In this thesis, material of recent hop from different locations in Sweden have been analyzed with EA-IRMS for carbon-, nitrogen- and sulfur isotopes. The aim has been to find a method to distinguish between cultivated and wild hops, and whether it is a useful method for provenancing of hop. Furthermore, hop fruit from archaeological sites have been analyzed with the same method. An experimental water immersion of recent hop fruits has also been carried out, to investigate how this would affect the isotopic values.

To regain knowledge, to regain power: An ethnobotanical study of how traditional knowledge about medicinal plants in Jämtland is interpreted, used and passed on today is an essay that explores different meanings of people's relationships with plants, traditional knowledge, trade, sustainability and local identity. It does this through the knowledge and stories shared by six persons with a common interest in medicinal plants in county Jämtland, Sweden. The interviewees illustrate different aspects of their relationships with plants. Through this, the thesis demonstrates how the knowledge about the medicinal plants is incorporated into the participants in the form of a doing. It also explores how this knowledge is traded and how trade includes various aspects of learning where the traditional knowledge is formed based on personal context and in relation to nature. How humans and nature interact and how nature gives man peace and health through continuous relationships is also prominent. The value of preserving this knowledge and how examples, such as the importance of sustainability, become a valued interpretation in a contemporary context. This is also true in regards to how nature can affect people's identity creation and how local identity can be linked to plants.  Keywords: medicinal plants, traditional knowledge, local identity, sustainability, trade, ethnobotany.