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Monosaccharides. In organic chemistry, Fehling's solution is a chemical reagent used to differentiate between water-soluble carbohydrate and ketone (>C=O) functional groups, and as a test for reducing sugars and non-reducing sugars, supplementary to the Tollens' reagent test. The test was developed by German chemist Hermann von Fehling in 1849.
These two guns were ready on their mounts in July and September 1883. The first firings took place in 1884, but the weapons were not fully operational until 1889 due to hydraulic system problems. The barrel on the gun at Napier cracked during firing trials; this was because the crew had managed to stress the gun by firing one shot every 2.5 ...
Preceded by. Sunset Park. 4 3 2 1 is a novel by Paul Auster published in January 2017. At the time of its publication, it was the first new Auster novel to have appeared in seven years. [1][2] Auster worked on the book seven days a week for three-and-a-half-years and wrote it in long hand. At 866 pages, the novel is much longer than any of his ...
A solid solution, a term popularly used for metals, is a homogeneous mixture of two different kinds of atoms in solid state and having a single crystal structure. [1] Many examples can be found in metallurgy, geology, and solid-state chemistry. The word "solution" is used to describe the intimate mixing of components at the atomic level and ...
Lawsone (2-hydroxy-1,4-naphthoquinone), also known as hennotannic acid, is a red-orange dye present in the leaves of the henna plant (Lawsonia inermis), for which it is named, as well as in the common walnut (Juglans regia) [5] and water hyacinth (Pontederia crassipes). [6] Humans have used henna extracts containing lawsone as hair and skin ...
A £1 million prize was won after 18 months by two Cambridge mathematicians. [12] By that time, 500,000 puzzles had been sold. Monckton launched the Eternity II puzzle in 2007, but, after the four-year prize period, no winner came forward to claim the $2 million prize. Monckton is a director of Resurrexi Pharmaceutical.
The Treaty on the Final Settlement with Respect to Germany (German: Vertrag über die abschließende Regelung in Bezug auf Deutschland[a]), more commonly referred to as the Two Plus Four Agreement (German: Zwei-plus-Vier-Vertrag[b]), is an international agreement that allowed the reunification of Germany in October 1990.
The active laser medium (also called a gain medium or lasing medium) is the source of optical gain within a laser. The gain results from the stimulated emission of photons through electronic or molecular transitions to a lower energy state from a higher energy state previously populated by a pump source. Examples of active laser media include: