Introduction: High volumes of wastewater along with contaminants, such as colloids and dyes are discharged from different industries into the environment. These wastewaters create major problems and serious threats for water resources. Therefore, it is essential to treat such wastewaters and reach the effluent discharge standards. In this regard, chitosan as a coagulant has a comparable performance with other coagulants. Moreover, the addition of chitosan and removal of turbidity probably lead to higher efficiency of nanoparticles in lower dosages which is investigated in the current study. Therefore, the purpose of this study was to investigate the efficiency of chitosan and magnesium oxide (MgO) nanoparticles for the removal of color and turbidity. Materials & Methods: Synthetic wastewater was prepared by mixing specific amounts of bentonite and DIRECT blue 71 dye in distilled water. After the preparation of different concentrations of color and turbidity, the experiments were conducted with different dosages of chitosan and MgO separately and in combination. The influence of variables such as pH, initial concentration of dye and turbidity, MgO and chitosan dosages on removal efficiency was investigated in this study. Fidings: According to the results, the highest rate of color and turbidity removal was obtained at 1. 5 mg/L chitosan in combination with 1. 5 g/L MgO with the efficiency of 97. 5%. In addition, the highest removal efficiency was obtained at pH of 7. Discussion & Conclusions: Due to the need for high doses of MgO in high turbidities, the use of chitosan as a coagulant can be effective in reducing the use of MgO.

Introduction Human Papilloma Virus (HPV) is one of the most common sexually transmitted viruses and the main cause of urogenital tract cancers. Cervical cancer is the fourth common cause of cancer death in women and in more than 90% is associated with a persistent infection with one of the High-Risk HPV types. This study was performed with aim to determine HPV genotypes in DNAs extracted from tissue samples of people suspected to HPV infection. Methods In this cross-sectional epidemiological study, 201 tissue samples were obtained from people suspected to HPV infection that had referred to Dr. Mozaffari pathobiology laboratory for diagnosis in Tabriz from 2016-2019. Viral DNA was extracted using high pure viral nucleic acid extraction kit and genotyping was studied using HPV DIRECT Flow CHIP Kit. Data were analyzed by Excel software. Results Viral DNA amplification was observed in 45 samples (73%) and considered as HPV-positive. Among them, 8 samples (6%) were infected by high-risk types, 36 samples (34%) by both high & low-risk types and 56 samples (60%) by low-risk types. HPV types 6, 11 and 43 with frequency f 107, 23 and 10, respectively out of 145 people were identified as the most common low-risk types and HPV-18, 39 and 16 with frequency of 23, 11 and 10, respectively were identified as the common high-risk types. Most of the infected women were in the age range of 25-35 years and the age range for men was 35-40 years. Conclusion This study showed that determining the genotypes of HPV is considered as an important step in the management of HPV-infected people, especially people with persistent infection by High-risk types.

The largest class of algebraic hyper structures satisfying the module like axioms is the Hv-module. In this paper, we consider the category of Hv-modules and prove that the DIRECT limit always exists in this category. DIRECT limits are defined by a universal property, and so are unique. The most powerful tool in order to obtain a module from a given Hv-module is the quotient out procedure. To use this method we consider the fundamental equivalence relation ε * , and then prove some of the results about the connection between the fundamental modules, DIRECT systems and DIRECT limits.

Hepatitis C virus (HCV) infection is a major cause of chronic liver disease, with approximately 71 million chronically infected individuals worldwide. Clinical care for the patients with HCV-related liver disease has advanced considerably thanks to an enhanced understanding of the pathophysiology of the disease, and because of developments in diagnostic procedures and improvements in therapy and prevention, recently in Iran new drug DIRECT Acting agent (DAA) was developed that may be equivalent to original drugs that will hope to treat HCV and eliminated HCV in future

In this article, inspiring with a result due to O.A.S. Karamzadeh, we examine the $\prod_{i\in I} R_i/\oplus_{i\in I} R_i$, where $\{R_i\}_{i\in I}$ is an infinite family of rings. We observe that they are not self-injective on either side. In some important cases they are however $\aleph_0$-self-injective. Along this line, we study the interconnection between regularity(in the sense of von Neumann), injectivity and $\aleph_0$-injectivity.