Biology
- #19. Following The Course Of An Enzyme-catalysed Reaction
Measurement of the rate of formation of the product or the rate of disappearance of the substrate. 1. Measurement of the rate of formation of O2 in the reaction: Mash up some biological material like potato tuber or celery stalks, mix them...
- #10.tests For Carbohydrates
Tests for Reducing sugars, Non-reducing sugar and Starch. 1. Reducing sugar (Benedict's test) All monosaccharides and most disaccharides (except sucrose) will reduce blue CuSO4(II), producing a precipitate of red Cu2O(I).Benedict?s...
- Lanthanum (la)
Term: lanthanum (La)Literally meaning: ?pertaining to hidden?Origin: ???????/lanthano(= to be hidden, to escape notice) .The element called lanthanum because it is ?hidden? in rare minerals. Coined/History Lanthanum was isolated in the mineral...
- Bromine (br)
Term: bromine (Br)Literally meaning: ?unpleasant odor?Origin: Anc Greek?????? ? ??????/vromos(=unpleasant odor)Coined/History Bromine discovered independently by German Carl Lowig (1803-1890) in 1825 from a mineral...
- Chlorine (cl)
Term: chlorine (Cl)Literally meaning: ??Origin: Anc Greek??????/cloros(=green-yellow)Coined/History Although sodium cloride was known since ancient times it was not until in 1630 when Belgian physician Jan Baptist van Helmont obtained...
Biology
iodine (I)
Term: iodine (I)
Literally meaning: ?pertaining to purple?
Origin: Anc Greek
???????/ioeides (=purple, violet) because of the color of elemental iodine vapor.
[<???. 'é???? < /é??= violete (flower)
Coined/History Iodine was discovered in 1811 by French chemist Bernard Courtois (1777-1838). The element was derived during Napoleonic wars (1804-1815), from saltpeter production which was used to make gunpowder. Courtois who made saltpeter from the ashes of seaweed, once added excessive sulfuric acid and a cloud of purple vapor rose which crystallized on cold surfaces forming dark crystalls. Courtois gave the samples to his friend Charles Bernard Desormes (1777-1862) and Nicolas Clement (1779-1841) who made public this discovery. He also gave some of the substance to chemist Joseph Louis Gay-Lussac (1778-1850) who suggested the name ?iodine?. Unfortunatelly, although Courtois continued to produce and sell iodine, he died in poverty.
In 1819 Jean-Baptiste Dumas proved that sponges used for many years to treat goiter contained iodine. In the mid-1800s, French agricultural chemist Jean Boussingault first suggested that iodine compounds might be able to cure goiter. Boussingault found iodine in the salts and suggested the cure, but it was not until 1896 that this treatment was confirmed. Ther Austrian psychiatrist Julius Wagner von Jaurreg (1857-1940) established that goiter could be prevented by taking iodine tablets regularly.
Definition
Iodine is a chemical element with atomic mass 126.90447 and atomic number 53. It is belongs to halogen group which also includs fluorine, chlorine, bromine and astatine. Most plants and animals requires iodine for a proper growth in small quantities. Main sources of iodine are fish and shellfish from the sea. Iodine is not found in nature as it is always combined with other elements. Pure iodine is poisonous.
- #19. Following The Course Of An Enzyme-catalysed Reaction
Measurement of the rate of formation of the product or the rate of disappearance of the substrate. 1. Measurement of the rate of formation of O2 in the reaction: Mash up some biological material like potato tuber or celery stalks, mix them...
- #10.tests For Carbohydrates
Tests for Reducing sugars, Non-reducing sugar and Starch. 1. Reducing sugar (Benedict's test) All monosaccharides and most disaccharides (except sucrose) will reduce blue CuSO4(II), producing a precipitate of red Cu2O(I).Benedict?s...
- Lanthanum (la)
Term: lanthanum (La)Literally meaning: ?pertaining to hidden?Origin: ???????/lanthano(= to be hidden, to escape notice) .The element called lanthanum because it is ?hidden? in rare minerals. Coined/History Lanthanum was isolated in the mineral...
- Bromine (br)
Term: bromine (Br)Literally meaning: ?unpleasant odor?Origin: Anc Greek?????? ? ??????/vromos(=unpleasant odor)Coined/History Bromine discovered independently by German Carl Lowig (1803-1890) in 1825 from a mineral...
- Chlorine (cl)
Term: chlorine (Cl)Literally meaning: ??Origin: Anc Greek??????/cloros(=green-yellow)Coined/History Although sodium cloride was known since ancient times it was not until in 1630 when Belgian physician Jan Baptist van Helmont obtained...