Synthesis and Application of Reactive Dyes Based on Azo-Anthraquinone Skeleton to Realize Clean Printing of Cotton Fabrics

Hongjuan Zhang,Liujun Pei,Shuaitong Liang,Qun Wang,Jingming Huang,Xiaomin Gu,Jiping Wang 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5

Traditional reactive dyes generate a large amount of colored wastewater during printing owing to low reactivity,causing severe environmental problems. In this investigation, four novel reactive dyes were synthesized via incorporating azostructure into anthraquinone chromophore. They were characterized by UV-Vis, FT-IR, and 1H-NMR spectra. Their printingproperties on cotton fabric were comprehensively studied. Attributed to multifunctional groups, the fixation of the novelreactive dyes can reach 98 % even at the dye concentration of 10 %. It increases by 30 % compared with traditionalanthraquinone dyes. Moreover, the reactive dyes containing both mono-chlortriazine and bis(sulfatoethylsufone) groups canachieve urea-free printing. This research has a potential and significant application in the cleaner production of printing forcotton fabrics.

Effect of Calcium Chloride on Dyeing Property of Polyamide 66 Based on Reactive Anthraquinone Dyes with Different Structure

Hongjuan Zhang,Aiqin Gao,Kongliang Xie,Aiqin Hou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10

The effect of calcium chloride on dyeing property of polyamide 66 based on reactive anthraquinone dyes withdifferent structures were investigated. The relationship of the structure and properties of the reactive anthraquinone dyes wasdiscussed. Calcium chloride could obviously improve the exhaustion and fixation of the reactive dyes on polyamide 66. Thedyes with more sulfonate groups exhibited obviously sensitive to calcium chloride. Compared with the traditional dyeingmethod, three reactive anthraquinone dyes achieved better building up property and color yields by using calcium chloride atpH value of 7.0. Calcium chloride had obvious dyeing acceleration for polyamide 66. The anthraquinone dye withbifunctional groups could achieve higher exhaustion and excellent fastness on polyamide 66. The mechanism of calciumchloride to exert an influence on dyeing property of polyamide 66 was analyzed. This work is of great significance forimproving dyeing performance of reactive dyes on polyamide fiber.

A two-stage source extraction algorithm for temporally correlated signals based on ICA-R

Hongjuan Zhang,Zhenwei Shi,Chonghui Guo,Enmin Feng 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.5

Blind source extraction (BSE) is a special class of blind source separation (BSS) methods, which only extracts one or a subset of the sources at a time. Based on the time delay of the desired signal, a simple but important extraction algorithm (simplified ” BC algorithm”)was presented by Barros and Cichocki. However, the performance of this method is not satisfying in some cases for which it only carries out the constrained minimization of the mean squared error. To overcome these drawbacks, ICA with reference (ICA-R) based approach, which considers the higherorder statistics of sources, is added as the second stage for further source extraction. Specifically, BC algorithm is exploited to roughly extract the desired signal. Then the extracted signal in the first stage, as the reference signal of ICA-R method, is further used to extract the desired sources as cleanly as possible. Simulations on synthetic data and real-world data show its validity and usefulness.

A TWO-STAGE SOURCE EXTRACTION ALGORITHM FOR TEMPORALLY CORRELATED SIGNALS BASED ON ICA-R

Zhang, Hongjuan,Shi, Zhenwei,Guo, Chonghui,Feng, Enmin Korean Society of Computational and Applied Mathem 2008 Journal of applied mathematics & informatics Vol.26 No.5

Blind source extraction (BSE) is a special class of blind source separation (BSS) methods, which only extracts one or a subset of the sources at a time. Based on the time delay of the desired signal, a simple but important extraction algorithm (simplified " BC algorithm")was presented by Barros and Cichocki. However, the performance of this method is not satisfying in some cases for which it only carries out the constrained minimization of the mean squared error. To overcome these drawbacks, ICA with reference (ICA-R) based approach, which considers the higher-order statistics of sources, is added as the second stage for further source extraction. Specifically, BC algorithm is exploited to roughly extract the desired signal. Then the extracted signal in the first stage, as the reference signal of ICA-R method, is further used to extract the desired sources as cleanly as possible. Simulations on synthetic data and real-world data show its validity and usefulness.

