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Irene Barrios de Arenas,Karem Noris-Suárez,Maritza Vasquez,Yotselys López,Thalia San Antonio 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.2
A treatment study evaluates glass and glass-ceramics of the Na2O·CaO·K2O·MgO·SiO2·P2O5 system, modified with B2O3, Al2O3or B2O3/Al2O3 up to 0.66. Both, bioactivity using simulated body fluid (SBF) immersion and mineral nodule formation using calvaria derived osteoblasts, were tested. The surface structure changes were examined by SEM-EDX line scan X-ray microanalysis and calcium deposition by the alizarin-red test. It was found that all compositions of glasses as well as glassceramics reacted with the SBF, allowing the development of a SiO2 rich layer. In some cases the presence of a rich calcium and phosphorous layer was observed, that according to other studies, corresponds to the apatite layer identified in previous studies. This result suggests a bioactivity behavior, with the exception of the glass containing B2O3/Al2O3 = 0.66 and the glassceramic of the same composition with a 2nd heat treatment. The composition containing B2O3/Al2O3 = 0.66 showed the best biocompatibility with hydroxyapatite nodule formation on its surface, especially on the glass-ceramics.
Vertically-Aligned ZnO/InxSy Core-Shell Nanorods for High Efficient Dye-Sensitized Solar Cells
Irene Gonzalez-Valls,Belen Ballesteros,Mónica Lira-Cantu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
Innovative vertically aligned ZnO/InxSy nanorod (NR) electrodes were prepared by successive ion layer adsorption and reaction (SILAR) technique. The InxSy shell layer was deposited on top of ZnO NR electrodes of two different lengths, ~ 1.6 µm and ~ 3.2 µm. Two sulfur contents on the InxSy shell layer with different layer thicknesses were analyzed. These electrodes were fully characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), Energy-dispersive x-ray spectroscopy (EDS), Infrared spectroscopy (FT-IR), x-ray photoelectron spectroscopy (XPS) and ultraviolet photoemission spectroscopy (UPS) and then applied in dye-sensitized solar cells (DSC). Power conversion efficiency of 2.32% was observed when a low-sulfur content InxSy shell layer was applied in comparison to the stoichiometric In2S3 shell layer (0.21%) or the bare ZnO NRs (0.87%). In the case of low sulfur content, a shell layer of In(OH)xSy or/and In(OH)3 is formed as observed by the presence of –OH observed by FTIR analyses. The presence of higher amounts of hydroxide groups modifies the bandgap and work function of the InxSy shell and facilitates dye adsorption, increasing the final solar cell performance.
Irene Burckhardt,Katharina Last,,Stefan Zimmermann, 대한진단검사의학회 2019 Annals of Laboratory Medicine Vol.39 No.1
Background: The transition from manual processing of patient samples to automated workflows in medical microbiology is challenging. Although automation enables microbiologists to evaluate all samples following the same incubation period, the essential incubation times have yet to be determined. We defined essential incubation times for detecting methicillin-resistant Staphylococcus aureus (MRSA), multi-drug resistant gram-negative bacteria (MDRGN), and vancomycin-resistant enterococci (VRE). Methods: We monitored the growth kinetics of MRSA, MDRGN, and VRE between two and 48 hours on chromogenic media to establish the time points of first growth, single colony appearance, and typical morphology for 102, 104, 106, and 108 colony forming units/mL. Subsequently, we imaged plates inoculated with 778 patient samples after 20, 24, and 36 hours. Results: The first growth, single colony appearance, and typical morphology time points were inoculum-dependent. First growth appeared after 6–18 hours, 4–18 hours, and 8– 48 hours for MRSA, MDRGN, and VRE, respectively, and single colonies appeared at 12– 18 hours, 6–20 hours, and 12–48 hours, respectively. Typical morphology was visible at 14–22 hours and 12–48 hours for MRSA and VRE, but was not determined for MDRGN. By examining patient samples, ≥98% of MRSA and MDRGN were visible 20 hours after the start of incubation. Following 24 hours of incubation, only 79.5% of VRE were clearly visible on the respective plates. Conclusions: An incubation time of 20 hours is sufficient for detecting MRSA and MDRGN. VRE growth is much slower and requires additional imaging after 36 hours.
Irene Joy I. dela Peña,윤서영,김희진,심홍,김지형,정나래,백세희,서용기,박석준,문병석,정재훈 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
Effects of Opuntia ficus indica (OFI) extractson ethanol-induced psychomotor alterations were studiedusing Sprague-Dawley rats orally administered 4 g/kg ofethanol (EtOH group) or distilled water (control group). AnOFI-group received OFI extracts (50, 100, and 200 mg/kg)30 min prior to EtOH administration. Behavioral andhematological tests were evaluated 1, 2, 4, and 8 h afterEtOH administration. Electroencephalogram (EEG) assessmentwas also performed. EtOH significantly (p<0.001) inducedpsychomotor alterations (reduced locomotion, balance,coordination, muscle strength, and tolerance to cold),compared with control group rats. Pre-treatment with OFIextracts alleviated alterations and also inhibited elevationof blood ethanol levels. EEG (percent of total power fordelta, theta, alpha, and beta) results for OFI group rats weresimilar to control rats, indicating a countering of EtOHinducedEEG changes. Extracts of OFI can be effective foralleviation of psychomotor alterations induced by EtOHadministration.
