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https://www.readbyqxmd.com/read/28544921/in-situ-formed-copper-nanoparticles-templated-by-tdt-mediated-dna-for-enhanced-spr-sensor-based-dna-assay
#1
Pei-Xin Yuan, Sheng-Yuan Deng, Chen-Yu Zheng, Serge Cosnier, Dan Shan
For the efficient surface plasmon resonance (SPR)-based DNA assay researching, signal amplification tactics were absolutely necessary. In this work, a sensitive SPR-DNA sensor was developed by employing in situ synthesis of copper nanoparticles (CuNPs) templated by poly-T sequences DNA from terminal deoxynucleotidyl transferase (TdT)-mediated extension, and synergistically with nano-effect deposition as the mass relay. The objective of this strategy was manifold: firstly, tDNA hybridized with the optimal designed probes to active the TdT-mediated DNA extension onto the surface of SPR chip, resulted a long poly-T sequences ssDNA chain in dsDNA terminal onto surface of gold chip and characterized by SPR signal amplitudes...
May 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28544074/single-stage-aesthetic-and-functional-reconstruction-of-composite-facial-gunshot-wound-with-a-chimeric-functioning-muscle-and-fibular-osseous-flap-case-report-and-review-of-the-literature
#2
Andreas Gravvanis, Konstantinos Apostolou, Dimitrios Anterriotis, Dimosthenis Tsoutsos
The current concepts in the aesthetic and functional reconstruction of complex oromandibular defects are presented with a case of a patient with self-inflicted gunshot wound to the face. The patient presented with a 6 cm composite mandibular defect; the buccomandibular and suborbital aesthetic zones of the cheek along with the mucosa lining, and the ipsilateral facial musculature were missing. A rapid prototyping model of the facial skeleton was used to assist in preoperative planning. A single stage reconstruction with two free flaps was planned; a free fibula osseous flap to reconstruct the mandibular defect, and a free chimeric ALT/functioning vastus lateralis muscle...
May 23, 2017: Microsurgery
https://www.readbyqxmd.com/read/28543873/effect-of-surgery-vs-observation-skeletal-5-year-outcomes-in-a-randomized-trial-of-patients-with-primary-hpt-the-siph-study
#3
Karolina Lundstam, Ansgar Heck, Kristin Godang, Charlotte Mollerup, Marek Baranowski, Ylva Pernow, Turid Aas, Ola Hessman, Thord Rosén, Jörgen Nordenström, Svante Jansson, Mikael Hellström, Jens Bollerslev
Mild primary hyperparathyroidism (PHPT) is known to affect the skeleton, even though patients usually are asymptomatic. Treatment strategies have been widely discussed. However, long-term randomized studies comparing parathyroidectomy to observation are lacking. The objective was to study the effect of parathyroidectomy (PTX) compared to observation (OBS) on bone mineral density (BMD) in g/cm(2) and T-scores, and on biochemical markers of bone turnover (P1NP and CTX-1), in a prospective randomized controlled study of patients with mild PHPT after 5 years of follow-up...
May 25, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28543831/selective-bromination-of-graphene-oxide-by-hunsdiecker-reaction
#4
Ondrej Jankovsky, Michal Lojka, Jan Luxa, David Sedmidubsky, Ondrej Tomanec, Radek Zboril, Martin Pumera, Zdenek Sofer
Halogenated graphenes have been attracting great attention in the recent years. The currently used methods are usually non-specific and halogen groups are randomly distributed over the graphene surface. The selective functionalization based on well known reaction mechanism allowed selective functionalization of graphene sheets. We show the application of Hunsdicker based reaction on the graphene oxide for selective bromination of graphene oxide. The chemical analysis using various spectroscopic methods proved a highly effective functionalization...
