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Duplex systems

Hongmei Fang, Nuli Xie, Min Ou, Jin Huang, Wenshan Li, Qing Wang, Jianbo Liu, Xiaohai Yang, Kemin Wang
Nucleic acids, as one kind of significant biomarkers, have attracted tremendous attention and exhibited immense value in fundamental studies and clinical applications. In this work, we developed a fluorescent assay for detecting nucleic acids in complex samples based on magnetic microbead (MMB)-assisted catalyzed hairpin assembly (CHA) and donor donor-acceptor fluorescence resonance energy transfer ("DD-A" FRET) signaling mechanism. Three types of DNA hairpin probes were employed in this system, including Capture, H1 (double FAM-labelled probe as FRET donor) and H2 (TAMRA-labelled probe as FRET acceptor)...
May 21, 2018: Analytical Chemistry
Valentina Rovella, Michele Ferrannini, Manfredi Tesauro, Giulia Marrone, Andrea Busca, Roberto Sorge, Simone Manca di Villahermosa, Maurizio Casasco, Nicola Di Daniele, Annalisa Noce
BACKGROUND AND AIM: The synthetic drug fenoldopam mesylate (FM) may have a renoprotective role, and a "renal dose" of 0.1 µg/kg/min intravenous (IV) infusion of FM has been reported as able to increase renal blood flow without affecting systemic blood pressure. But conclusive data are still lacking. We aimed to investigate by color-Doppler ultrasonography the effects of IV administration of FM at this dosage in hypertensive chronic kidney disease (CKD) patients, and verify whether it may induce any systemic hemodynamic alteration...
May 15, 2018: Journal of Nephrology
Junheng Gao, John Nutter, Xingguang Liu, Dikai Guan, Yuhe Huang, David Dye, W Mark Rainforth
In β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties. An as-cast Ti-9Mo-6W alloy exhibited segregation of Mo and W at the tens of micrometre scale. This was subjected to cold rolling and flash annealing at 820 o C for 2 and 5 mins...
May 14, 2018: Scientific Reports
Sherif Salah Azab, Hossam El Din Hosni, Taha A El Far, Nashaat Nabil Ismail, Yasser K El Bakdady, Ahmed F Mohamed
BACKGROUND: Erectile dysfunction (ED) is assumed to be connected with vascular disease caused by endothelial dysfunction, and characterized by the incapability of the smooth muscle cells lining the arterioles to relax, therefore, inhibit vasodilatation. AIM: To assess the predictive value of arteriogenic ED for coronary artery disease in men above the age of 40 years. METHODS: 75 Patients reporting arteriogenic ED and 25 men with normal erectile function were enrolled in the study...
May 11, 2018: Journal of Sexual Medicine
Domenica Musumeci, Valentina Roviello, Giovanni N Roviello
Background: Nucleobase-bearing peptides and their interaction with DNA and RNA are an important topic in the development of therapeutic approaches. On one hand, they are highly effective for modulating the nucleic-acid-based biological processes. On the other hand, they permit to overcome some of the main factors limiting the therapeutic efficacy of natural oligonucleotides, such as their rapid degradation by nucleases. Methods and results: This article describes the synthesis and characterization of a novel thymine-bearing nucleoamino acid based on the l-diaminopropionic acid (l-Dap) and its solid phase oligomerization to α-peptides (oligoDapT), characterized using mass spectrometry, spectroscopic techniques, and scanning electron microscopy (SEM) analysis...
2018: International Journal of Nanomedicine
Sarah Lumsden, Gabor Rosta, Jean Bismuth, Alan B Lumsden, Zsolt Garami
Dissection of the internal carotid artery (ICA) accounts for 5% to 25% of ischemic strokes in young adults. We report a case of spontaneous recanalization of a traumatic ICA dissection in which carotid duplex (CDU) and transcranial color-coded duplex ultrasound (TCCD) were used. A 47-year-old male presented with intermittent episodes of headache, blurry vision, anisocoria, and loss of taste sensation following a whiplash injury while body surfing. Magnetic resonance angiogram (MRA) of the neck revealed absent flow in the cavernous ICA and a clot at the skull base...
October 2017: Methodist DeBakey Cardiovascular Journal
Snjezana Milicevic, Radojka Bijelic, Vladimir Krivokuca, Branislava Jakovljevic
Introduction: Duplicated ureter or Duplex Collecting System is a congenital condition in which the ureteric bud, the embryological origin of the ureter, arises twice, resulting in two ureters draining a single kidney. This congenital anomaly is rare, and even rarer when the duplex system with ectopic ureter is present. This type of congenital anomaly is even more rarely diagnosed and surgically treated in adulthood. Case report: This case report presents a case of a 32-year-old male, who had a duplex collecting system with two ureters on the left side...
