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https://www.readbyqxmd.com/read/28822347/screening-and-confirmation-of-steroids-and-nitroimidazoles-in-urine-blood-and-food-matrices-sample-preparation-methods-and-liquid-chromatography-tandem-mass-spectrometric-separations
#1
Ádám Tölgyesi, Enikő Barta, Andrea Simon, Thomas J McDonald, Virender K Sharma
Veterinary drugs containing synthetic anabolic steroid and nitroimidazole active agents are not allowed for their applications in livestock of the European Union (EU). This paper presents analyses of twelve selected steroids and six nitroimidazole antibiotics at low levels (1.56μg/L-4.95μg/L and 0.17μg/kg-2.14μg/kg, respectively) in body fluids and egg incurred samples. Analyses involved clean-up procedures, high performance liquid chromatography (HPLC) separation, and tandem mass spectrometric screening and confirmatory methods...
August 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28822284/the-comparison-of-chemical-liquid-deposition-and-acid-dealumination-modified-zsm-5-for-catalytic-pyrolysis-of-pinewood-using-pyrolysis-gas-chromatography-mass-spectrometry
#2
Huiyan Zhang, Shanshan Shao, Mengmeng Luo, Rui Xiao
Catalyst deactivation is the main reason for low petrochemical yield in catalytic fast pyrolysis (CFP) of biomass. ZSM-5 catalysts modified by chemical liquid deposition (CLD) and acid dealumination (AD) were prepared to improve petrochemical yields for CFP of pinewood. The results showed that CLD by SiO2 led to the coverage of strong acid sites, while AD favored the removal of superficial acid sites. CFP of pinewood showed that the relative area ratio of BTX was boosted by 37.2% and 30.4% over modified ZSM-5 catalysts by CLD and AD, respectively...
August 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28822245/sensitive-fluorescence-on-off-probes-for-the-fast-detection-of-a-chemical-warfare-agent-mimic
#3
Muhammad Shar Jhahan Khan, Ya-Wen Wang, Mathias O Senge, Yu Peng
Two highly sensitive probes bearing a nucleophilic imine moiety have been utilized for the selective detection of chemical warfare agent (CWA) mimics. Diethyl chlorophosphate (DCP) was used as mimic CWAs. Both iminocoumarin-benzothiazole-based probes not only demonstrated a remarkable fluorescence ON-OFF response and good recognition, but also exhibited fast response times (10s) along with color changes upon addition of DCP. Limits of detection for the two sensors 1 and 2 were calculated as 0.065μM and 0.21μM, respectively, which are much lower than most other reported probes...
August 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822184/-analyzing-crude-processed-root-of-polygonum-multiflorum-from-different-habitats-by-uplc-fingerprint-and-mode-identification-methods
#4
Rong Xiao, Yan Lin, Si-Min Lei, Ying Zhang, Jie Huang, Bo-Hou Xia, Chun Li, Duan-Fang Liao, Ping Wu, Li-Mei Lin
To establish a content determination method for 2,3,5,4'-tetrahydroxy stilbene-2-O-β-D-glucoside (TSG) of the crude/processed root of Polygonum multiflorum from different habitats in China and set up the fingerprint by using UPLC. Various samples were pretreated by macro-porous resin. Then UPLC analysis was performed on Waters ACQUITY UPLC@BEH C18 chromatographic column (2.1 mm×50 mm, 1.7 μm) at (25±5) ℃. A binary gradient elution system was composed of acetonitrile (phase A) and 0.5% acetic acid solution (phase B)...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822158/-fast-identification-of-constituents-of-lagotis-brevituba-by-using-uplc-q-tof-ms-ms-method
#5
Jing Xie, Li Zhang, Jin-Xiang Zeng, Min Li, Juan Wang, Xiong-Xiong Xie, Guo-Yue Zhong, Guang-Ming Luo, Jin-Bin Yuan, Jian Liang
The chemical constituents of Lagotis brevituba were rapidly determined and analyzed by using ultra performance liquid chromatography tandem quadrupole time of flight mass spectrometry (UPLC-Q-TOF-MS/MS) method, providing material basis for the clinical application of L. brevituba. The separation was performed on UPLC YMC-Triart C₁₈ (2.1 mm×100 mm, 1.9 μm) column, with acetonitrile-water containing 0.2% formic acid as mobile phase for gradient elution. The flow rate was 0.4 mL•min-1 gradient elution and column temperature was 40 ℃, the injection volume was 2 μL...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822077/increased-serum-levels-of-fetuin-b-in-patients-with-coronary-artery-disease
#6
Kefu Zhu, Yuming Wang, Pengqin Shu, Qinyi Zhou, Jinzhou Zhu, Wenjing Zhou, Changqing Du, Chenkai Xu, Xiaowei Liu, Lijiang Tang
BACKGROUND: Recent evidence indicates a pivotal role for fetuin B, one of the cystatin superfamily of cysteine protease inhibitors, in the pathogenesis of metabolic diseases. This study investigated whether serum fetuin B levels are associated with the presence of coronary artery disease. METHODS: Serum fetuin B levels were assessed in 87 patients with coronary artery disease (41 with acute coronary syndromes and 46 with stable angina pectoris) and 87 healthy controls using an enzyme-linked immunosorbent assay...
