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https://www.readbyqxmd.com/read/28098460/sulfate-mediated-end-to-end-assembly-of-gold-nanorods
#1
Seyyed Mohammad Hossein Abtahi, Nathan D Burrows, Fred A Idesis, Catherine J Murphy, Navid B Saleh, Peter J Vikesland
There is interest in the controlled aggregation of gold nanorods (GNRs) for the production of extended nanoassemblies. Prior studies have relied upon chemical modification of the GNR surface to achieve a desired final aggregate structure. Herein, we illustrate that control of electrolyte composition can facilitate end-to-end assembly of cetyltrimethylammonium bromide (CTAB) coated GNRs. By adjusting either the sulfate anion concentration or the exposure time it is possible to connect GNRs in chain-like assemblies...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098320/versatile-tissue-lasers-based-on-high-q-fabry-p%C3%A3-rot-microcavities
#2
Yu-Cheng Chen, Qiushu Chen, Tingting Zhang, Wenjie Wang, Xudong Fan
Biolasers are an emerging technology for next generation biochemical detection and clinical applications. Progress has recently been made to achieve lasing from biomolecules and single living cells. Tissues, which consist of cells embedded in an extracellular matrix, mimic more closely the actual complex biological environment in a living body and therefore are of more practical significance. Here, we developed a highly versatile tissue laser platform, in which tissues stained with fluorophores are sandwiched in a high-Q Fabry-Pérot microcavity...
January 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28098299/vacancies-in-functional-materials-for-clean-energy-storage-and-harvesting-the-perfect-imperfection
#3
Guowei Li, Graeme R Blake, Thomas T M Palstra
Vacancies exist throughout nature and determine the physical properties of materials. By manipulating the density and distribution of vacancies, it is possible to influence their physical properties such as band-gap, conductivity, magnetism, etc. This can generate exciting applications in the fields of water treatment, energy storage, and physical devices such as resistance-change memories. In this review, we focus on recent progress in vacancy engineering for the design of materials for energy harvesting applications...
January 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28097598/influence-of-doping-and-nanostructuration-on-n-type-bi2-te0-8se0-2-3-alloys-synthesized-by-arc-melting
#4
Mouna Gharsallah, Federico Serrano-Sanchez, Norbert M Nemes, Jose Luis Martinez, Jose Antonio Alonso
In competitive thermoelectric devices for energy conversion and generation, high-efficiency materials of both n-type and p-type are required. For this, Bi2Te3-based alloys have the best thermoelectric properties in room temperature applications. Partial replacement of tellurium by selenium is expected to introduce new donor states in the band gap, which would alter electrical conductivity and thermopower. We report on the preparation of n-type Bi2(Te1-xSex)3 solid solutions by a straightforward arc-melting technique, yielding nanostructured polycrystalline pellets...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28097170/microsatellite-ssr-amplification-by-pcr-usually-led-to-polymorphic-bands-evidence-which-shows-replication-slippage-occurs-in-extend-or-nascent-dna-strands
#5
Abasalt Hosseinzadeh-Colagar, Mohammad Javad Haghighatnia, Zahra Amiri, Maryam Mohadjerani, Majid Tafrihi
Microsatellites or simple sequence repeats (SSRs) are very effective molecular markers in population genetics, genome mapping, taxonomic study and other large-scale studies. Variation in number of tandem repeats within microsatellite refers to simple sequence length polymorphism (SSLP); but there are a few studies that are showed SSRs replication slippage may be occurred during in vitro amplification which are produced 'stutter products' differing in length from the main products. The purpose of this study is introducing a reliable method to realize SSRs replication slippage...
