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https://www.readbyqxmd.com/read/28748244/a-high-performance-and-low-cost-hole-transporting-layer-for-efficient-and-stable-perovskite-solar-cells
#1
Md Arafat Mahmud, Naveen Kumar Elumalai, Mushfika Baishakhi Upama, Dian Wang, Vinicius R Gonçales, Matthew Wright, Cheng Xu, Faiazul Haque, Ashraf Uddin
Here we report a small molecule oxidant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane (F4TCNQ) doped, low cost 2',7'-bis(bis(4-methoxyphenyl)amino)spiro[cyclopenta[2,1-b:3,4-b']dithiophene-4,9'-fluorene] (FDT) hole transporting layer (HTL) for efficient mixed organic cation based MA0.6FA0.4PbI3 (MA = methyl ammonium, FA = formamidinium) perovskite solar cells (PSCs), fabricated via a highly reproducible controlled nucleation assisted restricted volume solvent annealing method, having full temperature compatibility with flexible substrates...
July 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28741577/comparison-of-new-generation-renal-artery-denervation-systems-assessing-lesion-size-and-thermodynamics-using-a-thermochromic-liquid-crystal-phantom-model
#2
Sara I Al Raisi, Michael T Barry, Pierre Qian, Abhishek Bhaskaran, Jim Pouliopoulos, Pramesh Kovoor
AIM: To evaluate and compare lesion dimensions and thermodynamics of the new generation multi-electrode Symplicity Spyral and the new generation multi-electrode EnligHTN renal artery denervation systems, using a thermochromic liquid crystal phantom model. METHODS AND RESULTS: A previously described renal artery phantom model was used as a platform for radiofrequency ablation. A total of 32 radiofrequency ablations were performed using multi-electrode Symplicity Spyral (n=16) and new generation EnligHTN systems (n=16)...
July 25, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28738007/comparison-of-intraosseous-pentobarbital-administration-and-thoracic-compression-for-euthanasia-of-anesthetized-sparrows-passer-domesticus-and-starlings-sturnus-vulgaris
#3
Joanne R Paul-Murphy, Andrew Engilis, Peter J Pascoe, D Colette Williams, Kate A Gustavsen, Tracy L Drazenovich, M Kevin Keel, Tamsen M Polley, Irene E Engilis
OBJECTIVE To compare intraosseous pentobarbital treatment (IPT) and thoracic compression (TC) on time to circulatory arrest and an isoelectric electroencephalogram (EEG) in anesthetized passerine birds. ANIMALS 30 wild-caught adult birds (17 house sparrows [Passer domesticus] and 13 European starlings [Sturnus vulgaris]). PROCEDURES Birds were assigned to receive IPT or TC (n = 6/species/group). Birds were anesthetized, and carotid arterial pulses were monitored by Doppler methodology. Five subdermal braided-wire electrodes were used for EEG...
August 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28734866/label-free-profiling-of-cell-dynamics-a-sequence-of-impedance-based-assays-to-estimate-tumor-cell-invasiveness-in-vitro
#4
Orsolya Láng, L Ai, Joachim Wegener
Dynamic properties of cancer cells, most notably their ability to migrate, have been correlated successfully with their invasive nature in vivo. To establish a stronger experimental basis for such a correlation we subjected five different cancer cell lines of well-defined metastatic potential to a sequence of three independent assays reporting on three different aspects of cell dynamics, namely (1) the kinetics of cell spreading, (2) cell shape fluctuations, and (3) cell migration. The sequentially applied assays correspond to different measuring modes of the well-established ECIS technique that is based on non-invasive and label-free impedance readings of planar gold-film electrodes that serve as the growth substrate for the cells under study...
