The test substance is administered in graduated doses to several groups of males and females. Males should be dosed for a minimum of four weeks. Females should be dosed throughout the study, so approximately 54 days. This Test Guideline is designed for use with the rat. It is recommended that...

This screening Test Guideline describes the effects of a test chemical on male and female reproductive performance. It has been updated with endocrine disruptor endpoints, in particular measure of anogenital distance and male nipple retention in pups and thyroid examination. The test substance...

This screening Test Guideline describes the effects of a test chemical on male and female reproductive performance. It has been updated with endocrine disruptor endpoints, in particular measure of anogenital distance and male nipple retention in pups and thyroid examination. The test substance...

Lernen ist in der Wissensgesellschaft des 21. Jahrhunderts zentral. Dennoch hat sich im Schulunterricht seit dem Anfang des 20. Jahrhunderts bis heute wenig verändert. Der Band des OECD Center for Educational Research and Innovation (CERI) sammelt Beiträge aus der pädagogischen Praxis und...

OECD economies have experienced the transformation from their traditional industrial base to the knowledge era, in which learning and innovation are central. Yet, many of today’s schools have not caught up: they continue to operate as they did in the earlier decades of the 20 century. This...

Some 65% of socio-economically advantaged students reported that they know well or have often heard of the concept of quadratic function, on average across OECD countries; but only 43% of disadvantaged students so reported. On average across OECD countries, the 20% of students who are most...