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https://www.readbyqxmd.com/read/28530303/a-highly-sensitive-fet-type-aptasensor-using-flower-like-mos2-nanospheres-for-real-time-detection-of-arsenic-iii
#1
Ji Hyun An, Jyongsik Jang
Arsenic (As) contamination in drinking water is problematic due to its threat to human health. Highly stable, sensitive and selective sensors are needed for As(iii), which is the most toxic of the various forms of arsenic. Herein, we describe the fabrication of field-effect transistor (FET)-type aptasensors for As(iii) detection that is based on carboxylic polypyrrole (CPPy)-coated flower-like MoS2 nanospheres (CFMNSs). Arsenic-binding aptamer-conjugated CFMNSs were integrated into a liquid-ion gated FET system, leading to extraordinary performance with a rapid response (on a time scale of less than 1 s)...
May 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28530201/ultrafast-growth-of-large-area-monolayer-mos2-film-via-gold-foil-assistant-cvd-for-high-sensitive-photodetector
#2
Changbin Nie, Leyong Yu, Xingzhan Wei, Jun Shun, Wenqiang Lu, Weimin Chen, Shuanglong Feng, Haofei Shi
Two-dimensional molybdenum disulfide (MoS2) is a promising material for ultrasensitive photodetector owing to its tunable band gap and high absorption coefficient. However, controlled synthesis of high quality, large area monolayer molybdenum disulfide (MoS2) is still a challenge in practical application. In this work, we report a gold foil assistant chemical vapor deposition (CVD) method of large size (>400 μm) single crystal MoS2 film on silicon dioxide (SiO2) substrate. The influence of Au foil in enlarging the size of single crystal MoS2 were investigated systemically using thermal simulation in Ansys workbench 16...
May 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28527625/cosmetic-micromanipulation-of-vitrified-warmed-cleavage-stage-embryos-does-not-improve-art-outcomes-an-ultrastructural-study-of-fragments
#3
Somayyeh Safari, Mohammad Ali Khalili, Zeinab Barekati, Iman Halvaei, Morteza Anvari, Stefania A Nottola
The aim was to study the ultrastructure of cytoplasmic fragments along with the effect of cosmetic micromanipulation (CM) on the morphology and development of vitrified-warmed embryos as well as assisted reproductive technology (ART) outcomes. A total of 96 frozen embryo transfer (FET) cycles were included in this prospective randomized study. They were divided into three groups of CM (n=32), sham (n=32) and control (n=32). In the CM group, the vitrified- warmed embryos were subjected to fragments and coarse granules removal (cosmetic micromanipulation) after laser assisted zona hatching (LAH); sham group subjected only to LAH and no intervention was taken for the control group...
May 17, 2017: Reproductive Biology
https://www.readbyqxmd.com/read/28525553/evaluation-of-conventional-and-frozen-elephant-trunk-techniques-on-spinal-cord-blood-flow-in-an-animal-model%C3%A2
#4
Sergey Leontyev, Maja-Theresa Dieterlen, Michelle Halling, Franziska Schlegel, Alexandro Hoyer, Susann Ossmann, Kerstin Klaeske, Christian D Etz, Friedrich W Mohr
OBJECTIVES: The treatment of patients with extensive thoracic aortic disease involving the arch and descending aorta is often performed using the frozen elephant trunk technique (FET). Spinal cord blood flow (SCBF) in cervical, thoracic and lumbar sections prior, during and after aortic arch surgery were compared in conventional elephant trunk (cET) and FET technique in a pig model. METHODS: German Landrace pigs (75-85 kg) underwent aortic arch surgery using the FET ( n  = 8) or cET ( n  = 8) techniques...