July 19, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28730817/efficient-solid-state-electrochemiluminescence-from-high-quality-perovskite-quantum-dot-films
#5
Jingjing Xue, Ziyi Zhang, Fenfen Zheng, Qin Xu, Jinchun Xu, Guizheng Zou, Lingling Li, Jun-Jie Zhu
Halide perovskite materials have emerged as a new class of revolutionary photovoltaic and optoelectronic nanomaterials. However, the study on electrochemiluminescence (ECL) from halide perovskite nanomaterials is still in its infancy due to their instability, sensitivity, and difficulties in purification and film formation. Here, we propose a scraping coating method for the fabrication of high-quality halide perovskite quantum dot (QD) film on electrode, which shows dense and uniform packing with minimum grain size...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28725924/effect-of-training-status-on-beta-range-corticomuscular-coherence-in-agonist-vs-antagonist-muscles-during-isometric-knee-contractions
#6
Fabien Dal Maso, Marieke Longcamp, Sylvain Cremoux, David Amarantini
Antagonist muscle co-activation is thought to be partially regulated by cortical influences, but direct motor cortex involvement is not fully understood. Corticomuscular coherence (CMC) measures direct functional coupling of the motor cortex and muscles. As antagonist co-activation differs according to training status, comparison of CMC in agonist and antagonist muscles and in strength-trained and endurance-trained individuals may provide in-depth knowledge of cortical implication in antagonist muscle co-activation...
July 19, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28725554/successful-surgical-management-of-new-onset-refractory-status-epilepticus-norse-presenting-with-gelastic-seizures-in-a-3%C3%A2-year-old-girl
#7
Ahmad Marashly, Sean Lew, Jennifer Koop
Gelastic seizures (GS) are typically associated with hypothalamic hamartomas and present during childhood. However it is now known that GS can be found in focal epilepsies arising from other regions in the brain, including mesial and neocortical frontal, temporal and parietal regions. GS have rarely been described as the presenting manifestation of New Onset Refractory Status Epilepticus (NORSE). In this article we describe a previously healthy 3-year-old who presented with an explosive onset of GS that were refractory to multiple anti-seizure medications...
2017: Epilepsy & Behavior Case Reports
https://www.readbyqxmd.com/read/28718878/deep-brain-and-cortical-stimulation-for-epilepsy
#8
REVIEW
Mathieu Sprengers, Kristl Vonck, Evelien Carrette, Anthony G Marson, Paul Boon
BACKGROUND: Despite optimal medical treatment, including epilepsy surgery, many epilepsy patients have uncontrolled seizures. Since the 1970s interest has grown in invasive intracranial neurostimulation as a treatment for these patients. Intracranial stimulation includes both deep brain stimulation (DBS) (stimulation through depth electrodes) and cortical stimulation (subdural electrodes). This is an updated version of a previous Cochrane review published in 2014. OBJECTIVES: To assess the efficacy, safety and tolerability of DBS and cortical stimulation for refractory epilepsy based on randomized controlled trials (RCTs)...
July 18, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28710356/determination-of-individual-contact-interfaces-in-carbon-nanotube-network-based-transistors
#9
Jinsu Yoon, Meehyun Lim, Bongsik Choi, Dong Myong Kim, Dae Hwan Kim, Sungho Kim, Sung-Jin Choi
Carbon nanotubes (CNTs) used as semiconducting channels induce high mobility, thermal conductivity, mechanical flexibility, and chemical stability in field-effect, thin-film transistors (TFTs). However, the contact interfaces in CNT-TFTs have contact resistances that are difficult to reduce; this contact resistance can eventually limit the overall performance of CNT-TFTs. The contact interface between the source/drain electrodes and CNTs, especially for those CNT-TFTs in which the channel comprises randomly networked CNTs, plays a particularly dominant role in determining the performance and degree of variability in CNT-TFTs...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709992/time-dependent-evolution-of-seizures-in-a-model-of-mesial-temporal-lobe-epilepsy
#10
Charles Behr, Maxime Lévesque, Thomas Stroh, Massimo Avoli
Low-voltage fast (LVF) and hypersynchronous (HYP) - onset seizures occur in the EEG obtained with depth electrodes from mesial temporal lobe epilepsy (MTLE) patients and animal models. In epileptic rats analyzed up to approximately two weeks after pilocarpine-induced status epilepticus (SE), these patterns are associated with specific high-frequency oscillation (HFO) content: ripples (80-200Hz) or fast-ripples (250-500Hz) predominate in LVF or HYP seizures, respectively. To establish whether these features change over the course of the disease, we recorded the EEG from the hippocampal CA3 subfield, subiculum, entorhinal cortex and dentate gyrus in two groups of pilocarpine-treated rats: the "early stage group" (n=8) was analyzed from day 3 to 20 post-SE while the "late stage group" (n=7) was studied from day 27 to 53 post-SE...
