Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids

In the past, constraining the surface composition of near-Earth asteroids (NEAs) has been difficult due to the lack of high quality near-IR spectral data (0.7-2.5 microns) that contain mineralogically diagnostic absorption bands. Here we present visible (0.43-0.95 microns) and near-infrared (0.7-2.5 microns) spectra of nine NEAs and five Mars-crossing asteroids (MCs). The studied NEAs are: 4055 Magellan, 19764 (2000 NF5), 89830 (2002 CE), 138404 (2000 HA24), 143381 (2003 BC21), 159609 (2002 AQ3), 164121 (2003 YT1), 241662 (2000 KO44) and 2007 ML13. The studied MCs are: 1656 Suomi, 2577 Litva, 5407 (1992 AX), 22449 Ottijeff and 47035 (1998 WS). The observations were conducted with the NTT at La Silla, Chile, the 2.2 m telescope at Calar Alto, Spain, and the IRTF on Mauna Kea, Hawai'i. The taxonomic classification (Bus system) of asteroids showed that all observed MC asteroids belong to the S-complex, including the S, Sr and Sl classes. Seven of the NEAs belong to the S-complex, including the S, Sa, Sk and Sl classes, and two NEAs were classified as V-types. The classification of the NEA 164121 (2003 YT1) as a V-type was made on the basis of its near-infrared spectrum since no visible spectrum is available for this asteroid. A mineralogical analysis was performed on six of the asteroids (those for which near-IR spectra were obtained or previously available). We found that three asteroids (241662 (2000 KO44), 19764 (2000 NF5), 138404 (2000 HA24)) have mafic silicate compositions consistent with ordinary chondrites, while three others (4055 Magellan, 164121 (2003 YT1), 5407 (1992 AX)) are pyroxene-dominated basaltic achondrite assemblages. In the case of 5407 (1992 AX) we found that its basaltic surface composition contrasts its taxonomic classification as a S-type.Comment: 23 pages, 10 figures, 3 tables, accepted for publication in Icaru

The key aspects of innovation-oriented regional industrial and economic policy

Integration processes taking place in the economy, the new requirements to enhance the effectiveness of production during international competition as well as the need to ensure the social conditions lead to the development and implementation of innovation-oriented regional industrial and economic policy, which in its turn, requires adopting substantial organizational and economic recommendations

No Germany-wide housing bubble but overvaluation in regional markets and segments

Although the housing prices in the 127 largest German cities have surged strongly in recent years, there is still no sign of a Germanywide housing bubble. In comparison with 2009, the price of condominiums has risen by around 55 percent. Single-family houses cost between 38 and 45 percent more in 2016 than seven years prior, and building lot prices have risen by around 63 percent. The study at hand shows that concerns about a national housing bubble are largely unfounded. There may, however, be bubbles on the local level -primarily in the relatively small segment of new multi-story apartment buildings but also with regard to the valuation of undeveloped residential land. Given the situation, it seems appropriate that financial regulators have opened up more policy options in order to intervene when the market trend proves unsustainable. But because the measures were diluted in the federal legislative process, the need for policy-related action remains

The role of toll-like receptors (TLRs) in bacteria-induced maturation of murine dendritic cells (DCs) - Peptidoglycan and lipoteichoic acid are inducers of DC maturation and require TLR2

Toll-like receptors (TLRs) have been found to be key elements in pathogen recognition by the host immune system. Dendritic cells (DCs) are crucial for both innate immune responses and initiation of acquired immunity. Here we focus on the potential involvement of TLR ligand interaction in DC maturation. TLR2 knockout mice and mice carrying a TLR4 mutation (C3H/HeJ) were investigated for DC maturation induced by peptidoglycan (PGN), lipopolysaccharide (LPS), or lipoteichoic acids (LTAs). All stimuli induced maturation of murine bone marrow-derived DCs in control mice. TLR2− /− mice lacked maturation upon stimulation with PGN, as assessed by expression of major histocompatibility complex class II, CD86, cytokine, and chemokine production, fluorescein isothiocyanate-dextran uptake, and mixed lymphocyte reactions, while being completely responsive to LPS. A similar lack of maturation was observed in C3H/HeJ mice upon stimulation with LPS. DC maturation induced by LTAs from two different types of bacteria was severely impaired in TLR2− /−, whereas C3H/HeJ mice responded to LTAs in a manner similar to wild-type mice. We demonstrate that DC maturation is induced by stimuli from Gram-positive microorganisms, such as PGN and LTA, with similar efficiency as by LPS. Finally, we provide evidence that TLR2 and TLR4 interaction with the appropriate ligand is essential for bacteria-induced maturation of DCs

