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Search Results: 1 - 10 of 4914 matches for " JinFeng Ni "
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Co-expression with RadA and the characterization of stRad55B, a RadA paralog from the hyperthermophilic crenarchaea Sulfolobus tokodaii
DuoHong Sheng,MingFeng Li,JianDong Jiao,JinFeng Ni,YuLong Shen
Science China Life Sciences , 2008, DOI: 10.1007/s11427-008-0008-x
Abstract: ST0838 (designed stRad55B) is one of the four RadA paralogs (or Rad55 homologues) in the genome of the hyperthermophilic crenarchaeon Sulfolobus tokodaii. The gene is induced by UV irradiation, suggesting that it is involved in DNA recombinational repair in this organism. However, this protein could not be expressed normally in vitro. In this study, thermostable and soluble stRad55B was obtained by co-expression with S. tokodaii RadA (stRadA) in E. coli, and the enzymatic properties were examined. It was found that stRad55B bound ssDNA preferentially and had a very weak ATPase activity that was not stimulated by DNA. The recombinant protein inhibited the strand exchange activity promoted by stRadA, indicating that stRad55B might be an inhibitor to the homologous recombination in this archaeon. The results will be helpful for further functional and interaction analysis of RadA paralogs and for the understanding of the mechanism of recombinational repair in archaea.
Chinese female nursing students’ coping strategies, self-esteem and related factors in different years of school
Chunping Ni,Daiwei Lo,Xiwen Liu,Jinfeng Ma
Journal of Nursing Education and Practice , 2012, DOI: 10.5430/jnep.v2n4p33
Abstract: Background: Recent research has emphasized the importance of coping. There is virtually nothing known about coping strategies and their relationship with self-esteem, individual and environmental factors among Chinese female nursing students. This study was to identify different coping strategies, the relationship between coping and self-esteem and influencing individual factors among Chinese female students in different years of nursing school. Method: The study used a cross-sectional design. A representative sample composed of 686 female nursing students aged 14 years or older was surveyed in December 2010 using the Simplified Coping Styles Questionnaire, the Self-Esteem Scale and the Personal Data Form for assessment. Results: Nursing students more often used positive rather than negative coping styles (P<0.001). There was significant difference in the positive coping between nursing students in different years of school (P=0.018). The positive coping style was significantly correlated to a higher level of self-esteem, good interpersonal relationships, enough free time for study alone, a sense of self-fulfillment and satisfaction, adaptation to new study methods, close friendships, help-seeking behavior of an individual, and physical health in the past year (P<0.05). The negative coping style was significantly associated with problems in romantic relationship, relationship with parents, worry about examinations and job assignment after graduation, feeling misunderstood, and frequent surfing on the internet (P<0.05). Conclusion: There were different coping strategies and the important relationship between self-esteem, individual and environmental factors and coping strategies among Chinese female nursing students in different years of school. The teaching strategies that promote the self-esteem and pay more attention to students’ individual and environmental factors will be useful for helping nursing students develop effective coping styles.
A New Proof for the Tight Range of Optimal Order Quantities for the Newsboy Problem with Mean and Standard Deviation  [PDF]
Jinfeng Yue
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.22023
Abstract: In the classical Newsboy problem, we provide a new proof for the tight range of optimal order quantities for the newsboy problem when only the mean and standard deviation of demand are available. The new proof is only based on the definition of the optimal solution therefore it is the most straightforward method. It is also shown that the classical Scarf’s rule is the mid-point of the range of optimal order quantities. This provides an additional understanding of Scarf’s order rule as a distribution free decision.
An Investigation on Safety Accidents in Outdoor Sports on the Perspective of Ethics in China  [PDF]
Jinfeng Chen
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.64010
Abstract:
With the rapid rise of outdoor sports in our country, the number of casualties increased dramatically. This article studies the moral issues behind the outdoor sports casualties in China from the perspective of ethics by using the literature data method and the investigation method. Starting from three perspectives: Individual participant, group participant and event organizer; this study looks for ethical issues in an accident, and discusses the causes. Furthermore, the author further analyzes the moral norms that our country outdoor sports should follow, and suggests that the following practices should be done to promote the harmonious developments of outdoor sports in China: 1) Strengthen moral education and the unity of knowledge and practice. 2) Improve self-discipline and improve personality. 3) Strengthen guidance of social public opinions, and value guidance. 4) Strengthen the moral evaluation and cultivation.
Preliminary Study on Campus Sports Culture Construction
—Taking Changzhou Liu Guojun Higher Vocational Technical School as an Example
 [PDF]

Jinfeng Chen
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.95055
Abstract: Through the practice research on the campus sports culture construction of Liu Guojun higher vocational technical school in Changzhou, it is found that there are many sports competitions in various forms in campus with wide participation. The construction of campus sports culture forms a new mode of sports culture construction in?higher vocational colleges?with sports competition as the carrier, competition promotion as the window and promotion connotation as the core. This article aims to build a harmonious campus and promote a harmonious society through the construction of campus sports culture by studying the case of Changzhou Liu Guojun higher vocational school campus sports culture construction.
