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Huili Pang,Zhongfang Tan,Guangyong Qin,Yanping Wang,Zongwei Li,Qingsheng Jin,Yimin Cai 한국미생물학회 2012 The journal of microbiology Vol.50 No.1
A total of 140 lactic acid bacteria (LAB) strains were isolated from corn, alfalfa, clover, sainfoin, and Indian goosegrass in the Tibetan Plateau. According to phenotypic and chemotaxonomic characteristics, 16S rDNA sequence, and recA gene PCR amplification, these LAB isolates were identified as belonging to five genera and nine species. Corn contained more LAB species than other forage crops. Leuconostoc pseudomesenteroides, Lactococcus lactis subsp. lactis, Lactobacillus brevis, and Weissella paramesenteroides were dominant members of the LAB population on alfalfa, clover, sainfoin, and Indian goosegrass, respectively. The comprehensive 16S rDNA and recA-based approach effectively described the LAB community structure of the relatively abundant LAB species distributed on different forage crops. This is the first report describing the diversity and natural populations of LAB associated with Tibetan forage crops, and most isolates grow well at or below 10°C. The results will be valuable for the future design of appropriate inoculants for silage fermentation in this very cold area.
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Multi-functional transparent electrode for reliable flexible perovskite solar cells
Han, Gill Sang,Lee, Seongha,Duff, Matthew Lawrence,Qin, Fen,Jiang, Minlin,Li, Guangyong,Lee, Jung-Kun Elsevier 2019 Journal of Power Sources Vol.435 No.-
<P><B>Abstract</B></P> <P>Multilayer MoO<SUB>x</SUB>/Ag/MoO<SUB>x</SUB> (DMD) films are found to be transparent conducting electrodes for use in extremely stable and highly bendable flexible perovskite solar cells (PSCs). The optical transparency and electric properties of DMD and its role as a top electrode of PSCs were studied by changing the thickness of the MoO<SUB>x</SUB> layer. Although the MoO<SUB>x</SUB> thickness was shown to have a negligible effect on the sheet resistance of DMD, the transmittance of visible light, selective carrier transport capability, and long-term stability of a device considerably depend on this factor. The sandwich structure of a 20-nm-thick MoO<SUB>x</SUB>, 7-nm-thick Ag, and 20-nm-thick MoO<SUB>x</SUB> exhibits a high transmittance and large photon–electron conversion rate of PSCs. In addition, PSCs using the DMD top electrode maintain 92% of their initial current density after 24 h of continuous operation owing to a UV light cut-off of the top illumination. Moreover, the overall structure of DMD blocks the diffusion of water and oxygen molecules from real environmental conditions. At the same time, the underlying/upper MoO<SUB>x</SUB> layer retards the degradation through a chemical reaction between Ag and the halide ions inside the cells, as well as foreign ions from outside the polluted atmosphere. When DMD is applied to flexible PSCs on Ti foil, the PCE reaches 14.5%, and mechanical integrity of the PSCs is maintained at a bending radius of 4 mm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MoO<SUB>x</SUB>/Ag/MoO<SUB>x</SUB> multilayer is used as a top electrode of perovskite solar cells. </LI> <LI> The multilayer electrode has multiple functions in real operation environment. </LI> <LI> 92% of the initial current density is maintained after 24 h continuous operation. </LI> <LI> The efficiency of flexible solar cells using MoO<SUB>x</SUB>/Ag/MoO<SUB>x</SUB> reaches 14.5%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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