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https://www.readbyqxmd.com/read/27910321/development-of-a-cryogenic-hydrogen-microjet-for-high-intensity-high-repetition-rate-experiments
#1
J B Kim, S Göde, S H Glenzer
The advent of high-intensity, high-repetition-rate lasers has led to the need for replenishing targets of interest for high energy density sciences. We describe the design and characterization of a cryogenic microjet source, which can deliver a continuous stream of liquid hydrogen with a diameter of a few microns. The jet has been imaged at 1 μm resolution by shadowgraphy with a short pulse laser. The pointing stability has been measured at well below a mrad, for a stable free-standing filament of solid-density hydrogen...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27906620/the-radiosensitizing-effect-of-fluorocyclopentenyl-cytosine-rx-3117-in-ovarian-and-lung-cancer-cell-lines
#2
Dzjemma Sarkisjan, Jaap van den Berg, Evelyn Smit, Young B Lee, Deog J Kim, Godefridus J Peters
RX-3117 (fluorocyclopentenyl-cytosine) is a novel cytidine analog currently being evaluated in a Phase Ib clinical trial in cancer patients with solid tumors. The radiosensitizing effect of RX-3117 was studied in A2780 ovarian cancer cells and non-small cell lung cancer cell lines and related to cell survival and the effect on cell cycle and cell cycle proteins. RX-3117 has a schedule-dependent radiosensitizing effect, but only at pre-incubation (dose modifying factors: 1.4-1.8), observed at pulse and fractionated irradiation...
December 2016: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/27906403/printable-ink-lenses-diffusers-and-2d-gratings
#3
Rajib Ahmed, Ali K Yetisen, Anthony El Khoury, Haider Butt
Advances in holography have led to applications including data storage, displays, security labels, and colorimetric sensors. However, existing top-down approaches for the fabrication of holographic devices are complex, expensive, and expertise dependent, limiting their use in practical applications. Here, ink-based holographic devices have been created for a wide range of applications in diffraction optics. A single pulse of a 3.5 ns Nd:YAG laser allowed selective ablation of ink to nanofabricate planar optical devices...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27905321/tailoring-the-morphology-and-luminescence-of-gan-ingan-core-shell-nanowires-using-bottom-up-selective-area-epitaxy
#4
Mohsen Nami, Rhett F Eller, Serdal Okur, Ashwin K Rishinaramangalam, Sheng Liu, Igal Brener, Daniel F Feezell
Controlled bottom-up selective-area epitaxy (SAE) is used to tailor the morphology and photoluminescence properties of GaN/InGaN core-shell nanowire arrays. The nanowires are grown on c-plane sapphire substrates using pulsed-mode metal organic chemical vapor deposition. By varying the dielectric mask configuration and growth conditions, we achieve GaN nanowire cores with diameters ranging from 80 to 700 nm that exhibit various degrees of polar, semipolar, and nonpolar faceting. A single InGaN quantum well (QW) and GaN barrier shell is also grown on the GaN nanowire cores and micro-photoluminescence is obtained and analyzed for a variety of nanowire dimensions, array pitch spacings, and aperture diameters...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27893539/comparative-efficacy-of-radiofrequency-and-pulsed-dye-laser-in-the-treatment-of-rosacea
#5
Sue-Jeong Kim, Young Lee, Young-Joon Seo, Jeung-Hoon Lee, Myung Im
BACKGROUND: Laser and light-based therapies have been used successfully in the treatment of rosacea; however, evidence is lacking regarding the efficacy of radiofrequency (RF). OBJECTIVE: This study evaluated the efficacy of RF in the treatment of rosacea compared with pulsed dye laser (PDL). METHODS: Thirty patients with rosacea (erythematotelangiectatic rosacea [ETR], n = 20; papulopustular rosacea [PPR], n = 10) were enrolled in a randomized, controlled, split-face study...
