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Wu, Kan,Park, Ji Young,Al-Saadon, Rachael,Nam, Hyerim,Lee, Yujin,Top, Siden,Jaouen, Gé,rard,Baik, Mu-Hyun,Geiger, William E. American Chemical Society 2018 Organometallics Vol.37 No.12
<P>The oxidative electrochemical behavior of 1,1′-diphenyl-2-cymantrenylbutene (<B>1</B>), a cymantrene analogue of the breast cancer drug ferrocifen, was shown to involve the sequential electron-transfer series <B>1</B>/<B>1</B><SUP>+</SUP>/<B>1</B><SUP>2+</SUP> in dichloromethane/0.05 M [NBu<SUB>4</SUB>][B(C<SUB>6</SUB>F<SUB>5</SUB>)<SUB>4</SUB>] (<I>E</I><SUB>1/2</SUB> values 0.78 and 1.18 V vs ferrocene). By a combination of spectroscopic and computational techniques, it was shown that the cymantrene functionality plays an important role in dissipating the positive charges in the oxidized compounds and is therefore an active participant in the redox events. The redox-active orbital goes from roughly equal degrees of organometallic and π-organic (diphenylolefin) makeup in <B>1</B> to increasingly organic based fractions in <B>1</B><SUP>+</SUP> and <B>1</B><SUP>2+</SUP>. Structural changes mimicking those of oxidized tetrakis(aryl)ethylenes accompany the one-electron oxidations. There is sufficient unpaired electron density on the manganese center in <B>1</B><SUP>+</SUP> to allow for oxidatively induced ligand exchange of one or more of the carbonyl ligands with donor ligands, including phosphites and pyridine. The complex Mn(CO)<SUB>2</SUB>P(OPh)<SUB>3</SUB>(η<SUP>5</SUP>-C<SUB>5</SUB>H<SUB>4</SUB>(Et)C═C(C<SUB>6</SUB>H<SUB>5</SUB>)<SUB>2</SUB>) was prepared by the “electrochemical switch” method, wherein [Mn(CO)<SUB>2</SUB>P(OPh)<SUB>3</SUB>(η<SUP>5</SUP>-C<SUB>5</SUB>H<SUB>4</SUB>(Et)C═C(C<SUB>6</SUB>H<SUB>5</SUB>)<SUB>2</SUB>)]<SUP>+</SUP>, produced by the oxidation of <B>1</B> in the presence of P(OPh)<SUB>3</SUB>, was reduced back to the neutral CO-substituted complex.</P> [FIG OMISSION]</BR>
DAB Converter Based on Unified High-Frequency Bipolar Buck-Boost Theory for Low Current Stress
Kan, Jia-rong,Yang, Yao-dong,Tang, Yu,Wu, Dong-chun,Wu, Yun-ya,Wu, Jiang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
This paper proposes a unified high-frequency bipolar buck-boost (UHFBB) control strategy for a dual-active-bridge (DAB), which is derived from the classical buck and boost DC/DC converter. It can achieve optimized current stress of the switches and soft switching in wider range. The UHFBB control strategy includes multi-control-variables, which can be achieved according to an algorithm derived from an accurate mathematical model. The design method for the parameters, such as the transformer turns ratio and the inductance, are shown. The current stress of the switches is analyzed for selecting an optimal inductor. The analysis is verified by the experimental results within a 500W prototype.
Kan, Jia-rong,Jiang, Hui,Tang, Yu,Wu, Dong-chun,Wu, Yun-ya,Wu, Jiang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
A novel islanding detection method is proposed in this paper. It is based on a frequency drooping PLL, which was presented in a previous work. The cause of errors in the non-detection zone (NDZ) of conventional frequency disturbance islanding detection methods (IDM) is analyzed. A frequency drooping phase-locked-loop (FD-PLL) is introduced into a single-phase grid-connected inverter (SPGCI), which can guarantee that grid current is in phase with the grid voltage. A novel FD-PLL IDM is proposed by improving this PLL. In order to verify the performance of the proposed FD-PLL IDM, a full performance comparison between the proposed IDM and typical existing active frequency drift IDMs is carried out, which includes both dynamic performance and steady performance. With the same NDZ, the total harmonic distortion of the grid-current in the dynamic process and steady state is analyzed. The proposed FD-PLL IDM, regardless of the dynamic or steady process, has the best power quality. Experimental and simulation results verify that the proposed FD-PLL IDM has excellent performance.
Kui Wu,Yangyun Zheng,Qingping Wu,Haiying Chen,Songzhe Fu,Biao Kan,Yongyan Long,Xiansheng Ni,Junling Tu 한국미생물학회 2019 The journal of microbiology Vol.57 No.12
In order to adapt to different environments, Vibrio parahaemolyticus employed a complicated quorum sensing system to orchestrate gene expression and diverse colony morphology patterns. In this study, the function of the putative quorum sensing signal synthase gene cqsA (VPA0711 in V. parahaemolyticus strain RIMD2210633 genome) was investigated. The cloning and expression of V. parahaemolyticus cqsA in Escherichia coli system induced the production of a new quorum sensing signal that was found in its culture supernatant. The signal was purified by high performance liquid chromatography methods and determined to be 3-hydroxyundecan- 4-one by indirect and direct mass spectra assays. The deletion of cqsA in RIMD2210633 changed V. parahaemolyticus colony morphology from the classical ‘fried-egg’ shape (thick and opaque in the center, while thin and translucent in the edge) of the wild-type colony to a ‘pancake’ shape (no significant difference between the centre and the edge) of the cqsAdeleted colony. This morphological change could be restored by complementary experiment with cqsA gene or the signal extract. In addition, the expression of opaR, a well-known quorum sensing regulatory gene, could be up-regulated by cqsA deletion. Our results suggested that V. parahaemolyticus used cqsA to produce 3-hydroxyundecan-4-one signal and thereby regulated colony morphology and other quorum sensing-associated behaviors.
