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https://www.readbyqxmd.com/read/28325036/microwave-hydrothermal-synthesis-of-terbium-ions-complexed-with-porous-graphene-for-effective-absorbent-for-organic-dye
#1
Keqin Chen, Hui Gao, Bowei Bai, Wenjing Liu, Xiaolong Li
A luminescent terbium ions/reduced graphene oxide complex (Tb-RGO) was successfully and rapidly synthesized by the microwave hydrothermal reaction via the interactions between terbium ions and the active oxygen functional groups of graphene oxide. The as-prepared material was porous stacked by multilayer graphene in all directions. Thus, the resulting product owed the high specific surface area, high adsorption capacity and ultra-fast adsorption rate. Combined with the characteristic photoluminescence derived from terbium ions, the material has potential applications in biosensing and environmental protection...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28325008/feasibility-of-an-ultra-low-power-digital-signal-processor-platform-as-a-basis-for-a-fully-implantable-brain-computer-interface-system
#2
Po T Wang, Keulanna Gandasetiawan, Colin M McCrimmon, Alireza Karimi-Bidhendi, Charles Y Liu, Payam Heydari, Zoran Nenadic, An H Do
A fully implantable brain-computer interface (BCI) can be a practical tool to restore independence to those affected by spinal cord injury. We envision that such a BCI system will invasively acquire brain signals (e.g. electrocorticogram) and translate them into control commands for external prostheses. The feasibility of such a system was tested by implementing its benchtop analogue, centered around a commercial, ultra-low power (ULP) digital signal processor (DSP, TMS320C5517, Texas Instruments). A suite of signal processing and BCI algorithms, including (de)multiplexing, Fast Fourier Transform, power spectral density, principal component analysis, linear discriminant analysis, Bayes rule, and finite state machine was implemented and tested in the DSP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324802/pelvic-exenteration-case-series-a-single-surgeon-s-experience-at-one-institution-in-trinidad-and-tobago
#3
Ravi Maharaj, Vandana Devika Sookdeo, Maurice Fortuné, Meenakshi Akhilesh, Chalapathi Rao Adidam Venkata, Wayne Mohammed, Dave Harnanan, Wayne A Warner
INTRODUCTION: Pelvic exenteration (PE) is an ultra-radical surgical procedure characterized by the en bloc resection of the pelvic organs. METHODS: In this case series, we report retrospectively on four patients who underwent PE in Trinidad and Tobago from 2012 to 2016. One male patient had rectal cancer while one each of three women had cervical, colon, or rectal cancer. RESULTS: Early postoperative complications (≤30days) occurred in all patients, while late complications (>30days) occurred in one patient (Grade 1 - Clavien-Dindo classification)...
March 7, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28323657/histology-and-gadolinium-distribution-in-the-rodent-brain-after-the-administration-of-cumulative-high-doses-of-linear-and-macrocyclic-gadolinium-based-contrast-agents
#4
Jessica Lohrke, Anna-Lena Frisk, Thomas Frenzel, Laura Schöckel, Martin Rosenbruch, Gregor Jost, Diana Constanze Lenhard, Martin A Sieber, Volker Nischwitz, Astrid Küppers, Hubertus Pietsch
OBJECTIVES: Retrospective studies in patients with primary brain tumors or other central nervous system pathologies as well as postmortem studies have suggested that gadolinium (Gd) deposition occurs in the dentate nucleus (DN) and globus pallidus (GP) after multiple administrations of primarily linear Gd-based contrast agents (GBCAs). However, this deposition has not been associated with any adverse effects or histopathological alterations. The aim of this preclinical study was to systematically examine differences between linear and macrocyclic GBCAs in their potential to induce changes in brain and skin histology including Gd distribution in high spatial resolution...
