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https://www.readbyqxmd.com/read/28628906/quadrupolar-nutation-nmr-to-discriminate-central-and-satellite-transitions-spectral-assignments-for-a-ziegler-natta-catalyst
#1
E S Merijn Blaakmeer, Wouter M J Franssen, Arno P M Kentgens
In this contribution we used solid state (35)Cl (I=3/2) quadrupolar NMR to study a MgCl2/2,2-dimethyl-1,3-dimethoxypropane (DMDOMe) adduct that serves as a model system for Ziegler-Natta catalysis. Employing large Radio-Frequency (RF) field strengths we observe three spectral features with strongly varying line widths. The assignment of the spectra is complicated because of the large difference in quadrupolar interactions experienced by the different sites in the system. The satellite transitions (ST) of relatively well-defined bulk Cl sites are partially excited and may overlap with the central transition (CT) resonances of more distorted surface sites...
June 7, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28627924/clusters-of-financially-incentivized-chronic-pain-patients-using-the-minnesota-multiphasic-personality-inventory-2-restructured-form-mmpi-2-rf
#2
Luis E Aguerrevere, Matthew R Calamia, Kevin W Greve, Kevin J Bianchini, Kelly L Curtis, Veronica Ramirez
The Minnesota Multiphasic Personality Inventory (MMPI)-2 Restructured Form (MMPI-2-RF) has been shown to have clinical utility in the assessment of individuals with chronic pain (e.g., predicting surgical outcomes). The purpose of this study was to explore the ability of the MMPI-2-RF Validity Scales in profiling patients with chronic pain who had external financial incentive (e.g., workers' compensation claims) and determine the associations between Validity Scale response patterns and important outcomes. Cluster analysis identified 2 similarly sized clusters of patients with very different MMPI-2-RF profiles...
June 19, 2017: Psychological Assessment
https://www.readbyqxmd.com/read/28618858/equivalence-of-laptop-and-tablet-administrations-of-the-minnesota-multiphasic-personality-inventory-2-restructured-form
#3
William H Menton, Adam H Crighton, Anthony M Tarescavage, Ryan J Marek, Adam D Hicks, Yossef S Ben-Porath
The present study investigated the comparability of laptop computer- and tablet-based administration modes for the Minnesota Multiphasic Personality Inventory-2-Restructured Form (MMPI-2-RF). Employing a counterbalanced within-subjects design, the MMPI-2-RF was administered via both modes to a sample of college undergraduates ( N = 133). Administration modes were compared in terms of mean scale scores, internal consistency, test-retest consistency, external validity, and administration time. Mean scores were generally similar, and scores produced via both methods appeared approximately equal in terms of internal consistency and test-retest consistency...
June 1, 2017: Assessment
https://www.readbyqxmd.com/read/28612234/radical-pair-based-magnetoreception-in-birds-radio-frequency-experiments-and-the-role-of-cryptochrome
#4
Christine Nießner, Michael Winklhofer
The radical-pair hypothesis of magnetoreception has gained a lot of momentum, since the flavoprotein cryptochrome was postulated as a structural candidate to host magnetically sensitive chemical reactions. Here, we first discuss behavioral tests using radio-frequency magnetic fields (0.1-10 MHz) to specifically disturb a radical-pair-based avian magnetic compass sense. While disorienting effects of broadband RF magnetic fields have been replicated independently in two competing labs, the effects of monochromatic RF magnetic fields administered at the electronic Larmor frequency (~1...
June 13, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28605130/effect-of-cocoa-s-theobromine-on-intestinal-microbiota-of-rats
#5
Sandra Martín-Peláez, Mariona Camps-Bossacoma, Malen Massot-Cladera, Mar Rigo-Adrover, Àngels Franch, Francisco J Pérez-Cano, Margarida Castell
SCOPE: To establish the role of cocoa theobromine on gut microbiota composition and fermentation products after cocoa consumption in rats. METHODS AND RESULTS: Lewis rats were fed either a standard diet (RF diet), a diet containing 10% cocoa (CC diet) or a diet including 0.25% theobromine (TB diet) for 15 days. Gut microbiota (fluorescence in situ hybridization coupled to flow cytometry and metagenomics analysis), SCFA and IgA-coated bacteria were analyzed in fecal samples...
