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Jia-An Zhang,Nian-Fa Yang,Li-Wen Yang,Shi Wu,Ye-Hui Chen,Jin Zhang 한국고분자학회 2013 Macromolecular Research Vol.21 No.6
Three new chiral bisacylphosphine oxides, (-)-bis(menthylformyl)phenylphosphine oxide (1a), (+)-bis(2,4,6-trimethylbenzoyl)menthylphosphine oxide (2a), and (-)-bis(menthylformyl)menthylphosphine oxide (3a),were synthesized using menthol as a chiral source. The synthesized new chiral bisacylphosphine oxides were used as photoinitiators for the polymerization of 1-phenyldibenzosuberyl methacrylate (PDBSMA). The polymerization initiated by chiral bisacylphosphine oxides under UV light irradiation is helix-sense-selective. Among the three prepared chiral bisacylphosphine oxides, the helix-sense-selectivity of bis(menthylformyl)menthylphosphine oxide is highest. The highest specific rotation of poly(1-phenyldibenzosuberyl methacrylate) at 365 nm is +416. The feed molar ratio of monomer to chiral bisacylphosphine oxide and the polymerization temperature have an influence on the helix-sense-selectivity. The lower the feed molar ratio of monomer to chiral bisacylphosphine oxide, the better the helix-sense-selectivity is. The increase of polymerization temperature is propitious to increase the helix-senseselectivity of the photopolymerization.
Metrological performance investigation of swirl flowmeter affected by vortex inflow
Qi Liu,Jia-hui Ye,Guang Zhang,Zhe Lin,Hong-guang Xu,Zu-chao Zhu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
In fluid transportation industries, long straight transition pipelines upstream of flowmeters are required to eliminate the influence of disturbed inflow on flow metering accuracy. To ensure an accurate flow measurement, the straight transition pipeline, which is often lengthy, can be shortened, particularly when the installation space is limited. However, the characteristics of disturbed flow (mainly characterized by vortex inflow) evolving along the straight transition pipeline to affect the metrological performance must be investigated for optimizing the pipeline length. The objective of this study was to investigate the metrological performance of a swirl flowmeter affected by the vortex inflow caused by flow regulation with a sleeve valve. The effect of a straight transition pipeline length upstream of a swirl flowmeter on the evolving characteristics of the vortex inflow was investigated experimentally and by conducting a numerical simulation under flow regulation parameters, including valve openings and flow velocities. The flow coefficients for different straight transition pipeline lengths were investigated to verify the flow simulation. The periodic pressure variation in the swirl flowmeter was monitored and its corresponding characteristic frequency was analyzed. It was found that the metrological characteristics of the swirl flowmeter were extremely affected by a smaller valve opening, which can be improved by lengthening the straight transition pipeline. By analyzing the velocity vector and vorticity in the internal flow field, the vortex inflow was found to be vulnerable to dissipation within a longer straight transition pipeline. The average vorticity at the cross-section of the entrance to the swirl flowmeter was adopted to evaluate the inflow vortex intensity. Additionally, a power curve model was established to assess the critical characteristic frequency determined by the maximum unaffected inflow vorticity for different straight transition pipeline lengths. This study can provide helpful insights to the metrological performance and pipeline arrangement in the field of fluid transportation engineering.
DNA methylation levels in different tissues in tea plant via an optimized HPLC method
Ying Gao,Jia-Li Hao,Zhen Wang,Kwan-Jeong Song,Jian-Hui Ye,Xin-Qiang Zheng,Yue-Rong Liang,Jian-Liang Lu 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.6
DNA methylation is one of the most important events in epigenetics and significantly influences plant growth and development. In the present study, we established and optimized a high-performance liquid chromatography method for detecting the base composition in DNA in tea plant (Camellia sinensis L.) tissues by using saline buffers-free mobile phases. The DNA methylation level varied with tea plant tissue, cultivar, and growth stage. A relatively higher DNA methylation level was observed in tender leaf (38.34%) and pistil (38.19%) tissues, while a relatively low level was detected in capillary root (19.45%), stamen (19.61%), and old leaf (20.70%) tissues. The pattern of the methylation level formed a saddle curve during the growth of dormant buds in spring; the lowest point appeared at the stage of one leaf and a bud. The methylation level in the adventitious buds regenerated from the branch after pruning seemed to decrease with an increase in the degree of pruning. These DNA methylation levels might be associated with the development of tea plant.
