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https://www.readbyqxmd.com/read/28339127/quantitative-ultrasound-texture-analysis-for-differentiating-preterm-from-term-fetal-lungs
#1
Sleiman R Ghorayeb, Luis A Bracero, Matthew J Blitz, Zara Rahman, Martin L Lesser
OBJECTIVES: To differentiate preterm (<37 weeks' gestation) from term (≥37 weeks' gestation) fetal lungs by using quantitative texture analysis of ultrasound images. METHODS: This study retrospectively evaluated singleton gestations with valid dating at 20 weeks' gestational age (GA) or later between January 2015 and December 2015. Images were obtained from Voluson E8 ultrasound systems (GE Healthcare, Milwaukee, WI). A region of interest was selected in each fetal lung image at the level of the 4 heart chambers from an area that appeared most representative of the overall lung tissue and had the least shadow...
March 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28339044/suppression-of-nuclear-factor-erythroid%C3%A2-2%C3%A2-related-factor-2%C3%A2-mediated-antioxidative-defense-in-the-lung-injury-induced-by-chronic-exposure-to-methamphetamine-in-rats
#2
Yang Bai, Yun Wang, Ming Liu, Yu-Han Gu, Bin Jiang, Xu Wu, Huai-Liang Wang
The imbalance between oxidative stress and antioxidant defense is important in the pathogenesis of lung diseases. Nuclear factor erythroid‑2‑related factor 2 (Nrf2) is a key transcriptional factor that regulates the antioxidant response. The purpose of the present study was to investigate whether Nrf2‑mediated antioxidative defense is involved in methamphetamine (MA)‑induced lung injury in rats. Following establishment of chronic MA toxicity in rats, Doppler ultrasonic detection was used to measure the changes of physiological indexes, followed by hematoxylin and eosin staining, ELISA and western blot analysis...
March 22, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28338477/osmotic-and-hemodynamic-effects-of-hypertonic-glucose-during-hemodialysis
#3
Daniel Schneditz, Stanisław Niemczyk, Notburga Sauseng, Isolde Bachler, Edda Zierler, Helmut Karl Lackner, Hildegard Hafner-Giessauf
It was the purpose to quantify the hemodynamic effects of a bolus of hypertonic glucose injected into the extracorporeal system in a group of stable and non-diabetic patients during hemodialysis (HD).Glucose and electrolytes were measured in frequent intervals. Arterial blood pressures and heart rates were continuously recorded by non-invasive vascular unloading technique. Beat-to-beat stroke volume, cardiac output, and total peripheral resistance were determined by Modelflow method. Relative blood volumes were continuously measured by ultrasonic and optical means...
March 22, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28338300/%C3%A2-separated-root-canal-instruments-%C3%A2-an-overview-of-incidence-localisation-treatment-strategies-and-outcome%C3%A2
#4
Beat Suter
The dreaded fracture of a root canal instrument is in fact a rare adverse event. Most instrument fractures occur in molar teeth with the highest degree of root curvature. Various treatment options (leaving the fractured instrument with or without apicoectomy, bypassing or removing the fragment) and removing techniques (using ultrasonics, hollow tubes or bypassing and removing with debriders) are discussed. The clinical prognosis for teeth with fractured instruments is not necessarily compromised if appropriate further treatment is undertaken...
March 24, 2017: Swiss Dental Journal
https://www.readbyqxmd.com/read/28337669/sonocatalysis-a-potential-sustainable-pathway-for-the-valorization-of-lignocellulosic-biomass-and-derivatives
#5
REVIEW
Ewelina Kuna, Ronan Behling, Sabine Valange, Gregory Chatel, Juan Carlos Colmenares
Lignocellulosic biomass represents a natural renewable chemical feedstock that can be used to produce high value-added chemicals and platform molecules. Nowadays, there are extensive studies on a variety of aspects concerning the valorization of lignocellulosic biomass into desirable products. Among the current technologies for biomass conversion some require extreme conditions along with high temperatures and pressures. Therefore, major technological innovations based on more economical and environmental methodologies are currently developed both in academic laboratories and in industry...
