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Selective Synthesis and Application to the Synthesis of (E)-Fluorovinyl Nucleosides
Shen, Qingbo,Hong, Joon Hee Taylor Francis 2008 Nucleosides, nucleotides & nucleic acids Vol.27 No.3
<P> A selective method for synthesizing (E)-fluorovinyl was developed. Novel acyclic (E)-fluorovinyl versions of neplanocin A were designed and selectively synthesized as potential antiviral agents. The condensation of the bromide 7 with the nucleosidic bases (5-FU, C, A, G) and the deprotection afforded the desired acyclic fluorovinyl nucleosides. The synthesized compounds 11, 12, 13, and 16 were evaluated for their antiviral activity. The guanine derivative 16 showed toxicity-dependent anti-HIV-1 activity in MT-4 cells.</P>
Preparation of Copper Nanoparticles Coated Cotton Fabrics with Durable Antibacterial Properties
Qingbo Xu,Xiating Ke,Naiqin Ge,Liwen Shen,Yanyan Zhang,Feiya Fu,Xiangdong Liu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
When copper nanoparticles (Cu NPs) were applied as an antimicrobial agent to finish cotton fabrics, there are two issues should be solved: the oxidization and the weak adsorbability onto cotton fiber surface. In the present work, we developed a new method that can achieve both immobilization and protection of the Cu NPs at the same time. As an effective binder, thioglycolic acid (TGA) was covalently linked to cotton fiber surface via an esterification with the hydroxyl groups of cellulose, then Cu NPs were introduced on the fabric surface in the presence of a protective reagent, citric acid. Due to the doubled stabilization acts of TGA and citric acid, the Cu NPs immobilized on the fabric surface showed an excellent antibacterial effect and outstanding laundering durability. Even after 50 consecutive laundering tests, the modified cotton fabrics still showed satisfactory antibacterial ability against both S. aureus and E. coli, which the bacterial reduction rates are all higher than 96 %. It is believed that this methodology has potential applications in a wide variety of textile productions such as sportswear, socks, and medical textiles.
THE LOCAL TIME OF THE LINEAR SELF-ATTRACTING DIFFUSION DRIVEN BY WEIGHTED FRACTIONAL BROWNIAN MOTION
Chen, Qin,Shen, Guangjun,Wang, Qingbo Korean Mathematical Society 2020 대한수학회보 Vol.57 No.3
In this paper, we introduce the linear self-attracting diffusion driven by a weighted fractional Brownian motion with weighting exponent a > -1 and Hurst index |b| < a + 1, 0 < b < 1, which is analogous to the linear fractional self-attracting diffusion. For the 1-dimensional process we study its convergence and the corresponding weighted local time. As a related problem, we also obtain the renormalized intersection local time exists in L<sup>2</sup> if max{a<sub>1</sub> + b<sub>1</sub>, a<sub>2</sub> + b<sub>2</sub>} < 0.
Panpan Duan,Qingbo Xu,Shuyang Shen,Yanyan Zhang,Lei Zhang,Feiya Fu,Xiangdong Liu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
We presented a one-pot approach for fabrication of antibacterial cotton fabric using an emulsion of silvernanoparticles (Ag NPs) protected by mercaptosuccinic acid (MSA). The emulsion was used to finish cotton fabrics via a paddry-cure process, making the MSA molecules covalently linked to the cotton fibers by ester linkages with the hydroxylgroups of cellulose. The coordination bonds between the MSA molecules and the Ag NPs provide stable and durable effecton the immobilization of the Ag NPs on the cotton fabric, endowing its antibacterial function with an outstanding launderingdurability. Even experienced 50 consecutive laundering tests, the modified cotton fabric exhibits satisfactory bacterialreduction rates against both Staphylococcus aureus and Escherichia coli. This paper provides a simple fabricationmethodology to mitigate the safety risk and environmental impact that are typically found in the antimicrobial cotton textilesbased on Ag NPs.
The local time of the linear self-attracting diffusion driven by weighted fractional Brownian motion
Qin Chen,Guangjun Shen,Qingbo Wang 대한수학회 2020 대한수학회보 Vol.57 No.3
In this paper, we introduce the linear self-attracting diffusion driven by a weighted fractional Brownian motion with weighting exponent $a>-1$ and Hurst index $|b|<a+1,0<b<1$, which is analogous to the linear fractional self-attracting diffusion. For the 1-dimensional process we study its convergence and the corresponding weighted local time. As a related problem, we also obtain the renormalized intersection local time exists in $L^2$ if $\text{max}\{a_1+b_1,a_2+b_2\}<0$.
Nanomemulsion of megestrol acetate for improved oral bioavailability and reduced food effect
Yixian Li,양수근,송정기,김민경,임효상,Qingbo Shen,이돈행 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.10
Megestrol acetate (MGA) belongs to the BCSclass II drugs with low solubility and high permeability,and its oral absorption in conventional dosage form MGAmicrocrystal suspension (MGA MS) is very limited andgreatly affected by food. In this study, MGA nanoemulsion(MGA NE) was formulated based on solubility, phasediagramand release studies. Then oral bioavailability ofMGA NE and MGA MS was evaluated. A randomizedtwo-way crossover trial was conducted on six male dogsunder fed and fasting conditions. Blood concentrations ofMGA were analyzed using LC–MS/MS. MGA NE yielded5.00-fold higher oral bioavailability in fasting conditionsand displayed more stable absorption profiles after foodintake compared with MGA MS.