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https://www.readbyqxmd.com/read/28822179/-research-of-genes-expression-related-to-ginsenosides-biosynthesis-by-methyl-jasmonic-acid-in-ginseng-hair-roots
#1
Kang-Yu Wang, Li-Li Yu, Mei-Ping Zhang, Rui Yin, Yan-Ping Lin, Ming-Zhu Zhao, Chun-Yu Sun, Yi Wang
In order to obtain the expression of ginsenoside biosynthetic pathway related enzyme gene in ginseng hairy root under the control of elicitors, methyl jasmonate (MeJA) was added exogenously as elicitors. Ginseng hairy root clones induced by 4-year-old ginseng root was used as material, total saponin content in ginseng hairy root before and after MeJA treatment was determined by vanillin-sulfuric acid colorimetry, Meanwhile, relative expression of squalene synthase genes, squalene epoxidase genes, oxidized squalene cyclase genes, dammarenediol synthase genes, β-amyrin synthase genes, cycloartenol synthase genes before and after MeJA treatment were determined by Real-time PCR...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28819803/if-at-first-you-don-t-succeed%C3%A2-%C3%A2-adoption-of-ipad-marking-for-high-stakes-assessments
#2
Terry Judd, Anna Ryan, Eleanor Flynn, Geoff McColl
Large-scale interview and simulation-based assessments such as objective structured clinical examinations (OSCEs) and multiple mini interviews (MMIs) are logistically complex to administer, generate large volumes of assessment data, and are strong candidates for the adoption of computer-based marking systems. Adoption of new technologies can be challenging, and technical failures, which are relatively commonplace, can delay and/or create resistance to ongoing implementation.This paper reports on the adoption process of an electronic marking system for OSCEs and MMIs following an unsuccessful initial trial...
August 17, 2017: Perspectives on Medical Education
https://www.readbyqxmd.com/read/28809536/ternary-solar-cells-based-on-two-small-molecule-donors-with-same-conjugated-backbone-the-role-of-good-miscibility-and-hole-relay-process
#3
Liangang Xiao, Tianxiang Liang, Ke Gao, Tianqi Lai, Xuebin Chen, Feng Liu, Thomas P Russell, Fei Huang, Xiaobin Peng, Yong Cao
Ternary organic solar cells (OSCs) are very attractive for further enhancing the power conversion efficiencies (PCEs) of binary ones but still with a single active layer. However, improving the PCEs is still challenging because a ternary cell with one more component is more complicated on phase separation behavior. If the two donors or two acceptors have similar chemical structures, good miscibility can be expected to reduce the try-and-error work. Herein, we report ternary devices based on two small molecule donors with the same backbone but different substituents...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809535/ternary-organic-solar-cells-with-coumarin7-as-the-donor-exhibiting-over-10-power-conversion-efficiency-and-a-high-fill-factor-of-75
#4
Xinwei Chen, Si-Lu Tao, Cong Fan, Dongcheng Chen, Ling Zhou, Hui Lin, Cai-Jun Zheng, Shi-Jian Su
Ternary bulk heterojunction (BHJ) is a brilliant photovoltaic technology for improving the performance of organic solar cells (OSCs), since the light absorption range can be significantly extended by using multiple donors or acceptor materials. In this paper, coumarin7 (C7), a small organic molecule typical led used in organic light-emitting diodes, was initially exploited as second electron-donor component in ternary bulk heterojunction OSCs along with conventional blend system spolythieno[3,4-b]-thiophene/benzodithiophene(PTB7) and [6,6]-phenyl-C71 -butyric acid methyl(PC71 BM)...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28802153/a-theoretical-exploration-of-the-effect-of-fluorine-and-cyano-substitutions-in-diketopyrrolopyrrole-based-polymer-donor-for-organic-solar-cells
#5
Zhi-Wen Zhao, Qing-Qing Pan, Shuang-Bao Li, Yu-Ai Duan, Yun Geng, Min Zhang, Zhong-Min Su
A series of polymer donor materials 1-5 based on diketopyrrolopyrrole and thiophene unit which have been widely used in organic solar cells (OSCs) were investigated based on quantum chemical calculations. The effect of fluorine and cyano substitutions in polymer donor materials was focused on. Based on the investigation on electronic structures and optical properties of the reported molecules 1 and 2 and the analysis on some parameters relevant to charge dissociation ability at donor/acceptor interface constituted by 1 and 2 with PC61BM such as intermolecular charge transfer and recombination, driving force and Coulombic bound energy, we explained why fluorine substitution can improve OPV efficiency through strengthening eletron-withdrawing ability from a theoretical perspective...
