One of the challenges of this century is to transform our current economy into an eco-friendly and self-sustaining system. An innovative approach is the use of mycelium for the development of materials. Mycelium is an interwoven network of fungal filamentous cells called hyphae. Fungi form these mycelia on a wide variety of organic substrates. Mushroom forming fungi are known for their efficient colonization of ligno-cellulosic substrates like wood and straw. In a project of NWO Creative Industry we have developed sub-millimeter to centimeter thick layers of pure mycelium of a mushroom forming fungus. Depending on growth conditions and treatment, materials have been obtained that resemble paper, rubber, plastic and wood.

Composite biomaterials are achieved by growing mycelium of mushroom forming fungi organisms as Schizophyllym commune (split gill fungus), in a matrix of organic material such a s saw dust. The resulting materials resemble cork and wood and were used to make panels and objects. In this project, we aim to develop a palette of mycelium-based composite materials with different physical properties. Designers, artists, producers and end-users will explore the potential of the materials and will provide feedback how to improve the properties of the mycelium. This should result in tailor-made mycelia for innovative design solutions and new concepts of sustainable materials.

• prof. dr. H.A.B. (Han) Wösten
• dr. P. (Pauline) Krijgsheld

• M. (Maurizio) Montalti Msc Design Academy Eindhoven (DEA)
• dr. E. (Elvin) Karana Design Engineering Delft University of Technology (TUD)

Fungi form a mycelium of interconnected hyphae that grow and secrete at their tips and that branch sub-apically. Hyphae of most fungi are compartmentalized by septa that have pores with a diameter > 100 nm. These pores allow translocation of cytosol and even organelles within and between hyphae. Therefore, it was generally believed that the cytoplasm within a mycelium is continuous. This also explained why multiple compartments support the growth process at the hyphal tip. However, we have recently shown that septal pores can be closed in growing hyphae by means of specialized organelles. Closure is a dynamic process that is influenced by environmental conditions. This raises the questions whether compartments have their own molecular and functional identity, whether this identity results in functional synergism, and how closure of septal pores impacts these processes. These questions will be addressed in this proposal using Aspergillus niger as a model system. This fungus is widely used by the industry for the production of proteins and metabolites. We will use highly innovative technologies including life time imaging of protein translocation in hyphae and single cell expression analysis. In fact, we recently were the first who successfully adopted whole genome single cell expression analysis in a microbe. The results of this study are not only of fundamental importance, they may also provide insights how Aspergillus niger, and other fungi, can be improved as a cell factory.

• prof. dr. H.A.B. (Han) Wösten
• dr. W.R. (Wieke) Teertstra
• dr. M. (Martin) Tegelaar

• dr. R. B. J. Bleichrodt