Only the tubes, and not the rooms they are in, need to be kept ultra-clean.

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Most are produced in huge, ultra-clean factories using batch processes similar to those for making silicon chips.

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He waived the requirement that buildings and homes in New York City use only ultra-clean-burning diesel, though December 7.

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The ultra-clean, synthetic diesel fuel is made from animal fats, such as beef tallow, pork lard and chicken fat.

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In contrast, airports in Dubai, Hong Kong and Singapore offer clean, ultra-modern facilities with often impressive design.

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We are likely to see the reverse innovation phenomenon in a wide range of industries such as ultra-low-cost transportation, renewable energy, clean water, micro finance, affordable health, low-cost housing, and many others.

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