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https://www.readbyqxmd.com/read/29335163/n-n-diethylmethylamine-as-lineshape-standard-for-nmr-above-130%C3%A2-k
#1
Keith J Fritzsching, Boris Itin, Ann E McDermott
We demonstrate that N,N-Diethylmethylamine (DEMA) is a useful compound for shimming the magnetic field when doing NMR experiments at room temperature and 130 K, near the temperature used in many dynamic nuclear polarization (DNP) experiments. The resonance assigned to the N-methyl carbon in DEMA at 14.7 T and 140 K has a full-width-half-max linewidth of <4 Hz and has a spin-lattice relaxation time of 0.17 ± 0.03 s.
December 30, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29334381/the-molecular-basis-of-subtype-selectivity-of-human-kinin-g-protein-coupled-receptors
#2
Lisa Joedicke, Jiafei Mao, Georg Kuenze, Christoph Reinhart, Tejaswi Kalavacherla, Hendrik R A Jonker, Christian Richter, Harald Schwalbe, Jens Meiler, Julia Preu, Hartmut Michel, Clemens Glaubitz
G-protein-coupled receptors (GPCRs) are the most important signal transducers in higher eukaryotes. Despite considerable progress, the molecular basis of subtype-specific ligand selectivity, especially for peptide receptors, remains unknown. Here, by integrating DNP-enhanced solid-state NMR spectroscopy with advanced molecular modeling and docking, the mechanism of the subtype selectivity of human bradykinin receptors for their peptide agonists has been resolved. The conserved middle segments of the bound peptides show distinct conformations that result in different presentations of their N and C termini toward their receptors...
January 15, 2018: Nature Chemical Biology
https://www.readbyqxmd.com/read/29332384/structure-of-lipid-nanoparticles-containing-sirna-or-mrna-by-dynamic-nuclear-polarization-enhanced-nmr-spectroscopy
#3
Jasmine Viger-Gravel, Anna Schantz, Arthur C Pinon, Aaron J Rossini, Staffan Schantz, Lyndon Emsley
Here we show how dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) spectroscopy experiments permit the atomic level structural characterization of loaded and empty lipid nanoparticles (LNPs). The LNPs used here were synthesized by microfluidic mixing technique and are composed of ionizable cationic lipid (DLin-MC3-DMA), a phospholipid (DSPC), cholesterol and PEG (DMPE-PEG 2000), as well as encapsulated cargoes which are either phosphorothioated-siRNA (50 or 100%) or mRNA. We show that LNPs form physically stable complexes with bioactive drug siRNA for a period of 94 days...
January 14, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29331928/being-in-control-a-thematic-content-analysis-of-14-in-depth-interviews-with-2-4-dinitrophenol-users
#4
Neha Prasad Ainsworth, Elisabeth Julie Vargo, Andrea Petróczi
BACKGROUND: 2,4-Dinitrophenol (2,4-DNP) is a compound with multiple industrial purposes. Currently unlicensed for human consumption, it is used by the gym-going population for drastic, short-term body fat loss. Nonetheless, physiological mechanisms can lead to potentially fatal hyperthermia. Reported fatal incidents have caused concern and highlighted the need for intervention. Understanding decision-making leading to 2,4-DNP use alongside the perceived outgroup attitudes is vital to forming effective harm minimisation policies targeting current and potential users...
January 11, 2018: International Journal on Drug Policy
https://www.readbyqxmd.com/read/29317503/er-stress-mobilization-of-death-associated-protein-kinase-1-dependent-xenophagy-counteracts-mitochondria-stress-induced-epithelial-barrier-dysfunction
#5
Fernando Lopes, Åsa V Keita, Alpana Saxena, Jose Luis Reyes, Nicole Mancini, Ala Al Rajabi, Arthur Wang, Cristiane Baggio, Michael Dicay, Rob van Dalen, Younghee Ahn, Matheus Carneiro, Nathan Peters, Jong M Rho, Wallace MacNaughton, Stephan E Girardin, Humberto Jijon, Dana J Philpott, Johan D Söderholm, Derek M McKay
The gut microbiome contributes to inflammatory bowel disease (IBD), in which bacteria can be present within the epithelium. Epithelial barrier function is decreased in IBD, and dysfunctional epithelial mitochondria and endoplasmic reticulum (ER) stress have been individually associated with IBD. We therefore hypothesized that the combination of ER and mitochondrial stresses significantly disrupt epithelial barrier function. Here, we treated human colonic biopsies, epithelial colonoids, and epithelial cells with an uncoupler of oxidative phosphorylation, dinitrophenol (DNP), with or without the ER stressor tunicamycin, and assessed epithelial barrier function by monitoring internalization and translocation of commensal bacteria...
