Methane Bubble Growth and Migration in Aquatic Sediments Observed by X-ray μCT

2018 ◽  
Vol 52 (4) ◽  
pp. 2007-2015 ◽  
Author(s):  
Liu Liu ◽  
Tim De Kock ◽  
Jeremy Wilkinson ◽  
Veerle Cnudde ◽  
Shangbin Xiao ◽  
...  
Keyword(s):  
Bubble Growth ◽  
Aquatic Sediments ◽  
X Ray ◽  
Methane Bubble ◽  
And Migration

scholarly journals XPS Modeling of Immobilized Recombinant Angiogenin and Apoliprotein A1 on Biodegradable Nanofibers

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 879
Author(s):  
Anton Manakhov ◽  
Elizaveta Permyakova ◽  
Sergey Ershov ◽  
Svetlana Miroshnichenko ◽  
Mariya Pykhtina ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Growth Factor ◽  
Photoelectron Spectroscopy ◽  
Antioxidant Activities ◽  
Fluorescent Microscopy ◽  
X Ray ◽  
Vascular Growth ◽  
Vascular Growth Factor ◽  
And Migration ◽  
Protein Density

The immobilization of viable proteins is an important step in engineering efficient scaffolds for regenerative medicine. For example, angiogenin, a vascular growth factor, can be considered a neurotrophic factor, influencing the neurogenesis, viability, and migration of neurons. Angiogenin shows an exceptional combination of angiogenic, neurotrophic, neuroprotective, antibacterial, and antioxidant activities. Therefore, this protein is a promising molecule that can be immobilized on carriers used for tissue engineering, particularly for diseases that are complicated by neurotrophic and vascular disorders. Another highly important and viable protein is apoliprotein A1. Nevertheless, the immobilization of these proteins onto promising biodegradable nanofibers has not been tested before. In this work, we carefully studied the immobilization of human recombinant angiogenin and apoliprotein A1 onto plasma-coated nanofibers. We developed a new methodology for the quantification of the protein density of these proteins using X-ray photoelectron spectroscopy (XPS) and modeled the XPS data for angiogenin and apoliprotein A1 (Apo-A1). These findings were also confirmed by the analysis of immobilized Apo-A1 using fluorescent microscopy. The presented methodology was validated by the analysis of fibronectin on the surface of plasma-coated poly(ε-caprolactone) (PCL) nanofibers. This methodology can be expanded for other proteins and it should help to quantify the density of proteins on surfaces using routine XPS data treatment.

Kinetics of bubble growth in wheat flour dough during proofing studied by computed X-ray micro-tomography

2012 ◽  
Vol 56 (3) ◽  
pp. 676-683 ◽  
Author(s):  
A. Turbin-Orger ◽  
E. Boller ◽  
L. Chaunier ◽  
H. Chiron ◽  
G. Della Valle ◽  
...  
Keyword(s):  
Wheat Flour ◽  
Bubble Growth ◽  
X Ray ◽  
Flour Dough ◽  
Wheat Flour Dough ◽  
Micro Tomography ◽  
Kinetics Of

scholarly journals Transformation and migration in secondary zinc–air batteries studied by in situ synchrotron X-ray diffraction and X-ray tomography

2019 ◽  
Vol 7 (11) ◽  
pp. 6459-6466 ◽  
Author(s):  
Mathias K. Christensen ◽  
Jette Katja Mathiesen ◽  
Søren Bredmose Simonsen ◽  
Poul Norby
Keyword(s):  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Unique Information ◽  
Air Battery ◽  
And Migration ◽  
Battery Anode ◽  
Zinc Air Batteries

Unique information about transformation and phase redistribution in a Zn–air battery anode was obtained using high energy synchrotron X-ray diffraction.

scholarly journals In situ investigation of dissociation and migration phenomena at the Pt/electrolyte interface of an electrochemical cell

2015 ◽  
Vol 6 (10) ◽  
pp. 5635-5642 ◽  
Author(s):  
Yeuk Ting Law ◽  
Spyridon Zafeiratos ◽  
Stylianos G. Neophytides ◽  
Alin Orfanidi ◽  
Dominique Costa ◽  
...  
Keyword(s):  
Double Layer ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Cell ◽  
Ambient Pressure ◽  
Liquid Electrolyte ◽  
X Ray ◽  
Electrolyte Interface ◽  
In Situ Investigation ◽  
And Migration

Using near ambient pressure X-ray photoelectron spectroscopy we probe in situ the double layer at the Pt/liquid electrolyte interface.

Exploring coherent electron excitation and migration dynamics by electron diffraction with ultrashort X-ray pulses

2017 ◽  
Vol 19 (38) ◽  
pp. 25846-25852 ◽  
Author(s):  
Kai-Jun Yuan ◽  
André D. Bandrauk
Keyword(s):  
Electron Diffraction ◽  
Chemical Reactions ◽  
Electron Excitation ◽  
Charge Migration ◽  
X Ray ◽  
Migration Dynamics ◽  
And Migration

Exploring ultrafast charge migration is of great importance in biological and chemical reactions.

