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The H.E.S.S. collaboration recently reported the discovery of VHE γ-ray emission coincident with the young stellar cluster Westerlund 2. This system is known to host a population of hot, massive stars, and, most particularly, the WR binary WR 20a. Particle acceleration to TeV energies in Westerlund 2 can be accomplished in several alternative scenarios, therefore we only discuss energetic constraints based on the total available kinetic energy in the system, the actual mass loss rates of respective cluster members, and implied gamma-ray production from processes such as inverse Compton scattering or neutral pion decay. From the inferred gammaray luminosity of the order of 1035erg/s, implications for the efficiency of converting available kinetic energy into non-thermal radiation associated with stellar winds in the Westerlund 2 cluster are discussed under consideration of either the presence or absence of wind clumping.
Using the gaze-contingent boundary paradigm with the boundary placed after word n, we manipulated preview of word n+2 for fixations on word n. There was no preview benefit for first-pass reading on word n+2, replicating the results of Rayner, Juhasz, and Brown (2007), but there was a preview benefit on the three-letter word n+1, that is, after the boundary, but before word n+2. Additionally, both word n+1 and word n+2 exhibited parafoveal-on-foveal effects on word n. Thus, during a fixation on word n and given a short word n+1, some information is extracted from word n+2, supporting the hypothesis of distributed processing in the perceptual span.
Phototropic microalgae have a large potential for producing valuable substances for the feed, food, cosmetics, pigment, bioremediation, and pharmacy industries as well as for biotechnological processes. Today it is estimated that the microalgal aquaculture worldwide production is 5000 tons of dry matter per year (not taking into account processed products) making it an approximately $1.25 billion U.S. per year industry. In this work, several spectroscopic techniques were utilized for the investigation of microalgae cells. Specifically, photondensity wave spectroscopy was applied as a technique for the on-line observation of the culture. For effective evaluation of the photosynthetic growth processes, fast and non-invasive sensor systems that analyze the relevant biological and technical process parameters are preferred. Traditionally, the biomass in a photobioreactor is quantified with the help of turbidimetry measurements, which require extensive calibration. Another problem frequently encountered when using spectral analysis for investigating solutions is that samples of interest are often undiluted and highly scattering and do not adhere to Beer-Lambert's law. Due to the fluorescence properties of chlorophyll, fluorescence spectroscopy techniques including fluorescence lifetime imaging and single photon counting could be applied to provide images of the cells as well as determine the effects of excitation intensity on the fluorescence lifetime, which is an indicator of the condition of the cell. A photon density wave is a sinusoidally intensity-modulated optical wave stemming from a point-source of light, which propagates through diffuse medium and exhibits amplitude and phase variations. Light propagation though strongly scattering media can be described by the P1 approximation to the Boltzmann transport equation. Photon density wave spectroscopy enables the ability to differentiate between scattered and absorbed light, which is desired so that an independent determination of the reduced scattering and absorption coefficients can be made. The absorption coefficient is related to the pigment content in the cells, and the reduced scattering coefficient can be used to characterize physical and morphological properties of the medium and was here applied for the determination of the average cell size.
Rezensiertes Werk: Schmidlin, Johann Lorenz: Pictura docens / Johann Lorenz Schmidlin. Hrsg. und übers. von Fritz Felgentreu und Widu-Wolfgang Ehlers. - Stuttgart- Bad Cannstatt : Frommann-Holzboog, 2007. - XCVI, 227 S. : Ill. - (Clavis pansophiae ; 4) ISBN-10 3-7728-2428-5 ISBN-13 978-3-7728-2428-9
Rezensiertes Werk: Sefer Mišlė šuʿolim (Buch der Fuchsfabeln) / von Jakob Koppelmann. In Originalschrift und Transkription hrsg. und kommentiert von Jutta Schumacher. - Hamburg : Buske, 2006. - XCVII, 359 S. - (Jidische schtudies ; 12) Zugl.: Trier, Univ., Diss. J. Schumacher, 2004/05 u.d.T.: Das jiddische "Buch der Fuchsfabeln" von Jakob Koppelmann in der europäischen Fabeltradition ISBN-10 3-87548-454-1 ISBN-13 978-3-87548-454-0
Rezensiertes Werk: Geschützt, geduldet, gleichberechtigt ... : die Juden im baden-württembergischen Franken vom 17. Jahrhundert bis zum Ende des Kaiserreichs (1918) / hrsg. von Gerhard Taddey. - Ostfildern : Thorbecke, 2005. - 214 S. : Ill., graph. Darst., Kt. - (Forschungen aus Württembergisch-Franken ; 52) ISBN 3-7995-7653-3
Rezensiertes Werk: Linhardt, Marion: Residenzstadt und Metropole : zu einer kulturellen Topographie des Wiener Unterhaltungstheaters (1858 - 1918) / Marion Linhardt. - Tübingen : Niemeyer, 2006. - VIII, 312 S. : Ill. - (Theatron ; 50) Zugl.: Bayreuth, Univ., Habil.-Schr., 2004 ISBN-10 3-484-66050-3 ISBN-13 978-3-484-66050-2