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( Qiong Liu ),( Jie Yi ),( Kang Liang ),( Xiangmin Zhang ),( Qing Liu ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.8
Foodborne contamination and salmonellosis caused by Salmonella Enteritidis (S. Enteritidis) are a significant threat to human health and poultry enterprises. Outer membrane vesicles (OMVs), which are naturally secreted by gram-negative bacteria, could be a good vaccine option because they have many biologically active substances, including lipopolysaccharides (LPS), outer membrane proteins (OMPs), and phospholipids, as well as periplasmic components. In the present study, we purified OMVs derived from S. Enteritidis and analyzed their characteristics through silver staining and sodium dodecyl sulfate polyacrylamide gel electrophoresis. In total, 108 proteins were identified in S. Enteritidis OMVs through liquid chromatography tandem mass spectrometry analysis, and OMPs, periplasmic proteins, and extracellular proteins (49.9% of total proteins) were found to be enriched in the OMVs compared with bacterial cells. Furthermore, native OMVs used in immunizations by either the intranasal route or the intraperitoneal route could elicit significant humoral and mucosal immune responses and provide strong protective efficiency against a lethal dose (~100-fold LD<sub>50</sub>) of the wild-type S. Enteritidis infection. These results indicated that S. Enteritidis OMVs might be an ideal vaccine strategy for preventing S. Enteritidis diseases.
Wu, Qiong,Kang, Hee Kyung,Oh, Byul Nim,Kim, Jinheung AmericanChemical Society 2012 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.116 No.14
<P>Single-stranded oligonucleotides (ssDNA) containing guaninebasesin their sequences were adsorbed onto gold nanoparticles (AuNPs) byelectrostatic interaction. Cyclic voltammetry of Ru(bpy)<SUB>3</SUB><SUP>2+</SUP> in the presence of the ssDNA-AuNP complex resultedin an enhanced anodic current due to the oxidation of the guaninebases of DNA. The current obtained with ssDNA-AuNP appeared much smallerthan the corresponding ssDNA alone. This current reduction was dueto the decrease in solvent accessibility of the guanines in ssDNAimmobilized to AuNPs. A progressive decrease in the current was observedin the titration of AuNPs to ssDNA, and a minimum current was eventuallyobtained, indicating complete binding of ssDNA. The size dependencesof AuNPs on the interaction between ssDNA and AuNP were also studied,and the ssDNA adsorbed to 5 nm AuNPs was more solvent-accessible forthe Ru mediator than 13 and 30 nm AuNPs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-14/jp209470g/production/images/medium/jp-2011-09470g_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp209470g'>ACS Electronic Supporting Info</A></P>
Jia Yang,Qiong Kang,Bin Zhang,Xiyu Tian,Shuzheng Liu,Gang Qin,Qiang Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Ionic conductive hydrogel-based sensors have been capturing growing attention in various areas, but stillcannot satisfy the operating requirements of next generation wearable electronics. Herein, inspired bybiosystems, we demonstrate ionic conductive supramolecular hydrogels with simple one-step methodbased on salting-out effect and multiple hydrogen bond interactions. The supramolecular hydrogels exhibithigh toughness and strength, quick self-recovery, high sensitive sensing performance as well as goodself-healing, fatigue and frost resistances in mechanical and sensing properties, and can monitor largeand subtle movements and physiological activities of the human body sensitively, quickly and stably. Thus, it provides a convenient and promising way to obtain stretchable sensors of excellent comprehensiveproperties, which have tremendous application potential as wearable electronic devices in harshenvironments.
Emission Detection of Mercuric Ions in Aqueous Media Based-on Dehybridization of DNA Duplexes
Oh, Byul-Nim,Wu, Qiong,Cha, Mi-Sun,Kang, Hee-Kyung,Kim, Jin-Ah,Kim, Ka-Young,Rajkumar, Eswaran,Kim, Jin-Heung Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.9
To quantify the presence of mercuric ions in aqueous solution, double-stranded DNA (dsDNA) of poly(dT) was employed using a light switch compound, $Ru(phen)_2(dppz)^{2+}$ (1) which is reported to intercalate into dsDNA of a right-handed B-form. Addition of mercuric ions induced the dehybridization of poly(dT)${\cdot}$poly(dA) duplexes to form a hairpin structure of poly(dT) at room temperature and the metal-to-ligand charge transfer emission derived from the intercalation of 1 was reduced due to the dehybridization of dsDNA. As the concentration of $Hg^{2+}$ was increased, the emission of 1 progressively decreased. This label-free emission method had a detection limit of 0.2 nM. Other metal ions, such as $K^+$, $Ag^+$, $Ca^{2+}$, $Mg^{2+}$, $Zn^{2+}$, $Mn^{2+}$, $Co^{2+}$, $Ni^{2+}$, $Cu^{2+}$, $Cd^{2+}$, $Cr^{3+}$, $Fe^{3+}$, had no significant effect on reducing emission. This emission method can differentiate matched and mismatched poly(dT) sequences based on the emission intensity of dsDNA.
In Vivo Assessment of Neurodegeneration in Type C Niemann-Pick Disease by IDEAL-IQ
Ruo-Mi Guo,Qing-Ling Li,Zhong-Xing Luo,Wen Tang,Ju Jiao,Jin Wang,Zhuang Kang,Shao-Qiong Chen,Yong Zhang 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.1
Objective: To noninvasively assess the neurodegenerative changes in the brain of patients with Niemann-Pick type C (NPC) disease by measuring the lesion tissue with the iterative decomposition of water and fat with echo asymmetry and least square estimation-iron quantification (IDEAL-IQ). Materials and Methods: Routine brain MRI, IDEAL-IQ and 1H-proton magnetic resonance spectroscopy (1H-MRS, served as control) were performed on 12 patients with type C Niemann-Pick disease (4 males and 8 females; age range, 15−61 years; mean age, 36 years) and 20 healthy subjects (10 males and 10 females; age range, 20−65 years; mean age, 38 years). The regions with lesion and the normal appearing regions (NARs) of patients were measured and analyzed based on the fat/water signal intensity on IDEAL-IQ and the lipid peak on 1H-MRS. Results: Niemann-Pick type C patients showed a higher fat/water signal intensity ratio with IDEAL-IQ on T2 hyperintensity lesions and NARs (3.7−4.9%, p < 0.05 and 1.8−3.0%, p < 0.05, respectively), as compared to healthy controls (HCs) (1.2−2.3%). After treatment, the fat/water signal intensity ratio decreased (2.2−3.4%), but remained higher than in the HCs (p < 0.05). The results of the 1H-MRS measurements showed increased lipid peaks in the same lesion regions, and the micro-lipid storage disorder of NARs in NPC patients was detectable by IDEAL-IQ instead of 1H-MRS. Conclusion: The findings of this study suggested that IDEAL-IQ may be useful as a noninvasive and objective method in the evaluation of patients with NPC; additionally, IDEAL-IQ can be used to quantitatively measure the brain parenchymal adipose content and monitor patient follow-up after treatment of NPC.