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https://www.readbyqxmd.com/read/28231611/leg-vascular-and-skeletal-muscle-mitochondrial-adaptations-to-aerobic-high-intensity-exercise-training-are-enhanced-in-the-early-postmenopausal-phase
#1
Michael Nyberg, Jon Egelund, Camilla M Mandrup, Caroline B Andersen, Karen M B E Hansen, Ida-Marie F Hergel, Nicholai Valbak-Andersen, Ruth Frikke-Schmidt, Bente Stallknecht, Jens Bangsbo, Ylva Hellsten
Exercise training leads to favourable adaptations within skeletal muscle; however, this effect of exercise training may be blunted in postmenopausal women due to the loss of oestrogens. Furthermore, postmenopausal women may have an impaired vascular response to acute exercise. We examined the haemodynamic response to acute exercise in matched pre- and postmenopausal women before and after 12 weeks of aerobic high intensity exercise training. Twenty premenopausal and 16 early postmenopausal (3.1 ± 0.5 [mean ± SEM] years after final menstrual period) women only separated by 4 (50 ± 0 versus 54 ± 1) years of age were included...
February 23, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28231557/comparison-of-body-s-center-of-mass-motion-relative-to-center-of-pressure-between-treadmill-and-over-ground-walking
#2
Hsuan-Lun Lu, Tung-Wu Lu, Hsiu-Chen Lin, Wing P Chan
Treadmills have been used in rehabilitation settings to provide convenient protocols and continuous monitoring of movement over multiple cycles at well-controlled speeds for gait and balance training. However, the potential differences in the movement control may affect the translation of the training outcomes to real life over-ground walking (OW). The similarities and differences in the balance control between treadmill walking (TW) and OW have largely been unexplored. The current study bridged the gap by comparing the motions of the body's center of mass (COM) relative to the center of pressure (COP) between TW and OW, in terms of the COM-COP inclination angle (IA) and its rate of change (RCIA)...
February 9, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28231529/new-enantioselective-lc-method-development-and-validation-for-the-assay-of-modafinil
#3
Marianna Harvanová, Taťána Gondová
For the first time, a new, fast and sensitive chromatographic method for the separation and determination of modafinil enantiomers was developed on chiral stationary phase with macrocyclic glycopeptide teicoplanin in the polar organic mode. The effect of the mobile phase composition and column temperature on the retention and enantioseparation were studied. The separation was performed using a Chirobiotic T column (250×4.6mm, 5μm) with methanol and triethylamine (100/0.05, v/v) as the mobile phase at a flow rate of 1...
February 16, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28231012/quantum-percolation-and-magnetic-nano-droplet-states-in-electronically-phase-separated-manganite-nanowires
#4
Kaixuan Zhang, Lin Li, Hui Li, Qiyuan Feng, Nan Zhang, Long Cheng, Xiaodong Fan, Yubin Hou, Qingyou Lu, Zhenyu Zhang, Changgan Zeng
One-dimensional (1D) confinement has been revealed to effectively tune the properties of materials in homogeneous states. The 1D physics can be further enriched by electronic inhomogeneity, which unfortunately remains largely unknown. Here we demonstrate the ultra-high sensitivity to magnetic fluctuations and the tunability of phase stability in the electronic transport properties of self-assembled electronically phase-separated manganite nanowires with extreme aspect ratio. The onset of magnetic nano-droplet state, a precursor to the ferromagnetic metallic state, is unambiguously revealed, which is attributed to the small lateral size of the nanowires that is comparable to the droplet size...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230757/simultaneous-quantification-of-nine-new-furanocoumarins-in-angelicae-dahuricae-radix-using-ultra-fast-liquid-chromatography-with-tandem-mass-spectrometry
#5
Lei Zhang, Wei Wei, Xiu-Wei Yang
A series of new furanocoumarins with long-chain hydrophobic groups, namely andafocoumarins A-H and J, have been isolated from the dried roots of Angelica dahurica cv. Hangbaizhi (Angelicae Dahuricae radix) in our previous study, among which andafocoumarins A and B were demonstrated to have better anti-inflammatory activity than the positive controls. In this work, a sensitive, accurate, and efficient ultra-fast liquid chromatography coupled with triple quadrupole mass spectrometer (UFLC-MS/MS) method was developed and validated for simultaneous quantification of above-mentioned nine compounds in four cultivars of Angelicae Dahuricae Radix...
