Ulrich Hamm

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The phase shifting action of low temperature pulses of 6 degrees C and 2 h duration administered to the various phases of the Drosophila pseudoobscura circadian rhythm and the action of light pulses given 30 min after the beginning of these low temperature pulses have been investigated. The phase response curve obtained from experiments with light pulses(More)
Consumer interest in organic products is growing alongside a diversification of the supply. In order to serve consumers actual needs and wants regarding organic products, those involved in the market need to be informed about consumers' perception of organic products. Therefore, the state of research as regards consumers' perception of organic product(More)
Local production is becoming an increasingly important food attribute for consumers due to inter alia recent food scandals and the growing complexity of food production. Especially in the organic food market, local production is seen as an important additional value. Even though there is a high preference for local food, it is still unknown, what organic(More)
There are many publications focusing on diverse aspects of marketing research for organic products. However, so far there have been very few attempts to provide an overall synthesis of current knowledge. The present study therefore gives an overview of marketing research for organic food consumption, enabling the identification of research strengths and(More)
Ethical consumerism is a growing trend worldwide. Ethical consumers' expectations are increasing and neither the Fairtrade nor the organic farming concept covers all the ethical concerns of consumers. Against this background the aim of this research is to elicit consumers' preferences regarding organic food with additional ethical attributes and their(More)
DISCLAIMER This publication was generated as part of the CERTCOST Project, agreement no. 207727 (http://www.certcost.org), with financial support from the European Community under the 7 th Framework Programme. The publication reflects the views of the author(s) and not those of the European Community, who is not to be held liable for any use that may be(More)
Fish from aquaculture is becoming more important for human consumption. Sustainable aquaculture procedures were developed as an alternative to overcome the negative environmental impacts of conventional aquaculture procedures and wild fisheries. The objective of this contribution is to determine what consumers expect from sustainable aquaculture and whether(More)
Members of the organic supply chain need high-quality data to make correct investment decisions, but data with sufficient depth and quality are not widely available in Europe. The quality of available data is a key concern for both data collectors and data users. The aim of this study is to identify whether the commonly used quality attributes (accuracy,(More)
Organic agriculture can and should play an important role in solving future challenges in producing food. The low level of external inputs combined with knowledge on sustainablity minimizes environmental contamination and can help to produce more food for more people without negatively impacting our environment. Organic agriculture not only includes farming(More)