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https://www.readbyqxmd.com/read/29762608/fabrication-of-controllably-variable-sub-100-nm-gaps-in-silver-nanowires-by-photothermal-induced-stress
#1
Pintu Ghosh, Jinsheng Lu, Hao Luo, Ziquan Xu, Xiaoyuan Yan, Yewu Wang, Jun Lu, Min Qiu, Qiang Li
A technique to fabricate nanogaps with controllably variable gap width in silver (Ag) nanowires (NWs) by photothermal-induced stress utilizing a focused continuous-wave laser (532 nm) is presented. For the case of an Ag NW on gold thin film, a gap width starting from ∼20  nm is achieved with a critical minimum power (CMP) of about 160 mW, whereas in the case of an Ag NW placed on top of a zinc oxide NW, the attained gap width is as small as a few nm (<10  nm) with a CMP of only ∼100  mW...
May 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29728953/electrocardiography-based-prediction-of-hypertrophy-pattern-and-fibrosis-amount-in-hypertrophic-cardiomyopathy-comparative-study-with-cardiac-magnetic-resonance-imaging
#2
Chul Hwan Park, Hyemoon Chung, Yoonjung Kim, Jong-Youn Kim, Pil-Ki Min, Kyung-A Lee, Young Won Yoon, Tae Hoon Kim, Byoung Kwon Lee, Bum-Kee Hong, Se-Joong Rim, Hyuck Moon Kwon, Eui-Young Choi
Although, cardiac magnetic resonance imaging (CMR) is a gold standard for risk stratification of hypertrophic cardiomyopathy (HCM), is limited in some situations. We sought to evaluate the predictive power of quantitative electrocardiography in assessing hypertrophy pattern and fibrosis in HCM. Eighty-eight patients with HCM were studied. Voltage of R-S-T waves, number of fragmented QRS (fQRS) complexes, and T wave morphology were measured by 12-lead electrocardiography. Sixteen segmental thickness, late gadolinium enhancement (LGE), native T1, extracellular volume fraction (ECV), and T2, left ventricular (LV) mass and %LGE were measured by CMR...
May 4, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29684734/one-pot-synthesis-of-dandelion-like-polyaniline-coated-gold-nanoparticles-composites-for-electrochemical-sensing-applications
#3
Zhiwei Lu, Wanlin Dai, Baichen Liu, Guangquan Mo, Junjun Zhang, Jiaping Ye, Jianshan Ye
In this work, we report a facile and green strategy for one pot and in-situ synthesis of a dandelion-like conductive polyaniline coated gold nanoparticle nanocomposites (Au@PANI). The Au@PANI was characterized by SEM, TEM, XRD, TGA, FTIR, UV-vis and conductivity measurement, respectively. Newly-designed Au@PANI materials possessed a significantly high conductivity and strong adsorption capability. Thus, the Au@PANI modified glassy carbon electrode (GCE) was utilized for construct a novel electrochemical sensor for the simultaneous assay of Pb2+ and Cu2+ using square wave anodic stripping voltammetry (SWASV)...
April 18, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29675760/comparison-of-efficiency-of-the-retreatment-procedure-between-wave-one-gold-and-wave-one-systems-by-micro-ct-and-confocal-microscopy-an-in-vitro-study
#4
Lyz Cristina Furquim Canali, Jussaro Alves Duque, Rodrigo Ricci Vivan, Clovis Monteiro Bramante, Marcus Vinícius Reis Só, Marco Antonio Hungaro Duarte
INTRODUCTION: To compare, by Micro-CT and confocal laser scanning microscopy (CLSM), the ability of the Wave One Gold and Wave One systems to remove filling material from mesial canals of mandibular molars, effective time spent; quantity of extruded material, and percentage of sealer in the dentinal tubules after retreatment and re-obturation procedures. MATERIALS AND METHODS: Ten first mandibular molars (n = 20 mesial canals) were prepared and filled with gutta-percha and Endofill sealer mixed with Rhodamine B dye using the single cone technique...