Sulfolobus tokodaii RadA paralog, stRadC2, is involved in DNA recombination via interaction with RadA and Hjc
Lei Wang,DuoHong Sheng,WenYuan Han,Bin Huang,ShanShan Zhu,JinFeng Ni,Jia Li,YuLong Shen
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4292-0
Abstract: Rad51/RadA paralogs found in eukaryotes and euryarchaea play important roles during recombination and repair, and mutations in one of the human Rad51 paralogs, Rad51C, are associated with breast and ovarian cancers. The hyperthermophilic crenarchaeon Sulfolobus tokodaii encodes four putative RadA paralogs and studies on these proteins may assist in understanding the functions of human Rad51 paralogs. Here, we report the biochemical characterization of stRadC2, a S. tokodaii RadA paralog. Pull-down assays revealed that the protein was able to interact with the recombinase, RadA, and the Holliday junction endonuclease, Hjc. stRadC2 inhibited the strand exchange activity of RadA and facilitated Hjc-mediated Holliday junction DNA cleavage in vitro. RT-PCR analysis revealed that stRadC2 transcription was immediately reduced after UV irradiation, but was restored to normal levels at the late stages of DNA repair. Our results suggest that stRadC2 may act as an antirecombination factor in DNA recombinational repair in S. tokodaii.
Chaos in a Fractional-Order Single-Machine Infinite-Bus Power System and Its Adaptive Backstepping Control  [PDF]
Zhanhong Liang, Jinfeng Gao
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2016, DOI: 10.4236/ijmnta.2016.53013
Abstract: This paper has numerically studied the dynamical behaviors of a fractional-order single-machine infinite-bus (FOSMIB) power system. Periodic motions, period- doubling bifurcations and chaotic attractors are observed in the FOSMIB power system. The existence of chaotic behavior is affirmed by the positive largest Lyapunov exponent (LLE). Based on the fractional-order backstepping method, an adaptive controller is proposed to suppress chaos in the FOSMIB power system. Numerical simulation results demonstrate the validity of the proposed controller.
Improvement of the Cycle Performance of LiNi0.5Mn1.5O4 Cathode Active Materials by In-Situ Coating with Poly(3,4-Ethylenedioxythiophene)  [PDF]
Jinfeng Liu, Jing Xu
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.512005
Abstract:
LiNi0.5Mn1.5O4 (LNMO)/poly(3,4-ethylenedioxythiophene) (PEDOT) composite cathode materials were prepared through in-situ polymerization of thiophene monomer (EDOT), with ammonium persulphate (APS) as oxidizing agent, p-toluenesulfonic acid (PTSA) as dopant. The morphology, amount of PEDOT coating, electrochemical properties of LNMO/PEDOT were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and galvanostatic charge and discharge tests. The results show that the composite materials show better cycle performance than bare LNMO.
High-Dimensional Cox Regression Analysis in Genetic Studies with Censored Survival Outcomes
Jinfeng Xu
Journal of Probability and Statistics , 2012, DOI: 10.1155/2012/478680
Abstract: With the advancement of high-throughput technologies, nowadays high-dimensional genomic and proteomic data are easy to obtain and have become ever increasingly important in unveiling the complex etiology of many diseases. While relating a large number of factors to a survival outcome through the Cox relative risk model, various techniques have been proposed in the literature. We review some recently developed methods for such analysis. For high-dimensional variable selection in the Cox model with parametric relative risk, we consider the univariate shrinkage method (US) using the lasso penalty and the penalized partial likelihood method using the folded penalties (PPL). The penalization methods are not restricted to the finite-dimensional case. For the high-dimensional (→∞, ?) or ultrahigh-dimensional case (→∞, ?), both the sure independence screening (SIS) method and the extended Bayesian information criterion (EBIC) can be further incorporated into the penalization methods for variable selection. We also consider the penalization method for the Cox model with semiparametric relative risk, and the modified partial least squares method for the Cox model. The comparison of different methods is discussed and numerical examples are provided for the illustration. Finally, areas of further research are presented.
Non-perturbative Jet Quenching from Geometric Data
Jinfeng Liao
Physics , 2011, DOI: 10.1063/1.3700705
Abstract: This contribution discusses the geometric tomography by highly energetic jets penetrating the hot QCD matter in heavy ion collisions from RHIC to LHC energies. In particular the geometric data on the azimuthal anisotropy of high $p_t$ hadrons discriminate different models and strongly hint at energy loss mechanism beyond those based on perturbation theory. Taking together the RHIC and LHC data, the comparison with models is in favor of the model with strong enhancement of jet quenching in near-$T_c$ matter.
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