July 12, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28700398/the-role-of-preoperative-steroids-in-atraumatic-cochlear-implantation-surgery
#11
Jonathon Lo, Luke Campbell, Phillip Sale, Scott Chambers, Amy Hampson, Hayden Eastwood, Stephen O'Leary
HYPOTHESIS: Depth of insertion is related to the extent of tissue response and low frequency hearing loss. Intravenous steroids have greatest effect in reducing postimplantation fibrosis and hearing loss in the presence of significant electrode insertion trauma, when compared with saline treatment. BACKGROUND: Experiments exploring the enhancement of cochlear implantation (CI) outcomes with glucocorticosteroids have produced mixed results, possibly due to lack of standardization of the CI model...
July 11, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28699067/intraoperative-clinical-testing-overestimates-the-therapeutic-window-of-the-permanent-dbs-electrode-in-the-subthalamic-nucleus
#12
Josefine Blume, J Schlaier, E Rothenfußer, J Anthofer, F Zeman, A Brawanski, U Bogdahn, M Lange
BACKGROUND: Intraoperative test stimulation is established to optimize target localization in STN DBS, but requires a time-consuming awake surgery in off-medication state. The aim of this study was to compare the thresholds of stimulation-induced effects of test stimulation and the permanent electrode. METHODS: Fifty-nine PD patients receiving bilateral STN DBS were clinically examined with stepwise increasing monopolar stimulation during surgery and DBS programming at matched stimulation depths...
July 12, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28688340/pesticide-tailwater-deeply-treated-by-tubular-porous-electrode-reactor-tper-purpose-for-discharging-and-cost-saving
#13
Yonghao Zhang, Kajia Wei, Anlin Xu, Weiqing Han, Xiuyun Sun, Jiansheng Li, Jinyou Shen, Lianjun Wang
Pesticide tailwater often contains residual and toxic contaminants of triazole fungicides (TFs) due to their poor biodegradability which will do great harm to local aquatic systems. For this case, a novel electrochemical reactor (TPER) equipped a tubular porous RuO2-Sb2O5-SnO2 electrode was assembled and then employed to deeply treat pesticide tailwater. Characterizations of the electrode studied by SEM, EDS and XRD analysis indicated that it owns a porous structure and a compact and crack-free surface. Influence of the porous structure on electrochemical property was examined by cyclic voltammetry and normal pulse voltammetry...
June 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28688070/long-term-performance-of-porous-platinum-coated-neural-electrodes
#14
M Leber, R Bhandari, J Mize, D J Warren, M M H Shandhi, F Solzbacher, S Negi
Over the last several years, there has been a growing interest in neural implants for the study and diagnostics of neurological disorders as well as for the symptomatic treatment of central nervous system related diseases. One of the major challenges is the trade-off between small electrode sizes for high selectivity between single neurons and large electrode-tissue interface areas for excellent stimulation and recording properties. This paper presents an approach of increasing the real surface area of the electrodes by creating a surface microstructure...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28680501/methods-of-hearing-preservation-during-cochlear-implantation
#15
REVIEW
Ahmed Khater, Mohammad Waheed El-Anwar
Introduction  Recent advances in surgical techniques and electrode design have made residual hearing preservation during cochlear implantation (CI) possible, achievable, and desirable. Objectives  The objective of this study was to review the literature regarding methods used for hearing preservation during CI surgery. Data Synthesis  We performed a search in the LILACS, MEDLINE, SciELO, PubMed databases, and Cochrane Library, using the keywords CI, hearing preservation, CI electrode design, and CI soft surgery...