January 9, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29315908/sub-minute-kinetics-of-human-red-cell-fumarase-1-h-spin-echo-nmr-spectroscopy-and-13-c-rapid-dissolution-dynamic-nuclear-polarization
#6
Dmitry Shishmarev, Alan J Wright, Tiago B Rodrigues, Giuseppe Pileio, Gabriele Stevanato, Kevin M Brindle, Philip W Kuchel
Fumarate is an important probe of metabolism in hyperpolarized magnetic resonance imaging and spectroscopy. It is used to detect the release of fumarase in cancer tissues, which is associated with necrosis and drug treatment. Nevertheless, there are limited reports describing the detailed kinetic studies of this enzyme in various cells and tissues. Thus, we aimed to evaluate the sub-minute kinetics of human red blood cell fumarase using nuclear magnetic resonance (NMR) spectroscopy, and to provide a quantitative description of the enzyme that is relevant to the use of fumarate as a probe of cell rupture...
January 8, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29314217/direct-assessment-of-renal-mitochondrial-redox-state-using-hyperpolarized-13-c-acetoacetate
#7
Cornelius von Morze, Michael A Ohliger, Irene Marco-Rius, David M Wilson, Robert R Flavell, David Pearce, Daniel B Vigneron, John Kurhanewicz, Zhen J Wang
PURPOSE: The purpose of this study was to investigate the hyperpolarized ketone body 13 C-acetoacetate (AcAc) and its conversion to 13 C-β-hydroxybutyrate (βOHB) in vivo, catalyzed by β-hydroxybutyrate dehydrogenase (BDH), as a novel direct marker of mitochondrial redox state. METHODS: [1,3-13 C2 ]AcAc was synthesized by hydrolysis of the ethyl ester, and hyperpolarized via dissolution DNP. Cold storage under basic conditions resulted in sufficient chemical stability for use in hyperpolarized (HP) MRI studies...
January 3, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29308713/an-enhanced-cultural-competence-curriculum-and-changes-in-transcultural-self-efficacy-in-doctor-of-nursing-practice-students
#8
Joanne K Singleton
PURPOSE: The Doctor of Nursing Practice (DNP) degree is the most advanced clinical leadership role in nursing. Curricula prepare these students to design, implement, evaluate, and continuously improve high-quality culturally specific health care delivery and outcomes. DESIGN: Guided by the cultural competence and confidence model, the Transcultural Self-Efficacy Tool was used to assess the impact of an enhanced cultural competence curriculum on transcultural self-efficacy perceptions of DNP students ( n = 54)...
September 2017: Journal of Transcultural Nursing: Official Journal of the Transcultural Nursing Society
https://www.readbyqxmd.com/read/29291256/rational-design-of-13c-d14-tert-butylbenzene-as-a-scaffold-structure-for-designing-long-lived-hyperpolarized-13c-probes
#9
Yuki Imakura, Hiroshi Nonaka, Yoichi Takakusagi, Kazuhiro Ichikawa, Nesmine Maptue, Alexander Funk, Chalermchai Khemtong, Shinsuke Sando
Dynamic nuclear polarization (DNP) is a technique to polarize the nuclear spin population. As a result of the hyperpolarization, NMR sensitivity of the nuclei in molecules can be enhanced dramatically. Recent application of the hyperpolarization technique has led to advances in biochemical and molecular studies. A major problem is the short lifetime of the polarized nuclear spin state. Generally, in solution, the polarized nuclear spin state decays to a thermal spin equilibrium, resulting in loss of the enhanced NMR signal...