August 2, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28800213/on-the-dynamics-of-additive-migration-to-form-cathodic-interlayers-in-organic-solar-cells
#6
Jane Vinokur, Stas Obuchovsky, Igal Deckman, Lishai Shoham, Tom Mates, Michael L Chabinyc, Gitti L Frey
Migration of additives to organic/metal interfaces can be used to self-generate interlayers in organic electronic devices. To generalize this approach for different additives, metals and organic electronic devices it is first necessary to study the dynamics of additive migration from the bulk to the top organic/metal interface. In this study we focus a known cathode interlayer material, polyethylene glycol (PEG), as additive in P3HT:PC71BM blends and study its migration to the blend/Al interface during metal deposition, and its effect on organic solar cell (OSC) performance...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28795560/pdi-derivative-through-fine-tuning-molecular-structure-for-fullerene-free-organic-solar-cells
#7
Hua Sun, Xin Song, Jian Xie, Po Sun, Peiyang Gu, Chang Mei Liu, Fei Chen, Qi Chun Zhang, Zhi-Kuan Chen, Wei Huang
A perylenediimide (PDI)-based small molecular (SM) acceptor with both an extended π-conjugation and a three dimensional structure concurrently is critical for achieving high performance PDI-based fullerene-free organic solar cells (OSCs). In this work, we designed and synthesized a novel PDI-based SM acceptor possessing both characteristics by fusing PDI units with a spiro core of 4,4'-spirobi[cyclopenta[2,1-b;3,4-b']dithiophene(SCPDT) through the -position of the thiophene rings. An enhanced strong absorption in the range of 350-520 nm and arisen LUMO energy level of FSP was observed, compared with previous reported acceptor SCPDT-PDI4, in which the PDI units and SCPDT are not fused...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28795461/impact-of-test-anxiety-on-pharmacy-students-performance-in-objective-structured-clinical-examination-a-cross-sectional-survey
#8
Muhammad A Hadi, Majid Ali, Abdul Haseeb, Mahmoud M A Mohamed, Mahmoud E Elrggal, Ejaz Cheema
OBJECTIVE: To assess the association between test-related anxiety and pharmacy students' performance in the Objective Structured Clinical Examination (OSCE). METHODS: A cross-sectional survey was conducted among Year-5 Doctor of Pharmacy (PharmD) students enrolled at a public university in Saudi Arabia. Students completed Test Anxiety Inventory (TAI), a 20-item validated questionnaire used to assess test-related anxiety, prior to the commencement of a summative OSCE...
August 10, 2017: International Journal of Pharmacy Practice
https://www.readbyqxmd.com/read/28791967/highly-stable-and-flexible-graphene-cf-sub-3-sub-so-sub-2-sub-sub-2-sub-nh-graphene-transparent-conductive-electrodes-for-organic-solar-cells
#9
Sang Woo Seo, Ha Seung Lee, Dong Hee Shin, Ju Hwan Kim, Chan Wook Jang, Jong Min Kim, Sung Kim, Suk-Ho Choi
We first employ highly-stable and -flexible (CF<sub>3</sub>SO<sub>2</sub>)<sub>2</sub>NH-doped graphene (TFSA/GR) and GR-encapsulated TFSA/GR (GR/TFSA/GR) transparent conductive electrodes (TCEs) prepared on polyethylene terephthalate substrates for flexible organic solar cells (OSCs). Compared to conventional indium tin oxide (ITO) TCEs, the TFSA-doped-GR TCEs show higher optical transmittance and larger sheet resistance. The TFSA/GR and GR/TFSA/GR TCEs show work functions of 4...
