1 ) , the stenosis was classified according to the Stanford classification [ 7 ] system into 4 types : ( i ) type I describes a partial obstruction of the SVC ( up to 90 % ) with remaining patency and antegrade perfusion of the azygos vein ; ( ii ) type II shows increasing obstruction ( 90-100 % ) ; ( iii ) type III is complete obstruction with ...
The tulip tree is a deciduous tree with a moderate to rapid growth rate. It has a tendency to produce a strong central leader that forms a tall, straight trunk. When young, this tree tends to have a canopy with an upright pyramidal growth habit, As it ages, the tree becomes columnar or more spreading and open.
The tulip poplar, (Magnoliaceae Liriodendron tulipifera,) was designated as the official state tree of Tennessee by Public Chapter 204 of the Acts of the 1947 General Assembly. The act stated that, as no state tree had ever before been designated, the adoption of an official tree seemed appropriate.