TY - JOUR A1 - Purinton, Benjamin A1 - Bookhagen, Bodo T1 - Validation of digital elevation models (DEMs) and comparison of geomorphic metrics on the southern Central Andean Plateau JF - Earth surface dynamics N2 - In this study, we validate and compare elevation accuracy and geomorphic metrics of satellite-derived digital elevation models (DEMs) on the southern Central Andean Plateau. The plateau has an average elevation of 3.7 km and is characterized by diverse topography and relief, lack of vegetation, and clear skies that create ideal conditions for remote sensing. At 30m resolution, SRTM-C, ASTER GDEM2, stacked ASTER L1A stereopair DEM, ALOS World 3D, and TanDEM-X have been analyzed. The higher-resolution datasets include 12m TanDEM-X, 10m single-CoSSC TerraSAR-X/TanDEM-X DEMs, and 5m ALOS World 3D. These DEMs are state of the art for optical (ASTER and ALOS) and radar (SRTM-C and TanDEM-X) spaceborne sensors. We assessed vertical accuracy by comparing standard deviations of the DEM elevation versus 307 509 differential GPS measurements across 4000m of elevation. For the 30m DEMs, the ASTER datasets had the highest vertical standard deviation at > 6.5 m, whereas the SRTM-C, ALOS World 3D, and TanDEM-X were all < 3.5 m. Higher-resolution DEMs generally had lower uncertainty, with both the 12m TanDEM-X and 5m ALOSWorld 3D having < 2m vertical standard deviation. Analysis of vertical uncertainty with respect to terrain elevation, slope, and aspect revealed the low uncertainty across these attributes for SRTM-C (30 m), TanDEM-X (12–30 m), and ALOS World 3D (5–30 m). Single-CoSSC TerraSAR-X/TanDEM-X 10m DEMs and the 30m ASTER GDEM2 displayed slight aspect biases, which were removed in their stacked counterparts (TanDEM-X and ASTER Stack). Based on low vertical standard deviations and visual inspection alongside optical satellite data, we selected the 30m SRTM-C, 12–30m TanDEM-X, 10m single-CoSSC TerraSAR-X/TanDEM-X, and 5m ALOS World 3D for geomorphic metric comparison in a 66 km2 catchment with a distinct river knickpoint. Consistent m=n values were found using chi plot channel profile analysis, regardless of DEM type and spatial resolution. Slope, curvature, and drainage area were calculated and plotting schemes were used to assess basin-wide differences in the hillslope-to-valley transition related to the knickpoint. While slope and hillslope length measurements vary little between datasets, curvature displays higher magnitude measurements with fining resolution. This is especially true for the optical 5m ALOS World 3D DEM, which demonstrated high-frequency noise in 2–8 pixel steps through a Fourier frequency analysis. The improvements in accurate space-radar DEMs (e.g., TanDEM-X) for geomorphometry are promising, but airborne or terrestrial data are still necessary for meter-scale analysis. Y1 - 2017 U6 - https://doi.org/10.5194/esurf-5-211-2017 SN - 2196-632X SN - 2196-6311 VL - 5 IS - 2 SP - 211 EP - 237 PB - Copernicus Publ. CY - Göttingen ER - TY - JOUR A1 - Purinton, Benjamin A1 - Bookhagen, Bodo T1 - Validation of digital elevation models (DEMs) and comparison of geomorphic metrics on the southern Central Andean Plateau JF - Earth surface dynamics N2 - In this study, we validate and compare elevation accuracy and geomorphic metrics of satellite-derived digital elevation models (DEMs) on the southern Central Andean Plateau. The plateau has an average elevation of 3.7 km and is characterized by diverse topography and relief, lack of vegetation, and clear skies that create ideal conditions for remote sensing. At 30m resolution, SRTM-C, ASTER GDEM2, stacked ASTER L1A stereopair DEM, ALOS World 3D, and TanDEM-X have been analyzed. The higher-resolution datasets include 12m TanDEM-X, 10m single-CoSSC TerraSAR-X/TanDEM-X DEMs, and 5m ALOS World 3D. These DEMs are state of the art for optical (ASTER and ALOS) and radar (SRTM-C and TanDEM-X) spaceborne sensors. We assessed vertical accuracy by comparing standard deviations of the DEM elevation versus 307 509 differential GPS measurements across 4000m of elevation. For the 30m DEMs, the ASTER datasets had the highest vertical standard deviation at > 6.5 m, whereas the SRTM-C, ALOS World 3D, and