March 20, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28323632/exposure-of-pt-5%C3%A2-5%C3%A2-3-and-rh-1%C3%A2-1%C3%A2-1-to-atomic-and-molecular-oxygen-do-defects-enhance-subsurface-oxygen-formation
#5
Rachael G Farber, Marie E Turano, Eleanor C N Oskorep, Noelle T Wands, Ludo B F Juurlink, Daniel R Killelea
Subsurface oxygen is known to form in transition metals, and is thought to be an important aspect of their ability to catalyze chemical reactions. The formation of subsurface oxygen is not, however, equivalent across all catalytically relevant metals. As a result, it is difficult to predict the stability and ease of the formation of subsurface oxygen in metals, as well as how the absorbed oxygen affects the chemical and physical properties of the metal. In comparing how a stepped platinum surface, Pt(5 5 3), responds to exposure to gas-phase oxygen atoms under ultra-high vacuum conditions to planar Rh(1 1 1), we are able to determine what role, if any, steps have on the capacity of a metal for subsurface oxygen formation...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323408/monodispersed-carbon-coated-cubic-nip2-nanoparticles-anchored-on-carbon-nanotubes-as-ultra-long-life-anodes-for-reversible-lithium-storage
#6
Peili Lou, Zhonghui Cui, Zhiqing Jia, Jiyang Sun, Yingbin Tan, Xiangxin Guo
In search of new electrode materials for lithium-ion batteries (LIB), metal phosphides that exhibit desirable properties such as high theoretical capacity, moderate discharge plateau and relative low polarization recently attract a great deal of attention as anode materials. However, the large volume changes and thus resulted collapse of electrode structure during long-term cycling are still the challenges for metal phosphide-based anodes. Here we report an electrode design strategy to solve these problems...
March 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28319902/ultra-high-sensitivity-of-the-non-immunological-affinity-of-graphene-oxide-peptide-based-surface-plasmon-resonance-biosensors-to-detect-human-chorionic-gonadotropin
#7
Nan-Fu Chiu, Chia-Tzu Kuo, Ting-Li Lin, Chia-Chen Chang, Chen-Yu Chen
Specific peptide aptamers can be used in place of expensive antibody proteins, and they are gaining increasing importance as sensing probes due to their potential in the development of non-immunological assays with high sensitivity, affinity and specificity for human chorionic gonadotropin (hCG) protein. We combined graphene oxide (GO) sheets with a specific peptide aptamer to create a novel, simple and label-free tool to detect abnormalities at an early stage of pregnancy, a GO-peptide-based surface plasmon resonance (SPR) biosensor...
March 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28319395/spreading-kinetics-of-ultra-thin-liquid-films-using-molecular-dynamics
#8
Brooklyn Ann Noble, C Mathew Mate, Bart Raeymaekers
Ultra-thin liquid films play a critical role in numerous engineering applications. Although crucial to the design and application of ultra-thin liquid films, the physical mechanisms that govern spreading on the molecular scale are not well-understood, and disagreement among experiments, simulations, and theory remains. We use molecular dynamics simulations to quantify the speed at which the edge of a polymer droplet advances on a flat substrate as a function of various environmental and design parameters. We explain the physical mechanisms that drive and inhibit spreading, identify different spreading regimes, and clarify transitions between spreading regimes...
March 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28319152/a-digital-pcr-method-for-identifying-and-quantifying-adulteration-of-meat-species-in-raw-and-processed-food
#9
Junan Ren, Tingting Deng, Wensheng Huang, Ying Chen, Yiqiang Ge
Meat adulteration is a worldwide concern. In this paper, a new droplet digital PCR (ddPCR) method was developed for the quantitative determination of the presence of chicken in sheep and goat meat products. Meanwhile, a constant (multiplication factor) was introduced to transform the ratio of copy numbers to the proportion of meats. The presented ddPCR method was also proved to be more accurate (showing bias of less than 9% in the range from 5% to 80%) than real-time PCR, which has been widely used in this determination...
2017: PloS One
https://www.readbyqxmd.com/read/28318927/classical-versus-custom-orbital-wall-reconstruction-selected-factors-regarding-surgery-and-hospitalization
#10
Rafał Zieliński, Marta Malińska, Marcin Kozakiewicz
PURPOSE: Nowadays, in orbital wall reconstruction, maxillofacial surgeons have the possibility to treat patients in modern ways such as with individual implants. Nevertheless, conventional treatment including standard titanium mesh shaped during the surgical procedure is also widely used. The aim of this study was to compare the above methods of orbital wall reconstructions. MATERIALS AND METHODS: In the first group (39 cases), patients were treated by means of computer-aided design/computer-aided manufacturing (CAD/CAM) milled individual implants made of ultra-high-molecular-weight polyethylene, dioxide zirconium and rapid prototyping titanium mesh pre-bent on an ABS model made by a three-dimensional (3D) printer...
February 17, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28318840/self-reported-sleep-disturbances-associated-with-procedural-learning-impairment-in-adolescents-at-ultra-high-risk-for-psychosis
#11
Jessica R Lunsford-Avery, Derek J Dean, Vijay A Mittal
Sleep disturbance contributes to impaired procedural learning in schizophrenia, yet little is known about this relationship prior to psychosis onset. Adolescents at ultra high-risk (UHR; N=62) for psychosis completed the Pittsburgh Sleep Quality Index (PSQI) and a procedural learning task (Pursuit Rotor). Increased self-reported problems with sleep latency, efficiency, and quality were associated with impaired procedural learning rate. Further, within-sample comparisons revealed that UHR youth reporting better sleep displayed a steeper learning curve than those with poorer sleep...