September 2016: Molecular Biology Research Communications
https://www.readbyqxmd.com/read/28097168/purification-and-biochemical-properties-of-a-thermostable-haloalkaline-cellulase-from-bacillus-licheniformis-amf-07-and-its-application-for-hydrolysis-of-different-cellulosic-substrates-to-bioethanol-production
#6
Fatemeh Azadian, Arastoo Badoei-Dalfard, Abdolhamid Namaki-Shoushtari, Mehdi Hassanshahian
A thermophilic strain AMF-07, hydrolyzing carboxymethylcellulose (CMC) was isolated from Kerman hot spring and was identified as Bacillus licheniformis based on 16S rRNA sequence homology. The carboxymethylcellulase (CMCase) enzyme produced by the B. licheniformis was purified by (NH4)2SO4 precipitation, ion exchange and gel filtration chromatography. The purified enzyme gave a single band on SDS- PAGE with a molecular weight of 37 kDa. The CMCase enzyme was highly active and stable over broad ranges of temperature (40-80ºC), pH (6...
September 2016: Molecular Biology Research Communications
https://www.readbyqxmd.com/read/28095417/schistosoma-mansoni-infection-of-mice-rats-and-humans-elicits-a-strong-antibody-response-to-a-limited-number-of-reduction-sensitive-epitopes-on-five-major-tegumental-membrane-proteins
#7
Greice Krautz-Peterson, Michelle Debatis, Jacqueline M Tremblay, Sergio C Oliveira, Akram A Da'dara, Patrick J Skelly, Charles B Shoemaker
Schistosomiasis is a major disease of the developing world for which no vaccine has been successfully commercialized. While numerous Schistosoma mansoni worm antigens have been identified that elicit antibody responses during natural infections, little is known as to the identities of the schistosome antigens that are most prominently recognized by antibodies generated through natural infection. Non-reducing western blots probed with serum from schistosome-infected mice, rats and humans on total extracts of larval or adult schistosomes revealed that a small number of antigen bands predominate in all cases...
January 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28094312/unraveling-the-microbial-processes-of-black-band-disease-in-corals-through-integrated-genomics
#8
Yui Sato, Edmund Y S Ling, Dmitrij Turaev, Patrick Laffy, Karen D Weynberg, Thomas Rattei, Bette L Willis, David G Bourne
Coral disease outbreaks contribute to the ongoing degradation of reef ecosystems, however, microbial mechanisms underlying the onset and progression of most coral diseases are poorly understood. Black band disease (BBD) manifests as a cyanobacterial-dominated microbial mat that destroys coral tissues as it rapidly spreads over coral colonies. To elucidate BBD pathogenesis, we apply a comparative metagenomic and metatranscriptomic approach to identify taxonomic and functional changes within microbial lesions during in-situ development of BBD from a comparatively benign stage termed cyanobacterial patches...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093899/crucial-role-of-donor-density-in-the-performance-of-oxynitride-perovskite-latio2n-for-photocatalytic-water-oxidation-reaction
#9
Feng-Qiang Xiong, Lipeng Wan, Yue Li, Tiju Thomas, Francis Joseph DiSalvo, Minghui Yang
LaTiO2N photocatalysts were prepared via thermal ammonalysis of flux-synthesized La2Ti2O7 and La2TiO5, and were investigated for water oxidation. Though LaTiO2N derived from La2TiO5 appears defect-free in UV-Vis-NIR and electron paramagnetic resonance spectroscopies, its performance is much lower than conventional La2Ti2O7-derived LaTiO2N with defects. It is shown by Mott-Schottky analysis that La2TiO5-derived LaTiO2N has significantly lower donor density; this can result in insufficient build-in electric field for the separation of photogenerated electrons and holes...