April 19, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29559692/plasmon-induced-modification-of-silicon-nanocrystals-photoluminescence-in-presence-of-gold-nanostripes
#5
S A Dyakov, D M Zhigunov, A Marinins, O A Shalygina, P P Vabishchevich, M R Shcherbakov, D E Presnov, A A Fedyanin, P K Kashkarov, S Popov, N A Gippius, S G Tikhodeev
We report on the results of theoretical and experimental studies of photoluminescense of silicon nanocrystals in the proximity to plasmonic modes of different types. In the studied samples, the type of plasmonic mode is determined by the filling ratio of a one-dimensional array of gold stripes which covers the thin film with silicon nanocrystals on a quartz substrate. We analyze the extinction, photoluminesce spectra and decay kinetics of silicon nanocrystals and show that the incident and emitted light is coupled to the corresponding plasmonic mode...
March 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29503081/comparison-between-duplex-ultrasound-and-multigate-quality-doppler-profile-software-in-the-assessment-of-lower-limb-perforating-vein-direction
#6
Sergio Gianesini, Erica Menegatti, Francesco Sisini, Savino Occhionorelli, Federico Annoni, Byung-Boong Lee, Paolo Zamboni
OBJECTIVES: The aim was to assess more accurately the net flow of the lower limb perforating veins (PVs). MATERIAL AND METHODS: This was an observational prospective study. Two hundred and twenty one limbs with chronic venous disease (C1-6EpAs,pPr) of 193 patients underwent a duplex ultrasound (DUS). All identified PVs were scanned also by means of quality Doppler profile (QDP) multigate analysis in order to determine their net inward and outward flow direction...
May 2018: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/29334277/validation-of-dpoae-screening-conducted-by-village-health-workers-in-a-rural-community-with-real-time-click-evoked-tele-auditory-brainstem-response
#7
Vidya Ramkumar, C S Vanaja, James W Hall, K Selvakumar, Roopa Nagarajan
OBJECTIVE: This study assessed the validity of DPOAE screening conducted by village health workers (VHWs) in a rural community. Real-time click evoked tele-auditory brainstem response (tele-ABR) was used as the gold standard to establish validity. DESIGN: A cross-sectional design was utilised to compare the results of screening by VHWs to those obtained via tele-ABR. Study samples: One hundred and nineteen subjects (0 to 5 years) were selected randomly from a sample of 2880 infants and young children who received DPOAE screening by VHWs...
May 2018: International Journal of Audiology
https://www.readbyqxmd.com/read/29328326/quadrupole-mode-plasmon-resonance-enabled-subwavelength-metal-dielectric-grating-optical-reflection-filters
#8
Ziyi Wang, Rongjun Zhang, Junpeng Guo
A metal-dielectric subwavelength grating structure was investigated for making single-peak narrow linewidth optical reflection filters in the near-infrared region. The subwavelength grating filter structure consists of a one-dimensional periodic array of metal (gold) and dielectric (Al2 O3 ) elements on a dielectric substrate. Optimized reflection filters have a single reflection peak with ~10 nm linewidth in the infrared region over a wide spectral band. Finite-difference time-domain (FDTD) simulations and multipole analysis show that the narrow linewidth reflection is due to the coupling of the Rayleigh anomaly wave to the quadrupole plasmon resonance mode of the subwavelength metal-dielectric grating...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29291160/a-dual-biomarker-detection-platform-for-quantitating-circulating-tumor-dna-ctdna
#9
Chunyan Cai, Zhenzhong Guo, Yiping Cao, Weiying Zhang, Yong Chen
Circulating tumor DNA (ctDNA), which includes DNA mutations, epigenetic alterations and other forms of tumor-specific abnormalities, is a promising "real-time" biomarker for noninvasive cancer assessment. Tumor DNA is of great value in the process of cancer treatment, including diagnostic and prognostic information before, during treatment and at progression. Here we introduce a peptide nucleic acids probe-gold nanoparticles (PNA-AuNPs) and lead phosphate apoferritin (LPA)-based dual biomarker detection platform, which could be used in a DNA biosensor to quantify ctDNA by detection of tumor-specific mutations and methylation of PIK3CA gene...
