Popular Abstract in Swedish Energiförsörjning är essentiellt för alla samhällen världen över, men jordens resurser är inte obegränsade. Växter utgör en stor källa av förnyelsebara råvaror som skulle kunna användas för att ersätta en del fossila energikällor och material. I växters cellväggar finns olika typer socker som sitter ihop i kedjor av så kallade polysackarider. Cellulosa är den mest kändaβ-Mannoside hydrolases are enzymes that are involved in conversion of the major soft-wood hemicellulose O-acetyl-galactoglucomannan, an important renewable biomass resource. They belong to clan A of glycoside hydrolases and share a common (β/α)8-TIM barrel fold. For their catalysis, they use a two-step retaining double displacement mechanism, and may in addition to hydrolysis also perform transgly

Building on the results of a mapping project, the paper examines two kinds of knowledge, "expert knowledge" and "scientific knowledge" with regard to "dilemmas of exclusion, circularity and infinite regress" (Paulston, 2000a, p. 9) and the consequences of these dilemmas, when seen with another imagination than that used to construct the knowledge built upon them. The constructive imagination used

This article outlines an experimental and numerical study of the long-term interaction between silica fume and Portland cement in concrete subjected to air, water or sealed curing. For this purpose about 2000 kg of eight qualities of concrete were studied at 4 different ages each over a period of 90 months. Half of the concretes contained silica fume. Parallel studies of strength, hydration and in

Popular Abstract in Swedish De flesta produkter som vi dagligen använder tillverkas genom att utnyttja fossila råvaror som olja, kol och naturgas. Ett stort problem är att dessa råvaror bara finns i begränsade mängder i naturen, vilket medför att de förr eller senare tar slut. Dessutom medför förbränning av fossila råvaror att det bildas miljöskadande gaser (t.ex. koldioxid) som ansamlas i atmosfäOne of the major challenges facing the world today is the reduction of our dependency on fossil resources as their exploitation has severe negative effects on the environment. One way of realizing this is to utilise the components of lignocellulosic biomass to a greater extent as feedstock for various industrial products. However, such utilisation requires the extraction of the biopolymers from th

The objective of this paper is to review the fundamental macroscopic modeling of linear complex materials in a time domain formulation. Based upon a set of basic assumptions, the general form of the constitutive relations for a linear complex media in the time domain is formulated. Furthermore, constraints on the possible form of the susceptibility kernels for a passive medium are presented. For c