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Home > All Images > 1991 > October > 15 Oct 1991

Images Dated 15th October 1991

Choose from 11 pictures in our Images Dated 15th October 1991 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Section through leaf of Zinnia Featured 15 Oct 1991 Image

Section through leaf of Zinnia

False-colour scanning electron micrograph of the under surface of a leaf, Zinnia elegans, showing a part of the epidermis removed to reveal the spongy mesophyll layer (left) under the surface. The epidermis (right) consistis of large, irregular cells with waterproofing constituents in the wall. The jigsaw effect corresponds to the epidermal cells. The epidermis shows stomatal pores, which regulate the exchange of air between the atmosphere and the leaf's interior. Mesophyll cells are large and attached at limited points only, creating airspaces through which the air entering via the pores circulates freely through the leaf. Magnification: x150 at 6x4.5cm size