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https://www.readbyqxmd.com/read/29651480/self-powered-photogalvanic-phosphorene-photodetectors-with-high-polarization-sensitivity-and-suppressed-dark-current
#1
Shuaishuai Li, Tao Wang, Xiaoshuang Chen, Wei Lu, Yiqun Xie, Yibin Hu
High polarization sensitivity, suppressed dark current and low energy consumption are all desirable device properties for photodetectors. In this work, we propose phosphorene-based photodetectors that are driven using photogalvanic effects (PGEs). The inversion symmetry of pristine phosphorene is broken using either application of an out-of-plane gate voltage or a heterostructure that is composed of the original phosphorene and blue phosphorene. The potential asymmetry enables PGEs under illumination by polarized light...
April 13, 2018: Nanoscale
https://www.readbyqxmd.com/read/29517224/graphene-oxide-sponge-as-nanofillers-in-printable-electrolytes-in-high-performance-quasi-solid-state-dye-sensitized-solar-cells
#2
Shanmuganathan Venkatesan, Elmer Surya Darlim, Ming-Hsiang Tsai, Hsisheng Teng, Yuh-Lang Lee
A graphene oxide sponge (GOS) is utilized the first time as a nanofiller (NF) in poly ethylene oxide (PEO) and poly vinylidene fluoride (PVDF)-based printable electrolytes (PEs) for quasi-solid state dye-sensitized solar cells (QS-DSSCs). The effects of the various concentrations of GOS NFs on the ion diffusivity and conductivity of electrolytes and the performance of the QS-DSSCs are studied. The results show that the presence of GOS NFs significantly increases the diffusivity and conductivity of the PEs. The introduction of 1...
March 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29510525/non-enzymatic-electrochemical-sensing-of-malathion-pesticide-in-tomato-and-apple-samples-based-on-gold-nanoparticles-chitosan-ionic-liquid-hybrid-nanocomposite
#3
Gulcin Bolat, Serdar Abaci
Malathion (MLT) is an organophosphorous type pesticide and having seriously high toxicity and electrochemical platforms for rapid, simple, inexpensive and sensitive determination of pesticides is still a special concern. This paper describes a simple preparation of a composite film consisting of ionic liquid (IL), chitosan (CS) and electrochemically synthesized gold nanoparticles (AuNPs) on single use pencil graphite electrodes (PGEs). The microscopic and electrochemical characterization of AuNP-CS-IL/PGE was studied using scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy...
March 4, 2018: Sensors
https://www.readbyqxmd.com/read/29346105/automated-detection-of-postictal-generalized-eeg-suppression
#4
Wanchat Theeranaew, James McDonald, Bilal Zonjy, Farhad Kaffashi, Brian D Moseley, Daniel Friedman, Elson So, James Tao, Maromi Nei, Philippe Ryvlin, Rainer Surges, Roland Thijs, Stephan Schuele, Samden Lhatoo, Kenneth A Loparo
Although there is no strict consensus, some studies have reported that Postictal generalized EEG suppression (PGES) is a potential electroencephalographic (EEG) biomarker for risk of sudden unexpected death in epilepsy (SUDEP). PGES is an epoch of EEG inactivity after a seizure, and the detection of PGES in clinical data is extremely difficult due to artifacts from breathing, movement and muscle activity that can adversely affect the quality of the recorded EEG data. Even clinical experts visually interpreting the EEG will have diverse opinions on the start and end of PGES for a given patient...
February 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29337420/a-proinflammatory-response-of-bovine-endometrial-epithelial-cells-to-active-sperm-in-vitro
#5
Ahmed E Elweza, Mohamed A Ezz, Tomas J Acosta, Anup K Talukder, Takashi Shimizu, Hiroyuki Hayakawa, Masayuki Shimada, Kazuhiko Imakawa, Ahmed H Zaghloul, Akio Miyamoto
In the cow, cryopreserved semen is inseminated into the uterus, and most of sperm are removed by backflow and phagocytes. Nevertheless, the mechanism responsible for sperm phagocytosis is unclear. Here, we used cultured bovine uterine epithelial cells (BUECs) to investigate the uterine response to sperm and the mechanism that activates polymorphonuclear neutrophils (PMNs). BUEC monolayers were co-cultured with different numbers of washed sperm obtained from cryopreserved semen (104 , 105 , and 106 sperm/ml) for 3 hr...
March 2018: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/29306761/peptide-nanoparticles-pnps-modified-disposable-platform-for-sensitive-electrochemical-cytosensing-of-dld-1-cancer-cells
#6
Yesim Tugce Yaman, Öznur Akbal, Gulcin Bolat, Betul Bozdogan, Emir Baki Denkbas, Serdar Abaci
A novel diphenylalaninamid (FFA) based peptide nanoparticles (PNPs) modified pencil graphite electrodes (PGEs) for construction of electrochemical cytosensor was demonstrated for the first time in this study. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed the spherical nanostructure of the synthesized FFA based PNPs while attenuated total reflectance-fourier transform infrared (ATR-FTIR) spectra provided information about the structure and conformation of proteins in their structure...
May 1, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29273868/involvement-of-tlr3-dependent-pges-expression-in-immunosuppression-by-human-bone-marrow-mesenchymal-stem-cells
#7
Dae Seong Kim, Whi Hyeong Lee, Myoung Woo Lee, Hyun Jin Park, In Keun Jang, Ji Won Lee, Ki Woong Sung, Hong Hoe Koo, Keon Hee Yoo
Human mesenchymal stem cells (MSCs) are known for their prostaglandin E2 (PGE2 )-mediated immunosuppressive function but the precise molecular mechanisms underlying PGE2 biosynthesis during inflammation have not been completely elucidated. In this study, we have investigated the involvement of PGE2 pathway members in PGE2 production by bone marrow (BM)-MSCs in response to inflammatory stimuli, and their role in immunosuppression mediated by BM-MSCs. We found that IFN-γ and TNF-α increased cyclooxygenase (COX)-2 expression but not that of prostaglandin E synthase (PGES), or PGE2 production...
December 22, 2017: Stem Cell Reviews
https://www.readbyqxmd.com/read/29223085/global-platinum-group-element-resources-reserves-and-mining-a-critical-assessment
#8
Gavin M Mudd, Simon M Jowitt, Timothy T Werner
The platinum group elements (PGEs) are used in many technologies and products in modern society, especially auto-catalysts, chemical process catalysts and specialty alloys, yet supply is dominated by South Africa. This leads PGEs to be assessed as 'critical metals', signalling concern about the likelihood and consequences of social, environmental and economic impacts from disruptions to supply. In order to better understand the global PGE situation, this paper presents a comprehensive global assessment of PGE reserves and resources and the key mining trends which can affect supply...
May 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29028570/bovine-ovarian-follicular-growth-and-development-correlate-with-lysophosphatidic-acid-expression
#9
Emilia Sinderewicz, Katarzyna Grycmacher, Dorota Boruszewska, Ilona Kowalczyk-Zięba, Joanna Staszkiewicz, Tomasz Ślężak, Izabela Woclawek-Potocka
The basis of successful reproduction is proper ovarian follicular growth and development. In addition to prostaglandins and vascular endothelial growth factor, a number of novel factors are suggested as important regulators of follicular growth and development: PGES, TFG, CD36, RABGAP1, DBI and BTC. This study focuses on examining the expression of these factors in granulosa and thecal cells that originate from different ovarian follicle types and their link with the expression of lysophosphatidic acid (LPA), known local regulator of reproductive functions in the cow...
September 25, 2017: Theriogenology
https://www.readbyqxmd.com/read/29027050/characterization-and-origin-of-organic-and-inorganic-pollution-in-urban-soils-in-pisa-tuscany-italy
#10
Roberto Cardelli, Giacomo Vanni, Fausto Marchini, Alessandro Saviozzi
We assessed the quality of 31 urban soils in Pisa by analyzing total petroleum hydrocarbons (TPHs), Cd, Cr, Cu, Hg, Mn, Ni, Pb, Zn, and the platinum group elements (PGEs). The risk was evaluated by the geological accumulation index (Igeo ) and the enrichment factor (EF). Results were compared with those obtained from a non-urban site and with the quantitative limits fixed by Italian legislation. In nearly all the monitored sites, the legal limit for TPH of 60 mg/kg in residential areas was exceeded, indicating widespread and intense pollution throughout the entire city area...
