Turning back after engine failure during the take off phase of flight in a single engine aircraft is examined using a simplified analytical model. The important parameters are identified. The analysis shows that the optimum flight path is teardrop shaped with a 45◦ bank angle at stall velocity during the turn. The effects of engine failure altitude, wind direction and velocity, and bank angle o...

endritic cells present antigens during immune responses and are thought to be important in antitumor activity. However, under the influence of the known cancer promoter VEGF-A, dendritic cell precursors take on the trappings of endothelial cells and contribute to tumor blood vessels, speeding the cancer’s growth, according to a report by Jose Conejo-Garcia, Fabian Benencia, George Coukos (Unive...

A graph G represents a relation between pairs of items. The items are commonly called vertices and the set of vertices is denoted V (G). A relation is a pair of vertices {v1, v2}. Each relation is called an edge, and the set of all edges is denoted E(G). For example, G = K5 is the graph with 5 vertices, every pair of which are together in an edge. This is called the complete graph of order 5. G...

This specification defines an extension of Traversal Using Relays around NAT (TURN), a relay protocol for Network Address Translator (NAT) traversal. This extension allows a TURN client to request TCP allocations, and defines new requests and indications for the TURN server to open and accept TCP connections with the client's peers. TURN and this extension both purposefully restrict the ways in...

Microtubules turn over rapidly arc Kirschner recalls that the mid-1980s “was a very innovative time.” While the era was giving rise to stonewashed jeans and rap music, cell biology was entering new territory as it finally went molecular. For cell biologists who, like Kirschner, were interested in the cytoskeleton, there was an even more exciting possibility: the modification of interesting prot...

A few readers of my last two columns may have suspected that something was afoot. Well the explanation is quite simple. I wanted to set the record straight. After seven years of labour in the field, 84 columns, I go on to a well-deserved rest. I find it hard to believe, but there must be some graduate students who began reading me when they started research and who have got their PhDs by now. I...