March 16, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28318747/ultra-fast-quantitation-of-voriconazole-in-human-plasma-by-coated-blade-spray-mass-spectrometry
#12
Marcos Tascon, Germán Augusto Gómez-Ríos, Nathaly Reyes-Garcés, Justen Poole, Ezel Boyacı, Janusz Pawliszyn
Voriconazole is a triazole broad-spectrum antifungal medication often used to treat fungal infections caused by Aspergillus and Fusarium species. One of the main challenges associated with the implementation of this medication is its narrow therapeutic concentration range, demonstrating toxicity at concentrations above 6μg/mL and limited efficacy at concentrations below 2μg/mL. As a result, methodologies which permit the rapid and accurate quantitation of voriconazole in patients are highly desirable. In this work two different approaches based on coated blade spray directly coupled to mass spectrometry (CBS-MS) are introduced; each enabling the quantitation of voriconazole in plasma samples with a simple and fast sample preparation and no chromatographic step...
March 12, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28318234/light-absorbing-brown-carbon-aerosol-constituents-from-combustion-of-indonesian-peat-and-biomass
#13
Sri Hapsari Budisulistiorini, Matthieu Riva, Michael Williams, Jing Chen, Masayuki Itoh, Jason Douglas Surratt, Mikinori Kuwata
Light-absorbing brown carbon (BrC) constituents of organic aerosol (OA) have been shown to significantly absorb ultra-violet (UV) and visible light, and thus, impact radiative forcing. However, molecular identification of the BrC constituents is still limited. In this study, we characterize BrC constituents at the molecular level in: i) aerosols emitted by combustion of peat, fern/leaf, and charcoal from Indonesia and ii) ambient aerosols collected in Singapore during the 2015 haze episode. Aerosols were analyzed using ultra-performance liquid chromatography interfaced to a diode array detector and electrospray ionization high-resolution quadrupole time-of-flight mass spectrometer (UPLC/DAD-(-)ESI-HR-QTOFMS) operated in the negative ion mode...
March 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28318065/ultra-narrow-low-bandgap-graphene-nanoribbons-from-bromoperylenes-synthesis-and-terahertz-spectroscopy
#14
Daniel Jänsch, Ivan Ivanov, Yulian Zagranyarski, Ivana Duznovic, Martin Baumgarten, Dimitry Turchinovich, Chen Li, Mischa Bonn, Klaus Müllen
Soluble ultra-narrow armchair graphene nanoribbons (AGNRs) with length of ≈20 nm and completely fused cores exceeding 5 nm in length, pronounced near-infrared (NIR) absorption up to 1400 nm, and a low band gap (≈0.9 eV) are synthesized from 3,9(3,10)-dibromoperylene and 3,4,9,10-tetrabromoperylene. Since the monomers are obtained from perylene carboxyanhydrides, a remarkable link between dye and graphene chemistry is established. The two-step protocol for the AGNR synthesis by aryl-aryl coupling and subsequent cyclodehydrogenation is compared with a direct Yamamoto polymerization...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28317892/ultra-wide-range-field-dependent-measurements-of-the-relaxivity-of-gd1-xeuxvo4-nanoparticle-contrast-agents-using-a-mechanical-sample-shuttling-relaxometer
#15
Ching-Yu Chou, Mouna Abdesselem, Cedric Bouzigues, Minglee Chu, Angelo Guiga, Tai-Huang Huang, Fabien Ferrage, Thierry Gacoin, Antigoni Alexandrou, Dimitris Sakellariou
The current trend for Magnetic Resonance Imaging points towards higher magnetic fields. Even though sensitivity and resolution are increased in stronger fields, T1 contrast is often reduced, and this represents a challenge for contrast agent design. Field-dependent measurements of relaxivity are thus important to characterize contrast agents. At present, the field-dependent curves of relaxivity are usually carried out in the field range of 0 T to 2 T, using fast field cycling relaxometers. Here, we employ a high-speed sample shuttling device to switch the magnetic fields experienced by the nuclei between virtually zero field, and the center of any commercial spectrometer...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317891/hepatic-mitochondrial-dysfunction-is-a-feature-of-glycogen-storage-disease-type-ia-gsdia
#16
Benjamin L Farah, Rohit A Sinha, Yajun Wu, Brijesh K Singh, Andrea Lim, Masahiro Hirayama, Dustin J Landau, Boon Huat Bay, Dwight D Koeberl, Paul M Yen
