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https://www.readbyqxmd.com/read/28426144/a-multiplex-culture-system-for-the-long-term-growth-of-fission-yeast-cells
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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...
March 28, 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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/28323294/energy-harvesting-efficiency-in-gan-nanowire-based-nanogenerators-the-critical-influence-of-the-schottky-nanocontact
#12
Nicolas Jamond, Pascal Chrétien, Lina Gatilova, Elisabeth Galopin, Laurent Travers, Jean-Christophe Harmand, Frank Glas, Frédéric Houzé, Noëlle Gogneau
The performances of 1D-nanostructure based nanogenerators are governed by the ability of nanostructures to efficiently convert mechanical deformation into electrical energy, and by the efficiency with which this piezo-generated energy is harvested. In this paper, we highlight the crucial influence of the GaN nanowire-metal Schottky nanocontact on the energy harvesting efficiency. Three different metals, p-type doped diamond, PtSi and Pt/Ir, have been investigated. By using an atomic force microscope equipped with a Resiscope module, we demonstrate that the harvesting of piezo-generated energy is up to 2...
March 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28322301/flexible-wire-shaped-strain-sensor-from-cotton-thread-for-human-health-and-motion-detection
#13
Yuan-Qing Li, Pei Huang, Wei-Bin Zhu, Shao-Yun Fu, Ning Hu, Kin Liao
In this work, a wire-shaped flexible strain sensor was fabricated by encapsulating conductive carbon thread (CT) with polydimethylsiloxane (PDMS) elastomer. The key strain sensitive material, CT, was prepared by pyrolysing cotton thread in N2 atmosphere. The CT/PDMS composite wire shows a typical piezo-resistive behavior with high strain sensitivity. The gauge factors (GF) calculated at low strain of 0-4% and high strain of 8-10% are 8.7 and 18.5, respectively, which are much higher than that of the traditional metallic strain sensor (GF around 2)...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28321914/a-compact-0-5%C3%A2-t-mr-elastography-device-and-its-application-for-studying-viscoelasticity-changes-in-biological-tissues-during-progressive-formalin-fixation
#14
Jürgen Braun, Heiko Tzschätzsch, Clara Körting, Angela Ariza de Schellenberger, Marika Jenderka, Toni Drießle, Michael Ledwig, Ingolf Sack
PURPOSE: To develop a method of compact tabletop magnetic resonance elastography (MRE) for rheological tests of tissue samples and to measure changes in viscoelastic powerlaw constants of liver and brain tissue during progressive fixation. METHODS: A 10-mm bore, 0.5-T permanent-magnet-based MRI system was equipped with a gradient-amplifier-controlled piezo-actuator and motion-sensitive spin echo sequence for inducing and measuring harmonic shear vibrations in cylindrical samples...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28321656/molecular-modeling-of-the-piezoelectric-properties-of-ferroelectric-composites-containing-polyvinylidene-fluoride-pvdf-and-either-graphene-or-graphene-oxide
#15
Vladimir S Bystrov, Igor K Bdikin, Maksim Silibin, Dmitry Karpinsky, Svitlana Kopyl, Ekaterina V Paramonova, Gil Goncalves
Molecular modeling of ferroelectric composites containing polyvinylidene fluoride (PVDF) and either graphene (G) or graphene oxide (GO) were performed using the semi-empirical quantum approximation PM3 in HyperChem. The piezo properties of the composites were analyzed and compared with experimental data obtained for P(VDF-TrFE)-GO films. Qualitative agreement was obtained between the results of the modeling and the experimental results in terms of the properties of the measured effective piezoelectric coefficient d 33eff and its decrease in the presence of G/GO in comparison with the average computed piezoelectric coefficient <d 33>...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28321457/influence-of-piezotomy-and-osteoperforation-of-the-alveolar-process-on-the-rate-of-orthodontic-tooth-movement-a-systematic-review
#16
Stefan Hoffmann, Nikolaos Papadopoulos, Dominik Visel, Theresa Visel, Paul-Georg Jost-Brinkmann, Thomas Michael Präger
OBJECTIVE: The minimally invasive procedures piezosurgical corticocision and osteoperforation have been advocated as methods to accelerate orthodontic tooth movement and to shorten treatment time, but without large-scale trauma of the periosteum and the bone. The aim of this study was to evaluate if there is evidence supporting these claims based on a systematic review of the literature. MATERIALS AND METHODS: A search of PubMed and Google Scholar with the combined search terms "piezo*" and "tooth movement" was performed until May 2016...
March 20, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28306196/flexible-sensing-electronics-for-wearable-attachable-health-monitoring
#17
REVIEW
Xuewen Wang, Zheng Liu, Ting Zhang
Wearable or attachable health monitoring smart systems are considered to be the next generation of personal portable devices for remote medicine practices. Smart flexible sensing electronics are components crucial in endowing health monitoring systems with the capability of real-time tracking of physiological signals. These signals are closely associated with body conditions, such as heart rate, wrist pulse, body temperature, blood/intraocular pressure and blood/sweat bio-information. Monitoring such physiological signals provides a convenient and non-invasive way for disease diagnoses and health assessments...
March 17, 2017: Small
https://www.readbyqxmd.com/read/28278133/a-flat-panel-shaped-hybrid-piezo-triboelectric-nanogenerator-for-ambient-energy-harvesting
#18
Gul Hassan, Fasihullah Khan, Arshad Hassan, Shawkat Ali, Jinho Bae, Chong Hyun Lee
Recently, many researchers have been paying attention to nanogenerators (NGs) as energy sources for self-powered mirco-nano systems, and studying how to achieve their higher power generation. Hence, we propose a hybrid-type NG for harvesting both the piezoelectric and triboelectric effect simultaneously. In the proposed hybrid NG, the piezoelectric NG (PNG) and triboelectric NG (TENG) are fabricated using polydimethylsiloxane (PDMS) and perovskite zinc stannite (ZnSnO3) nanocubes with a high charge polarization of 59 uC cm(-2) composite (PDMS + ZnSnO3) and UV surface-treated PDMS, respectively...
April 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28268544/comparison-of-viscoelastic-property-characterization-of-plastisol-phantoms-with-magnetic-resonance-elastography-and-high-frequency-rheometry
#19
P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier
This study aims at evaluating Magnetic Resonance Elastography (MRE) as a reliable technique for the characterization of viscoelastic properties of soft tissues. Three phantoms with different concentrations of plastisol and softener were prepared in order to mechanically mimic a broad panel of healthy and pathological soft tissues. Once placed in a MRI device, each sample was excited by a homemade external driver, inducing shear waves within the medium. The storage (G') and loss (G") moduli of each phantom were then reconstructed from MRE acquisitions over a frequency range from 300 to 1,000 Hz, by applying a 2D Helmholtz inversion algorithm...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28262903/an-efficient-route-to-fabricate-fatigue-free-p-vdf-trfe-capacitors-with-enhanced-piezoelectric-and-ferroelectric-properties-and-excellent-thermal-stability-for-sensing-and-memory-applications
#20
Deepa Singh, Deepak, Ashish Garg
P(VDF-TrFE), the best known ferroelectric polymer, suffers from a rather low piezoelectric response as well as poor electrical fatigue life, hampering its application potential. Herein, we report the fabrication of fatigue free poly(vinylidenedifluoride-trifluoroethylene) P(VDF-TrFE)-based capacitors with record piezoelectric coefficients and excellent thermal stability. We proposed a cost-effective and simple solution-based process to fabricate P(VDF-TrFE)-based memory capacitors with large polarization (8...
March 6, 2017: Physical Chemistry Chemical Physics: PCCP
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