TanDEM-X were all < 3.5 m. Higher-resolution DEMs generally had lower uncertainty, with both the 12m TanDEM-X and 5m ALOSWorld 3D having < 2m vertical standard deviation. Analysis of vertical uncertainty with respect to terrain elevation, slope, and aspect revealed the low uncertainty across these attributes for SRTM-C (30 m), TanDEM-X (12-30 m), and ALOS World 3D (5-30 m). Single-CoSSC TerraSAR-X/TanDEM-X 10m DEMs and the 30m ASTER GDEM2 displayed slight aspect biases, which were removed in their stacked counterparts (TanDEM-X and ASTER Stack). Based on low vertical standard deviations and visual inspection alongside optical satellite data, we selected the 30m SRTM-C, 12-30m TanDEM-X, 10m single-CoSSC TerraSAR-X/TanDEM-X, and 5m ALOS World 3D for geomorphic metric comparison in a 66 km2 catchment with a distinct river knickpoint. Consistent m = n values were found using chi plot channel profile analysis, regardless of DEM type and spatial resolution. Slope, curvature, and drainage area were calculated and plotting schemes were used to assess basin-wide differences in the hillslope-to-valley transition related to the knickpoint. While slope and hillslope length measurements vary little between datasets, curvature displays higher magnitude measurements with fining resolution. This is especially true for the optical 5m ALOS World 3D DEM, which demonstrated high-frequency noise in 2-8 pixel steps through a Fourier frequency analysis. The improvements in accurate space-radar DEMs (e. g., TanDEM-X) for geomorphometry are promising, but airborne or terrestrial data are still necessary for meter-scale analysis. Y1 - 2017 U6 - https://doi.org/10.5194/esurf-5-211-2017 SN - 2196-6311 SN - 2196-632X VL - 5 SP - 211 EP - 237 PB - Copernicus CY - Göttingen ER - TY - GEN A1 - Raila, Jens A1 - Kawashima, Chiho A1 - Sauerwein, Helga A1 - Hülsmann, Nadine A1 - Knorr, Christoph A1 - Myamoto, Akio A1 - Schweigert, Florian J. T1 - Validation of blood vitamin A concentrations in cattle: comparison of a new cow-side test (iCheck™ FLUORO) with high-performance liquid chromatography (HPLC) N2 - Background: Plasma concentration of retinol is an accepted indicator to assess the vitamin A (retinol) status in cattle. However, the determination of vitamin A requires a time consuming multi-step procedure, which needs specific equipment to perform extraction, centrifugation or saponification prior to high-performance liquid chromatography (HPLC). Methods: The concentrations of retinol in whole blood (n = 10), plasma (n = 132) and serum (n = 61) were measured by a new rapid cow-side test (iCheck™ FLUORO) and compared with those by HPLC in two independent laboratories in Germany (DE) and Japan (JP). Results: Retinol concentrations in plasma ranged from 0.033 to 0.532 mg/L, and in serum from 0.043 to 0.360 mg/L (HPLC method). No significant differences in retinol levels were observed between the new rapid cow-side test and HPLC performed in different laboratories (HPLC vs. iCheck™ FLUORO: 0.320 ± 0.047 mg/L vs. 0.333 ± 0.044 mg/L, and 0.240 ± 0.096 mg/L vs. 0.241 ± 0.069 mg/L, lab DE and lab JP, respectively). A similar comparability was observed when whole blood was used (HPLC vs. iCheck™ FLUORO: 0.353 ± 0.084 mg/L vs. 0.341 ± 0.064 mg/L). Results showed a good agreement between both methods based on correlation coefficients of r2 = 0.87 (P < 0.001) and Bland-Altman blots revealed no significant bias for all comparison. Conclusions: With the new rapid cow-side test (iCheck™ FLUORO) retinol concentrations in cattle can be reliably assessed within a few minutes and directly in the barn using even whole blood without the necessity of prior centrifugation. The ease of the application of the new rapid cow-side test and its portability can improve the diagnostic of vitamin A status and will help to control vitamin A supplementation in specific vitamin A feeding regimes such as used to optimize health status in calves or meat marbling in Japanese Black cattle. