How are vascular tissues arranged in dicot stems?
xylem is near leaves, phloem is near roots.
xylem forms an outer ring around phloem.
xylem and phloem are bundled randomly.
phloem forms an outer ring around xylem.

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

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