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https://www.readbyqxmd.com/read/29333694/chemical-composition-fractionation-of-olefin-plastomers-elastomers-by-solvent-and-thermal-gradient-interaction-chromatography
#1
Anthony Ndiripo, Andreas Albrecht, Benjamin Monrabal, Jingbo Wang, Harald Pasch
Olefin plastomers/elastomers are typically copolymers with high comonomer contents and low crystallinities. Therefore, the fractionation of these materials with crystallization-based methods is not feasible. On the other hand, solvent and temperature gradient interaction chromatography (SGIC and TGIC, respectively) are suitable techniques for the separation of olefin copolymers with regard to their chemical composition. In this study, the application ranges of both techniques are investigated and compared for ethylene-propylene (EP) copolymers...
January 15, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29332827/rapid-and-sensitive-detection-of-malachite-green-in-aquaculture-water-by-electrochemical-preconcentration-and-surface-enhanced-raman-scattering
#2
Kai-Xuan Xu, Mei-Hong Guo, Yu-Ping Huang, Xiao-Dong Li, Jian-Jun Sun
A highly sensitive and rapid method of in-situ surface-enhanced Raman spectroscopy (SERS) combining with electrochemical preconcentration (EP) in detecting malachite green (MG) in aquaculture water was established. Ag nanoparticles (AgNPs) were synthesized and spread onto the surface of gold electrodes after centrifuging to produce SERS-active substrates. After optimizing the pH values, preconcentration potentials and times, in-situ EP-SERS detection was carried out. A sensitive and rapid analysis of the low-concentration MG was accomplished within 200s and the limit of detection was 2...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331776/low-cost-screen-printed-electrodes-based-on-electrochemically-reduced-graphene-oxide-carbon-black-nanocomposites-for-dopamine-epinephrine-and-paracetamol-detection
#3
G Ibáñez-Redín, D Wilson, D Gonçalves, O N Oliveira
A green approach for the preparation of carbon black (CB) and electrochemically reduced graphene oxide composite (ERGO) is described based on screen printed carbon electrodes (SPCEs) fabricated on poly(ethylene terephthalate) (PET) as electrochemical sensors. This approach leads to a heterogeneous hydrophilic surface with high concentration of defect sites according to scanning electron microscopy, contact angle and Raman spectroscopy measurements. The SPCE/CB-ERGO sensor was tested with dopamine (DA), epinephrine (EP) and paracetamol (PCM), exhibiting an enhanced electrocatalytic performance compared to the bare SPCE...
December 30, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29331324/rectal-culture-directed-antibiotic-prophylaxis-before-transrectal-prostate-biopsy-reduced-infectious-complications-and-healthcare-costs
#4
J V Baldissera-Aradas, L Rodríguez-Villamil, R Blanco-Fernández, C Pérez-García, G Viejo de la Guerra, I González-Rodríguez, J Mosquera-Madera
BACKGROUND: Transrectal ultrasound-guided prostate biopsy (TUPB) is associated with infectious complications (ICs), which are related to a greater prevalence of ciprofloxacin-resistant bacteria (CRB) in rectal flora. We examined the ICs that occurred in 2 groups: A guided antibiotic prophylaxis (GP) group and an empiric prophylaxis (EP) group. We assessed the financial impact of GP. MATERIAL AND METHODS: The GP group was studied prospectively (June 2013 to July 2014)...
January 10, 2018: Actas Urologicas Españolas
https://www.readbyqxmd.com/read/29331021/onset-progression-and-resolution-of-experimental-peri-implant-mucositis-at-different-abutment-surfaces-a-randomized-controlled-two-center-study
#5
F Schwarz, J Becker, C Sara, D Hazar, T Iglhaut, G Iglhaut
OBJECTIVES: To assess the onset, progression and resolution of experimentally induced peri-implant mucositis lesions at abutments with different microstructures in humans. MATERIAL & METHODS: In a randomized, controlled, interventional two-center study, a total of 28 patients had received 28 target implants and were randomly allocated to either partially microgrooved- (test) or machined (control) healing abutments. The study was accomplished in 3 phases, including a wound healing period (WH) following implant placement (12 weeks), a plaque exposure phase (EP - 21 days) and a resolution phase (RP - 16 weeks)...
