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- 저자 : Luxi Yang (검색결과 4 건)
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Jie Yang,Ying Huang,Yanru Feng,Hongmin Li,Ting Feng,Jinna Chen,Luxi Yin,Weihu Wang,Shulian Wang,Yueping Liu,Yongwen Song,Yexiong Li,Jing Jin,Wen Tan,Dongxin Lin 대한암학회 2019 Cancer Research and Treatment Vol.51 No.3
Purpose Mismatch repair (MMR) deficiency plays a critical role in rectal cancer. This study aimed to explore the associations between genetic variations in seven MMR genes and adverse events (AEs) and survival of patients with rectal cancer treated with postoperative chemoradiotherapy (CRT). Materials and Methods Fifty single nucleotide polymorphisms in seven MMR (MLH1, MLH3, MSH2, MSH3, MSH6, PMS1 and PMS2) genes were genotyped by Sequenom MassARRAY method in 365 patients with locally advanced rectal cancer receiving postoperative CRT. The associations between genotypes and AEs were measured by odds ratios and 95% confidence intervals (CIs) by unconditional logistic regression model. The associations between genetic variations and survival were computed by the hazard ratios and 95% CIs by Cox proportional regression model. Results The most common grade ! 2 AEs in those 365 patients, in decreasing order, were diarrhea (44.1%), leukopenia (29.6%), and dermatitis (18.9%). Except 38 cases missing, 61 patients (18.7%) died during the follow-up period. We found MSH3 rs12513549, rs33013, and rs6151627 significantly associated with the risk of grade ! 2 diarrhea. PMS1 rs1233255 had an impact on the occurrence of grade ! 2 dermatitis. Meanwhile, PMS1 rs4920657, rs5743030, and rs5743100 were associated with overall survival time of rectal cancer. Conclusion These results suggest that MSH3 and PMS1 polymorphisms may play important roles in AEs prediction and prognosis of rectal cancer patients receiving postoperative CRT, which can be potential genetic biomarkers for rectal cancer personalized treatment.
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Optimization of an indirect regeneration system for common bean (Phaseolus vulgaris L.)
Xiong Luxi,Liu Chang,Liu Dajun,Yan Zhishan,Yang Xiaoxu,Feng Guojun 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.6
The main problems associated with growing common bean (Phaseolus vulgaris L.) callus are low proliferation and differentiation, and high browning. In this study, common bean callus induced by cotyledon nodes was used as explant material to investigate the effects of different exogenous substances on callus regeneration, as well as the correlation between callus browning and the changes in superoxide dismutase (SOD), peroxidase (POD), and polyphenol oxidase (PPO) enzyme activities during callus culture. Adding AgNO3, CoCl2, Putrescine (Put), and 1-aminocyclopropane-1-carboxylic acid (ACC) to the callus growth medium at appropriate concentrations could significantly improve callus proliferation and differentiation efficiency, while also reducing the degree of browning, compared to controls. Callus explants were cultured in callus proliferation and differentiation medium (CPADM) containing 5 mg·L−1 AgNO3, 15 mg·L−1 Put, 5 mg·L−1 CoCl2, or 0.02 mM ACC, with optimal callus growth at these dosages. After treatment with the four exogenous substances, callus browning was inversely correlated with SOD activity but positively correlated with POD and PPO activities. The maximum rooting frequency of shoots was observed when rooting media was treated with 1 mg·L−1 Indole butyric acid (IBA) or 0.1 mg·L−1 2,4-dichlorophenoxyacetic acid (2,4-D). The average number of primary roots, root length, and root fresh weight were higher after these treatments. The indirect regeneration issue was largely resolved for common bean by the callus culture technique applied in this study, which provides a framework for genetic modification, germplasm preservation, and bean application.
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Approximate Closed-Form Energy Efficient PA for MIMO Relaying Systems in the High SNR Regime
Chunguo Li,Hyun Jong Yang,Fan Sun,Cioffi, John M.,Luxi Yang IEEE 2014 IEEE communications letters Vol.18 No.8
<P>Energy efficient power coefficients at the relay are derived in a closed-form expression for the green multi-input-multi-output relaying system in the high signal-to-noise ratio (SNR) regime, where the objective is to maximize the energy efficiency (EE), which is defined by the ratio of the spectral efficiency (SE) to total power consumption, with a minimum SE requirement under practical power consumption models. In particular, we derive closed-form solutions using the high SNR approximation, which turn out to be different from the water-filling solution. Simulation results show that the proposed solution nearly achieves the optimal EE in all SNR regimes.</P>
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Wang, Fang,Stedtfeld, Robert D.,Kim, Ok-Sun,Chai, Benli,Yang, Luxi,Stedtfeld, Tiffany M.,Hong, Soon Gyu,Kim, Dockyu,Lim, Hyoun Soo,Hashsham, Syed A.,Tiedje, James M.,Sul, Woo Jun American Chemical Society 2016 Environmental science & technology Vol.50 No.23
<P>Soil is an important environmental reservoir of antibiotic resistance genes (ARGs), which are increasingly recognized as environmental contaminants Methods to assess the risks associated with the acquisition or transfer of resistance mechanisms are still underdeveloped. Quantification of background levels of antibiotic resistance genes and what alters those is a first step in understanding our environmental resistome. Toward this goal, 62 samples were collected over 3 years from soils near the 30-year old Gondwana Research Station and for 4 years before and during development of the new Jang Bogo Research Station, both at Terra Nova Bay in Antarctica. These sites reflect limited and more extensive human impact, respectively. A qPCR array with 384 primer sets targeting antibiotic resistance genes and mobile genetic elements (MGEs) was used to detect and quantify these genes. A total of 73 ARGs and MGEs encompassing eight major antibiotic resistance gene categories were detected, but most at very low levels. Antarctic soil appeared to be a common reservoir for seven ARGs since they were present in most samples (42%-88%). If the seven widespread genes were removed, there was a correlation between the relative abundance of MGEs and ARGs, more typical of contaminated sites. There was a relationship between ARG content and distance from both research stations, with a significant effect at the Jang Bogo Station especially when excluding the seven widespread genes; however, the relative abundance of ARGs did not increase over the 4 year period. Silt, clay, total organic carbon, and SiO2 were the top edaphic factors that correlated with ARG abundance. Overall, this study identifies that human activity and certain soil characteristics correlate with antibiotic resistance genes in these oligotrophic Antarctic soils and provides a baseline of ARGs and MGEs for future comparisons.</P>
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