Stealth technology

As described above, the circulation time of a particulate carrier in the blood can be prolonged using stealth technology to enhance particle hydrophilicity. If the circulation time is sufficiently prolonged and the particle size does not exceed, say, 0.2 urn, then accumulation at tumor and inflammation sites (EPR-effect) can be observed. 

Nevertheless, several general papers have been published on stealth technology applied to aircraft such as LOCKHEED F 117 [5,6] or others [7,8,9]. The description of radar absorbing materials is restricted to iron or ferrite loaded paints or elastomers except the case of retinyl Schiff base salts [10,11]. This molecule attracted interest of many scientists in 1987. In fact this material which is a charge transfer salt derived from the A vitamin, never exhibited high-frequency dielectric constant due to its intrinsic conductivity, despite its beautiful orange colour Moreover, reference books as the one of Knott el al. [12] do not mention the use of conductive polymers for this purpose. 

Stealth technologies are very complex due to the important number of involved scientific fields. Only the combination of materials improvement, numerical simulation and new stealth concepts can lead to improvements in this new science. 

The immune system has evolved so as to require only minute amounts of antigen for detection of a foreign invader. Herpesviruses have withstood the selective pressure exerted by the host through evasion of the host immune response and have had millions of years to bring these strategies to perfection. The fact that most, if not all, herpesviruses are capable of establishing persistent infections illustrates the effectiveness of the stealth technology employed by these viruses. 

Wiertz EJ, Mukherjee S, Ploegh HL (1997b) Viruses use stealth technology to escape from the host immune system. Mol Med Today 3 116-123... 

Mr. W. Bahret was with the United States Air Force but is now retired. From the early 1950s he sponsored numerous projects concerning radar cross section of airborne platforms—in particular, antennas and absorbers. Under his leadership grew many of the concepts used extensively today—for example, the metallic radome. In fact he is considered by many to be the father of stealth technology. 

Professor Whitesides selected the top down approach and asked, what are the current areas of importance One that used to be important, and is no longer, are national security issues. We are less concerned with dropping explosives on cities from ballistic trajectories, and there is less need for Ae wonderful "stealth" technology. The preeminent position of this concern has now been assumed by another concern, namely manufacturing, since the production of consumer goods is the plane at which nations now compete. Other problems that remain very much with us are health, information and communications, and environment. 

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