Mathematical models are used to determine if infection wave fronts could occur by traveling geographically in a loop around a region or continent. These infectionwave fronts arise by Hopf bifurcation for some spatial models for infectious disease transmission with distributed-contacts. Periodic traveling waves are shown to exist for the spatial analog of the SIRS endemic model, in which the tem...

F rom the prefabricated wooden huts of Antarctic explorers in the early 20th century to the enduring limestone ruins of the Mayan city Ek’ Balam (Black Jaguar) built more than 1,200 years ago (Fig. 1), conservators, archaeologists, and other specialists are striving to understand and combat the physical, chemical, and biological processes responsible for the deterioration of these historic stru...

This article argues that the binary between quantitative and critical geography is pseudo rather than real. The duality arose, the article suggests, because of the peculiar postwar intellectual history of human geography in which the critical approach followed the quantitative one. Accordingly, for internal sociological reasons, it was necessary for the critical approach to excise everything th...

First of a two-part series. This year, the Organization for Economic Cooperation and Development reported that its 30 member countries, most from the developed world, spent record amounts on health care in 2001. The United States tops this list, spending $4,900 per capita in public and private dollars combined. As developed countries spend more and more in both public and private funds for heal...

The discovery that lithium treatment at blastula stages can induce axis formation suggested that it might act by respecifying the cytoplasmic rearrangement-generated dorsoventral pattern, so that ventral cells behave like their dorsal counterparts. We have studied the effects of Li treatment on the spatial layout of the cell-group movements of gastrulation to see whether this is the case. We fi...

Considerable focus has been devoted to how much antipsychotic is appropriate for optimal clinical response, although how often antipsychotics need to be administered is also less than clear. Clinicians are aware of the increased risk of relapse related to antipsychotic nonadherence/discontinuation, and current practice dictates continuous antipsychotic exposure with the goal of achieving steady...

The chapters in this issue originated in the Comparative and International Education seminar given each year at the Pennsylvania State University and re#ect nearly two years of ongoing work analyzing minority educational policy from a cross-national perspective. There are three goals of this special issue. The "rst is to provide readers with case studies of the impact of national educational po...

Military conscription has been around since ancient times, and it remains remarkably popular today. For example, Jehn and Selden (2002) report that while eight European nations have recently eliminated or are phasing out conscription programs, another 20 nations plan on retaining conscription into the foreseeable future. Mulligan and Schlieffer (2004), meanwhile, report that 95 of the 164 count...