منابع مشابه
Spectrometry in the Analysis of High Purity Materials
Spark source mass spectrometry (SSMS) and atomic absorption spectrometry (AAS) have played important roles as powerful analytical tools. Both these techniques have undergone significant improvements since the late fifties in instrumentation and methodology leading to their application in various branches of science and te chnology. These techniques can be regarded as complementary techniques in...
متن کاملUltra-high resolution scanning electron microscopy of biological materials.
In recent years, several ultrahigh resolution scanning electron microscopes (SEM) were successively developed. They were all equipped with a field emission electron gun and an objective lens with a short focal length, and showed a resolution better than 1 nm. With such instrument, not only intracellular structures but also virus, bacteriophages, and biological macromolecules were clearly observ...
متن کاملHigh purity amphotericin B.
OBJECTIVES Amphotericin B (AmB) is a drug of choice for treatment of disseminated fungal infections, but its use is often associated with severe adverse effects. Our observation that generic formulations of AmB contain multiple polyene components led us to propose that removal of other polyenes would yield a high purity AmB (AmBHP) with an improved therapeutic index. METHODS To test that prem...
متن کاملUltra-strength materials
Recent experiments on nanostructured materials, such as nanoparticles, nanowires, nanotubes, nanopillars, thin films, and nanocrystals have revealed a host of ‘‘ultra-strength” phenomena, defined by stresses in a material component generally rising up to a significant fraction > 1 10 of its ideal strength – the highest achievable stress of a defect-free crystal at zero temperature. While conven...
متن کاملCatalytic enantioselective synthesis of chiral organic compounds of ultra-high purity of >99% ee
Shortly after the discovery of Zr-catalyzed carboalumination of alkynes in 1978, we sought expansion of the scope of this reaction so as to develop its alkene version for catalytic asymmetric C-C bond formation, namely the ZACA (Zr-catalyzed asymmetric carboalumination of alkenes). However, this seemingly easy task proved to be quite challenging. The ZACA reaction was finally discovered in 1995...
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ژورنال
عنوان ژورنال: DENKI-SEIKO[ELECTRIC FURNACE STEEL]
سال: 2006
ISSN: 0011-8389
DOI: 10.4262/denkiseiko.77.311