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Representations of the crystal structures of the three polymorphs of titanium dioxide, TiO2: rutile, brookite, and anatase. The octahedral units represent titanium atoms surrounded by six oxygen atoms. [From J. E. S. Haggerty et al., Sci. Rep.,…

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from article Radian measure

Diagrams showing radian measurement. Symbols are explained in the text.

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from article Interface of phases

Contact angle θ at interface of three phases.

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from article Cellulose

Microscopic view of cotton fibers, which contain 98% cellulose. (Credit: Martin Kreutz/agefotostock)

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from article Cellulose

Positioning of β-d-glucopyranosyl units in cellulose structure.

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from article Cellulose

Cellulose is the principal structural component of plants. In particular, cellulose in the plant cell wall is found mainly in the form of threadlike fibers, composed of smaller fibrils (microfibrils). (Copyright © McGraw-Hill Education)

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from article Oxygen