TY  - CHAP
A1  - Poth, Sebastian
A1  - Monzon, Magaly
A1  - Tippkötter, Nils
A1  - Ulber, Roland
T1  - Lignocellulosic biorefinery : process integration of hydrolysis and fermentation
T2  - Proceedings / 11th European Workshop on Lignocellulosics and Pulp : August 16 - 19, 2010, Hamburg, Germany
Y1  - 2010
SP  - 65
EP  - 68
PB  - vTi
CY  - Hamburg
ER  - 
TY  - JOUR
A1  - Pourshahidi, Ali Mohammad
A1  - Achtsnicht, Stefan
A1  - Nambipareechee, Mrinal Murali
A1  - Offenhäusser, Andreas
A1  - Krause, Hans-Joachim
T1  - Multiplex detection of magnetic beads using offset field dependent frequency mixing magnetic detection
JF  - Sensors
N2  - Magnetic immunoassays employing Frequency Mixing Magnetic Detection (FMMD) have recently become increasingly popular for quantitative detection of various analytes. Simultaneous analysis of a sample for two or more targets is desirable in order to reduce the sample amount, save consumables, and save time. We show that different types of magnetic beads can be distinguished according to their frequency mixing response to a two-frequency magnetic excitation at different static magnetic offset fields. We recorded the offset field dependent FMMD response of two different particle types at frequencies ƒ₁ + n⋅ƒ₂, n = 1, 2, 3, 4 with ƒ₁ = 30.8 kHz and ƒ₂ = 63 Hz. Their signals were clearly distinguishable by the locations of the extremes and zeros of their responses. Binary mixtures of the two particle types were prepared with different mixing ratios. The mixture samples were analyzed by determining the best linear combination of the two pure constituents that best resembled the measured signals of the mixtures. Using a quadratic programming algorithm, the mixing ratios could be determined with an accuracy of greater than 14%. If each particle type is functionalized with a different antibody, multiplex detection of two different analytes becomes feasible.
KW  - colorization
KW  - multiplex detection
KW  - frequency mixing magnetic detection
KW  - magnetic nanoparticles
Y1  - 2021
U6  - https://doi.org/10.3390/s21175859
SN  - 1424-8220
N1  - This article belongs to the Special Issue "Advanced Nanomaterial-Based Sensors for Biomedical Applications"
VL  - 21
IS  - 17
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Pourshahidi, Ali Mohammad
A1  - Achtsnicht, Stefan
A1  - Offenhäusser, Andreas
A1  - Krause, Hans-Joachim
ED  - Offenhäusser, Andreas
T1  - Frequency Mixing Magnetic Detection Setup Employing Permanent Ring Magnets as a Static Offset Field Source
JF  - Sensors
N2  - Frequency mixing magnetic detection (FMMD) has been explored for its applications in fields of magnetic biosensing, multiplex detection of magnetic nanoparticles (MNP) and the determination of core size distribution of MNP samples. Such applications rely on the application of a static offset magnetic field, which is generated traditionally with an electromagnet. Such a setup requires a current source, as well as passive or active cooling strategies, which directly sets a limitation based on the portability aspect that is desired for point of care (POC) monitoring applications. In this work, a measurement head is introduced that involves the utilization of two ring-shaped permanent magnets to generate a static offset magnetic field. A steel cylinder in the ring bores homogenizes the field. By variation of the distance between the ring magnets and of the thickness of the steel cylinder, the magnitude of the magnetic field at the sample position can be adjusted. Furthermore, the measurement setup is compared to the electromagnet offset module based on measured signals and temperature behavior.
KW  - magnetic sensors
KW  - biosensors
KW  - frequency mixing magnetic detection
KW  - magnetic nanoparticles
Y1  - 2022
U6  - https://doi.org/10.3390/s22228776
SN  - 1424-8220
VL  - 22
IS  - 22
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Pourshahidi, Ali Mohammad
A1  - Engelmann, Ulrich M.
