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https://www.readbyqxmd.com/read/28812355/adaptively-recognizing-parallel-stranded-duplex-structure-for-fluorescent-dna-polarity-analysis
#1
Mei-Yun Ye, Rui-Tao Zhu, Xiang Li, Xiao-Shun Zhou, Zheng-Zhi Yin, Qian Li, Yong Shao
Besides the canonical Watson-Crick (WC) linked antiparallel-stranded duplex (aps-DNA), DNA is also able to form bioactive parallel-stranded duplex (ps-DNA) with the two involving strands adopting the equal 5'-3' polarity. Discriminating ps-DNA from aps-DNA with an ideal selectivity is more challenging because of their comparable duplex topologies. Herein, we designed a unique probe of HPIN to fluorescently recognize ps-DNA but to keep an almost nonfluorescent response in binding with aps-DNA. The success of the Hoogsteen hydrogen bonding pattern in lighting up the HPIN fluorescence over the reverse Watson-Crick (rWC) one suggests the critical role of HPIN in structurally adaptive recognition to the strand polarity-determined base-pairing peculiarity...
August 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28811025/simultaneous-detection-of-two-hepatocellar-carcinoma-related-micrornas-using-a-clever-single-labeled-fluorescent-probe
#2
Rong Liao, Shiyu Li, Huan Wang, Chunyan Chen, Xiaoming Chen, Changqun Cai
The simultaneous detection of two important microRNAs (miRNAs) can potentially evaluate pathological states. The simultaneous detection of miRNA-26a and miRNA-122 is proposed in this study using a cleverly designed single-labeled, dual-functional fluorescent probe with a 2-aminopurine as a fluorophore, which is a G-quadruplex single-stranded DNA. The probe can partly complement cDNA-1 and cDNA-2. cDNA-1 and cDNA-2 are complementary strands of miRNA-26a and miRNA-122, respectively. When the target miRNAs are added simultaneously, these cDNA (cDNA-1 and cDNA-2) can be competed off from the cDNA∖probe duplex to form a cDNA∖RNA heteroduplex...
August 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28810234/electrochemical-aptamer-based-nanosensor-fabricated-on-single-au-nanowire-electrodes-for-adenosine-triphosphate-assay
#3
Dongmei Wang, Xiaoqing Xiao, Shen Xu, Yong Liu, Yongxin Li
In this work, single Au nanowire electrodes (AuNWEs) were fabricated by laser-assisted pulling/hydrofluoric acid (HF) etching process, which then were characterized by transmission electron microscopy (TEM), electrochemical method and finite-element simulation. The as-prepared single AuNWEs were used to construct electrochemical aptamer-based nanosensors (E-AB nanosensors) based on the formation of Au-S bond that duplex DNA tagged with methylene blue (MB) was modified on the surface of electrode. In the presence of adenosine triphosphate (ATP), the MB-labeled aptamer dissociated from the duplex DNA due to the strong specific affinity between aptamer and target, which lead to the reduction of MB electrochemical signals...
August 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28809680/high-performance-saw-resonator-on-new-multi-layered-substrate-using-litao3-crystal
#4
Tsutomu Takai, Hideki Iwamoto, Yuichi Takamine, Hisashi Yamazaki, Toshiyuki Fuyutsume, Haruki Kyoya, Takeshi Nakao, Hajime Kando, Masahiro Hiramoto, Takanori Toi, Masayoshi Koshino, Norio Nakajima
To develop the high performance filters and duplexers required for recent LTE frequency bands in mobile handsets, a surface acoustic wave (SAW) resonator is needed that have higher quality (Q) and a lower temperature coefficient of frequency (TCF). To achieve this, the authors focused on acoustic energy confinement in the depth direction for a rotated Y-X LiTaO3 (LT) substrate. Characteristics of multi-layered substrates with low impedance and high impedance layers under LT layer were studied numerically in terms of acoustic energy distribution, phase velocity, coupling coefficient and temperature characteristics employing a finite element method (FEM) simulation...