April 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28335972/ultrasound-assisted-ionic-liquid-based-micellar-extraction-combined-with-microcrystalline-cellulose-as-sorbent-in-dispersive-microextraction-for-the-determination-of-phenolic-compounds-in-propolis
#6
Jun Cao, Li-Qing Peng, Li-Jing Du, Qi-Dong Zhang, Jing-Jing Xu
An ionic liquid-(IL) based micellar extraction combined with microcrystalline cellulose- (MCC) assisted dispersive micro solid-phase extraction method was developed to extract phenolic compounds from propolis. A total of 20 target compounds were identified by ultra-high- performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry. The main extraction parameters were optimized and included the ultrasonic power, ultrasonic time, sample pH, type of IL, the concentration of [C12mim]Br, extraction time, concentration of MCC, type of sorbent and type of elution solvents...
April 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28335331/the-use-of-spray-dried-mn%C3%A2-o%C3%A2-c-composites-as-electrocatalysts-for-li-o%C3%A2-batteries
#7
Hong-Kai Yang, Chih-Chun Chin, Jenn-Shing Chen
The electrocatalytic activities of Mn₃O₄/C composites are studied in lithium-oxygen (Li-O₂) batteries as cathode catalysts. The Mn₃O₄/C composites are fabricated using ultrasonic spray pyrolysis (USP) with organic surfactants as the carbon sources. The physical and electrochemical performance of the composites is characterized by X-ray diffraction, scanning electron microscopy, particle size analysis, Brunauer-Emmett-Teller (BET) measurements, elemental analysis, galvanostatic charge-discharge methods and rotating ring-disk electrode (RRDE) measurements...
November 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335328/investigation-of-the-mechanical-properties-and-microstructure-of-graphene-nanoplatelet-cement-composite
#8
Baomin Wang, Ruishuang Jiang, Zhenlin Wu
In this work, graphene nanoplatelets (GNPs) were dispersed uniformly in aqueous solution using methylcellulose (MC) as a dispersing agent via ultrasonic processing. Homogenous GNP suspensions were incorporated into the cement matrix to investigate the effect of GNPs on the mechanical behavior of cement paste. The optimum concentration ratio of GNPs to MC was confirmed as 1:7 by ultraviolet visible spectroscopy (UV-Vis), and the optical microscope and transmission electron microscopy (TEM) images displayed remarkable dispersing performance...
November 4, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335292/a-tunable-photoluminescent-composite-of-cellulose-nanofibrils-and-cds-quantum-dots
#9
Qinwen Wang, Aimin Tang, Yuan Liu, Zhiqiang Fang, Shiyu Fu
The preparation of fluorescent nanocomposite materials with tunable emission wavelengths by combining cellulose nanofibrils (CNFs) with inorganic nanoparticles is important for promoting CNFs applications. A CNF/CdS nanocomposite was prepared via in situ compositing at room temperature on oxidized CNFs with CdS quantum dots. By controlling the -COOH/Cd(2+) ratio on the CNF, the feeding time of Na₂S and the ultrasonic maturing time, the size of the CdS quantum dots on the CNF surface could be adjusted so that to obtain the CNF/CdS nanocomposite material with different fluorescent colors...
September 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335239/a-flexible-360-degree-thermal-sound-source-based-on-laser-induced-graphene
#10
Lu-Qi Tao, Ying Liu, Zhen-Yi Ju, He Tian, Qian-Yi Xie, Yi Yang, Tian-Ling Ren
A flexible sound source is essential in a whole flexible system. It's hard to integrate a conventional sound source based on a piezoelectric part into a whole flexible system. Moreover, the sound pressure from the back side of a sound source is usually weaker than that from the front side. With the help of direct laser writing (DLW) technology, the fabrication of a flexible 360-degree thermal sound source becomes possible. A 650-nm low-power laser was used to reduce the graphene oxide (GO). The stripped laser induced graphene thermal sound source was then attached to the surface of a cylindrical bottle so that it could emit sound in a 360-degree direction...
