Assignment Example | Topics and Well Written Essays - 250 words - 98

Assignment ExampleThis scenario may, however, break away to materialize.One of the factors that may lead to the failure of this mechanism is going of fluorescence. The exact origin of signal loss has not been established, but tentative explanations have been given. A mechanism that could explain this is the slow degradation of dig up ligands and coatings, when they atomic number 18 in body fluids (Gao, Cui and Levenson). This issue may be resolved by continuous optical maser excitation which corrects the surface defects.The process of imaging using CdSe quantum dots capped with ZnS may also fail payable to the rickety type used during imaging. The orange/red emitting QDs used are not optimized for tissue penetration. The QDs are also not optimized for imaging sensitiveness. The mechanism associated with failure in this manner is the lack of capability of plentiful tissue imaging by this kind of light. To prevent failure in this manner, it is advisable to use far-red and nea r-infrared light. This light should be in the spectral range of 650-900 nm. This wavelength is separated from the absorbing peaks of water and blood. For this reason, the tumor imaging sensitivity will be improved y at least tenfold (Gao, Cui and Levenson).Another factor that may cause the failure of this process is the noxious nature of CdSe QDs under extended periods of illumination by UV radiation. Radiation by UV dissolves the semiconductor particles causing the release of cadmium ions into the medium. Cadmium ions are toxic in nature. This may be avoided by the use of QDs with a stable polymer protection layer (Gao, Cui and Levenson). The stably protected QDs are non-toxic to cells they affect neither cell division, nor ATP production.Certain issues have to be turn to for the CdSe quantum dot-based cancer imaging to be successful. The researcher has to ask questions that include Is the mode of imaging economically executable basing on the