October 12, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28992492/tracing-platinum-accumulation-kinetics-in-oyster-crassostrea-gigas-a-sentinel-species-in-coastal-marine-environments
#11
Melina Abdou, Lionel Dutruch, Jörg Schäfer, Beñat Zaldibar, Rebeca Medrano, Urtzi Izagirre, Teba Gil-Díaz, Cécile Bossy, Charlotte Catrouillet, Ruoyu Hu, Alexandra Coynel, Antoine Lerat, Antonio Cobelo-García, Gérard Blanc, Manu Soto
Platinum Group Elements (PGEs) are extremely scarce in the Earth's Crust and of strong interest for high-end technologies due to their specific properties. They belong to the Technology Critical Elements (TCEs) for which use is forecast to increase, implying growing emissions into the environment in the following years. In particular, with the intensive use of platinum (Pt) in car catalytic converters, the anthropogenic geochemical cycle of this element has surpassed the natural cycle. Yet, environmental Pt levels are still in the sub picomolar range, making its analytical detection a challenge...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/28979673/cox-2-mediates-pm2-5-induced-apoptosis-and-inflammation-in-vascular-endothelial-cells
#12
Jie Yin, Weiwei Xia, Yuanyuan Li, Chuchu Guo, Yue Zhang, Songming Huang, Zhanjun Jia, Aihua Zhang
Emerging evidence demonstrated that particulate matter 2.5 (PM2.5) exposure served as an important risk factor of cardiovascular diseases. Some studies also reported that COX-2/mPGES-1/PGE2 cascade played a pathogenic role in vascular injury. However, the relationship between the PM2.5 exposure and the activation of COX-2/mPGES-1/PGE2 cascade in endothelial cells is still unknown. In the present study, mouse aorta endothelial cells were exposed to PM2.5. Strikingly, following the PM2.5 treatment, we observed dose- and time-dependent upregulation of COX-2 at both protein and mRNA levels as determined by Western blotting and qRT-PCR, respectively...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28854439/mpges-1-derived-pge2-contributes-to-indoxyl-sulfate-induced-mesangial-cell-proliferation
#13
Shuzhen Li, Zhenzhen Sun, Guixia Ding, Wei Gong, Jing Yu, Weiwei Xia, Songming Huang, Aihua Zhang, Yue Zhang, Zhanjun Jia
BACKGROUND/AIMS: We previously reported that indoxyl sulfate (IS) could cause mesangial cell (MC) proliferation via a cyclooxygenase (COX)-2-dependent mechanism. However, the specific prostaglandin contributing to COX-2 effect on IS-induced MC proliferation remained unknown. Thus, the present study was undertaken to examine the role of microsomal prostaglandin E synthase-1 (mPGES-1)-derived Prostaglandin E2 (PGE2) in IS-induced MC proliferation. METHODS: IS was administered to the MCs with or without mPGES-1 siRNA pretreatment to induce the MC proliferation which was determined by cell cycle analysis, DNA synthesis, and the expressions of cyclins...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28845442/etherification-of-glycerol-with-propylene-or-1-butene-for-fuel-additives
#14
Chakrapong Saengarun, Amorn Petsom, Duangamol Nuntasri Tungasmita
The etherification of glycerol with propylene over acidic heterogeneous catalysts, Amberlyst-15, S100, and S200 resins, produced mono-propyl glycerol ethers (MPGEs), 1,3-di- and 1,2-di-propyl glycerol ethers (DPGEs), and tri-propyl glycerol ether (TPGE). The propylation of glycerol over Amberlyst-15 yielded only TPGE. The glycerol etherification with 1-butene over Amberlyst-15 and S200 resins produced 1-mono-, 2-mono-, 1,2-di-, and 1,3-di-butyl glycerol ethers (1-MBGE, 2-MBGE, 1,2-DBGE, and 1,3-DBGE). The use of Amberlyst-15 resulted in the propylation and butylation of glycerol with higher yields than those obtained from the S100 and S200 resins...
