SEM xylem tubes showing cross section of wood cells from southern white cedar (Chamaecyparis thyoides). Cells made in the spring of the year (upper portion) are somewhat larger in their cross section, while Cells made in the summer (lower portion) have a smaller cross section and a thicker wall. Magnification 1000x.

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TOP22218586

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達志影像

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RM

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須由TPG 完整授權

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