RecQ helicase enhances homologous recombination in plants

AbstractRecQ helicase is a key component in the RecF pathway of Escherichia coli for initiation of homologous recombination. Here, we demonstrate that transient expression of RecQ gene in rice embryogenic cell increases the homologous recombination efficiency as much as 4-fold. Further experiments reveal that this effect is influenced by the RecQ dosage. Stable expression of RecQ in rice dramatically increases the homologous recombination events 20- to 40-fold in leaf tissue from different transgenic lines. This is the first evidence indicating that overexpression of RecQ gene can stimulate homologous recombination in plants

ANALYSIS OF PRACTICAL ABILITY IMPROVEMENT FOR TEACHERS BASED ON THE “EXCELLENCE PLAN”

The “excellence plan” is aimed at developing high quality engineering and technical talents who have a strong ability for innovation, can adapt to the development needs of society and can work out strategies for making the country stronger. At the same time, the “excellence plan” colleges are required to build a team which would include high level full-time and part-time teachers with engineering experience. This paper analyses the current situation of teachers’ ability for engineering practice and practical ability from the following points of view: bringing into play subjective initiative, interacting practical experience among teachers, adjusting the practical teaching link, training for teachers’ positions and training double-tutors with cooperation between schools and enterprises

Chiral selection and frequency response of spiral waves in reaction-diffusion systems under a chiral electric field

Chirality is one of the most fundamental properties of many physical, chemical and biological systems. However, the mechanisms underlying the onset and control of chiral symmetry are largely understudied. We investigate possibility of chirality control in a chemical excitable system (the BZ reaction) by application of a chiral (rotating) electric field using the Oregonator model. We find that unlike previous findings, we can achieve the chirality control not only in the field rotation direction, but also opposite to it, depending on the field rotation frequency. To unravel the mechanism, we further develop a comprehensive theory of frequency synchronization based on the response function approach. We find that this problem can be described by the Adler equation and show phase-locking phenomena, known as the Arnold tongue. Our theoretical predictions are in good quantitative agreement with the numerical simulations and provide a solid basis for chirality control in excitable media.Comment: 21 pages with 9 figures; update references; to appear in J. Chem. Phy

Phase-locked scroll waves defy turbulence induced by negative filament tension

Scroll waves in a three-dimensional media may develop into turbulence due to negative tension of the filament. Such negative tension-induced instability of scrollwaves has been observed in the Belousov-Zhabotinsky reaction systems. Here we propose a method to restabilize scroll wave turbulence caused by negative tension in three-dimensional chemical excitable media using a circularly polarized (rotating) external field. The stabilization mechanism is analyzed in terms of phase-locking caused by the external field, which makes the effective filament tension positive. The phase-locked scrollwaves that have positive tension and higher frequency defy the turbulence and finally restore order. A linear theory for the change of filament tension caused by a generic rotating external field is presented and its predictions closely agree with numerical simulations

EXPLORATION AND PRACTICE OF SCHOOL-ENTERPRISE COOPERATION IN PRACTICAL EDUCATION BASED ON “OUTSTANDING PROJECT”

There will be difficulties in moving forward the project for educating and cultivating outstanding engineers, therefore, based on the outstanding project, it’s crucial to come up with an efficient method to deal with the issues in the practice of school-enterprise cooperation engineering. This thesis is going to deliver the discussions in the following aspects: a. The forms and contents of how to build the school-enterprise cooperation practice; How do we conduct engineering practice; c. How do we make sure enough teachers and working places for engineering practice are provided; d. How do we guarantee the quality of engineering practice and build its related valuation system.&nbsp

Optimal View Angle in Collective Dynamics of Self-propelled Agents

We study a system of self-propelled agents in which each agent has a part of omnidirectional or panoramic view of its sensor disc, the field of vision of the agent in this case is only a sector of a disc bounded by two radii and the included arc. The inclination of these two radii is characterized as the view angle. Contrary to our intuition, we find that, the non-omnidirectional-view for swarm agents with periodic boundary conditions in noiseless Vicsek model can accelerate the transient process of the emergence of the ordered state. One consequent implication is that, there are generally superfluous communications in the Vicsek Model, which may even obstruct the possible fast swarm emergence. This phenomenon may invoke further efforts and attentions to explore the underlying mechanism of the emergence in self-propelled agents.Comment: 4 pages, 6 figure

Carboprost tromethamine prevents caesarean sectionassociated postpartum hemorrhage

Purpose: To investigate the effect of carboprost tromethamine on post-partum hemorrhage associated with caesarean section.Methods: One hundred patients with postpartum hemorrhage induced by cesarean section who were admitted to Binzhou People’s Hospital from October 2016 to August 2018 were selected. They were randomly assigned to two groups: control group and treatment group. Patients in the control group were administered oxytocin, while those in the treatment group received oxytocin in combination with carboprost tromethamine. The incidence of hemorrhage and adverse reactions were compared for the two groups.Results: The two groups showed gradually increasing degrees of postpartum hemorrhage within 24 h, but the treatment group had significantly lower volume of postpartum hemorrhage than the control group at different time points (p < 0.05). At the 1st, 3rd and 5th days after delivery, the height of the uterine fundus decreased gradually in the two groups, but was smaller in the treatment group than in the oxytocin group at all time points (p < 0.05). Total response in the treatment group was 98 %, which was significantly higher than 78 % in the control group (p < 0.05). The incidence of adverse reactions in the treatment group (12 %) was significantly lower than that in the control group (24 %, p < 0.05).Conclusion: Carboprost tromethamine prevents postpartum hemorrhage after cesarean section. It effectively reduces bleeding and promotes uterine involution, without obvious adverse reactions. Keywords: Carboprost tromethamine, Oxytocin, Cesarean section, Postpartum hemorrhag