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Zebra Co., Ltd. (ゼブラ株式会社, Zebura Kabushiki gaisha) is a Japanese manufacturer of writing instruments, established in 1914 by Tokumatsu Ishikawa. [1]The company sells a wide range of writing implements through retail stores, wholesalers and mail order.
Gel pens. Compared to other inks, gel ink has higher melting point viscosity, which supports a higher proportion of pigments in the medium.The pigments are typically copper phthalocyanine, carbon black and iron oxides, and the gel is made up of water and biopolymers, such as xanthan gum and tragacanth gum, as well as some types of polyacrylate thickeners.
In 1972, Binney & Smith introduced eight Crayola fluorescent crayons, designed to fluoresce under black light. The following year, they were added to the 72-count box, which had previously contained two of the eight most-used colors, in place of the duplicate crayons.
Agarose gel has large pore size and good gel strength, making it suitable as an anticonvection medium for the electrophoresis of DNA and large protein molecules. The pore size of a 1% gel has been estimated from 100 nm to 200–500 nm, [4] [5] and its gel strength allows gels as dilute as 0.15% to form a slab for gel electrophoresis. [6]
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