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Laser and synchrotron radiation pump-probe x-ray diffraction experiments

Recent developments have allowed x-ray diffraction techniques at synchrotron radiation facilities to be employed with a temporal resolution of around 1 ps. These developments are the availability of firstly, high brightness third-generation x-ray sources, secondly, passively mode-locked lasers with 100 fs temporal duration and thirdly, averaging streak cameras with sub-picosecond temporal resoluti

Does exercise during growth prevent fractures in later life?

Regular weight-bearing exercise, especially during the pre- or early peripubertal years, leads to substantial benefits in bone mass and skeletal structure, enhancing bone strength at loaded sites. However, few fragility fractures occur in young adulthood, and only if the exercise-induced skeletal benefits are retained into older age, a time when the incidence of fragility fractures rises exponenti

Insulinoscillationer--en kliniskt betydelsefull rytmik. Diabeteslakemedel bor oka den pulsatila komponenten av insulinfrisattningen

The concentration of circulating insulin oscillates with periods of 3-6 min due to pulsatile release of the hormone from the pancreas. Pulsatile insulin secretion from the individual * cell is driven by slow cycles of Ca2+ elevation due to periodic depolarisation. The Ca2+ oscillations of individual * cells in the islets of Langerhans are entrained into a common rhythm by gap junctional coupling a

Human neuroblasts migrate to the olfactory bulb via a lateral ventricular extension

The rostral migratory stream (RMS) is the main pathway by which newly born subventricular zone cells reach the olfactory bulb (OB) in rodents. However, the RMS in the adult human brain has been elusive. We demonstrate the presence of a human RMS, which is unexpectedly organized around a lateral ventricular extension reaching the OB, and illustrate the neuroblasts in it. The RMS ensheathing the lat

Harmonic morphisms, Hermitian structures and symmetric spaces

Popular Abstract in Swedish En harmonisk morfism är en funktion mellan två Riemannmångfalder, med den egenskapen att dess sammansättning med en lokal harmonisk funktion på bildmängden ånyo är en lokal harmonisk funktion på definitionsmängden. En sådan funktion är automatiskt en harmonisk avbildning, som dessutom är (svagt) horisontellt konform. I lokala koordinater betyder detta att funktionen måsA harmonic morphism is a map between two Riemannian manifolds with the property that its composition with a local harmonic function on the codomain is a local harmonic function on the domain. Such a map is automatically a harmonic map, satisfying an additional partial conformality condition called horizontal (weak) conformality. In local coordinates, this amounts to a non-linear, over-determined s