Galileo Galilei: Science vs. faith
[first paragraph of article] Galileo Galilei (1564–1642), professor of mathematics at the University of Padua from 1592 to 1610, was a pillar in the history of our University and a symbol of freedom for research and teaching, well stated in the university motto ‘‘Universa Universis Patavina Libertas’’ (Total freedom in Padua, open to all the world). He invented the experimental method, based on evidence and calculation (‘‘science is measure’’) and was able, by using the telescope, to confirm the Copernican heliocentric theory, a challenge to the Bible. Bertrand Russell (1872–1970), in his book ‘‘The Problems of Philosophy’’ stated: ‘‘Almost everything that distinguishes modern world from earlier centuries is attributable to science, which achieved the most spectacular triumphs in the seventeenth century. Together with Harvey, Newton and Keplero, Galileo was a protagonist of this scientific revolution in the late Renaissance’’.
Origin and development of modern medicine at the University of Padua and the role of the “Serenissima” Republic of Venice
[first paragraph of article] The University of Padua Medical School played a fundamental role in the history of medicine. Padua is a very old town, probably one of the oldest in North Italy. Traditional legend tells that the Trojan prince Antenore founded Padua in 1183 BC. At the beginning of the Roman Empire, Padua was an important town, both for its strategic position as an ultimate defence point against barbarian populations of North Europe and for its famous horse breeding, which made it the main supplier of horses to the Roman army. In the late Middle Ages, even before the rule of Venice, Padua was a prosperous city state adhering to the values of tolerance, civilization and democracy. During that era, Padua was particularly famous for its school of civil and religious law, which was the cornerstone for the upcoming university.
The crystal structure of stilpnomelane. Part II. The full cell
Summary The structural formula of stilpnomelane averaged from 37 representative literature analyses and based on the determined structure is (Ca,Na,K)4(Ti0·1Al2·3Fe35·5Mn0·8Mg9·3)[Si63Al9](O,OH)216·nH2O. Ferrostilpnomelanes have up to 12 R 3+ cations in the octahedral sheet, ferristilpnomelanes commonly have between 24 and 30 R 3+ cations, rarely up to 37. The two groups can be distinguished by accurate X-ray powder diffraction, ferrostilpnomelanes having d 001 less and a greater than have ferristilpnomelanes. The unit cell is triclinic, a = b∼21·8 Å, γ = 120°, d 001∼12·2 Å, P . Hexagonal groups or ‘islands’ of 24 silicon-oxygen tetrahedra co-ordinate to the octahedral sheet, the centres of the ‘islands’ are displaced by 5a/12, 8b/12 on either side of the octahedral sheet as a result of warping of this sheet to permit articulation with the smaller tetrahedral sheet. The 24-tetrahedra ‘islands’ are linked laterally by 6-member rings of inverted tetrahedra, which in turn link at their apices to like rings connecting the next sheet of ‘islands’. Thus a single tetrahedral layer is 4 tetrahedra thick and has symmetry 6/m. The 6-member rings of tetrahedra act as hinges permitting up to 0·5 Å extension or contraction of the tetrahedral sheet to accommodate variations in the octahedral sheet dimensions with varying R 2+/R 3+ ratio.