January 13, 2018: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/29328244/equivalence-principle-and-quantum-mechanics-quantum-simulation-with-entangled-photons
#6
S Longhi
Einstein's equivalence principle (EP) states the complete physical equivalence of a gravitational field and corresponding inertial field in an accelerated reference frame. However, to what extent the EP remains valid in non-relativistic quantum mechanics is a controversial issue. To avoid violation of the EP, Bargmann's superselection rule forbids a coherent superposition of states with different masses. Here we suggest a quantum simulation of non-relativistic Schrödinger particle dynamics in non-inertial reference frames, which is based on the propagation of polarization-entangled photon pairs in curved and birefringent optical waveguides and Hong-Ou-Mandel quantum interference measurement...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328047/optimal-multichannel-transmission-for-improved-cr-mrept
#7
Gokhan Ariturk, Yusuf Ziya Ider
Magnetic resonance electrical properties tomography (MR-EPT), aiming at reconstructing the EP's at radio frequencies, uses the H<sup>+</sup> field (both magnitude and phase) distribution within the object. One of the MR-EPT algorithms, cr-MREPT, accurately reconstructs the internal tissue boundaries however it faces an artifact which occurs at the regions where the convective field, [ (∂H<sup>+</sup> / ∂x ) - i(∂H<sup>+</sup> / ∂y) i((∂H<sup>+</sup> / ∂x ) - i(∂H<sup>+</sup> / ∂y)) ] , has a low magnitude (at the noise level)...
January 12, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29328024/endometrial-polyps-in-women-of-reproductive-age-clinical-and-pathogene-tic-variations
#8
N Kosei, N Zakharenko, D Herman
The aim of the study was to study the relationship between the morphofunctional characteristics of the endometrium, hormonal homeostasis and microbiocenosis of the reproductive system in patients with endometrial polyps. The study involved 130 patients aged 18-35 years: 34 patients with endometrial polyps, 30 patients with micropolyps, 36 patients with endometrial polyps and micropolyps, 30 healthy women of the control group. Hysteroscopy was performed for women who had been suspected for endometrial polyps and who had infertility or repeated recurrent miscarriages...
December 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29327439/the-hidden-concealed-left-sided-accessory-pathway-an-uncommon-cause-of-svt-in-young-people
#9
Robert H Pass, Leonardo Liberman, Eric S Silver, Christopher M Janson, Andrew D Blaufox, Lynn Nappo, Scott R Ceresnak
BACKGROUND: Concealed left sided accessory pathways (CLAP) are a cause of SVT in the young. Most are mapped with RV apical/outflow pacing. Rarely, alternative means of mapping are required. We review our experience from 3 pediatric EP centers with a rare form of "hidden" CLAP. METHODS: All patients < 21 years undergoing EP study from 2008-2014 with a "hidden" CLAP (defined as an accessory pathway (AP) for which RV pacing at CL's stable for mapping did not demonstrate eccentric retrograde conduction) were included...
January 12, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29325343/-expression-and-significance-of-autophagy-in-rabbit-model-of-tracheal-stenosis
#10
E Y Qin, L M Gan, J H Gan, Y Li, W T Li, C C Hou, X Y Meng, L Zhou, G N Liu
Objective: To investigate the expression and significance of autophagy in rabbit model of tracheal stenosis. Methods: A total of 18 rabbits were equally divided into 3 groups (blank control group, saline group, erythromycin group) in accordance with the random number table. After rabbit model of tracheal stenosis was established, no treatment was done with blank control group. Saline group was atomized with saline (0.54 mg/kg, 2 times/day), and erythromycin group was fed on erythromycin (7.5 mg/kg, 2 times/day) for 7 days before and 10 days after the operation...
