how to cite this article: zamani gh, shervin badv r, niksirat a, alizadeh h. cns structural anomalies in iranian children with global developmental delay. iran j child neurol. 2013 winter; 7 (1):25-28.   objective central nervous system (cns) malformations are one of the most important causes of global developmental delay (gdd) in children. about one percent of infants with gdd have an inherite...

What explains the resurgence of U.S. international competitiveness in the 1990s? The previous decade can be characterized as one of intense U.S. concern about its declining international competitiveness. In this article, we argue that U.S. industry adopted a new industrial paradigm called “Wintelism” in response to competitive pressures fromwesternEurope and East Asia. The essence of Wintelism ...

In animals that do not regulate their body temperature by the production of heat, the proportion of the total developmental time spent in a particular developmental stage does not change with temperature. In the quasi-linear region of the relationship between developmental rate and temperature, all of the developmental stages appear to have the same species-specific lower developmental threshol...

Phenotypic plasticity is the primitive character state for most if not all traits. Insofar as developmental and physiological processes obey the laws of chemistry and physics, they will be sensitive to such environmental variables as temperature, nutrient supply, ionic environment, and the availability of various macro- and micronutrients. Depending on the effect this phenotypic plasticity has ...

The paper deals with a reaction-diffusion problem that arises in developmental biology when describing the formation of the concentration profiles of signaling molecules, called morphogens, which control gene expression and, hence, cell differentiation. The mean local accumulation time, which is the mean time required to reach the steady state at a fixed point of a patterned tissue, is an impor...