June 12, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28585334/low-eddy-current-rf-shielding-enclosure-designs-for-3t-mr-applications
#6
Brian J Lee, Ronald D Watkins, Chen-Ming Chang, Craig S Levin
PURPOSE: Magnetic resonance-compatible medical devices operate within the MR environment while benefitting from the superior anatomic information of MRI. Avoiding electromagnetic interference between such instrumentation and the MR system is crucial. In this work, various shielding configurations for positron emission tomography (PET) detectors were studied and analyzed regarding radiofrequency (RF) shielding effectiveness and gradient-induced eddy current performances. However, the results of this work apply to shielding considerations for any MR-compatible devices...
June 6, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28585268/pilot-scale-radio-frequency-blanching-of-potato-cuboids-heating-uniformity
#7
Zhenna Zhang, Chaofan Guo, Tong Gao, Hongfei Fu, Qin Chen, Yunyang Wang
BACKGROUND: Traditional hot water blanching has a slow heat transfer rate, while Radio frequency (RF) heating has the advantages of much faster heating rate and higher penetration depth. In this study, RF heating was applied to improve heating uniformity for the subsequent blanching experiments of potato cuboids. Potato cuboids were treated in a pilot-scale, 27.12 MHz, 6 KW RF heating system under different operating conditions. RESULTS: The dielectric constant increased firstly and then decreased with temperature, whereas loss factor increased as temperature increasing...
June 6, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28584486/estimation-of-guggulsterone-e-and-z-in-the-guggul-based-commercial-formulations-using-high-performance-thin-layer-chromatography
#8
Pramod Kumar Sairkar, Anjana Sharma, N P Shukla
BACKGROUND: Guggulsterone (GS) is a plant steroid and bioactive compound present in gum Guggul of Commiphora wightii. An Indian herbal medicine system "Ayurveda" has a long history of use of gum Guggul and plant extract of C. wightii as medicine for the treatment of various illnesses. Complex nature, low availability, and inconsistency of phytoconstituents make its analysis of difficult tasks. AIMS: In this work, six different Guggul-based herbal formulations were examined for estimation of GS and their isomers (E and Z) through high-performance thin-layer chromatography technique...
January 2017: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/28580581/comparison-of-partial-least-squares-and-random-forests-for-evaluating-relationship-between-phenolics-and-bioactivities-of-neptunia-oleracea
#9
Soo Yee Lee, Ahmed Mediani, Maulidiani, Alfi Khatib, Intan Safinar Ismail, Norhasnida Zawawi, Faridah Abas
BACKGROUND: Neptunia oleracea is a plant consumed as vegetable and used as folk remedy for several diseases. Herein, two regression models (partial least square, PLS and random forest, RF) in metabolomics approach were compared and applied for the evaluation of relationship between phenolics and bioactivities of N. oleracea. In addition, the effects of different extraction conditions on the phenolic constituents were also assessed by pattern recognition analysis. RESULTS: Comparison of the PLS and RF showed that RF exhibited poorer generalization and hence poorer predictive performance...
June 5, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28578493/nailfold-videocapillaroscopy-results-in-patients-with-rheumatoid-arthritis
#10
Sinem Sag, Mustafa Serdar Sag, Ibrahim Tekeoglu, Ayhan Kamanli, Kemal Nas, Yıldıray Aydın
We aimed to analyse the nailfold capillaryscopy findings morphologically and examine their relationship with disease activity and demographic characteristics in patients with rheumatoid arthritis. In accordance with the 2010 ACR/EULAR classification criteria, 201 patients diagnosed with Romatoiad artrit (RA) and 50 healthy controls were included. We analysed capillaroscopic abnormalities such asmegacapillaries, haemorrhages, ramifications and avascular areas in patients affected with rheumatoid arthritis. The findings in our study are as follows: in 45...