August 19, 2017: Endocrine
https://www.readbyqxmd.com/read/28822000/effects-of-fusariotoxin-co-exposure-on-thp-1-human-immune-cells
#7
Marie-Caroline Smith, Stéphanie Madec, Samuel Troadec, Emmanuel Coton, Nolwenn Hymery
Deoxynivalenol (DON), nivalenol (NIV), T-2 toxin (T2), fumonisin B1 (FB1), zearalenone (ZEA), and moniliformin (MON) mycotoxins are common food and feed contaminants produced by Fusarium spp. However, while they are usually found to co-occur in a large range of commodities, only few data are available on mycotoxin co-exposure effects and cellular response mechanisms. In this study, the individual and combined toxic effects of these fusariotoxins were evaluated on the THP-1 human immune cell line as major fusariotoxins are mostly potent immunomodulators...
August 18, 2017: Cell Biology and Toxicology
https://www.readbyqxmd.com/read/28821929/magnetic-resonance-cinematography-of-the-fingers-a-3-0-tesla-feasibility-study-with-comparison-of-incremental-and-continuous-dynamic-protocols
#8
Thomas Bayer, Werner Adler, Rolf Janka, Michael Uder, Frank Roemer
OBJECTIVE: To study the feasibility of magnetic resonance cinematography of the fingers (MRCF) with comparison of image quality of different protocols for depicting the finger anatomy during motion. MATERIALS AND METHODS: MRCF was performed during a full flexion and extension movement in 14 healthy volunteers using a finger-gating device. Three real-time sequences (frame rates 17-59 images/min) and one proton density (PD) sequence (3 images/min) were acquired during incremental and continuous motion...
August 19, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28821878/shock-formation-and-structure-in-magnetic-reconnection-with-a-streaming-flow
#9
Liangneng Wu, Zhiwei Ma, Haowei Zhang
The features of magnetic reconnection with a streaming flow have been investigated on the basis of compressible resistive magnetohydrodynamic (MHD) model. The super-Alfvenic streaming flow largely enhances magnetic reconnection. The maximum reconnection rate is almost four times larger with super-Alfvenic streaming flow than sub-Alfvénic streaming flow. In the nonlinear stage, it is found that there is a pair of shocks observed in the inflow region, which are manifested to be slow shocks for sub-Alfvénic streaming flow, and fast shocks for super-Alfvénic streaming flow...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821856/smoking-obstructive-sleep-apnea-syndrome-and-their-combined-effects-on-metabolic-parameters-evidence-from-a-large-cross-sectional-study
#10
Huaming Zhu, Huajun Xu, Rui Chen, Suru Liu, Yunyan Xia, Yiqun Fu, Xinyi Li, Yingjun Qian, Jianyin Zou, Hongliang Yi, Jian Guan
Metabolic disorders have been separately associated with obstructive sleep apnea syndrome (OSAS) and smoking. However, no study has examined their interactions with metabolic parameters, including insulin resistance and dyslipidemia. To investigate whether the combination of OSAS and smoking results in an additive detriment in metabolic disorder parameters, we enrolled consecutive adult men during 2014-2015. Fasted blood samples were taken to determine glucose, insulin, and lipid levels. A questionnaire including an item on smoking pack-year exposure was administered, and the Epworth Sleepiness Scale and overnight polysomnography were performed...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821805/transmission-zone-plates-as-analyzers-for-efficient-parallel-2d-rixs-mapping
#11
Felix Marschall, Zhong Yin, Jens Rehanek, Martin Beye, Florian Döring, Katharina Kubiček, Dirk Raiser, Sreevidya Thekku Veedu, Jens Buck, André Rothkirch, Benedikt Rösner, Vitaliy A Guzenko, Jens Viefhaus, Christian David, Simone Techert
We have implemented and successfully tested an off-axis transmission Fresnel zone plate as spectral analyzer for resonant inelastic X-ray scattering (RIXS). The imaging capabilities of zone plates allow for advanced two-dimensional (2D) mapping applications. By varying the photon energy along a line focus on the sample, we were able to simultaneously record the emission spectra over a range of excitation energies. Moreover, by scanning a line focus across the sample in one dimension, we efficiently recorded RIXS spectra spatially resolved in 2D, increasing the throughput by two orders of magnitude...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821796/cathepsin-k-knockout-protects-against-cardiac-dysfunction-in-diabetic-mice