November 23, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27886263/nicotinic-and-opioid-receptor-regulation-of-striatal-dopamine-d2-receptor-mediated-transmission
#6
Aphroditi A Mamaligas, Yuan Cai, Christopher P Ford
In addition to dopamine neuron firing, cholinergic interneurons (ChIs) regulate dopamine release in the striatum via presynaptic nicotinic receptors (nAChRs) on dopamine axon terminals. Synchronous activity of ChIs is necessary to evoke dopamine release through this pathway. The frequency-dependence of disynaptic nicotinic modulation has led to the hypothesis that nAChRs act as a high-pass filter in the dopaminergic microcircuit. Here, we used optogenetics to selectively stimulate either ChIs or dopamine terminals directly in the striatum...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27881031/cavitation-enhances-coagulated-size-during-pulsed-high-intensity-focussed-ultrasound-ablation-in-an-isolated-liver-perfusion-system
#7
Lu-Yan Zhao, Shan Liu, Zong-Gui Chen, Jian-Zhong Zou, Feng Wu
PURPOSE: To investigate whether cavitation enhances the degree of coagulation during pulsed high-intensity focussed ultrasound (HIFU) in an isolated liver perfusion system. METHODS: Isolated liver was treated by pulsed HIFU or continuous-wave HIFU with different portal vein flow rates. The cavitation emission during exposure was recorded, and real-time ultrasound images were used to observe changes in the grey scale. The coagulation size was measured and calculated...
November 24, 2016: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/27879659/innovative-alternative-technologies-to-extract-carotenoids-from-microalgae-and-seaweeds
#8
REVIEW
Mahesha M Poojary, Francisco J Barba, Bahar Aliakbarian, Francesco Donsì, Gianpiero Pataro, Daniel A Dias, Pablo Juliano
Marine microalgae and seaweeds (microalgae) represent a sustainable source of various bioactive natural carotenoids, including β-carotene, lutein, astaxanthin, zeaxanthin, violaxanthin and fucoxanthin. Recently, the large-scale production of carotenoids from algal sources has gained significant interest with respect to commercial and industrial applications for health, nutrition, and cosmetic applications. Although conventional processing technologies, based on solvent extraction, offer a simple approach to isolating carotenoids, they suffer several, inherent limitations, including low efficiency (extraction yield), selectivity (purity), high solvent consumption, and long treatment times, which have led to advancements in the search for innovative extraction technologies...
November 22, 2016: Marine Drugs
https://www.readbyqxmd.com/read/27871315/management-of-uterine-rupture-a-case-report-and-review-of-the-literature
#9
Thomas Obinchemti Egbe, Gregory Edie Halle-Ekane, Charlotte Nguefack Tchente, Jacques Ernest Nyemb, Eugene Belley-Priso
BACKGROUND: Maternal morbidity and mortality has been a major World Health Organization concern over the years, especially in sub-Saharan Africa. This paper reports uterine rupture with severe hypovolemic shock managed at the Douala General Hospital, Cameroon. Early clinical diagnosis is paramount to maternal survival. CASE PRESENTATION: Mrs. MM aged 25 years, G3P2012, of the Bamileke tribe in Cameroon was admitted to our Department in hypovolemic shock BP = 70/40 mmHg, pulse 120 beats per minute, with altered consciousness (Glasgow Coma Scale = 13)...
November 21, 2016: BMC Research Notes
https://www.readbyqxmd.com/read/27859189/species-sorting-along-a-subsidy-gradient-alters-bacterial-community-stability
#10
Mario E Muscarella, Stuart E Jones, Jay T Lennon
The movement of resources between terrestrial and aquatic habitats has strong effects on ecological processes in recipient ecosystems. Allochthonous inputs modify the quality and quantity of the available resource pool in ways that may alter the composition and stability of recipient communities. Inputs of terrestrial dissolved organic carbon (tDOC) into aquatic ecosystems represent a large influx of resources that has the potential to affect local communities, especially microorganisms. To evaluate the effects of terrestrial inputs on aquatic bacterial community composition and stability, we manipulated the supply rate of tDOC to a set of experimental ponds...
