Water bear (Macrobiotus sapiens) in moss. Color enhanced scanning
electron micrograph (SEM) of a water bear in its active state. Water
bears (or tardigrades) are tiny invertebrates that live in aquatic and
semi-aquatic habitats such as lichen and damp moss. They require water
to obtain oxygen by gas exchange. In dry conditions, they can enter a
cryptobiotic state of desiccation, known as a tun, to survive. In this
state, water bears can survive for up to a decade. This species was
found in moss samples from Croatia. It feeds on plant and animal cells.
Water bears are found throughout the world, including regions of extreme
temperature, such as hot springs, and extreme pressure, such as deep
underwater. They can also survive high levels of radiation and the
vacuum of space. Magnification: x250 when printed 10cm wide.
John Gurdon. Portrait of British geneticist John Gurdon (born
1933), Professor of Cell Biology at Cambridge University and Chairman of
the Wellcome CRC Institute for Cancer and Developmental Biology in
Cambridge, UK. Educated at Eton and Christ Church, Oxford, Gurdon was
elected a Fellow of the Royal Society of London in 1971. His research
concerns the way genes control the development of specialized cells from
rapidly dividing cells in vertebrate embryos. Because cancers contain
rapidly dividing cells that have lost their specialized functions, this
work is of major importance in the fight against cancer.