As a result, plants require many hundreds of grams of water to produce one gram of plant biomass, largely carbohydrate.

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One gram of DNA ought to be able to hold about two petabytes of data, he added - the equivalent of about three million CDs.

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The Federal Communications Commission limits cell phone radio frequency energy emissions, called the specific absorption rate (SAR), at 1.6 watts per kilogram, as measured over one gram of tissue.

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One gram of mercury can poison a 2-acre pond.

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Brief exposure to high levels of PCBs and dioxins may cause skin lesions and affect the liver (the tolerated daily intake for dioxin is about 1 picogram - one trillionth of a gram - per kg body weight).

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The sensor's imaging chip picks up the dark string immediately, even if only 1 femtogram (one-quadrillionth of a gram) of TNT is stuck to it.

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But no F1 car constructor would build a vehicle one gram more than the minimum for fear of making it uncompetitive.

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The manufacturer then dilutes it to 200C, which in homeopath-speak means that 1 gram of extract is diluted to one part in 10400.

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As Japan Airlines (JAL) says, it is looking at its operations from every angle to find ways of reducing weight from aircraft, even if it is just by one gram.

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