Results 101 to 110 of about 337,692 (304)

A case of crossed cerebellar diaschisis on follow-up positron emission tomography/computed tomography with (18F) fluoro-D-glucose after treatment for glioblastoma

World Journal of Nuclear Medicine, 2019
Crossed cerebellar diaschisis (CCD) represents the reduction of blood flow, metabolism, and oxygen consumption in the cerebellar hemisphere contralateral to a cerebral focal lesion.
Dimitrios Priftakis, Phivi Rondogianni, Ioannis Datseris   +2 more
doaj   +1 more source

Positron accumulations from stellar nucleosynthesis

Frontiers in Astronomy and Space Sciences
The predominant fusion chain in stellar nucleosynthesis produces positron and neutrino byproducts in equal amounts. An extremely high neutrino flux can be directly measured, but the unobservable, yet equally high flux of positrons is traditionally ...
Joseph Caleb Philipps, John Gahl, John Gahl, Lisa Shepard, Andrew Gillespie   +4 more
doaj   +1 more source

Structural and Compositional Effects on the Scintillation Properties of Fast Emitting Metal‐Organic Frameworks

Advanced Science, EarlyView.
The crystalline structure, the atomic numbers of the constituent elementsand the size of MOF crystals each influence their photoluminescence and scintillation properties in distinct ways. Together, these factors provide valuable guidelines for designing systems with optimized performance and tunable timing characteristics, arising from the synergistic ...
Francesca Cova, Jacopo Perego, Biplab Joarder, Nobuhiro Yanai, Anna Vedda, Silvia Bracco, Angiolina Comotti, Angelo Monguzzi, Irene Villa   +8 more
wiley   +1 more source

Association between cognitive performance and cortical glucose metabolism in patients with mild Alzheimer's disease [PDF]

, 2005
Background: Neuronal and synaptic function in Alzheimer's disease (AD) is measured in vivo by glucose metabolism using positron emission tomography (PET). Objective: We hypothesized that neuronal activation as measured by PET is a more sensitive index of
Teipel, S. J., Schwaiger, Markus, Drzezga, A., Hampel, H., Bokde, ALW, Leinsinger, G., Born, C., Thissen, J., Bartenstein, P., Dong, W., Schwaiger, M., Möller, Hans-Jürgen, Bokde, AL;Teipel, SJ;Drzezga, A;Thissen, J;Bartenstein, P;Dong, W;Leinsinger, G;Born, C;Schwaiger, M;Moeller, HJ;Hampel, H, Bokde, A.L.W.;Teipel, S. J.;Drzezga, A.;Thissen, J.;Bartenstein, P.;Dong, W.;Leinsinger, G.;Born, C.;Schwaiger, M.;Moeller, H.-J.;Hampel, H.   +13 more
core   +1 more source

Hyperpolarization of [1‐13C]Ketoisocaproate‐d2 by Reversible Exchange with Parahydrogen Enables Profiling of Branched‐Chain‐Amino‐Acid Metabolism in Cellulo and in Vivo

Advanced Science, EarlyView.
We report the fast generation of biocompatible solutions of highly 13C‐hyperpolarized (≈11%) partially‐deuterated ketoisocaproate within <6 min using spin‐lock‐induced crossing and reversible exchange with parahydrogen (SLIC‐SABRE). This enables rapid detection of branched‐chain‐amino‐acid transferase 1 (BCAT1) protein expression and investigation of ...
Stefan Petersen, Philipp R. Groß, Paul M. Schmidt, Henri de Maissin, Asitan Rittinger, Robert Willing, Adriana Sacristán‐Martín, Lisa Heß, Jule Koch, Sebastian Lucas, Maxim Zaitsev, Dominik von Elverfeldt, Martin Grashei, Franz Schilling, Jan‐Bernd Hövener, André F. Martins, Max von Delius, Thomas Reinheckel, Andreas B. Schmidt   +18 more
wiley   +1 more source

Ultra‐Radiostable Covalent Conformationally Interlocked Networks Enabling a Universal Radiometal‐Labeling Platform for Cancer Radioembolization

Advanced Science, EarlyView.
Conjugated poly(imide dioxime)‐based microspheres establish a radiometal coordination‐driven conformational interlocked network with ultra‐high radiostability. This platform enables low‐temperature, multi‐radionuclide labeling for SPECT/PET/MRI imaging and radionuclide therapy. Mechanistic insights from EXAFS and DFT reveal enhanced stability, while in
Xiao Xu, Zhenwen Zhao, Yangjie Wang, Zhigang Liu, Zhijie Liu, Xiaoling Li, Zhichen Mao, Lu Xu, Gan Lin, Gang Liu, Hongjuan Ma   +10 more
wiley   +1 more source

Charge‐Transfer‐Mediated Boron Magneto‐Ionics: Towards Voltage‐Driven Multi‐Ion Transport

Advanced Science, EarlyView.
This study demonstrates voltage‐driven multi‐ion transport in FeBO systems, revealing simultaneous motion of B, Fe, and O ions enabled by charge‐transfer effects. By tuning oxidation states through oxygen incorporation, we achieve a transition from electrostatic‐like to electrochemical magneto‐ionic behavior. The findings establish boron magneto‐ionics,
Zheng Ma, Karim‐Alexandros Kantre, Huan Tan, Aitor Arredondo‐López, Maciej O. Liedke, Javier Herrero‐Martín, Eric Hirschmann, Andreas Wagner, Daniel Mora‐Blanco, Alberto Quintana, Salvador Pané, Eva Pellicer, Josep Nogués, Johan Meersschaut, Jordi Sort, Enric Menéndez   +15 more
wiley   +1 more source

CA9‐Targeted PET Imaging for Noninvasive Discrimination of Clear Cell Renal Cell Carcinoma and Associated Tumor Biological Features

Advanced Science, EarlyView.
CA9‐targeted PET imaging could be a noninvasive approach to characterize clear cell renal cell carcinoma and associated tumor biology. PET uptake correlates with tumor CA9 expression and is linked to angiogenic activity, immune remodeling, and metabolic reprogramming.
Kailei Chen, Sixuan Cheng, Jian Shi, Ruijie Liu, Yilong Wu, Xin Zheng, Xinlun Song, Yunxuan Zhang, Lei Liu, Zhihao Wei, Qi Wang, Xinwei Li, Zirui Dong, Yuenan Liu, Hongmei Yang, Xiaoli Lan, Chunxia Qin, Dawei Jiang, Keshan Wang, Xiaoping Zhang   +19 more
wiley   +1 more source

Calculating the size of positronium

Известия высших учебных заведений. Поволжский регион: Физико-математические науки
Background. A fairly common error has been established in the particular case of the problem of two bodies of the same mass performing circular motion around a fixed center of their mass, which consists in the fact that the radius of rotation is found ...
I.P. Popov
doaj   +1 more source

Polarization and Forward Scattering Effects in Low Energy Positron Collisions with H₂

Hydrogen
Positron physical-chemistry has been one important focus of scientific investigation of the last decades, however their low energy scattering by atoms and molecules still offers many questions to be answered, as the low angle scattering effects on the ...
Wagner Tenfen, Josiney de Souza Glória, Sarah Esther da Silva Saab, Eliton Popovicz Seidel, Felipe Arretche   +4 more
doaj   +1 more source