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https://www.readbyqxmd.com/read/28527849/role-of-piezo-channels-in-ultrasound-stimulated-dental-stem-cells
#1
Qianhua Gao, Paul R Cooper, A Damien Walmsley, Ben A Scheven
INTRODUCTION: Piezo1 and Piezo2 are mechanosensitive membrane ion channels. We hypothesized that Piezo proteins may play a role in transducing ultrasound-associated mechanical signals and activate downstream mitogen-activated protein kinase (MAPK) signaling processes in dental cells. In this study, the expression and role of Piezo channels were investigated in dental pulp stem cells (DPSCs) and periodontal ligament stem cells (PDLSCs) after treatment with low-intensity pulsed ultrasound (LIPUS)...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28512701/estimation-of-3d-ground-reaction-force-using-nanocomposite-piezo-responsive-foam-sensors-during-walking
#2
Parker G Rosquist, Gavin Collins, A Jake Merrell, Noelle J Tuttle, James B Tracy, Evan T Bird, Matthew K Seeley, David T Fullwood, William F Christensen, Anton E Bowden
This paper describes a method for the estimation of the 3D ground reaction force (GRF) during human walking using novel nanocomposite piezo-responsive foam (NCPF) sensors. Nine subjects (5 male, 4 female) walked on a force-instrumented treadmill at 1.34 m/s for 120 s each while wearing a shoe that was instrumented with four NCPF sensors. GRF data, measured via the treadmill, and sensor data, measured via the NCPF inserts, were used in a tenfold cross validation process to calibrate a separate model for each individual...
May 16, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28489398/simultaneously-enhancing-light-emission-and-suppressing-efficiency-droop-in-gan-microwire-based-uv-led-by-the-piezo-phototronic-effect
#3
Xingfu Wang, Wenbo Peng, Ruomeng Yu, Haiyang Zou, Yejing Dai, Yunlong Zi, Changsheng Wu, Shuti Li, Zhong Lin Wang
Achievement of p-n homojuncted GaN enables the birth of III-nitride light emitters. Owing to the wurtzite-structure of GaN, piezoelectric polarization charges present at the interface can effectively control/tune the optoelectric behaviors of local charge-carriers (i.e. the piezo-phototronic effect). Here, we demonstrate the significantly enhanced light-output efficiency and suppressed efficiency droop in GaN microwire (MW)-based p-n junction UV LED by the piezo-phototronic effect. By applying a -0.12% static compressive strain perpendicular to the p-n junction interface, the relative external quantum efficiency of the LED is enhanced by over 600%...
May 10, 2017: Nano Letters
https://www.readbyqxmd.com/read/28481079/high-speed-scanning-ion-conductance-microscopy-for-quantitative-analysis-of-nanoscale-dynamics-of-microvilli
#4
Hiroki Ida, Yasufumi Takahashi, Akichika Kumatani, Hitoshi Shiku, Tomokazu Matsue
Observation of nanoscale structure dynamics on cell surfaces is essential to understanding cell functions. The hopping-mode scanning ion-conductance microscopy (SICM) has been used to visualize the topography of fragile convoluted nanoscale structures on cell surfaces under non-invasive conditions. However, conventional hopping mode SICM does not have sufficient temporal resolution to observe cell-surface dynamics in situ because of the additional time required for performing vertical probe movements of the nanopipette...
May 8, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28480645/obstructive-sleep-apnea-screening-using-a-piezo-electric-sensor
#5
Urtnasan Erdenebayar, Jong Uk Park, Pilsoo Jeong, Kyoung Joung Lee
In this study, we propose a novel method for obstructive sleep apnea (OSA) detection using a piezo-electric sensor. OSA is a relatively common sleep disorder. However, more than 80% of OSA patients remain undiagnosed. We investigated the feasibility of OSA assessment using a single-channel physiological signal to simplify the OSA screening. We detected both snoring and heartbeat information by using a piezo-electric sensor, and snoring index (SI) and features based on pulse rate variability (PRV) analysis were extracted from the filtered piezo-electric sensor signal...
