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https://www.readbyqxmd.com/read/29166555/maximizing-catalysis-of-nanoparticles-via-their-monolayer-assembly-on-nitrogen-doped-graphene
#1
Chao Yu, Xuefeng Guo, Mengqi Shen, Bo Shen, Michelle Muzzio, Zhouyang Yin, Qing Li, Zheng Xi, Junrui Li, Christopher Takakazu Seto, Shouheng Sun
We report a facile interface assembly method to assemble a monolayer array of nitrogen-doped graphene (NG) and nanoparticles (NPs) and then to transfer the dual monolayers onto a solid substrate. Using 3 nm NiPd NPs as an example, we demonstrate that NiPd-NG-Si can function as a catalyst probe and show maximum NiPd catalysis for the hydrolysis of ammonia borane (H3NBH3, AB) with its TOF = 4896.8 h-1 and Ea = 18.8 kJ/mol. The NiPd-NG-Si is also highly active for catalyzing the synthesis of quinazolines in water, only 0...
November 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29166541/photochemcad-3-diverse-modules-for-photophysical-calculations-with-multiple-spectral-databases
#2
Masahiko Taniguchi, Hai Du, Jonathan S Lindsey
The PhotochemCAD program, developed over 30 years, is described comprehensively with focus on features of the most recent version (PhotochemCAD 3). The program is equipped with a streamlined user interface and provisions for handling multiple spectral databases. Eight modules enable calculations to be performed on the basis of the spectra in the databases. The calculational modules provide results concerning properties of individual compounds (oscillator strength, transition dipole moment, natural radiative lifetime), interactions of multiple compounds (Förster energy transfer, Dexter energy transfer, analysis of energy transfer among an array of chromophores), and composition of mixtures (multicomponent analysis)...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29166352/more-learners-finite-resources-and-the-changing-landscape-of-procedural-training-at-the-bedside
#3
Michael A Gisondi, Linda Regan, Jeremy Branzetti, Laura R Hopson
There is growing competition for non-operative, procedural training in teaching hospitals, due to an increased number of individuals seeking to learn procedures from a finite number of appropriate teaching cases. Procedural training is required by students, post-graduate learners, and practicing providers who must maintain their skills. These learner groups are growing in size as the number of medical schools increase and advance practice providers expand their skills to include complex procedures. These various learner needs occur against a background of advancing therapeutic techniques that improve patient care, but also act to reduce the overall numbers of procedures available to learners...
November 21, 2017: Academic Medicine: Journal of the Association of American Medical Colleges
https://www.readbyqxmd.com/read/29165914/solution-processed-wide-bandgap-organic-semiconductor-nanostructures-arrays-for-nonvolatile-organic-field-effect-transistor-memory
#4
Wen Li, Fengning Guo, Haifeng Ling, Hui Liu, Mingdong Yi, Peng Zhang, Wenjun Wang, Linghai Xie, Wei Huang
In this paper, the development of organic field-effect transistor (OFET) memory device based on isolated and ordered nanostructures (NSs) arrays of wide-bandgap (WBG) small-molecule organic semiconductor material [2-(9-(4-(octyloxy)phenyl)-9H-fluoren-2-yl)thiophene]3 (WG3 ) is reported. The WG3 NSs are prepared from phase separation by spin-coating blend solutions of WG3 /trimethylolpropane (TMP), and then introduced as charge storage elements for nonvolatile OFET memory devices. Compared to the OFET memory device with smooth WG3 film, the device based on WG3 NSs arrays exhibits significant improvements in memory performance including larger memory window (≈45 V), faster switching speed (≈1 s), stable retention capability (>10(4) s), and reliable switching properties...
November 22, 2017: Small
https://www.readbyqxmd.com/read/29165900/development-of-a-pre-column-derivatization-hplc-method-with-diode-array-detection-for-the-determination-of-amino-sugars-in-peat-and-soil-humic-acids
#5
Erik Beňo, Róbert Góra, Milan Hutta
The work is focused on the development of a high-performance liquid chromatography method with diode-array detection for the separation and quantitation of the three most abundant amino sugars; d-glucosamine, d-galactosamine, and d-mannosamine. The high-performance liquid chromatography separation was carried out by reversed-phase chromatography on Chromolith Performance RP-18e monolithic column after acid hydrolysis (5 M HCl) and pre-column derivatization of samples using diethyl ethoxymethylenemalonate. Gradient elution and a mobile phase composed of ammonium formate buffer solution (10 mmol L(-1) , pH 3...