2017: TheScientificWorldJournal
https://www.readbyqxmd.com/read/28820025/interaction-between-progesterone-and-interleukin-1%C3%AE-in-modulating-progesterone-receptor-expression-and-the-inflammatory-phenotype-in-human-cervical-fibroblasts
#15
Stephanie Pierce, Amy E Roberson, Kimberly Hyatt, Krista Singleton, David Deschamps, Dean A Myers
Progesterone helps maintain cervical structure during pregnancy via the progesterone receptor (PR). Two PR isoforms exist, PR-A and PR-B, which have overlapping as well as isoform-specific target genes. During late gestation, leukocytes infiltrate the cervical stroma accompanied by increased cervical cytokine levels, resembling an inflammatory process. We examined interleukin (IL)-1β regulation of the expression of PR-A, PR-B, and genes governing prostaglandin synthesis in human cervical fibroblasts (HCFs)...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28714130/nocturnal-seizures-are-associated-with-more-severe-hypoxemia-and-increased-risk-of-postictal-generalized-eeg-suppression
#16
Véronique Latreille, Myriam Abdennadher, Barbara A Dworetzky, Judith Ramel, David White, Eliot Katz, Marcin Zarowski, Sanjeev Kothare, Milena Pavlova
Patients with epilepsy have 20-fold risk of sudden death when compared to the general population. Uncontrolled seizures is the most consistent risk factor, and death often occurs at night or in relation to sleep. We examined seizure-related respiratory disturbances in sleep versus wakefulness, focusing on periictal oxygen saturation. Respiratory measures were examined in 48 recorded seizures (sleep, n = 23, wake, n = 25) from 20 adult patients with epilepsy. Seizures from sleep were associated with lower saturation, as compared to seizures from wakefulness, both during ictal (sleep median = 90...
September 2017: Epilepsia
https://www.readbyqxmd.com/read/28668370/development-of-a-conductivity-based-photothermal-absorbance-detection-microchip-using-polyelectrolytic-gel-electrodes
#17
Honggu Chun, Patty J Dennis, Erin R Ferguson Welch, Jean Pierre Alarie, James W Jorgenson, J Michael Ramsey
The development and application of polyelectrolytic gel electrodes (PGEs) for a microfluidic photothermal absorbance detection system is described. The PGEs are used to measure changes in conductivity based on heat generation by analytes absorbing light and changing the solution viscosity. The PGEs are suitable for direct contact conductivity measurements since they do not degrade with exposure to high electric fields. Both a 2-electrode system with DC voltages and a 3-electrode system with AC voltages were investigated...
November 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28600313/novel-microbial-assemblages-dominate-weathered-sulfide-bearing-rock-from-copper-nickel-deposits-in-the-duluth-complex-minnesota-usa
#18
Daniel S Jones, Kim A Lapakko, Zachary J Wenz, Michael C Olson, Elizabeth W Roepke, Michael J Sadowsky, Paige J Novak, Jake V Bailey
The Duluth Complex in northeastern Minnesota hosts economically significant deposits of copper, nickel, and platinum group elements (PGEs). The primary sulfide mineralogy of these deposits includes the minerals pyrrhotite, chalcopyrite, pentlandite, and cubanite, and weathering experiments show that most sulfide-bearing rock from the Duluth Complex generates moderately acidic leachate (pH 4 to 6). Microorganisms are important catalysts for metal sulfide oxidation and could influence the quality of water from mines in the Duluth Complex...
August 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28576433/postictal-apnea-as-an-important-mechanism-for-sudep-a-near-sudep-with-continuous-eeg-ecg-emg-recording
#19
Lang Jin, Ying Zhang, Xiao-Li Wang, Wen-Juan Zhang, Yong-Hong Liu, Zhao Jiang
Sudden unexpected death in epilepsy (SUDEP) is one of the most frequent causes of death among patients with epilepsy. Most SUDEP or near-SUDEP are unwitnessed and not observed or recorded during video-EEG recording in epilepsy monitoring units. This report describes a young woman with post ictal apnea and generalized EEG suppression (PGES) after a secondary generalized tonic-clonic seizure (sGTCS). This was accompanied by bradycardia and then ventricular tachycardia (VT). But at the end of VT, the patient's breath recovered without any intervention, such as cardio-respiratory resuscitation...
September 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28555759/postictal-generalized-eeg-suppression-and-respiratory-dysfunction-following-generalized-tonic-clonic-seizures-in-sleep-and-wakefulness
#20
Weifeng Peng, Jessica L Danison, Masud Seyal
OBJECTIVE: Sudden unexpected death in epilepsy (SUDEP) is a common cause of death in epilepsy and frequently occurs following generalized tonic-clonic seizures (GTCS) in sleep. Postictal generalized electroencephalography (EEG) suppression (PGES), postictal immobility, and periictal respiratory dysfunction are potential risk factors for SUDEP. We sought to determine whether there was a difference in respiratory dysfunction, PGES, and postictal immobility for GTCS occurring during wakefulness or sleep...
August 2017: Epilepsia
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