Ion shock acceleration by large amplitude slow ion acoustic double layers in laser-produced plasmas

A kinetic model for the shock acceleration of ions in laser-produced plasmas is developed. A fraction of the warm ions are accelerated by the large amplitude monotonic potential of the shock created due the plasma compression and electron heating by the laser. The kinetic model for the monotonic shock is based on the slow ion acoustic double layer (SIADL). It is found that the amplitude of the large amplitude SIADL is almost uniquely defined by the electron temperature. Therefore, a balance between electron heating and plasma compression is needed for optimal ion acceleration by this scheme. Typical Mach numbers of the monotonic shocks are close to 1.5. The scheme could potentially produce monoenergetic ions with a relative energy spread of less than 1%. The model is compared with recent simulations and experiments, where efficient shocks acceleration and production of monoenergetic protons have been observed. Similarities and differences with other shock models are pointed out and discussed

Nonribosomal peptides, key biocontrol components for Pseudomonas fluorescens In5, isolated from a Greenlandic suppressive soil.

UnlabelledPotatoes are cultivated in southwest Greenland without the use of pesticides and with limited crop rotation. Despite the fact that plant-pathogenic fungi are present, no severe-disease outbreaks have yet been observed. In this report, we document that a potato soil at Inneruulalik in southern Greenland is suppressive against Rhizoctonia solani Ag3 and uncover the suppressive antifungal mechanism of a highly potent biocontrol bacterium, Pseudomonas fluorescens In5, isolated from the suppressive potato soil. A combination of molecular genetics, genomics, and matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) imaging mass spectrometry (IMS) revealed an antifungal genomic island in P. fluorescens In5 encoding two nonribosomal peptides, nunamycin and nunapeptin, which are key components for the biocontrol activity by strain In5 in vitro and in soil microcosm experiments. Furthermore, complex microbial behaviors were highlighted. Whereas nunamycin was demonstrated to inhibit the mycelial growth of R. solani Ag3, but not that of Pythium aphanidermatum, nunapeptin instead inhibited P. aphanidermatum but not R. solani Ag3. Moreover, the synthesis of nunamycin by P. fluorescens In5 was inhibited in the presence of P. aphanidermatum. Further characterization of the two peptides revealed nunamycin to be a monochlorinated 9-amino-acid cyclic lipopeptide with similarity to members of the syringomycin group, whereas nunapeptin was a 22-amino-acid cyclic lipopeptide with similarity to corpeptin and syringopeptin.ImportanceCrop rotation and systematic pest management are used to only a limited extent in Greenlandic potato farming. Nonetheless, although plant-pathogenic fungi are present in the soil, the farmers do not experience major plant disease outbreaks. Here, we show that a Greenlandic potato soil is suppressive against Rhizoctonia solani, and we unravel the key biocontrol components for Pseudomonas fluorescens In5, one of the potent biocontrol bacteria isolated from this Greenlandic suppressive soil. Using a combination of molecular genetics, genomics, and microbial imaging mass spectrometry, we show that two cyclic lipopeptides, nunamycin and nunapeptin, are important for the biocontrol activity of P. fluorescens In5 both in vitro and in microcosm assays. Furthermore, we demonstrate that the synthesis of nunamycin is repressed by the oomycete Pythium aphanidermatum. Overall, our report provides important insight into interkingdom interference between bacteria and fungi/oomycetes