#12
Rui Guo, Yinan Hua, Olivia Rogers, Travis E Brown, Jun Ren, Sreejayan Nair
Diabetes is a major risk factor for cardiovascular disease and the lysosomal cysteine protease cathepsin K plays a critical role in cardiac pathophysiology. To expand upon our previous findings, we tested the hypothesis that, knockout of cathepsin K protects against diabetes-associated cardiac anomalies. Wild-type and cathepsin K knockout mice were rendered diabetic by streptozotocin (STZ) injections. Body weight, organ mass, fasting blood glucose, energy expenditure, cardiac geometry and function, cardiac histomorphology, glutathione levels and protein levels of cathepsin K and those associated with Ca(2+) handling, calcineurin/NFAT signaling, insulin signaling, cardiac apoptosis and fibrosis were determined...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821773/a-patterned-single-layer-graphene-resistance-temperature-sensor
#13
Benyamin Davaji, Hak Dong Cho, Mohamadali Malakoutian, Jong-Kwon Lee, Gennady Panin, Tae Won Kang, Chung Hoon Lee
Micro-fabricated single-layer graphenes (SLGs) on a silicon dioxide (SiO2)/Si substrate, a silicon nitride (SiN) membrane, and a suspended architecture are presented for their use as temperature sensors. These graphene temperature sensors act as resistance temperature detectors, showing a quadratic dependence of resistance on the temperature in a range between 283 K and 303 K. The observed resistance change of the graphene temperature sensors are explained by the temperature dependent electron mobility relationship (~T(-4)) and electron-phonon scattering...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821738/directly-monitor-protein-rearrangement-on-a-nanosecond-to-millisecond-time-scale
#14
Eric H-L Chen, Tony T-Y Lu, Jack C-C Hsu, Yufeng Jane Tseng, T-S Lim, Rita P-Y Chen
In order to directly observe the refolding kinetics from a partially misfolded state to a native state in the bottom of the protein-folding funnel, we used a "caging" strategy to trap the β-sheet structure of ubiquitin in a misfolded conformation. We used molecular dynamics simulation to generate the cage-induced, misfolded structure and compared the structure of the misfolded ubiquitin with native ubiquitin. Using laser flash irradiation, the cage can be cleaved from the misfolded structure within one nanosecond, and we monitored the refolding kinetics of ubiquitin from this misfolded state to the native state by photoacoustic calorimetry and photothermal beam deflection techniques on nanosecond to millisecond timescales...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821713/evaluating-the-causal-relation-of-apoa-iv-with-disease-related-traits-a-bidirectional-two-sample-mendelian-randomization-study
#15
Salome Mack, Stefan Coassin, Julien Vaucher, Florian Kronenberg, Claudia Lamina
Apolipoprotein A-IV (apoA-IV) has been observed to be associated with lipids, kidney function, adiposity- and diabetes-related parameters. To assess the causal relationship of apoA-IV with these phenotypes, we conducted bidirectional Mendelian randomization (MR) analyses using publicly available summary-level datasets from GWAS consortia on apoA-IV concentrations (n = 13,813), kidney function (estimated glomerular filtration rate (eGFR), n = 133,413), lipid traits (HDL cholesterol, LDL cholesterol, triglycerides, n = 188,577), adiposity-related traits (body-mass-index (n = 322,206), waist-hip-ratio (n = 210,088)) and fasting glucose (n = 133,010)...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821658/opposite-synaptic-alterations-at-the-neuromuscular-junction-in-an-als-mouse-model-when-motor-units-matter
#16
Tremblay Elsa, Martineau Éric, Robitaille Richard
Denervation of the neuromuscular junction (NMJ) precedes the loss of motor neurons (MNs) in amyotrophic lateral sclerosis (ALS). ALS is characterized by a motor unit (MU) dependent vulnerability where MNs with fast-fatigable (FF) characteristics are lost first, followed by fast-fatigue resistant (FR) and slow (S) ones. However, changes of NMJ properties as a function of MU types remain debated. We hypothesized that NMJ synaptic functions would be altered precociously in a MU specific manner, prior to structural alterations of the NMJ...
