keyword
MENU ▼
Read by QxMD icon Read
search

Low-intensity pulsed

keyword
https://www.readbyqxmd.com/read/28097749/positive-contrast-from-cells-labeled-with-iron-oxide-nanoparticles-quantitation-of-imaging-data
#1
Sergey Magnitsky, Jinjin Zhang, Djaudat Idiyatullin, Geetha Mohan, Michael Garwood, Nancy E Lane, Sharmila Majumdar
PURPOSE: Conventional T2 -weighted MRI produces a hypointense signal from iron-labeled cells, which renders quantification unfeasible. We tested a SWeep Imaging with Fourier Transformation (SWIFT) MRI pulse sequence to generate a quantifiable hyperintense signal from iron-labeled cells. METHODS: Mesenchymal stem cells (MSCs) were labeled with different concentrations of iron oxide particles and examined for cell viability, proliferation, and differentiation. The SWIFT sequence was optimized to detect and quantify the amount of iron in the muscle tissue after injection of iron oxide solution and iron-labeled MSCs...
January 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28093955/anatomically-realistic-simulations-of-liver-ablation-by-irreversible-electroporation
#2
Radwan Qasrawi, Louis Silve, Fernando Burdío, Ziad Abdeen, Antoni Ivorra
Irreversible electroporation is a novel tissue ablation technique which entails delivering intense electrical pulses to target tissue, hence producing fatal defects in the cell membrane. The present study numerically analyzes the potential impact of liver blood vessels on ablation by irreversible electroporation because of their influence on the electric field distribution. An anatomically realistic computer model of the liver and its vasculature within an abdominal section was employed, and blood vessels down to 0...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28092533/linear-system-models-for-ultrasonic-imaging-intensity-signal-statistics
#3
Craig Abbey, Yang Zhu, Sara Bahramian, Michael Insana
Despite a great deal of work characterizing the statistical properties of radio-frequency backscattered ultrasound signals, less is known about the statistical properties of demodulated intensity signals. Analysis of intensity is made more difficult by a strong nonlinearity that arises in the process of demodulation. This limits our ability to characterize the spatial resolution and noise properties of B-mode ultrasound images. In this work, we generalize earlier results on two-point intensity covariance using a multivariate systems approach...
January 16, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28075515/the-limitations-of-pulse-oximetry-for-cchd-screening-in-the-nicu
#4
Nithi Fernandes, Satyan Lakshminrusimha
We have read this recently published manuscript by Hu et al(1) regarding using pulse oximetry for screening for critical congenital heart disease (CCHD) in the neonatal intensive care units (NICU) with great interest. As an institution exclusively serving outborn neonates, the study was appropriately designed and executed. Prior published reports of CCHD screening in the NICU report a very low detection rate with pulse oximetry screening. This article is protected by copyright. All rights reserved.
January 11, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28063227/lipus-suppressed-lps-induced-il-1%C3%AE-through-the-inhibition-of-nf-%C3%AE%C2%BAb-nuclear-translocation-via-at1-plc%C3%AE-pathway-in-mc3t3-e1
#5
Mayu Nagao, Natsuko Tanabe, Soichiro Manaka, Masako Naito, Kumiko Nakai, Tadahiro Takayama, Takayuki Kawato, Go Torigoe, Jumpei Sekino, Naoya Tsukune, Masao Maeno, Naoto Suzuki, Shuichi Sato
Inflammatory cytokines, interleukin (IL)-1, IL-6, and TNF-a, are involved in inflammatory bone diseases such as rheumatoid osteoarthritis and periodontal disease. Particularly, periodontal disease, which destroys alveolar bone, is stimulated by lipopolysaccharide (LPS). Low-intensity pulsed ultrasound (LIPUS) is used for bone healing in orthopedics and dental treatments. However,the mechanism underlying effects of LIPUS on LPS-induced inflammatory cytokine are not well understood. We therefore aimed to investigate the role of LIPUS on LPS-induced IL-1a production...
