No abstract

The increasing young population of Iran and the subsequent increase in the unemployment rate in recent years make the government adopt temporary policies to solve the unemployment problem. Establishing private universities and increasing the capacity of university admissions in higher education are among these policies. Although these policies can reduce the youth unemployment problem temporarily, it leads to an influx of highly educated people in the labor market in the long term. Creating job opportunities for these young people will be more difficult, which requires the extensive cooperation of universities and higher education institutions to train student entrepreneurs. Hence, in this present study, the employment of university graduates is simulated through system dynamics approach. Then using the experimental design method, sensitivity analysis and optimization of variables are performed. In the following, identifying the variables influencing the employment of university graduates, scenarios are introduced regarding dynamic universities in youth employment.

Introduction: Tissue engineering by using decellularized tissues has been attracted attention of researchers in the regenerative medicine. Extra cellular matrix (ECM) is a secretory product of cells inside the tissues with supportive and regulatory function for homing cells. ECM contains glycosaminoglycans (GAGs) and fibrous proteins. Each particular tissue has its unique ECM, especially brain, because of its limited capacity for renovation, which is noticeable during aging and brain injuries. Recent studies reported that decellularized brain could provide necessary ECM for growth and survival of neurons. The main available decellularization techniques are based on physical, chemical and enzymatic approaches. Regarding the fragility of brain tissue, decellularization methods have been optimized to three methods: detergent, detergent enzymatic and physicochemical-enzymatic methods. Focusing on these methods, we performed this review to compare the efficacy and functionality of brain decellularization methods. Conclusion: The decellularized tissue of the brain contains a variety of glycoprotein components that can be used in the preparation of engineered scaffolds for the survival of nerve cells as well as in the preparation of brain organoids. Brain tissue decellularization has been much more successful with the methods that use the chemical solvents Triton X100, trypsin, and DNase in combination with freeze-thaw cycles and low-speed centrifuges.