January 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28093592/synthesis-and-optical-and-electrochemical-properties-of-julolidine-structured-pyrido-3-4-b-indole-dye
#10
Toshiaki Enoki, Keishi Matsuo, Joji Ohshita, Yousuke Ooyama
The julolidine-structured pyrido[3,4-b]indole dye ET-1 has been newly designed and developed as a small D-A fluorescent dye. ET-1 showed bathochromic shifts of the fluorescence band upon changing from aprotic solvents to protic solvents, as well as positive fluorescence solvatochromism. Moreover, it was found that ET-1 can form a 1 : 1 Py(N)-B complex with boron trifluoride and a hydrogen-bonded proton transfer (Py(N)-H) complex with trifluoroacetic acid, which exhibit photoabsorption and fluorescence bands at a longer wavelength region than the pristine ET-1...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28092565/a-passive-eeg-bci-for-single-trial-detection-of-changes-in-mental-state
#11
Andrew Myrden, Tom Chau
Traditional brain-computer interfaces often exhibit unstable performance over time. It has recently been proposed that passive brain-computer interfaces may provide a way to complement and stabilize these traditional systems. In this study, we investigated the feasibility of a passive brain-computer interface that uses electroencephalography to monitor changes in mental state on a single-trial basis. We recorded cortical activity from 15 locations while 11 able-bodied adults completed a series of challenging mental tasks...
January 9, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28092511/the-concept-of-effective-inflow-application-to-interictal-localization-of-the-epileptogenic-focus-from-ieeg
#12
Ioannis Vlachos, Balu Krishnan, David Treiman, Konstantinos Tsakalis, Dimitris Kugiumtzis, Leon D Iasemidis
GOAL: Accurate determination of the epileptogenic focus is of paramount diagnostic and therapeutic importance in epilepsy. The current gold standard for focus localization is from ictal (seizure) onset and thus requires the occurrence and recording of multiple typical seizures of a patient. Localization of the focus from seizure-free (interictal) periods remains a challenging problem, especially in the absence of interictal epileptiform activity. METHODS: By exploring the concept of effective inflow, we developed a focus localization algorithm (FLA) based on directed connectivity between brain sites...
November 29, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28092424/continuous-films-of-self-assembled-graphene-quantum-dots-for-n-type-doping-of-graphene-by-uv-triggered-charge-transfer
#13
Myung Jin Park, Yuna Kim, Youngsoo Kim, Byung Hee Hong
The demands to examine components serving as one of the active layers in heterostructures of 2D materials have been recently increasing. Nanomaterials synthesized from a solution process and their self-assembly can provide a promising route to build a new type of mixed dimensional heterostructures, and several methodologies have been reported previously to construct 2D assemblies from colloidal nanostructures in solution. Graphene quantum dots (GQDs), receiving much interest due to the tunable optical band gap and the capability of chemical functionalization, are considered as emerging nanomaterials for various optoelectronic and biological applications...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28089491/satellite-and-central-transitions-selective-1-h-27-al-d-hmqc-experiments-at-very-fast-mas-for-quadrupolar-couplings-determination
#14
Nghia Tuan Duong, Yusuke Nishiyama
Recent study has demonstrated the application of the proton-detected heteronuclear multi-quantum coherence (HMQC) at ultrafast Magic Angle Spinning (MAS) to probe quadrupolar nuclei including (14)N and (35)Cl. In addition, for half-integer quadrupolar nucleus like (35)Cl, the quadrupolar product can be calculated based on the shift difference between the center band of satellite transition (ST) and the central transition (CT) peaks. The applicability of this technique is further investigated on spin I=5/2, namely (27)Al nucleus, and kaolin is chosen as the testing sample...
January 4, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28088854/conjugated-covalent-organic-frameworks-via-michael-addition%C3%A2-elimination
#15
Malakalapalli Rajeswara Rao, Yuan Fang, Steven De Feyter, Dmitrii F Perepichka
Dynamic covalent chemistry enables self-assembly of reactive building blocks into structurally complex yet robust materials, such as Covalent Organic Frameworks (COFs). However, the synthetic toolbox used to prepare such materials, and thus the spectrum of attainable properties, is very limited. For π-conjugated COFs, the Schiff base condensation of aldehydes and amines is the only general dynamic reaction, but the resulting imine-linked COFs display only a moderate electron delocalization and are susceptible to hydrolysis, particularly in acidic conditions...