A1  - Offenhäusser, Andreas
A1  - Krause, Hans-Joachim
T1  - Resolving ambiguities in core size determination of magnetic nanoparticles from magnetic frequency mixing data
JF  - Journal of Magnetism and Magnetic Materials
N2  - Frequency mixing magnetic detection (FMMD) has been widely utilized as a measurement technique in magnetic immunoassays. It can also be used for the characterization and distinction (also known as “colourization”) of different types of magnetic nanoparticles (MNPs) based on their core sizes. In a previous work, it was shown that the large particles contribute most of the FMMD signal. This leads to ambiguities in core size determination from fitting since the contribution of the small-sized particles is almost undetectable among the strong responses from the large ones. In this work, we report on how this ambiguity can be overcome by modelling the signal intensity using the Langevin model in thermodynamic equilibrium including a lognormal core size distribution fL(dc,d0,σ) fitted to experimentally measured FMMD data of immobilized MNPs. For each given median diameter d0, an ambiguous amount of best-fitting pairs of parameters distribution width σ and number of particles Np with R2 > 0.99 are extracted. By determining the samples’ total iron mass, mFe, with inductively coupled plasma optical emission spectrometry (ICP-OES), we are then able to identify the one specific best-fitting pair (σ, Np) one uniquely. With this additional externally measured parameter, we resolved the ambiguity in core size distribution and determined the parameters (d0, σ, Np) directly from FMMD measurements, allowing precise MNPs sample characterization.
Y1  - 2022
U6  - https://doi.org/10.1016/j.jmmm.2022.169969
SN  - 0304-8853
VL  - 563
IS  - In progress, Art. No. 169969
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Preiß, C.
A1  - Linder, Peter
A1  - Wendt, K.
A1  - Krystek, M.
A1  - Digel, Ilya
A1  - Gossmann, Matthias
A1  - Temiz Artmann, Aysegül
A1  - Porst, Dariusz
A1  - Kayser, Peter
A1  - Bassam, Rasha
A1  - Artmann, Gerhard
T1  - Engineering technology for plant physiology and plant stress research
N2  - Plant physiology and plant stress: Plant physiology will be much more important for human mankind because of yield and cultivation limits of crops determined by their resistance to stress. To assess and counteract various stress factors it is necessary to conduct plant research to gain information and results on plant physiology.
KW  - Pflanzenphysiologie
KW  - Pflanzenstress
KW  - Pflanzenscanner
KW  - plant stress
KW  - plant scanner
Y1  - 2011
ER  - 
TY  - JOUR
A1  - Pressler, Axel
A1  - Esefeld, Katrin
A1  - Scherr, Johannes
A1  - Ali, Mohammad
A1  - Hanssen, Henner
A1  - Kotliar, Konstantin
A1  - Lanzl, Ines
A1  - Halle, Martin
A1  - Kaemmerer, Harald
A1  - Schmidt-Trucksäss, Arno
A1  - Hager, Alfred
T1  - Structural alterations of retinal arterioles in adults late after repair of aortic isthmic coarctation
JF  - The American Journal of Cardiology
N2  - Patients after coarctation repair still have an increased risk of cardiovascular or cerebrovascular events. This has been explained by the persisting hypertension and alterations in the peripheral vessels. However, involvement of the central vessels such as the retinal arteries is virtually unknown. A total of 34 patients after coarctation repair (22 men and 12 women; 23 to 58 years old, age range 0 to 32 years at surgical repair) and 34 nonhypertensive controls underwent structural and functional retinal vessel analysis. Using structural analysis, the vessel diameters were measured. Using functional analysis, the endothelium-dependent vessel dilation in response to flicker light stimulation was assessed. In the patients after coarctation repair, the retinal arteriolar diameter was significantly reduced compared to that of the controls (median 182 μm, first to third quartile 171 to 197; vs 197 μm, first to third quartile 193 to 206; p <0.001). These findings were independent of the peripheral blood pressure and age at intervention. No differences were found for venules. The functional analysis findings were not different between the patients and controls (maximum dilation 3.5%, first to third quartile 2.1% to 4.5% vs 3.6%, first to third quartile 2.2% to 4.3%; p = 0.81), indicating preserved autoregulative mechanisms. In conclusion, the retinal artery diameter is reduced in patients after coarctation repair, independent of their current blood pressure level and age at intervention. As a structural marker of chronic vessel damage associated with past, current, or future hypertension, retinal arteriolar narrowing has been linked to stroke incidence. These results indicate an involvement of cerebral microcirculation in aortic coarctation, despite timely repair, and might contribute to explain the increased rate of cerebrovascular events in such patients.