( Irene Sarosiek ),( Gengqing Song ),( Yan Sun ),( Hugo Sandoval ),( Stephen Sands ),( Jiande Chen ),( Richard W Mccallum ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.2
Background/Aims Nausea, an unpleasant symptom of diabetic gastroparesis (DMGP), has been reported to be alleviated by needleless transcutaneous electrical acupuncture (TEA). Our study was designed to utilize electroencephalography (EEG) and electrogastrography (EGG) recordings to investigate the central and peripheral responses of TEA in the treatment of nausea in DMGP patients. Methods Eleven DMGP subjects underwent simultaneous EEG and EGG testing while grading the severity of nausea following 30-minute intervals of: (1) baseline, (2) visual stimulation (VS) to provoke more nausea, (3) active VS together with TEA, and (4) TEA alone, and a final 15-minute recording without any intervention. Results The nausea score was increased to 5.9 ± 1.5 with VS (P < 0.05, vs 3.5 ± 1.0 at baseline), then reduced to 3.5 ± 1.2 with VS plus TEA, and to 2.5 ± 1.3 with TEA alone, while it continued at a score of 2.9 ± 1.0 post TEA (all significant, P < 0.05, vs VS without TEA). The mean percentage of normal gastric slow waves was decreased to 60.0 ± 5.7% with VS (P < 0.05, vs 66.6 ± 4.5% at baseline), then improved to 69.2 ± 4.8% with VS plus TEA, and maintained at 70 ± 3.6% with TEA alone. During initial VS, EEG signals showed right inferior frontal activity as the prominent finding, but during VS with TEA, left inferior frontal activity predominated. Conclusions In DMGP, TEA improves gastric dysrhythmia and ameliorates nausea. TEA treatment of nausea provoked by VS resulted in a change of dominance from right to left inferior frontal lobe activity. These data provide new understandings of peripheral and central mechanisms for nausea, and potential future directions for DMGP treatment approaches. (J Neurogastroenterol Motil 2017;23:245-253)
The power of negative publicity on the fast fashion industry
Irene Roozen,Mariet Raedts 한국마케팅과학회 2020 Journal of Global Fashion Marketing Vol.11 No.4
The aim of this paper is to examine the impact of negative reporting in the media (hereafter negative publicity) about the fast fashion industry on the attitude of (potential) consumers towards fast fashion apparels. This is done on the basis of three experimental studies. These studies also analyzed if visual and written publicity about the working conditions in the production process and environmentally related information, e.g. environmentally unfriendly externalities of the fast fashion production process, can influence the attitude towards fast fashion apparels, i.e. intention to buy, liking, attitude towards the brand. Furthermore, the studies investigated if differences between consumers (e.g. attitude towards slow fashion, fashion involvement, and ethical and environmental consciousness of consumers) significantly influence the impact of such information on consumer attitudes. The findings of the three studies show that negative (audiovisual and written) publicity about the environmental impact and working conditions of the fast fashion industry significantly negatively influence consumers’ attitudes towards the fast fashion industry. The “power” of negative publicity is also significantly stronger than that of positive publicity and is enhanced by the consciousness of consumers towards the social and ecological impact of the fashion industry.
Irene Joy I. dela Peña,김희진,Chrislean Jun Botanas,June Bryan de la Peña,Thi Hong Van Le,Minh Duc Nguyen,박정힐,정재훈 고려인삼학회 2017 Journal of Ginseng Research Vol.41 No.2
Background: Panax vietnamensis Ha et Grushv. or Vietnamese ginseng (VG) is a recently discovered ginseng species. Studies on its chemical constituents have shown that VG is remarkably rich in ginseng saponins, particularly ocotillol saponins. However, the psychopharmacological effects of VG have not been characterized. Thus, in the present study we screened the psychopharmacological activities of VG in mice. Methods: VG extract (VGE) was orally administered to mice at various dosages to evaluate its psychomotor (open-field and rota-rod tests), sedativeehypnotic (pentobarbital-induced sleeping test), antistress (cold swimming test), anxiolytic (elevated plus-maze test), and cognitive (Y-maze and passiveavoidance tests) effects. Results: VGE treatment increased the spontaneous locomotor activity, enhanced the endurance to stress, reduced the anxiety-like behavior, and ameliorated the scopolamine-induced memory impairments in mice. In addition, VGE treatment did not alter the motor balance and coordination of mice and did not potentiate pentobarbital-induced sleep, indicating that VGE has no sedative-hypnotic effects. The effects of VGE were comparable to those of the Korean Red Ginseng extract. Conclusion: VG, like other ginseng products, has significant and potentially useful psychopharmacological effects. This includes, but is not limited to, psychomotor stimulation, anxiolytic, antistress, and memory enhancing effects.