June 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334635/ultrasonic-subwavelength-phase-conjugated-mirror-with-a-layer-of-bubbles
#11
O Lombard, C Barrière, V Leroy
A single layer of gas bubbles in a yield-stress fluid is experimentally shown to behave as a phase-conjugated (PC) mirror with a thickness 250 times smaller than the wavelength (0.14mm-diameter bubbles for phase-conjugation at 40kHz). A high amplitude pump wave at frequency 80kHz interacts with a lower amplitude probe wave centered at 40kHz. A PC-reflection coefficient of 0.15 is obtained for a 50kPa pump. A perturbative second-order theory is shown to quantitatively describe the experimental observations.
March 15, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28332612/superhydrophobic-hbn-regulated-sponges-with-excellent-absorbency-fabricated-using-a-green-and-facile-method
#12
Ying Zhou, Yao Wang, Tengfei Liu, Gang Xu, Guangming Chen, Huayi Li, Lichun Liu, Qiqi Zhuo, Jiaoxia Zhang, Chao Yan
The world faces severe environmental, human and ecological problems when major oil spills and organic discharges are released into the environment. And so it is imperative to develop tools and high performance innovative materials that can efficiently absorb these organic discharges. Furthermore, green, facile methods to produce these advanced materials are also needed. In this paper, we demonstrate a novel porous supersponge based on melamine coated with hBN. This superhydrophobic sponge (with a contact angle >150°) exhibits excellent absorption performance for oils and organic solvents, including good selectivity, high capacity (up to 175 g·g(-1)) and extraordinary recyclability (less than 20% decline after 30 cycles of absorption/squeezing)...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332486/fabrication-of-the-flexible-highly-ordered-porous-alumina-templates-by-the-combined-nanosphere-lithography-and-anodization
#13
Michal Krupinski, Marcin Perzanowski, Alexey Maximenko, Yevhen Zabila, Marta Marszalek
In this work, we propose a new method for a large-scale production of flexible, periodic alumina arrays with well-ordered pores. We show the incorporation of pre-patterning based on a polystyrene (PS) nanosphere lithography into aluminium anodization process. We prepared ordered monolayers of PS spheres with average diameters of (510 ± 10) nm, and (430 ± 10) nm on a large area (1.5 x 1.5 cm<sup>2</sup>) of the Si substrate. Next, we deposited the 5 μm aluminium layer on arrays of PS nanospheres using the sputtering technique...
March 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28332173/combined-ultrasound-with-fenton-treatment-for-the-degradation-of-carcinogenic-polycyclic-aromatic-hydrocarbons-in-textile-dying-sludge
#14
Jian-Hao Zhang, Hai-Yuan Zou, Xun-An Ning, Mei-Qing Lin, Chang-Min Chen, Tai-Cheng An, Jian Sun
To develop an effective method to remove the toxic and carcinogenic polycyclic aromatic hydrocarbons (CPAHs) from textile dyeing sludge, five CPAHs were selected to investigate the degradation efficiencies using ultrasound combined with Fenton process (US/Fenton). The results showed that the synergistic effect of the US/Fenton process on the degradation of CPAHs in textile dyeing sludge was significant with the synergy degree of 30.4. During the US/Fenton process, low ultrasonic density showed significant advantage in degrading the CPAHs in textile dyeing sludge...
March 22, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28328511/wireless-power-transfer-strategies-for-implantable-bioelectronics-methodological-review
#15
Kush Agarwal, Rangarajan Jegadeesan, Yong-Xin Guo, Nitish V Thakor
Neural implants have emerged over the last decade as highly effective solutions for the treatment of dysfunctions and disorders of the nervous system. These implants establish a direct, often bidirectional, interface to the nervous system, both sensing neural signals and providing therapeutic treatments. As a result of the technological progress and successful clinical demonstrations, completely implantable solutions have become a reality and are now commercially available for the treatment of various functional disorders...