August 2016: Ecology
https://www.readbyqxmd.com/read/27859130/stream-thermal-heterogeneity-prolongs-aquatic-terrestrial-subsidy-and-enhances-riparian-spider-growth
#11
Hiromi Uno
Emerging aquatic insects from streams are important food sources for riparian predators, yet their availability is seasonally limited. Spatial heterogeneity in stream water temperature was found to spatially desynchronize the emergence timing of aquatic insects, and prolong their flight period, potentially enhancing consumer growth. While a mayfly Ephemerella maculata emergence lasted for 12-22 d in local sites along a river, mayflies emerged 19 days earlier from warmer than cooler sites. Therefore, the overall emergence of E...
October 2016: Ecology
https://www.readbyqxmd.com/read/27857882/enhanced-electrochemical-sensing-with-carbon-nanotubes-modified-with-bismuth-and-magnetic-nanoparticles-in-a-lab-on-a-chip
#12
Preetha Jothimuthu, Joe L Hsu, Robert Chen, Mohammed Inayathullah, Venkata Raveendra Pothineni, Antony Jan, Geoffrey C Gurtner, Jayakumar Rajadas, Mark R Nicolls
Iron plays an especially important role in human physiological functions and pathological impairments. The superior properties of carbon nanotubes (CNTs) and their modification with bismuth and magnetic nanoparticles as developed in this work have led to an extraordinary and novel material to facilitate ultrasensitive detection in the nanomolar range. Here, we present the development of an electrochemical sensor for detection of ferrous (Fe(2+)) and ferric (Fe(3+)) iron by means of CNTs modified with bismuth and magnetic nanoparticles for higher sensitivity of detection...
September 2016: ChemNanoMat: Chemistry of Nanomaterials for Energy, Biology and More
https://www.readbyqxmd.com/read/27848235/lasing-with-pumping-levels-of-si-nanocrystals-on-silicon-wafer
#13
Wei-Qi Huang, Shi-Rong Liu, Zhong-Mei Huang, Xue-Ke Wu, Chao-Jian Qin, Qian-Dong Zhuang
It is reported that the silicon nanocrystals (NCs) are fabricated by using self-assembly growth method with the annealing and the electron beam irradiation processes in the pulsed laser depositing, on which the visible lasing with higher gain (over 130 cm(-1)) and the enhanced emission in optical telecommunication window are measured in photoluminescence (PL). It is interesting that the enhanced visible electroluminescence (EL) on silicon nanocrystals (Si-NCs) is obviously observed by the naked eyes, and the light-emitting diode (LED) of the Si-NCs with external quantum efficiency of 20% is made on silicon chip in our laboratory...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27828342/ultrafast-particle-plasmon-enhancement-by-energy-band-modification-in-nanostructured-tungsten-carbide
#14
Xinping Zhang, Haibin Wang, Meng Wang, Yuanhai Lin, Xiaoyan Song
Ultrafast optical excitation induced transient modification on the energy-band structures in tungsten, which resulted in the expansion and shift toward the Fermi-level of d-band. This process led to enhanced interband transitions at reduced photon energies. Meanwhile, enhanced interband excitation led to increased electron density above the Fermi level, resulting in enhanced optical scattering by localized surface plasmon resonance (LSPR). These mechanisms are responsible for balancing the direct heating of bulk electrons by optical pulses...
October 3, 2016: Optics Express
https://www.readbyqxmd.com/read/27828204/nanoimprinted-distributed-feedback-lasers-of-solution-processed-hybrid-perovskites
#15
Guy L Whitworth, Jonathan R Harwell, David N Miller, Gordon J Hedley, Wei Zhang, Henry J Snaith, Graham A Turnbull, Ifor D W Samuel
Hybrid perovskite materials have considerable potential for light emitting devices such as LEDs and lasers. We combine solution processed CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> perovskite with UV nanoimprinted polymer gratings to fabricate distributed feedback (DFB) lasers. The lead acetate deposition route is shown to be an effective method for fabricating low-loss waveguides (loss coefficient ~6 cm-1) and highly compatible with the polymer grating substrates. The nanoimprinted perovskite exhibited single-mode band-edge lasing, confirmed by angle-dependent transmission measurements...
