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Chenguang Liu,Wenwen Fan,Xiguang Chen,Chengsheng Liu,Xianghong Meng,Hyun Jin Park 한국물리학회 2007 Current Applied Physics Vol.7 No.s1
Linoleic-acid (LA) is covalently conjugated to carboxymethyl-chitosan via a 1-ethyl-3-(3-dimethylaminopropyyl)-carbodiimide-med-iated (EDC-mediated) reaction to generate self-aggregated chitosan nanoparticles by sonication. The average diameter of the particles isloading experiments indicate that the loading capacity and eciency increase with increasing concentration of ADR. ADR is slowlyreleased from chitosan self-aggregates for about 3 days. Furthermore, the eects of drug controlled release become more obvious onincreasing the pH value.
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Recent advancement of NGS technologies to detect active transposable elements in plants
Viswanathan Satheesh,Wenwen Fan,Jie Chu,Jungnam Cho 한국유전학회 2021 Genes & Genomics Vol.43 No.3
Background Unlike peoples’ belief that transposable elements (TEs) are “junk DNAs” or “genomic parasites”, TEs are essential genomic elements that bring about genetic diversity and enable evolution of a species. In fact, transposons are major constituent of chromosome in crop genomes, particularly in major cereal crops, the primary type of which is long terminal repeat (LTR) retrotransposon. Since TE mobilization can be controlled by specifc environmental stimulation and as the result can generate novel genetic variations, it has been suggested that controlled mobilization of TEs can be a plausible method for crop breeding. To achieve this goal, series of sequencing techniques have been recently established to identify TEs that are active in mobility. These methods target and detect extrachromosomal DNAs (ecDNAs), which are fnal products of integration. The newly identifed TEs by these methods exhibit strong transpositional activity which can generate novel genetic diversity and provide useful breeding resources. Conclusions In this mini review, we summarize and introduce ALE-seq, mobilome-seq, and VLP DNA-seq techniques employed to detect active TEs in plants.
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Fabrication of silica/PVA‑co‑PE nanofiber membrane for oil/water separation
Yuanli Chen,Hui Fan,Xinlin Zha,Wenwen Wang,Yi Wu,Yi Xiong,Kun Yan,Yuedan Wang,Dong Wang 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
High efficiency and anti-pollution oil/water separation membrane has been widely explored and researched. There are a large number of hydroxyl groups on the surface of silica, which has good wettability and can be used for oil-water separation membranes. Hydrophilic silica nanostructures with different morphologies were synthesized by changing templates and contents of trimethylbenzene (TMB). Here, silica nanospheres with radical pores, hollow silica nanospheres and worm-like silica nanotubes were separately sprayed on the PVA-co-PE nanofiber membrane (PM). The abundance of hydroxyl groups and porous structures on PM surfaces enabled the absorption of silica nanospheres through hydrogen bonds. Compared with different silica nanostructures, it was found that the silica/PM exhibited excellent super-hydrophilicity in air and underwater “oil-hating” properties. The PM was mass-produced in our lab through meltextrusion- phase-separation technique. Therefore, the obtained membranes not only have excellent underwater superoleophobicity but also have a low-cost production. The prepared silica/PM composites were used to separate n-hexane/water, silicone oil/ water and peanut oil water mixtures via filtration. As a result, they all exhibited efficient separation of oil/water mixture through gravity-driven filtration.
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Wang, Feige,Wu, Xue-Bing,Fan, Xiaohui,Yang, Jinyi,Cai, Zheng,Yi, Weimin,Zuo, Wenwen,Wang, Ran,McGreer, Ian D.,Ho, Luis C.,Kim, Minjin,Yang, Qian,Bian, Fuyan,Jiang, Linhua IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.807 No.1
<P>We report the discovery of an ultra-luminous quasar J030642.51+185315.8 (hereafter J0306+1853) at redshift 5.363, which hosts a supermassive black hole with M-BH = (1.07 +/- 0.27) x 10(10) M-circle dot. With an absolute magnitude M-1450 = -28.92 and a bolometric luminosity L-bol similar to 3.4 x 10(14) L-circle dot, J0306+1853 is one of the most luminous objects in the early universe. It is not likely to be a beamed source based on its small flux variability, low radio loudness, and normal broad emission lines. In addition, a z = 4.986 damped Ly alpha system (DLA) with [M/H] = -1.3 +/- 0.1, among the most metal-rich DLAs at z greater than or similar to 5, is detected in the absorption spectrum of this quasar. This ultra-luminous quasar puts strong constraints on the bright end of the quasar luminosity function and massive end of the black hole mass function. It will provide a unique laboratory for the study of BH growth and the co-evolution between a BH and the host galaxy with multi-wavelength follow-up observations. The future high-resolution spectra will give more insight into the DLA and other absorption systems along the line of sight of J0306+1853.</P>
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Yi, Wei-Min,Wang, Feige,Wu, Xue-Bing,Yang, Jinyi,Bai, Jin-Ming,Fan, Xiaohui,Brandt, William N.,Ho, Luis C.,Zuo, Wenwen,Kim, Minjin,Wang, Ran,Yang, Qian,Zhang, Ju-jia,Wang, Fang,Wang, Jian-Guo,Ai, Yanl IOP Publishing 2014 ASTROPHYSICAL JOURNAL LETTERS - Vol.795 No.2
<P>Very few of the z > 5 quasars discovered to date have been radio-loud, with radio-to-optical flux ratios (radio-loudness parameters) higher than 10. Here we report the discovery of an optically luminous radio-loud quasar, SDSS J013127.34-032100.1 (J0131-0321 in short), at z = 5.18 +/- 0.01 using the Lijiang 2.4 m and Magellan telescopes. J0131-0321 has a spectral energy distribution consistent with that of radio-loud quasars. With an i-band magnitude of 18.47 and a radio flux density of 33 mJy, its radio-loudness parameter is similar to 100. The optical and near-infrared spectra taken by Magellan enable us to estimate its bolometric luminosity to be L-bol similar to 1.1 x 10(48) erg s(-1), approximately 4.5 times greater than that of the most distant quasar known to date. The black hole mass of J0131-0321 is estimated to be 2.7 x 10(9) M-circle dot, with an uncertainty up to 0.4 dex. Detailed physical properties of this high-redshift, radio-loud, potentially super-Eddington quasar can be probed in the future with more dedicated and intensive follow-up observations using multi-wavelength facilities.</P>
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