Results 41 to 50 of about 33,357 (209)

A Single‐Enzyme Activated CRISPR‐Cas12a Nano System via Subtly Balanced dsDNA for Kinetic‐Gated UDG Detection and Spatiotemporal Cellular Imaging

Advanced Science, EarlyView.
Kinetic‐gated CRISPR–Cas12a activation enables single‐enzyme detection and spatiotemporal imaging of UDG ABSTRACT Uracil‐DNA glycosylase (UDG) is a key enzyme in base excision repair and an important biomarker for genomic stability and disease. In many reported sensing systems, uracil excision is coupled to signal generation through additional ...
Kejun Dong, Hao Hu, Haiyun Wang, Zijia Zheng, Shuangshuang Cheng, Wan Shu, Ruisi Liu, Xiaoyan Xin, Shiyi Huang, Dingchao Qian, Xianjin Xiao, Qiang Fu, Hongbo Wang   +12 more
wiley   +1 more source

Near-Earth Supernova Explosions: Evidence, Implications, and Opportunities [PDF]

, 2019
There is now solid experimental evidence of at least one supernova explosion within 100 pc of Earth within the last few million years, from measurements of the short-lived isotope ⁶⁰Fe in widespread deep-ocean samples, as well as in the lunar regolith ...
Fields, Brian D., Mewaldt, Richard A.
core  

Sub-millimeter nuclear medical imaging with high sensitivity in positron emission tomography using beta-gamma coincidences

, 2014
We present a nuclear medical imaging technique, employing triple-gamma trajectory intersections from beta^+ - gamma coincidences, able to reach sub-millimeter spatial resolution in 3 dimensions with a reduced requirement of reconstructed intersections ...
Habs, D., Lang, C., Parodi, K., Thirolf, P. G.   +3 more
core   +1 more source

Radioactive Probes of the Supernova-Contaminated Solar Nebula: Evidence that the Sun was Born in a Cluster [PDF]

, 2006
We construct a simple model for radioisotopic enrichment of the protosolar nebula by injection from a nearby supernova, based on the inverse square law for ejecta dispersion.
Brian D. Fields, Cosarinsky M., Hauri E. H., John J. Tobin, Kleine T., Kleine T., Leslie W. Looney, Meyer B. S., Meyer B. S., Nyquist L. E., Yorke H. W., Young E. D.   +11 more
core   +3 more sources

Highly Efficient Extraction of 212 Pb/212Bi from the Decay Chain of 232Th‐Based on Anion Exchange in Bromide Medium

Advanced Science, EarlyView.
This work provides an effective strategy for selectively extracting 212Pb and 212Bi from the decay chain of 232Th as well as its mechanism illustration. Using the novel strategy, 2.07 MBq of 212Pb is successfully separated from 232Th and its daughters, which enables the supply of 212Pb/212Bi directly from the abundant natural thorium resource to be ...
Lifeng Chen, Wannian Feng, Yuezhou Wei, Xuexiang He, Shaoying Wang, Zhongyuan Zhou, Qiang Wu, Ningchao Zheng, Xiangbiao Yin, Wenlong Li, Lingling Su, Shunyan Ning   +11 more
wiley   +1 more source

Production of Medical Radioisotopes with High Specific Activity in Photonuclear Reactions with $\gamma$ Beams of High Intensity and Large Brilliance

, 2010
We study the production of radioisotopes for nuclear medicine in $(\gamma,x{\rm n}+y{\rm p})$ photonuclear reactions or ($\gamma,\gamma'$) photoexcitation reactions with high flux [($10^{13}-10^{15}$)$\gamma$/s], small diameter $\sim (100 \, \mu$m$)^2 ...
A. Bishayee, A.C. Apostolidis, A.C. Apostolidis, B. Ponsard, C. Grignon, C.A. Boswell, C.J. Anderson, Ch. Schiepers, D. Baltas, D. Habs, D. Habs, D.M. Lewis, E. Garin, E. Segrè, F. Albert, F. Buchegger, F.F. (Russ) Knapp Jr., G.E. Mitchell, G.J. Beyer, G.J.R. Cook, H. Uusijärvi, H.A. Weidenmüller, H.R. Maecke, H.R. Weller, I. Stefanescu, J.A. Dowell, J.C. Reubi, J.C. Reubi, J.H. Hubbell, J.J. Carroll, J.J. Carroll, J.J. Carroll, K. Abbas, M.J. Rivard, M.L.P. Antunes, M.S. Dewey, N. Jansen, N. Karavida, O.D. Maslov, P. Neumann-Cosel von, R. Hajima, S. Hassfjell, S.H. Aaaltoma, T. Egidy von, U. Kneissl, U. Köster, V. Bondarenko, V.N. Litvinenko, W. Assmann, W. Ensinger, W.J. Brown, X. Ledoux, Y. Miao, Y.A. Karelin   +53 more
core   +1 more source

Species sensitivity of zeolite minerals for uptake of mercury solutes [PDF]

, 2006
The uptake of inorganic Hg2+ and organometallic CH3Hg+ from aqueous solutions by 11 different natural zeolites has been investigated using a batch distribution coefficient (Kd) method and supported by a preliminary voltammetric study.
A. Chimedtsogzol, A. Dyer, Boudou, Campbell, Cotton, Fergusson, Garcia, L. S. Campbell, Meier, Meyer, Rice, Sersen, Tsitsishvili, Weitkamp   +13 more
core   +2 more sources

Genetic Contribution to Asthma Informs Acute Chest Syndrome Pathophysiology and Risk Stratification

American Journal of Hematology, EarlyView.
ABSTRACT Acute chest syndrome (ACS) is a severe complication of sickle cell disease (SCD) occurring in ~50% of patients, some presenting frequent episodes. We lack tools to identify patients at high risk of ACS occurrence or frequent episodes. Epidemiological studies have found an association between asthma and ACS, but whether this link is causal is ...
Sara El Aouhel, Vanessa Bellegarde, Stennio Da Silva Faria, Tristan St‐Laurent, Estelle Lecluze, Anne‐Laure Pham Hung d’Alexandry d’Orengiani, Frédéric Galactéros, Pablo Bartolucci, Marc‐André Legault, Guillaume Lettre, Thomas Pincez   +10 more
wiley   +1 more source

EFFECT OF LEAD APRONS ON DECREASING THE DOSE REICEIVED BY PERSONNEL IN NUCLEAR MEDICINE DEPARTMENTS

Majallah-i Dānishgāh-i ̒Ulūm-i Pizishkī-i Bābul, 2008
BACKGROUND AND OBJECTIVE: In the nuclear medicine departments, personnel exposure to radiation is inevitable during patient positioning and radiotracer preparation.
K Ghazi Khanlou Sani,, M Momennezhad,, SR Zakavi,, S Sabzevari   +3 more
doaj  

The use of stable Cs and Sr as proxies for the estimation of radionuclide soil-plant transfer factors [PDF]

Ядерна фізика та енергетика
Transfer factors are key inputs for modelling the transport of radionuclides in the environment and for assessment of risk to humans and wildlife. However, for many combinations of soil conditions, plant species (products), and radionuclides, such ...
S. Levchuk, V. Kashparov, V. Morozova, V. Pavliuchenko   +3 more
doaj   +1 more source