Results 71 to 80 of about 58,492 (234)

Biocatalytic Construction of a Chemical Exchange Saturation Transfer Magnetic Resonance Imaging Nucleoside Probe: Synthesis and Evaluation of 5‐Methyl‐5,6‐Dihydrothymidine

Advanced Synthesis &Catalysis, EarlyView.
Al‐Hilfi et al. present a biocatalytic strategy for synthesizing 5‐methyl‐5,6‐dihydrothymidine (5‐MDHT), a sensitive MRI contrast agent. The study demonstrates that recombinant enzyme catalysis offers an efficient, sustainable, and eco‐friendly alternative to traditional chemical synthesis for producing clinically relevant imaging probes.
Aimen Al‐Hilfi, E. Alejandro Castellanos Franco, Connor J. Grady, Zinia Mohanta, Michael T. McMahon, Milana Bazayeva, Zhen Li, Kenneth M. Merz Jr., Assaf A. Gilad   +8 more
wiley   +1 more source

Observation of a shape resonance of the positronium negative ion

Nature Communications, 2016
The Positronium negative ion is formed by two electrons bound to a positron, and experimental investigations of its states and energy levels are difficult due to its short lifetime.
Koji Michishio, Tsuneto Kanai, Susumu Kuma, Toshiyuki Azuma, Ken Wada, Izumi Mochizuki, Toshio Hyodo, Akira Yagishita, Yasuyuki Nagashima   +8 more
doaj   +1 more source

Distribution of Positron Annihilation Lifetime Components

مجلة بغداد للعلوم, 2008
The intensities of the positron annihilation lifetime components are shown to be related to the free volume model, and the theoretical value of the ratio between the singlet to the triplet state intensities, described by the ratio η, is shown to follow ...
Ahmed Abdul-Razzaq Selman, Muna Ahmed Saeed   +1 more
doaj   +1 more source

Application Progress of PALS in the Correlation of Structure and Properties for Graphene/Polymer Nanocomposites

Nanomaterials, 2022
Giving a deep insight into the microstructure, and realizing the correlation between microstructure and properties is very important to the precise construction of high-performance graphene/polymer nanocomposites (GPN).
Xiaobing Han, Jie Gao, Tao Chen, Libing Qian, Houhua Xiong, Zhiyuan Chen   +5 more
doaj   +1 more source

Structural Defects in TiNi-Based Alloys after Warm ECAP

Metals, 2020
The microstructure, martensitic transformations and crystal structure defects in the Ti50Ni47.3Fe2.7 (at%) alloy after equal-channel angular pressing (ECAP, angle 90°, route BC, 1–3 passes at T = 723 K) have been investigated.
Aleksandr Lotkov, Anatoly Baturin, Vladimir Kopylov, Victor Grishkov, Roman Laptev   +4 more
doaj   +1 more source

Stability of vacancies in β-type Ti-15Mo-5Zr-3Al alloy fabricated via laser powder bed fusion

Additive Manufacturing Letters, 2023
The structural instability in the β-type titanium alloys could affect the stability of vacancies. The stability of vacancies in a β-type Ti-15Mo-5Zr-3Al alloy, fabricated via laser powder bed fusion (LPBF), was investigated using positron annihilation ...
Masataka Mizuno, Kazuki Sugita, Kousuke Do, Takuya Ishimoto, Takayoshi Nakano, Hideki Araki   +5 more
doaj   +1 more source

Searching for annihilation radiation from SN 1006 with SPI on INTEGRAL [PDF]

, 2006
Historical Type Ia supernovae are a leading candidate for the source of positrons observed through their diffuse annihilation emission in the Galaxy.
E. Kalemci, Milne D. K., P. A. Milne, S. E. Boggs, S. P. Reynolds   +4 more
core   +2 more sources

Effect of Dissolved Hydrogen on Polyamide 11: Observation During Hydrogen Desorption Process After Decompression at Atmospheric Pressure

Journal of Applied Polymer Science, EarlyView.
Dissolved hydrogen‐induced plasticization of polyamide 11 (PA11) detected as a decrease in flexural modulus (Ef) using Cyclic Three‐Point Bending (Cyc‐3PB). ABSTRACT The effect of dissolved hydrogen on polyamide 11 (PA11) after decompression from a 90 MPa hydrogen gas environment was investigated. Structural analyses using wide‐angle X‐ray diffraction (
Hiroaki Ono, Youhei Fujii, Shunsuke Nagano, Masahiro Kasai, Keiko Ohyama, Hirotada Fujiwara, Shin Nishimura   +6 more
wiley   +1 more source

INTEGRAL and Nuclear Astrophysics [PDF]

, 2001
We briefly review the fundamentals of nuclear gamma-ray line astronomy (radioactive astronomy), focusing on its role to decipher the intimate physics of supernovae, either immediatly (via $^{56}Co)$ or after a time delay (via $^{44}Ti$).
Casse, Michel, Paul, Jacques, Vangioni-Flam, Elisabeth   +2 more
core   +2 more sources

Catalytic Activity of Cobalt Ferrites in Water Oxidation Reactions and Its Defect Dependency

ChemCatChem, EarlyView.
Cobalt ferrite spinels calcined at 400–600 °C show temperature‐dependent changes in crystallinity, particle size, and defect concentration. A combination of PXRD, BET, SEM, Mössbauer spectroscopy, magnetometry, and PALS reveals how defect landscapes govern opposing trends in chemical versus electrochemical water oxidation.
Anna Rabe, Ahmed Gamal Attallah, Benedikt Eggert, Eric Hirschmann, Soma Salamon, Joachim Landers, Lea Kämmerer, Nicolas Cosanne, Adarsh Koul, Eko Budiyanto, Wolfgang Schuhmann, Malte Behrens, Heiko Wende   +12 more
wiley   +1 more source