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 381 KW - Biomarker KW - Blood KW - Cattle KW - Cow-side assay KW - Method comparison KW - Vitamin A Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-401978 ER - TY - JOUR A1 - Raila, Jens A1 - Kawashima, Chiho A1 - Sauerwein, Helga A1 - Hülsmann, Nadine A1 - Knorr, Christoph A1 - Myamoto, Akio A1 - Schweigert, Florian J. T1 - Validation of blood vitamin A concentrations in cattle: comparison of a new cow-side test (iCheck™ FLUORO) with high-performance liquid chromatography (HPLC) JF - BMC veterinary research N2 - Background: Plasma concentration of retinol is an accepted indicator to assess the vitamin A (retinol) status in cattle. However, the determination of vitamin A requires a time consuming multi-step procedure, which needs specific equipment to perform extraction, centrifugation or saponification prior to high-performance liquid chromatography (HPLC). Methods: The concentrations of retinol in whole blood (n = 10), plasma (n = 132) and serum (n = 61) were measured by a new rapid cow-side test (iCheck™ FLUORO) and compared with those by HPLC in two independent laboratories in Germany (DE) and Japan (JP). Results: Retinol concentrations in plasma ranged from 0.033 to 0.532 mg/L, and in serum from 0.043 to 0.360 mg/L (HPLC method). No significant differences in retinol levels were observed between the new rapid cow-side test and HPLC performed in different laboratories (HPLC vs. iCheck™ FLUORO: 0.320 ± 0.047 mg/L vs. 0.333 ± 0.044 mg/L, and 0.240 ± 0.096 mg/L vs. 0.241 ± 0.069 mg/L, lab DE and lab JP, respectively). A similar comparability was observed when whole blood was used (HPLC vs. iCheck™ FLUORO: 0.353 ± 0.084 mg/L vs. 0.341 ± 0.064 mg/L). Results showed a good agreement between both methods based on correlation coefficients of r2 = 0.87 (P < 0.001) and Bland-Altman blots revealed no significant bias for all comparison. Conclusions: With the new rapid cow-side test (iCheck™ FLUORO) retinol concentrations in cattle can be reliably assessed within a few minutes and directly in the barn using even whole blood without the necessity of prior centrifugation. The ease of the application of the new rapid cow-side test and its portability can improve the diagnostic of vitamin A status and will help to control vitamin A supplementation in specific vitamin A feeding regimes such as used to optimize health status in calves or meat marbling in Japanese Black cattle. KW - Cattle KW - Vitamin A KW - Biomarker KW - Blood KW - Method comparison KW - Cow-side assay Y1 - 2017 U6 - https://doi.org/10.1186/s12917-017-1042-3 VL - 13 PB - BioMed Central CY - London ER - TY - THES A1 - Stadion, Mandy T1 - Validation and Characterization of lfi202b and Zfp69, two Novel Disease Genes in Obesity-Associated Insulin Resistance Y1 - 2017 ER - TY - JOUR A1 - Eckert, Sebastian A1 - Niskanen, Johannes A1 - Jay, Raphael Martin A1 - Miedema, Piter S. A1 - Fondell, Mattis A1 - Kennedy, Brian A1 - Quevedo, Wilson A1 - Iannuzzi, Marcella A1 - Föhlisch, Alexander T1 - Valence orbitals and local bond dynamics around N atoms of histidine under X-ray irradiation JF - Physical chemistry, chemical physics : a journal of European Chemical Societies N2 - The valence orbitals of aqueous histidine under basic, neutral and acidic conditions and their X-ray induced transformations have been monitored through N 1s resonant inelastic X-ray scattering. Using density functional ab initio molecular dynamics simulations in the core-hole state within the Z + 1 approximation, core-excitation-induced molecular transformations are quantified. Spectroscopic evidence for a highly directional X-ray-induced local N-H dissociation within the scattering duration is presented for acidic histidine. Our report demonstrates a protonation-state and chemical-environment dependent propensity for a molecular dissociation, which is induced by the absorption of high energy photons. This case study indicates that structural deformations in biomolecules under exposure to ionizing radiation, yielding possible alteration or loss of function, is highly dependent on the physiological state of the molecule upon irradiation. Y1 - 2017 U6 - https://doi.org/10.1039/c7cp05713j SN - 1463-9076 SN - 1463-9084 VL - 19 SP - 32091 EP - 32098 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Zhong, Qi A1 - Metwalli, Ezzeldin A1 - Rawolle, Monika A1 - Kaune, Gunar A1 - Bivigou Koumba, Achille