Chen Nan,Tan Jia-Yu,Wang Ying,Qi Ming-Hui,Peng Jiang-Nan,Chen De-Xin,Liu Su,Li Mao-Ye 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4
Heat shock proteins (HSPs) are encoded by Hsp genes and are important in insect tolerance to heat stress. The green peach aphid, Myzus persicae, is an important agricultural pest. The functions of Hsp genes in the thermal tolerance of M. persicae are unknown. This study identified an Hsp70 gene (MpHsp70a) and analyzed its role in protection against high-temperature stress. MpHsp70a encoded a protein consisting of 659 amino acid residues. The protein had three signature motifs of the HSP70 family and was predicted to be localized in the cytoplasm. The highest expression level of MpHsp70a was in adults, and differences in the mRNA levels between apterous and alate adults were not significant. Exposure to high temperatures (30, 35 and 40 ◦ C) for one hour and treatment with 40 ◦ C for different times (0.5, 1 and 2 h) all resulted in a greatly elevated expression level of MpHsp70a, suggesting that the gene is heat-inducible. The transcriptional level of MpHsp70a was suppressed by injection with double-stranded RNA (dsRNA), and knockdown of MpHsp70a significantly increased the suscep tibility of apterous adults to 40 ◦ C. These results indicate that MpHsp70a is required for tolerance to hightemperature stress in M. persicae. Our findings highlight the molecular mechanism underlying Hsp70-mediated thermal adaptation in M. persicae.
Application of Complex Probiotics in Swine Nutrition - A Review
Liu, Wen Chao,Ye, Mao,Liao, Jia Hao,Zhao, Zhi Hui,Kim, In Ho,An, Li Long De Gruyter Open 2018 Annals of animal science Vol.18 No.2
<P>The use of probiotics as alternatives to antibiotics for farm animals is gaining more and more interest during recent years. Probiotics are living microorganisms that provide a wide variety of health benefits to the host when ingested in adequate amounts. The bacterial strains most frequently used as probiotic agents are Bacillus, lactic acid bacteria, Enterococcus and Saccharomyces cerevisiae. It has been suggested that multi-strain probiotics might be more effective than mono-strain probiotics due to the additive and synergistic effects, and many previous studies demonstrated that dietary complex probiotics supplementation had growth promoting effects on pigs. However, the effect of complex probiotics in practice is not always consistent, the effect of probiotic could be affected by strain composition, dosage, feed formula, and the age of animals. In this review, we will give an overview on the current use of complex probiotics for weaning, growing and finishing pigs and sows.</P>
Identification of a Cancer Stem-like Population in the Lewis Lung Cancer Cell Line
Zhang, An-Mei,Fan, Ye,Yao, Quan,Ma, Hu,Lin, Sheng,Zhu, Cong-Hui,Wang, Xin-Xin,Liu, Jia,Zhu, Bo,Sun, Jian-Guo,Chen, Zheng-Tang Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3
Objective: Although various human cancer stem cells (CSCs) have been defined, their applications are restricted to immunocompromised models. Developing a novel CSC model which could be used in immunocompetent or transgenic mice is essential for further understanding of the biomolecular characteristics of tumor stem cells. Therefore, in this study, we analyzed murine lung cancer cells for the presence of CSCs. Methods: Side population (SP) cells were isolated by fluorescence activated cell sorting, followed by serum-free medium (SFM) culture, using Lewis lung carcinoma cell (LLC) line. The self-renewal, differentiated progeny, chemosensitivity, and tumorigenic properties in SP and non-SP cells were investigated through in vitro culture and in vivo serial transplantation. Differential expression profiles of stem cell markers were examined by RT-PCR. Results: The SP cell fraction comprised 1.1% of the total LLC population. SP cells were available to grow in SFM, and had significantly enhanced capacity for cell proliferation and colony formation. They were also more resistant to cisplatin in comparison to non-SP cells, and displayed increased tumorigenic ability. Moreover, SP cells showed higher mRNA expression of Oct-4, ABCG2, and CD44. Conclusion: We identified SP cells from a murine lung carcinoma, which possess well-known characteristics of CSCs. Our study established a useful model that should allow investigation of the biological features and pharmacosensitivity of lung CSCs, both in vitro and in syngeneic immunocompetent or transgenic/knockout mice.
Chen, Qiang,Luo, Zhao-Yun,Lin, Min,Lin, Qi-Li,Chen, Chan-Yu,Yang, Chun,Xie, Long-Xu,Li, Hui,Zheng, Jia-Kun,Yang, Li-Ye,Ju, Gui-Zhi Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4
Background: Human papillomavirus (HPV) infection is the main cause of cervical cancer. Limited epidemiologic data of HPV prevalence are available for women attending hospitals in southern China. This study aimed to evaluate the profiles of HPV infection and cytology status in gynecological outpatients in Chaozhou City. Methods: A total of 2833 eligible women were enrolled. The HPV GenoArray test was used for HPV detection and genotyping. Nearly one half of the HPV positive women received liquid-based cytology test. Logistic regression analysis was performed to assess the predictable effects of age and genotype for categories of abnormal cytology. Results: The prevalence of overall, high-risk, and low-risk HPV infection were 24.5%, 19.5% and 8.4%, respectively. A U-shaped age-specific prevalence curve was observed in overall HPV and high-risk HPV, but not in low-risk HPV, which declined with age increasing. The 6 most common high-risk HPV type in descending order, were types 52, 16, 58, 18, 68, and 33. Age and HPV genotype were both important determinants of abnormal cytology incidence, the older women (>45 years) and those infected with HPV type 16 and/or 18 having the highest risk for abnormal cytology. Conclusion: Our findings support the hypothesis that second-generation HPV prophylactic vaccines including HPV-52 and -58 may offer higher protection for women residing in Chaozhou and neighboring cities in Guangdong.