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31.
Budi Riza Putra Luthando Tshwenya Mark A. Buckingham Jingyuan Chen Koichi Jeremiah Aoki Klaus Mathwig Omotayo A. Arotiba Abigail K. Thompson Zhongkai Li Frank Marken 《Electroanalysis》2021,33(6):1398-1418
Ionic rectifier membranes or devices generate uni-directional ion transport to convert an alternating current (AC) ion current input into stored energy or direct current (DC) in the form of ion/salt gradients. Electrochemical experiments 80 years ago were conducted on biological membrane rectifier systems, but today a plethora of artificial ionic rectifier types has been developed and electroanalytical tools are employed to explore mechanisms and performance. This overview focuses on microscale ionic rectifiers with a comparison to nano- and macroscale ionic rectifiers. The potential is surveyed for applications in electrochemical analysis, desalination, energy harvesting, electrochemical synthesis, and in selective ion extraction. 相似文献
32.
Takenobu T Bisri SZ Takahashi T Yahiro M Adachi C Iwasa Y 《Physical review letters》2008,100(6):066601
We measured the external electroluminescence quantum efficiency (eta(ext)) in light-emitting field-effect transistors (LETs) made of organic single crystals and found that, in the ambipolar transport region, eta(ext) is not degraded up to several hundreds A/cm(2) current-density range, which is 2 orders of magnitude larger than that achieved in conventional organic light-emitting diodes. The present result indicates the single-crystal organic LET is a promising device structure that is free from various kinds of nonradiative losses such as exciton dissociation near electrodes and exciton annihilations. 相似文献
33.
Maywan Hariono Rollando Rollando I Yoga Abraham Harjono Alfonsus Suryodanindro Michael Yanuar Thomas Gonzaga Zet Parabang Pandu Hariyono Rifki Febriansah Adi Hermawansyah Wahyuning Setyani Habibah Wahab 《Molecules (Basel, Switzerland)》2021,26(5)
In our previous work, the partitions (1 mg/mL) of Ageratum conyzoides (AC) aerial parts and Ixora coccinea (IC) leaves showed inhibitions of 94% and 96%, respectively, whereas their fractions showed IC50 43 and 116 µg/mL, respectively, toward Matrix Metalloproteinase9 (MMP9), an enzyme that catalyzes a proteolysis of extracellular matrix. In this present study, we performed IC50 determinations for AC n-hexane, IC n-hexane, and IC ethylacetate partitions, followed by the cytotoxicity study of individual partitions against MDA-MB-231, 4T1, T47D, MCF7, and Vero cell lines. Successive fractionations from AC n-hexane and IC ethylacetate partitions led to the isolation of two compounds, oxytetracycline (OTC) and dioctyl phthalate (DOP). The result showed that AC n-hexane, IC n-hexane, and IC ethylacetate partitions inhibit MMP9 with their respective IC50 as follows: 246.1 µg/mL, 5.66 µg/mL, and 2.75 × 10−2 µg/mL. Toward MDA-MB-231, 4T1, T47D, and MCF7, AC n-hexane demonstrated IC50 2.05, 265, 109.70, and 2.11 µg/mL, respectively, whereas IC ethylacetate showed IC50 1.92, 57.5, 371.5, and 2.01 µg/mL, respectively. The inhibitions toward MMP9 by OTC were indicated by its IC50 18.69 µM, whereas DOP was inactive. A molecular docking study suggested that OTC prefers to bind to PEX9 rather than its catalytic domain. Against 4T1, OTC showed inhibition with IC50 414.20 µM. In conclusion, this study furtherly supports the previous finding that AC and IC are two herbals with potential to be developed as triple-negative anti-breast cancer agents. 相似文献
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35.
Syahrul S. Mirmanto M. Sukmawaty S. Putra G. As’ary S. 《Journal of Applied Mechanics and Technical Physics》2021,62(2):230-237
Journal of Applied Mechanics and Technical Physics - An experimental study of a novel dryer is performed. In this current study, paddy drying is carried out using a vertical dryer. The paddy mass... 相似文献
36.
Prof. Dr. Tomoki Ogoshi Yukie Hamada Ryuta Sueto Dr. Yoko Sakata Prof. Dr. Shigehisa Akine Dr. Adhitya Mangala Putra Moeljadi Dr. Hajime Hirao Dr. Takahiro Kakuta Prof. Dr. Tada-aki Yamagishi Prof. Dr. Motohiro Mizuno 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(10):2497-2502
Host–guest complexation has been mainly investigated in solution, and it is unclear how guest molecules access the assembled structures of host and dynamics of guest molecules in the crystal state. In this study, we studied the uptake, release, and molecular dynamics of n-hexane vapor in the crystal state of pillar[5]arenes bearing different substituents. Pillar[5]arene bearing 10 ethyl groups yielded a crystal structure of herringbone-type 1:1 complexes with n-hexane, whereas pillar[5]arene with 10 allyl groups formed 1:1 complexes featuring a one-dimensional (1D) channel structure. For pillar[5]arene bearing 10 benzyl groups, one molecule of n-hexane was located in the cavity of pillar[5]arene, and another n-hexane molecule was located outside of the cavity between two pillar[5]arenes. The substituent-dependent differences in molecular arrangement influenced the uptake, release, and molecular dynamics of the n-hexane guest. The substituent effects were not observed in host–guest chemistry in solution, and these features are unique for the crystal state host–guest chemistry of pillar[5]arenes. 相似文献
37.
