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Chemist Warehouse Group (trading as Chemist Warehouse, Chemist Warehouse New Zealand, My Chemist, My Beauty Spot[ 3 ]) is an Australian company operating a chain of retail pharmacies both locally and internationally. The company is one of Australia's largest pharmacy retailers with over 500 stores in Australia, [ 4 ] and employs over 20,000 ...
Contents. Chemical weapons in World War I. A French gas attack on German trenches in Flanders, Belgium (1917). The use of toxic chemicals as weapons dates back thousands of years, but the first large-scale use of chemical weapons was during World War I. [ 1 ][ 2 ] They were primarily used to demoralize, injure, and kill entrenched defenders ...
Friedrich Wöhler. Friedrich Wöhler (German: [ˈvøːlɐ]) FRS (For) Hon FRSE (31 July 1800 – 23 September 1882) was a German chemist known for his work in both organic and inorganic chemistry, being the first to isolate the chemical elements beryllium and yttrium in pure metallic form. He was the first to prepare several inorganic compounds ...
The structure of the molecule of urea is O=C(−NH 2) 2.The urea molecule is planar when in a solid crystal because of sp 2 hybridization of the N orbitals. [8] [9] It is non-planar with C 2 symmetry when in the gas phase [10] or in aqueous solution, [9] with C–N–H and H–N–H bond angles that are intermediate between the trigonal planar angle of 120° and the tetrahedral angle of 109.5°.
c. 1900. Sir James Walker FRS [1] FRSE FCS LLD (6 April 1863 – 6 May 1935) was a Scottish chemist. [2] He worked mainly on inorganic and physical chemistry. His major contribution was in the study of chemical reaction kinetics based on a study of the reactions converting ammonium cyanate to urea which was published in 1895 along with Frederick J. Hambly (1878-1960).
In medicine, the urea-to-creatinine ratio (UCR[1]), known in the United States as BUN-to-creatinine ratio, is the ratio of the blood levels of urea (BUN) (mmol/L) and creatinine (Cr) (μmol/L). BUN only reflects the nitrogen content of urea (MW 28) and urea measurement reflects the whole of the molecule (MW 60), urea is just over twice BUN (60/ ...
William Cruickshank (born circa 1740 or 1750, [1] died 1810 or 1811 [2]) was a Scottish military surgeon and chemist, and professor of chemistry at the Royal Military Academy, Woolwich. [3] William Cruickshank was awarded a diploma by the Royal College of Surgeons of England on 5 October 1780. In March 1788 he became assistant to Adair Crawford ...
Urea plant using ammonium carbamate briquettes, Fixed Nitrogen Research Laboratory, ca. 1930 Carl Bosch, 1927. The Bosch–Meiser process is an industrial process, which was patented in 1922 [1] and named after its discoverers, the German chemists Carl Bosch and Wilhelm Meiser [2] for the large-scale manufacturing of urea, a valuable nitrogenous chemical.