Detail Nanotechnology’s invisible threat: small science, big consequences Bibliografi Author: Sass, Jennifer Topik: Nanotechnology; Nanomaterials Bahasa: (EN )    Edisi: May 2007     Penerbit: the Natural Resources Defense Council, Inc.     Tempat Terbit: New York    Tahun Terbit: 2007     Jenis: Papers/Makalah Fulltext: nano.pdf (160.4KB; 0 download) [Informasi yang berkaitan dengan koleksi ini di internet] Abstract Nanotechnologies are the engineered convergence of biology, chemistry, and informatics on a nanoscale— that is, involving materials measured in billionths of a meter. The products of these efforts are called nanomaterials, consisting of nanoparticles (having one or more dimensions of 1 to 100 nanometers) and the grouping of these particles into structures that may be larger than nanoscale. Nanoscale materials dissolve in different ways, take on different magnetic properties, react differently to chemicals, or reflect light differently from the way they would at normal size. The very qualities that make nanomaterials commercially desirable can also make them more toxic than their normal-size counterparts. Because they are so small—the head of a pin is about 1 million nanometers across—nanomaterials can be extremely mobile; they may pass easily into the bloodstream when inhaled or swallowed, and possibly when applied to the skin. Once inside the body, they seem to have access to most or all tissues and organs, including the brain. It is unknown whether nanomaterials can pass from a pregnant woman’s blood circulation to the fetal circulation, or through breast milk to a nursing infant. While the potential toxicity of intentionally engineered nanoscale materials is still being explored, studies on the health effects of unintentional nanoscale air pollutants are relevant. These data demonstrate that inhalation of nano-size chemical pollutants is associated with asthma attacks, heart disease, strokes, and respiratory disease. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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