The mechanism behind the growth and development of tumors is intensively studied using several mathematical approaches that rely on linear and non-linear techniques to model the cell population dynamics to better understand the development and progression of cancer. In this paper, we study the progression of a type of malignant tumors characterized by the stem-differentiation hierarchy. Two mai...

background: previous studies have revealed significant differences between populations for genotypic frequencies of glutathione s-transferase t1 ( gstt1 ) and m1 ( gstm1 ) polymorphisms. in order to find the frequency of the null genotypes of gstm1 and gstt1 in iranian populations, the present study was carried out. methods: the total study subjects consisted of 1340 unrelated healthy muslims/i...

conclusions there are few studies on the prevalence of viral hepatitis in the general population of iran. most of the reports are from specific groups of patients. further epidemiologic studies on the general population of iran are recommended to discover the real burden of viral hepatitis. context viral hepatitis is still considered as a major health concern. defining the extent of the burden ...

In this paper we use a class of stochastic functional Kolmogorov-type model with jumps to describe the evolutions of population dynamics. By constructing a special Lyapunov function, we show that the stochastic functional differential equation associated with our model admits a unique global solution in the positive orthant, and, by the exponential martingale inequality with jumps, we dis...

objective: taurodontism is a dental anomaly characterized by elongation of root body and apical displacement of the pulp chamber floor associated with shortening of roots and their narrowing at the cementoenamel junction (cej). due to having a dilated apical one-third, these teeth may cause complications during extraction, locating canal orifices and instrumentation. this study aimed to assess ...

epilepsy is one of the common disorders in human community. clinical observations have shown that epileptic patients have often difficulty in learning and memory. kindling is a laboratory model for studying epilepsy and its complications. this experiment was designed to study the effect of chemical kindling on schaffer collateral-ca1 pyramidal cell synaptic transmission using pentylenetetrazole...

background chronic kidney disease (ckd) is an emerging worldwide epidemic but littledata concerning african populations are available. objectives we aimed to assess prevalence of ckd in adult populations of saint-louis, northern senegal. patients and methods in a population-based survey between january and may 2012, we included 1037 adults ≥ 18 years of age who resided in saint-louis. socio-dem...