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HE, XINLONG,ZOU, YUNYUN,CHO, YOUNGJAE,AHN, JUHEE International Association for Food Protection 2012 Journal of food protection Vol.75 No.6
<P>This study was designed to evaluate the effects of bile acid deconjugation by probiotic strains on the antibiotic susceptibility of antibiotic-sensitive and multiple antibiotic-resistant Salmonella Typhimurium and Staphylococcus aureus. Eight probiotic strains, Bifidobacterium longum B6, Lactobacillus acidophilus ADH, Lactobacillus brevis KACC 10553, Lactobacillus casei KACC 12413, Lactobacillus paracasei ATCC 25598, Lactobacillus rhamnosus GG, Leuconostoc mesenteroides KACC 12312, and Pediococcus acidilactici KACC 12307, were used to examine bile acid tolerance. The ability to deconjugate bile acids was evaluated using both thin-layer chromatography and high-performance liquid chromatography. The antibiotic susceptibility testing was carried out to determine the synergistic inhibitory activity of deconjugated bile acids. L. acidophilus, L. brevis, and P. acidilactici showed the most tolerance to the conjugated bile acids. P. acidilactici deconjugated glycocholic acid and glycodeoxycholate from 3.18 and 3.09 mM to the detection limits, respectively. The antibiotic susceptibility of selected foodborne pathogens was increased by increasing the concentration of deconjugated bile acids. The study results are useful for understanding the relationship between bile acid deconjugation by probiotic strains and antibiotic susceptibility in the presence of deconjugated bile acids, and they may be useful for designing new probiotic-antibiotic combination therapy based on bile acid deconjugation.</P>
He, Xinlong,Zou, Yunyun,Yoon, Won-Byong,Park, Sung-Jin,Park, Dong-Sik,Ahn, Juhee Elsevier 2011 Journal of bioscience and bioengineering Vol.112 No.2
<P><B>Abstract</B></P><P>This study was designed to evaluate the enhancement of antioxidant, antimicrobial, enzymatic, cytotoxic, and cognitive activities of <I>Codonopsis lanceolata</I> extracted by high pressure treatment followed by probiotic fermentation. Dried <I>C</I>. <I>lanceolata</I> samples were subjected to 400MPa for 20min and then fermented with <I>Bifidobacterium longum</I> B6 (HPE-BLF) and <I>Lactobacillus rhamnosus</I> (HPE-LRF) at 37°C for 7days. Compared to conventional extraction (CE-NF, 6.69mg GAE/g), the phenol amounts of HPE-BLF and HPE-LRF were significantly increased to more than 8mg GAE/g, while the lowest flavonoid contents were observed for HPE-BLF (0.44mg RE/mL) and HPE-LRF (0.45mg RE/mL) (<I>p</I><0.05). Cinnamic acid was the most abundant phenolic acid in the fermented <I>C</I>. <I>lanceolata</I>. The highest DPPH scavenging activities were observed for HPE-BLF and HPE-LRF, with minimum EC<SUB>50</SUB> values of 1.26 and 1.18mg/mL, respectively. The HPE-BLF and HPE-LRF samples exhibited the most noticeable antimicrobial activities against <I>Staphylococcus aureus</I>, <I>Listeria monocytogenes</I>, <I>Salmonella</I> Typhimurium, and <I>Shigella boydii</I> (MICs<15mg/mL). The fermented <I>C</I>. <I>lanceolata</I> samples effectively inhibited α-glucosidase and tyrosinase activities and potentially improved a scopolamine-induced memory deficit in mice. The application of a fermentation process can effectively improve the biological and pharmacological activities of high-pressure-extracted <I>C</I>. <I>lanceolata</I> by increasing the extraction efficacy and inducing probiotic conversion. The results suggest that the combined treatment of HPE and a fermentation process could be used as alternative extraction method over CE.</P>
LI Kunpeng,LIU Wei,LI Qunzhan,ZHAO Yunyun,HE Zhixin,SHI Haiou,JIN Shoujie,CHEN Guangzan 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The rational use of regenerative braking energy for urban rail transit trains directly affects the voltage safety of the traction power supply system and the electric braking function of the train. It is also of great significance for the implementation of train traction energy saving. This paper proposes a scheme of train regenerative braking ground absorbing device based on super-capacitor energy storage. It adopts multiple modular Buck/Boost DC conversion topology to realize bidirectional control of electric energy and stabilize the secondary utilization of traction network voltage and regenerative electric energy. According to the scheme of this paper, the energy storage device was developed and verified in the engineering of the Guangzhou Line 6 main line traction substation. The test indicators have met the design expectations.