December 31, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29287183/electronic-properties-of-dna-description-of-weak-interactions-in-tata-box-like-chains
#10
Jorge Gutiérrez-Flores, Estrella Ramos, Carlos I Mendoza, Enrique Hernández-Lemus
DNA is one of the most important biomolecules since it contains all the genetic information about an organism. The tridimensional structure of DNA is a determinant factor that influences the physiological and biochemical mechanisms by which this molecule carries out its biological functions. It is believed that hydrogen bonds and π-π stacking are the most relevant non-covalent interactions regarding DNA stability. Due to its importance, several theoretical works have been made to describe these interactions, however, most of them often consider only the presence of two nitrogenous bases, having a limited overview of the participation of these in B-DNA stabilization...
December 12, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/29276403/thermal-camera-as-a-pain-monitor
#11
Varlik K Erel, Heval Selman Özkan
Objectives: Today, many subjective methods are used to measure pain. Wong Baker and Hicks Facial Pain Scale is one of the most commonly used method. Clinicians grade pain according to the facial mimetic reaction of the patient. Unfortunately, there is no objective measure for monitoring pain. By using the same principle of the Wong Baker and Hicks Facial Pain Scale, in this study, we aimed to objectively measure pain by using a thermal camera to detect instant facial temperature changes...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/29274172/dissemination-of-scholarship-across-eight-cohorts-of-doctor-of-nursing-practice-graduates
#12
Kathleen D Becker, Shania Johnson, Denise Rucker, Deborah S Finnell
AIMS AND OBJECTIVES: The aim of this investigation was to evaluate the publication record across eight cohorts of post-master's Doctor of Nursing Practice (DNP) graduates. BACKGROUND: Dissemination of findings from evidence-based practice is described in the American Association of the Colleges of Nursing (AACN), Doctor of Nursing Practice (DNP) Essential III. Students in DNP programs are expected to generate deliverables (e.g., a manuscript) of evidence to improve practice or patient outcomes...
December 23, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/29246805/substrate-specificity-profiling-of-m32-metallocarboxypeptidases-from-trypanosoma-cruzi-and-trypanosoma-brucei
#13
Alejandra P Frasch, León A Bouvier, Florencia M Oppenheimer, Maria Aparecida Juliano, Luiz Juliano, Adriana K Carmona, Juan José Cazzulo, Gabriela T Niemirowicz
Metallocarboxypeptidases (MCPs) of the M32 family, while broadly distributed among prokaryotic organisms, have so far been only found in a few eukaryotes including trypanosomatids. Among these organisms are human and animal pathogens of medical relevance such as Trypanosoma brucei and Trypanosoma cruzi, the respective causative agents of sleeping sickness and Chagas disease. The M32 MCP orthologues found in these parasites share 72% protein sequence identity. They also present a cytosolic localization, a similar pattern of expression and a marked preference for Arg/Lys residues at P1'...
December 12, 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/29245100/student-motivation-stressors-and-intent-to-leave-nursing-doctoral-study-a-national-study-using-path-analysis
#14
Delene Volkert, Lori Candela, Matthew Bernacki
BACKGROUND: The demand for doctorally prepared nurses worldwide is higher than ever. Universities have responded with increased numbers of DNP and Ph.D. in Nursing programs. There are more doctoral nursing students than ever before yet they remain one of the least studied student populations. This is concerning given the high attrition rates reported in doctoral programs. The few studies that do exist are typically qualitative and exploratory in nature. OBJECTIVES: The aim of this national study of Ph...
December 6, 2017: Nurse Education Today
https://www.readbyqxmd.com/read/29242884/the-effect-of-ho3-doping-on-13c-dynamic-nuclear-polarization-at-5-t
#15
Ali A Sirusi, Eul Hyun Suh, Zoltan Kovacs, Matthew E Merritt
Dissolution dynamic nuclear polarization was introduced in 2003 as a method for producing hyperpolarized 13C solutions suitable for metabolic imaging. The signal to noise ratio for the imaging experiment depends on the maximum polarization achieved in the solid state. Hence, optimization of the DNP conditions is essential. To acquire maximum polarization many parameters related to sample preparation can be modulated. Recently, it was demonstrated that Ho3+, Dy3+, Tb3+, and Gd3+ complexes enhance the polarization at 1...
