. Cytology. Cytology. backward, the beam is converged on the specimen by the mirror block, and is diffracted to the photographic phite where it registers a pattern characteristic of the specimen. In X-ray diffraction, a narrow beam of X rays is passed through the object, some of the rays being scattered as the result of diffraction (or. I « ? ? ? « Figure 11-35. X-Ray Diffraction Pattern of Micro-crystalline Fibers of Lithium Salt of DNA in the /j configuration. (Courtesy of Dr. M. H. F. Wilkins, Biophysics Research Unit, King's College, London.) reflection) by the atoms of the object. The dif
. Cytology. Cytology. backward, the beam is converged on the specimen by the mirror block, and is diffracted to the photographic phite where it registers a pattern characteristic of the specimen. In X-ray diffraction, a narrow beam of X rays is passed through the object, some of the rays being scattered as the result of diffraction (or. I « ? ? ? « Figure 11-35. X-Ray Diffraction Pattern of Micro-crystalline Fibers of Lithium Salt of DNA in the /j configuration. (Courtesy of Dr. M. H. F. Wilkins, Biophysics Research Unit, King's College, London.) reflection) by the atoms of the object. The diffracted rays on emerging from the object travel in various directions depending on the angle at which they are diffracted. This pattern of diffraction is recorded by means of a photographic plate placed a short distance (5 to 10 mm) beyond the object. In the case of crystalline materials, the lattice struc- ture of the component crystals tends to concentrate the diffracted X rays in certain definite directions to produce a characteristic diffraction pat- 256 / CHAPTER 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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