July 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/28662770/monitoring-intraoperative-neuromuscular-blockade-and-blood-pressure-with-one-device-tof-cuff-a-comparative-study-with-mechanomyography-and-invasive-blood-pressure
#16
G Veiga Ruiz, J García Cayuela, J Orozco Montes, M Parreño Caparrós, B García Rojo, J L Aguayo Albasini
OBJECTIVE: The overall objective of the study is to determine the ability of TOF-Cuff device (blood-pressure modified cuff, including stimulation electrodes) to monitor with the same device the non-invasive blood pressure (NIBP) and the depth of a neuromuscular blockade (NMB) induced pharmacologically, by stimulation of the brachial plexus at the humeral level and recording evoked changes in arterial pressure. MATERIAL AND METHOD: Clinical, single-centre, open-controlled study with 32 adult patients ASA I-III for scheduled elective surgery under general anaesthesia in supine position, for the validation of neuromuscular monitoring, comparing the values obtained from neuromuscular relaxation TOF-Cuff with those obtained by mechanomyography (MMG) (control method) during the recovery phase of NMB, when a TOF ratio>0...
June 26, 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/28642341/use-of-intraoperative-local-field-potential-spectral-analysis-to-differentiate-basal-ganglia-structures-in-parkinson-s-disease-patients
#17
Rachel Kolb, Aviva Abosch, Gidon Felsen, John A Thompson
Identification of brain structures traversed during implantation of deep brain-stimulating (DBS) electrodes into the subthalamic nucleus (STN-DBS) for the treatment of Parkinson's disease (PD) frequently relies on subjective correspondence between kinesthetic response and multiunit activity. However, recent work suggests that local field potentials (LFP) could be used as a more robust signal to objectively differentiate subcortical structures. The goal of this study was to analyze the spectral properties of LFP collected during STN-DBS in order to objectively identify commonly traversed brain regions and improve our understanding of aberrant oscillations in the PD-related pathophysiological cortico-basal ganglia network...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28632390/atomistic-simulation-derived-insight-on-the-irreversible-structural-changes-of-si-electrode-during-fast-and-slow-delithiation
#18
Kwang Jin Kim, James Wortman, Sung-Yup Kim, Yue Qi
Quantifying the irreversible chemical and structural changes of Si during cycling remains challenging. In this study, a continuous reactive molecular dynamics delithiation algorithm, with well-controlled potential gradient and delithiation rate, was developed and used to investigate the "natural" delithiation responses of an aluminum-oxide coated silicon thin-film. Fast delithiation led to the formation of dense Si network near the surface and nanoporosity inside the a-LixSi, resulting in 141% volume dilation and significant amount of Li trapped inside (a-Li1...
June 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28627135/in-situ-electrochemistry-of-rechargeable-battery-materials-status-report-and-perspectives
#19
REVIEW
Yijun Yang, Xizheng Liu, Zhonghua Dai, Fangli Yuan, Yoshio Bando, Dmitri Golberg, Xi Wang
The development of rechargeable batteries with high performance is considered to be a feasible way to satisfy the increasing needs of electric vehicles and portable devices. It is of vital importance to design electrodes with high electrochemical performance and to understand the nature of the electrode/electrolyte interfaces during battery operation, which allows a direct observation of the complicated chemical and physical processes within the electrodes and electrolyte, and thus provides real-time information for further design and optimization of the battery performance...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28622664/mechanical-imaging-of-soft-tissues-with-a-highly-compliant-tactile-sensing-array
#20
Bin Li, Ye Shi, Adam K Fontecchio, Yon Visell
The mechanical imaging of lumps in tissues via surface measurements can permit the noninvasive detection of disease-related differences in body tissues. In routine clinical palpation, physicians frequently make decisions based on mechanical properties that they infer from tactile information felt via touch, but these examinations currently yield little quantitative information. This has motivated the development of electronic methods for mechanical imaging. However, conventional tactile sensors are rigid, unable to conform to curved geometries, and are not adaptable to the shape of all body parts, limiting their applicability in biomedical sensing applications...
June 13, 2017: IEEE Transactions on Bio-medical Engineering
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