Concentration of chlorophyllwas approximately the same at all stalk positions in a virescent line. Influe-cured tobacco,chlorophyl...[继续阅读]

    Parasexual hybridization is a process to develop hybrid plants by fusion of protoplasts from different species or related plants differing in theircytoplasms. In a broad sense,it also may include inserting organellessuch as nuclei,plastids,mitochondria,an...[继续阅读]

    The metabolic activities in tobacco leaves during growth,maturationand senescence are continuous processes and shift gradually from onestage to the next. Intensive growth ceases in coincidence with decliningnitrogen uptake and reduction and the onset of s...[继续阅读]