May 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543631/a-three-dimensional-placoderm-stem-group-gnathostome-pharyngeal-skeleton-and-its-implications-for-primitive-gnathostome-pharyngeal-architecture
#5
Martin D Brazeau, Matt Friedman, Anna Jerve, Robert C Atwood
The pharyngeal skeleton is a key vertebrate anatomical system in debates on the origin of jaws and gnathostome (jawed vertebrate) feeding. Furthermore, it offers considerable potential as a source of phylogenetic data. Well-preserved examples of pharyngeal skeletons from stem-group gnathostomes remain poorly known. Here, we describe an articulated, nearly complete pharyngeal skeleton in an Early Devonian placoderm fish, Paraplesiobatis heinrichsi Broili, from Hunsrück Slate of Germany. Using synchrotron light tomography, we resolve and reconstruct the three-dimensional gill arch architecture of Paraplesiobatis and compare it with other gnathostomes...
May 23, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28541694/metal-organic-frameworks-for-heterogeneous-basic-catalysis
#6
Li Zhu, Xiao-Qin Liu, Hai-Long Jiang, Lin-Bing Sun
Great attention has been given to metal-organic frameworks (MOFs)-derived solid bases because of their attractive structure and catalytic performance in various organic reactions. The extraordinary skeleton structure of MOFs provides many possibilities for incorporation of diverse basic functionalities, which is unachievable for conventional solid bases. The past decade has witnessed remarkable advances in this vibrant research area; however, MOFs for heterogeneous basic catalysis have never been reviewed until now...
May 25, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28541687/bicyclic-alkyl-amino-carbenes-bicaacs-stable-carbenes-more-ambiphilic-than-caacs
#7
Eder Tomás-Mendivil, Max M Hansmann, Cory M Weinstein, Rodolphe Jazzar, Mohand Melaimi, Guy Bertrand
A straightforward strategy allows for the synthesis of storable bicyclic (alkyl)(amino)carbenes (BICAACs), which feature enhanced σ-donating and π-accepting properties compared to monocyclic (alkyl)(amino)carbenes (CAACs). Due to the bicyclo[2.2.2]octane skeleton, the steric environment around the carbene center is different from that of CAACs, and similar to that observed in classical NHCs. The different electronic properties of BICAACs as compared to CAACs allow for ligand exchange reactions not only at a metal center, but also at main group elements...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541651/channel-crack-designed-gold-pu-sponge-for-highly-elastic-piezoresistive-sensor-with-excellent-detectability
#8
Yun-Hui Wu, Hai-Zhou Liu, Song Chen, Xuchu Dong, Ping-Ping Wang, Shuqi Liu, Yong Lin, Yong Wei, Lan Liu
It is a great challenge to fabricate piezoresistive sensors that possess high elasticity, large-area compliance and excellent detectability to satisfy both extremely tiny and large human activities monitoring. Herein, a novel and facile strategy is reported to manufacture highly elastic channel crack-based gold@PU sponge piezoresistive material. The elastic 3D conductive network is successfully prepared by gold ion sputtering, and channel cracks are skillfully designed on the 3D sponge skeletons. Such novel structure makes these fabricated sensors are capable of monitoring both tiny and large human motions, which originate from the nano-crack joint sensing mechanism and physical contact of conductive interconnected network...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28541369/neobraclactones-a-c-three-unprecedented-chaise-longue-shaped-xanthones-from-garcinia-bracteata
#9
Sheng-Li Niu, Da-Hong Li, Yue-Tong Wang, Kai-Bo Wang, Bin Lin, Yong-Kui Jing, Hui-Ming Hua, Jiao Bai, Zhan-Lin Li
Neobraclactones A-C (1-3), featuring an unprecedented further rearranged prenylxanthone skeleton with a unique octahydro-2H-1,3-dioxacyclopenta[c,d]inden-2-one scaffold, along with their biosynthesis-related known compound neobractatin (4), were isolated from the leaves of Garcinia bracteata. Their structures with absolute configurations were determined by extensive analyses of spectroscopic data and ECD calculations. Compounds 1 and 2 showed significant growth inhibition activities against the human leukaemia HL-60 and K562 cell lines with GI50 values from 0...
