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Ultraviolet Photodissociation of the ,-Dimethylformamide Cation.
J Phys Chem A
December 2024
Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Rd, Oxford OX1 3TA, U.K.
,-Dimethylformamide (DMF) provides a useful small-molecule model for studying features of the peptide bond that forms the backbone of proteins. We report results from a comprehensive multimass velocity-map imaging study into the ultraviolet (UV) photolysis of the ,-dimethylformamide cation (DMF) at wavelengths of 225, 245, and 280 nm. Electronic structure calculations on DMF and DMF were employed to help interpret the experimental results.
View Article and Find Full Text PDFHydrogel-based 3D fabrication of multiple replicas with varying sizes and materials from a single template iterative shrinking.
Soft Matter
November 2024
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
3D printing technologies have been widely used for the rapid prototyping of 3D structures, but their application in a broader context has been hampered by their low printing throughput. For the same structures to be produced in a variety of sizes and materials, each must be printed separately, which increases time and cost. Replicating 3D-printed structures in a variety of sizes using a molding process with size-tunable molds could be a solution, but it has only been applied to simple structures, such as those with tapered or vertical profiles.
View Article and Find Full Text PDFThree-Dimensional Nanoscale Imaging of SiO2 Nanofiller in Styrene-Butadiene Rubber with High-Resolution and High-Sensitivity Ptychographic X-ray Computed Tomography.
Microsc Microanal
November 2024
International Center for Synchrotron Radiation Innovation Smart (SRIS), Tohoku University, 468-1 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8572, Japan.
SiO2 aggregates in styrene-butadiene rubber (SBR) were observed using ptychographic X-ray computed tomography (PXCT). The rubber composites were illuminated with X-rays focused by total reflection focusing mirrors, and the ptychographic diffraction patterns were collected using a CITIUS detector in the range of -75° to +75° angle of incidence. The projection images of the rubber composites were reconstructed with a two-dimensional resolution of 76 nm, and no significant structural changes were observed during the PXCT measurements.
View Article and Find Full Text PDFGradient-induced instability in tumour spheroids unveils the impact of microenvironmental nutrient changes.
Sci Rep
September 2024
Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, P. Le V. Tecchio 80, 80125, Naples, Italy.
Tumours often display invasive behaviours that induce fingering, branching and fragmentation processes. The phenomenon, known as diffusional instability, is driven by differential cell proliferation, migration, and death due to the presence of metabolite and catabolite concentration gradients. An understanding of the intricate dynamics of this spatially heterogeneous process plays a key role in the investigation of tumour growth and invasion.
View Article and Find Full Text PDFSimulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body.
Sci Rep
June 2024
School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China.
Article Synopsis
- Creep in rock bodies is linked to the development of microscopic cracks, and this study uses GDEM software to model X-fractured rock to understand how these cracks expand and cause rupture.
- The findings indicate that X-fractured rocks primarily experience tensile damage, and factors like sub-fracture length and intersection angle significantly influence the creep behavior and damage levels.
- The research provides insights into the damage processes in rock engineering, showing that different intersection angles and fracture lengths affect the timing and extent of damage during the creep process.
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