Mitophagy Improves Ethanol Tolerance in Yeast: Regulation by Mitochondrial Reactive Oxygen Species in Saccharomyces cerevisiae

( Hongjuan Jing ),( Huanhuan Liu ),( Zhang Lu ),( Cui Liuqing ),( Xiaorong Tan ) 한국미생물생명공학회(구 한국산업미생물학회) 2020 Journal of microbiology and biotechnology Vol.30 No.12

Ethanol often accumulates during the process of wine fermentation, and mitophagy has critical role in ethanol output. However, the relationship between mitophagy and ethanol stress is still unclear. In this study, the expression of ATG11 and ATG32 genes exposed to ethanol stress was accessed by real-time quantitative reverse transcription polymerase chain reaction (qRT-PCR). The result indicated that ethanol stress induced expression of the ATG11 and ATG32 genes. The colony sizes and the alcohol yield of atg11 and atg32 were also smaller and lower than those of wild type strain under ethanol whereas the mortality of mutants is higher. Furthermore, compared with wild type, the membrane integrity and the mitochondrial membrane potential of atg11 and atg32 exhibited greater damage following ethanol stress. In addition, a greater proportion of mutant cells were arrested at the G1/G0 cell cycle. There was more aggregation of peroxide hydrogen (H₂O₂) and superoxide anion (O₂ ^·-) in mutants. These changes in H2O2 and O2 ·- in yeasts were altered by reductants or inhibitors of scavenging enzyme by means of regulating the expression of ATG11 and ATG32 genes. Inhibitors of the mitochondrial electron transport chain (mtETC) also increased production of H₂O₂ and O₂ ^·- by enhancing expression of the ATG11 and ATG32 genes. Further results showed that activator or inhibitor of autophagy also activated or inhibited mitophagy by altering production of H₂O₂ and O₂ ^·. Therefore, ethanol stress induces mitophagy which improves yeast the tolerance to ethanol and the level of mitophagy during ethanol stress is regulated by ROS derived from mtETC.

Ethanol Induces Autophagy Regulated by Mitochondrial ROS in Saccharomyces cerevisiae

( Hongjuan Jing ),( Huanhuan Liu ),( Lu Zhang ),( Jie Gao ),( Haoran Song ),( Xiaorong Tan ) 한국미생물 · 생명공학회 2018 Journal of microbiology and biotechnology Vol.28 No.12

Ethanol accumulation inhibited the growth of Saccharomyces cerevisiae during wine fermentation. Autophagy and the release of reactive oxygen species (ROS) were also induced under ethanol stress. However, the relation between autophagy and ethanol stress was still unclear. In this study, expression of the autophagy genes ATG1 and ATG8 and the production of ROS under ethanol treatment in yeast were measured. The results showed that ethanol stress very significantly induced expression of the ATG1 and ATG8 genes and the production of hydrogen peroxide (H₂O₂) and superoxide anion (O₂ ^·-). Moreover, the atg1 and atg8 mutants aggregated more H₂O₂ and O₂ ^·- than the wild-type yeast. In addition, inhibitors of the ROS scavenging enzyme induced expression of the ATG1 and ATG8 genes by increasing the levels of H₂O₂ and O₂ ^·-. In contrast, glutathione (GSH) and N-acetylcystine (NAC) decreased ATG1 and ATG8 expression by reducing H₂O₂ and O₂ ^·- production. Rapamycin and 3-methyladenine also caused an obvious change in autophagy levels and simultaneously altered the release of H₂O₂ and O₂ ^·-. Finally, inhibitors of the mitochondrial electron transport chain (mtETC) increased the production of H₂O₂ and O₂ ^·- and also promoted expression levels of the ATG1 and ATG8 genes. In conclusion, ethanol stress induced autophagy which was regulated by H₂O₂ and O₂ ^·- derived from mtETC, and in turn, the autophagy contributed to the elimination H₂O₂ and O₂ ^·-.

