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acrylic prints nature acrylic prints tobacco acrylic prints nicotiana tabacum acrylic prints pore acrylic prints plant acrylic prints leaf acrylic prints botany acrylic prints biology acrylic prints sem acrylic prints coloured acrylic prints scanning electron microscope acrylic prints green acrylic prints two acrylic prints pair acrylic prints duo acrylic prints

photographs nature photos tobacco photos nicotiana tabacum photos pore photos plant photos leaf photos botany photos biology photos sem photos coloured photos scanning electron microscope photos green photos two photos pair photos duo photos

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Open stomata. Coloured scanning electron micrograph (SEM) of open stomata on the surface of a tobacco leaf (Nicotiana tabacum). Stomata are pores found on the leaf surface that regulate the exchange of gases between the leaf's interior and the atmosphere. Stomatal closure is a natural response to darkness or drought as a means of conserving water. Each pore is controlled by two guard cells (red); the pores open when they are full of water and close when they lose water. Magnification: x720 at 10 centimetres wide.

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