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https://www.readbyqxmd.com/read/28634463/protective-effect-of-n-acetylcysteine-amide-on-blast-induced-increase-in-intracranial-pressure-in-rats
#1
Usmah Kawoos, Richard M McCarron, Mikulas Chavko
Blast-induced traumatic brain injury is associated with acute and possibly chronic elevation of intracranial pressure (ICP). The outcome after TBI is dependent on the progression of complex processes which are mediated by oxidative stress. So far, no effective pharmacological protection against TBI exists. In this study, rats were exposed to a single or repetitive blast overpressure (BOP) at moderate intensities of 72 or 110 kPa in a compressed air-driven shock tube. The degree and duration of the increase in ICP were proportional to the intensity and frequency of the blast exposure(s)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28633832/effects-of-ultrasound-on-the-beef-structure-and-water-distribution-during-curing-through-protein-degradation-and-modification
#2
Da-Cheng Kang, Xue-Qin Gao, Qing-Feng Ge, Guang-Hong Zhou, Wan-Gang Zhang
The objective of this study was to explore the mechanisms of power ultrasound (PUS, 150 and 300W) and treatment time (30 and 120min) on the water-holding capacity (WHC) and tenderness of beef during curing. Beef muscle at 48h post mortem was subjected to PUS treatment at a frequency of 20kHz. Analysis of compression loss and shear force showed that PUS-assisted curing significantly increased the WHC and the tenderness of beef compared to static brining (p<0.05). According to the analysis of LF-NMR, PUS treatment could increase the P21 values which indicated an improvement in water-binding ability of beef muscle...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28631408/resonance-frequency-analysis-of-dental-implants-placed-at-the-posterior-maxilla-varying-the-surface-treatment-only-a-randomized-clinical-trial
#3
Marcelo M Novellino, Newton Sesma, Piero R Zanardi, Dalva C Laganá
BACKGROUND: Chemical modifications of the dental implant surface that improve the wettability result in a faster and better osseointegration. PURPOSE: The aim of this randomized clinical trial was to evaluate the implant stability quotient (ISQ) of implants with similar designs, treated with 2 surfaces, sandblasted acid-etched (SAE) and hydrophilic SAE, within the initial 16 weeks of healing. MATERIAL AND METHODS: A total of 64 implants (32 SAE-control group and 32 modified SAE-test group) with the same design, length, and diameter (conical and compressive, 4...
June 20, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28627349/-clinical-application-of-cardiopulmonary-resuscitation-with-abdominal-lifting-and-compression-in-emergency-treatment
#4
Jie Wang, Guolan Wu, Ronghua Yang, Yonghong Wang, Shunping Wang, Honglin Li, Shouhui Wang, Manguo Zhao, Xusheng Li, Yan Peng
OBJECTIVE: To investigate the clinical value of cardiopulmonary resuscitation (CPR) with abdominal lifting and compression on patients with breathing and cardiac arrest induced by severe chest trauma. METHODS: Sixty-six breathing and cardiac arrest patients induced by severe chest trauma admitted to the General Hospital of Jingyuan Coal Industry Group Company from October 2011 to October 2016 were enrolled, and they were divided into abdominal lifting and compression group (n = 32) and unarmed abdominal compression group (n = 34) by random number table...
March 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28627173/ternary-gold-hydrides-routes-to-stable-and-potentially-superconducting-compounds
#5
Martin Rahm, Roald Hoffmann, N W Ashcroft
In a search for gold hydrides, an initial discouraging result of no theoretical stability in any binary AuHn at P < 300 GPa was overcome by introducing alkali atoms as reductants. A set of AAuH2 compounds, A = Li, Na, K, Rb, and Cs, is examined; of these, certain K, Rb, and Cs compounds are predicted to be thermodynamically stable. All contain AuH2(-) molecular units and are semiconducting at P = 1 atm, and some form metallic and superconducting symmetrically bonded AuHAu sheets under compression. To induce metallicity by bringing the Au atoms closer together under ambient conditions, we examined alkaline earth ion substitution for two A, i...
