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Major Milestones in Biotechnology Over the Years

1977: The Age of biotechnology arrives with 'somatostatin' - a human growth hormone-releasing inhibitory factor, the first human protein manufactured in bacteria by Genentech, Inc. A synthetic, recombinant gene was used to clone a protein for the first time. 1978: Genentech, Inc. and The City of Hope National Medical Center announce the successful laboratory production of human insulin using recombinant DNA technology. Hutchinson and Edgell show it is possible to introduce specific mutations at specific si...

 


An Overview of the Characteristics of Silver

Silver, a chemical element, exists in the periodic table with the symbol "Ag" and atomic number 47. Silver is a soft white lustrous transition metal. Due to the fact that it has the highest electrical and thermal conductivity of any metal, silver is widely used throughout the world. It’s used in coins, jewelry, tableware, and photography, to name just a few examples. Silver occurs in minerals and in free form. If you look around your household you can find several objects that are made of polished ...

 


Properties of Sound

Sound in brief but remarkable terms is a vibration, that our ears perceive by the sense of hearing. Most commonly vibrations travel to our ears via the air. The ear then converts these sound waves into nerve impulses that are sent to our brains, where the impulses become sound. To say all that in a more technical language: Sound "is an alternation in pressure, particle displacement, or particle velocity propagated in an elastic material" (Olson 1957). Sound is also a series of mechanical compressions and ...

 




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