Glycogen storage disease type Ia (GSDIa, von Gierke disease) is the most common glycogen storage disorder. It is caused by the deficiency of glucose-6-phosphatase, an enzyme which catalyses the final step of gluconeogenesis and glycogenolysis. Clinically, GSDIa is characterized by fasting hypoglycaemia and hepatic glycogen and triglyceride overaccumulation. The latter leads to steatohepatitis, cirrhosis, and the formation of hepatic adenomas and carcinomas. Currently, little is known about the function of various organelles and their impact on metabolism in GSDIa...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317887/nmr-spectroscopy-of-single-sub-nl-ova-with-inductive-ultra-compact-single-chip-probes
#17
Marco Grisi, Franck Vincent, Beatrice Volpe, Roberto Guidetti, Nicola Harris, Armin Beck, Giovanni Boero
Nuclear magnetic resonance (NMR) spectroscopy enables non-invasive chemical studies of intact living matter. However, the use of NMR at the volume scale typical of microorganisms is hindered by sensitivity limitations, and experiments on single intact organisms have so far been limited to entities having volumes larger than 5 nL. Here we show NMR spectroscopy experiments conducted on single intact ova of 0.1 and 0.5 nL (i.e. 10 to 50 times smaller than previously achieved), thereby reaching the relevant volume scale where life development begins for a broad variety of organisms, humans included...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317410/sex-hormone-binding-globulin-and-antithrombin-iii-activity-in-women-with-oral-ultra-low-dose-estradiol
#18
Sumika Matsui, Toshiyuki Yasui, Kana Kasai, Kaoru Keyama, Kanako Yoshida, Takeshi Kato, Hirokazu Uemura, Akira Kuwahara, Toshiya Matsuzaki, Minoru Irahara
Oral oestrogen increases the risk of venous thromboembolism (VTE) and increases production of sex hormone-binding globulin (SHBG) in a dose-dependent manner. SHBG has been suggested to be involved in venous thromboembolism. We examined the effects of oral ultra-low-dose oestradiol on circulating levels of SHBG and coagulation parameters, and we compared the effects to those of transdermal oestradiol. Twenty women received oral oestradiol (500 μg) every day (oral ultra-low-dose group) and 20 women received a transdermal patch (50 μg) as a transdermal group...
March 20, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28317265/simultaneous-determination-of-eight-alkaloids-and-oleandrin-in-herbal-cosmetics-by-dispersive-solid-phase-extraction-coupled-with-ultra-high-performance-liquid-chromatography-and-tandem-mass-spectrometry
#19
Zhiqing Xun, Donghong Liu, Rongrong Huang, Shuang He, Du Hu, Xindong Guo, Yanping Xian
We utilized ultra high performance liquid chromatography with tandem mass spectrometry and dispersive solid-phase extraction to develop a new method for the detection of nine analytes (scopolamine, cephaeline, strychnine, hyoscyamine, brucine, hydrastine, ajmalicine, colchicine and oleandrin) in herbal cosmetics. Acetonitrile/water and 2-propylaminoethylamine were used to disperse and purify during the dispersive solid-phase extraction step. The analytes were separated by a Waters UPLC HSS T3 column and detected through electrospray ionization source in the positive mode with multi-reaction monitoring conditions...
March 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28317248/influence-of-different-processing-times-on-the-quality-of-polygoni-multiflora-radix-by-metabolomics-based-on-ultra-high-performance-liquid-chromatography-with-quadrupole-time-of-flight-mass-spectrometry
#20
Xie-An Yu, Ai-Hua Ge, Lu Zhang, Jin Li, Mingrui An, Jun Cao, Jun He, Xiu-Mei Gao, Yan-Xu Chang
A metabolomics method based on ultra high performance liquid chromatography with quadrupole time-of-flight mass spectrometry was developed to evaluate the influence of processing times on the quality of raw and processed Polygoni Multiflora Radix. Principal component analysis and partial least squares discriminant analysis was used to screen the potential maker metabolites that were contributed to the quality changes. Then these marker metabolites were selected as variables in Fisher's discriminant analysis to establish the models that were used to distinguish the raw and processed Polygoni Multiflora Radix in the markets...
March 20, 2017: Journal of Separation Science
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