A size-adjustable radiofrequency coil for investigating plants in a Halbach magnet

Oligschläger, Dirk; Rehorn, Christian; Lehmkuhl, Sören; Adams, Michael L.; Adams, Alina; Blümich, Bernhard

doi:10.1016/j.jmr.2017.03.010

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…Another example of such designed instruments is the NMR system developed by Van As et al [18] equipped with a permanent U-shaped magnet, with an access space of 2 cm used to study water content and transport in plants in greenhouses and climate chambers [19, 20]. Recently, a size-adjustable radiofrequency coil allowing investigation of plant samples of different diameters in a Halbach magnet has been proposed [21]. Finally, a few portable MRI systems have recently been developed mostly for the imaging of relatively small living trees for use in greenhouses [17, 22–24].…”

Section: Introductionmentioning

confidence: 99%

A mobile NMR lab for leaf phenotyping in the field

et al. 2017

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BackgroundLow field NMR has been used to investigate water status in various plant tissues. In plants grown in controlled conditions, the method was shown to be able to monitor leaf development as it could detect slight variations in senescence associated with structural modifications in leaf tissues. The aim of the present study was to demonstrate the potential of NMR to provide robust indicators of the leaf development stage in plants grown in the field, where leaves may develop less evenly due to environmental fluctuations. The study was largely motivated by the need to extend phenotyping investigations from laboratory experiments to plants in their natural environment.MethodsThe mobile NMR laboratory was developed, enabling characterization of oilseed rape leaves throughout the canopy without uprooting the plant. The measurements made on the leaves of plants grown and analyzed in the field were compared to the measurements on plants grown in controlled conditions and analyzed in the laboratory.ResultsThe approach demonstrated the potential of the method to assess the physiological status of leaves of plants in their natural environment. Comparing changes in the patterns of NMR signal evolution in plants grown under well-controlled laboratory conditions and in plants grown in the field shows that NMR is an appropriate method to detect structural modifications in leaf tissues during senescence progress despite plant heterogeneity in natural conditions. Moreover, the specific effects of the environmental factors on the structural modifications were revealed.ConclusionThe present study is an important step toward the selection of genotypes with high tolerance to water or nitrogen depletion that will be enabled by further field applications of the method.

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Section: Introductionmentioning

confidence: 99%

A mobile NMR lab for leaf phenotyping in the field

et al. 2017

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“…Time‐domain NMR with tabletop instruments is extensively used by the food industry to determine the solid‐fat content and droplet‐size distributions in foods and emulsions and for liquid typing and quantification such as oil in olives whereby the sample is inserted into the magnet . Centerfield magnets have also been employed to study living plants in greenhouses and outdoors as well as harvest quality, whereas stray‐field magnets bear promise for characterizing the state and function of surface‐near biological tissues like skin and tendon benefitting from the mobility of the compact design . The use of stray‐field magnets has also been explored to inspect packaged food and the fat content of meat in life animals …”

Section: Laplace Nmrmentioning

confidence: 99%

Desktop NMR and Its Applications From Materials Science To Organic Chemistry

2017

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NMR spectroscopy is an indispensable method of analysis in chemistry, which until recently suffered from high demands for space, high costs for acquisition and maintenance, and operational complexity. This has changed with the introduction of compact NMR spectrometers suitable for small-molecule analysis on the chemical workbench. These spectrometers contain permanent magnets giving rise to proton NMR frequencies between 40 and 80 MHz. The enabling technology is to make small permanent magnets with homogeneous fields. Tabletop instruments with inhomogeneous fields have been in use for over 40 years for characterizing food and hydrogen-containing materials by relaxation and diffusion measurements. Related NMR instruments measure these parameters in the stray field outside the magnet. They are used to inspect the borehole walls of oil wells and to test objects nondestructively. The state-of-the-art of NMR spectroscopy, imaging and relaxometry with compact instruments is reviewed.

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“…B. Öl in Oliven, wobei die Probe in den Magneten eingeführt wird . Zentralfeldmagnete werden auch zur Untersuchung von lebenden Pflanzen in der Natur und Gewächshäusern sowie von Erntequalität genutzt, wohingegen Streufeldmagnete vielversprechend im Hinblick auf die Charakterisierung von Zustand und Funktion von oberflächennahem biologischen Gewebe wie Haut und Sehnen sind, wobei das kompakte, mobile Design von großem Vorteil ist . Streufeldmagnete wurden ebenfalls für die Untersuchung von verpackten Lebensmitteln sowie vom Fettgehalt im Fleisch lebender Tiere erprobt …”

Section: Laplace‐nmrunclassified

NMR mit Tischgeräten und deren Anwendungen von der Materialwissenschaft bis zur organischen Chemie

Blümich

Singh

2017

Angewandte Chemie

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Die NMR‐Spektroskopie ist eine unverzichtbare Analysemethode. Bis vor kurzem erforderten die Geräte viel Platz, waren teuer und schwer zu bedienen. Dies hat sich mit der Einführung kompakter NMR‐Spektrometer geändert, die sich für die Analyse kleiner Moleküle auf der Laborbank eignen. Solche Spektrometer sind mit Permanentmagneten für 1H‐NMR‐Frequenzen zwischen 40 und 80 MHz ausgestattet. Erst seit wenigen Jahren gibt es kleine Permanentmagnete mit homogenen Magnetfeldern für hochaufgelöste Spektroskopie. Tischgeräte mit inhomogenen Feldern werden schon seit 40 Jahren zur Charakterisierung von Lebensmitteln und Materialien über Relaxations‐ und Diffusionsmessungen genutzt. Ähnliche NMR‐Geräte messen diese Parameter im Streufeld außerhalb des Magneten. Sie werden zur Untersuchung von Bohrlochwänden in Ölquellen sowie für zerstörungsfreie Analysenverwendet. Der gegenwärtige Stand von NMR‐Spektroskopie, ‐Bildgebung und ‐Relaxometrie wird hier anhand repräsentativer Beispiele beschrieben.

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A size-adjustable radiofrequency coil for investigating plants in a Halbach magnet

Cited by 7 publications

References 32 publications

A mobile NMR lab for leaf phenotyping in the field

A mobile NMR lab for leaf phenotyping in the field

Desktop NMR and Its Applications From Materials Science To Organic Chemistry

NMR mit Tischgeräten und deren Anwendungen von der Materialwissenschaft bis zur organischen Chemie

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