April 2018: Medical Archives
C Prior, L Danilāne, V S Oganesyan
We report the first application of fully atomistic molecular dynamics (MD) simulations to the prediction of electron paramagnetic resonance (EPR) spectra of spin labelled DNA. Models for two structurally different DNA spin probes with either the rigid or flexible position of the nitroxide group in the base pair, employed in experimental studies previously, have been developed. By the application of the combined MD-EPR simulation methodology we aimed at the following. Firstly, to provide a test bed against a sensitive spectroscopic technique for the recently developed improved version of the parmbsc1 force field for MD modelling of DNA...
May 4, 2018: Physical Chemistry Chemical Physics: PCCP
Chao Liu, Christopher Cozens, Faten Jaziri, Jef Rozenski, Amandine Maréchal, Shrinivas G Dumbre, Valérie Pezo, Philippe Marliere, Vitor B Pinheiro, Elisabetta Groaz, Piet Herdewijn
Although several synthetic or xenobiotic nucleic acids (XNAs) have been shown to be viable genetic materials in vitro, major hurdles remain for their in vivo applications, particularly orthogonality. The availability of XNAs that do not interact with natural nucleic acids and are not affected by natural DNA processing enzymes, as well as specialized XNA processing enzymes that do not interact with natural nucleic acids, are essential. Here, we report 3'-2' phosphonomethyl-threosyl nu-cleic acid (tPhoNA) as a novel XNA genetic material and a prime candidate for in vivo XNA applications...
May 3, 2018: Journal of the American Chemical Society
Rachel Sari Riley, Megan Ngoc Dang, Margaret Marie Billingsley, Baxter Abraham, Lars Gundlach, Emily S Day
The ability to regulate intracellular gene expression with exogenous nucleic acids such as small interfering RNAs (siRNAs) has substantial potential to improve the study and treatment of disease. However, most transfection agents and nanoparticle-based carriers that are used for the intracellular delivery of nucleic acids cannot distinguish between diseased and healthy cells, which may cause them to yield unintended widespread gene regulation. An ideal delivery system would only silence targeted proteins in diseased tissue in response to an external stimulus...
April 27, 2018: Nano Letters
Hassana Ibrahim Mustapha, Pankaj Kumar Gupta, Brijesh Kumar Yadav, J J A van Bruggen, P N L Lens
A duplex constructed wetland (duplex-CW) is a hybrid system that combines a vertical flow (VF) CW as a first stage with a horizontal flow filter (HFF) as a second stage for a more efficient wastewater treatment as compared to traditional constructed wetlands. This study evaluated the potential of the hybrid CW system to treat influent wastewater containing diesel range organic compounds varying from C7 - C40 using a series of 12-week practical and numerical experiments under controlled conditions in a greenhouse (pH was kept at 7...
April 9, 2018: Chemosphere
Gregor J Kocher, Adrian Zehnder, Jon A Lutz, Juerg Schmidli, Ralph A Schmid
OBJECTIVE: First rib resection is a well-recognized treatment option for thoracic outlet syndrome (TOS). In case of a vascular insufficiency that can be provoked and/or progressive neurologic symptoms without response to conservative treatment, surgical decompression of the space between the clavicle and the first rib is indicated. The aim of this paper is to present our experience with a new minimally invasive robotic approach using the da Vinci Surgical System®. METHODS: Between January 2015 and October 2017, eight consecutive first rib resections in seven patients were performed at our institution...
April 25, 2018: World Journal of Surgery
N V Lukyanchikova, I O Petruseva, A N Evdokimov, L S Koroleva, O I Lavrik
Model DNA molecules that contain bulky lesions in both strands have been created, and their properties as substrates of the nucleotide excision repair (NER) system have been analyzed. The modified nucleoside, 5-[3-(4-azido-2,3,5,6-tetrafluorobenzamido)-1-propoxypropyl]-2'-deoxycytidine (dC^(FAB)), or the nonnucleoside fragment, N-[6-(9-anthracenylcarbamoyl)hexanoyl]-3-amino-1,2-propanediol (nAnt), have been inserted as damage in certain positions of the first DNA strand ("0"). The position of N-[6-5(6)-fluoresceinylcarbamoyl]hexanoyl] -3-amino-1,2-propanediol (nFlu) has been varied within the second DNA strand...
March 2018: Molekuliarnaia Biologiia
Laurence Vachot-Ganée, Nimol Khim, Alexandra Iannello, Eric Legrand, Saorin Kim, Rotha Eam, Chanra Khean, Malen Ken, Elizabeth Ashley, Kyaw Myo Tun, Mehul Dhorda, François Nosten, Issa Mahamat Souleymane, Sophie Blein, Alexandre Pachot, Frédéric Ariey, Karine Kaiser, Didier Ménard
BACKGROUND: Given the risk of artemisinin resistance spreading from the Greater Mekong sub-region, prospective monitoring in sub-Saharan Africa should be expedited. Molecular biology techniques used for monitoring rely on the detection of k13 validated mutants by using PCR and Sanger sequencing approach, usually not available in malaria endemic areas. METHODS: A semi-automated workflow based on the easyMAG® platform and the Argene Solution® (bioMérieux, Marcy l'Etoile, France) as a field-based surveillance tool operable at national level was developed in four steps...