August 10, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28809462/multiple-electronic-and-structural-factors-control-cpd-and-6-4-thymine-thymine-photodimerization-in-dna-duplex
#5
Irene Conti, Lara Martinez Fernandez, Luciana Esposito, Siegfried Hofinger, Artur Nenov, Marco Garavelli, Roberto Improta
The T-T photodimerization paths leading to the formation of cyclobutane pyrimidine dimer (CPD) and 6-4 pyrimidine pyrimidone (64-PP), the two main DNA photolesions, have been resolved for a T-T step in a DNA duplex by two complementary state-of-the art quantum mechanical approaches: QM(CASPT2//CASSCF)/MM and TD-DFT/PCM. Based on the analysis of several different representative structures, we define a new-ensemble of cooperating geometrical and electronic factors (besides the distance between the reacting bonds) ruling T-T photodimerization in DNA...
August 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28809425/ph-responsive-quencher-free-molecular-beacon-systems-containing-2-deoxyuridine-units-labeled-with-fluorene-derivatives
#6
Ji Won Lee, Ye-Seul Son, Jun Yeon Hwang, Yoojin Park, Gil Tae Hwang
Three fluorescent nucleosides-U(FL), U(AF), and U(DAF), containing fluorene, 2-aminofluorene, and 2-dimethylaminofluorene units, respectively, covalently attached to 2'-deoxyuridine-have been incorporated into the central positions of oligodeoxynucleotides (ODNs) to examine the effects of their flanking bases (FBs) and pH on the emission properties upon hybridization with fully matched and single-base-mismatched targets. The ODN containing U(FL) and cytosine-FBs in the pH range from 5.5 to 8.0 and the ODN containing U(DAF) and cytosine-FBs under slightly acidic conditions (pH 6...
August 15, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28808735/-diagnostics-and-endovascular-treatment-of-venous-diseases
#7
L Kamper, A Altenburg, M Das, P Haage
In venous disease, acute thromboses and chronic venous insufficiency have the highest health economics relevance. Duplex sonography is the first line diagnostic assessment tool, while cross-sectional imaging is employed as a supplementary method. Due to the availability and examination times computed tomography is preferred in the emergency setting and is supplemented by magnetic resonance imaging (MRI) for specific questions. Endovascular treatment procedures are increasingly becoming available in addition to classical conservative treatment methods...
August 14, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28808360/bemiparin-versus-enoxaparin-in-the-prevention-of-venous-thromboembolism-among-intensive-care-unit-patients
#8
Mohamed Sayed Abbas
BACKGROUND: Critically ill patients are considered a high-risk group for developing venous thromboembolism (VTE). Due to their impaired cardiopulmonary reserve, these VTEs may result in significant morbidity and mortality. In this study, we compared two types of low molecular weight heparin, enoxaparin, and bemiparin, as regards to their efficacy and safety in VTE prevention among Intensive Care Unit (ICU) patients. METHODS: This study was a prospective, randomized trial of 100 critically ill patients who are at high risk for developing VTE were included in this study and assigned to receive subcutaneous injections of either 3500 international units (IU) anti-factor Xa of bemiparin sodium or 40 mg of enoxaparin given once a day and patient were followed for 60 days after initiation of anticoagulant therapy for the development of documented deep venous thrombosis (DVT) using bilateral lower limb venous duplex, documented pulmonary embolism using computed tomography pulmonary angiography, and complications related to injectant anticoagulant...
July 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28807045/a-randomized-multi-center-prospective-study-comparing-best-medical-treatment-versus-best-medical-treatment-plus-renal-artery-stenting-in-patients-with-hemodynamically-relevant-atherosclerotic-renal-artery-stenosis-radar-one-year-results-of-a-pre-maturely-terminated
#9
Thomas Zeller, Hans Krankenberg, Andrejs Erglis, Erwin Blessing, Torsten Fuss, Dierk Scheinert, Ralf Weser, Beatrix B Doerr, Wilfrid D Yollo, Joerg Radermacher
BACKGROUND: The indications for conservative "best medical treatment" (BMT) versus additional renal artery stenting are a matter of ongoing debate. The RADAR study aimed to evaluate the impact of percutaneous renal artery stenting on the impaired renal function in patients with hemodynamically significant atherosclerotic renal artery stenosis (RAS). METHODS: RADAR is an international, prospective, randomized (1:1) controlled study comparing BMT alone versus BMT plus renal artery stenting in patients with duplex sonographic hemodynamically relevant RAS...