Y1  - 2010
U6  - https://doi.org/10.1016/j.amjcard.2009.10.070
SN  - 0002-9149
VL  - 105
IS  - 5
SP  - 740
EP  - 744
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Pricking, Sebastian
A1  - Gebs, Raphael
A1  - Fleischhaker, Robert
A1  - Kleinbauer, Jochen
A1  - Budnicki, Aleksander
A1  - Sutter, Dirk
A1  - Killi, Alexander
A1  - Weiler, Sascha
A1  - Mielke, M.
A1  - Beaudou, B.
A1  - Debord, B.
A1  - Gerome, F.
A1  - Benabid, F.
ED  - Dorsch, Friedhelm
T1  - Hollow core fiber delivery of sub-ps pulses from a TruMicro 5000 Femto edition thin disk amplifier
T2  - High-power laser materials processing: Lasers, beam delivery, diagnostics, and applications IV : 7 Februar 2015, San Francisco, USA. - (SPIE proceedings series ; 9356)
Y1  - 2015
SN  - 978-162841446-2
U6  - https://doi.org/10.1117/12.2079289
SN  - 0277-786X
SP  - 935602
PB  - SPIE, International Society for Optical Engineering
ER  - 
TY  - CHAP
A1  - Priede, Gareth
A1  - Ferrein, Alexander
T1  - Towards passive walking for the fully-actuated biped robot Nao
T2  - Emerging trends in computing, informatics, systems sciences, and engineering. (Lecture notes in electrical engineering : vol. 151)
N2  - Many biped robots deploy a form of gait that follows the zero moment point (ZMP) approach, that is, the robot is in a stable position at any point in time. This requires the robot to be fully actuated. While very stable, the draw-backs of this approach are a fairly slow gait and high energy consumption. An alternative approach is the so-called passive-dynamic walking, where the gait makes use of the inertia and dynamic stability of the robot. In this paper we describe our ongoing work of combining the principles of passive-dynamic walking on the fully-actuated biped robot Nao, which is also deployed for robotic soccer applications. We present a simple controller that allows the robot to stably rock sidewards, showing a closed limit-cycle. We discuss first results of superimposing a forward motion on the sidewards motion. Based on this we expect to endow the Nao with a fast, robust, and stable passive-dynamic walk on the fully-actuated Nao in the future.
Y1  - 2013
SN  - 978-1-4614-3557-0 ; 978-1-4614-3558-7
U6  - https://doi.org/10.1007/978-1-4614-3558-7_18
SP  - 225
EP  - 236
PB  - Springer
CY  - New York, NY
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Hörstermann, D.
A1  - Gyngell, M. L.
A1  - Merboldt, K.-D.
T1  - Localized Proton MRS of Acute and Chronic Gyperglycemia in Rat Brain in vivo / D. Hörstermann, F. Prielmeier , M. L. Gyngell, K.-D. Merboldt, W. Hänicke, J. Frahm
JF  - Book of Abstracts, SMRM, 11th Annual Meeting Berlin
Y1  - 1992
N1  - Society of Magnetic Resonance in Medicine
SP  - 2740
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lang, E. W.
T1  - Multinuclear Spin-Lattice Relaxation Time Studies of Supercooled Aqueous LiCl-Solutions / E .W. Lang, F. X. Prielmeier
JF  - Berichte der Bunsen-Gesellschaft für Physikalische Chemie. 92 (1988)
Y1  - 1988
SN  - 0005-9021
SP  - 717
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lang, E. W.
A1  - Lüdemann, H.-D.
T1  - Pressure dependence of the self-diffusion in liquid trifluoromethane / F. X. Prielmeier; E. W. Lang; H.-D. Lüdemann
JF  - Molecular Physics. 52 (1984), H. 5
Y1  - 1984
SN  - 0026-8976
SP  - 1105
EP  - 1113
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lang, E. W.