October 17, 2016: Optics Express
https://www.readbyqxmd.com/read/27825104/human-15-lipoxygenase-1-is-a-regulator-of-dendritic-cell-spreading-and-podosome-formation
#16
Hongya Han, Xiuming Liang, Monica Ekberg, Joanna S Kritikou, Åsa Brunnström, Benjamin Pelcman, Maria Matl, Xinyan Miao, Margareta Andersson, Xiaotian Yuan, Frida Schain, Selina Parvin, Eva Melin, Jan Sjöberg, Dawei Xu, Lisa S Westerberg, Magnus Björkholm, Hans-Erik Claesson
Dendritic cells (DCs) involved in proinflammatory immune responses derive mainly from peripheral monocytes, and the cells subsequently mature and migrate into the inflammatory micromilieu. Here we report that suppressing of 15-lipoxygenase-1 led to a substantial reduction in DC spreading and podosome formation in vitro. The surface expression of CD83 was significantly lower in both sh-15-lipoxygenase-1 (15-LOX-1)-transduced cells and DCs cultivated in the presence of the inhibitor. The T-cell response against tetanus-pulsed DCs was only affected to a minor extent on inhibition of 15-LOX-1...
October 17, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27824086/capturing-structural-dynamics-in-crystalline-silicon-using-chirped-electrons-from-a-laser-wakefield-accelerator
#17
Z-H He, B Beaurepaire, J A Nees, G Gallé, S A Scott, J R Sánchez Pérez, M G Lagally, K Krushelnick, A G R Thomas, J Faure
Recent progress in laser wakefield acceleration has led to the emergence of a new generation of electron and X-ray sources that may have enormous benefits for ultrafast science. These novel sources promise to become indispensable tools for the investigation of structural dynamics on the femtosecond time scale, with spatial resolution on the atomic scale. Here, we demonstrate the use of laser-wakefield-accelerated electron bunches for time-resolved electron diffraction measurements of the structural dynamics of single-crystal silicon nano-membranes pumped by an ultrafast laser pulse...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27805405/tributyl-phosphate-aggregation-in-the-presence-of-metals-an-assessment-using-diffusion-nmr-spectroscopy
#18
Anna G Baldwin, Yuan Yang, Nicholas J Bridges, Jenifer Claire Braley
Diffusion nuclear magnetic resonance (NMR) spectroscopy was used to find the inter-aggregate interactions and sizes of tributyl phosphate (TBP) aggregates containing varying concentrations of uranium or zirconium and HNO3 in an n-dodecane diluent. The average diffusion coefficients of TBP species were measured using a pulsed-field gradient stimulated echo experiment with a longitudinal eddy-current delay (STE-LED). Inter-aggregate interactions were determined by measuring the diffusion coefficient of TBP in a sample after a series of dilutions with n-dodecane...
November 2, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27790754/advancing-rf-pulse-design-using-an-open-competition-format-report-from-the-2015-ismrm-challenge
#19
William A Grissom, Kawin Setsompop, Samuel A Hurley, Jeffrey Tsao, Julia V Velikina, Alexey A Samsonov
PURPOSE: To advance the best solutions to two important RF pulse design problems with an open head-to-head competition. METHODS: Two sub-challenges were formulated in which contestants competed to design the shortest simultaneous multislice (SMS) refocusing pulses and slice-selective parallel transmission (pTx) excitation pulses, subject to realistic hardware and safety constraints. Short refocusing pulses are needed for spin echo SMS imaging at high multiband factors, and short slice-selective pTx pulses are needed for multislice imaging in ultra-high field MRI...
October 27, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27786148/cardiopulmonary-functions-and-adenotonsillectomy-surgical-indications-need-revision
#20
M Mahajan, J S Thakur, R K Azad, N K Mohindroo, P C Negi
OBJECTIVE: To assess cardiac functions in adenotonsillar or tonsillar hypertrophy. METHODS: A prospective, interventional, academic centre based study was conducted on 25 children with adenotonsillar or tonsillar hypertrophy. All patients underwent pulsed 2-dimensional Doppler echocardiography, pulse oximetry and 12-lead electrocardiography. These assessments were repeated three months later to determine the impact of adenotonsillectomy. RESULTS: There were significant differences in mean arterial oxygen saturation, pulmonary flow acceleration time and mean pulmonary artery pressure post-operatively...
October 27, 2016: Journal of Laryngology and Otology
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