Life Sciences and Chemistry

BSE in sheep: first estimates of human death toll

The first attempt to estimate the human health risk from possible BSE infection of the British sheep flock is published today by researchers from Imperial College, London.

They show that while the present risk of Creutzfeldt-Jakob disease (vCJD) from eating sheep could be greater than that from cattle, the overall historical risk from sheep is much less than that from cattle.

The research, which is reported in the jo

A virus that causes a fatal brain disease in horses and sheep may be linked to certain mental disorders in man, medical experts heard today (Wednesday 09 January 2002) during a joint meeting of the European Societies of Clinical and Veterinary Virology and the Society for General Microbiology at the Royal College of Physicians, London.

“Recent investigations have again stimulated highly controversial discussions as to whether Borna disease virus can infect humans and lead to psychiatric diso

The discovery of small spikes lining the mouths of primitive fossil fish reveal surprising new details about how early animals fed. New research published today in a Royal Society paper sheds light on how teeth evolved.

Primitive fish did not have jaws or fins but were covered in rigid bony scales and resembled small armour-plated submarines. Dr Mark Purnell, a palaeontologist at the University of Leicester, has discovered that heterostracans, one of the most important groups of these early

The discovery by French scientists that cotton plants produce a kind of ‘plant aspirin’ in response to bacterial infection could lead to new ways of fighting crop diseases.

Researchers led by the French Institute of Research for Development (IRD) found that salicylic acid — which has a chemical structure very similar to that of aspirin — and jasmonate acid are both released by cotton plants in response to infection by the bacterium Xanthomonas .

The two plant hormones play

Meteorites could have sweetened the earliest life.

Sugar from space may have nourished the first life on Earth. Two meteorites contain a range of polyols, organic substances closely related to sugars such as glucose 1 .

George Cooper of NASA’s Ames Research Center in California and co-workers have found these compounds in the Murchison meteorite, which fell over the Australian town Murchison in 1969, and in the Murray meteorite, that fell to Kentucky in 1950.

The structure of one of the basic members of the cell-membrane water-channel family, a protein called aquaporin 1 (AQP1), has been determined to a resolution of 2.2 angstroms (22 billionths of a meter).

The structure reveals the elegantly simple means by which AQP1 can transport water through the cell membrane at a high rate while effectively blocking everything else, even individual protons, the nuclei of hydrogen atoms.

Biophysicist Bing Jap led a team from Lawrence Berkeley Nat