Die Mietpreisbremse wirkt bisher nicht

Am 1. Juni 2016 ist die viel diskutierte Mietpreisbremse ein Jahr in Kraft. Seither wurde sie in 308 Städten eingeführt. Die im Vorfeld geäußerten Befürchtungen, die dringend benötigte Bautätigkeit würde damit massiv ausgebremst, haben sich ebenso wenig bewahrheitet wie die Hoffnungen, die Neuregelung könne den Zugang von GeringverdienerInnen zum Wohnungsmarkt spürbar verbessern. Um die Wirkung der Mietregulierung zu beurteilen, reicht der alleinige Blick auf einzelne statistische Reihen allerdings nicht aus. Die vorliegende Studie untersucht deshalb, wie sich die Mieten verändert hätten, wenn keine Regulierung vorgenommen worden wäre und in welchem Umfang die Investoren ihre Ertragserwartungen durch die Regulierung beeinträchtigt sehen. Dazu werden Mieten und Wohnungspreise in benachbarten Postleitzahlbezirken analysiert, die sich darin unterscheiden, dass in einem Bezirk die Mietpreisbremse eingeführt wurde, während in dem anderen Bezirk der Markt unreguliert blieb. Die Ergebnisse dieses sogenannten Difference-in-Differences-Ansatzes legen nahe, dass die Mietpreisbremse den Anstieg der Mietpreise nicht entschleunigen konnte. Im Gegenteil: Sie hat kurzfristig sogar zu einem stärkeren Mietpreisanstieg in regulierten Märkten geführt. Auch scheinen Investoren der Auffassung zu sein, dass die Regulierung auch in Zukunft keine substanzielle Wirkung entfaltet: Die kausalen Effekte der Mietpreisbremse auf die Entwicklung der Wohnungspreise - als Reflektion zukünftiger Erträge aus der Vermietung - sind relativ gering. Um das Problem der Wohnungsknappheit nachhaltig zu lösen, sollten Maßnahmen im Vordergrund stehen, die eine Ausweitung der Bautätigkeit und eine Flexibilisierung des Wohnungsangebots ermöglichen. Aus sozialpolitischen Gesichtspunkten kann eine Mietpreisbremse temporär dennoch gerechtfertigt sein. Allerdings muss sie so gestaltet werden, dass sie die Anreize für den Wohnungsbau nicht beschneidet.On June 1, 2016, the much-discussed rental brake will have been in force for exactly one year. Since then, the rental brake has been implemented in 308 German cities. Prior fears that it would hamper urgently needed construction activity have not materialized, neither have hopes that the new regulations would allow low earners an improved access to the housing market. However, a purely descriptive analysis of the available data is not sufficient to properly assess the impact of rent regulations. Therefore, the present study examines how rents would have changed if no regulations had been in place and to what extent investors would have seen their expected earnings affected by the regulations. Housing rents and prices were analyzed by concentrating at the postal code districts, where the rental brake had been introduced, and the adjacent postal code districts, where the market remains unregulated. The findings of this differencein- differences approach suggest that the rental brake has not slowed the increase in rents. On the contrary, in the short term, it actually led to greater rent hikes in the regulated markets. Even investors seem to be of the opinion that the regulations will have no substantial effect in the future: the causal effects of the rental brake on the development of housing prices-as a reflection of future rental income-are relatively small. In order to provide a sustainable solution to the housing shortage, priority should be given to measures that stimulate an expansion of construction activity and make the housing supply more flexible. From a social policy point of view, a temporary rental brake can still be justified. It must, however, be structured in such a way that it does not restrict incentives for housing construction in the future

Market break or simply fake? Empirics on the causal effects of rent controls in Germany

Rising rents in German cities have led to an intense debate about the need for tighter rent controls in housing markets. In April 2015, the so-called rental brake was introduced, which imposes upper bounds for rents in new contracts, in order to immediately slow down the increase of rents in tight housing markets. Since then, 11 federal states made use of this instrument. We take advantage of this intra-country variation and test whether the regulation had a causal effect on rents and house prices in the short run. We apply a standard difference-in-differences setup that allows us to study the effects of the rental brake on the underlying price trend in neighboring treated and non-treated postal-code districts. We ground our analysis on a large sample of online advertised rental dwellings and find that, contrary to the expectations of the policy makers, the rental brake has, at best, no impact in the short run. At worst, it even accelerates rent increases both in municipalities subject to the rental brake and in neighboring areas. We further conclude, based on our estimates on the development of at prices, that investors expect on little impact on future rental income

Densities and phase equilibria of hydrogen, propane and vegetable oil mixtures. Experimental data and thermodynamic modeling

Heterogeneous catalytic gas-liquid reactions are intensified when carried out in the homogenous fluid phase by means of a supercritical co-solvent. For instance, supercritical propane is used to enhance yield in the hydrogenation of vegetable oils. Besides phase equilibrium knowledge, volumetric information is also needed to elucidate kinetic mechanisms and design continuous supercritical reactors. In this work, we report new experimental PvT data of the reactive mixture H2+sunflower oil+propane using the isochoric method. In addition, the phase equilibria and PvT data are modeled with the GCA and RK-PR equations of state, respectively. The isochoric method not only provides PvT information under the reaction conditions, but also the reactive system compressibility, key variable to attain enhanced transport properties in the supercritical reactors.Fil: Hegel, Pablo Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Cotabarren, Natalia Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Brignole, Esteban Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Pereda, Selva. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina. University of KwaZulu-Natal; Sudáfric