August 9, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28780950/is-there-a-relationship-between-how-mri-is-learned-and-knowledge
#10
C Westbrook
RATIONALE: The aim of this study was to discover whether a specialised undergraduate degree in magnetic resonance imaging (MRI) is a better way of educating MRI practitioners than experiential methods, and how necessary it is to first qualify as a radiographer to practice. This study compared the knowledge between individuals who qualify as a radiographer and then only learn MRI experientially (experiential practitioners), to those who learn only via a specialised undergraduate degree in MRI and enter practice directly without first qualifying as a radiographer (graduate practitioners)...
September 2017: Radiography
https://www.readbyqxmd.com/read/28774522/integrating-retinal-simulation-with-a-peer-assessed-group-osce-format-to-teach-direct-ophthalmoscopy
#11
Imran H Yusuf, Edward Ridyard, Timothy H M Fung, Zuzana Sipkova, Chetan K Patel
OBJECTIVE: To describe the conception and evaluation of a novel educational intervention to teach direct ophthalmoscopy with retinal simulators using a peer-assessed group objective structured clinical examination (OSCE) format. DESIGN: Prospective, single-centre educational trial at Oxford University Medical School, Oxford, U.K. PARTICIPANTS: A total of 160 consecutive undergraduate fifth-year medical students participated in the study. METHODS: Students identified prior experience, teaching, examination, and feedback relevant to direct ophthalmoscopy...
August 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28773796/investigation-of-various-active-layers-for-their-performance-on-organic-solar-cells
#12
Pao-Hsun Huang, Yeong-Her Wang, Jhong-Ciao Ke, Chien-Jung Huang
The theoretical mechanism of open-circuit voltages (VOC) in OSCs based on various small molecule organic materials is studied. The structure under investigation is simple planar heterojunction (PHJ) by thermal vacuum evaporation deposition. The various wide band gaps of small molecule organic materials are used to enhance the power conversion efficiency (PCE). The donor materials used in the device include: Alpha-sexithiophene (α-6T), Copper(II) phthalocyanine (CuPc), boron subnaphthalocyanine chloride (SubNc) and boron Subphthalocyanine chloride (SubPc)...
August 9, 2016: Materials
https://www.readbyqxmd.com/read/28773177/low-temperature-preparation-of-tungsten-oxide-anode-buffer-layer-via-ultrasonic-spray-pyrolysis-method-for-large-area-organic-solar-cells
#13
Ran Ji, Ding Zheng, Chang Zhou, Jiang Cheng, Junsheng Yu, Lu Li
Tungsten oxide (WO₃) is prepared by a low-temperature ultrasonic spray pyrolysis method in air atmosphere, and it is used as an anode buffer layer (ABL) for organic solar cells (OSCs). The properties of the WO₃ transition metal oxide material as well as the mechanism of ultrasonic spray pyrolysis processes are investigated. The results show that the ultrasonic spray pyrolysized WO₃ ABL exhibits low roughness, matched energy level, and high conductivity, which results in high charge transport efficiency and suppressive recombination in OSCs...
July 18, 2017: Materials
https://www.readbyqxmd.com/read/28772849/gallic-acid-as-an-oxygen-scavenger-in-bio-based-multilayer-packaging-films
#14
Astrid F Pant, Sven Sängerlaub, Kajetan Müller
Oxygen scavengers are used in food packaging to protect oxygen-sensitive food products. A mixture of gallic acid (GA) and sodium carbonate was used as an oxygen scavenger (OSc) in bio-based multilayer packaging films produced in a three-step process: compounding, flat film extrusion, and lamination. We investigated the film surface color as well as oxygen absorption at different relative humidities (RHs) and temperatures, and compared the oxygen absorption of OSc powder, monolayer films, and multilayer films...
May 3, 2017: Materials
https://www.readbyqxmd.com/read/28755908/communication-skills-in-candidates-for-accreditation-in-rheumatology-are-correlated-with-candidate-s-performance-in-the-objective-structured-clinical-examination
#15
Virginia Pascual-Ramos, Diana Elsa Flores-Alvarado, Margarita Portela-Hernández, María Del Rocío Maldonado-Velázquez, Luis Manuel Amezcua-Guerra, Judith López-Zepeda, Everardo Álvarez, Nadina Rubio, Olga Vera Lastra, Miguel Ángel Saavedra, César Alejandro Arce-Salinas
BACKGROUND: The Mexican Accreditation Council for Rheumatology annually certifies trainees in Rheumatology using a multiple-choice test and an objective structured clinical examination (OSCE). Since 2015, candidate's communication skills (CS) have been rated by both patients and by physician examiners and correlated with results on the OSCE. This study compared the CS from candidates to annual accreditation in Rheumatology as rated by patients and by physician examiners, and assessed whether these correlated with candidate's performance in the OSCE...