August 14, 2017: Trials
https://www.readbyqxmd.com/read/28805877/a-dna-bipedal-nanowalker-with-a-piston-like-expulsion-stroke
#10
Q Y Yeo, I Y Loh, S R Tee, Y H Chiang, J Cheng, M H Liu, Z S Wang
Artificial molecular walkers beyond burn-bridge designs are important for nanotechnology, but their systematic development remains difficult. Herein, we have reported a new rationally designed DNA walker-track system and experimentally verified a previously proposed general expulsion regime for implementing non-burn-bridge nanowalkers. The DNA walker has an optically powered engine motif that reversibly extends and contracts the walker via a quadruplex-duplex conformational change. The walker's extension is an energy-absorbing and force-generating process, which drives the walker's leg dissociation off-track in a piston-like expulsion stroke...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28802585/genomics-of-the-new-species-kingella-negevensis-diagnostic-issues-identification-of-a-locus-encoding-a-rtx-toxin
#11
Onya Opota, Sacha Laurent, Trestan Pillonel, Marie Léger, Sabrina Trachsel, Guy Prod'hom, Katia Jaton, Gilbert Greub
Kingella kingae, producing the cytotoxic RTX protein, is a causative agent of serious infections in humans such as bacteremia, endocarditis and osteoarticular infection, especially in young children. Recently, Kingella negevensis, a related species, has been isolated from the oral cavity of healthy children. In this study, we report the isolation of K. negevensis strain eburonensis, initially misidentified as K. kingae with MALDI-TOF MS, from a vaginal specimen of a patient suffering of vaginosis. The genome sequencing and analysis of this strain together with comparative genomics of the Kingella genus revealed that K...
August 9, 2017: Microbes and Infection
https://www.readbyqxmd.com/read/28799135/appendiceal-duplication-a-comprehensive-review-of-published-cases-and-clinical-recommendations
#12
H Nageswaran, U Khan, F Hill, A Maw
BACKGROUND: Duplex appendix is very rare (incidence 0.004%) but has clinical relevance given the frequency of appendicectomies performed. Failure to recognise duplication can result in failure of treatment and medico-legal consequences. A review of published cases was undertaken to identify factors that may help in managing this rare condition. METHODS: All English and non-English publications were identified in PubMed, Embase and Cochrane databases. Patient demographics, intraoperative findings, anatomical details and histopathology were analysed...
August 10, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28798785/simultaneous-vertebral-and-subclavian-artery-stenting
#13
Damian R Maciejewski, Łukasz Tekieli, Roman Machnik, Anna Kabłak-Ziembicka, Tadeusz Przewłocki, Piotr Paluszek, Mariusz Trystuła, Robert Musiał, Karolina Dzierwa, Piotr Pieniążek
INTRODUCTION: Vertebrobasilar territory ischemia leads to disabling neurological symptoms and may be caused both by vertebral artery (VA) and subclavian artery (SA) stenosis. The coexisting symptomatic ipsilateral VA and proximal SA stenosis should be considered as a true bifurcation lesion for percutaneous treatment. AIM: To evaluate the safety and efficacy of simultaneous angioplasty of vertebral and subclavian stenosis. MATERIAL AND METHODS: Fifteen patients (age 69...
2017: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/28798783/mesh-covered-roadsaver-stent-as-a-new-treatment-modality-for-symptomatic-or-high-risk-carotid-stenosis
#14
Roman Machnik, Piotr Paluszek, Łukasz Tekieli, Karolina Dzierwa, Damian Maciejewski, Mariusz Trystuła, Andrzej Brzychczy, Krzysztof Banaszkiewicz, Robert Musiał, Piotr Pieniążek
INTRODUCTION: Prevention of periprocedural stroke has a crucial role in carotid artery stenting (CAS) procedures. AIM: To assess retrospectively 30-day safety and effectiveness of 41 procedures of internal and common carotid artery stenting using the Roadsaver double nitinol layer micromesh stent in 40 non-consecutive patients with symptomatic or high-risk carotid artery stenosis. MATERIAL AND METHODS: The patients were men (n = 31) and women (n = 9); mean age was 67...
2017: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/28798779/one-swallow-does-not-a-summer-make-but-many-swallows-do-accumulating-clinical-evidence-for-nearly-eliminated-peri-procedural-and-30-day-complications-with-mesh-covered-stents-transforms-the-carotid-revascularisation-field
#15
REVIEW
Piotr Musiałek, L Nelson Hopkins, Adnan H Siddiqui
Atherosclerotic carotid artery stenosis (CS) continues to be a common cause of acute ischaemic stroke. Optimised medical therapy (OMT), the first-line treatment modality in CS, may reduce or delay - but it does not abolish - CS-related strokes. As per current AHA/ASA and ESC/ESVS/ESO guidelines, carotid artery stenting (CAS) is a less-invasive alternative to carotid endarterectomy (CEA) for CS revascularisation in primary and secondary stroke prevention. Ten-year follow-up from the CREST trial in patients with symptomatic and asymptomatic CS confirmed equipoise of CAS and CEA in the primary endpoint...