January 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28059195/generation-of-narrowband-high-intensity-carrier-envelope-phase-stable-pulses-tunable-between-4-and-18%C3%A2-%C3%A2-thz
#6
B Liu, H Bromberger, A Cartella, T Gebert, M Först, A Cavalleri
We report on the generation of high-energy (1.9 μJ) far-infrared pulses tunable between 4 and 18 THz frequency. Emphasis is placed on tunability and on minimizing the bandwidth of these pulses to less than 1 THz, as achieved by difference-frequency mixing of two linearly chirped near-infrared pulses in the organic nonlinear crystal DSTMS. As the two near-infrared pulses are derived from amplification of the same white light continuum, their carrier envelope phase fluctuations are mutually correlated, and hence the difference-frequency THz field exhibits absolute phase stability...
January 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28051149/controlled-generation-of-high-intensity-optical-rogue-waves-by-induced-modulation-instability
#7
Saili Zhao, Hua Yang, Nengsong Chen, Chujun Zhao
Optical rogue waves are featured as the generation of high amplitude events at low probability in optical systems. Moreover, the formation of optical rogue waves is unpredictable and transient in photonic crystal fibers. In this paper, we put forward a method to generate high-intensity optical rogue waves in a more controlled way based on induced modulation instability, which can suppress the noise effect and hence play a leading role in the process of pulse evolution. Our numerical simulations indicate that the generation of rogue wave can be controlled when seeding at the optimal modulation frequency and the intensity of rogue wave can be enhanced with appropriate modulation depth...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28051018/apoptosis-of-lewis-lung-carcinoma-cells-induced-by-microwave-via-p53-and-proapoptotic-proteins-in-vivo
#8
Kou-Dong Zhang, Lin-Rong Tong, Shui-Ming Wang, Rui-Yun Peng, Hai-Dong Huang, Yu-Chao Dong, Xing-Xing Zhang, Qiang Li, Chong Bai
BACKGROUND: Microwave therapy is a minimal invasive procedure and has been employed in clinical practice for the treatment of various types of cancers. However, its therapeutic application in non-small-cell lung cancer and the underlying mechanism remains to be investigated. This study aimed to investigate its effect on Lewis lung carcinoma (LLC) tumor in vivo. METHODS: Fifty LLC tumor-bearing C57BL/6 mice were adopted to assess the effect of microwave radiation on the growth and apoptosis of LLC tumor in vivo...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28034464/noninvasive-hemoglobin-monitoring-in-critically-ill-pediatric-patients-at-risk-of-bleeding
#9
P García-Soler, J M Camacho Alonso, J M González-Gómez, G Milano-Manso
OBJECTIVE: To determine the accuracy and usefulness of noninvasive continuous hemoglobin (Hb) monitoring in critically ill patients at risk of bleeding. DESIGN: An observational prospective study was made, comparing core laboratory Hb measurement (LabHb) as the gold standard versus transcutaneous hemoglobin monitoring (SpHb). SETTING: Pediatric Intensive Care Unit of a tertiary University Hospital. PATIENTS: Patients weighing >3kg at risk of bleeding...
December 26, 2016: Medicina Intensiva
https://www.readbyqxmd.com/read/28029595/pulse-duration-as-well-as-current-direction-determines-the-specificity-of-transcranial-magnetic-stimulation-of-motor-cortex-during-contraction
#10
Ricci Hannah, John C Rothwell
BACKGROUND: Previous research suggested that anterior-posterior (AP) directed currents induced by TMS in motor cortex (M1) activate interneuron circuits different from those activated by posterior-anterior currents (PA). The present experiments provide evidence that pulse duration also determines the activation of specific interneuron circuits. OBJECTIVE: To use single motor unit (SMU) recordings to confirm the difference in onset latencies of motor-evoked potentials (MEPs) evoked by different current directions and pulse durations: AP30, AP120, PA30 and PA120...
