Joseph Needham, C.H. 9 December 1900 — 24 March 1995

Joseph Needham (1900-1995)

Joseph Needham [4] was an embryologist and biochemist who is most noted in science for his studies on induction [5] in developing embryos. Needham worked with Conrad Hal Waddington [6] to attempt to identify the compound responsible for the organizer?s activity. Although he was not successful in discovering the chemical, he and Waddington learned much about the organizer [7]. Needham was a meti...

A History of Embryology (1959), by Joseph Needham

In 1931 embryologist and historian Joseph Needham [3] published a well-received threevolume treatise titled Chemical Embryology [4]. The first four chapters from this work were delivered as lectures on Speculation, Observation, and Experiment [5], as Illustrated by the History of Embryology at the University of London. The same lectures were later released as a book published in 1934 titled A H...

Friday 24 March 2017

For the last 40 years the use of Computed Tomography “CT” in Medical Imaging has been increasing dramatically. Yearly CT scans done in US have risen from less than 3 million in 1980 to currently being more than 80 million a year. Last year in Australia, Medicare has paid for 3 million CT examinations that does not include Hospital inpatients, private insurance and workers compensation and Motor...

/ 9503022 March , 1995 PSEUDO - DUALITY

Proper symmetries act on fields while pseudo-symmetries act on both fields and coupling constants. We identify the pseudo-duality groups that act as symmetries of the equations of motion of general systems of scalar and vector fields and apply our results to N = 2, 4 and 8 supergravity theories. We present evidence that the pseudo-duality group for both the heterotic and type II strings toroida...

PLS Newsletter, v5n6, March 1995