INHERITED PECULIARITIES.

Pollen peculiarities

In flowering plants, male meiosis occurs in the microsporocyte to produce four microspores, each of which develops into a pollen grain. The image at top left is a transmission electron micrograph of a wild-type microspore from Arabidopsis thaliana, showing the single, central nucleus. The tetraspore (tes) mutant of Arabidopsis fails to undergo cytokinesis at the end of male meiosis and all four...

Peculiarities of Prion Diseases

Prion diseases (PrDs) are transmissible and fatal neurodegenerative diseases naturally occurring in humans and animals, ‘‘mad cow’’ disease being the most infamous. Their development and propagation requires endogenous prion protein (PrP) and derives from the conversion of PrP to a misfolded form, which combines with other misfolded PrP molecules to form small nuclei (seeds). The seeds can then...

Clinical peculiarities of tuberculosis

The ongoing spread of tuberculosis (TB) in poor resource countries and the recently increasing incidence in high resource countries lead to the need of updated knowledge for clinicians, particularly for pediatricians. The purpose of this article is to provide an overview on the most important peculiarities of TB in children. Children are less contagious than adults, but the risk of progression ...

Hydraulic fracturing and its peculiarities

Methods: A cohesive fracture model is adopted together with a discrete crack and without predetermined fracture path. The fracture is filled with interface elements which in the 2D case are quadrangular and triangular elements and in the 3D case are either tetrahedral or wedge elements. The Rankine criterion is used for fracture nucleation and advancement. In a 2D setting the fracture follows d...

Peculiarities of Paediatric Digestive Endoscopy