November 22, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29165899/quantitative-performance-evaluation-of-a-back-illuminated-scmos-camera-with-95-qe-for-super-resolution-localization-microscopy
#6
Yujie Wang, Lingxi Zhao, Zhe Hu, Yina Wang, Zeyu Zhao, Luchang Li, Zhen-Li Huang
Scientific Complementary Metal Oxide Semiconductor (sCMOS) cameras were introduced into the market in 2009 and are now becoming a major type of commercial cameras for low-light imaging. sCMOS cameras provide simultaneously low read noise, high readout speed, and large pixel array; however, the relatively low quantum efficiency (QE) of sCMOS cameras has been a major limitation for its application in single molecule imaging, especially super-resolution localization microscopy which requires high detection sensitivity...
November 22, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/29165882/single-pixel-black-phosphorus-photodetector-for-near-infrared-imaging
#7
Jinshui Miao, Bo Song, Zhihao Xu, Le Cai, Suoming Zhang, Lixin Dong, Chuan Wang
Infrared imaging systems have wide range of military or civil applications and 2D nanomaterials have recently emerged as potential sensing materials that may outperform conventional ones such as HgCdTe, InGaAs, and InSb. As an example, 2D black phosphorus (BP) thin film has a thickness-dependent direct bandgap with low shot noise and noncryogenic operation for visible to mid-infrared photodetection. In this paper, the use of a single-pixel photodetector made with few-layer BP thin film for near-infrared imaging applications is demonstrated...
November 22, 2017: Small
https://www.readbyqxmd.com/read/29165740/platelets-as-modulators-of-inflammation
#8
Seok-Joo Kim, Rachelle P Davis, Craig N Jenne
Platelets have classically been considered crucial effector cells in hemostasis, but now are increasingly recognized as players during inflammatory responses in innate and adaptive immunity. Platelets can recognize and kill invading pathogens, and, upon stimulation, also release a wide array of mediators that modify immune and endothelial cell responses. Increased platelet activity can protect the host against infectious insults; however, the excessive activity can lead to inflammation-mediated tissue damage...
November 17, 2017: Seminars in Thrombosis and Hemostasis
https://www.readbyqxmd.com/read/29165724/protective-effect-and-potential-mechanism-of-simvastatin-on-myocardial-injury-induced-by-diabetes-with-hypoglycemia
#9
Haiqing Li, Qianqian Zhao, Rong Liu, Lan Yang, Huanzhen Chen, Xiangli Cui
Background Simvastatin has been reported to reduce cardiovascular related morbidity and mortality in clinical trials which was independent of its cholesterol-lowering effect. This study aims to investigate the protective effect of simvastatin on myocardial injury caused by diabetic hypoglycemia and the possible underlying mechanism. Methods We used streptozotocin (STZ) at a dose of 55 mg/kg to induce diabetes mellitus (DM) and over-dose insulin to induce hypoglycemia to establish diabetic hypoglycemia rat models...
November 17, 2017: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/29165646/development-and-application-of-a-recombination-based-library-versus-library-high-throughput-yeast-two-hybrid-rll-y2h-screening-system
#10
Fang Yang, Yingying Lei, Meiling Zhou, Qili Yao, Yichao Han, Xiang Wu, Wanshun Zhong, Chenghang Zhu, Weize Xu, Ran Tao, Xi Chen, Da Lin, Khaista Rahman, Rohit Tyagi, Zeshan Habib, Shaobo Xiao, Dang Wang, Yang Yu, Huanchun Chen, Zhenfang Fu, Gang Cao
Protein-protein interaction (PPI) network maintains proper function of all organisms. Simple high-throughput technologies are desperately needed to delineate the landscape of PPI networks. While recent state-of-the-art yeast two-hybrid (Y2H) systems improved screening efficiency, either individual colony isolation, library preparation arrays, gene barcoding or massive sequencing are still required. Here, we developed a recombination-based 'library vs library' Y2H system (RLL-Y2H), by which multi-library screening can be accomplished in a single pool without any individual treatment...