June 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28625243/-experimental-study-on-effect-of-airway-pressure-on-cardiopulmonary-resuscitation
#6
Dingyu Tan, Feng Sun, Yangyang Fu, Shihuan Shao, Yazhi Zhang, Yingying Hu, Jun Xu, Huadong Zhu, Xuezhong Yu
OBJECTIVE: To observe the effect of different airway pressure on ventilation, organ perfusion and return of spontaneous circulation (ROSC) of cardiac arrest (CA) pigs during cardiopulmonary resuscitation (CPR), and to explore the possible beneficial mechanism of positive airway pressure during CPR. METHODS: Twenty healthy landrace pigs of clean grade were divided into low airway pressure group (LP group, n = 10) and high airway pressure group (HP group, n = 10) with random number table...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28623984/routine-extended-follow-up-surveillance-of-iliac-vein-stents-for-iliocaval-venous-obstruction-may-not-be-warranted
#7
Ryan Abdul-Haqq, Zdenek Novak, Benjamin J Pearce, Thomas C Matthews, Mark A Patterson, William D Jordan, Marc A Passman
OBJECTIVE: The purpose of this study was to evaluate outcomes of iliac vein stents placed for iliocaval venous obstruction (ICVO) and to determine if routine follow-up surveillance is warranted on the basis of timing of stent failure. METHODS: All patients who underwent iliac vein stenting from 2003 to 2015 were identified from a prospectively maintained registry. Demographics of the patients, venous risk factors, prior venous interventions, indications, imaging, anatomic location of the ICVO, operative findings, procedural success, complications, and clinical follow-up were recorded...
July 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28622541/transmission-characteristics-of-the-s0-and-a0-lamb-waves-at-contacting-edges-of-plates
#8
Naoki Mori, Shiro Biwa
In order to gain basic insight into the interaction between ultrasonic guided waves and structural discontinuities with contacting surfaces, the transmission characteristics of Lamb waves at contacting edges of two plates are studied experimentally. The edges of two 2.5-mm thick aluminum alloy plates are mated together to constitute a contacting interface of plates and subjected to different levels of compressive loading. The transmission measurements of the lowest-order symmetric (S0) and antisymmetric (A0) Lamb modes across the contacting interface are performed in a frequency range below the cut-off frequencies of the higher-order modes...
June 13, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28620780/a-novel-large-fragment-deletion-in-pls3-causes-rare-x-linked-early-onset-osteoporosis-and-response-to-zoledronic-acid
#9
F Lv, M Ma, W Liu, X Xu, Y Song, L Li, Y Jiang, O Wang, W Xia, X Xing, Z Qiu, M Li
We identified a novel large fragment deletion from intron 9 to 3'UTR in PLS3 (E10-E16del) in one Chinese boy with X-linked early-onset osteoporosis and vertebral fractures, which expanded the pathogenic spectrum of X-linked early-onset osteoporosis. Treatment with zoledronic acid was beneficial for increasing BMD and reshaping the vertebral bodies of this patient. INTRODUCTION: X-linked early-onset osteoporosis is a rare disease, which is characterized by low bone mineral density (BMD), vertebral compression fractures (VCFs), and/or long bone fractures...
June 16, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28620118/role-of-p38-mapk-pathway-in-the-effects-of-high-magnitude-compression-on-nucleus-pulposus-cell-senescence-in-a-disc-perfusion%C3%A2-culture
#10
Pei Li, Ruijie Zhang, Yuan Xu, Lei Song, Qiang Zhou
Nucleus pulposus (NP) cell senescence is a typical pathological feature within the degenerative intervertebral disc. As a potential inducing and aggregating factor of disc degeneration, mechanical overloading affects disc biology in multiple ways. This study was to investigate the NP cell senescence-associated phenotype under intermittent high compression in an ex vivo disc bioreactor culture, and the role of the p38-MAPK pathway in this regulatory process. Porcine discs were cultured in culture chambers of a self-developed mechanically active bioreactor and subjected to different magnitudes of dynamic compression (low-magnitude and high-magnitude: 0...