March 16, 2017: IEEE Reviews in Biomedical Engineering
https://www.readbyqxmd.com/read/28327889/hemodynamic-changes-after-unilateral-revascularization-for-moyamoya-disease-serial-assessment-by-quantitative-magnetic-resonance-angiography
#16
Tackeun Kim, Jae Seung Bang, O-Ki Kwon, Gyojun Hwang, Jeong Eun Kim, Hyun-Seung Kang, Won-Sang Cho, Cheolkyu Jung, Chang Wan Oh
BACKGROUND: Ultrasonic flow meters and quantitative magnetic resonance angiography quantitatively assess flow during hemodynamic evaluation of cerebral ischemia. Although their reliability and reproducibility have been verified, their clinical impact in moyamoya disease has rarely been reported. OBJECTIVE: To investigate flow measurement outcomes in moyamoya disease patients pre- and postoperatively through a retrospective observational study. METHODS: We evaluated 41 patients undergoing their first revascularization surgery who were followed ≥6 mo...
January 2, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28327777/predicting-and-assessing-rupture-in-protein-gels-under-oscillatory-shear
#17
Brice Saint-Michel, Thomas Gibaud, Sébastien Manneville
Soft materials may break irreversibly upon applying sufficiently large shear oscillations, a process whose physical mechanism remains largely elusive. In this work, the rupture of protein gels made of sodium caseinate under an oscillatory stress is shown to occur in an abrupt, brittle-like manner. Upon increasing the stress amplitude, the build-up of harmonic modes in the strain response can be rescaled for all gel concentrations. This rescaling yields an empirical criterion to predict the rupture point way before the samples are significantly damaged...
March 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/28327652/a-facile-ultrasonic-assisted-fabrication-of-nitrogen-doped-carbon-dots-biobr-up-conversion-nanocomposites-for-visible-light-photocatalytic-enhancements
#18
Yifan Zhang, Mira Park, Hak Yong Kim, Bin Ding, Soo-Jin Park
A highly efficient novel photocatalyst consisting of nitrogen-carbon dots (N-CDs) and three-dimensional (3D) hierarchical BiOBr was synthesized via a simple ultrasonic-assisted method and used for the degradation of hazardous dyes. Deposition of N-CDs onto the surface of BiOBr was confirmed through structure and composition characterizations. The N-CDs/BiOBr composites exhibited superior activity for organic contaminant degradation under visible light and the 1 wt% N-CDs/BiOBr composite showed the highest degradation rate, indicating that N-CDs/BiOBr composites have great potential for application in mitigating hazardous contaminants...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327108/impact-of-the-ultrasonic-scalpel-on-the-amount-of-drained-lymph-after-axillary-or-inguinal-lymphadenectomy
#19
Olivier Gié, Marie-Laure Matthey-Gié, Pedro-Manuel Marques-Vidal, Nicolas Demartines, Maurice Matter
BACKGROUND: Seroma formation and lymphoedema are frequently encountered complications after radical lymph node dissection (RLND). Attempts to reduce the lymphatic morbidity include the use of Ultrasonic Scalpel. The aim of the present analysis was to assess the impact of the ultrasonic scalpel on the amount of drained lymph after lymph node dissection. METHODS: Patients listed for a RLND or completion lymph node dissection (CLND) were enrolled in a prospective randomized trial to compare the impact of two surgical dissection techniques (USS versus control) on the amount of drained lymph...
March 21, 2017: BMC Surgery
https://www.readbyqxmd.com/read/28324933/an-ultrasonically-powered-implantable-device-for-targeted-drug-delivery
#20
Jayant Charthad, Spyridon Baltsavias, Devleena Samanta, Ting Chia Chang, Marcus J Weber, Niloufar Hosseini-Nassab, Richard N Zare, Amin Arbabian
A wirelessly powered implantable device is proposed for fully programmable and localized drug delivery. The implant is powered using an external ultrasonic transmitter and operates at <; 5% of the FDA diagnostic ultrasound intensity limit. Drug release is achieved through electrical stimulation of drug-loaded polypyrrole nanoparticles. A design methodology for the implant electronics is presented and experimentally demonstrated to be accurate in predicting the concentration of the released drug. To the best of our knowledge, this is the first ultrasonically powered implantable device platform for targeted drug delivery using electroresponsive polymers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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