The Cultivation of Endamoeba histolytica and the in-vitro Chemotherapeutic Testing of Amebacides

Endamoeba histolytica is the casual organism of the disease, amebiasis. Global distribution of high incidence makes this protozoan infection an enormous public health and economic problem. Cultural behavior and the ensuing search for effective chemotherapeutic agents has stimulated widespread interest in the parasitology and associated bacteriology of this organism

High Grading Standards Improve Student Performance

Allgemeinbildende Schule, Schulpolitik, Qualifikation, Vereinigte Staaten, General schooling, School policy, Occupational qualification, United States

International Interest-Rate and Price-Level Linkages Under Flexible Exchange Rates: A Review of Recent Evidence

In an open economy, the scope for activist stabilization policy depends on the nature of the lincages between domestic and international markets for goods and assets. Tgo

Aggregate agricultural supply response in developing countries : a survey of selected issues

The authors review several studies of the aggregate agricultural supply response. Using both economic and econometric reasons, they argue that time series estimation typically generates a downward-biased estimate of the response to a credible reform. Even though time series estimates can provide an accurate picture of past behavoiral relations, they do not provide an adequate basis for forecasting the impact of policy reform. This is especially true in developing countries, where policy reforms involve large changes and have included agricultural price reform, industrial trade liberalization, financial sector reform, and macroeconomic stabilization. Under those circumstances, parameters values obtained under the former policy regime have little relevance in the new regime. The authors also argue that investment in public goods should be viewed as complementary to, not competitive with, price policy. They claim that to select the policy with the biggest impact on output makes no sense. They provide what they consider to be better criteria for choosing the best from alternative policies.Environmental Economics&Policies,Payment Systems&Infrastructure,Economic Theory&Research,Markets and Market Access,Labor Policies,Economic Theory&Research,Environmental Economics&Policies,Access to Markets,Markets and Market Access,Inequality

Defining adaptation in a generic multi layer model : CAM: the GRAPPLE conceptual adaptation model

Authoring of Adaptive Hypermedia is a difficult and time consuming task. Reference models like LAOS and AHAM separate adaptation and content in different layers. Systems like AHA! offer graphical tools based on these models to allow authors to define adaptation without knowing any adaptation language. The adaptation that can be defined using such tools is still limited. Authoring systems like MOT are more flexible, but usability of adaptation specification is low. This paper proposes a more generic model which allows the adaptation to be defined in an arbitrary number of layers, where adaptation is expressed in terms of relationships between concepts. This model allows the creation of more powerful yet easier to use graphical authoring tools. This paper presents the structure of the Conceptual Adaptation Models used in adaptive applications created within the GRAPPLE adaptive learning environment, and their representation in a graphical authoring tool

Defining adaptation in a generic multi layer model : CAM: the GRAPPLE conceptual adaptation model

Authoring of Adaptive Hypermedia is a difficult and time consuming task. Reference models like LAOS and AHAM separate adaptation and content in different layers. Systems like AHA! offer graphical tools based on these models to allow authors to define adaptation without knowing any adaptation language. The adaptation that can be defined using such tools is still limited. Authoring systems like MOT are more flexible, but usability of adaptation specification is low. This paper proposes a more generic model which allows the adaptation to be defined in an arbitrary number of layers, where adaptation is expressed in terms of relationships between concepts. This model allows the creation of more powerful yet easier to use graphical authoring tools. This paper presents the structure of the Conceptual Adaptation Models used in adaptive applications created within the GRAPPLE adaptive learning environment, and their representation in a graphical authoring tool