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128 results on '"Thieme, Juergen"'

101. Bragg—Fresnel Optics

Author

Aristov, V. V., Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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104. Spectromicroscopy with Soft X-Rays at Hasylab

Author

Voss, J., von Rautenfeld, K. Berens, Fornefett, M., Friedrich, J., Pretorius, M., Schroeder, M., Sievers, H., Ranck, A., Wachsmuth, M., Wedemeier, V., Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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113. Applications of Laboratory Soft X-Ray Systems

Author

Michette, A. G., Buckley, C. J., Pfauntsch, S. J., Khaleque, N., English, T., Folkard, M., Michael, B. D., Schettino, G., Turcu, I. C. E., Allott, R., Lisi, N., Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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118. Imaging Soft X-Ray Microscopy with Zone Plates in Parallel Use of Optical Microscope for Wet Bio-Specimens in Air at UVSOR

Author

Watanabe, Norio, Hirai, Atsuhiko, Takemoto, Kuniko, Shimanuki, Yoshio, Taniguchi, Mieko, Anderson, Eric, Attwood, David, Kern, D., Shimizu, Sumito, Nagata, Hiroshi, Kawasaki, Kenzo, Aoki, Sadao, Nakayama, Yasuyuki, Kihara, Hiroshi, Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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124. X-Ray Microscopy in Berkeley

Author

Meyer-Ilse, W., Medecki, H., Brown, J. T., Heck, J. M., Anderson, E. H., Stead, A., Ford, T., Balhorn, R., Petersen, C., Magowan, C., Attwood, D. T., Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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125. X-Ray Microscopy in Aarhus

Author

Abraham, Joanna, Medenwaldt, Robin, Uggerhøj, Erik, Guttmann, P., Hjort, T., Jensenius, J., Vorup-Jensen, T., Vollrath, F., Søgaard, E., Møller, J. Tyge, Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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127. Nanoparticle size and coating chemistry control foliar uptake pathways, translocation, and leaf-to-rhizosphere transport in wheat

Author

Eleanor Spielman-Sun, Yilin Zhang, Astrid Avellan, Enzo Lombi, Jason M. Unrine, Jie Yun, Juergen Thieme, Garret D. Bland, Gregory V. Lowry, Jieran Li, Avellan, Astrid, Yun, Jie, Zhang, Yilin, Spielman-Sun, Eleanor, Unrine, Jason M, Thieme, Juergen, Li, Jieran, Lombi, Enzo, Bland, Garret, and Lowry, Gregory V

Subjects
Cuticle, foliar application of nanoparticles, Metal Nanoparticles, General Physics and Astronomy, Nanoparticle, Chromosomal translocation, 02 engineering and technology, engineering.material, 010402 general chemistry, Plant Roots, 01 natural sciences, root exudation, Coating, enhanced dark-field microscopy coupled with hyperspectral imaging, General Materials Science, Particle Size, Triticum, agriculture, Rhizosphere, Chemistry, fungi, General Engineering, Rational design, food and beverages, Biological Transport, Adhesion, 021001 nanoscience & nanotechnology, X-ray fluorescence mapping, uptake pathways, 0104 chemical sciences, Plant Leaves, Colloidal gold, engineering, Biophysics, 0210 nano-technology, in planta translocation
Abstract

Nanoenabled foliar-applied agrochemicals can potentially be safer and more efficient than conventional products. However, limited understanding about how nanoparticle properties influence their interactions with plant leaves, uptake, translocation through the mesophyll to the vasculature, and transport to the rest of the plant prevents rational design. This study used a combination of Au quantification and spatial analysis to investigate how size (3, 10, or 50 nm) and coating chemistry (PVP versus citrate) of gold nanoparticles (AuNPs) influence these processes. Following wheat foliar exposure to AuNPs suspensions (∼280 ng per plant), adhesion on the leaf surface was increased for smaller sizes, and PVP-AuNPs compared to citrate-AuNPs. After 2 weeks, there was incomplete uptake of citrate-AuNPs with some AuNPs remaining on the outside of the cuticle layer. However, the fraction of citrate-AuNPs that had entered the leaf was translocated efficiently to the plant vasculature. In contrast, for similar sizes, virtually all of the PVP-AuNPs crossed the cuticle layer after 2 weeks, but its transport through the mesophyll cells was lower. As a consequence of PVP-AuNP accumulation in the leaf mesophyll, wheat photosynthesis was impaired. Regardless of their coating and sizes, the majority of the transported AuNPs accumulated in younger shoots (10–30%) and in roots (10–25%), and 5–15% of the NPs

Published
2019

128. Deliberate Modification of Fe 3 O 4 Anode Surface Chemistry: Impact on Electrochemistry.

Author

Wang L, Housel LM, Bock DC, Abraham A, Dunkin MR, McCarthy AH, Wu Q, Kiss A, Thieme J, Takeuchi ES, Marschilok AC, and Takeuchi KJ

Abstract

Fe 3 O 4 nanoparticles (NPs) with an average size of 8-10 nm have been successfully functionalized with various surface-treatment agents to serve as model systems for probing surface chemistry-dependent electrochemistry of the resulting electrodes. The surface-treatment agents used for the functionalization of Fe 3 O 4 anode materials were systematically varied to include aromatic or aliphatic structures: 4-mercaptobenzoic acid, benzoic acid (BA), 3-mercaptopropionic acid, and propionic acid (PA). Both structural and electrochemical characterizations have been used to systematically correlate the electrode functionality with the corresponding surface chemistry. Surface treatment with ligands led to better Fe 3 O 4 dispersion, especially with the aromatic ligands. Electrochemistry was impacted where the PA- and BA-treated Fe 3 O 4 systems without the -SH group demonstrated a higher rate capability than their thiol-containing counterparts and the pristine Fe 3 O 4 . Specifically, the PA system delivered the highest capacity and cycling stability among all samples tested. Notably, the aromatic BA system outperformed the aliphatic PA counterpart during extended cycling under high current density, due to the improved charge transfer and ion transport kinetics as well as better dispersion of Fe 3 O 4 NPs, induced by the conjugated system. Our surface engineering of the Fe 3 O 4 electrode presented herein, highlights the importance of modifying the structure and chemistry of surface-treatment agents as a plausible means of enhancing the interfacial charge transfer within metal oxide composite electrodes without hampering the resulting tap density of the resulting electrode.

Published
2019
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