February 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230339/simultaneously-enhanced-efficiency-and-stability-of-polymer-solar-cells-by-employing-solvent-additive-and-upside-down-drying-method
#6
Qianqian Sun, Fujun Zhang, Qiaoshi An, Miao Zhang, Xiaoling Ma, Jian Zhang
The morphology of active layer plays an important role in determining the power conversion efficiency (PCE) and stability of polymer solar cells (PSCs), which strongly depends on the dynamic drying process of active layer. In this work, an efficient and universal method was developed to let active layer undergo upside-down drying process in a covered glass petri dish. For the PSCs based on PTB7-Th:PC71BM, the champion PCEs were improved from 8.58% to 9.64% by mixing 3 vol% DIO, further to 10.30% by employing upside-down drying method...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28230323/simultaneous-determination-of-seven-nitrogen-containing-phenyl-ethers-in-cosmetics-by-gas-chromatography-with-mass-spectrometry-and-dispersive-solid-phase-extraction
#7
Jiale Huang, Langjun Zhou, Zhiqing Xun, Qiang Wang, Senyu Lin, Xindong Guo, Yongtong Cai
An analytical method was established for the simultaneous determination of seven nitrogen-containing phenyl ethers (2-anisidine, 3-anisidine, 4-anisidine, 2-nitroanisole, 3-nitroanisole, 4-nitroanisole and 3,3'-dimethoxybenzidine) in cosmetics by gas chromatography with mass spectrometry in this work. The samples were extracted with ethyl acetate and purified with primary secondary amine during the dispersed solid phase extraction. The analytes were separated by a DB-17MS column and detected in the electron ionization mode of mass spectrometry in the selected ions monitoring mode...
February 23, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28230046/gel-phase-formation-in-dilute-triblock-copolyelectrolyte-complexes
#8
Samanvaya Srivastava, Marat Andreev, Adam E Levi, David J Goldfeld, Jun Mao, William T Heller, Vivek M Prabhu, Juan J de Pablo, Matthew V Tirrell
Assembly of oppositely charged triblock copolyelectrolytes into phase-separated gels at low polymer concentrations (<1% by mass) has been observed in scattering experiments and molecular dynamics simulations. Here we show that in contrast to uncharged, amphiphilic block copolymers that form discrete micelles at low concentrations and enter a phase of strongly interacting micelles in a gradual manner with increasing concentration, the formation of a dilute phase of individual micelles is prevented in polyelectrolyte complexation-driven assembly of triblock copolyelectrolytes...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28229392/determination-of-rabeprazole-enantiomers-in-commercial-tablets-using-immobilized-cellulose-based-stationary-phase
#9
Miri Kim, Su Kyung Yu, Quoc-Ky Truong, Xuan-Lan Mai, Hyun Kyu Chung, Jong-Seong Kang, Kyeong Ho Kim
Rabeprazole is one of the latest proton-pump inhibitors used for treatment of several gastrointestinal disorders. For therapeutic applications, rabeprazole has been administered as a mixture of R-(+) and S-(-) enantiomers. Owing to pharmacological and toxicological differences between stereoisomers, chiral recognition has now become an integral part of drug research and development. A simple and rapid liquid chromatographic method for enantioselective separation and determination of R-(+) and S-(-) enantiomers of rabeprazole in bulk drug and pharmaceutical formulations was developed...
February 22, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28229357/experimental-determination-and-theoretical-calculation-of-the-eutectic-composition-of-cefuroxime-axetil-diastereomers
#10
Namita Dalal, Ira S Buckner, Peter L D Wildfong
Cefuroxime axetil (CFA), an ester prodrug of cefuroxime exists as a pair of diastereoemers, namely isomer A and isomer B. To enable phase diagram construction, crystallization of the diastereomers of CFA from the commercially available amorphous drug substance was carried out. Isomer A was separated with a purity approaching 100% whereas the maximum purity of isomer B was 85% as confirmed by solution state proton NMR spectroscopy. The crystalline forms of isomer A and isomer B were confirmed as forms AI and BI, respectively, based on differential scanning calorimetry (DSC) analysis and powder X-ray diffraction...
