Selecting and Identifying Lactic Acid Bacteria in Sourdough and Their Effect on Sourdough Physical and Chemical Properties

( Jing Han Huang ),( Syue Fong Lai ),( Wen Fu Wu ),( Chen Wei Huang ),( Ying Chen Lu ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

Sourdough is traditionally used as the leavening agent for bread making and a potential source of probiotics. In this study, sourdoughs from seven restaurants in Taiwan were collected. The lactic acid bacteria strains were isolated and identified by 16S rDNA sequencing from these sourdoughs. The following lactic acid bacteria species were identified: Lactobacillus pentosus, Lactobacillus paracasei, Lactobacillus casei, Lactobacillus plantarum, Lactobacillus sanfranciscensis. Five lactic acid bacteria strains, Lactobacillus paracasei LYC1242, Lactobacillus casei LYC1244, Lactobacillus plantarum LYC1245 and Lactobacillus casei LYC1246, were selected and singly used to ferment wheat flour. The pH value of various sourdoughs decreased to pH3 from pH5 and kelp at pH3. The titratable acidity and viscosity of various sourdoughs increased significantly compared to spontaneous fermented flour. However, there is no significant difference in titratable acidity between various sourdoughs. The sourdough fermented with L. casei LYC1244 had highest cell count. These studies provided preliminary results for choosing the best lactic acid bacteria starter strain to develop probiotic sourdough bread.

Experimental Studies of Low-Field Landau Quantization in Two-Dimensional Electron Systems in GaAs/AlGaAs Heterostructures

Jing-Han Chen,Chi-Te Liang,Chun-Feng Huang,Da-Ren Hang,David A. Ritchie,J. C. Hsiao,Jyun-Ying Lin,Michelle Y. Simmons,Ming-Gu Lin,S. H. Lo,Tsai-Yu Huang 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3

By applying a magnetic field perpendicular to GaAs/AlGaAs two-dimensional electron systems (2DESs), we study the low-field Landau quantization when the thermal damping is reduced with decreasing temperature. Magneto-oscillations following the Shubnikov-de Haas (SdH) formula are observed even when their amplitudes are so large that the deviation to such a formula is expected. Our experimental results show the importance of the positive magneto-resistance to the extension of the SdH formula under the damping induced by the disorder.

Design of Outriggers in a Tall Building Using Reinforced Concrete Deep Beams

Huang, Yi Tao(황일도),Jin, Hui Jing(김혜경),Kim, Han Soo(김한수) 한국콘크리트학회 2019 한국콘크리트학회 학술대회 논문집 Vol.31 No.1

β-Phase-Preferential Blow-spun Fabrics for Wearable Triboelectric Nanogenerators and Textile Interactive Interface

호동해,Jing Han,Jinrong Huang,Yoon Young Choi,Siuk Cheon,Jia Sun,Yanqiang Lei,Gyeong Seok Park,Zhong Lin Wang,Qijun Sun,조정호 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1

Wearable textile electronics have been extensively developed with versatile functionality and self-powered autonomy. The nonwoven fabric fabricated by solution blow spinning (SBS) was successfully applied as the triboelectric layer in TENGs. The uniaxial elongation of the polymer chains along the fiber axis during the SBS process promoted the formation of polar β-phase crystals in the solution-blow-spun nanofibers, which led to a negative shift in the surface potential and enhancement of the TENG performances. The constructed fabric TENG delivered excellent output performances such as a high open-circuit voltage of 260 V, short-circuit current of 27μA, and high output power of 7mW. The proposed β-phase-preferential blow-spun fabric TENGs are highly promising for application to next-generation intelligent textronics and self-powered human robot interaction interfaces.

Physicochemical, Antibacterial Properties, and Compatibility of ZnO-NP/Chitosan/β-Glycerophosphate Composite Hydrogels

( Pingping Huang ),( Wen Su ),( Rui Han ),( Hao Lin ),( Jing Yang ),( Libin Xu ),( Lei Ma ) 한국미생물생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.4

In this study we aimed to develop novel ZnO-NP/chitosan/β-glycerophosphate (ZnO-NP/CS/β-GP) antibacterial hydrogels for biomedical applications. According to the mass fraction ratio of ZnO-NPs to chitosan, mixtures of 1, 3, and 5% ZnO-NPs/CS/β-GP were prepared. Using the test-tube inversion method, scanning electron microscopy and Fourier-transform infrared spectroscopy, the influence of ZnO-NPs on gelation time, chemical composition, and cross-sectional microstructures were evaluated. Adding ZnO-NPs significantly improved the hydrogel's antibacterial activity as determined by bacteriostatic zone and colony counting. The hydrogel's bacteriostatic mechanism was investigated using live/dead fluorescent staining and scanning electron microscopy. In addition, crystal violet staining and MTT assay demonstrated that ZnO-NPs/CS/β-GP exhibited good antibacterial activity in inhibiting the formation of biofilms and eradicating existing biofilms. CCK-8 and live/dead cell staining methods revealed that the cell viability of gingival fibroblasts (L929) cocultured with hydrogel in each group was above 90% after 24, 48, and 72 h. These results suggest that ZnO-NPs improve the temperature sensitivity and bacteriostatic performance of chitosan/β-glycerophosphate (CS/β-GP), which could be injected into the periodontal pocket in solution form and quickly transformed into hydrogel adhesion on the gingiva, allowing for a straightforward and convenient procedure. In conclusion, ZnO-NP/CS/β-GP thermosensitive hydrogels could be expected to be utilized as adjuvant drugs for clinical prevention and treatment of peri-implant inflammation.