2018: Nanotheranostics
https://www.readbyqxmd.com/read/29258213/single-interdigital-transducer-approach-for-gravimetrical-saw-sensor-applications-in-liquid-environments
#10
Vu Hoa Nguyen, Corinna Kaulen, Ulrich Simon, Uwe Schnakenberg
Surface acoustic wave (SAW) devices are well known for mass-sensitive sensor applications. In biosensing applications, chemical and biochemically evoked binding processes on surfaces are detected in liquid environments using delay line or resonator sensor configurations, preferably in combination with the appropriate microfluidic devices. All configurations share the common feature of analyzing the transmission characteristic of the propagating SAW. In this paper, a novel SAW-based impedance sensor type is introduced which uses only one interdigital transducer (IDT), simultaneously as the SAW generator and the sensor element...
December 17, 2017: Sensors
https://www.readbyqxmd.com/read/29225361/comparison-of-shaping-ability-of-10-rotary-and-reciprocating-systems-an-in-vitro-study-with-autocad
#11
Jorge Rubio, José Ignacio Zarzosa, Antonio Pallarés
Objective: The aim of this study was to compare the cutting are, root canal anatomy preservation and non-instrumented areas of F360®, F6-SkyTaper®, Hyflex-EDM®, iRACE®, Neoniti®, O.Shape®, P.Next®, Reciproc®, Revo-S® and Wave-One-Gold® size 25 files. Materials and Methods: 300 teeth with a single straight root and a circular or elliptical root canal were divided into 10 groups (1-F360®, 2- F6-SkyTaper®, 3-Hyflex-EDM®, 4-iRACE®, 5-Neoniti®, 6-O.Shape®, 7-P...
September 2017: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/29218066/arterial-stiffness-and-hypertension-which-comes-first
#12
Monica Ecobici, Claudiu Stoicescu
Arterial hypertension is one of the traditional risk factors involved in the development of cardiovascular events, while arterial stiffness is an independent predictor of cardiovascular disease in patients with hypertension. It seems that the risk factors involved in the pathology of uncontrolled hypertension are similar to those that contribute to the development of arterial stiffness. After evidence showed that arterial stiffness is an independent prognostic factor for the occurrence of cardiovascular events in patients with arterial hypertension, the importance of assessing arterial stiffness was recognized in a document drafted by the European Society of Hypertension in 2007...
September 2017: Mædica
https://www.readbyqxmd.com/read/29180051/aptamer-based-assay-of-plated-derived-grow-factor-in-unprocessed-human-plasma-sample-and-mcf-7-breast-cancer-cell-lysates-using-gold-nanoparticle-supported-%C3%AE-cyclodextrin
#13
Mohammad Hasanzadeh, Nasrin Razmi, Ahad Mokhtarzadeh, Nasrin Shadjou, Soltanali Mahboob
Platelet-derived growth factor (PDGF), a protein biomarker, is directly involved in many cell transformation processes, such as tumor growth and progression. Elevation platelet-derived growth factor (PDGF-BB) concentration in plasma could indicate the accelerating growth of metastatic breast tumors and angiogenesis. The development of an apta-assay for detection of PDGF-BB in is presented in this work. A highly specific DNA-aptamer, selected to PDGF-BB was immobilized onto a gold nanoparticles supported α-cyclodextrin and electrochemical measurements were performed in a solution containing the phosphate buffer solution with physiological pH...
March 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29121278/frontal-alpha-delta-eeg-does-not-preclude-volitional-response-during-anaesthesia-prospective-cohort-study-of-the-isolated-forearm-technique
#14
A L Gaskell, D F Hight, J Winders, G Tran, A Defresne, V Bonhomme, A Raz, J W Sleigh, R D Sanders
Background: The isolated forearm test (IFT) is the gold standard test of connected consciousness (awareness of the environment) during anaesthesia. The frontal alpha-delta EEG pattern (seen in slow wave sleep) is widely held to indicate anaesthetic-induced unconsciousness. A priori we proposed that one responder with the frontal alpha-delta EEG pattern would falsify this concept. Methods: Frontal EEG was recorded in a subset of patients from three centres participating in an international multicentre study of IFT responsiveness following tracheal intubation...
