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Amorphous germanium oxide nanobubbles for lithium-ion battery anode
Lim, Seh-Yoon,Jang, Wonseok,Yun, Soyeong,Yoon, Won-Sub,Choi, Jae-Young,Whang, Dongmok Elsevier 2019 Materials research bulletin Vol.110 No.-
<P><B>Abstract</B></P> <P>Germanium (Ge) is a promising anode material for lithium-ion batteries (LIBs) due to its large theoretical specific capacity (1600 mA h g<SUP>−1</SUP>), high Li diffusivity and large intrinsic electrical conductivity. Despite these merits, its large volumetric change during lithiation/delithiation process and relatively high production cost make it difficult to use in commercial batteries. In this paper, we report a facile, easy to scale up, and environmentally friendly method to prepare an amorphous phase GeO<SUB>x</SUB> (x < 1) hollow composite at a hydrothermal condition using an aqueous precursor solution containing GeO<SUB>2</SUB> particles, and citric acid. The citric acid induces gas bubble templates and frameworks to improve the structural strain for Li<SUP>+</SUP> ion conduction during cycling. The resulting GeO<SUB>x</SUB>-C hallow composite anode shows enhanced cyclability with a reversible capacity of 930 mA h g<SUP>−1</SUP> after 100 cycles at a current density of 0.3 C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> One-pot hydrothermal synthesis of the 3D bubble amorphous GeO<SUB>x</SUB> hollow composite. </LI> <LI> Control of the hollow shell thickness for optimized electrode performance. </LI> <LI> Bubble-templated nanoscale pores for effective accommodation of volume change during cycling process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
리놀레산에 의한 인체암세포의 성장 억제효과 및 암세포막 인지질 지방산 변화
임선영(Sun-Young Lim),이숙희(Sook-Hee Rhee),이세윤(Seh-Yoon Yi),박건영(Kun-Young Park) 한국식품영양과학회 1997 한국식품영양과학회지 Vol.26 No.4
MG-63 골육암세포 및 AZ-521 인체 위암세포 성장에 미치는 리놀레산(LA)의 성장 억제효과와 이때 암세포막의 인지질 유리지방산 조성 변화에 대한 연구를 하였다. LA 첨가 농도 0.005%에서 MG-63 암세포와 AZ-521 암세포는 대조군에 비해 각각 54% 및 52%의 암세포 성장이 억제되었다. 또한 LA 첨가(0.01%)시 이들 암세포의 [³H] thymindine 결합능은 90% 이상이 억제되어 암세포의 DNA합성이 크게 억제되었다. 한편 LA(0.005%) 첨가시 각 암세포의 형태학적인 변형을 유발시켰으며 세포막의 인지질 지방산 조성의 변화가 관찰되었다. LA처리는 이런 세포의 형태적 변형과 함께 세포막의 인지질 중 16 : 0과 18 : 0의 지방산은 현저히 감소되었으나 탄소수가 20 이상의 탄소수를 가지거나 불포화도가 높은 지방산(20 : 4, 22 : 6, 24 : 4)은 증가되었다. Linoleic acid(LA) was examined to evaluate its potential as a chemotherapeutic agent for MG-63 human osteosarcoma and AZ-521 gastric cancer cells. The treatment of LA(0.005% for 6 days) to the MG-63 and AZ-521 cancer cells inhibited growth of the cancer cells by 54% and 52%, respectively as compared to that of the controls. It also exhibited that LA with 0.01% concentration decreased the [³H] thymidine incorporation by more than 90% in the both cancer cells. In additions we observed morphological changes in MG-63 and AZ-521 cells under inverted microscope, and the changes in membrane fatty acid compositions of the cancer cells when LA was added at the level of 0.005%. The treatment with LA revealed that the contents of 16 : 0 and 18 : 0 decreased significantly, but fatty acids that C numbers are more than 20 and unsaturated(20 : 4, 22 : 6, and 24 : 4) increased, concomitantly the morphological changes of the cells were observed.
( Joung Ah Park ),( Gi Dae Kim ),( Jung Hoon Cha ),( Hye Lim Kim ),( Eun Suk Choi ),( Eun Sun Jung ),( Seung Kew Yoon ),( Seh Hoon Oh ),( Si Hyun Bae ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.4
Mesenchymal stem cells (MSCs) derived from various human tissues, including amnion (AM) from the placenta and bone marrow (BM), have been known to differentiate into multi-lineages and mesodermal cell lines. Few comparative studies have reported their potential for hepatogenic differentiation using an in vitro culture system and it remains unclear if their therapeutic potential in an animal model also depends on this differentiation. The pur-pose of this study was to compare the hepatogenic differentiation capacity of AM- and BM-derived MSCs, and toevaluate their antifibrotic efficacy after direct transplantation into a bile duct-ligated rat model of liver fibrosis. The proliferation of AM-MSCs derived from placenta was higher than that of BM-MSCs. Differentiated hepatocyte-like cells changed in morphology, expressed hepatocyte-specific genes, and demonstrated functional activities. Differ-entiated AM- and BM-derived hepatocyte-like cells were directly transplanted into rat livers suffering from hepaticfibrosis due to bile duct ligation. Liver tissues were analyzed at one and two weeks post-transplantation. Albumin expression was increased in rats one week after transplanting AM- and BM-derived hepatocyte-like cells. And, col-lagen deposition decreased compared with the control group. These results contribute to our understanding of the antifibrotic effects of AM- and BM-derived hepatocyte-like cells on liver disease and their ability to undergo hepato-genic differentiation. AM- and BM-derived MSCs may be a source of cells for liver regeneration and may providea foundation for the development of novel cell therapies.