December 26, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29325337/-the-application-of-combining-low-dose-naloxone-with-ropivacaine-in-supraclavicular-brachial-plexus-block
#11
J Tang, S Y Zhang, F J Lu, W H Qin, Y S Shi
Objective: To observe the effect of low dose naloxone combinewith ropivacaine for supraclavicular brachial plexus block. Methods: Seventy patients undergoing elective upper limb surgery were randomly divided into two groups, ropivacaine group (Group R, n=35) and naloxone group (Group N, n=35). An ultrasound guided technique was used in both two groups.The onset and duration time of sensory and motor blockade, visual analog score(VAS)of 3, 6, 12, 18, 24 h postoperatively, time of first request fordezocine, total amount of dezocine needed, incidence of nausea and vomiting postoperatively(PONV) and patients' satisfaction score for analgesia in 24 h after surgery were measured...
December 26, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29319807/crystal-structure-of-an-aldehyde-oxidase-from-methylobacillus-sp-ky4400
#12
Hiroyuki Uchida, Bunzou Mikami, Aiko Yamane-Tanabe, Anna Ito, Kouzou Hirano, Masaya Oki
Hetero-trimeric aldehyde oxidases of bacterial origin, which use O2 to catalyse the oxidation of various aldehydes but not those of aromatic N-heterocycles, belong to the xanthine oxidase family. In the present study, the crystal structure of a recombinant aldehyde oxidase from Methylobacillus sp. KY4400 (Mb-AOX) was determined at 2.5 Å resolution. The structures of its subunits resemble those of the corresponding subunits or domains of other structurally characterised enzymes belonging to the family, and include a [4Fe-4S] cluster in the medium subunit like that found in Escherichia coli periplasmic aldehyde oxidoreductase (EP-AOR)...
January 8, 2018: Journal of Biochemistry
https://www.readbyqxmd.com/read/29319324/on-the-complex-and-reversible-pathways-of-cdse-quantum-dots-driven-by-pyroelectric-dep
#13
Giuseppe Nasti, Sara Coppola, Federico Olivieri, Veronica Vespini, Vito Pagliarulo, Pietro Ferraro
Electrophoresis (EP) and dielectrophoresis (DEP) are two well established methodologies to manipulate nanoparticles (NPs). Recently, a DEP by virtual electrodes platform was demonstrated on ferroelectric substrates where the driving force is due to the strong electric field generated by pyroelectric effect thus opening new scenarios for manipulating the matter. Such innovative approach named pyroelectric-DEP has several advantages over the traditional EP and DEP. However, a detailed study on this novel approach is required for understanding the complex pathways traced by nanoparticles (NP) under the action of the pyroelectric driven forces and thus for explaining the final patterns...
January 10, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29317025/electrochemical-sensing-platform-based-on-kelp-derived-hierarchical-meso-macroporous-carbons
#14
Yashuang Hei, Xiqian Li, Xiao Zhou, Jingju Liu, Mimi Sun, Tianze Sha, Cuixing Xu, Wanyi Xue, Xiangjie Bo, Ming Zhou
In this paper, kelp (Laminaria japonica), as a kind of abundant biomass, is used as the precursor for the preparation of kelp-derived hierarchical meso-macroporous carbons (K-dHMMCs) through the carbonization under nitrogen (N2) atmosphere at high temperature. The K-dHMMCs exhibits the unique structure with high specific surface area of 416.02 m2 g-1, large pore volume of 0.24 cm3 g-1, the hierarchical meso-macroporous size distribution centered at 2, 12 and 82 nm and high density of defective sites, enabling K-dHMMCs attractive for the electrocatalysis...
March 20, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29316268/crosstalk-between-hepatitis-b-virus-x-and-high-mobility-group-box-1-facilitates-autophagy-in-hepatocytes
#15
Sha Fu, Juan Wang, Xingwang Hu, Rong-Rong Zhou, Yongming Fu, Daolin Tang, Rui Kang, Yan Huang, Lunquan Sun, Ning Li, Xue-Gong Fan
Hepatitis B virus (HBV) X (HBx) protein is a pivotal regulator of HBV-triggered autophagy. However, the role of HBx-induced epigenetic changes in autophagy remains largely unknown. The cytoplasmic high-mobility group box 1 (HMGB1) has been identified as a positive regulator of autophagy, and its cytoplasmic translocation is closely associated with its acetylation status. Here, we evaluated the function of HMGB1 in HBx-mediated autophagy and its association with histone deacetylase (HDAC). Using cell lines with enforced expression of HBx, we demonstrated that HBx upregulated the expression of HMGB1 and promoted its cytoplasmic translocation by acetylation to facilitate autophagy...