June 15, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28618790/estimation-of-surface-impedance-at-oblique-incidence-based-on-sparse-array-processing
#11
Antoine Richard, Efren Fernandez-Grande, Jonas Brunskog, Cheol-Ho Jeong
A method is proposed to estimate the surface impedance of a large absorptive panel from free-field measurements with a spherical microphone array. The method relies on the reconstruction of the pressure and the particle velocity on the studied surface using an equivalent source method based on spherical array measurements. The sound field measured by the array is mainly composed of an incident and a reflected wave, so it can be represented as a spatially sparse problem. This makes it possible to use compressive sensing in order to enhance the resolution and the quality of the estimation...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28616673/contribution-of-sellar-dura-integrity-to-symptom-manifestation-in-pituitary-adenomas-with-intratumoral-hemorrhage
#12
Yasuhiko Hayashi, Yasuo Sasagawa, Daisuke Kita, Issei Fukui, Masahiro Oishi, Osamu Tachibana, Fumiaki Ueda, Mitsutoshi Nakada
PURPOSE: Although hemorrhage within pituitary adenomas frequently exacerbates the symptoms, there are many grades of severity. Moreover, the contributing factors for symptom severity are still controversial. METHODS: This retrospective study included 82 patients who underwent transsphenoidal surgery for pituitary adenomas with intratumoral hemorrhage. The grades of preoperative symptoms were classified into group A, asymptomatic or minor symptoms; group B, moderate symptoms sufficient for complain; and group C, severe symptoms disturbing daily life...
June 14, 2017: Pituitary
https://www.readbyqxmd.com/read/28614070/ultralight-fe-c-nanocapsules-sponge-composite-with-reversibly-tunable-microwave-absorption-performances
#13
Yixing Li, Zhe Mao, Rongge Liu, Xiaoning Zhao, Yanhui Zhang, Gaowu Qin, Xuefeng Zhang
Microwave absorbers are usually designed to solve electromagnetic interferences at a specific frequency, while the requirements may be dynamic during service life. Therefore, a recoverable tuning for the microwave absorption properties in response to an external stimulus would be highly desirable. We herein present a micro/nano-scale hybrid absorber, in which the high-performance Fe@C nanocapsule absorbents are integrated with the porous melamine sponge skeleton, exhibiting multiple merits of lightweight, strong absorption and high elasticity...
June 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28611432/capacity-limit-for-faster-than-nyquist-non-orthogonal-frequency-division-multiplexing-signaling
#14
Ji Zhou, Yaojun Qiao, Zhanyu Yang, Qixiang Cheng, Qi Wang, Mengqi Guo, Xizi Tang
Faster-than-Nyquist (FTN) signal achieves higher spectral efficiency and capacity compared to Nyquist signal due to its smaller pulse interval or narrower subcarrier spacing. Shannon limit typically defines the upper-limit capacity of Nyquist signal. To the best of our knowledge, the mathematical expression for the capacity limit of FTN non-orthogonal frequency-division multiplexing (NOFDM) signal is first demonstrated in this paper. The mathematical expression shows that FTN NOFDM signal has the potential to achieve a higher capacity limit compared to Nyquist signal...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28602641/a-novel-flexible-capacitive-load-sensor-for-use-in-a-mobile-unicompartmental-knee-replacement-bearing-an-in-vitro-proof-of-concept-study
#15
M J A Mentink, B H Van Duren, D W Murray, H S Gill
Instrumented knee replacements can provide in vivo data quantifying physiological loads acting on the knee. To date instrumented mobile unicompartmental knee replacements (UKR) have not been realised. Ideally instrumentation would be embedded within the polyethylene bearing. This study investigated the feasibility of an embedded flexible capacitive load sensor. A novel flexible capacitive load sensor was developed which could be incorporated into standard manufacturing of compression moulded polyethylene bearings...