May 18, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28523169/risk-factors-for-continuous-renal-replacement-therapy-after-surgical-repair-of-type-a-aortic-dissection
#5
Hai-Bo Wu, Wei-Guo Ma, Hong-Lei Zhao, Jun Zheng, Jian-Rong Li, Ou Liu, Li-Zhong Sun
BACKGROUND: To identify the risk factors for continuous renal replacement therapy (CRRT) following surgical repair of type A aortic dissection (TAAD) using the total arch replacement and frozen elephant trunk (TAR + FET) technique. METHODS: The study included 330 patients with TAAD repaired using TAR + FET between January 2014 and April 2015. Mean age was 47.1±10.2 years (range, 18-73 years) and 242 were male (73.3%). Univariate and multivariate analyses were used to identify the risk factors for CRRT...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28516985/gate-controlled-heat-generation-in-zno-nanowire-fets
#6
Andrea Pescaglini, Subhajit Biswas, Davide Cammi, Carsten Ronning, Justin D Holmes, Daniela Iacopino
Nanoscale heating production using nanowires has been shown to be particularly attractive for a number of applications including nanostructure growth, localized doping, transparent heating and sensing. However, all proof-of-concept devices proposed so far relied on the use of highly conductive nanomaterials, typically metals or highly doped semiconductors. In this article, we demonstrate a novel nanoheater architecture based on a single semiconductor nanowire field-effect transistor (NW-FET). Nominally undoped ZnO nanowires were incorporated into three-terminal devices whereby control of the nanowire temperature at a given source-drain bias was achieved by additional charge carriers capacitatively induced via the third gate electrode...
May 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28511001/monolayer-solid-state-electrolyte-for-electric-double-layer-gating-of-graphene-field-effect-transistors
#7
Ke Xu, Hao Lu, Erich W Kinder, Alan Seabaugh, Susan K Fullerton-Shirey
The electrostatic gating of graphene field-effect transistors (FETs) is demonstrated using a two-dimensional (2D) electrolyte. The electrolyte, cobalt crown ether phthalocyanine (CoCrPc) and LiClO4, is deposited as a monolayer on the graphene channel. The crown ethers on the CoCrPc solvate lithium ions, and the ion location is modulated by a backgate without requiring liquid solvent. Ions dope the channel by inducing image charges; the doping level (i.e., induced charge density) can be modulated by the backgate bias with the extent of the surface potential change being controlled by the magnitude and polarity of the backgate bias...
May 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28509437/detection-of-avian-influenza-virus-from-cloacal-swabs-using-a-disposable-well-gate-fet-sensor
#8
Sungwook Park, Jaebin Choi, Minhong Jeun, Yongdeok Kim, Seong-Su Yuk, Sang Kyung Kim, Chang-Seon Song, Seok Lee, Kwan Hyi Lee
Current methods to detect avian influenza viruses (AIV) are time consuming and lo inw sensitivity, necessitating a faster and more sensitive sensor for on-site epidemic detection in poultry farms and urban population centers. This study reports a field effect transistor (FET) based AIV sensor that detects nucleoproteins (NP) within 30 minutes, down to an LOD of 10(3) EID50 mL(-1) from a live animal cloacal swab. Previously reported FET sensors for AIV detection have not targeted NPs, an internal protein shared across multiple strains, due to the difficulty of field-effect sensing in a highly ionic lysis buffer...
May 16, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28506949/frozen-embryo-transfer-prevents-the-detrimental-effect-of-high-estrogen-on-endometrium-receptivity
#9
Aynur Adeviye Erşahin, Mustafa Acet, Suat Süphan Erşahin, Nur Dokuzeylül Güngör
OBJECTIVE: To investigate whether serum levels of estradiol affect reproductive outcomes of normoresponder women undergoing fresh embryo transfer (ET) versus frozen-thawed ET (FET). MATERIAL AND METHODS: Two hundred fifty-five normoresponder women underwent fresh ET in their first or second in vitro fertilization cycle. Ninety-two women with negative pregnacy test results underwent FET. Clinical and ongoing pregnancy rates, implantation, and live birth rates of women undergoing fresh ET versus FET were compared...
March 15, 2017: Journal of the Turkish German Gynecological Association
https://www.readbyqxmd.com/read/28501869/intramuscular-versus-vaginal-progesterone-administration-in-medicated-frozen-embryo-transfer-cycles-a-randomized-clinical-trial-assessing-sub-endometrial-contractions
#10
Anat Hershko Klement, Nivin Samara, Amir Weintraub, Frederic Mitri, Yaakov Bentov, Paul Chang, Dan Nayot, Robert F Casper
OBJECTIVE: The study aimed to assess whether sub-endometrial contractility is reduced by the use of intramuscular (IM) progesterone. DESIGN: This is a randomized clinical trial. Patients assigned to a medicated day 5 frozen embryo transfer (FET) were randomly allocated to "vaginal progesterone" or "IM progesterone": patients randomized to the vaginal arm were treated with 200 mg micronized progesterone 3 times daily while patients randomized into the IM progesterone arm were treated with a single daily injection of 50 mg progesterone in oil...
