Axial vessel widening in arborescent monocots

Axial vessel widening in arborescent monocots.

Dicotyledons have evolved a strategy to compensate for the increase in hydraulic resistance to water transport with height growth by widening xylem conduits downwards. In monocots, the accumulation of hydraulic resistance with height should be similar, but the absence of secondary growth represents a strong limitation for the maintenance of xylem hydraulic efficiency during ontogeny. The hydrau...

Vessel-widening by VEGF

A group of epithelial cells in the thymus guard against autoimmunity by presenting self-antigens to developing T cells—those T cells that take the bait are then killed. On page 1267, Rossi et al. identify the signaling pathway that creates this epithelial barrier and the cells that activate this pathway. Self-reactive T cells are eliminated when they latch on to selfantigens presented by a smal...

Project:  Batch Queuing System Arborescent  (BQS Arborescent) .

Dehn Surgery on Arborescent Links

Ying-Qing Wu Abstra t. This paper studies Dehn surgery on a large class of links, called arborescent links. It will be shown that if an arborescent link L is sufficiently complicated, in the sense that it is composed of at least 4 rational tangles T (pi/qi) with all qi > 2, and none of its length 2 tangles are of the form T (1/2q1, 1/2q2), then all complete surgeries on L produce Haken manifold...

CT of nasopharyngeal carcinoma: significance of widening of the preoccipital soft tissue on axial scans.

Axial CT scans of 60 patients with biopsy-proved nasopharyngeal carcinoma were reviewed with particular reference to sites of origin and routes of spread of disease. In all patients there was involvement of the pharyngeal space with blunting of the fossa of Rosenmuller and usually associated thickening of the adjacent levator veli palatini muscle. Tumor infiltration through the pharyngobasilar ...