Download e-book for kindle: A Random Walk in Science, by Robert L. Weber

By Robert L. Weber

ISBN-10: 085498027X

ISBN-13: 9780854980277

This anthology presents an perception into the wit and mind of the medical brain via a mix of a laugh and critical contributions written by means of and approximately scientists. The contributions list altering attitudes inside technology and reflect the interactions of technological know-how with society.

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Much of what is now called biochemistry dates from a discovery reported in 1828 by the German chemist Friedrich Wöhler, a contemporary and fellow countryman of Schleiden and Schwann. He revolutionized our thinking about biology and chemistry by demonstrating that urea, an organic compound of biological origin, could be synthesized in the laboratory from an inorganic starting material, ammonium cyanate. Until Wöhler reported his results, it had been widely held that living organisms were unique, not governed by the laws of chemistry and physics that apply to the nonliving world.

Especially important has been the development of techniques such as ultracentrifugation, The Emergence of Modern Cell Biology 3 (a) (b) (c) (d) (e) (f) (g) (h) (i) FIGURE 1-1 The Cells of the World. The diversity of cell types existing all around us includes (a) filamentous fungal cells; (b) Treponema bacteria; (c) a human red blood cell, a platelet, and a white blood cell (left to right); (d) a radiolarian; (e) Stentor (a protozoan); (f) human egg and sperm cells; (g) intestinal cells; (h) plant xylem cells; and (i) a retinal neuron.

Chromatographic techniques separate molecules based on their size, charge, or affinity for specific molecules or functional groups. An example of a chromatographic technique is shown in Figure 7-9. Electrophoresis refers to several related techniques that use an electrical field to separate molecules based on their mobility and is used extensively to determine the sizes of protein, DNA, and RNA molecules. The most common medium for electrophoretic separation of proteins and nucleic acids is a gel of either polyacrylamide or agarose.

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A Random Walk in Science, by Robert L. Weber

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