Webพิวรีน. พิวรีน ( อังกฤษ: purine ) เป็น สารประกอบอินทรีย์ ประเภทเฮเตอโรไซคลิกและอะโรมาติก ที่มีวงแหวนไพริมิดีน (pyrimidine) เชื่อมกับวง ... WebHistory of Plastics. It was in 1862 that Alexander Parkes introduced the world’s first-ever man-made plastic, at the London International Exhibition. “Parkesine,” as it was called, …
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WebOrigin of polymers. Since ancient times, humans have used polymers, wool, for example. The word polymers comes from the union of two Greek words: polys (“many”) and meros … WebA polymer is a large molecule or a macromolecule which essentially is a combination of many subunits. The term polymer in Greek means ‘many parts’. Polymers can be found all around us. From the strand of our DNA, … rockbeare court farm
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A polymer is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics … See more Polymers are of two types: naturally occurring and synthetic or man made. Natural Natural polymeric materials such as hemp, shellac, amber, wool, silk, and natural rubber have been used for … See more Polymer properties depend of their structure and they are divided into classes according to their physical bases. Many physical and chemical properties describe how a polymer … See more There are multiple conventions for naming polymer substances. Many commonly used polymers, such as those found in consumer products, are referred to by a common or trivial name. The trivial name is assigned based on historical precedent or popular usage … See more Polymerization is the process of combining many small molecules known as monomers into a covalently bonded chain or network. During the polymerization process, some … See more The structure of a polymeric material can be described at different length scales, from the sub-nm length scale up to the macroscopic one. There is in fact a hierarchy of … See more Nowadays, synthetic polymers are used in almost all walks of life. Modern society would look very different without them. The spreading of polymer use is connected to their … See more Polymer characterization spans many techniques for determining the chemical composition, molecular weight distribution, and physical properties. Select common techniques include the following: • See more WebMonomers may have been able to spontaneously form polymers under the conditions found on early Earth. For instance, in the 1950s, biochemist Sidney Fox and his colleagues found … WebOrigins of life: first came evolutionary dynamics - Volume 4. ... Mutation, search and discovery of sequence → function polymers that create new molecular entities and mechanisms and (3) Selection, competition-driven upratcheting of fitness. Fig. 1 expresses these properties in the form of a machine-like, biosphere-wide nonequilibrium ... ostrich regular show