A retrospective analysis was performed on forty cases of spinal cord meningiomas, operated on at Dr. Shariati Hospital from 1976 to 1990. Age and sex distribution, clinical presentation and tumor location were comparable to those reported by others. In males the tumors were distributed evenly in cervical and dorsal areas and were often anterior to the cord. This finding makes a different s...

Climate modelling is now a mature discipline approaching its fortieth birthday. The need for valid climate forecasts has been underlined by the recognition that human activities are now modifying the climate. The complex nature of the climate system has resulted in the development of a surprisingly large array of modelling tools. Some are relatively simple, such as the earth systems and energy ...

It has been 40 years since Spiegelman and co-workers demonstrated how RNA molecules can be evolved in the test tube. This result established Darwinian evolution as a chemical process and paved the way for the many directed evolution experiments that followed. Chemists can benefit from reflecting on Spiegelman's studies and the subsequent advances, which have taken the field to the brink of the ...

In 2007, we marked the 40th anniversary of the birth of invasive clinical electrophysiology. Of course, before 1967, cardiac arrhythmias were documented electrocardiographically, and their possible mechanisms were analyzed ingeniously and explained beautifully by giants such as Katz and Pick,1 Scherf and Schott,2 and Bellet.3 In the 1940s and 1950s, Hecht,4 Latour and Puech,5 and Giraud et al6 ...

Gödel's legacy is still very much in evidence. We will not attempt to properly discuss the full impact of his work and all of the ongoing important research programs that it suggests. This would require a book length manuscript. Indeed, there are several books discussing the Gödel legacy from many points of view, including, for example, [Wa87], [Wa96], [Da05], and the historically comprehensive...

Information systems design was the theme for a research group at Stockholm University under the leadership of Professor Janis Bubenko, Jr. The research group was called Computer Aided Design of Information Systems (CADIS). The CADIS group developed modeling methods and, at the same time, computer support for the modeling of information systems. The methods were stepwise defined based on early p...

The reader will find in this article a collection of problems, questions and exercises related to the singularities of algebraic and analytic varieties. Many of them are inspired by the work and mathematical conception of Hironaka: they are concrete, involve basic ideas and techniques from geometry and algebra, and they can immediately be attacked from scratch. Some problems rely on or use resu...

In 1975, our team encountered several cases of severe inflammatory eye disease presenting as a white pupil in a red eye with rapid loss of vision. The eyes became soft within a few days with shallow anterior chamber which we called "Malignant Hypotension" in view of the latter's sinister significance. Unilaterally, little or no pain, predominantly affecting children and difficulty in dilating t...