May 25, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28541051/catalytic-asymmetric-construction-of-the-tryptanthrin-skeleton-via-an-enantioselective-decarboxylative-4-2-cyclization
#10
Guang-Jian Mei, Chen-Yu Bian, Guo-Hao Li, Shao-Li Xu, Wen-Qin Zheng, Feng Shi
The first catalytic asymmetric construction of the tryptanthrin skeleton has been established, taking advantage of a palladium(0)/chiral ligand-catalyzed enantioselective decarboxylative [4 + 2] cyclization of vinyl benzoxazinanones with isatins. This reaction has not only provided a direct and efficient method for constructing chiral tryptanthrin skeleta in high yields and excellent enantioselectivities (up to 97% yield, >99% ee) but also represents the first catalytic asymmetric decarboxylative cyclization of vinyl benzoxazinanones with isatins...
May 25, 2017: Organic Letters
https://www.readbyqxmd.com/read/28540729/dye-bio-mof-1-composite-as-a-dual-emitting-platform-for-enhanced-detection-of-a-wide-range-of-explosive-molecules
#11
Chen Wang, Li Tian, Wei Zhu, Shiqiang Wang, Peng Wang, Yun Liang, Wanlin Zhang, Hongwei Zhao, Guangtao Li
By incorporating a cationic dye within metal-organic framework (MOF) through ion-exchange process, a responsive dye@bio-MOF-1 composite has been synthesized, serving as a dual-emitting platform for enhanced detection of different kinds of nitro-explosives, especially the nitroalkanes, nitramines and nitrate esters. The dye@bio-MOF-1 composite was constructed with free amines on their well-defined cavities, which is essential for the capture of explosives into their confined nanospace. It was observed that the encapsulation of explosives into the constructed dye@bio-MOF-1 composite could dramatically alter the luminescent properties of the dyes as well as the MOF skeletons owing to the size exclusivity and confinement-induced effect...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540401/white-matter-microstructure-damage-in-tremor-dominant-parkinson-s-disease-patients
#12
ChunYan Luo, Wei Song, Qin Chen, Jing Yang, QiYong Gong, Hui-Fang Shang
PURPOSE: Resting tremor is one of the cardinal motor features of Parkinson's disease (PD). Several lines of evidence suggest resting tremor may have different underlying pathophysiological processes from those of bradykinesia and rigidity. The current study aims to identify white matter microstructural abnormalities associated with resting tremor in PD. METHODS: We recruited 60 patients with PD (30 with tremor-dominant PD and 30 with nontremor-dominant PD) and 26 normal controls...
May 24, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28539509/fin-fold-development-in-paddlefish-and-catshark-and-implications-for-the-evolution-of-the-autopod
#13
Frank J Tulenko, James L Massey, Elishka Holmquist, Gabriel Kigundu, Sarah Thomas, Susan M E Smith, Sylvie Mazan, Marcus C Davis
The evolutionary origin of the autopod involved a loss of the fin-fold and associated dermal skeleton with a concomitant elaboration of the distal endoskeleton to form a wrist and digits. Developmental studies, primarily from teleosts and amniotes, suggest a model for appendage evolution in which a delay in the AER-to-fin-fold conversion fuelled endoskeletal expansion by prolonging the function of AER-mediated regulatory networks. Here, we characterize aspects of paired fin development in the paddlefish Polyodon spathula (a non-teleost actinopterygian) and catshark Scyliorhinus canicula (chondrichthyan) to explore aspects of this model in a broader phylogenetic context...
May 31, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28539338/expression-of-trans-and-paracellular-calcium-and-magnesium-transport-proteins-in-renal-and-intestinal-epithelia-during-lactation
#14
Megan R Beggs, Ida Appel, Per Svenningsen, Karsten Skjødt, R Todd Alexander, Henrik Dimke
Significant alterations in maternal calcium (Ca2+) and magnesium (Mg2+) balance occur during lactation. Ca2+ is the primary divalent cation mobilized into breast milk by demineralization of the skeleton and alterations in intestinal and renal Ca2+ transport. Mg2+ is also concentrated in breast milk, but the underlying mechanisms are not well understood. To determine the molecular alterations in Ca2+ and Mg2+ transport in the intestine and kidney during lactation, 3 groups of female mice consisting of either non-pregnant controls, lactating mice, or mice undergoing involution were examined...