June 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28475958/depth-profiling-of-aptes-self-assembled-monolayers-using-surface-enhanced-confocal-raman-microspectroscopy
#6
Yingying Sun, Masahiro Yanagisawa, Masahiro Kunimoto, Masatoshi Nakamura, Takayuki Homma
The internal structure of self-assembled monolayers (SAMs) such as 3-aminopropyltriethoxysilane (APTES) fabricated on a glass substrate is difficult to characterize and analyze at nanometer level. In this study, we employed surface-enhanced Raman spectroscopy (SERS) to study the internal molecular structure of APTES SAMs. The sample APTES SAMs were deposited with Ag nanoparticles to enhance the Raman signal and to obtain subtler structure information, which were supported by density functional theory calculations...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28456237/note-an-improved-low-frequency-correction-technique-for-piezoelectric-force-sensors-in-high-speed-nanopositioning-systems
#7
Yuen K Yong, Andrew J Fleming
Piezoelectric force and position sensors provide high sensitivity but are limited at low frequencies due to their high-pass response which complicates the direct application of integral control. To overcome this issue, an additional sensor or low-frequency correction method is typically employed. However, these approaches introduce an additional first-order response that must be higher than the high-pass response of the piezo and interface electronics. This article describes a simplified method for low-frequency correction that uses the piezoelectric sensor as an electrical component in a filter circuit...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28452224/ultrathin-multi-functional-graphene-pvdf-layers-for-multi-dimensional-touch-interactivity-for-flexible-displays
#8
Shuo Gao, Xingyi Wu, Hanbin Ma, John Robertson, Arokia Nathan
This paper presents a flexible graphene/polyvinylidene difluoride (PVDF)/graphene sandwich for three-dimensional touch interactivity. Here, x-y plane touch is sensed using graphene capacitive elements, while force sensing in the z-direction is by a piezoelectric PVDF/graphene sandwich. By employing different frequency bands for the capacitive- and force-induced electrical signals, the two stimuli are detected simultaneously, achieving three-dimensional touch sensing. Static force sensing and elimination of propagated stress are achieved by augmenting the transient piezo output with the capacitive touch, thus overcoming the intrinsic inability of the piezoelectric material in detecting non-transient force signals and avoiding force touch mis-registration by propagated stress...
April 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447779/performance-and-mechanism-of-piezo-catalytic-degradation-of-4-chlorophenol-finding-of-effective-piezo-dechlorination
#9
Shenyu Lan, Jinxi Feng, Ya Xiong, Shuanghong Tian, Shengwei Liu, Lingjun Kong
Piezo-catalysis was first used to degrade a nondye pollutant, 4-chlorophenol (4-CP). In this process, hydrothermally synthesized tetragonal BaTiO3 nano/micrometer-sized particles were used as the piezo-catalyst, and the ultrasonic irradiation with low frequency was selected as the vibration energy to cause the deformation of tetragonal BaTiO3. It was found that the piezoelectric potential from the deformation could not only successfully degrade 4-chlorophenol but also effectively dechlorinate it at the same time, and five kinds of dechlorinated intermediates, hydroquinone, benzoquinone, phenol, cyclohexanone, and cyclohexanol, were determined...
May 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28426144/a-multiplex-culture-system-for-the-long-term-growth-of-fission-yeast-cells
#10
Celine Callens, Nelson C Coelho, Aaron W Miller, Maria Rosa Domino Sananes, Maitreya J Dunham, Matthieu Denoual, Damien Coudreuse
Maintenance of long-term cultures of yeast cells is central to a broad range of investigations, from metabolic studies to laboratory evolution assays. However, repeated dilutions of batch cultures lead to variations in medium composition, with implications for cell physiology. In S. cerevisiae, powerful miniaturized chemostat setups, or ministat arrays, have been shown to allow for constant dilution of multiple independent cultures. Here we set out to adapt these arrays for continuous culture of a morphologically and physiologically distinct yeast, the fission yeast Schizosaccharomyces pombe, with the goal of maintaining constant population density over time...
April 20, 2017: Yeast
https://www.readbyqxmd.com/read/28422080/study-on-temperature-and-synthetic-compensation-of-piezo-resistive-differential-pressure-sensors-by-coupled-simulated-annealing-and-simplex-optimized-kernel-extreme-learning-machine
#11
Ji Li, Guoqing Hu, Yonghong Zhou, Chong Zou, Wei Peng, Jahangir Alam Sm
As a high performance-cost ratio solution for differential pressure measurement, piezo-resistive differential pressure sensors are widely used in engineering processes. However, their performance is severely affected by the environmental temperature and the static pressure applied to them. In order to modify the non-linear measuring characteristics of the piezo-resistive differential pressure sensor, compensation actions should synthetically consider these two aspects. Advantages such as nonlinear approximation capability, highly desirable generalization ability and computational efficiency make the kernel extreme learning machine (KELM) a practical approach for this critical task...
April 19, 2017: Sensors
https://www.readbyqxmd.com/read/28397304/enhanced-performance-of-a-self-powered-organic-inorganic-photodetector-by-pyro-phototronic-and-piezo-phototronic-effects
#12
Wenbo Peng, Xingfu Wang, Ruomeng Yu, Yejing Dai, Haiyang Zou, Aurelia C Wang, Yongning He, Zhong Lin Wang
Self-powered photodetectors (PDs) have long been realized by utilizing photovoltaic effect and their performances can be effectively enhanced by introducing the piezo-phototronic effect. Recently, a novel pyro-phototronic effect is invented as an alternative approach for performance enhancement of self-powered PDs. Here, a self-powered organic/inorganic PD is demonstrated and the influences of externally applied strain on the pyro-phototronic and the photovoltaic effects are thoroughly investigated. Under 325 nm 2...
April 11, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28376327/piezo-channels
#13
Thibaud Parpaite, Bertrand Coste
Parpaite and Coste introduce Piezo channels and their role in mechanotransduction.
