We extend Matveev’s complexity of 3-manifolds to PL compact manifolds of arbitrary dimension, and we study its properties. The complexity of a manifold is the minimum number of vertices in a simple spine. We study how this quantity changes under the most common topological operations (handle additions, finite coverings, drilling and surgery of spheres, products, connected sums) and its relation...

conclusions using -2.5 standard deviations as the cutoff for micropenis, a newborn infant in golestan province with a pl of < 23.3 mm had micropenis; however, more investigations are needed to clarify this issue. results means of pl and agd of 427 healthy term newborns were 32.1 ± 3.5 and 24.5 ± 2.5 mm, respectively. there was a positive correlation between pl and agd (r = 0.097, p = 0.046). ac...

background: mesenchymal stem cells (mscs) are multipotential cells and their therapeutic potency is under intense investigation. studying the effect of different induction factors on mscs could increase our knowledge about the differentiation potency of these cells. one of the most important sources of these factors in mammalian body is platelet. platelet lysate (pl) contains many growth factor...

The maize purple plant (pl) locus encodes a transcription factor required for anthocyanin pigment synthesis in vegetative and floral tissues. The strongly expressed Pl-Rhoades (Pl-Rh) allele is unstable, spontaneously changing to weaker expression states (Pl') at low frequencies and exclusively changing to Pl' in Pl'/Pl-Rh heterozygotes. The weakly expressed Pl' state is mitotically and meiotic...