February 22, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28229356/symptoms-of-swallowing-anxiety-in-panic-disorder-patients-and-associated-psychopathologic-factors
#11
Ersin Budak, İbrahim Taymur, Sinay Önen, Bilgen Biçer Kanat, Önder Akdeniz, Hakan Demirci
AIM: The aim of this study was to investigate symptoms of swallowing difficulty in Panic Disorder (PD) patients and the factors associated with these symptoms. METHODS: In the pre-phase of the study, 22 PD patients who were treated in psychiatry outpatient clinics and who were found to have swallowing difficulty were evaluated. PD patients were asked to write about their thoughts, feelings and behaviors associated with swallowing difficulty. Later, these texts were examined and 41 expressions were identified in which patients described their swallowing difficulty...
February 22, 2017: Eating and Weight Disorders: EWD
https://www.readbyqxmd.com/read/28229237/different-recoveries-of-the-first-and-second-phases-of-the-m-wave-after-intermittent-maximal-voluntary-contractions
#12
Javier Rodriguez-Falces, Nicolas Place
PURPOSE: We investigated the recovery of muscle electrical properties after intermittent intense exercise by examining separately the first and second phases of the muscle compound action potential (M-wave). METHODS: M-waves and mechanical twitches were obtained using femoral nerve stimulation throughout the 30-min recovery period following 48 successive intermittent 3-s MVCs. The amplitude, duration, and area of the M-wave first and second phases, and the peak twitch force were measured from the knee extensors...
February 22, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28228316/gonadotropin-releasing-hormone-analogue-as-sole-luteal-support-in-antagonist-based-assisted-reproductive-technology-cycles
#13
Itai Bar Hava, Moran Blueshtein, Hadas Ganer Herman, Yeela Omer, Gila Ben David
OBJECTIVE: To evaluate the efficacy of GnRH agonists (GnRH-a) as sole luteal phase support in patients undergoing IVF in antagonist-based cycles compared with standard vaginal P preparations. DESIGN: Retrospective cohort. SETTING: Private fertility clinic. PATIENT(S): Patients who underwent antagonist-based cycles performed at our clinic between 2009 and 2015. INTERVENTION(S): Intranasal GnRH-a or vaginal P as luteal support...
January 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28228233/analyzing-complex-mixtures-of-drug-like-molecules-ion-mobility-as-an-adjunct-to-existing-liquid-chromatography-tandem-mass-spectrometry-methods
#14
Jasper Boschmans, Filip Lemière, Frank Sobott
The use of traveling wave ion mobility mass spectrometry (TWIMS) is evaluated in conjunction with, and as a possible alternative to, conventional LC-MS(/MS) methods for the separation and characterization of drug-like compounds and metabolites. As a model system we use an in vitro incubation mixture of the chemotherapeutic agent melphalan, which results in more than ten closely related hydrolysis products and chain-like oligomers. Ion mobility as a filtering tool results in the separation of ions of interest from interfering ions, based on charge state and shape/size...
February 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28228172/experimental-parameters-leading-to-optimal-bilayers-for-total-internal-reflection-fluorescence-microscopy-visualization
#15
Elisabeth Mantil, Trinda Crippin, Anatoli Ianoul, Tyler J Avis
Supported lipid bilayer systems were evaluated following various experimental procedures in an effort to determine their appropriateness for visualization using total internal reflection fluorescence (TIRF) microscopy. The incorporation and distribution of Texas Red® 1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine (TR-DHPE) was studied when incorporated into bilayers of variable lipid composition using different forms of mechanical shearing. Results showed that 0.8 mol% TR-DHPE provides the most optimum TIRF images...