November 20, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29165638/feasibility-of-real-time-molecular-profiling-for-patients-with-newly-diagnosed-glioblastoma-without-mgmt-promoter-hypermethylation-the-nct-neuro-master-match-n2m2-pilot-study
#11
Elke Pfaff, Tobias Kessler, Gnana Prakash Balasubramanian, Anne Berberich, Daniel Schrimpf, Antje Wick, Jürgen Debus, Andreas Unterberg, Martin Bendszus, Christel Herold-Mende, David Capper, Irini Schenkel, Andreas Eisenmenger, Susan Dettmer, Benedikt Brors, Michael Platten, Stefan M Pfister, Andreas von Deimling, David T W Jones, Wolfgang Wick, Felix Sahm
Introduction: O6-methylguanine-DNA methyltransferase (MGMT) promoter methylation status is a predictive biomarker in glioblastoma patients. Glioblastoma without hypermethylated MGMT promoter are largely resistant to treatment with temozolomide. These patients are in particular need of new treatment approaches, which are offered by biomarker-driven clinical trials with targeted drugs based on molecular characterization of individual tumors. Methods: In preparation for an upcoming clinical study, a comprehensive molecular profiling approach was undertaken on tissues from 43 glioblastoma patients harboring an unmethylated MGMT promoter at diagnosis...
November 18, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/29165617/selective-activation-of-striatal-ngf-trka-p75ntr-mapk-intracellular-signaling-in-rats-that-show-suppression-of-methamphetamine-intake-30-days-following-drug-abstinence
#12
Oscar V Torres, Subramanian Jayanthi, Michael T McCoy, Jean Lud Cadet
Background: The continuing epidemic of methamphetamine (METH) addiction has prompted research aimed at understanding striatal dysfunctions potentially associated with long-term METH use. Methods: Here, we investigated transcriptional and translational alterations in the expression of neurotrophic factors in the rat striatum at 30 days following METH SA and footshock punishment. Male Sprague-Dawley rats were trained to self-administer METH (0.1 mg/kg/injection, i...
November 20, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29165597/gsta1-expression-is-correlated-with-aldosterone-level-in-kcnj5-mutated-adrenal-aldosterone-producing-adenoma
#13
Xintao Li, Baojun Wang, Lu Tang, Yu Zhang, Luyao Chen, Liangyou Gu, Fan Zhang, Jinzhi Ouyang, Xu Zhang
Context: KCNJ5 mutation is a major cause of aldosterone-producing adenoma (APA). The development of APA apart from KCNJ5 mutation is less investigated. Objective: To investigate other mechanisms affecting aldosterone secretion apart from KCNJ5. Patients and Methods: Six pairs of KCNJ5-mutated, high and low aldosterone-secreting APAs, five non-KCNJ5-mutated APAs and four normal adrenal glands were assayed by Affymetrix Genechip Human Transcriptome Array 2...
November 20, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29165562/the-diversity-of-recent-and-ancient-human-dream-a-new-microarray-for-genetic-anthropology-and-genealogy-forensics-and-personalized-medicine
#14
Eran Elhaik, Leeban Yusuf, Ainan I J Anderson, Mehdi Pirooznia, Dimitrios Arnellos, Gregory Vilshansky, Gunes Ercal, Yontao Lu, Teresa Webster, Michael L Baird, Umberto Esposito
The human population displays wide variety in demographic history, ancestry, content of DNA derived from hominins or ancient populations, adaptation, traits, copy number variation (CNVs), drug response, and more. These polymorphisms are of broad interest to population geneticists, forensics investigators, and medical professionals. Historically, much of that knowledge was gained from population survey projects. While many commercial arrays exist for genome-wide single-nucleotide polymorphism (SNP) genotyping, their design specifications are limited and they do not allow a full exploration of biodiversity...
November 20, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29165356/fast-detection-of-a-brca2-large-genomic-duplication-by-next-generation-sequencing-as-a-single-procedure-a-case-report
#15
Marcella Nunziato, Flavio Starnone, Barbara Lombardo, Matilde Pensabene, Caterina Condello, Francesco Verdesca, Chiara Carlomagno, Sabino De Placido, Lucio Pastore, Francesco Salvatore, Valeria D'Argenio
The aim of this study was to verify the reliability of a next generation sequencing (NGS)-based method as a strategy to detect all possible BRCA mutations, including large genomic rearrangements. Genomic DNA was obtained from a peripheral blood sample provided by a patient from Southern Italy with early onset breast cancer and a family history of diverse cancers. BRCA molecular analysis was performed by NGS, and sequence data were analyzed using two software packages. Comparative genomic hybridization (CGH) array was used as confirmatory method...