Mayelle A1 - Laschewsky, Andre A1 - Papadakis, Christine M. A1 - Cubitt, Robert A1 - Wang, Jiping A1 - Müller-Buschbaum, Peter T1 - Vacuum induced dehydration of swollen poly(methoxy diethylene glycol acrylate) and polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene films probed by in-situ neutron reflectivity JF - Polymer : the international journal for the science and technology of polymers N2 - The isothermal vacuum-induced dehydration of thin films made of poly(methoxy diethylene glycol acrylate) (PMDEGA), which were swollen under ambient conditions, is studied. The dehydration behavior of the homopolymer film as well as of a nanostructured film of the amphiphilic triblock copolymer polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene, abbreviated as PS-b-PMDEGA-b-PS, are probed, and compared to the thermally induced dehydration behavior of such thin thermo-responsive films when they pass through their LCST-type coil-to globule collapse transition. The dehydration kinetics is followed by in-situ neutron reflectivity measurements. Contrast results from the use of deuterated water. Water content and film thickness are significantly reduced during the process, which can be explained by Schott second order kinetics theory for both films. The water content of the dehydrated equilibrium state from this model is very close to the residual water content obtained from the final static measurements, indicating that residual water still remains in the film even after prolonged exposure to the vacuum. In the PS-b-PMDEGA-b-PS film that shows micro-phase separation, the hydrophobic PS domains modify the dehydration process by hindering the water removal, and thus retarding dehydration by about 30%. Whereas residual water remains tightly bound in the PMDEGA domains, water is completely removed from the PS domains of the block copolymer film. (C) 2017 Elsevier Ltd. All rights reserved. KW - Dehydration KW - Vacuum drying KW - In-situ neutron reflectivity Y1 - 2017 U6 - https://doi.org/10.1016/j.polymer.2017.07.066 SN - 0032-3861 SN - 1873-2291 VL - 124 SP - 263 EP - 273 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Derras, Boumediene A1 - Bard, Pierre-Yves A1 - Cotton, Fabrice T1 - V-S30, slope, H-800 and f(0): performance of various site-condition proxies in reducing ground-motion aleatory variability and predicting nonlinear site response JF - Earth, planets and space N2 - The aim of this paper is to investigate the ability of various site-condition proxies (SCPs) to reduce ground-motion aleatory variability and evaluate how SCPs capture nonlinearity site effects. The SCPs used here are time-averaged shear-wave velocity in the top 30 m (V-S30), the topographical slope (slope), the fundamental resonance frequency (f(0)) and the depth beyond which V-s exceeds 800 m/s (H800). We considered first the performance of each SCP taken alone and then the combined performance of the 6 SCP pairs [V-S30-f(0)], [V-S30-H-800], [f(0)-slope], [H-800-slope], [V-S30-slope] and [f(0)-H-800]. This analysis is performed using a neural network approach including a random effect applied on a KiK-net subset for derivation of ground-motion prediction equations setting the relationship between various ground-motion parameters such as peak ground acceleration, peak ground velocity and pseudo-spectral acceleration PSA (T), and Mw, RJB, focal depth and SCPs. While the choice of SCP is found to have almost no impact on the median groundmotion prediction, it does impact the level of aleatory uncertainty. VS30 is found to perform the best of single proxies at short periods (T < 0.6 s), while f(0) and H-800 perform better at longer periods; considering SCP pairs leads to significant improvements, with particular emphasis on [V-S30-H-800] and [f(0)-slope] pairs. The results also indicate significant nonlinearity on the site terms for soft sites and that the most relevant loading parameter for characterising nonlinear site response is the "stiff" spectral ordinate at the considered period. KW - Aleatory variability KW - Site-condition proxies KW - KiK-net KW - Neural networks KW - GMPE KW - Nonlinear site response Y1 - 2017 U6 - https://doi.org/10.1186/s40623-017-0718-z