The paper presents the impact of using computer-supported cooperative work tools in building educational environments and the facilities such tools bring to educational methodologies. It also shows the relation between this new technique and the learnercentered approach in education, a participative style of education in which the learner is actively involved in the learning process, while stre...

to any given H + :P ratio. If the ratio is 3 and the permittivity 20, the distance is approximately 0.3nm. Unlike the electrochemical parameters, $“+ values do not depend on a cumulative ion effect; one proton alone at the right distance from a fixed charge will be at the potential required for synthetic activity. On these terms the rate of synthesis is determined by the number of charge<harge ...

1.1. These guidelines apply to distribution of active substances, as defined in Article 1(3a) of Directive 2001/83/EC, for medicinal products for human use. According to that provision, an active substance is any substance or mix­ ture of substances intended to be used in the manufacture of a medicinal product and that, when used in its production, becomes an active ingredient of that product i...

Magnetic connections to the plunging region can exert stresses on the inner edge of an accretion disk around a black hole. We recompute the relativistic corrections to the thin-disk dynamics equations when these stresses take the form of a time-steady torque on the inner edge of the disk. The additional dissipation associated with these stresses is concentrated relatively close outside the marg...

Roundup Transorb (RT) is a glyphosate-based herbicide and despite its wide use around the world there are few studies comparing the effects of the active ingredient with the formulated product. In this context the purpose of this study was to compare the genotoxicity of the active ingredient glyphosate with the formulated product RT in order to clarify whether the active ingredient and the surf...

Recently Umemura, Fukue, & Mineshige (1997) proposed the radiative avalanche fueling to active galactic nuclei; gas accretion is driven by radiation drag exerted by stellar radiation from circumnuclear starburst regions. This mechanism is also interesting in terms of starburst-AGN connections. We therefore present observational tests for the radiative avalanche fueling. Our tests, however, show...

Abstract Potentially explosive atmosphere can occur not only in the production systems of food, energy, chemical and petrochemical industries but also processes mining industry. Gases, vapours, mists dusts arise escape an uncontrolled way during production, processing, transportation storage flammable substances. In combination with oxygen, they create atmospheres that, if ignited, lead to expl...