August 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821595/a-computational-model-of-1-5-ag-dynamics-during-pregnancy
#17
Seyedeh M Zekavat, Slava Butkovich, Grace J Young, David M Nathan, Danny Petrasek
The importance of 1,5-anhydroglucitol (1,5-AG) as an intermediate biomarker for diabetic pregnancy is multi-fold: (1) it serves as a reliable indicator of moderate-level glycemic control, especially during early gestation; (2) it has been associated with increased risk of diabetes, independent of HbA1c and fasting glucose; and (3) it is an independent risk factor for the development of eclampsia during pregnancy. However, the clinical use of this biomarker during pregnancy has been underutilized due to physiological changes in glomerular filtration rate, plasma volume, and other hemodynamic parameters which have been hypothesized to bias gestational serum 1,5-AG concentrations...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28821591/specifying-cell-fate-in-roots-requires-coordinative-lineage-instruction-and-positional-reprogramming
#18
Qiaozhi Yu, Pengxue Li, Nengsong Liang, Hong Wang, Meizhi Xu, Shuang Wu
Tissue organization and pattern formation within a multicellular organism relies on coordinated cell division and cell fate determination. In animals cell fates are mainly determined by a cell lineage dependent mechanism, whereas in plants positional information is thought to be the primary determinant of cell fates (Scheres, 2001; Kidner et al., 2000; Kim et al., 2005; Scheres et al., 2002). However, our understanding of cell fate regulation in plants mostly relies on the histological and anatomical studies on Arabidopsis roots which contain a single layer of each cell type in non-vascular tissues (Scheres et al...
August 18, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28821576/effect-of-a-behavioral-intervention-strategy-for-adoption-and-maintenance-of-a-physically-active-lifestyle-the-italian-diabetes-and-exercise-study-ides-2-a-randomized-controlled-trial
#19
Stefano Balducci, Valeria D'Errico, Jonida Haxhi, Massimo Sacchetti, Giorgio Orlando, Patrizia Cardelli, Martina Vitale, Lucilla Bollanti, Francesco Conti, Silvano Zanuso, Antonio Nicolucci, Giuseppe Pugliese
OBJECTIVE: Adherence to physical activity (PA) recommendations is hampered by the lack of effective strategies to promote behavior change. The Italian Diabetes and Exercise Study_2 is a randomized controlled trial evaluating a novel behavioral intervention strategy for increasing PA and decreasing sedentary time (SED-time) in patients with type 2 diabetes. RESEARCH DESIGN AND METHODS: The study randomized 300 physically inactive and sedentary patients with type 2 diabetes 1:1 to receive theoretical and practical counseling once yearly for 3 years (intervention group [INT]) or standard care (control group [CON])...
August 18, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28821572/rolling-neutrophils-form-tethers-and-slings-under-physiologic-conditions-in-vivo
#20
Alex Marki, Konrad Buscher, Zbigniew Mikulski, Axel Pries, Klaus Ley
Human and mouse neutrophils are known to form tethers when rolling on selectins in vitro. Tethers are ∼0.2 μm thin, ∼5-10 μm-long structures behind rolling cells that can swing around to form slings that serve as self-adhesive substrates. Here, we developed a mouse intravital imaging method, where the neutrophil surface is labeled by injecting fluorescently labeled mAb to Ly-6G. Venules in the cremaster muscle of live mice were imaged at a high frame rate using a confocal microscope equipped with a fast resonant scanner...
August 18, 2017: Journal of Leukocyte Biology
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