Results 71 to 80 of about 1,224,578 (297)

Experimental study on micro-damage of rock under rheological disturbance

Meitan xuebao
High in-situ stress and mining disturbance will lead to the deformation and instability of deep rock mass. Under the action of high in-situ stress, deep rock mass enters the strength limit neighborhood, and the rock mass entering the strength limit ...
Bo WANG, Yongzheng REN, Zhiyin TIAN, Shiji MA, Jun WANG, Wanpeng HUANG, Ling WANG   +6 more
doaj   +1 more source

Nano- to Millimeter Scale Morphology of Connected and Isolated Porosity in the Permo-Triassic Khuff Formation of Oman

Geosciences, 2019
Carbonate reservoirs form important exploration targets for the oil and gas industry in many parts of the world. This study aims to differentiate and quantify pore types and their relation to petrophysical properties in the Permo-Triassic Khuff Formation,
Jörg Smodej, Laurent Lemmens, Lars Reuning, Thomas Hiller, Norbert Klitzsch, Steven Claes, Peter A. Kukla   +6 more
doaj   +1 more source

Multiple Quantum NMR Dynamics in Dipolar Ordered Spin Systems

, 2007
We investigate analytically and numerically the Multiple Quantum (MQ) NMR dynamics in systems of nuclear spins 1/2 coupled by the dipole-dipole interactions in the case of the dipolar ordered initial state. We suggest two different methods of MQ NMR. One
E. B. Fel’dman, E. I. Kuznetsova, G. B. Furman, M. Goldman, S. D. Goren, S. Emid, S. I. Doronin, S. I. Doronin   +7 more
core   +1 more source

Formation of Stable Amorphous Calcium Phosphate and Collagen Assemblies by a Versatile Spray‐Drying Approach

Advanced Functional Materials, EarlyView.
Amorphous calcium phosphate (ACP) microparticles with long‐term and thermal stability are prepared with or without collagen using a scalable one‐pot spray‐drying process. Under simulated physiological conditions, they crystallize into biomimetic bone mineral and, when combined with collagen, form extrudable, fibrillar bone‐like 3D constructs.
Camila Bussola Tovani, Nessma Bennaceur, Celina Benkhellat, Tristan Georges, Clara Doisneau, Vaskar Sardhalia, Thierry Azaïs, Flora Lemaire, Halima Kerdjoudj, Mohamed Selmane, Capucine Sassoye, Marie Albéric, Cédric Boissière, Nadine Nassif   +13 more
wiley   +1 more source

H NMR Studies of Eukaryotic Cytochrome c [PDF]

, 1982
H NMR resonance assignments in the spectra of horse, tuna, Neurmpora crassa and Candida krusei cyto-chromes c are described. Assignments have been made using NMR double-resonance techniques in conjunction with electron-exchange experiments, spectral ...
Boswell, Campbell, Carrington, Dickerson, Eley, Eley, Ernst, Hoffman, Keller, Keller, Korb, McDonald, Moore, Moore, Moore, Redfield, Stellwagen, Swanson   +17 more
core   +1 more source

SI‐bioATRP in Mesoporous Silica for Size‐Exclusion Driven Local Polymer Placement

Advanced Functional Materials, EarlyView.
An enzyme‐catalyzed surface‐initiated atom transfer radical polymerization (SI‐bioATRP) of an anionic monomer within mesoporous silica particles, using hemoglobin as a catalyst, allows for controlling the location of the formed polymer via size‐exclusion effects between the nanopores and the biomacromolecules, thereby opening routes to functional ...
Oleksandr Wondra, Eleonora Ornati, Robert Lehn, Joanna J. Mikolei, Hergen Breitzke, Raheleh Pardehkhorram, Gerd Buntkowsky, Nico Bruns, Annette Andrieu‐Brunsen   +8 more
wiley   +1 more source

In situ characterization techniques for thermocatalytic CO2 hydrogenation

Discover Chemistry
Direct hydrogenation of CO2 with renewable H2 into value-added chemicals provides a promising pathway for sustainable carbon utilization in the future. Although extensive research has been conducted on CO2 hydrogenation, the complexity of heterogeneous ...
Zekun Hu, Tangkang Liu, Peng Peng, Chen Li, Chuan Qin, Guoliang Liu   +5 more
doaj   +1 more source

Quantitative Determination of Major Active Components in Polymyxin B Medicinal Products by NMR Spectroscopy

Регуляторные исследования и экспертиза лекарственных средств
INTRODUCTION. Polymyxin B is a natural multicomponent antibiotic used in its sulfate form for the treatment of infections caused by multidrug-resistant Gram-negative bacteria. Pharmacopoeial standards for polymyxin B medicinal products include limits for
N. E. Kuz’mina, S. V. Moiseev, I. Yu. Yakupov, S. I. Kuleshova   +3 more
doaj   +1 more source

Detection of Metabolites by Proton Ex Vivo NMR, in Vivo MR Spectroscopy Peaks and Tissue Content Analysis: Biochemical-Magnetic Resonance Correlation: Preliminary Results [PDF]

, 2009
*Aim*: Metabolite concentrations by in vivo magnetic resonance spectroscopy and ex vivo NMR spectroscopy were compared with excised normal human tissue relaxation times and tissue homogenate contents. *Hypothesis*: Biochemical analysis
Arun Agrawala, Madan Rehani, Rakesh Sharma   +2 more
core   +1 more source

First Principles NMR Study of Fluorapatite under Pressure

, 2012
NMR is the technique of election to probe the local properties of materials. Herein we present the results of density functional theory (DFT) \textit{ab initio} calculations of the NMR parameters for fluorapatite (FAp), a calcium orthophosphate mineral ...
Astala, Barbara Pavan, Bengtsson, Braun, Calderin, Chappell, Charpentier, Cheeseman, Comodi, Comodi, Davide Ceresoli, De Leeuw, De Leeuw, Ditchfield, Dorozhkin, Dupree, Gervais, Giannozzi, Harris, Harris, Keith, Kutzelnigg, Laurencin, Le Roux, LeGeros, Liang, Lin, Louis-Achille, Mackenzie, Marco Fornari, Mary M.J. Tecklenburg, Mason, Matsos, Matsukage, Mauri, Momma, Parr, Peeters, Perdew, Peroos, Pickard, Pourpoint, Profeta, Raghavan, Rakovan, Rosin-Grget, Rulis, Sahai, Sardar, Schindler, Shannon, Sudarsan, Tamm, Tribble, Wang, Wellman, Wentzcovitch, Williams, Wong, Wu, Xu, Zahn, Zheng   +62 more
core   +1 more source