January 5, 2018: Molecular Oncology
https://www.readbyqxmd.com/read/29316261/arrhythmia-after-cone-repair-for-ebstein-anomaly-the-mayo-clinic-experience-in-143-young-patients
#16
Philip Wackel, Bryan Cannon, Joseph Dearani, Kristen Sessions, Kimberly Holst, Jonathan Johnson, Frank Cetta
BACKGROUND: The increased incidence of preoperative and postoperative arrhythmia in Ebstein anomaly (EA) prompted some clinicians to perform an electrophysiology study (EPS) in all patients prior to surgery for EA. The cone repair (CR) is the current surgical option of choice for most young patients with EA but the effect of the CR on arrhythmia is not well established. OBJECTIVES: To assess the burden of arrhythmia in young patients after CR and to assess the utility of selective preoperative EPS...
January 8, 2018: Congenital Heart Disease
https://www.readbyqxmd.com/read/29314654/exercise-program-for-children-and-adolescents-with-leukemia-and-lymphoma-during-treatment-a-comprehensive-review
#17
REVIEW
Giulia Zucchetti, Francesca Rossi, Carolina Chamorro Vina, Nicoletta Bertorello, Franca Fagioli
An exercise program (EP) during cancer treatment seems to be a valid strategy against physiological and quality-of-life impairments, but scientific evidence of benefits among pediatric patients is still limited. This review summarizes the literature focused on randomized controlled trials of EP offered to patients during leukemia and lymphoma treatment. Studies published up to June 2017 were selected from multiple databases and assessed by three independent reviewers for methodological validity. The review identified eight studies, but several types of bias have to be avoided to provide evidence-based recommendations accessible to patients, families, and professionals...
January 4, 2018: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/29298481/modeling-the-transient-kinetics-of-the-l1-metallo-%C3%AE-lactamase
#18
Maria G Khrenova, Alexander V Nemukhin
The transient absorption spectroscopy of hydrolysis of the chromogenic substrate nitrocefin by the L1 metallo-β-lactamase (MβL), a bacterial enzyme responsible for destruction of β-lactam antibiotics molecules, showed formation and decay of a plausible red-shifted reaction intermediate. We propose a mechanism of this important reaction consistent with the transient kinetic data. Quantum mechanics/molecular mechanics (QM/MM) simulations of the reaction pathway revealed occurrence of two reaction intermediates (I1, I2) between the enzyme-substrate (ES) and enzyme-product (EP) complexes...
January 3, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29297240/re-global-health-resource-utilization-associated-with-pacemaker-complications
#19
Claire Ep Brough, Alan Haycox
No abstract text is available yet for this article.
January 3, 2018: Journal of Medical Economics
https://www.readbyqxmd.com/read/29291563/environmental-impacts-and-resource-use-of-milk-production-on-the-north-china-plain-based-on-life-cycle-assessment
#20
Xiaoqin Wang, Stewart Ledgard, Jiafa Luo, Yongqin Guo, Zhanqin Zhao, Liang Guo, Song Liu, Nannan Zhang, Xueqin Duan, Lin Ma
Life cycle assessment methodology was used to quantify the environmental impacts and resource use of milk production on the North China Plain, the largest milk production area in China. Variation in environmental burden caused by cow productivity was evaluated, as well as scenario analysis of the effects of improvement practices. The results indicated that the average environmental impact potential and resource use for producing 1kg of fat and protein corrected milk was 1.34kgCO2eq., 9.27gPO43-eq., 19.5gSO2eq...
December 29, 2017: Science of the Total Environment
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