Charge transfer transition and energy transfer in Eu³⁺-doped Gd₁₀V₂O₂₀

Cheng, Han,Qin, Lin,Cai, Peiqing,Chen, Cuili,Wang, Jing,Il Kim, Sun,Huang, Yanlin,Seo, Hyo Jin Elsevier 2018 Journal of luminescence Vol.195 No.-

<P><B>Abstract</B></P> <P>Eu<SUP>3+</SUP>-doped Gd<SUB>10(1-<I>x</I>)</SUB>Eu<SUB>10<I>x</I> </SUB>V<SUB>2</SUB>O<SUB>20</SUB> (<I>x</I> = 0 – 1) phosphors were synthesized via the sol-gel process. The formation of a single phase compound was verified through the X-ray diffraction studies. Luminescence properties of Gd<SUB>10</SUB>V<SUB>2</SUB>O<SUB>20</SUB>:Eu<SUP>3+</SUP> are investigated by optical and laser excitation spectroscopy. The emission and excitation spectra, luminescence decays were measured in the temperature region 7–300K. The strong emission due to the vanadate group of Gd<SUB>10</SUB>V<SUB>2</SUB>O<SUB>20</SUB>:Eu<SUP>3+</SUP> is observed at low temperature. The charge transfer transition of Eu<SUP>3+</SUP> depends strongly on the Eu<SUP>3+</SUP>-concentration in Gd<SUB>10</SUB>V<SUB>2</SUB>O<SUB>20</SUB>:Eu<SUP>3+</SUP>. The emission intensity as a function of Eu<SUP>3+</SUP> concentration under excitation of charge transfer band is inconsistent with that of the 4<I>f</I> <SUP>7</SUP> states (the <SUP>5</SUP>L<SUB>6</SUB> state) of Eu<SUP>3+</SUP>. The energy transfer occurs between two Eu<SUP>3+</SUP> ions at low Eu<SUP>3+</SUP> concentration (< 10mol%), while energy diffusion dominates at high Eu<SUP>3+</SUP> concentration.</P>

Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

Qianqian Guo,Wen Jing,Shangzeng Cheng,Zhanggen Huang,Dekui Sun,Yaqin Hou,Xiaojin Han 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11

To determine the role of sulfur groups formed on activated carbon (AC) in the selective catalytic reduction (SCR) of NO with NH3, coal-based AC was modified by H2SO4 under various conditions and then treated in N2 atmosphere at 400 oC. The resulting carbons were characterized by N2 adsorption, elemental analysis, temperature programmed desorption and X-ray photoelectron spectroscopy, and tested for the SCR of NO with NH3 in the temperature range of 30-250 oC. Results reveal that H2SO4 modification has little effect on the textural properties, but promotes the formation of sulfur and oxygen groups. The sulfur groups incorporated by H2SO4 modification are mainly sulfonic groups and then sulfates. In particular, these sulfur groups play a predominant role in improving NH3 adsorption and then enhancing the SCR activity of modified carbons above 150 oC. However, the contribution of oxygen groups to NO reduction is very limited under the conditions employed in this work.

Agromyces laixinhei sp. nov. isolated from bat feces in China

Cheng Yanpeng,Bai Yibo,Huang Yuyuan,Yang Jing,Lu Shan,Jin Dong,Pu Ji,Zheng Han,Li Junqin,Huang Ying,Wang Suping,Xu Jianguo 한국미생물학회 2021 The journal of microbiology Vol.59 No.5

Three rod-shaped, Gram-stain-positive, and catalase-positive, phenotypically closely related isolates (HY052T, HY050, and HY045) were obtained from fecal samples collected from bats in Guangxi province and Chongqing city of China. Circular, smooth, light-yellow colonies appeared on brain heart infusion plate after 24–48 h incubation at 28°C. The optimal pH for growth was between 6.0 and 7.5. Based on 16S rRNA, the three isolates were phylogenetically related to Agromyces terreus DS-10T, Agromyces aureus AR33T, Agromyces salentinus 20-5T, Agromyces allii UMS-62T, Agromyces lapidis CD55T, and Agromyces italicus CD1T. Moreover, based on 296 core genes, the phylogenomic tree indicated that the three isolates clustered together, closest to Agromyces cerinus VKM Ac- 1340T and Agromyces fucosus VKM Ac-1345T but separated distantly from other Agromyces species. The average nucleotide identity values between strain HY052T and other Agromyces species ranged from 79.3% to 87.9%, lower than the 95–96% threshold. Furthermore, the genome of strain HY052T contains a circular chromosome of 3,437,203 bp with G + C content of 69.0 mol%. Main fatty acids were anteiso-C15:0 and anteiso-C17:0. The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, and unidentified glycolipids. Rhamnose, ribose, and glucose were the primary cell wall sugars. The major peptidoglycan amino acids included alanine, glutamic acid, glycine, and 2,4-diaminobutyric acid. An additional remarkable difference from other Agromyces species is that MK-12 was the sole menaquinone in strain HY052T. Based on results from the polyphasic characterizations performed in this study, our isolates are proposed to be members of a novel species in genus Agromyces, named Agromyces laixinhei. The type strain is HY052T (= CGMCC 1.17175T = JCM 33695T).