June 4, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28576308/mbl2-and-fcn2-gene-polymorphisms-in-a-cohort-of-italian-children-with-rheumatic-fever-a-case-control-study
#11
Valentina Marzetti, Caterina Di Battista, Rossella Ferrante, Leonardo Carlucci, Michela Balsamo, Liborio Stuppia, Giuseppe Lapergola, Ivana Antonucci, Francesco Chiarelli, Luciana Breda
BACKGROUND: Mannose-binding lectins and human ficolins are pattern-recognition proteins involved in innate immunity. A role for MBL2 and FCN2 gene polymorphisms in the pathogenesis of recurrent severe streptococcal infections and rheumatic carditis has been suggested. OBJECTIVES: The aim of this study is to evaluate the presence of MBL2 and FCN2 gene polymorphisms (SNPs) in children with a history of rheumatic fever (RF) and to investigate their possible role in RF clinical presentation and disease course...
April 27, 2017: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/28572773/measuring-ventilatory-activity-with-structured-light-plethysmography-slp-reduces-instrumental-observer-effect-and-preserves-tidal-breathing-variability-in-healthy-and-copd
#12
Marie-Cécile Niérat, Bruno-Pierre Dubé, Claudia Llontop, Agnès Bellocq, Lila Layachi Ben Mohamed, Isabelle Rivals, Christian Straus, Thomas Similowski, Pierantonio Laveneziana
The use of a mouthpiece to measure ventilatory flow with a pneumotachograph (PNT) introduces a major perturbation to breathing ("instrumental/observer effect") and suffices to modify the respiratory behavior. Structured light plethysmography (SLP) is a non-contact method of assessment of breathing pattern during tidal breathing. Firstly, we validated the SLP measurements by comparing timing components of the ventilatory pattern obtained by SLP vs. PNT under the same condition; secondly, we compared SLP to SLP+PNT measurements of breathing pattern to evaluate the disruption of breathing pattern and breathing variability in healthy and COPD subjects...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28569885/experimental-study-on-the-statistic-characteristics-of-a-3x3-rf-mimo-channel-over-a-single-conventional-multimode-fiber
#13
Yi Lei, Jianqiang Li, Rui Wu, Yuting Fan, Songnian Fu, Feifei Yin, Yitang Dai, Kun Xu
Based on the observed random fluctuation phenomenon of speckle pattern across multimode fiber (MMF) facet and received optical power distribution across three output ports, we experimentally investigate the statistic characteristics of a 3×3 radio frequency multiple-input multiple-output (MIMO) channel enabled by mode division multiplexing in a conventional 50 µm MMF using non-mode-selective three-dimensional waveguide photonic lanterns as mode multiplexer and demultiplexer. The impacts of mode coupling on the MIMO channel coefficients, channel matrix, and channel capacity have been analyzed over different fiber lengths...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28569845/combining-phase-images-measured-in-the-radio-frequency-and-the-optical-frequency-ranges
#14
Quang Duc Pham, Yoshio Hayasaki
Phase images measured in the radio frequency (RF) and optical frequency (OF) ranges, whose difference was about 4×10<sup>5</sup>, were combined on the basis of a pattern matching method. RF phase imaging was implemented with an optical frequency-comb femtosecond laser and a single-pixel camera to measure a meter-order depth object with micrometer-order accuracy. OF phase imaging was implemented with an optical interferometer using a low-coherence femtosecond laser pulse to measure the profile with nanometer-order accuracy and high spatial resolution...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28558274/active-control-of-the-spatial-mri-phase-distribution-with-optimal-control-theory
#15
Pauline M Lefebvre, Eric Van Reeth, Hélène Ratiney, Olivier Beuf, Elisabeth Brusseau, Simon A Lambert, Steffen J Glaser, Dominique Sugny, Denis Grenier, Kevin Tse Ve Koon
This paper investigates the use of Optimal Control (OC) theory to design Radio-Frequency (RF) pulses that actively control the spatial distribution of the MRI magnetization phase. The RF pulses are generated through the application of the Pontryagin Maximum Principle and optimized so that the resulting transverse magnetization reproduces various non-trivial and spatial phase patterns. Two different phase patterns are defined and the resulting optimal pulses are tested both numerically with the ODIN MRI simulator and experimentally with an agar gel phantom on a 4...