June 8, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28601721/a-universal-bias-in-adult-vowel-perception-by-ear-or-by-eye
#16
Matthew Masapollo, Linda Polka, Lucie Ménard
Speech perceivers are universally biased toward "focal" vowels (i.e., vowels whose adjacent formants are close in frequency, which concentrates acoustic energy into a narrower spectral region). This bias is demonstrated in phonetic discrimination tasks as a directional asymmetry: a change from a relatively less to a relatively more focal vowel results in significantly better performance than a change in the reverse direction. We investigated whether the critical information for this directional effect is limited to the auditory modality, or whether visible articulatory information provided by the speaker's face also plays a role...
June 8, 2017: Cognition
https://www.readbyqxmd.com/read/28598948/causes-for-pauses-during-simulated-pediatric-cardiac-arrest
#17
David Oren Kessler, Dawn Taylor Peterson, Alexis Bragg, Yiqun Lin, John Zhong, Jonathan Duff, Mark Adler, Linda Brown, Farhan Bhanji, Jennifer Davidson, David Grant, Adam Cheng
OBJECTIVES: Pauses in cardiopulmonary resuscitation negatively impact clinical outcomes; however, little is known about the contributing factors. The objective of this study is to determine the frequency, duration, and causes for pauses during cardiac arrest. DESIGN: This is a secondary analysis of video data collected from a prospective multicenter trial. Twenty-six simulated pediatric cardiac arrest scenarios each lasting 12 minutes in duration were analyzed by two independent reviewers to document events surrounding each pause in chest compressions...
June 8, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28589203/tuning-the-sound-speed-in-macroporous-polymers-with-a-hard-or-soft-matrix
#18
Artem Kovalenko, Martin Fauquignon, Thomas Brunet, Olivier Mondain-Monval
In this paper, we investigate the factors affecting the sound speed in air-filled macroporous polymer materials at ultrasound frequencies. Due to the presence of large proportion of gas, these porous materials present high compressibility and, as a consequence, low sound speed which may fall down to values as low as 40 m s(-1). Using an emulsion-templating method, we synthesize macroporous samples with similar porous structures but with three different matrices, i.e. a hard poly(styrene-divinylbenzene (DVB)) matrix, a soft epoxy-modified polydimethylsiloxane (PDMS) matrix and a very soft polyaddition PDMS matrix...
June 7, 2017: Soft Matter
https://www.readbyqxmd.com/read/28588302/spectral-comb-of-highly-chirped-pulses-generated-via-cascaded-fwm-of-two-frequency-shifted-dissipative-solitons
#19
Evgeniy V Podivilov, Denis S Kharenko, Anastasia E Bednyakova, Mikhail P Fedoruk, Sergey A Babin
Dissipative solitons generated in normal-dispersion mode-locked lasers are stable localized coherent structures with a mostly linear frequency modulation (chirp). The soliton energy in fiber lasers is limited by the Raman effect, but implementation of the intracavity feedback at the Stokes-shifted wavelength enables synchronous generation of a coherent Raman dissipative soliton. Here we demonstrate a new approach for generating chirped pulses at new wavelengths by mixing in a highly-nonlinear fiber of these two frequency-shifted dissipative solitons, as well as cascaded generation of their clones forming in the spectral domain a comb of highly chirped pulses...
June 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28580367/improving-temporal-resolution-of-ultrafast-electron-diffraction-by-eliminating-arrival-time-jitter-induced-by-radiofrequency-bunch-compression-cavities
#20
J G H Franssen, O J Luiten
The temporal resolution of sub-relativistic ultrafast electron diffraction (UED) is generally limited by the radio frequency (RF) phase and amplitude jitter of the RF lenses that are used to compress the electron pulses. We theoretically show how to circumvent this limitation by using a combination of several RF compression cavities. We show that if powered by the same RF source and with a proper choice of RF field strengths, RF phases, and distances between the cavities, the combined arrival time jitter due to RF phase jitter of the cavities is cancelled at the compression point...
July 2017: Structural Dynamics (Melville, N.Y.)
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