By Vasco Ronchi
Arguable booklet by way of world-renowned scientist provides a reoriented view of optics, bearing in mind the issues of subjective size. Drawing on features of physics, body structure and psychology, Dr. Ronchi discusses optical structures, acuity of imaginative and prescient, optical photo, parts of wave movement, and lots more and plenty extra. Translated by means of Edward Rosen. Bibliographical word. 106 black-and-white illustrations.
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Additional info for Optics, the science of vision
Morphology. Precise, overall surface measurements not given. Geographic Distribution. Reported as confined to temperate and cold regions of North America from Alaska to Florida. Bacterial Endosymbionts. None reported for this species. P. tetraurelia (4) Reference specimens: ATCC 30567 and ATCC 30568 (stocks d4-76 and 51E) Mating Reactions, Breeding Relations, and Inheritance of Mating Type. This species has a clonal system of mating type inheritance that seldom changes after fertilization except when conjugants exchange cytoplasm.
Their data and tables show that the distances between the sibling species are great, although, as noted earlier, P. primaurelia and P. pentaurelia were indistinguishable on the basis of the nine enzymes assayed. Using axenic cultures, similar results were obtained in the distribution of isozymes for the nine different enzymes in the P. aurelia complex of the 14 sibling species (S. L. Allen and Gibson, 1975). Since the food bacteria in a paramecium culture can contribute enzymes, the investigators emphasized the necessity of using axenically grown paramecia.
Primaurelia. Varia- Classification and Species 17 tions in chromosome number were also noted by Dippell (1954), and Sonneborn (1977a,b) reported that the chromosome number ranged from 30 to more than 60 pairs in different stocks of the same species in the P. aurelia complex. In his many detailed cytological studies of P. bursaria, Chen (1 940b) described the great variations of chromosome number appearing in different stocks of the species. As a morphological "marker," is the macronucleus of any systematic significance?