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000017290 0247_ $$2ISSN$$a1866-1793
000017290 020__ $$a978-3-89336-719
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000017290 041__ $$aEnglish
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000017290 1001_ $$0P:(DE-Juel1)VDB70181$$aSpindler, Natascha$$b0$$eCorresponding author$$gfemale$$uFZJ
000017290 245__ $$aDiffusion and Flow Investigations innatural Porous Media by Nuclear Magnetic Resonance Imaging
000017290 260__ $$aJülich$$bFoschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2011
000017290 300__ $$aVIII, 144 S.
000017290 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis
000017290 3367_ $$0PUB:(DE-HGF)3$$2PUB:(DE-HGF)$$aBook
000017290 3367_ $$02$$2EndNote$$aThesis
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000017290 4900_ $$0PERI:(DE-600)2445288-9$$aSchriften des Forschungszentrums Jülich : Energie & Umwelt / Energy & Environment$$v112$$x1866-1793
000017290 502__ $$aRWTH Aachen, Diss., 2011$$bDr. (FH)$$cRWTH Aachen$$d2011
000017290 500__ $$3POF3_Assignment on 2016-02-29
000017290 500__ $$aRecord converted from VDB: 12.11.2012
000017290 520__ $$aClimate change and a growing global population impose severe pressure on securing the supply of nutrition to mankind. A crucial aspect thereby is the possibility to adopt the cultivation of crops to the changing climatic conditions. This is a strong motivation for being interested in root water uptake of plants. To obtain a better understanding of these mechanisms, analysis of water motion inside and towards plant roots in natural soil are essential. This work aims on the determination of water motion in natural porous media such as roots and soil using different techniques of nuclear magnetic resonance (NMR). NMR is known from medical diagnosis and allows non-invasive investigations of natural soil and intact plants. Therefore, NMR is best suited for investigating root water uptake processes. Since modeling of root water uptake processes requires an unambiguous three-dimensional reconstruction of the root skeleton, magnetic resonance imaging (MRI) is an appropriate technique for this challenge. From the spatial analysis of the answer of the sample to excitation with radio frequency (rf) pulses, the water distribution and motion inside the sample can be determined. This thesis shows how common imaging techniques introduce gaps in reconstructed roots due to susceptibility effects. To compensate for these effects, diffusion tensor imaging (DTI) was transformed to the requirements of plant roots and successfully applied for the first time. DTI is also an NMR-technique known from medical research, which detects local diffusive displacements of water molecules with high spatial resolution. Restrictions such as cell walls in plant roots limit the diffusion. If such restrictions are spatially dependent, diffusion is called anisotropic. This can be mathematically expressed by a tensor, describing the local anisotropy. DTI determines the diffusion tensors at different positions in the sample. Since DTI on plant roots shows typically a low signal to noise ratio (SNR), this work presents a new approach for data analyzing beside the common medical procedure. In the end, it was possible to visualize a single root of the root skeleton three-dimensionally by measuring diffusion tensors inside the root. [...]
000017290 536__ $$0G:(DE-Juel1)FUEK407$$2G:(DE-HGF)$$aTerrestrische Umwelt$$cP24$$x0
000017290 655_7 $$aHochschulschrift$$xDissertation (FH)
000017290 8564_ $$uhttps://juser.fz-juelich.de/record/17290/files/FZJ-17290.pdf$$yRestricted$$zPrepress version for printing
000017290 909CO $$ooai:juser.fz-juelich.de:17290$$pVDB:Earth_Environment$$pVDB
000017290 9141_ $$y2011
000017290 9131_ $$0G:(DE-Juel1)FUEK407$$bErde und Umwelt$$kP24$$lTerrestrische Umwelt$$vTerrestrische Umwelt$$x0
000017290 9132_ $$0G:(DE-HGF)POF3-259H$$1G:(DE-HGF)POF3-250$$2G:(DE-HGF)POF3-200$$aDE-HGF$$bMarine, Küsten- und Polare Systeme$$lTerrestrische Umwelt$$vAddenda$$x0
000017290 920__ $$lyes
000017290 9201_ $$0I:(DE-Juel1)IBG-3-20101118$$gIBG$$kIBG-3$$lAgrosphäre$$x0
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