In the present study a new microcosm system was evaluated for its suitability to investigate nitrogen dynamics between soils, plants and microbes. Five different agricultural soils were homogenized ...and transferred in the test tubes, and kept under controlled conditions in a climate chamber for 4weeks. Soils differed clearly in nitrogen pools and microbial population structures but less in their activities. Bacterial and fungal community compositions and soil properties, except gross N transformation rates, remained stable and reproducible during the test period in all soils. ¹⁵N tracer studies showed that N uptake patterns of barley as well as plant growth were linear in the initial growth period. Overall, the presented microcosm system proved to be a powerful tool to elucidate N pathways in soil-plant-microbe systems. In future studies the microcosm system may greatly help generating new insights in the complex processes and controls of nitrogen biogeochemical cycle in agricultural systems.
Summary
Morphological evaluation of cerebrospinal fluid (CSF) samples by light microscopy is the method of choice for the detection of central nervous system involvement in patients with ...haematological malignancies. In this retrospective study, we assessed the value of three‐colour immunophenotyping by flow cytometry in addition to conventional cytology in 28 patients with and 17 patients without pre‐existent haematological malignancy in whom CSF analysis was performed because of neurological abnormalities (n = 37) or as part of routine staging procedures (n = 8). Four samples could not be analysed by flow cytometry because of insufficient cell numbers. CSF involvement was detected in a total of 18 patients, in 12 by both cytology and flow cytometry, and in three each by either cytology or flow cytometry alone. Discordant results were particularly frequent in patients with low CSF cell numbers and B cell neoplasms. When combined with conventional cytology, flow cytometric analysis improves the detection rate of CSF involvement in patients with haematological malignancies. It is particularly useful in B cell neoplasms with low CSF cell numbers.
Tests of optical glues for the PANDA electromagnetic calorimeter Dbeyssi, A.; Tomasi-Gustafsson, E.; Hennino, T. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2013, Letnik:
722
Journal Article
Recenzirano
This paper reports on the results of tests for low temperature applications of two commercial optical glues in the electromagnetic calorimeter of PANDA at FAIR. Mechanical, thermal and optical ...properties are presented, as well as radiation hardness to photon and proton radiation.
A wideband coupled transmission line (CTL) cell to measure the operating range of an UHF RFID (ORUR) is presented. Also, an ORUR test system is proposed to increase the isolation to more than 55 dB. ...It is shown that the ORUR measured by this proposed cell agrees well with the measured data using a fully anechoic chamber.
The electromagnetic calorimeter TAPS (Two/Three Arm Photon Spectrometer) — comprising in its present set-up 384 individual plastic-BaF2 scintillator telescopes — has been constructed to identify and ...measure hard photons and neutral mesons via the reconstruction of the invariant mass from their two or three photon decay modes. Photons can be detected up to an energy of 15 GeV with high resolution (σ/E = 2.5% at 1 GeV). Neutrons and charged particles are identified by pulse-shape analysis (PSA) and time-of-flight techniques (TOF) with high efficiency. The optional modification into modular plastic/BaF2 phoswich telescopes allows improved particle spectroscopy at medium energies simultaneously.
The aim of this in vitro study was to investigate the two-body wear at the interface region between direct filling composites and substrate of CAD/CAM composites or enamel.
Two direct ...particulate-filled composites (G-aenial A’Chord & Universal Injectable) and one direct short fiber-reinforced composite (everX Flow) were placed and cured in a class I cavity cut into either CAD/CAM composites (CERASMART 270 & SFRC CAD) treated with primer (G-Multi Primer) or enamel surfaces of bovine incisors treated with an adhesive (G-Premio Bond). Two-body wear test was conducted with 15000 chewing cycles using a dual-axis chewing simulator. The specimens (n=6/per group) were positioned to produce abrasive wear (load=20N) across the interface region between direct filling composites and substrates (CAD/CAM composites and enamel). The wear pattern and depth were analyzed by a three-dimensional (3D) noncontact optical profilometer. In addition, scanning electron microscopy (SEM) was used to evaluate the wear behavior and quality of margins between the filling and substrate materials. Data were analyzed using ANOVA (p=0.05).
All restorative composites used in this investigation displayed different wear behavior (wear depth: 20-39µm) (p<0.05). The data analysis showed that the wear behavior of substrate materials depends on the filling materials used at interfaces (p<0.05). The marginal breakdown was seen only between enamel and direct filling composites.
The use of the two-body wear simulation method revealed important information about the behavior of the direct filling composites at the interface with CAD/CAD composites or enamel substrates. The marginal breakdown related to the material combination at the bonding interface region.
The PANDA experiment will be part of the future Facility for Antiproton and Ion Research (FAIR) and aims for the study of strong interaction within the charm sector via antiproton proton collisions ...up to antiproton momenta of 15 GeV/c. Reflecting the variety of the physics program the PANDA detector is designed as a multi-purpose detector able to perform tracking, calorimetry and particle identification with nearly complete coverage of the solid angle. The Electromagnetic Calorimeter (EMC) contained inside its Target Spectrometer is based on cooled PbWO4 scintillator crystals. In order to ensure an excellent performance throughout the large dynamic range of photon/electron energies ranging from a few MeV up to 15 GeV an extensive prototyping phase is mandatory. This contribution describes the measured response of the EMC barrel part prototype PROTO60 at the largest design energy to secondary beams provided by the SPS at CERN. In addition to PROTO60 a tracking station was deployed, providing precise position information of the 15 GeV/c positrons. For calibration purposes a 150 GeV/c muon beam and cosmic radiation, in combination with estimations from GEANT4 simulations were used. The obtained performance concerning energy, position and time information is presented.
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