May 22, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28550740/multi-resolution-classification-of-exhaled-aerosol-images-to-detect-obstructive-lung-diseases-in-small-airways
#16
Jinxiang Xi, Weizhong Zhao, Jiayao Eddie Yuan, Biwei Cao, Linlin Zhao
Exhaled aerosol patterns have been used to detect obstructive respiratory diseases in the upper airways. Signals from small airway diseases are weak and may not manifest themselves in the exhaled aerosol patterns. Therefore, it will be more challenging to detect abnormalities in small airways. The objective of this study is to develop a simulation-based classification model that can accurately classify small airway diseases. The model performance was evaluated in five obstructed models that are located in lung bifurcations G7-9...
May 20, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28536859/accelerated-life-test-methods-and-results-for-implantable-electronic-devices-with-adhesive-encapsulation
#17
Xuechen Huang, Petcharat May Denprasert, Li Zhou, Adriana Nicholson Vest, Sam Kohan, Gerald E Loeb
We have developed and applied new methods to estimate the functional life of miniature, implantable, wireless electronic devices that rely on non-hermetic, adhesive encapsulants such as epoxy. A comb pattern board with a high density of interdigitated electrodes (IDE) could be used to detect incipient failure from water vapor condensation. Inductive coupling of an RF magnetic field was used to provide DC bias and to detect deterioration of an encapsulated comb pattern. Diodes in the implant converted part of the received energy into DC bias on the comb pattern...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28536589/the-role-of-polyphenoloxidase-peroxidase-and-%C3%AE-glucosidase-in-phenolics-accumulation-in-olea-europaea-l-fruits-under-different-water-regimes
#18
Marco Cirilli, Giovanni Caruso, Clizia Gennai, Stefania Urbani, Eleonora Frioni, Maurizio Ruzzi, Maurizio Servili, Riccardo Gucci, Elia Poerio, Rosario Muleo
Olive fruits and oils contain an array of compounds that contribute to their sensory and nutritional properties. Phenolic compounds in virgin oil and olive-derived products have been proven to be highly beneficial for human health, eliciting increasing attention from the food industry and consumers. Although phenolic compounds in olive fruit and oil have been extensively investigated, allowing the identification of the main classes of metabolites and their accumulation patterns, knowledge of the molecular and biochemical mechanisms regulating phenolic metabolism remains scarce...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28528901/responses-to-spatial-contrast-in-the-mouse-suprachiasmatic-nuclei
#19
Joshua W Mouland, Adam R Stinchcombe, Daniel B Forger, Timothy M Brown, Robert J Lucas
A direct retinal projection targets the suprachiasmatic nucleus (SCN) (an important hypothalamic control center). The accepted function of this projection is to convey information about ambient light (irradiance) to synchronize the SCN's endogenous circadian clock with local time and drive the diurnal variations in physiology and behavior [1-4]. Here, we report that it also renders the SCN responsive to visual images. We map spatial receptive fields (RFs) for SCN neurons and find that only a minority are excited (or inhibited) by light from across the scene as expected for irradiance detectors...
June 5, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28526226/experimental-pain-in-the-groin-may-refer-into-the-lower-abdomen-implications-to-clinical-assessments
#20
M K Drew, T S Palsson, R P Hirata, M Izumi, G Lovell, M Welvaert, P Chiarelli, P G Osmotherly, T Graven-Nielsen
OBJECTIVES: To investigate the effects of experimental adductor pain on the pain referral pattern, mechanical sensitivity and muscle activity during common clinical tests. DESIGN: Repeated-measures design. METHODS: In two separate sessions, 15 healthy males received a hypertonic (painful) and isotonic (control) saline injection to either the adductor longus (AL) tendon to produce experimental groin pain or into the rectus femoris (RF) tendon as a painful control...
April 21, 2017: Journal of Science and Medicine in Sport
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