A trip to the seaside is a real gas

As a child on a trip to the seaside, how often were you told to breathe deeply to get the full effects of the healthy air? The evocative smell - perhaps a mixture of salt, sand and maybe fried food - has often been hailed for its healing qualities.

As a child on a trip to the seaside, how often were you told to breathe deeply to get the full effects of the healthy air?

The evocative smell - perhaps a mixture of salt, sand and maybe fried food - has often been hailed for its healing qualities.

And now scientists from UEA have discovered exactly what makes the seaside smell like the seaside - and bottled it.

The age-old mystery was unlocked thanks to some novel bacteria plucked from the north Norfolk coast.

Prof Andrew Johnston and his team isolated a microbe from the mud at Stiffkey saltmarsh to identify and extract the single gene responsible for the emission of the strong-smelling gas, dimethyl sulphide (DMS).

"On bracing childhood visits to the seaside we were always told to 'breathe in that ozone, it's good for you'," said Prof Johnston.

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"But we were misled, twice over. Firstly because that distinctive smell is not ozone, it is dimethyl sulphide. And secondly, because inhaling it is not necessarily good for you."

DMS is a little known, but important, gas.

Across the world's oceans, seas and coasts, tens of millions of tonnes of it are released by microbes that live near plankton and marine plants, including seaweeds and some saltmarsh plants.

The gas plays an important role in the formation of cloud cover over the oceans, with major effects on climate.

Indeed, the phenomenon was used by scientist James Lovelock as a plank to underpin his "Gaia hypothesis" - an ecological theory which suggested that the planet Earth is a self-regulating living being.

DMS is also a remarkably effective food marker for ocean-going birds such as shearwaters and petrels.

It acts as a homing scent - like Brussels sprouts at the Christmas dinner table - and the birds sniff out their plankton food in the lonely oceans at astonishingly low concentrations.

Scientists have known about DMS for many years but the genes responsible for its production have never before been identified.

The new findings are published in the journal Science today.

"By isolating a single gene from a bacterium collected from the mud of Stiffkey marshes, we deduced that the mechanisms involved in DMS production differ markedly from those that had been predicted," said Prof Johnston.

"And we discovered that other, wholly unexpected bacteria could also make that seaside smell."

The discovery adds to the diverse list of Stiffkey's claims to fame.

The small coastal village is renowned for its "Stewkey Blue" cockles and was also the home of Henry Williamson, author of Tarka the Otter.

A more controversial figure from Stiffkey's past was its rector, the Rev Harold Davidson, who was defrocked in 1932 after allegedly "cavorting with" London prostitutes.

He later joined a circus and died after being mauled to death by a lion in Skegness.

The UEA scientists are hoping to avoid such a fate, said Prof Johnston.

They have been given a grant to research further the mechanisms that underpin DMS production, which have a significant impact on many aspects of the oceans and the atmosphere, but which have only recently attracted the attention of geneticists and molecular biologists.

Look out for the EDP Sunday supplement inside this Saturday's Eastern Daily Press where we pitch the smell of the seaside against the scent of lavender, sugar beet and even country muck as we begin our search for the Eau de Norfolk in the latest of our suggestions for the virtual reality Museum of Norfolk.