X-RAY IRRADIATION AFFECTS MORPHOLOGY, PROLIFERATION AND MIGRATION RATE OF HEALTHY AND CANCER CELLS

2015 ◽  
Vol 15 (02) ◽  
pp. 1540022 ◽  
Author(s):  
VALERIA PANZETTA ◽  
MARTA DE MENNA ◽  
DEBORA BUCCI ◽  
VITTORIA GIOVANNINI ◽  
MARIAGABRIELLA PUGLIESE ◽  
...  
Keyword(s):  
Simian Virus 40 ◽  
Simian Virus ◽  
Cell Phenotype ◽  
X Rays ◽  
X Ray ◽  
Cellular Processes ◽  
And Migration ◽  
Normalization Effect ◽  
Different Doses ◽  
Proliferation And Migration

Cytoskeleton plays a central role in many cellular processes, such as migration, adhesion and proliferation. Alterations of its structural properties are commonly associated with different diseases (malignancy, cardiac hypertrophy, etc.). In this work, we studied the effects of X-radiations on cytoskeleton architecture of two cell lines: BALBc/3T3 and Simian virus 40-transformed BALBc/3T3 (SVT2) cells. In agreement with the current literature, we observed reduced adhesion and increased motility of SVT2 cells respect to non-transformed BALBc/3T3. In addition, we showed that two different doses of X-rays (1 and 2 Gy) increased cell-dish adhesiveness and reduced cell proliferation and cell motility of transformed cells, whereas minor effects were measured on the normal counterpart. These results suggested that low doses or fractioning of X-rays may have a normalization effect on the investigated parameters for the transformed cell phenotype.

Electrical Studies on PZT Ceramic

2012 ◽  
Vol 560-561 ◽  
pp. 816-819
Author(s):  
N.V. Prasad ◽  
B. Ramaiah ◽  
V. Nathanial ◽  
M. Chandra Sekhar
Keyword(s):  
Oxygen Vacancies ◽  
Single Phase ◽  
Polycrystalline Sample ◽  
Solid State Reaction Method ◽  
Electrical Behavior ◽  
Conduction Model ◽  
X Ray ◽  
Electrical Studies ◽  
Different Temperatures ◽  
And Migration

Polycrystalline sample of PZT (52/48) was prepared by solid-state reaction method. X-ray analysis indicated the formation of single-phase. Electrical and impedance-spectroscopy plots were employed to analyze the electrical behavior of the sample, as a function of frequency, in the range of 0.01 Hz to 1 M Hz at different temperatures. Spectroscopic and complex plots indicated non-Debye dielectric relaxation. Detailed electrical studies revealed that the conduction is through hoping of electrons (extrinsic region) at lowers temperature and migration of oxygen vacancies at high temperature (intrinsic region). The results are explained using Euryod’s conduction model and confirmed with pyroelectric and ferroelectric data.

Kinetics of methane bubble growth in a 1020 steel

1984 ◽  
Vol 15 (3) ◽  
pp. 487-494 ◽  
Author(s):  
Binayak Panda ◽  
Paul Shewmon
Keyword(s):  
Bubble Growth ◽  
Methane Bubble ◽  
Kinetics Of

Fragmentation, nucleation and migration of crystals and bubbles in the Bishop Tuff rhyolitic magma

2004 ◽  
Vol 95 (1-2) ◽  
pp. 375-390 ◽  
Author(s):  
Guilherme A. R. Gualda ◽  
David L. Cook ◽  
Rahul Chopra ◽  
Liping Qin ◽  
Alfred T. Anderson ◽  
...  
Keyword(s):  
Size Distributions ◽  
Bishop Tuff ◽  
Volumetric Fraction ◽  
Slow Cooling ◽  
Magma Body ◽  
Rhyolitic Magma ◽  
X Ray ◽  
High Silica ◽  
And Migration ◽  
Crystal Content

ABSTRACTThe Bishop Tuff (USA) is a large-volume, high-silica pyroclastic rhyolite. Five pumice clasts from three early stratigraphic units were studied. Size distributions were obtained using three approaches: (1) crushing, sieving and winnowing (reliable for crystals >100 μm); (2) microscopy of ∼1 mm3 fragments (preferable for crystals <100 μm); and (3) computerised X-ray microtomography of ∼1 cm3 pumice pieces.Phenocryst fragments coated with glass are common, and the size distributions for all crystals are concave-upward, indicating that crystal fragmentation is an important magmatic process.Three groups are recognised, characterised by: (1) high-density (0·759–0·902 g cm−3), high-crystal content (14·4–15·3 wt.%) and abundant large crystals (>800 μm); concave-downward size distributions for whole crystals indicate late-stage growth with limited nucleation, compatible with the slow cooling of a large, gas-saturated, stably stratified magma body; (2) low-density (0·499 g cm −3), low-crystal content (6·63 wt.%) and few large crystals; the approximately linear size distribution reveals that nucleation was locally important, perhaps close to the walls; and (3) intermediate characteristics in all respects.The volumetric fraction of bubbles inversely correlates with the number of large crystals. This is incompatible with isobaric closed-system crystallisation, but can be explained by sinking of large crystals and rise of bubbles in the magma

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