Nachweis von Scilliglaucosidin in den Zwiebeln vonBowiea volubilis Harvey

Summary Hellebrigenin was converted to Scilliglaucosidin-19-ol and 3-Epi-Scilliglaucosidin-19-ol. This proves the correctness of the assumption ofStoll et al. ³ that the aldehydic group of Scilliglaucosidin is in position C-10.Comparison of a reduction product of Nabogenin, a substance isolated earlier from the bulbs ofBowiea volubilis Harvey, with Scilliglaucosidin-19-ol and 3-Epi-Scilliglaucosidin-19-ol showed its identity with the first named compound. This proves that the so called Nabogenin was a mixture consisting mainly of Scilliglaucosidin.

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8. Mitteilung über die Glykoside vonBowiea vocubilis Harvey und 162. Mitteilung über Glykoside und Aglykone.

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7. Mitt.:A. Katz, Helv. chim. Acta38, 1565 (1955).

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161. Mitt.:H. Kündig-Hegedüs undO. Schindler, Helv. chim. Acta39, 904 (1956).     

The dynamics of melt and shear localization in partially molten aggregates

The volcanoes that lie along the Earth's tectonic boundaries are fed by melt generated in the mantle. How this melt is extracted and focused to the volcanoes, however, remains an unresolved question. Here we present new theoretical results with implications for melt focusing beneath mid-ocean ridges. By modelling laboratory experiments, we test a formulation for magma dynamics and provide an explanation for localized bands of high-porosity and concentrated shear deformation observed in experiments. These bands emerge and persist at 15 degrees-25 degrees to the plane of shear. Past theoretical work on this system predicted the emergence of melt bands but at an angle inconsistent with experiments. Our results suggest that the observed band angle results from a balance of porosity-weakening and strain-rate-weakening deformation mechanisms. Lower band angles are predicted for greater strain-rate weakening. From these lower band angles, we estimate the orientation of melt bands beneath mid-ocean ridges and show that they may enhance magma focusing toward the ridge axis.     

Researcher–Practitioner Partnering in Industry-Funded Participatory Action Research

This paper reflects on our experiences with researcher–practitioner partnering within an industry-funded Participatory Action Research (PAR) project. We find that the nature of partnering in our industry-funded engagement differs from that of traditional, non-industry funded PAR research. The distribution of power on the industry-funded academic-practitioner research team, whilst fairly equitable at the outset of the project, shifted in favour of the practitioner partners with the progressive spillover of credibility and knowledge from the academic to practitioner partners during the course of the engagement. Adhering to recommendations for academic-practitioner research teams, in our experience, does not guarantee successful partnering according to PAR due to the spillover problem. As the academic partners' power base erodes, the discretion to preserve the integrity of the PAR method is increasingly placed in the hands of the practitioner partners.     

Integrating Participatory Learning and Action Research and Systems Ecology: A Potential for Sustainable Agriculture Transitions

This article explores the potential of integrating Participatory Learning and Action Research (PLAR) and Systems Ecology (SE) for improving research capability in facilitating sustainable development transitions in agriculture. Goal conflicts that arose in a PLAR group working on sustainability issues in small-scale organic tomato production are analysed from the perspective of SE. The possibility to improve agency for sustainable development by the merger of PLAR and SE are discussed. It is concluded that the approaches together could provide a sounder base for systemic research and transitions in agriculture.