December 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29234484/determining-the-surface-structure-of-silicated-alumina-catalysts-via-isotopic-enrichment-and-dynamic-nuclear-polarization-surface-enhanced-nmr-spectroscopy
#16
Andrew G M Rankin, Paul B Webb, Daniel M Dawson, Jasmine Viger-Gravel, Brennan J Walder, Lyndon Emsley, Sharon E Ashbrook
Isotopic enrichment of 29Si and DNP-enhanced NMR spectroscopy are combined to determine the detailed surface structure of a silicated alumina catalyst. The significant sensitivity enhancement provided by DNP is vital to the acquisition of multinuclear and multidimensional experiments that provide information on the atomic-level structure of the species present at the surface. Isotopic enrichment not only facilitates spectral acquisition, particularly given the low (1.5 wt %) Si loading, but also enables spectra with higher resolution than those acquired using DNP to be obtained...
October 19, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/29230541/theoretical-and-experimental-investigation-into-a-eutectic-system-of-3-4-dinitropyrazole-and-1-methyl-3-4-5-trinitropyrazole
#17
Shuang-Fei Zhu, Shu-Hai Zhang, Rui-Jun Gou, Fu-de Ren
Eutectic mixtures of 3,4-dinitropyrazole (DNP) and 1-methyl-3,4,5-trinitropyrazole (MTNP) were investigated by theoretical and experimental methods. The mass ratio of DNP and MTNP ranged from 0:100 to 100:0. Melting points of the mixtures were predicted through observing the inflection point of a specific volume vs. temperature in molecular dynamics (MD) simulation. The results are in good agreement with experimental results obtained from the differential scanning calorimeter (DSC) study. The binding energy of a 50/50 DNP/MTNP eutectic mixture is lower than those of other mixtures, in accordance with the common sense that the melting point of materials is linked to the strength of intermolecular interactions...
December 11, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29227628/metabolic-measurements-of-non-permeating-compounds-in-live-cells-using-hyperpolarized-nmr
#18
Mengxiao Liu, Christian Hilty
Hyperpolarization by dissolution dynamic nuclear polarization (D-DNP) has emerged as a technique for enhancing NMR signals by several orders of magnitude, thereby facilitating the characterization of metabolic pathways both in vivo and in vitro. Following the introduction of an externally hyperpolarized compound, real-time NMR enables the measurement of metabolic flux in the corresponding pathway. Spin relaxation however limits the maximum experimental time and prevents the use of this method with compounds exhibiting slow membrane transport rates...
December 11, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29226471/a-human-study-to-evaluate-safety-tolerability-and-cyclic-gmp-activating-properties-of-cenderitide-in-subjects-with-stable-chronic-heart-failure
#19
Rika Kawakami, Candace Y W Lee, Christopher Scott, Kent R Bailey, John A Schirger, Horng H Chen, Sherry L Benike, Valentina Cannone, Fernando L Martin, S Jeson Sangaralingham, Tomoko Ichiki, John C Burnett
Cenderitide is a novel designer natriuretic peptide (NP) composed of C-type natriuretic peptide (CNP) fused to the C-terminus of Dendroaspis natriuretic peptide (DNP). Cenderitide was engineered to co-activate the two NP receptors, particulate guanylyl cyclase (pGC)-A and -B. The rationale for its design was to achieve the renal-enhancing and anti-fibrotic properties of dual receptor activation, but without clinically significant hypotension. Here, we report the first clinical trial on the safety, tolerability and cyclic guanosine monophosphate (cGMP) activating properties of Cenderitide in subjects with stable HF...
December 11, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29226164/short-term-outcomes-following-concussion-in-the-nfl-a-study-of-player-longevity-performance-and-financial-loss
#20
Sergio M Navarro, Olumide F Sokunbi, Heather S Haeberle, Mark S Schickendantz, Michael A Mont, Richard A Figler, Prem N Ramkumar
Background: A short-term protocol for evaluation of National Football League (NFL) athletes incurring concussion has yet to be fully defined and framed in the context of the short-term potential team and career longevity, financial risk, and performance. Purpose: To compare the short-term career outcomes for NFL players with concussions by analyzing the effect of concussions on (1) franchise release rate, (2) career length, (3) salary, and (4) performance. Study Design: Cohort study; Level of evidence, 3...
November 2017: Orthopaedic Journal of Sports Medicine
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