Limitation Act, 1939

Leon Richard Kass (1939- )

A PhD and medical doctor turned ethicist, Leon Kass calls himself an unlicensed humanist. Throughout his unique career he has sought to impact others and engage important cultural issues. This he has accomplished over the course of many years by studying biochemistry, teaching humanities, writing articles and books on ethics, and serving as chair of the President?s Council on Bioethics. Kass ha...

Karl Oskar Illmensee (1939?)

Karl Oskar Illmensee studied the cloning [2] and reproduction of fruit flies, mice, and humans [3] in the US and Europe during the twentieth and twenty-first centuries. Illmensee used nuclear transfer techniques (cloning [2]) to create early mouse [4] embryos from adult mouse [4] cells, a technique biologists used in later decades to help explain how embryonic cells function during development....

Walter Gehring (1939–2014)

and time. However, it’s not all about machines taking over from field workers. Technology can also help to get more people involved with field work in ecology and conservation. The Earthwatch Institute (www.earthwatch.org), for instance, supports a project called My Tree Tracker, based on a smartphone app encouraging volunteers to keep an eye on the growth and health of the trees in their citie...

Sigmund Freud (1856-1939)

Dev102012 1927..1939

The Xenopusmid-blastula transition (MBT) marks the onset of largescale zygotic transcription, as well as an increase in cell cycle length and a loss of synchronous cell divisions. Little is known about what triggers the activation of transcription or how newly expressed genes interact with each other. Here, we use high-resolution expression profiling to identify three waves of gene activity: a ...