October 5, 2016: Brain Stimulation
https://www.readbyqxmd.com/read/28027610/effects-of-low-intensity-pulsed-ultrasound-on-implant-osseointegration-in-ovariectomized-rats
#11
Hongbo Zhou, Yongfu Hou, Zhimin Zhu, Weixiong Xiao, Qian Xu, Lei Li, Xin Li, Wenchuan Chen
OBJECTIVES: To investigate the effect of low-intensity pulsed ultrasound (US) on peri-implant bone healing and osseointegration under osteoporotic conditions. METHODS: Seventy-two 12-week-old female Sprague Dawley rats received bilateral ovariectomies. Twelve weeks later, titanium implants were bilaterally placed in the proximal tibial metaphysis. The right tibia was exposed to low-intensity pulsed US (40 mW/cm(2) , spatial and temporal average) for 20 min/d starting the 2nd day after implantation, and the left tibia served as a control without stimulation...
April 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28009786/low-force-muscle-activity-regulates-energy-expenditure-after-spinal-cord-injury
#12
Jessica R Woelfel, Amy L Kimball, Chu-Ling Yen, Richard K Shields
: Reduced physical activity is a primary risk factor for increased morbidity and mortality, People with spinal cord injury (SCI) have reduced activity for a lifetime, as they cannot volitionally activate affected skeletal muscles. We explored whether low force and low frequency stimulation is a viable strategy to enhance systemic energy expenditure in people with SCI. PURPOSE: To determine the effects of low stimulation frequency (1 Hz, 3 Hz) and stimulation intensity (50 mA and 100 mA) on energy expenditure in people with SCI...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28007645/parkinson-s-disease-associated-gpr37-receptor-regulates-cocaine-mediated-synaptic-depression-in-corticostriatal-synapses
#13
Daniel Rial, Xavier Morató, Joana I Real, Francisco Q Gonçalves, Igor Stagljar, Frederico C Pereira, Víctor Fernández-Dueñas, Rodrigo A Cunha, Francisco Ciruela
GPR37 is an orphan G protein-coupled receptor highly expressed in the brain. The precise function of GPR37 is still unknown, but a number of evidences indicate it modulates the dopaminergic system. Here, we aimed to determine the role of GPR37 on the control of cocaine-mediated electrophysiological effects (synaptic transmission and short-term plasticity) in corticostriatal synapses. Accordingly, we evaluated basal synaptic transmission and paired-pulse stimulation (PPS) in wild-type and GPR37KO mice slices...
December 19, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27994152/disrupting-the-blood-brain-barrier-by-focused-ultrasound-induces-sterile-inflammation
#14
Zsofia I Kovacs, Saejeong Kim, Neekita Jikaria, Farhan Qureshi, Blerta Milo, Bobbi K Lewis, Michele Bresler, Scott R Burks, Joseph A Frank
MRI-guided pulsed focused ultrasound (pFUS) combined with systemic infusion of ultrasound contrast agent microbubbles (MB) causes localized blood-brain barrier (BBB) disruption that is currently being advocated for increasing drug or gene delivery in neurological diseases. The mechanical acoustic cavitation effects of opening the BBB by low-intensity pFUS+MB, as evidenced by contrast-enhanced MRI, resulted in an immediate damage-associated molecular pattern (DAMP) response including elevations in heat-shock protein 70, IL-1, IL-18, and TNFα indicative of a sterile inflammatory response (SIR) in the parenchyma...
January 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27992070/exercise-for-haemophilia
#15
REVIEW
Karen Strike, Kathy Mulder, Rojer Michael
BACKGROUND: Haemophilia is a bleeding disorder associated with haemorrhaging into joints and muscles. Exercise is often used to aid recovery after bleeds, and to improve joint function in the presence of arthropathy. OBJECTIVES: Our objective was to systematically review the available evidence on the safety and effectiveness of exercise for people with haemophilia. SEARCH METHODS: We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group's Coagulopathies Trials Register and electronic databases PubMed, OVID-Embase, and CINAHL...
19, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27982272/cardiopulmonary-exercise-test-background-applicability-and-interpretation
#16
Artur Haddad Herdy, Luiz Eduardo Fonteles Ritt, Ricardo Stein, Claudio Gil Soares de Araújo, Mauricio Milani, Romeu Sérgio Meneghelo, Almir Sérgio Ferraz, Carlos Hossri, Antonio Eduardo Monteiro de Almeida, Miguel Morita Fernandes-Silva, Salvador Manoel Serra
Cardiopulmonary exercise test (CPET) has been gaining importance as a method of functional assessment in Brazil and worldwide. In its most frequent applications, CPET consists in applying a gradually increasing intensity exercise until exhaustion or until the appearance of limiting symptoms and/or signs. The following parameters are measured: ventilation; oxygen consumption (VO2); carbon dioxide production (VCO2); and the other variables of conventional exercise testing. In addition, in specific situations, pulse oximetry and flow-volume loops during and after exertion are measured...
November 2016: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/27980510/contrast-variation-by-dynamic-nuclear-polarization-and-time-of-flight-small-angle-neutron-scattering-i-application-to-industrial-multi-component-nanocomposites
#17
Yohei Noda, Satoshi Koizumi, Tomomi Masui, Ryo Mashita, Hiroyuki Kishimoto, Daisuke Yamaguchi, Takayuki Kumada, Shin-Ichi Takata, Kazuki Ohishi, Jun-Ichi Suzuki
Dynamic nuclear polarization (DNP) at low temperature (1.2 K) and high magnetic field (3.3 T) was applied to a contrast variation study in small-angle neutron scattering (SANS) focusing on industrial rubber materials. By varying the scattering contrast by DNP, time-of-flight SANS profiles were obtained at the pulsed neutron source of the Japan Proton Accelerator Research Complex (J-PARC). The concentration of a small organic molecule, (2,2,6,6-tetramethylpiperidine-1-yl)oxy (TEMPO), was carefully controlled by a doping method using vapour sorption into the rubber specimens...
December 1, 2016: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/27977849/conservative-interventions-for-treating-middle-third-clavicle-fractures-in-adolescents-and-adults
#18
REVIEW
Mário Lenza, Flávio Faloppa
BACKGROUND: Clavicle (collarbone) fractures account for around 4% of all fractures. Most (76%) clavicle fractures involve the middle-third section of the clavicle. Treatment of these fractures is usually non-surgical (conservative). Commonly used treatments are arm slings, strapping and figure-of-eight bandages.This is an update of a Cochrane review first published in 2009 and updated in 2014. OBJECTIVES: To evaluate the effects (benefits and harms) of different methods for conservative (non-operative) treatment for acute (treated soon after injury) middle third clavicle fractures in adolescents and adults...
15, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27965991/correlation-ion-mobility-spectrometry
#19
Austen L Davis, Wenjie Liu, William F Siems, Brian H Clowers
Using a linearly swept chirp function to modulate a Bradbury-Nielsen (BN) ion gate and application of a common signal processing technique (cross-correlation), we outline a method for obtaining high resolution IMS-MS spectra with ion gate duty cycles approaching 50%. Correlation IMS (CIMS) offers advantages over current multiplexing approaches in IMS-MS, which include the Hadamard and Fourier transforms, by minimizing transform artifacts while maintaining high ion throughput. Although cross-correlation techniques have been utilized previously in the field of IMS, to the best of our knowledge, this approach has not been utilized to obtain spectrum that resembles traditional IMS spectrum with resolving powers approaching the theoretical limit...
December 14, 2016: Analyst
https://www.readbyqxmd.com/read/27965517/laser-enhanced-high-intensity-focused-ultrasound-heating-in-an-in-vivo-small-animal-model
#20
Janggun Jo, Xinmai Yang
The enhanced heating effect during the combination of high-intensity focused ultrasound (HIFU) and low-optical-fluence laser illumination was investigated by using an in vivo murine animal model. The thighs of murine animals were synergistically irradiated by HIFU and pulsed nano-second laser light. The temperature increases in the target region were measured by a thermocouple under different HIFU pressures, which were 6.2, 7.9, and 9.8 MPa, in combination with 20 mJ/cm(2) laser exposures at 532 nm wavelength...
November 21, 2016: Applied Physics Letters
keyword
keyword
77724
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"