Miftahussurur Hamidi Putra Sebastian Seidenath Dr. Stephan Kupfer Prof. Dr. Stefanie Gräfe Prof. Dr. Axel Groß 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(68):17104-17114
Conductive polymers represent a promising alternative to semiconducting oxide electrodes typically used in dye-sensitized cathodes as they more easily allow a tuning of the physicochemical properties. This can then also be very beneficial for using them in light-driven catalysis. In this computational study, we address the coupling of Ru-based photosensitizers to a polymer matrix by combining two different first-principles electronic structure approaches. We use a periodic density functional theory code to properly account for the delocalized nature of the electronic states in the polymer. These ground state investigations are complemented by time-dependent density functional theory simulations to assess the Franck-Condon photophysics of the present photoactive hybrid material based on a molecular model system. Our results are consistent with recent experimental observations and allow to elucidate the light-driven redox chemical processes – eventually leading to charge separation – in the present functional hybrid systems with potential application as photocathode materials. 相似文献
38.
Yui Hagiwara Ananda Putra Akira Kakugo Hidemitsu Furukawa Jian Ping Gong 《Cellulose (London, England)》2010,17(1):93-101
Using the double-network (DN) method, bacterial cellulose/polyacrylamide (BC/PAAm) DN gels able to sustain not only high elongation
but also high compression have been synthesized by combining BC gel as the first network with PAAm as the second network in
the presence of N,N′-methylene bisacrylamide (MBAA) as a cross-linker. This DN gel was obtained by modifying the monomer concentration of the
second network, acrylamide monomer (AAm) and MBAA, and by controlling the water content of the first network, BC gel. The
mechanical properties are discussed in term of the swelling degree (q), which is independent of the concentration of AAm and MBAA. It was found that, for BC/PAAm DN gels with the first network
formed from BC gel with high q (BC
q=120), the tensile and compressive modulus (E) scales with q as E μ q - 2 E \propto q^{ - 2} . The tensile fracture stress, σ
F, of this DN gel was almost independent of q, that is
s\textF μ q0, \sigma_{\text{F}} \propto q^{0}, but the compressive fracture stress, σ
F, scaled with q as E μ q - 2 E \propto q^{ - 2} . Meanwhile, the tensile and compressive fracture strain (ε
F) of the gel is almost independent of q, which is caused by AAm concentration change, but linearly increased with q, which is caused by MBAA concentration change. Furthermore, by decreasing the water content of the BC gel prior to polymerization
of the second (PAAm) network, a ligament-like tough BC/PAAm DN gel could be obtained with tensile strength of 40 MPa. 相似文献
39.
Vijayarathna S Zakaria Z Chen Y Latha LY Kanwar JR Sasidharan S 《Molecules (Basel, Switzerland)》2012,17(5):4860-4877
The urgent need to treat multi-drug resistant pathogenic microorganisms in chronically infected patients has given rise to the development of new antimicrobials from natural resources. We have tested Elaeis guineensis Jacq (Arecaceae) methanol extract against a variety of bacterial, fungal and yeast strains associated with infections. Our studies have demonstrated that E. guineensis exhibits excellent antimicrobial activity in vitro and in vivo against the bacterial and fungal strains tested. A marked inhibitory effect of the E. guineensis extracts was observed against C. albicans whereby E. guineensis extract at ?, 1, or 2 times the MIC significantly inhibited C. albicans growth with a noticeable drop in optical density (OD) of the bacterial culture. This finding confirmed the anticandidal activity of the extract on C. albicans. Imaging using scanning (SEM) and transmission (TEM) electron microscopy was done to determine the major alterations in the microstructure of the extract-treated C. albicans. The main abnormalities noted via SEM and TEM studies were the alteration in morphology of the yeast cells. In vivo antimicrobial activity was studies in mice that had been inoculated with C. albicans and exhibited good anticandidal activity. The authors conclude that the extract may be used as a candidate for the development of anticandidal agent. 相似文献
40.
We consider a distance generalisation of the strong chromatic index and the maximum induced matching number. We study graphs of bounded maximum degree and Erd?s–Rényi random graphs. We work in three settings. The first is that of a distance generalisation of an Erd?s–Ne?et?il problem. The second is that of an upper bound on the size of a largest distance matching in a random graph. The third is that of an upper bound on the distance chromatic index for sparse random graphs. One of our results gives a counterexample to a conjecture of Skupień. 相似文献