2017: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/28798248/giant-hydronephrosis-in-a-case-of-ureterocele-with-duplex-system-an-entity-yet-not-reported
#16
Ruchir Aeron, Ashok Kumar Sokhal, Manoj Kumar, Satyanarayan Sankhwar
Ureterocele, which is a cystic dilatation of the terminal ureter, is usually associated with the upper moiety in a case of the duplex system. Giant hydronephrosis, a rare entity, is usually due to pelviureteric junction obstruction and is usually diagnosed in infants and children. We report a unique case of a unilateral complete duplex system with ureterocele with giant hydronephrosis of the upper moiety in an adult woman presenting as an abdominal lump. To the best of our knowledge, this is the first case of giant hydronephrosis associated with ureterocele in an adult patient...
August 10, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28797661/patency-and-clinical-outcome-after-stent-placement-for-chronic-obstruction-of-the-inferior-vena-cava
#17
O Grøtta, T Enden, G Sandbæk, G F Gjerdalen, C-E Slagsvold, D Bay, N-E Kløw, A Rosales
OBJECTIVE/BACKGROUND: The objective was to assess the technical success, patency, and clinical outcome after stent placement for chronic obstruction of the inferior vena cava (IVC). METHODS: A retrospective analysis was carried out of patients with chronic IVC obstruction verified with computed tomography and/or magnetic resonance venography, accepted for stent placement at the Norwegian National Unit for Reconstructive Deep Venous Surgery from March 2010 to September 2015...
August 7, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28796991/epidemiology-of-intracranial-and-extracranial-large-artery-stenosis-in-a-population-based-study-of-stroke-in-the-middle-east
#18
Hamidreza Saber, Amin Amiri, Amanda G Thrift, Saverio Stranges, Reza Bavarsad Shahripour, Mohammad T Farzadfard, Naghmeh Mokhber, Réza Behrouz, Mahmoud Reza Azarpazhooh
BACKGROUND: Intracranial large-artery disease (LAD) is a predominant vascular lesion found in patients with stroke of Asian, African, and Hispanic origin, whereas extracranial LAD is more prevalent among Caucasians. These patterns are not well-established in the Middle East. We aimed to characterize the incidence, risk factors, and long-term outcome of LAD strokes in a Middle-Eastern population. METHODS: The Mashhad Stroke Incidence Study is a community-based study that prospectively ascertained all cases of stroke among the 450,229 inhabitants of Mashhad, Iran between 2006 and 2007...
August 11, 2017: Neuroepidemiology
https://www.readbyqxmd.com/read/28795795/mass-defect-based-dimethyl-pyrimidinyl-ornithine-dipyro-tags-for-multiplex-quantitative-proteomics
#19
Dustin C Frost, Amanda R Buchberger, Lingjun Li
We have developed a novel amine-reactive mass defect-based chemical tag, dimethyl pyrimidinyl ornithine (DiPyrO), that is compact in size, is suitable for various biological samples, and enables highly multiplexed quantification of peptides at the MS1 level without increasing mass spectral complexity. The DiPyrO tag structure incorporates heavy isotopes in a variety of configurations to impart as much as 45.3 mDa or as little as 5.8 mDa per tag between labeled peptides. Notably, peptides containing lysine are labeled with two tags, doubling the imparted mass defect to up to 90...
August 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28795695/structural-stability-of-the-photo-responsive-dna-duplexes-containing-one-azobenzene-via-a-confined-pore
#20
Fu-Na Meng, Zi-Yuan Li, Yi-Lun Ying, Shao-Chuang Liu, Junji Zhang, Yi-Tao Long
Herein, the structural stability of single azobenzene modified DNA duplexes, including the trans form and cis form, has been examined separately based on their distinguishable unzipping kinetics from the mixture by an α-hemolysin nanopore. Furthermore, the accurate isomerization efficiency between the trans and cis form was obtained with single molecule resolution.
August 10, 2017: Chemical Communications: Chem Comm
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