Free Study Guide for Silent Spring by Rachel Carson - Book Summary

SILENT SPRING ANALYSIS

CHAPTER 13 - Through a Narrow Window

Summary

It’s necessary to look at the cells of the body in order to begin to see the effects of chemical poisons. In the 1960s, medical science had only just begun studying cells and cellular oxidation. Energy is produced not by organs but by cells. Cells transform matter into energy. The changes are made in an orderly process and each step is controlled by a specific enzyme. When energy is produced, so is waste given off. Most of the work of oxidation is performed in an even smaller arena than the cell. It is done by tiny granules within cells called Mitochondria. Mitochondria are tiny packets of enzymes, the enzymes necessary for the oxidation process.

The energy produced at each stage of oxidation within the Mitochondria is called ATP (adenosine triphosphate), a molecule containing three phosphate groups. ATP furnishes energy by transferring one of its phosphate groups to other substances. Once it has given up one of its phosphate groups, it is a diphosphate molecule, ADP. Then, in the next stage, another phosphate group is coupled on and the ATP is restored. ATP is found in all living organisms. The process in which ADP and a free phosphate group are combined to make a new ATP is coupled to the oxidative process. If the combination doesn’t happen or becomes uncoupled, there is lost energy. Respiration continues, but it produces nothing.

Uncoupling occurs with radiation. It can also be caused by chemical poisoning. Many chemicals discussed in the book act as uncouplers. Uncoupling is only one of the things that can go wrong. Enzymes can be destroyed, thereby brining the process of oxidation of cells to a halt. Many chemical poisons destroy enzymes. Scientists have shown that if they withhold oxygen, normal cells will transform into cancer cells. If the human embryo is deprived of oxygen, it will develop congenital deformities. There have been a rise of congenital defects, documented since the early 1960s. Scientists are also finding diminished reproduction. It has long been established that chemical poisons are present in the eggs of animals other than human beings. While it is.........

Notes

Chapter 13 is one of the most challenging chapters for the non-science-oriented reader. However, the difficulty is concentrated primarily in the first few pages of the chapter. Here, Carson sets up the terms and the description of process which will serve the reader well in understanding the rest........

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Silent Spring Study Guide - Free BookNotes Summary

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