| COMMENTS |
"This is clearly an advance in noncarbon nanotube technology." "The microscopy and analysis have been done superbly." Author explains that the title study "stands out from other reports on the subject" in that the BN nanotubes were grown in a pristine high-vacuum environment and then imaged without exposing the specimens to air. By confining the samples to a clean atmosphere with less than one-billionth the number of molecules typically present in air. Title work's authors avoid the question that has bedeviled earlier studies: Did reactions with water, oxygen, or other contaminants introduce structural artifacts
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