April 24, 2018: Malaria Journal
Romaric Bonnet, Carole Farre, Lionel Valera, Ludivine Vossier, Fanny Léon, Typhaine Dagland, Agnès Pouzet, Nicole Jaffrézic-Renault, Jeannette Fareh, Chantal Fournier-Wirth, Carole Chaix
A nanoparticle-based electrochemical sandwich immunoassay was developed for bacteria detection in platelet concentrates. For the assay, magnetic beads were functionalized with antibodies to allow the specific capture of bacteria from the complex matrix, and innovative methylene blue-DNA/nanoparticle assemblies provided the electrochemical response for amplified detection. This nanoparticular system was designed as a temperature-sensitive nano-tool for electrochemical detection. First, oligonucleotide-functionalized nanoparticles were obtained by direct synthesis of the DNA strands on the nanoparticle surface using an automated oligonucleotide synthesizer...
April 24, 2018: Analyst
Yukiko Kamiya, Yu Arimura, Hideaki Ooi, Kenjiro Kato, Xingguo Liang, Hiroyuki Asanuma
10-23 DNAzyme is an artificially developed functional oligonucleotide, which can cleave RNA in a sequence-specific manner. In this study, we designed a new photo-driven DNAzyme possessing a photo-responsive DNA overhang complementary to the catalytic core region. The photo-responsive overhang region of the DNAzyme included either azobenzenes (Azos) or 2,6-dimethyl-4-(methylthio)azobenzenes (SDM-Azos) introduced via a D-threoninol linker. When the Azos or SDM-Azos were in the trans form, the photo-responsive DNA overhang hybridized with the DNAzyme, and the RNA cleavage activity was suppressed...
April 22, 2018: Chembiochem: a European Journal of Chemical Biology
Wen-Min Qin, Xue-Wei Wang, Takuo Sawahata, Li-Wei Zhou
Phylloporia , in the Hymenochaetaceae, is a polypore genus with a worldwide distribution. The new taxon Phylloporia lonicerae is introduced, which is the first Phylloporia species to originate from Japan. This species grows exclusively on living Lonicera japonica and is distinguished by annual, sessile basidiocarps that occur in clusters, pileal surface of narrow, concentrically sulcate zones, 6-8 pores per mm, duplex context separated by a black zone, dimitic hyphal system and broadly ellipsoid basidiospores, 3...
2018: MycoKeys
Roberto Gabrielli, Maria Sofia Rosati, Massiliano Millarelli, Angelica Dante, Maurizio Maiorano, Aldo Musilli, Roberto Chiappa, Marco Ventura
BACKGROUND: Common femoral artery is still the most frequently site used for vascular access, mostly for peripheral arterial interventions and its puncture remains a significant source of patient's morbidity. Manual compression (MC) has been the gold standard for hemostasis after femoral catheterization until recently, but only in the last few years, vascular closure devices (VCDs) are replacing MC due to their rapid development. Nowadays also vascular surgeons are becoming familiar with VCDs...
April 17, 2018: Annals of Vascular Surgery
Haijian Tu, Kun Lin, Yongzhi Lun, Liuming Yu
A digital detection strategy based on a portable personal glucometer (PGM) was developed for the simple, rapid, and sensitive detection of hepatitis C virus (HCV) RNA, involving the release of glucose-loaded nanoliposomes due to coupling-site-specific cleavage by the endonuclease BamHI. The glucose-loaded nanoliposomes were synthesized using a reversed-phase evaporation method and provided an amplified signal at the PGM in the presence of HCV RNA. Initially, a 21-mer oligonucleotide complementary to HCV RNA was covalently conjugated to a magnetic bead through the amino group at the 5' end of the oligonucleotide, and then bound to a glucose-loaded liposome by typical carbodiimide coupling at its 3' end...
April 17, 2018: Analytical and Bioanalytical Chemistry
Jonas Mücksch, Philipp Blumhardt, Maximilian T Strauss, Eugene P Petrov, Ralf Jungmann, Petra Schwille
We present a simple and versatile single molecule-based method for the accurate determination of binding rates to surfaces or surface bound receptors. To quantify the reversible surface attachment of fluorescently labeled molecules, we have modified previous schemes for Fluorescence Correlation Spectroscopy with Total Internal Reflection illumination (TIR-FCS) and camera-based detection. In contrast to most modern applications of TIR-FCS, we completely disregard spatial information in lateral direction. Instead, we perform correlation analysis on a spatially integrated signal, effectively converting the illuminated surface area into the measurement volume...
April 16, 2018: Nano Letters
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