Hu Hanmei,Ding Kangzhe,Yu Hong,He Yunyun,Yang Mingdi,오원춘 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
Novel metastable h-WO3 nano-hemitubes have been controllably prepared on a large scale assisted by inorganic structure directing agent of (NH4)2C2O4 through a convenient and facile hydrothermal route. The chemical composition, morphology, crystal structure, surface area and optical property of as-obtained products were investigated using various characterization techniques. Interestingly, it was found that the introduction and the adding amount of (NH4)2C2O4 played an important role in the process of controlling the phase and morphology of WO3. An appropriate amount of (NH4)2C2O4 (10–14 mmol) was beneficial for inducing the formation of metastable h-WO3 nano-hemitubes. However, monoclinic m-WO3 square-shaped nanoplates were obtained by adding 2 mmol (NH4)2C2O4. The results of photoluminescence (PL) test demonstrated that h-WO3 nano-hemitubes has a lower recombination rate of photogenerated electron–hole pairs and a longer lifetime of photogenerated carriers. Due to the special structure, the prepared one-dimensional h-WO3 nano-hemitubes displayed very superior adsorption–photocatalysis–oxidation activity for removing MB from highly concentrated MB-containing wastewater, which was 6.1 times higher than that of two-dimensional monoclinic m-WO3 square-shaped nanoplates. The mechanism of adsorption–photocatalysis–oxidation degradation for MB on h-WO3 nano-hemitubes was simply proposed. The prepared h-WO3 nano-hemitubes may have a potential application in wastewater purification and environmental remediation.
Ginsenoside Rg1 ameliorates Alzheimer's disease pathology via restoring mitophagy
Ni Wang,Junyan Yang,Ruijun Chen,Yunyun Liu,Shunjie Liu,Yining Pan,Qingfeng Lei,Yuzhou Wang,Lu He,Youqiang Song,Zhong Li The Korean Society of Ginseng 2023 Journal of Ginseng Research Vol.47 No.3
Background: Alzheimer's disease (AD) is a common form of dementia, and impaired mitophagy is a hallmark of AD. Mitophagy is mitochondrial-specific autophagy. Ginsenosides from Ginseng involve in autophagy in cancer. Ginsenoside Rg1 (Rg1 hereafter), a single compound of Ginseng, has neuroprotective effects on AD. However, few studies have reported whether Rg1 can ameliorate AD pathology by regulating mitophagy. Methods: Human SH-SY5Y cell and a 5XFAD mouse model were used to investigate the effects of Rg1. Rg1 (1µM) was added to β-amyloid oligomer (AβO)-induced or APPswe-overexpressed cell models for 24 hours. 5XFAD mouse models were intraperitoneally injected with Rg1 (10 mg/kg/d) for 30 days. Expression levels of mitophagy-related markers were analyzed by western blot and immunofluorescent staining. Cognitive function was assessed by Morris water maze. Mitophagic events were observed using transmission electron microscopy, western blot, and immunofluorescent staining from mouse hippocampus. The activation of the PINK1/Parkin pathway was examined using an immunoprecipitation assay. Results: Rg1 could restore mitophagy and ameliorate memory deficits in the AD cellular and/or mouse model through the PINK1-Parkin pathway. Moreover, Rg1 might induce microglial phagocytosis to reduce β-amyloid (Aβ) deposits in the hippocampus of AD mice. Conclusion: Our studies demonstrate the neuroprotective mechanism of ginsenoside Rg1 in AD models. Rg1 induces PINK-Parkin mediated mitophagy and ameliorates memory deficits in 5XFAD mouse models.