Species of the genus Wolffia are traditionally used as human food in some of the Asian countries. Therefore, all 11 species of this genus, identified by molecular barcoding, were investigated for ingredients relevant to human nutrition. The total protein content varied between 20 and 30% of the freeze-dry weight, the starch content between 10 and 20%, the fat content between 1 and 5%, and the fiber content was ~25%. The essential amino acid content was higher or close to the requirements of preschool-aged children according to standards of the World Health Organization. The fat content was low, but the fraction of polyunsaturated fatty acids was above 60% of total fat and the content of n-3 polyunsaturated fatty acids was higher than that of n-6 polyunsaturated fatty acids in most species. The content of macro- and microelements (minerals) not only depended on the cultivation conditions but also on the genetic background of the species. This holds true also for the content of tocopherols, several carotenoids and phytosterols in different species and even intraspecific, clonal differences were detected in Wolffia globosa and Wolffia arrhiza. Thus, the selection of suitable clones for further applications is important. Due to the very fast growth and the highest yield in most of the nutrients, Wolffia microscopica has a high potential for practical applications in human nutrition.

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Zusammenfassung: Das Projekt KEMIE ( K inder E rleben M it I hren E ltern Chemie) ist ein langfristig angelegtes Eltern-Kind-Projekt, das sich an Kinder ab der 3. bis einschließlich der 6. Jahrgangsstufe und deren Eltern richtet. Dabei stehen die Eltern ihren Kindern als Experimentier-und Lernpartner zur Seite. Die Ent wicklung der insgesamt neun Versuchstage, die über einen Zeitraum von Oktober bis Juni stattfi nden, basiert auf einem didaktischen Konzept, das die Leitlinien "naturwissenschaftliche Denk-und Arbeits weisen", "Stoff-StrukturEigenschaften" und "Alltagsbezug" ein schließt. Als Ver anstaltungsort für das KEMIE-Projekt wird ein außerschulischer Lernort, nämlich das Alfried Krupp-Schüler labor der Ruhr-Universität Bochum, ge nutzt. In diesem Beitrag werden das didaktische Konzept und Schwerpunkte eines fachmethodischen Spiralcurriculums exemplarisch vorgestellt sowie erste Ergebnisse zur Annahme des Projektes durch die Teilnehmer präsentiert. Stichworte: Eltern und Kinder · fachmethodisches Sprialcurriculum · naturwissenschaftliche Denk-und Arbeitsweisen KEMIE: Children Experience Chemistry with their ParentsAbstract: KEMIE is a long-term project addressed to children from third to sixth grade and their parents in which the adults act as partners for their children in matters of experimenting and learning. The nine days of experimentation, which span from October to June, are based on a pedagogical concept which consists of three guidelines: scientifi c methods of thinking and operation, substance-structure-characteristics and connection to everyday life. The project takes place at an extracurricular location: the Alfried Krupp-Schülerlabor of the RuhrUniversity in Bochum. This article presents model descriptions the pedagogical conception and focal points of a methodical spiral curriculum as well as fi rst results concerning the participants' acceptance of the project.

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