This paper discusses plane symmetry groups, also known as planar crystallographic groups or wallpaper groups. The seventeen unique plane symmetry groups describe the symmetries found in two-dimensional patterns such as those found on weaving patterns, the work of the artist M.C. Escher, and of course wallpaper. We shall discuss the fundamental components and properties of plane symmetry groups.

How well do U.S. students read? In this article, Sean Reardon, Rachel Valentino, and Kenneth Shores rely on studies using data from national and international literacy assessments to answer this question. In part, the answer depends on the specific literacy skills assessed. The authors show that almost all U.S. students can "read" by third grade, if reading is defined as proficiency in basic pr...

This report by George G. Somjen, for the Commission on Teaching Physiology, International Union of Physiological Sciences, presents a summary of answers received to a questionnaire concerning the state of Physiology Teaching. One hundred seventeen responses have been received from fifty countries. The results have been tabulated and contain information about the teaching methods and resources a...

OBJECTIVE To investigate the extent to which GPs in The Netherlands participate in disease management and how personal opinions, impeding and promoting incentives as well as physician characteristics influence their attitude towards disease management. METHODS The attitude-model of Fishbein and Ajzen was used to describe the attitude of GPs towards disease management and main influencing fact...

BACKGROUND During the past three decades, Oman has made significant progress in controlling TB within it's borders. However, the national TB control program elimination target has yet to be reached. This study aims to explore the perceived roles played by the immigrant population and the private health sector in relation to TB control in Oman. METHODS We conducted seventeen interviews with di...

requiring the ratepayers to maintain lunatics of the middle and lower classes." The last of these two propositions is easily dealt with. If the honourable member had only taken the trouble to get up any information at all before he addressed the House on so important a subject, he would have found that at all country and borough asylums there is a system of payment enforced upon the relatives o...