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Home > All Images > 2002 > July > 5 Jul 2002

Images Dated 5th July 2002

Choose from 22 pictures in our Images Dated 5th July 2002 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

SEM of vascular tissue of tobacco leaf B745/0312 Featured 5 Jul 2002 Image

SEM of vascular tissue of tobacco leaf B745/0312

Tobacco. Coloured scanning electron micrograph (SEM) of vascular leaf fragments in cigarette tobacco. The walls of the xylem vessels seen here are strengthened with cellulose and lignin in annular and reticulate thickenings (brown). These vessels are responsible for the upward translocation of water in the living plant. The tobacco plant, Nicotiana tabacum, is cultivated in warm dry climates. The leaves are cured and matured in storage for two to three years before being used in cigarettes, cigars and snuff. The leaves also yield the alkaloid nicotine, one of the most powerful poisons known, and addictive to humans. Magnification: x520 at 5x7cm size. x740 at 8x6ins, x395 at 10x7cm master size