May 13, 2017: Gynecologic and Obstetric Investigation
https://www.readbyqxmd.com/read/28501865/fresh-and-frozen-thawed-embryo-transfer-compared-to-natural-conception-differences-in-perinatal-outcome
#11
Suzanne Spijkers, Jan Willem Lens, Roel Schats, Cornelis B Lambalk
BACKGROUND/AIM: To compare the pregnancy outcome of singletons conceived after transfer of cryopreserved and thawed embryos (frozen embryo transfer [FET]) to singletons conceived after fresh embryo transfer (fresh ET) and natural conceived singletons. METHODS: Using a retrospective data analysis on a study population consisting of 1,261 singletons born after FET and 2,519 singletons born after fresh ET between 2006 and 2015. The control group consisted of singletons born after natural conception...
May 13, 2017: Gynecologic and Obstetric Investigation
https://www.readbyqxmd.com/read/28489103/triethanolamine-doped-multilayer-mos2-field-effect-transistors
#12
Min-Yeul Ryu, Ho-Kyun Jang, Kook Jin Lee, Mingxing Piao, Seung-Pil Ko, Minju Shin, Junghwan Huh, Gyu-Tae Kim
Chemical doping has been investigated as an alternative method of conventional ion implantation for two-dimensional materials. We herein report chemically doped multilayer molybdenum disulfide (MoS2) field effect transistors (FETs) through n-type channel doping, wherein triethanolamine (TEOA) is used as an n-type dopant. As a result of the TEOA doping process, the electrical performances of multilayer MoS2 FETs were enhanced at room temperature. Extracted field effect mobility was estimated to be ∼30 cm(2) V(-1) s(-1) after the surface doping process, which is 10 times higher than that of the pristine device...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28485580/solution-processed-organic-and-halide-perovskite-transistors-on-hydrophobic-surfaces
#13
Jeremy W Ward, Hannah Smith, Andrew Zeidell, Peter Diemer, Stephen Baker, Hyunsu Lee, Marcia M Payne, John E Anthony, Martin Guthold, Oana D Jurchescu
Solution-processable electronic devices are highly desirable due to their low cost and compatibility with flexible substrates. However, they are often challenging to fabricate due to the hydrophobic nature of the surfaces of the constituent layers. Here, we use a protein solution to modify the surface properties and to improve the wettability of the fluoropolymer dielectric Cytop®. The engineered hydrophilic surface is successfully incorporated in bottom-gate solution deposited organic field-effect transistors (OFETs) and organic-inorganic halide perovskite field-effect transistors (HTP-FETs) fabricated on flexible substrates...
May 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28480706/realizing-stable-p-type-transporting-in-two-dimensional-ws2-films
#14
Qian Cao, Ya-Wei Dai, Jing Xu, Lin Chen, Hao Zhu, Qing-Qing Sun, David Wei Zhang
Two-dimensional (2D) semiconductors have become promising candidates for nanoelectronics applications due to their unique layered structure and rich physical properties. However, the significant lack of reproducible p-type doping methods that can avoid the instability induced by the widely used charge transfer doping method greatly limits the applications of these semiconductors in complementary metal-oxide-semiconductor (CMOS) integrated digital circuits. This work presents a new scheme to realize stable p-type doping for WS2 with excellent layer controllability, wafer-level uniformity, and high reproducibility at the same time...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28476486/the-effect-of-endometrial-scratch-on-natural-cycle-cryopreserved-embryo-transfer-outcomes-a-randomized-controlled-study
#15
Jennifer Sze Man Mak, Cathy Hoi Sze Chung, Jacqueline Pui Wah Chung, Grace Wing Shan Kong, Sotirios H Saravelos, Lai Ping Cheung, Tin-Chiu Li
The benefit of endometrial scratch (ES) prior to embryo transfer is controversial. Systemic analysis has confirmed its potential benefit, especially in women with repeated IVF failures, yet most studies have focused on fresh embryo transfer, and its effect on vitrified-warmed embryo transfer (FET) cycles is yet to be explored. We hereby present our prospective, double-blind, randomized controlled study on the evaluation of the implantation and pregnancy rate after ES prior to natural-cycle FET. A total of 299 patients underwent natural-cycle FET and were randomized to receive ES (n = 115) or endocervical manipulation as control (n = 114) prior to FET cycle, and a total of 196 patients had embryo transfer (93 patients in each group)...