Patterns of Failure and Survival Trends in 3,808 Patients with Stage II Nasopharyngeal Carcinoma Diagnosed from 1990 to 2012: A Large-Scale Retrospective Cohort Study

Xue-Song Sun,Di-Han Liu,Sai-Lan Liu,Qiu-Yan Chen,Shan-Shan Guo,Yue-Feng Wen,Li-Ting Liu,Hao-Jun Xie,Qing-Nan Tang,Yu-Jing Liang,Xiao-Yun Li,Jin-Jie Yan,Ming-Huang Hong,Jun Ma,Lin-Quan Tang,Hai-Qiang M 대한암학회 2019 Cancer Research and Treatment Vol.51 No.4

Purpose The purpose of this study was to investigate the survival trends and patterns of failure in patients with stage II nasopharyngeal carcinoma (NPC) treated with radiotherapy (RT) and chemotherapy over the last 20 years. Materials and Methods Thirty-eight hundred and eight patients diagnosed with stage II NPC between January 1990 and December 2012 were involved in this retrospective cohort study. All patients were treated with RT. According to the main imaging techniques and RT technology, we categorized these patients into four calendar periods: 1990-1996, 1997-2002, 2003-2007, and 2008-2012. Overall survival (OS), progression-free survival (PFS), locoregional relapse-free survival (LRFS), and distant metastasis–free survival (DMFS) were served as the clinical outcome. Results After a median follow-up period of 84.7 months, we observed increasing trends in survival and disease control. The 3- and 5-year OS rates increased from 87.1% and 78.7% in the first calendar period to 97.4% and 94.5% in the last calendar period, respectively (p < 0.001). Additionally, significant increasing trends could be seen in the PFS and LRFS during the four calendar periods. In the subgroup analysis, the LRFS in patients older than 50 years at diagnosis showed greater improvement than younger patients. However, the rate of distant metastasis was stable and relatively low, as the 5-year DMFS ranged from 90.5% to 94.7% among the four calendar periods. Conclusion The survival rates in patients with stage II NPC showed increasing trends from 1990 to 2012. The advance of RT provided excellent locoregional control and enhanced OS.

Georgenia faecalis sp. nov. isolated from the faeces of Tibetan antelope

Wang Xiaoxia,Yang Jing,Huang Yuyuan,Wu Xiaomin,Wang Licheng,Han Limei,Li Sha,Li Huan,Fu Xiaoying,Chen Hai,Zhu Xiong 한국미생물학회 2020 The journal of microbiology Vol.58 No.9

Two aerobic, Gram-stain-positive, non-motile, non-sporulating coccoid strains, designated ZLJ0423T and ZLJ0321, were isolated from the faeces of Tibetan antelope (Pantholops hodgsonii). Their optimal temperature, NaCl concentration and pH for growth were 28°C, 0.5% (w/v) NaCl and pH 7.5, respectively. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strains ZLJ0423T and ZLJ0321 were very similar to each other (99.8%) and had a sequence similarity of 97.0% with Georgenia satyanarayanai NBRC 107612T and Georgenia subflava CGMCC 1.12782T. Phylogenomic analysis based on 688 core genes indicated that these strains formed a clade with G. satyanarayanai NBRC 107612T and Georgenia wutianyii Z294T. The predominant cellular fatty acids were anteiso-C15:0, anteiso-C15:1 A and C16:0. The major menaquinone was MK-8(H4). The cell-wall amino acids consisted of alanine, lysine, glycine and aspartic acid, with lysine as the diagnostic diamino acid. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannosides and two unidentified lipids formed the polar lipid profile. The DNA G + C content of both isolates was 73.9 mol%. The digital DNA–DNA hybridization value between strains ZLJ0423T and ZLJ0321 was 91.2%, but their values with closely related species and other available type strains of the genus Georgenia were lower than the 70% threshold. On the basis of polyphasic taxonomic data, strains ZLJ0423T and ZLJ0321 represent a novel species within the genus Georgenia, for which the name Georgenia faecalis sp. nov. is proposed. The type strain is ZLJ0423T (= CGMCC 1.13681T = JCM 33470T).