In this paper, physical bounds on scattering of acoustic waves over a frequency interval are discussed based on the holomorphic properties of the scattering amplitude in the forward direction. The result is given by a dispersion relation for the extinction cross section which yields an upper bound on the product of the extinction cross section and the associated bandwidth of any frequency interval

Broadband

For decades, in vitro expansion of transplantable hematopoietic stem cells (HSCs) has been an elusive goal. Here, we demonstrate that multipotent adult progenitor cells (MAPCs), isolated from green fluorescent protein (GFP)-transgenic mice and expanded in vitro for >40-80 population doublings, are capable of multilineage hematopoietic engraftment of immunodeficient mice. Among MAPC-derived GFP+CD4

The aim of this study was to characterize impairment and subsequent recovery of postural control after spinal cord injuries. Experiments were carried out on rabbits with three types of lesion--a dorsal (D), lateral (L), or ventral (V) hemisection (HS) at T(12) level. The animals were maintaining equilibrium on a platform periodically tilted in the frontal plane. We assessed the postural limb/trunk

Abstract is not available

Within the local energy independent pseudopotential theory, a convergent supercell calculation of the position of the discrete impurity level produced by the neutral undistorted vacancy in silicon has been performed. Translational symmetry was reintroduced by placing the impurities on a Bravais lattice. The author made calculations with unit cells containing up to 2662 atoms plus vacancy. A deep l

Computed tomography (CT) is one of the most important modalities in a radiological department. This technique not only produces images that enable radiological reports with high diagnostic confidence, but it may also provide an elevated radiation dose to the patient. The radiation dose can be reduced by using advanced image reconstruction algorithms. This study was performed on a Brilliance iCT, e

Seeds from oak, horse chestnut, hawthorn, and sloe were exposed to seed predation during one week in autumn and over winter (for 6 months) in two different years. Three different exposure treatments were used and designed to exclude (1) small mammals and birds or (2) birds or (3) none. Insects and slugs had access to all exposures. 16 replicate experiments were set up in different deciduous woods

This doctoral thesis examines early medieval Slavic migration to the island of Bornholm (Denmark). With a combination of interdisciplinary theories and approaches, which focus on human translocation and memory and identity construction, a holistic approach to the studies of migration in archaeology is proposed. It is argued that in order to address cases of migration it is necessary to consider th

Kulturartikel om EU:s bestämmelser om terroristbrott, med avseende på sociala rörelser och demokrati.