May 24, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28538062/the-development-of-surgery-of-the-craniofacial-skeleton-a-march-from-south-to-north-or-caudad-to-cephalad
#15
Beth Aviva Preminger, Joseph G McCarthy
No abstract text is available yet for this article.
May 19, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28537626/highly-transparent-supercapacitors-based-on-zno-mno2-nanostructures
#16
M A Borysiewicz, M Ekielski, Z Ogorzałek, M Wzorek, J Kaczmarski, T Wojciechowski
The recent rapid development of transparent electronics, notably displays and control circuits, requires the development of highly transparent energy storage devices, such as supercapacitors. The devices reported to date utilize carbon-based electrodes for high performance, however at the cost of their low transparency around 50%, insufficient for real transparent devices. To overcome this obstacle, in this communication highly transparent supercapacitors were fabricated based on ZnO/MnO2 nanostructured electrodes...
May 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28537411/-treatment-of-pelvic-avulsion-fractures-in-children-and-adolescents
#17
A Stančák, J Kautzner, T Trč, V Havlas
INTRODUCTION: Paediatric avulsion fractures of the pelvis and hip joint are rare injuries most commonly associated with a rapid muscle contraction of the respected apophysis, which is the weakest component of the growing skeleton. The chosen therapy option can be either conservative or surgical. METHODS: We present a cohort of 69 patients treated for an apophyseal avulsion fracture of the anterior superior / inferior iliac spine, the lesser and greater trochanters iliac crest and the ischial tubercle...
2017: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/28537078/asymmetric-synthesis-of-the-tetraponerine-alkaloids
#18
Stephen G Davies, Ai M Fletcher, Ian T T Houlsby, Paul M Roberts, James E Thomson
The asymmetric syntheses of all eight tetraponerine alkaloids (T1-T8) were achieved using the diastereoselective conjugate additions of lithium amide reagents in the key stereodefining steps. Conjugate addition of either lithium (R)-N-allyl-N-(α-methylbenzyl)amide or lithium (R)-N-(but-3-en-1-yl)-N-(α-methylbenzyl)amide to tert-butyl sorbate was followed by ring-closing metathesis of the resultant N-alkenyl β-amino esters, reduction to the corresponding aldehydes, and reaction with tert-butyl (triphenylphosphoranylidene)acetate...
May 24, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28535384/invertebrate-biomechanics
#19
S N Patek, A P Summers
Invertebrate biomechanics focuses on mechanical analyses of non-vertebrate animals, which at root is no different in aim and technique from vertebrate biomechanics, or for that matter the biomechanics of plants and fungi. But invertebrates are special - they are fabulously diverse in form, habitat, and ecology and manage this without the use of hard, internal skeletons. They are also numerous and, in many cases, tractable in an experimental and field setting. In this Primer, we will probe three axes of invertebrate diversity: worms (Phylum Annelida), spiders (Class Arachnida) and insects (Class Insecta); three habitats: subterranean, terrestrial and airborne; and three integrations with other fields: ecology, engineering and evolution...
May 22, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28535344/clarifying-the-controversial-catalytic-performance-of-co-oh-2-and-co3o4-for-oxygen-reduction-evolution-reactions-toward-efficient-zn-air-batteries
#20
Zhishuang Song, Xiaopeng Han, Yida Deng, Naiqin Zhao, Wenbin Hu, Cheng Zhong
Cobalt-based nanomaterials have been widely studied as catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to their remarkable bifunctional catalytic activity, low cost and easy available. However, controversial results concerning OER/ORR performance exist between different types of cobalt-based catalysts, especially for Co(OH)2 and Co3O4. To address this issue, we develop a facile electrochemical deposition method to grow Co(OH)2 directly on the skeleton of carbon cloth, and further Co3O4 was obtained by post thermal treatment...
May 23, 2017: ACS Applied Materials & Interfaces
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