April 19, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28475166/an-all-solid-state-ph-sensor-employing-fluorine-terminated-polycrystalline-boron-doped-diamond-as-a-ph-insensitive-solution-gate-field-effect-transistor
#16
Yukihiro Shintani, Mikinori Kobayashi, Hiroshi Kawarada
A fluorine-terminated polycrystalline boron-doped diamond surface is successfully employed as a pH-insensitive SGFET (solution-gate field-effect transistor) for an all-solid-state pH sensor. The fluorinated polycrystalline boron-doped diamond (BDD) channel possesses a pH-insensitivity of less than 3mV/pH compared with a pH-sensitive oxygenated channel. With differential FET (field-effect transistor) sensing, a sensitivity of 27 mv/pH was obtained in the pH range of 2-10; therefore, it demonstrated excellent performance for an all-solid-state pH sensor with a pH-sensitive oxygen-terminated polycrystalline BDD SGFET and a platinum quasi-reference electrode, respectively...
May 5, 2017: Sensors
https://www.readbyqxmd.com/read/28472887/enabling-ambipolar-to-heavy-n-type-transport-in-pbs-quantum-dot-solids-through-doping-with-organic-molecules
#17
Mohamad Insan Nugraha, Shohei Kumagai, Shun Watanabe, Mykhailo Sytnyk, Wolfgang Heiss, Maria Antonietta Loi, Jun Takeya
PbS quantum dots are remarkable semiconducting materials, which are compatible with low cost solution processed electronic device fabrication. Understanding the chemical doping of these materials is one of great research interests, as is a necessary step to improve device performances as well as to enhance the applicability of this system for diverse optoelectronic applications. Here, we report efficient doping of PbS QD films using solution processable dopant molecules. By engineering the energy level of the dopant and the PbS QDs through the use of different crosslinking ligands, we are able to control the characteristics of PbS FETs from ambipolar to strong n-type...
May 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28472321/high-fsh-dosing-is-associated-with-reduced-live-birth-rate-in-fresh-but-not-subsequent-frozen-embryo-transfers
#18
Erika M Munch, Amy E Sparks, M Bridget Zimmerman, Bradley J Van Voorhis, Eyup Hakan Duran
STUDY QUESTION: Do live birth rates (LBRs) differ between fresh embryo transfer (fresh ET) cycles and their subsequent paired frozen ET (FET) cycles, when comparing cycles based on the total FSH dose used during the fresh cycle? SUMMARY ANSWER: When compared to the paired frozen embryo transfer cycles, the LBR in the fresh cycle of the highest total FSH dose group (>2500 IU) was reduced by 38%. WHAT IS KNOWN ALREADY: There may be a negative association with high gonadotropin doses and LBR after fresh ET...
May 3, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28467767/impact-of-endometrial-preparation-protocols-for-frozen-embryo-transfer-on-live-birth-rates
#19
Maria Cerrillo, Leyre Herrero, Alfredo Guillén, Mercedes Mayoral, Juan Antonio García-Velasco
BACKGROUND: It has been reported that a natural cycle (NC) is similar to or even better than hormone replacement therapy (HRT) in patients with regular cycles who undergo frozen embryo transfer (FET). Hundreds of FETs are managed yearly in our clinic. Scheduling these cycles is critical in a busy unit like ours. This is why we have to prove if a NC really shows a better outcome than other endometrium preparation protocols. METHODS: Hence we carried out a prospective study between June 2011 and June 2012, which included 530 patients (570 FET cycles) randomly allocated to two study groups: Group 1 (n=280 cycles), artificial cycle (HRT); or group 2 (n=290 cycles), natural cycle...
April 28, 2017: Rambam Maimonides Medical Journal
https://www.readbyqxmd.com/read/28466951/molecularly-thin-anatase-field-effect-transistors-fabricated-through-the-solid-state-transformation-of-titania-nanosheets
#20
S Sekizaki, M Osada, K Nagashio
We demonstrate the field-effect transistor (FET) operation of a molecularly-thin anatase phase produced through solid state transformation from Ti0.87O2 nanosheets. A monolayer Ti0.87O2 nanosheet with a thickness of 0.7 nm is a two-dimensional oxide insulator in which Ti vacancies are incorporated, rather than oxygen vacancies. Since the fabrication method, in general, largely affects the film quality, the anatase films derived from the Ti0.87O2 nanosheets show interesting characteristics, such as no photocurrent peak at ∼2 eV, which is related to oxygen vacancies, and a larger band gap of 3...
May 18, 2017: Nanoscale
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