January 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28087976/the-role-of-diode-array-ultraviolet-detection-for-the-identification-of-synthetic-cathinones
#16
Walter F Rowe, Ioan Marginean, Stephanie Carnes, Ira S Lurie
The utility of diode array UV detection for aiding in the identification of synthetic cathinones, including different sub classes and positional isomers is presented. For 35 synthetic cathinones' unique UV spectra are obtained for seven sub classes including mostly beta ketones, where position and type of substitution on benzene rings give rise to differences in UV maxima and relative intensity of the spectral bands. This aspect is key to distinguishing positional isomers which contain differences in R substitution (mono and di) around the benzene ring, which provides complementary information to electron ionization mass spectrometry, where the latter technique cannot distinguish between these types of positional isomers...
January 14, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28086818/narrow-band-imaging-versus-lugol-chromoendoscopy-to-diagnose-squamous-cell-carcinoma-of-the-esophagus-a-systematic-review-and-meta-analysis
#17
Flavio Hiroshi Ananias Morita, Wanderley Marques Bernardo, Edson Ide, Rodrigo Silva Paula Rocha, Julio Cesar Martins Aquino, Mauricio Kazuyoshi Minata, Kendi Yamazaki, Sergio Barbosa Marques, Paulo Sakai, Eduardo Guimarães Hourneaux de Moura
BACKGROUND: In the early stage esophageal cancer, changes in the mucosa are subtle and pass unnoticed in endoscopic examinations using white light. To increase sensitivity, chromoscopy with Lugol's solution has been used. Technological advancements have led to the emergence of virtual methods of endoscopic chromoscopy, including narrow band imaging (NBI). NBI enhances the relief of the mucosa and the underlying vascular pattern, providing greater convenience without the risks inherent to the use of vital dye...
January 13, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28081257/influence-of-la3-substitution-on-structure-morphology-and-magnetic-properties-of-nanocrystalline-ni-zn-ferrite
#18
Y K Dasan, B H Guan, M H Zahari, L K Chuan
Lanthanum substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5LaxFe1-xO4; 0.00 ≤x≤ 1.00) synthesized by sol-gel method were presented. X-ray diffraction patterns reveal the typical single phase spinel cubic ferrite structure, with the traces of secondary phase for lanthanum substituted nanocrystals. In addition, the structural analysis also demonstrates that the average crystallite size varied in the range of 21-25 nm. FTIR spectra present the two prominent absorption bands in the range of 400 to 600 cm-1 which are the fingerprint region of all ferrites...
2017: PloS One
https://www.readbyqxmd.com/read/28081112/electronic-states-of-defect-with-impurity-and-infrared-emission-on-black-silicon-prepared-by-an-ns-laser
#19
Zhong-Mei Huang, Wei-Qi Huang, Zui-Min Jiang, Shi-Rong Liu, Xue-Ke Wu, Chao-Jian Qin
It is found that the optimum annealing temperature is about 1000°C for the infrared emission of defect states at room temperature on black silicon (BS) prepared by using a nanosecond-pulsed laser. In addition, it is observed that the suitable annealing time is 6∼8  min at 1000°C for the emission on the BS. The crystallizing proceeding in annealing on the BS can be used to explain the above annealing effect. It is interesting that the emission band becomes intensive and broader on the BS prepared in oxygen atmosphere than that prepared in vacuum in the analysis of photoluminescence spectra, where the electronic states localized at the defects from D1 to D4 doped with oxygen play an important role in the emission with the broader band which are obviously enhanced in the room temperature...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28080052/mechanochemical-tuning-of-pyrene-absorption-spectrum-using-force-probes
#20
Miguel Angel Fernández-González, Daniel Rivero, Cristina García-Iriepa, Diego Sampedro, Luis Manuel Frutos
Control of absorption spectra in chromophores is a fundamental aspect of many photochemical and photophysical processes as it constitutes the first step of the global photoinduced process. Here we explore the use of mechanical forces to modulate the light absorption process. Specifically, we develop a computational formalism for determining the type of mechanical forces permitting a global tuning of the absorption spectrum. This control extends to the excitation wavelength, absorption bands overlap and oscillator strength...
January 12, 2017: Journal of Chemical Theory and Computation
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