Removal of fluoroquinolone antibiotics by adsorption of dopamine-modified biochar aerogel

Hongjuan Bai,Qiaofei Zhang,Xuan Zhou,Junhang Chen,Zihan Chen,Zhuangzhuang Liu,Jun Yan,Jing Wang 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1

As emerging contaminants used for treating various tract infections, fluoroquinolones (such as enoxacin, ofloxacin, etc.) enter water bodies via point-source discharges of wastewater treatment plants and many of them raise environmental and health concerns. Herein, a novel adsorbent, derived from a useful renewable low-cost grapefruit peel, was prepared to investigate the adsorption behavior of fluoroquinolone antibiotics (enoxacin and ofloxacin). The obtained adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD) and thermo-gravimetric analysis and differential scanning calorimetry (TG-DSC). Further, the equilibrium sorption of the adsorption process was analyzed with isotherm models and kinetic models. Under optimal adsorption conditions, equilibrium data conformed to the Elovich model, and the kinetics of adsorption was fitted well with Redlich-Peterson model. Combined with thermodynamic analysis, electrostatic interaction, hydrogen bond, π-π stacking interaction were the possible adsorption mechanisms for both fluoroquinolone antibiotics onto the novel adsorbent. This work explored a promising adsorbent for the elimination of fluoroquinolone antibiotics in environmental remediation.

Characterization and catalytic application of MnCl2 modified HZSM-5 zeolites in synthesis of aromatics from syngas via dimethyl ether

Qingde Zhang,Yisheng Tan,Caihong Yang,Hongjuan Xie 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3

The conversion of syngas to aromatics via dimethyl ether was investigated over MnCl2 modified HZSM-5zeolites. The results demonstrated that 2%MnCl2 modified HZSM-5 (SiO2/Al2O3 = 38) exhibited higher pxylene selectivity than other catalysts and further decreased 1,2,4,5-tetramethylbenzene selectivity. The CO conversion was obviously increased after 5%MnCl2 modification to HZSM-5. The catalysts were characterized by XRD, BET, XPS, FT-IR, NH3-TPD, SEM, element analysis and O2-TPO. The loading amount of MnCl2 affected the adsorption and reaction of DME molecules on zeolites. Appropriate amount of MnCl2 introduction could adjust the acidity and pore volume of HZSM-5 to increase p-xylene selectivity and CO conversion.

Glypican 2 regulates cell proliferation and metastasis in thyroid cancer cells

Tao Zhang,Yahong Liu,Xuan Ren,Zhuanping Wang,Hongjuan Wang 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.2

Background Glypicans play a role in the growth and metastasis of several human cancers. However, little is known about its function in thyroid cancer. Therefore, this study aimed to investigate the specific functions of glypican 2 (GPC2) in thyroid cancer cells. Objective The expression of six glypican family members (GPC1 to GPC6) was detected in different thyroid cancer cell lines. The abnormal expression of GPC2 was confirmed by immunohistochemistry in or around thyroid tumor tissues. It was overexpressed and silenced in highly (TPC1 and FTC-133) and poorly (ARO) differentiated thyroid cancer cell lines, respectively. Subsequently, its role in cell proliferation, apoptosis, migration, and invasion was investigated. Results We observed that almost all glypican family members were highly expressed in thyroid cancer cells, and GPC2 expression was higher in poorly differentiated thyroid cancer cell lines than highly differentiated cell lines. The knockdown of GPC2 inhibited cell proliferation, invasion, and migration and promoted apoptosis in the ARO cells, whereas GPC2 overexpression promoted cell proliferation, invasion, and migration and inhibited apoptosis in the TPC1 and FTC-133 cells. Conclusions GPC2 is highly expressed in thyroid cancer tissues and regulates cell viability, apoptosis, migration, and invasion.

Power flow predictive model control to improve the efficiency of regenerative energy storage and utilization

Sun, Shizhen,Zhang, Hongjuan,Wang, Xiaoji,Gao, Yan,Jin, Baoquan The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10

In dual-motor drive systems, a supercapacitor is connected to a common direct current (DC) bus through a DC/DC converter for the storage and utilization of regenerative energy, which is an effective energy saving method. However, the uncoordinated control of this type of system results in undesirable power circulation and reduced energy utilization efficiency. In this paper, an optimal power tracking control strategy based on a power flow predictive model is proposed. The power flow of the system is analyzed and a power flow predictive model is established. In addition, an objective function is deduced from the perspective of optimal performance tracking and minimum grid side energy consumption. The reference power of a supercapacitor is obtained in real time under constraints. The power flows among the grid side, the motors, and the energy storage unit are fully coordinated to realize a reasonable energy distribution. Experimental results indicate that the energy utilization efficiency of the system is improved by 25.4% in comparison with double closed-loop control in one working period.