The novel cytotoxic hexacyclic illudane-illudalane bis-sesquiterpene bovistol (la) was obtained from the basidiomycete Bovista sp. 96042, together with several new sesquiterpenes. la is formed in the fungus by a heteroatom Diels-Alder dimerisation of psathyrellon B (2). (C) 2002 Elsevier Science Ltd. All rights reserved.

Popular Abstract in Swedish Denna avhandling behandlar två ämnen inom trådlös kommunikation: interferens mellan frekvenshoppande (FH) nätverk och fleranvändardiversitet. I arbetet på FH nätverk undersöks ett system där frekvenshopp används för att möjliggöra samtidig tillgång till kanalen för multipla okoordinerade nätverk. Detta åstadkoms genom att frekvenshoppen sker varje gång ett ny paket skaThis thesis deals with two topics in wireless communications: interference between frequency-hopping (FH) networks, and multiuser diversity. The work on FH treats a system where FH is used to provide simultaneous access to the channel for multiple uncoordinated wireless networks. This is achieved by performing frequency hops on a packet-by-packet basis, and letting the sequence of hopping frequen

The mobile phone is one of the most widespread devices with rendering capabilities. Those capabilities have been very limited because the resources on such devices are extremely scarce; small amounts of memory, little bandwidth, little chip area dedicated for special purposes, and limited power consumption. The small display resolutions present a further challenge; the angle subtended by a pixel i

Abstract is not available

Popular Abstract in Swedish Under kvartärtiden (de senaste 2,6 miljoner åren) har istider (glacialer) och mellanistider (interglacialer) avlös varandra. Mellanistider är perioder (ca 10 000 år) mellan istider (ca 100 000 år), vilket innebär att istid varit det normala under kvartärtiden och att Holocene, den istid vi nu lever i, endast representerar ett kortare intervall. Under istiderna täckte inThe aim of this thesis was to reconstruct the glaciodynamics, deglacial landforms, isostatic uplift and to date the deglaciation. Glaciodynamics and deglacial landforms were focused on to provide a process and depositional model for De Geer moraine and Niemisel moraine and to reveal their internal and spatial relationship, based on detailed sedimentological and structural investigations. The isost

Growth of the smooth muscle in the rat portal vein was initiated by an increased transmural pressure. After 7 days, the cross-sectional area of the vessel wall and the maximal active force of the longitudinal muscle layer had increased twofold. Electron microscopy showed that the cell cross-sectional area was increased, suggesting cellular hypertrophy. Increased amounts of intermediate (10 nm) fil

In treatment of Meniére's disease, installations of gentamicin are continued until there are signs of disturbance of vestibular or cochlear function. However, since it has been demonstrated that gentamicin is eliminated slowly from the inner ear, a continuing ototoxic effect may be suspected. The present study aimed to investigate the delay of onset of symptoms of ototoxic effects. Five patients w

Latent autoimmune diabetes in adults (LADA) is a disorder in which, despite the presence of islet antibodies at diagnosis of diabetes, the progression of autoimmune ß-cell failure is slow. LADA patients are therefore not insulin requiring, at least during the first 6 months after diagnosis of diabetes. Among patients with phenotypic type 2 diabetes, LADA occurs in 10% of individuals older than 35

The aim of this prospective longitudinal study was to measure prospectively the bone mineral density (BMD) and anthropometric variables after a hip fracture. In particular, we studied changes in the BMD in both the injured and uninjured hips, and examined if the postoperative mortality rate and complications, including pseudarthrosis of the fracture and late segmental collapse of the head of the f

Objectives. To study the relationship between clinical manifestations in systemic lupus erythematosus (SLE) with polymorphisms in suggested susceptibility genes encoding Fc gamma RIIa, Fc gamma RIIIa, Fc gamma RIIIb, CRP and IL-1Ra. Methods. Genetic polymorphisms were analysed in 323 unrelated SLE patients and 200 healthy blood donors. The genotype frequencies were compared between clinical subset

Clinical practice guidelines attempt to bridge the gap between the generation of scientific evidence and its application. For cardiovascular risk reduction, the implementation of knowledge into practice, both with respect to lifestyle change and pharmacological treatment, has been shown to be poor. There are several reasons for this 'guidelines gap', with physician factors including insufficient t

High concentration carbon dioxide (CO2) is used to promote pre-slaughter anaesthesia in swine and poultry, as well as short-lasting surgical anaesthesia and euthanasia in laboratory animals. Questions related to animal welfare have been raised, as CO2 anaesthesia does not set in momentarily. Carbon dioxide promotes anaesthesia by lowering the intracellular pH in the brain cells, but the dynamics o

Popular Abstract in Swedish Denna avhandling utgöres av två separata rapporter, där studieobjektet för den första är en vektorvärd Sturm-Liouville ekvation på formen -(PU')'+QU=zU, xin[0,b), med P^{-1},W,Q hermiteska med lokalt integrerbara matriselement; och under vissa ytterligare villkor på P^{-1} och W. Under dessa förutsättningar härleds några huvudresultat beträf- fande asymptotiken, då z igThis discourse is constituted by two separate reprots, where the first one offers an elementary deduction of the leading order term asymptotics for the Titchmarsh-Weyl M-function corresponding to a vector-valued Sturm-Liouville equation of the form -(PU')'+QU=zu, xin[0,b), with P^{-1},W,Q being hermitean with locally integrable entries; and under some additional conditions on P^{-1} and W. In the

Popular Abstract in Swedish Denna avhandling bygger på en kritisk granskning av spänningen mellan etablerade och alternativa perspektiv på hållbarhetsproblematiken, med utgångspunkt i fyra olika diskurser: miljöekonomi, ekologisk ekonomi, adaptive management och bioregionalism. De fyra diskurserna representerar olika försök att i tilltagande grad utmana etablerade, modernistiska perspektiv på sociThis dissertation critically examines the tension between mainstream and counterpoint perspectives on sustainability on the basis of analyses of four approaches to this issue: environmental economics, ecological economics, adaptive management, and bioregionalism, which are presented as successive attempts to challenge mainstream, modernist perspectives on socio-ecological relationships. The differ