April 3, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28372367/fast-piezoelectric-valve-offering-controlled-gas-injection-in-magnetically-confined-fusion-plasmas-for-diagnostic-and-fuelling-purposes
#14
M Griener, O Schmitz, K Bald, D Bösser, M Cavedon, P De Marné, T Eich, G Fuchert, A Herrmann, A Kappatou, T Lunt, V Rohde, B Schweer, M Sochor, U Stroth, A Terra, E Wolfrum
In magnetically confined fusion plasmas controlled gas injection is crucial for plasma fuelling as well as for various diagnostic applications such as active spectroscopy. We present a new, versatile system for the injection of collimated thermal gas beams into a vacuum chamber. This system consists of a gas pressure chamber, sealed by a custom made piezo valve towards a small capillary for gas injection. The setup can directly be placed inside of the vacuum chamber of fusion devices as it is small and immune against high magnetic fields...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28362480/flexible-light-emission-diode-arrays-made-of-transferred-si-microwires-zno-nanofilm-with-piezo-phototronic-effect-enhanced-lighting
#15
Xiaoyi Li, Renrong Liang, Juan Tao, Zhengchun Peng, Qiming Xu, Xun Han, Xiandi Wang, Chunfeng Wang, Jing Zhu, Caofeng Pan, Zhong Lin Wang
Due to the fragility and the poor optoelectronic performances of Si, it is challenging and exciting to fabricate the Si-based flexible light-emitting diode (LED) array devices. Here, a flexible LED array device made of Si microwires-ZnO nanofilm, with the advantages of flexibility, stability, lightweight, and energy savings, is fabricated and can be used as a strain sensor to demonstrate the two-dimensional pressure distribution. Based on piezo-phototronic effect, the intensity of the flexible LED array can be increased more than 3 times (under 60 MPa compressive strains)...
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350018/frequency-tuning-allows-flow-direction-control-in-microfluidic-networks-with-passive-features
#16
Rahil Jain, Barry Lutz
Frequency tuning has emerged as an attractive alternative to conventional pumping techniques in microfluidics. Oscillating (AC) flow driven through a passive valve can be rectified to create steady (DC) flow, and tuning the excitation frequency to the characteristic (resonance) frequency of the underlying microfluidic network allows control of flow magnitude using simple hardware, such as an on-chip piezo buzzer. In this paper, we report that frequency tuning can also be used to control the direction (forward or backward) of the rectified DC flow in a single device...
May 2, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28345508/use-of-a-novel-portable-led-based-capillary-refill-time-simulator-within-a-disaster-triage-context
#17
Todd P Chang, Genevieve Santillanes, Ilene Claudius, Phung K Pham, James Koved, John Cheyne, Marianne Gausche-Hill, Amy H Kaji, Saranya Srinivasan, J Joelle Donofrio, Cynthia Bir
Introduction A simple, portable capillary refill time (CRT) simulator is not commercially available. This device would be useful in mass-casualty simulations with multiple volunteers or mannequins depicting a variety of clinical findings and CRTs. The objective of this study was to develop and evaluate a prototype CRT simulator in a disaster simulation context. METHODS: A CRT prototype simulator was developed by embedding a pressure-sensitive piezo crystal, and a single red light-emitting diode (LED) light was embedded, within a flesh-toned resin...
March 27, 2017: Prehospital and Disaster Medicine
https://www.readbyqxmd.com/read/28344735/parental-influences-and-the-relationship-to-their-children-s-physical-activity-levels
#18
Nathan A Chiarlitti, Angela M Kolen
Engaging in a physically active lifestyle relates positively to current health and reduces chances of chronic diseases in the future. Given escalating health care costs, it is paramount to reduce illnesses associated with a lack of physical activity and thus critical to identify factors that influence physical activity - especially in children, with the opportunity for a lifetime impact. One of these influencing factors may be parents/guardians. The intent of this study was to examine the relationship between children's physical activity levels and parental factors including parental physical activity, support/encouragement, restrictiveness, and self-reported participation...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28342875/the-nociception-genes-painless-and-piezo-are-required-for-the-cellular-immune-response-of-drosophila-larvae-to-wasp-parasitization
#19
Yumiko Tokusumi, Tsuyoshi Tokusumi, Robert A Schulz
In vertebrates, interaction between the nervous system and immune system is important to protect a challenged host from stress inputs from external sources. In this study, we demonstrate that sensory neurons are involved in the cellular immune response elicited by wasp infestation of Drosophila larvae. Multidendritic class IV neurons sense contacts from external stimuli and induce avoidance behaviors for host defense. Our findings show that inactivation of these sensory neurons impairs the cellular response against wasp parasitization...
May 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28324742/epithelial-homeostasis-a-piezo-of-the-puzzle
#20
Eugenia Piddini
A recent study shows that, upon stretching or wounding, epithelia display a fast proliferative response that allows for re-establishment of optimal cell density or sealing of the wound. This increased proliferation is induced by the stretch-activated channel Piezo1 and involves calcium-triggered ERK signalling.
March 20, 2017: Current Biology: CB
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