October 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29104697/novel-surgical-approach-in-cutaneous-melanoma-patients-daring-ideas-are-like-chessmen-moved-forward-they-may-be-beaten-but-they-may-start-a-winning-game
#15
Georgi Tchernev
For the first time, but again, we propose the idea of a one-step melanoma surgery as a "golden, unified standard" that should be at least discussed and, possibly accepted shortly as the "gold standard" for the treatment of patients with skin melanomas. Critical points or comments have been made to the current melanoma's treatment approach, which has been "transcendently followed" for years and which, according to some colleagues, is not logically justified. This approach needs serious changes, the only goal of which is to achieve a better outlook for the patients...
October 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29094687/origin-of-the-heavy-elements-in-binary-neutron-star-mergers-from-a-gravitational-wave-event
#16
Daniel Kasen, Brian Metzger, Jennifer Barnes, Eliot Quataert, Enrico Ramirez-Ruiz
The cosmic origin of elements heavier than iron has long been uncertain. Theoretical modelling shows that the matter that is expelled in the violent merger of two neutron stars can assemble into heavy elements such as gold and platinum in a process known as rapid neutron capture (r-process) nucleosynthesis. The radioactive decay of isotopes of the heavy elements is predicted to power a distinctive thermal glow (a 'kilonova'). The discovery of an electromagnetic counterpart to the gravitational-wave source GW170817 represents the first opportunity to detect and scrutinize a sample of freshly synthesized r-process elements...
November 2, 2017: Nature
https://www.readbyqxmd.com/read/29047883/analysis-and-manipulation-of-the-induced-changes-in-the-state-of-polarization-by-mirror-scanners
#17
Anna Petrova-Mayor, Sarah Knudsen
The induced polarization effects of metal-coated mirrors were studied in the configurations of one- and two-mirror lidar scanners as a function of azimuth and elevation angles. The theoretical results were verified experimentally for three types of mirrors (custom enhanced gold, off-the-shelf protected gold, and protected aluminum). A method was devised and tested to maintain a desired polarization state (linear or circular) of the transmit beam for all pointing directions by means of rotating wave plates in the transmit and detection paths...
May 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28994124/disclosing-hidden-information-in-the-electroencephalogram-using-advanced-signal-analytical-techniques
#18
Annika Lüttjohann
No abstract text is available yet for this article.
December 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28845490/point-shear-wave-speed-measurement-in-differentiating-benign-and-malignant-focal-liver-lesions
#19
Yi Dong, Wen-Ping Wang, Yadan Xu, Jiaying Cao, Feng Mao, Cristoph F Dietrich
AIM: To investigate the value of ElastPQ measurement for differential diagnosis of benign and malignant focal liver lesions (FLLs) by using histologic results as a reference standard. MATERIAL AND METHODS: A total of 154 patients were included. ElastPQ measurement was performed for each lesion in which the shear wave speed (SWS) was measured. The difference in SWS and SWS ratio of FLL to surrounding liver were evaluated, and the cut off value was investigated...
June 26, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28840451/early-prediction-of-cardiac-resynchronization-therapy-response-by-non-invasive-electrocardiogram-markers
#20
Nuria Ortigosa, Víctor Pérez-Roselló, Víctor Donoso, Joaquín Osca, Luis Martínez-Dolz, Carmen Fernández, Antonio Galbis
Cardiac resynchronization therapy (CRT) is an effective treatment for those patients with severe heart failure. Regrettably, there are about one third of CRT "non-responders", i.e. patients who have undergone this form of device therapy but do not respond to it, which adversely affects the utility and cost-effectiveness of CRT. In this paper, we assess the ability of a novel surface ECG marker to predict CRT response. We performed a retrospective exploratory study of the ECG previous to CRT implantation in 43 consecutive patients with ischemic (17) or non-ischemic (26) cardiomyopathy...
August 24, 2017: Medical & Biological Engineering & Computing
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