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Due to the irregular management, the effluent water of some waste water treatment plants (WWPT) of Liaoning province didn’t meet the demand of the National Discharge Standard. Meanwhile, excessive of dosage and discharge of sludge made the results of operation costs increasing and environmental pollution during the processes. The use of mathematical models for the simulationof wastewater treatment processes has gained widespread acceptance as a tool to aid the design of newworks and the optimization of existing facilities. STOAT developed by the Water Research Center is the most widely used model for simulating the WWST processes. This paper invited the STOAT as simulation model for the design and optimization of Liaoning waste water treatment plant.

Many anti-tumor drugs can induce tumor apoptosis by increasing intracellular ROS. In the present study, we build a model which did not directly cause DNA damage, but simulated damage products. The model of this injury was transferred into the cell so that the cell’s damage recognition mechanism mistakenly recognized that its own DNA was damaged, which in turn induced a response. Based on this model, the damaged plasmids (exogenous DNA damage) were transferred into the cells and the amount of reactive oxygen in the cells was improved, and DNA damage of the cells was increased. Therefore, exogenous DNA damage can affect the accumulation of damage in cells by affecting the level of reactive oxygen species, which provides a reference for DNA damage repair research.

DNA double-strand breaks (DSBs) are a major form of DNA damage, and its accurate repair is critical for maintaining genomic stability and preventing cancer. Repair of DSBs is mainly through two pathways, homology-directed DNA repair (HDR) and non-homologous end joining (NHEJ). Compared with NHEJ, HDR has higher fidelity, so the study of interrelated factors in homologous recombination pathway is of particularly important. In this paper, we constructed an I-SceI model controlled by a galactose promoter that produces a DSB or two adjacent DSBs on a single chromosome. Rad50 and Rad51 genes are further deleted in these models. Sensitivity experiments show that Rad51 stabilizes the ends of two adjacent DSBs in yeast. Deletion of Rad51 gene causes the sequence between two adjacent DSBs to drop out directly to form a large gap. If this gap is larger, the efficiency of NHEJ will be greatly reduced, resulting in the deaths of the strain. Our research shows that Rad51 stabilizes the ends of two adjacent DSBs in yeast.

Itraconazole is a common antifungal drug, which inhibiting lanosterol 14 alpha-demethylase, interfering with lanosterol convert to ergosterol or cholesterol, thereby affecting the synthesis of fungal cell membranes. In recent years, it has been found that it has anti-cancer effect and is expected to be used to treat a variety of human cancers. Colon cancer is a cancer disease that affects the health of contemporary people and its incidence tends to be younger. In this paper, the effects of itraconazole on proliferation and migration of Caco2 and HT-29 of two kinds of colon cancer cells were detected by MTT, scratch experiment and western blot. The data showed that itraconazole concomitant with increased drug concentration caused cell morphology of colon cancer significantly shrink. MTT experiment showed that it could reduce the survival rate of colon cells and western blot data indicated that it could down-regulation PCNA and MYL9 which are marker genes of proliferation and migration. Furthermore, the cell migration is reduced.