July 26, 2017: Reumatología Clinica
https://www.readbyqxmd.com/read/28749198/empathy-training-in-medical-students-a-randomized-controlled-trial
#16
M Wündrich, C Schwartz, B Feige, D Lemper, C Nissen, U Voderholzer
AIM: Empathy is a core element in the doctor-patient relationship. This study examined whether empathy in medical students can be improved by specific training. METHODS: 158 medical students were randomized into two groups. The intervention group participated in an empathy skills training with simulated patients (SPs). The control group participated in a history course. After the intervention, empathy was assessed by blinded SPs and experts in an Objective Structured Clinical Examination (OSCE)...
July 27, 2017: Medical Teacher
https://www.readbyqxmd.com/read/28747832/effects-of-various-calcium-powders-as-replacers-for-synthetic-phosphate-on-the-quality-properties-of-ground-pork-meat-products
#17
Su Min Bae, Min Guk Cho, Jong Youn Jeong
The aim of this study was to identify the optimal and superior type of natural calcium for replacing phosphate in cooked ground pork products. To achieve this, 0.5% eggshell calcium (ESC), oyster shell calcium (OSC), marine algae calcium (MAC), or milk calcium (MC) was added to ground pork meat products. The effect of this substitution was studied by comparing the substituted products with products containing 0.3% phosphate blend (control). ESC was considered an ideal phosphate replacer for minimizing the cooking loss, which likely resulted from the increase in the pH of the product...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28742546/flipping-the-objective-structured-clinical-examination-a-teaching-innovation-in-graduate-nursing-education
#18
Cristi Day, Connie Barker, Eva Bell, Elizabeth Sefcik, Deborah Flournoy
Objective evaluation of distance-based family nurse practitioner (FNP) students can be challenging. One FNP program piloted a teaching innovation, the video-enhanced objective structured clinical examination (VE-OSCE) or "flip" of the traditional face-to-face OSCE, to assess student clinical performance in a controlled online environment using a teleconferencing platform. This project sought to assess the VE-OSCE design, implementation, and ability to identify FNP student learning needs.
July 24, 2017: Nurse Educator
https://www.readbyqxmd.com/read/28742058/ito-with-embedded-silver-grids-as-transparent-conductive-electrodes-for-large-area-organic-solar-cells
#19
Bhushan Ramesh Patil, Mina Mirsafaei, Pawel Piotr Cielecki, Andre Luis Fernandes Cauduro, Jacek Fiutowski, Horst-Guenter Rubahn, Morten Madsen
In this work, development of semi-transparent electrodes for efficient large area organic solar cells (OSCs) has been demonstrated. Electron beam evaporated silver grids were embedded in commercially available ITO coatings on glass, through a standard negative photolithography process, in order to improve the conductivity of planar ITO substrates. The fabricated electrodes with embedded line and square patterned Ag grids reduced the sheet resistance of ITO by 25 % and 40 %, respectively, showing optical transmittance drops of less than 6 % within the complete visible light spectrum for both patterns...
July 25, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28737255/efficient-organic-solar-cells-with-non-fullerene-acceptors
#20
REVIEW
Shuixing Li, Wenqing Liu, Chang-Zhi Li, Minmin Shi, Hongzheng Chen
Fullerene-free OSCs employing n-type small molecules or polymers as the acceptors have recently experienced a rapid rise with efficiencies exceeding 12%. Owing to the good optoelectronic and morphological tunabilities, non-fullerene acceptors exhibit great potential for realizing high-performance and practical OSCs. In this Review, recent exciting progress made in developing highly efficient non-fullerene acceptors is summarized, mainly correlating factors like absorption, energy loss and morphology of new materials to their correspondent photovoltaic performance...
July 24, 2017: Small
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