February 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28228036/estimation-of-the-critical-behavior-in-an-active-colloidal-system-with-vicsek-like-interactions
#16
Benjamin Trefz, Jonathan Tammo Siebert, Thomas Speck, Kurt Binder, Peter Virnau
We study numerically the critical behavior of a modified, active Asakura-Oosawa model for colloid-polymer mixtures. The colloids are modeled as self-propelled particles with Vicsek-like interactions. This system undergoes phase separation between a colloid-rich and a polymer-rich phase, whereby the phase diagram depends on the strength of the Vicsek-like interactions. Employing a subsystem-block-density distribution analysis, we determine the critical point and make an attempt to estimate the critical exponents...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28227786/a-tunable-digital-ishihara-plate-for-pre-school-aged-children
#17
Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone, Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone, Ester Minafo, Edoardo Ardizzone, Roberto Pirrone, Orazio Gambino
Colors play a fundamental role for children, both in the everyday life and in education. They recognize the surrounding world, and play games making a large use of colors. They learn letters and numbers by means of colors. As a consequence, early diagnosis of color blindness is an crucial to support an individual affected by this visual perception alteration at the initial phase of his/her life. The diagnosis of red-green color deficiencies (protanopia or deuteranopia) is commonly accomplished by means of the Ishihara test, which consists of plates showing dots with different sizes where some of them compose numbers within a gamut of colors while the ones composing the background have different colors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227423/dynamic-mapping-of-ventricular-function-from-cardiovascular-magnetic-resonance-imaging
#18
Maria Panayiotou, Peter Mountney, Alexander Brost, Daniel Toth, Tom Jackson, Jonathan M Behar, Christopher A Rinaldi, R James Housden, Kawal S Rhode, Maria Panayiotou, Peter Mountney, Alexander Brost, Daniel Toth, Tom Jackson, Jonathan M Behar, Christopher A Rinaldi, R James Housden, Kawal S Rhode, Alexander Brost, Tom Jackson, Maria Panayiotou, Christopher A Rinaldi, Jonathan M Behar, R James Housden, Kawal S Rhode, Daniel Toth, Peter Mountney
Heart failure is associated with substantial mortality and morbidity and remains the most common diagnosis in older patients. Based on experimental electrophysiologic studies, cardiac resynchronization therapy (CRT) for heart failure results in a maximum resynchronization effect when applied to the most delayed left ventricular (LV) site. Current clinical practice is to identify the optimal site using separate visualisation of scar and activation information. These must be mentally mapped into 3D, which is challenging and time-consuming for the electrophysiologist...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227326/detection-of-binaural-interaction-in-free-field-evoked-auditory-brainstem-responses-by-time-scale-representations
#19
Erik Schebsdat, Horst Hessel, Harald Seidler, Daniel J Strauss, Erik Schebsdat, Horst Hessel, Harald Seidler, Daniel J Strauss, Horst Hessel, Erik Schebsdat, Harald Seidler, Daniel J Strauss
The so called β-wave of the binaural interaction component (BIC) in auditory brainstem responses (ABR) has been shown to be an objective measure for binaural interaction (BI). This component is the arithmetical difference between the sum of the monaurally evoked ABRs and the binaurally evoked ABR. Unfortunately, these neural responses are known to be very fragile and as a result the calculated BIC. An additional issue is, that the findings of this measurement are predominantly needed in people with hearing loss who may use hearing devices like hearing aids (HA) or cochlear implants (CI), thus they are not able to use headphones (like in conventional ABR measurements) during the detection of possible BI...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227320/three-dimensional-modeling-of-physiological-tremor-for-hand-held-surgical-robotic-instruments
#20
Sivanagaraja Tatinati, Yan Naing Aye, Anand Pual, Wei Tech Ang, Kalyana C Veluvolu, Sivanagaraja Tatinati, Yan Naing Aye, Anand Pual, Wei Tech Ang, Kalyana C Veluvolu, Sivanagaraja Tatinati, Anand Pual, Wei Tech Ang, Yan Naing Aye, Kalyana C Veluvolu
Hand-held robotic instruments are developed to compensate physiological tremor in real-time while augmenting the required precision and dexterity into normal microsurgical work-flow. The hardware (sensors and actuators) and software (causal linear filters) employed for tremor identification and filtering introduces time-varying unknown phase-delay that adversely affects the device performance. The current techniques that focus on three-dimensions (3D) tip position control involves modeling and canceling the tremor in 3-axes (x, y, and z axes) separately...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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