SN - 1880-5981 VL - 69 SP - 1623 EP - 1629 PB - Springer CY - Heidelberg ER - TY - JOUR A1 - Lenski, Anna Eva A1 - Richter, Dirk A1 - Lüdtke, Oliver T1 - Using the theory of planned behavior to predict teachers’ likelihood of taking a competency-based approach to instruction JF - European Journal of Psychology of Education N2 - Quality of mathematics education has gained significant attention in educational politics and among educators as mathematics advances the foundations of analytical thinking necessary to excel in today’s knowledge-based economy. Recent research on instructional quality has focused on students’ development of competencies. Competency-based instruction is believed to be an effective approach to instruction as it is closely aligned to educational standards. We use data from the National Assessment Study 2012 in Germany and apply the theory of planned behavior to determine what motivates mathematics teachers (n = 1660) to take a competency-based approach to instruction. Results indicate that competencies outlined in the educational standards are a tangible element of current mathematics instruction. Within the framework of this study, we identified teachers’ perceived behavior control as the strongest determinant of taking a competency-based approach to instruction. We conclude that advancement of competency-based instruction depends on teachers’ beliefs about their professional resources. KW - Instructional quality KW - Educational standards KW - Mathematics instruction KW - Large-scale assessment KW - Theory of planned behavior Y1 - 2017 U6 - https://doi.org/10.1007/s10212-017-0356-7 SN - 0256-2928 SN - 1878-5174 VL - 34 IS - 1 SP - 169 EP - 186 PB - Springer CY - New York ER - TY - JOUR A1 - Siemer, Julia T1 - Using Statistics Canada Data To Map Canada´s Population JF - Potsdamer Geographische Praxis N2 - Statistics Canada, Kanada’s nationale Statistikbehörde, bietet eine Reihe räumlicher Basisdaten zur Kartenerstellung und räumlichen Analyse ihrer Bevölkerungsdaten an. Der folgende Bericht zeigt die Möglichkeiten und Einschränkung der angebotenen räumlichen Daten für die Bevölkerungskartographie auf und stellt die vorhandenen Verwaltungsgrenzdateien bis zur kleinsten Einheit, dem so genannten ‚dissemination block‘, in ihrer Struktur vor. Die räumlich sehr ungleiche Verteilung der Bevölkerung Kanadas stellt eine besondere Herausforderung bei der kartographischen Visualisierung dar. Üblicherweise angewendete Methoden wie die Choroplethen-Methode sind im Falle Kanadas streng genommen nur zur Visualisierung kleinräumiger Bevölkerungsdichte geeignet. Um die Darstellung der Bevölkerungsdichte und -verteilung auch für größere Raumeinheiten, z. B. den so genannten ‚census divisions‘ oder die Provinzen, zu ermöglichen, veröffentlicht Statistics Canada einen Datensatz, der die Abgrenzung der Ökumene, also der bewohnten Fläche, des Landes veranschaulicht. Diese Datei ermöglicht es dem Nutzer die Bevölkerungsdichte und -verteilung des Landes angemessen und detailliert zu visualisieren. N2 - Statistics Canada, Canada’s national statistics agency, offers a suite of spatial files for mapping and analysis of its various population data products. The following article showcases possibilities and shortfalls of the existing spatial files for mapping population data, and provides an overview of the structure of the available boundary files from the regional to the dissemination block level. Due to Canada’s highly dispersed population, mapping its distribution and density can be challenging. Common mapping techniques such as the choropleth method are suitable only for mapping spatially high resolution data such as data at the dissemination area level. To allow for mapping of population data at less detailed levels such as census divisions or provinces, Statistics Canada has created a so-called ecumene boundary file which outlines the inhabited area of Canada and can be used to more accurately visualize Canada’s population distribution and density. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103439 SN - 978-3-86956-389-3 SN - 2194–1599 SN - 2194–1602 IS - 12 SP - 35 EP - 49 PB - Universitätsverlag Potsdam CY - Potsdam ER -