Chun-Han Wu,Chung-Kan Peng,Chi-Hsian Chung,Wu-Chien Chien,Nian-Sheng Tzeng 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.4
Objective There is limited clarity concerning the risk of dementia after pneumonia with intensive care unit (ICU) stay. We conducted a nationwide cohort study, which aimed to investigate the impact of dementia after pneumonia with and without intensive care unit admission.Methods Data was obtained from Taiwan’s National Health Insurance Research Database between 2000 and 2015. A total of 7,473 patients were identified as having pneumonia required ICU stay, along with 22,419 controls matched by sex and age. After adjusting for confounding factors, multivariate Cox regression model analysis was used to compare the risk of developing dementia during the 15-years follow-up period.Results The enrolled pneumonia patients with ICU admission had a dementia rate of 9.89%. Pneumonia patients without ICU admission had a dementia rate of 9.21%. The multivariate Cox regression model analysis revealed that the patients with ICU stay had the higher risk of dementia, with a crude hazard ratio of 3.371 (95% confidence interval, 3.093–3.675; p<0.001).Conclusion This study indicated that pneumonia with ICU stay is associated with an increased risk of dementia. A 3-fold risk of dementia was observed in patients admitted to the ICU compared to the control group.
DAB Converter Based on Unified High-Frequency Bipolar Buck-Boost Theory for Low Current Stress
Jia-rong Kan,Yao-dong Yang,Yu Tang,Dong-chun Wu,Yun-ya Wu,Jiang Wu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
This paper proposes a unified high-frequency bipolar buck-boost (UHFBB) control strategy for a dual-active-bridge (DAB), which is derived from the classical buck and boost DC/DC converter. It can achieve optimized current stress of the switches and soft switching in wider range. The UHFBB control strategy includes multi-control-variables, which can be achieved according to an algorithm derived from an accurate mathematical model. The design method for the parameters, such as the transformer turns ratio and the inductance, are shown. The current stress of the switches is analyzed for selecting an optimal inductor. The analysis is verified by the experimental results within a 500W prototype.
Jia-rong Kan,Hui Jiang,Yu Tang,Dong-chun Wu,Yun-ya Wu,Jiang Wu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
A novel islanding detection method is proposed in this paper. It is based on a frequency drooping PLL, which was presented in a previous work. The cause of errors in the non-detection zone (NDZ) of conventional frequency disturbance islanding detection methods (IDM) is analyzed. A frequency drooping phase-locked-loop (FD-PLL) is introduced into a single-phase grid-connected inverter (SPGCI), which can guarantee that grid current is in phase with the grid voltage. A novel FD-PLL IDM is proposed by improving this PLL. In order to verify the performance of the proposed FD-PLL IDM, a full performance comparison between the proposed IDM and typical existing active frequency drift IDMs is carried out, which includes both dynamic performance and steady performance. With the same NDZ, the total harmonic distortion of the grid-current in the dynamic process and steady state is analyzed. The proposed FD-PLL IDM, regardless of the dynamic or steady process, has the best power quality. Experimental and simulation results verify that the proposed FD-PLL IDM has excellent performance.
Kan Chen,Hai-Jun Wu,Jian-Feng Chen,Xiao-Fang Cheng,Xiao Jing,Xin-Yu Wang 한국식물생명공학회 2012 Plant biotechnology reports Vol.6 No.2
Several different proteins expressed in embryogenic and nonembryogenic Eruca sativa calli were identified by combining one-dimensional SDS-PAGE protein mapping with matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. By querying the widely recognized MASCOT search engine, it was found that three of the proteins that were particularly strongly expressed in the embryogenic callus represented sucrose synthase, phospholipase D, and enolase, respectively. RT-PCR analysis also confirmed that the gene coding for enolase was transcribed especially strongly in the embryogenic callus but not in nonembyogenic callus. Finally, the relationship between the three proteins and somatic embryogenesis is discussed.
Wu, Shuping,Dai, Xiangzi,Shilong, Fangdi,Zhu, Maiyong,Shen, Xiaojuan,Zhang, Kan,Li, Songjun 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.1
Coordination compounds play an important role in the life process, and have been widely used in food, cosmetics and pharmaceutical industry. Herein, we have developed a novel kind of glucosamine-zinc(II) complex (GlcN-ZC) for food additive using non-enzymatic browning reaction. The GlcN-ZC was characterized by FTIR and XRD. Moreover, UV absorbance changes, browning intensity, fluorescence changes, antioxidant activity and antimicrobial assessment of GlcN-ZC were also evaluated. Results showed the GlcN-ZC intermediate compounds were accumulated in non-enzymatic browning while prolonging heating time and melanoidins were produced in the final stage. The fluorescence changes confirmed that fluorophores were formed during the non-enzymatic reaction and fluorescence intensity reached a maximun at 60 min. The highest radical scavenging activity of GlcN-ZC formed after 180 min of heating was 79.2%. Furthermore, GlcN-ZC exhibited excellent antibacterial activity against E. coli and S. aureus. Therefore, GlcN-ZC can be used as a novel promising additive in the food industry.