TY  - JOUR
A1  - Opolka, Alexander
A1  - Müller, Dominik
A1  - Fella, Christian
A1  - Balles, Andreas
A1  - Mohr, Jürgen
A1  - Last, Arndt
T1  - Multi-lens array full-field X-ray microscopy
JF  - Applied Sciences
N2  - X-ray full-field microscopy at laboratory sources for photon energies above 10 keV suffers from either long exposure times or low resolution. The photon flux is mainly limited by the objectives used, having a limited numerical aperture NA. We show that this can be overcome by making use of the cone-beam illumination of laboratory sources by imaging the same field of view (FoV) several times under slightly different angles using an array of X-ray lenses. Using this technique, the exposure time can be reduced drastically without any loss in terms of resolution. A proof-of-principle is given using an existing laboratory metal-jet source at the 9.25 keV Ga K\(_α\)-line and compared to a ray-tracing simulation of the setup.
KW  - X-ray microscopy
KW  - full-field microscopy
KW  - compound refractive X-ray lenses
KW  - CRLs
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-244974
SN  - 2076-3417
VL  - 11
IS  - 16
ER  - 
TY  - JOUR
A1  - Müller, Dominik
A1  - Graetz, Jonas
A1  - Balles, Andreas
A1  - Stier, Simon
A1  - Hanke, Randolf
A1  - Fella, Christian
T1  - Laboratory-Based Nano-Computed Tomography and Examples of Its Application in the Field of Materials Research
JF  - Crystals
N2  - In a comprehensive study, we demonstrate the performance and typical application scenarios for laboratory-based nano-computed tomography in materials research on various samples. Specifically, we focus on a projection magnification system with a nano focus source. The imaging resolution is quantified with common 2D test structures and validated in 3D applications by means of the Fourier Shell Correlation. As representative application examples from nowadays material research, we show metallization processes in multilayer integrated circuits, aging in lithium battery electrodes, and volumetric of metallic sub-micrometer fillers of composites. Thus, the laboratory system provides the unique possibility to image non-destructively structures in the range of 170–190 nanometers, even for high-density materials.
KW  - nano CT
KW  - laboratory
KW  - X-ray
KW  - 3D reconstruction
KW  - instrumentation
KW  - integrated circuits
KW  - nondestructive testing
KW  - 3D X-ray microscopy
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-241048
SN  - 2073-4352
VL  - 11
IS  - 6
ER  - 
TY  - JOUR
A1  - Bazihizina, Nadia
A1  - Böhm, Jennifer
A1  - Messerer, Maxim
A1  - Stigloher, Christian
A1  - Müller, Heike M.
A1  - Cuin, Tracey Ann
A1  - Maierhofer, Tobias
A1  - Cabot, Joan
A1  - Mayer, Klaus F. X.
A1  - Fella, Christian
A1  - Huang, Shouguang
A1  - Al‐Rasheid, Khaled A. S.
A1  - Alquraishi, Saleh
A1  - Breadmore, Michael
A1  - Mancuso, Stefano
A1  - Shabala, Sergey
A1  - Ache, Peter
A1  - Zhang, Heng
A1  - Zhu, Jian‐Kang
A1  - Hedrich, Rainer
A1  - Scherzer, Sönke
T1  - Stalk cell polar ion transport provide for bladder‐based salinity tolerance in Chenopodium quinoa
JF  - New Phytologist
N2  - Chenopodium quinoa uses epidermal bladder cells (EBCs) to sequester excess salt. Each EBC complex consists of a leaf epidermal cell, a stalk cell, and the bladder.

Under salt stress, sodium (Na\(^{+}\)), chloride (Cl\(^{−}\)), potassium (K\(^{+}\)) and various metabolites are shuttled from the leaf lamina to the bladders. Stalk cells operate as both a selectivity filter and a flux controller.

In line with the nature of a transfer cell, advanced transmission electron tomography, electrophysiology, and fluorescent tracer flux studies revealed the stalk cell’s polar organization and bladder‐directed solute flow.

RNA sequencing and cluster analysis revealed the gene expression profiles of the stalk cells. Among the stalk cell enriched genes, ion channels and carriers as well as sugar transporters were most pronounced. Based on their electrophysiological fingerprint and thermodynamic considerations, a model for stalk cell transcellular transport was derived.
KW  - halophyte
KW  - polar ion transport
KW  - quinoa
KW  - salt tolerance
KW  - stalk cell
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-287222
VL  - 235
IS  - 5
SP  - 1822
EP  - 1835
ER  -