الفهرس 
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Abstract
Nanotechnology is the science and technology related to the understanding and control of matter at the length scale of approximately 1 to 100 nanometers. A nanometer is one billionth of a meter. Nanomaterials are arrangements of matter in the length scale of approximately 1 to 100 nanometers that exhibit unique characteristics due to their size. Fabrication or the making of nanomaterials falls into one of two categories: top-down or bottom-up approach.
Nanomaterials may be inorganic as: fullerenes, carbon nanotubes, nanowires, semiconductor nanocrystals, dendrimers and nanoshells or organic as those fabricated from DNA and proteins.
Bio-inspired nanomaterials are divided into two categories: structurally inspired and functionally inspired.
Nanotechnology as any new technology has some implications as: health problems, environmental, economic and ethical implications.
Nanotechnology helps in medical diagnosis and provides nanoscale systems for imaging by loading them with contrast agents. They are also used as biosensors which produce concentration–proportional signals help in pathogenic diagnosis and environment monitoring.
Nanomedicine is delivery system in the nanometer size range (1 to 100 nm) containing encapsulated, dispersed, adsorbed or conjugated drugs to improve the pharmacokinetics and increase biodistribution of therapeutic agents to target organs and to decrease side effects of drugs.
Nanorobots are nanodevices with a diameter in the range of 1 to 100 nanometers. They provide remarkable possibilities in diagnosis, treating and preventing diseases. They include pharmacyte, respirocytes, microbivores, clottocytes and chromallocytes.
Gold nanoparticles are promising especially in cancer diagnosis and therapy.
Conclusion: Nanotechnology is a new technology which will improve all fields of life. Nanotechnology requires concerted efforts to maximize benefits and to reduce any unwanted side effects. Nanotechnology provides important tool for diagnosis and medical imaging. Nanomaterials may be used as biosensors for pathogenic diagnosis.
Nanomaterials can also be used as drug carriers.