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Life Satisfaction, Occupation and Gender
SEULKI CHOI,KYUNG WON LIM 서울대학교 사회발전연구소 2020 Journal of Asian Sociology Vol.49 No.1
This study aims to understand the impacts of wages and occupational prestige on life satisfaction among wage workers by occupation and gender in South Korea using data from the Korea Labor and Income Panel Study (KLIPS) and analyzing it with a fixed effects ordered logit analysis. The results show that wage positively affects life satisfaction for both male and female workers but that it matters more for women. The effects are also different by occupation. Wage is more significant in the life satisfaction of male managers and clerks. Regarding prestige, it has no significant impact on the life satisfaction of male workers, but it affects female workers. By occupation, it matters more for managers, professionals, and semi-professionals but for clerks, it does not affect much among male employees. On the other hand, it dominates all occupations among female workers, so the differences in life satisfaction by occupation amongst women can be said to be mainly due to occupational prestige.
Physiological Characteristics and Anti-obesity Effect of Lactobacillus plantarum K10
Seulki Kim,Eunchong Huang,Soyoung Park,Wilhelm Holzapfel,Sang-Dong Lim 한국축산식품학회 2018 한국축산식품학회지 Vol.38 No.3
This study aimed to investigate the physiological characteristics and anti-obesity effects of Lactobacillus plantarum K10. The α-amylase inhibitory activity, α-glucosidase inhibitory activity, and lipase inhibitory activity of L. plantarum K10 was 94.66±4.34%, 99.78±0.12%, and 87.40±1.41%, respectively. Moreover, the strain inhibited the adipocyte differentiation of 3T3-L1 cells (32.61±8.32%) at a concentration of 100 μg/mL. In order to determine its potential for use as a probiotic, we investigated the physiological characteristics of L. plantarum K10. L. plantarum K10 was resistant to gentamycin, kanamycin, streptomycin, ampicillin, ciprofloxacin, tetracycline, vancomycin, and chloramphenicol. It also showed higher Leucine arylamidase, Valine arylamidase, and β-galactosidase activities. Moreover, it was comparatively tolerant to bile juice and acid, exhibiting resistance to Escherichia coli, Salmonella Typhimurium, Listeria monocytogenes, and Staphylococcus aureus with rates of 90.71%, 11.86%, 14.19%, and 23.08%, respectively. The strain did not produce biogenic amines and showed higher adhesion to HT-29 cells compared to L. rhamnosus GG. As a result of the animal study, L. plantarum K10 showed significantly lower body weight compared to the high-fat diet group. The administration of L. plantarum K10 resulted in a reduction of subcutaneous fat mass and mesenteric fat mass compared to the high-fat diet (HFD) group. L. plantarum K10 also showed improvement in gut permeability compared to the HFD positive control group. These results demonstrate that L. plantarum K10 has potential as a probiotic with antiobesity effects.
Seulki Kim,Sang-Dong Lim 한국축산식품학회 2020 한국축산식품학회지 Vol.40 No.1
In this study, we separated and purified lipase inhibitory peptide from fermented milk by Lactobacillus plantarum Q180 with the aim of developing a new functional anti-lipase activity yogurt product. L. plantarum 180 was inoculated into 10% reconstituted skimmed milk and incubated at 37℃ until the pH of the culture reached pH 4.4. The lipase activity was measured using porcine pancreatic lipase. The lipase inhibitory peptides were gradually isolated by ultrafiltration, reversed phase column chromatography (RPC), reversed phase high-performance liquid chromatography (RPHPLC), and gel permeation high-performance liquid chromatography (GP-HPLC) from the fermented milk by L. plantarum Q180. An ODS-AQ column was used for the RPC, a Vydac C18 column for the RP-HPLC, and a Superdex Peptide HR column for the GPHPLC. The peptide was composed of Asp, Thr, Ile, Ser, Ala, and Gln, and the anti-lipase activity (IC50) was 2,817 μg/mL.
Interfacial electron accumulation for efficient homo-junction perovskite solar cells
Song, Seulki,Moon, Byung Joon,Hö,rantner, Maximilian T.,Lim, Jongchul,Kang, Gyeongho,Park, Min,Kim, Jin Young,Snaith, Henry J.,Park, Taiho Elsevier 2016 Nano energy Vol.28 No.-
<P><B>Abstract</B></P> <P>Here we study perovskite solar cells based on mesoporous alumina scaffold infiltrated and capped with a perovskite absorber layer, which are devoid of a discrete n-type electron collection layer. We employ ethoxylated polyethylenimine (PEIE) to modify the interface between the perovskite absorber layer and the metallic transparent fluorine-doped SnO<SUB>2</SUB> (FTO) electrode. Surprisingly, the PEIE interlayer obviates the requirement for the conventional dense-TiO<SUB>2</SUB> (d-TiO<SUB>2</SUB>) compact layer (or organic fullerene layer), usually required to selectively extract electrons from the perovskite film. The self-organized PEIE interlayer produced a strong induced dipole moment at the perovskite-FTO interface, with our results indicating that electrons accumulate within the perovskite film at this interface. The resultant “n-type” contact region within the perovskite absorber layer, progressing to an intrinsic (i) region within the bulk of the perovskite layer, represents an n-i homojunction and favorably enables selective electron extraction at the FTO electrode. Resulting solar cells deliver current-voltage measured power conversion efficiencies (η) of over 15.0% and a substantial stabilized efficiency (η) of 9.1%. Although our solar cell performance remains lower than the highest reported efficiencies for perovskite solar cells employing discrete charge selective extraction layers, it indicates significant potential for “homo-junction” perovskite solar cells, once the metallic-to-perovskite contact is fully controlled. Additionally, our work identifies the potential impact of modifying the interface between the perovskite absorber and the subsequent contact materials with dipolar organic compounds, which may be applicable to optimizing contact at perovskite-semiconductor heterojunctions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-type less perovskite is proposed with stabilized power output efficiency. </LI> <LI> PEIE interlayer make an induced dipole at perovskite interface. </LI> <LI> Band bending of perovskite layer induces the charge accumulation. </LI> <LI> Perovskite solar cell have a permanent built-in potential which gives a stabilized maximum power output efficiency without n-type electron selective layer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>