Tip leakage loss introduces major part of losses of the rotor in axial gas turbines. Therefore, the rotor blade tip has a considerable effect on rotor efficiency. To understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). Various blade tip configurations s...

Pollen tubes expand by tip growth and extend directionally toward the ovule to deliver sperms during pollination. They provide an excellent model system for the study of cell polarity control and tip growth, because they grow into uniformly shaped cylindrical cells in culture. Mechanisms underlying tip growth are poorly understood in pollen tubes. It has been demonstrated that ROP1, a pollen-sp...

Rationale: In developing blood vessels, single endothelial cells (ECs) specialize into tip cells that sense vascular endothelial growth factor (VEGF) and contribute to vessel sprouting and branch formation. Tip cell differentiation is inhibited through lateral Notch signaling between ECs, which is controlled by Notch ligands expressed in vessel sprouts. The contribution of the Notch ligand Delt...

RATIONALE In developing blood vessels, single endothelial cells (ECs) specialize into tip cells that sense vascular endothelial growth factor (VEGF) and contribute to vessel sprouting and branch formation. Tip cell differentiation is inhibited through lateral Notch signaling between ECs, which is controlled by Notch ligands expressed in vessel sprouts. The contribution of the Notch ligand Delta...

OBJECTIVE To evaluate the utility of endotracheal aspirate microscopy, culture and endotracheal tube tip culture for early diagnosis of ventilator-associated pneumonia in neonates. METHODS Inborn ventilated neonates were followed-up for ventilator-associated pneumonia using Center for Disease Control and Prevention (CDC) criteria. Endotracheal aspirate microscopy, culture and endotracheal tub...

In order to identify the endophytic fungi of stone fruit trees in West Azarbaijan province (Iran), healthy tissues were collected from various regions. For isolation of endophytic fungi, plant tissues were primarily washed with tap water, then surface sterilized by rinsing in 75% ethanol for 1 minute, followed by 5 minutes in 3% sodium hypochlorite (active ingredient). Disinfested pieces were t...

elimination of potyviruses from two commercial iranian garlic populations, hamedan and azar-shahr, through thermotherapy and by meristem tip culture were investigated. the infected bulbs of either one of the populations were initially treated at 30o c for one week and then at 36oc for 5 weeks. the meristems of cloves at two sizes of 0.4-0.6 mm and 0.6-0.8 mm were then cultured on ms medium supp...