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Harkishan Singh (25 November 1928 – 20 March 2020) [1] was Professor Emeritus at the Panjab University (Chandigarh, India).He was a well recognized pharmaceutical academic, medicinal chemistry researcher and science historian.
Medicinal or pharmaceutical chemistry is a scientific discipline at the intersection of chemistry and pharmacy involved with designing and developing pharmaceutical drugs. Medicinal chemistry involves the identification, synthesis and development of new chemical entities suitable for therapeutic use.
Book of Optics (c. 1000) - Exerted great influence on Western science. [16] It was translated into Latin and it was used until the early 17th century. [ 17 ] The German physician Hermann von Helmholtz reproduced several theories of visual perception that were found in the first Book of Optics , which he cited and copied from.
The essence of glucosinolate chemistry is their ability to convert into an isothiocyanate (a "mustard oil") upon hydrolysis of the thioglucoside bond by the enzyme myrosinase. [4] The semisystematic naming of glucosinolates consists of the chemical name of the group "R" in the diagram followed by "glucosinolate", with or without a space.
Within the field of medicinal chemistry, the definition is often further restricted to secondary metabolites. [10] [11] Secondary metabolites (or specialized metabolites) are not essential for survival, but nevertheless provide organisms that produce them an evolutionary advantage. [12]
Between 3,000 [6] and 5,000 [7] species of medicinal plants grow in India with roughly 1,000 threatened with extinction. [7] Of these, more than 2,400 plant species have been documented for medicinal use. [2] [8] [9] Regions of India as described in Ethnobotany of India (2017), publication edited by T. Pullaiah, K.V. Krishnamurthy, & Bir ...
Silica gel was in existence as early as the 1640s as a scientific curiosity. [5] It was used in World War I for the adsorption of vapors and gases in gas mask canisters.The synthetic route for producing silica gel was patented in 1918 by Walter A. Patrick, a chemistry professor at Johns Hopkins University.
In some countries, such as Brazil (photo) and France, more than 20% of all drug sales in units are generic.. A generic drug is a pharmaceutical drug that contains the same chemical substance as a drug that was originally protected by chemical patents.