The new Cracow scanning nuclear microprobe

Lebed, S.; Stachura, Z.; Cholewa, M.; Legge, G.J.F.; Lekki, Janusz; Maranda, Stanisław; Potempa, A.; Sarnecki, C.; Szklarz, Zbigniew; Styczeń, J.; Sulkio-Cleff, B.

doi:10.1016/s0168-583x(01)00566-3

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…Except for the EPMA measurements, where sometimes the zone covered by Mg is wider, the adhesive zone contains elevated levels of Mg and Na in the range of 10-12 µm, in approximation the half of the DEJ zone. In such an approach, one should recognize the role of Mg and Na in the reconstruction of the apatite crystals [45,46] and in potential stabilization of other phases [40], from compact crystals embedded in the organic matrix to the longitudinal rods. The DEJ can also be delimited based on µ -Raman measurements, with the optical data superimposed.…”

Section: Internal Structure Of the Dej And Adhering Zonesmentioning

confidence: 99%

“…The spatial resolution of mappings was delimited by the beam spot on the target which was in the range of 3 µm × 3 µm, with the object aperture of 50 µm, and the angular collimator of 200 µm. The beam current centered on the target point was~100 pA. A detailed description of the Cracow PIXE device was given in a paper by Lebed et al [45]. The single-step size in the scan operation was set as 1.25 µm.…”

Section: µ-Pixementioning

confidence: 99%

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Novel Approach to Tooth Chemistry. Quantification of the Dental-Enamel Junction

Kuczumow¹,

Chałas

Nowak³

et al. 2021

IJMS

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The dentin-enamel junction (DEJ) is known for its special role in teeth. Several techniques were applied for the investigation of the DEJ in human sound molar teeth. The electron (EPMA) and proton (PIXE) microprobes gave consistent indications about the variability of elemental concentrations on this boundary. The locally increased and oscillating concentrations of Mg and Na were observed in the junction, in the layer adhering to the enamel and covering roughly half of the DEJ width. The chemical results were compared with the optical profiles of the junction. Our chemical and optical results were next compared with the micromechanical results (hardness, elastic modulus, friction coefficient) available in the world literature. A strong correlation of both result sets was proven, which testifies to the self-affinity of the junction structures for different locations and even for different kinds of teeth and techniques applied for studies. Energetic changes in tooth strictly connected with crystallographic transformations were calculated, and the minimum energetic status was discovered for DEJ zone. Modeling of both walls of the DEJ from optical data was demonstrated. Comparing the DEJ in human teeth with the same structure found in dinosaur, shark, and alligator teeth evidences the universality of dentin enamel junction in animal world. The paper makes a contribution to better understanding the joining of the different hard tissues.

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Section: Internal Structure Of the Dej And Adhering Zonesmentioning

confidence: 99%

Section: µ-Pixementioning

confidence: 99%

Novel Approach to Tooth Chemistry. Quantification of the Dental-Enamel Junction

Kuczumow¹,

Chałas

Nowak³

et al. 2021

IJMS

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“…For this reason, proton therapy offers better dose delivery and distribution than conventional photon-based radiotherapy [ 62 ]. A simplified scheme of the experimental setup is demonstrated in Figure 3 [ 63 ]. During the experiment, samples were irradiated with the 2 MeV protons, with the total beam power of 60 mW distributed over the spot size of ~0.3 mm 2 .…”

Section: Methodsmentioning

confidence: 99%

Interdisciplinary Methods for Zoonotic Tissue Acellularization for Natural Heart Valve Substitute of Biomimetic Materials

et al. 2022

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The goal of this work was to create a bioactive tissue-based scaffold using multi-disciplinary engineering materials and tissue engineering techniques. Materials & methods: Physical techniques such as direct laser interference lithography and proton radiation were selected as alternative methods of enzymatic and chemical decellularization to remove cells from a tissue without degradation of the extracellular matrix nor its protein structure. This study was an attempt to prepare a functional scaffold for cell culture from tissue of animal origin using new physical methods that have not been considered before. The work was carried out under full control of the histological and molecular analysis. Results & conclusions: The most important finding was that the physical methods used to obtain the decellularized tissue scaffold differed in the efficiency of cell removal from the tissue in favour of the laser method. Both the laser method and the proton method exhibited a destructive effect on tissue structure and the genetic material in cell nuclei. This effect was visible on histology images as blurred areas within the cell nucleus. The finite element 3D simulation of decellularization process of the three-layer tissue of animal origin sample reflected well the mechanical response of tissue described by hyperelastic material models and provided results comparable to the experimental ones.

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“…However, high energy proton beam machining of materials spreads from the microworld to the nanoworld since the first appearance of true scanning nuclear nanoprobes [7]. Although strong efforts are made in order to increase the beam current in an even smaller beam spot [7][8][9] in contrast to the typical 10 6 -10 9 pA/mm 2 current density of scanning nuclear microprobes [10][11][12], they usually achieve very small spot sizes with orders of magnitude lower current densities (e.g. [13]).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Low and High Current Density Proton Irradiation Effects on the Surface Morphology of Poly(tetrafluoroethylene)

2019

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A comparison is given about the effects of low and high current density proton irradiations on the surface topography of poly(tetrafluoroethylene). 1 MeV proton beam was used for the experiments with 10 and 10 8 pA/mm 2 current densities. For the high current density irradiations, the beam was micro-focused, while for the low current density beam it was highly under-focused. The applied ion fluences were 0.1-1000 nC/mm 2 (6.24 × 10 10-6.24 × 10 14 ion/cm 2). Differential interference contrast microscopy, surface profilometry, and scanning electron microscopy were used to investigate the changes of the surface morphology. It is found that at low fluences the surface is etched similarly due to low and high current density irradiations, while at high fluences thermal processes differentiate the behaviour of the surface.

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The new Cracow scanning nuclear microprobe

Cited by 13 publications

References 7 publications

Novel Approach to Tooth Chemistry. Quantification of the Dental-Enamel Junction

Novel Approach to Tooth Chemistry. Quantification of the Dental-Enamel Junction

Interdisciplinary Methods for Zoonotic Tissue Acellularization for Natural Heart Valve Substitute of Biomimetic Materials

Comparison of Low and High Current Density Proton Irradiation Effects on the Surface Morphology of Poly(tetrafluoroethylene)

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