A1  - Radkowitsch, H.
A1  - Lüdemann, H. D.
T1  - High Pressure NMR Study of the Molecular Dynamics of Liquid fluoroform and deutero-fluoroform / Lang, E. W. ; Prielmeier, F. X. ; Radkowitsch, H. ; Lüdemann, H. D.
JF  - Berichte der Bunsen-Gesellschaft für Physikalische Chemie. 91 (1987), H. 10
Y1  - 1987
SN  - 0005-9021
SP  - 1025
EP  - 1033
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lang, E. W.
A1  - Radkowitsch, H.
A1  - Lüdemann, H.-D.
T1  - High Pressure NMR Study of the Molecular Dynamics of Liquid methyl fluoride and deutero-methyl fluoride / Lang, E. W. ; Prielmeier, F. X. ; Radkowitsch, H. ; Lüdemann, H. D.
JF  - Berichte der Bunsen-Gesellschaft für Physikalische Chemie. 91 (1987), H. 10
Y1  - 1987
SN  - 0005-9021
SP  - 1017
EP  - 1025
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lang, E. W.
A1  - Speedy, R. J.
A1  - Lüdemann, H.-D.
T1  - The pressure Dependence of Self Diffusion in Supercooled Light and Heavy Water / F.X. Prielmeier, E .W. Lang, R. J. Speedy, H.-D. Lüdemann
JF  - Berichte der Bunsen-Gesellschaft für Physikalische Chemie. 92 (1988)
Y1  - 1988
SN  - 0005-9021
SP  - 1111
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lang, E. W.
A1  - Speedy, R. J.
A1  - Lüdemann, H.-D.
T1  - Diffusion in supercooled water to 300 MPa
JF  - Physical Review Letters. 59 (1987), H. 10
Y1  - 1987
SN  - 0031-9007
SP  - 1128
EP  - 1131
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Lüdemann, H.-D.
T1  - Self diffusion in compressed liquid chloromethane, dichloromethane and trichloromethane / F. X. Prielmeier; H.-D. Lüdemann
JF  - Molecular Physics. 58 (1986), H. 3
Y1  - 1986
SN  - 0026-8976
SP  - 593
EP  - 604
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Merboldt, K. D.
A1  - Hanicke, W.
A1  - Frahm, J.
T1  - Dynamic high-resolution MR imaging of brain deoxygenation during transient anoxia in the anesthetized rat
JF  - Journal of cerebral blood flow and metabolism. 13 (1993), H. 5
Y1  - 1993
SN  - 0271-678X
SP  - 889
EP  - 894
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Nagatomo, Yasushi
A1  - Frahm, Jens
T1  - Cerebral blood oxygenation in rat brain during hypoxic hypoxia. Quantitative MRI of effective transverse relaxation rates
JF  - Magnetic Resonance in Medicine. 31 (1994), H. 6
Y1  - 1994
SN  - 0740-3194
SP  - 678
EP  - 681
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Nagatomo, Yasushi
A1  - Wick, Markus
A1  - Frahm, Jens
T1  - Dynamic monitoring of cerebral metabolites during and after transient global ischemia in rats by quantitative proton NMR spectroscopy in vivo / Yasushi Nagatomo, Markus Wick, Franz Prielmeier, Jens Frahm
JF  - NMR in Biomedicine. 8 (1995), H. 6
Y1  - 1995
SN  - 1099-1492
SP  - 265
EP  - 270
ER  - 
TY  - JOUR
A1  - Prielmeier, Franz
A1  - Radkowitsch, H.
A1  - Lang, E. W.
A1  - Lüdemann, H.-D.
T1  - Density dependence of the molecular dynamics of fluid CH3F and CF3H studied by NMR / H. Radkowitsch, F. X.  Prielmeier, E. W. Lang and H.-D. Lüdemann
JF  - Physica B+C. 139-140 (1986)
Y1  - 1986
SN  - 0921-4526
SP  - 96
EP  - 99
ER  -