Results 31 to 40 of about 356,368 (292)

Composite Dipolar Recoupling: Anisotropy Compensated Coherence Transfer in Solid-State NMR [PDF]

, 2006
The efficiency of dipole-dipole coupling driven coherence transfer experiments in solid-state NMR spectroscopy of powder samples is limited by dispersion of the orientation of the internuclear vectors relative to the external magnetic field.
Cindie Kehlet, Navin Khaneja, Niels Chr. Nielsen, Opella S. J., Pontryagin L. S., Steffen J. Glaser   +5 more
core   +1 more source

A 29Si, 1H, and 13C Solid-State NMR Study on the Surface Species of Various Depolymerized Organosiloxanes at Silica Surface

Nanoscale Research Letters, 2019
Three poly(organosiloxanes) (hydromethyl-, dimethyl-, and epoxymethylsiloxane) of different chain lengths and pendant groups and their mixtures of dimethyl (DMC) or diethyl carbonates (DEC) were applied in the modification of fumed silica nanoparticles ...
Iryna S. Protsak, Yevhenii M. Morozov, Wen Dong, Zichun Le, Dong Zhang, Ian M. Henderson   +5 more
doaj   +1 more source

Reorientational Dynamics and Solid-Phase Transformation of Ammonium Dicyanamide into Dicyandiamide [PDF]

, 2007
The reorientational dynamics of ammonium dicyanamide ND4[N(C≡N)2] and the kinetics as well as the mechanism of the solid-state isomerization reaction from ammonium dicyanamide into dicyandiamide (N≡C-N=C(NH2)2) was studied by means of 2H and 14N solid ...
Lotsch, Bettina V., Naumann, Ernst, Schnick, Wolfgang, Senker, Jürgen   +3 more
core   +1 more source

Pseudo-resonance structures in chiral alcohols and amines and their possible aggregation states

Frontiers in Chemistry, 2022
We now report that some chiral compounds, like alcohols, which are not sterically hindered atropisomers nor epimer mixtures, exhibit two sets of simultaneous NMR spectra in CDCl3.
Huajie Zhu, Huajie Zhu, Shengnan Li, Shengnan Li, Yunjing Jia, Juxing Jiang, Feiliu Hu, Longfei Li, Fei Cao, Xiaoke Wang, Shenhui Li, Guanghui Ouyang, Gengfang Tian, Ke Gong, Guangjin Hou, Wei He, Zheng Zhao, Charles U. Pittman, Feng Deng, Minghua Liu, Kai Sun, Ben Zhong Tang   +21 more
doaj   +1 more source

Hydrogen-bonded liquid crystals with broad-range blue phases [PDF]

, 2019
We report a modular supramolecular approach for the investigation of chirality induction in hydrogen-bonded liquid crystals. An exceptionally broad blue phase with a temperature range of 25 °C was found, which enabled its structural investigation by ...
Dautzenberg E., Dong R. Y., Giese M., Michal C. A., Pfletscher M., Saccone M.   +5 more
core   +1 more source

Solid-, Solution-, and Gas-state NMR Monitoring of 13C-Cellulose Degradation in an Anaerobic Microbial Ecosystem

Molecules, 2013
Anaerobic digestion of biomacromolecules in various microbial ecosystems is influenced by the variations in types, qualities, and quantities of chemical components.
Yasuhiro Date, Akira Yamazawa, Jun Kikuchi, Amiu Shino, Tomohiro Iikura   +4 more
doaj   +1 more source

The Solid State \u3csup\u3e13\u3c/sup\u3eC-NMR Spectra of Some Carbides [PDF]

, 1978
The utility of NMR spectroscopy to the study of liquids or solids dissolved in liquids is well known. This technique has been used infrequently to studies in the solid state[I,2]. Work has been done on diamond, graphite and coa113-6].
Haworth, Daniel T., Wilkie, Charles A.
core   +1 more source

Targeting TNBC: core–shell polycationic polyurea dendrimers with inherent anticancer activity

FEBS Open Bio, EarlyView.
Core–shell polycationic PURE dendrimers were tested in TNBC‐derived tumor models. Both formulations selectively targeted TNBC and effectively reduced tumor volume. PUREG4‐OEI48 suppressed tumor growth without detectable toxicity, whereas PUREG4‐OCEI24, despite showing efficacy, induced hepatic toxicity.
Adriana Cruz, Bruna Abreu, Cindy Mendes, Catarina Freitas‐Dias, Filipe Gonçalves, Fernanda Silva, José Ramalho, Saudade André, Vasco D. B. Bonifácio, Jacinta Serpa   +9 more
wiley   +1 more source

Magic angle spinning (MAS) NMR linewidths in the presence of solid-state dynamics [PDF]

, 2008
In solid-state NMR, the magic angle spinning (MAS) technique fails to suppress anisotropic spin interactions fully if reorientational dynamics are present, resulting in a decay of the rotational-echo train in the time-domain signal. We show that a simple
Andrew, Antonijevic, Antonijevic, Ashbrook, Cheng, Conroy, Cutajar, Duer, Edén, Kristensen, Kristensen, Kristensen, Larsen, Lowe, Marica Cutajar, Maricq, Michael J. Thrippleton, Stephen Wimperis, Virlet, Zaremba   +19 more
core   +1 more source

C2α‐carbanion‐protonating glutamate discloses tradeoffs between substrate accommodation and reaction rate in actinobacterial 2‐hydroxyacyl‐CoA lyase

FEBS Open Bio, EarlyView.
Enzymes of the 2‐hydroxyacyl‐CoA lyase group catalyze the condensation of formyl‐CoA with aldehydes or ketones. Thus, by structural adaptation of active sites, practically any pharmaceutically and industrially important 2‐hydroxyacid could be biotechnologically synthesized. Combining crystal structure analysis, active site mutations and kinetic assays,
Michael Zahn, Barbara Seroka, Ryszard Lazny, Zenon Lotowski, Thore Rohwerder   +4 more
wiley   +1 more source