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It consists of Cu + cations and acetylide anions − C≡C −, with the triple bond between the two carbon atoms. Although never characterized by X-ray crystallography, the material has been claimed at least since 1856. [2] One form is claimed to be a monohydrate with formula Cu 2 C 2 ·H 2 O. Copper(I) acetylide is a reddish-brown explosive ...
In chemistry, an acetylide is a compound that can be viewed as the result of replacing one or both hydrogen atoms of acetylene (ethyne) HC≡CH by metallic or other cations. Calcium carbide is an important industrial compound, which has long been used to produce acetylene for welding and illumination. It is also a major precursor to vinyl ...
The carbide product produced generally contains around 80% calcium carbide by weight. The carbide is crushed to produce small lumps that can range from a few mm up to 50 mm. The impurities are concentrated in the finer fractions. The CaC 2 content of the product is assayed by measuring the amount of acetylene produced on hydrolysis. As an ...
Later the liquid nitrogen refrigerator was invented by Union Carbide with money given to them by John Rockefeller Prentice, who used it exclusively for his bull stud before a number of years later giving it to the entire artificial insemination (A.I.) industry at no charge or royalty. Liquid nitrogen boils at −195.79 °C (77 K; −320 °F ...
This is a list of some of the cattle breeds considered in the United States to be wholly or partly of American origin. Some may have complex or obscure histories, so inclusion here does not necessarily imply that a breed is predominantly or exclusively American.
In 2012, a cattle breeding center was established in Nariyal village, Champawat, as part of an initiative to conserve and promote this indigenous breed, which has 137 Badri cows as of July 2016. [3] The Badri cow was officially recognized as an indigenous cattle breed by the Department of Agricultural Research in August 2016.
An American breeder, Richard Gradwohl, has developed eighteen different strains of miniature cattle. [3] Miniature Galloway, Hereford and Holstein have been bred. [2]: 245 [3] In the United States, small zebuine cattle deriving from stock imported from Brazil, the Dominican Republic and Sweden may be registered as "Miniature Zebu"; [2]: 245 in Australia, similar cattle may be known as "Nadudana".
Ponwar is an indigenous cattle breed of India. [1] It is known to be originated at Ponwar in Puranpur Taluk in Pilibhit district of Uttar Pradesh state and the breed is named after the same place. [2] The cattle is also restricted to the small geographic area [3] adjoining Ponwar. The cattle are known to be very active and are of fiery disposition.
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