November 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29165323/negative-differential-mobility-and-trapping-in-active-matter-systems
#16
Charles Reichhardt, Cynthia J Olson Reichhardt
Using simulations, we examine the average velocity as a function of applied drift force for active matter particles moving through a random obstacle array. We find that for low drift force, there is an initial flow regime where the mobility increases linearly with drive, while for higher drift forces a regime of negative differential mobility appears in which the velocity decreases with increasing drive due to the trapping of active particles behind obstacles. A fully clogged regime exists at very high drift forces when all the particles are permanently trapped behind obstacles...
November 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29165244/the-aaa-atpase-vps4-binds-escrt-iii-substrates-through-a-repeating-array-of-dipeptide-binding-pockets
#17
Han Han, Nicole Monroe, Wesley I Sundquist, Peter S Shen, Christopher P Hill
The hexameric AAA ATPase Vps4 drives membrane fission by remodeling and disassembling ESCRT-III filaments. Building upon our earlier 4.3 Å resolution cryo-EM structure (Monroe, Han et al. 2017), we now report a 3.2 Å structure of Vps4 bound to an ESCRT-III peptide substrate. The new structure reveals that the peptide approximates a b-strand conformation whose helical symmetry matches that of the five Vps4 subunits it contacts directly. Adjacent Vps4 subunits make equivalent interactions with successive substrate dipeptides through two distinct classes of side chain binding pockets formed primarily by Vps4 pore loop 1...
November 22, 2017: ELife
https://www.readbyqxmd.com/read/29164878/thermal-hetero-diels-alder-reaction-of-benzocyclobutenones-with-isatins-to-form-2-oxindole-spirolactones
#18
Thomas Wurm, Ben W H Turnbull, Brett R Ambler, Michael J Krische
Benzocyclobutenones 1a-1g undergo cycloreversion at 150 °C in m-xylene solvent to form transient α-oxo-ortho-quinodimethanes or "ortho-quinoid ketene methides", which engage in intermolecular [4+2] cycloadditions with isatins 2a-2f to form 2-oxindole spirolactones 3a-3l. This process tolerates an array of different functional groups and substitution patterns, and is applicable to unprotected isatins 2b-2f bearing free NH-functionalities. The superior performance of isatins compared to other carbonyl based dienophiles was demonstrated and rationalized with the aid of quantum chemical calculations...
November 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29164868/large-scale-lithography-free-production-of-transparent-nanostructured-surface-for-dual-functional-electrochemical-and-sers-sensing
#19
Kuldeep Sanger, Onur Durucan, Kaiyu Wu, Anil Haraksingh Thilsted, Arto R Heiskanen, Tomas Rindzevicius, Michael Stenbæk Schmidt, Kinga Zór, Anja Boisen
In this work, we present a dual-functional sensor that can perform surface-enhanced Raman spectroscopy (SERS) based identification and electrochemical (EC) quantification of analytes in liquid samples. A lithography-free reactive ion etching process was utilized to obtain nanostructures of high aspect ratios distributed homogeneously on a 4-inch fused silica wafer. The sensor was made up of three-electrode array, obtained by subsequent e-beam evaporation of Au on nanostructures in selected areas through a shadow mask...
November 22, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29164275/dna-methylation-markers-associated-with-type-2-diabetes-fasting-glucose-and-hba1c-levels-a-systematic-review-and-replication-in-a-case-control-sample-of-the-lifelines-study
#20
Eliza Walaszczyk, Mirjam Luijten, Annemieke M W Spijkerman, Marc J Bonder, Helen L Lutgers, Harold Snieder, Bruce H R Wolffenbuttel, Jana V van Vliet-Ostaptchouk
AIMS/HYPOTHESIS: Epigenetic mechanisms may play an important role in the aetiology of type 2 diabetes. Recent epigenome-wide association studies (EWASs) identified several DNA methylation markers associated with type 2 diabetes, fasting glucose and HbA1c levels. Here we present a systematic review of these studies and attempt to replicate the CpG sites (CpGs) with the most significant associations from these EWASs in a case-control sample of the Lifelines study. METHODS: We performed a systematic literature search in PubMed and EMBASE for EWASs to test the association between DNA methylation and type 2 diabetes and/or glycaemic traits and reviewed the search results...
November 21, 2017: Diabetologia
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