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Why does SLIPS inhibit P.aeruginosa initial adhesion in static condition?
Yuanyuan Shen,Yihan Sun,Peng Wang,Dun Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Slippery liquid-infused porous surfaces (SLIPSs) have distinguished themselves in inhibiting bacteriaattachment and biofilm development in static conditions. However, underlying antifouling mechanisms,especially from gene level in bioinformatics, is still lacking. In this work, we investigated the initialattachment difference of Pseudomonas aeruginosa PAO1 on polydimethylsiloxane (PDMS) surface andthe infused silicone slippery surface (i-PDMS). RNA sequencing (RNA-seq) was used to investigate the differencesin the expression of PAO1 gene on elastomer surface during initial adhesion before and after oilinjection. Compared with PDMS, bacterial attachment on i-PDMS was remarkably decreased 98.0 ± 0.7 %within 10 mins. And the antifouling ability of i-PDMS significantly outperformed PDMS throughout theentire culture period of PAO1 (14 days) in static conditions. RNA-seq reveals that the down-regulatedPA1382 of PAO1 in bulk near the i-PDMS surfaces may inhibit bacterial initial adhesion. PA1382 geneencodes type II secretion outer membranes (OM) secretin, also known as type II secretion system(T2SS) protein GspD, which is involved in regulating the opening or closing of exoprotein channels, influencingbacterial adhesion and biofilm formation by controlling the secretion of toxins or effectors. Ourfindings provide a deeper understanding of the mechanism by which SLIPS inhibits initial bacterialadhesion.
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Xiaozhen Zhang,Yuhua Jiang,Xuebing Hu,Liangliang Sun,Yihan Ling 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
Proton-conducting solid oxide fuel cell (H-SOFC) based on layered perovskite type GdBaCuCoO5+x (GBCC) cathodewas fabricated with in situ drop-coating BaZr0.1Ce0.7Y0.2O3−δ (BZCY) electrolyte membrane. The influences of Cu dopinginto Co sites of GdBaCo2O5+x on the electrical conductivity and conduction mechanism, thermal expansion propertyand electrochemical performance of cathode materials and corresponding single cell were investigated. Results show thatthe electrical conductivity decreased and the conduction mechanism would gradually transform to the semiconductor-likebehavior. A high maximum power density of 480 mW cm−2 was obtained for the anode supported NiO–BZCY/NiO–BZCY/BZCY/GBCC single cells with wet H2fuel at 700 °C. The corresponding polarization resistance was as low as 0.17 Ω cm2. The excellent electrochemical performance of as-prepared single cell indicates that GBCC is a good candidate of cathodematerials for H-SOFCs.
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Wenquan Qin,Hongpeng Xiong,YuzhenWen,XiujunWen,HuiWang,Yihan Fang,TaoMa,Zhaohui Sun,Xiaoyang Chen,Cai Wang 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2
Baiting is widely applied for the detection and control of the red imported fire ants, Solenopsis invicta Buren. Adding preservatives into baits would prevent microbial contamination during production and storage, and might extend period of bait attractiveness in the field. However, it is not known if preservatives are repellent to S. invicta. In the present study, potential effects of six commonly used preservatives (potassiumsorbate, sodium benzoate, sodium diacetate, sodium dehydroacetate, calcium propionate, and nisin) on the foraging behaviors of S. invicta foragers were evaluated under laboratory and field conditions. Four-choice tests (laboratory study) showed that the number of foraging ants on the preservative-treated (immersed in 2000-, 5000-, or 10,000-ppm solution for 30 min) and control (immersed in distilled water for 30 min) food was similar, with an exception of sodium dehydroacetate, which significantly decreased the number of foraging ants at the three tested concentrations. Interestingly, 46%, 58% and 71% of the food items treated with 2000-, 5000- and 10,000- ppm solutions of sodium dehydroacetate were buried with soil particles, respectively, whereas only 17% of the control food was similarly buried. Multiple-choice tests (field study) showed that food treated with the 5000- or 10,000-ppm solution of sodium dehydroacetate attracted significantly fewer S. invicta workers compared to other preservatives and the controls. Our study showed that the use of sodiumdehydroacetate should be avoided during the production of aqueous-based or liquid baits against S. invicta.
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