104 / FIELDS OF INSTRUCTION

BTY 604-VEGETATION OF THE TROPICS. 4 credits
 Prerequisite: BTY 501. Tropical vegetation, principles of tropical ecology, and
 their relation to man.
 BTY 605-TROPICAL BIOLOGY: AN ECOLOGICAL APPROACH. 12 credits
 Identical with BLY 605 and ZY 605. Intensive field study of ecological concepts
 in tropical environments. Eight weeks in different principal kinds of tropical en.
 vironments. Offered Summer Quarter in Costa Rica as part of the program of the
 Organization for Tropical Studies.
 BTY 607-ADVANCED TROPICAL BOTANY. 12 credits
 Identical with BLY 607. Prerequisites: BTY 310; BTY 501 or BTY 542. Limit:
 10 participants. Offered Summer Quarter in Costa Rica as a part of the program
 of the Organization for Tropical Studies. Topics are changed each year.
 BTY 611-BIOCHEMISTRY OF TREES. 3 credits
 Identical with FY 621. Prerequisite: BCH 403. Metabolic processes and con-
 stituents associated with tree growth, reproduction, formation of wood, terpene, and
 other natural products. Formation of important forest tree chemicals.
 BTY 615-PLANT GROWTH AND DEVELOPMENT. 3 credits
 Prerequisite: BTY 515. Ways in which environmental factors influence plant
 growth and development.
 BTY 616-PLANT NUTRITION. 2 credits
 Prerequisite: BTY 515. Plant nutrition, including essentiality of elements, ab-
 sorption of ions, utilization and role of nutrients, redistribution of minerals in
 plants, and water metabolism.
 BTY 617-PLANT METABOLISM. 3 credits
 Prerequisites: BTY 515, BCH 402. Metabolism of carbohydrates, fats, and nitro-
 gen compounds in higher plants; cell structure as related to metabolism; metabolic
 control mechanisms.
 BTY 618-RADIATION AND PLANT GROWTH. 3 credits
 Prerequisite: BTY 515. Effects of radiant energy on the physiology of plants.
Generation, control and measurement of radiant energy; photosynthesis; photo-
tropism; photoperiodism; effect of the color of light; ionizing radiation.
BTY 621-ADVANCED MYCOLOGY 1. 4 credits
 Identical with PT 631. Prerequisite: BTY 521. First part of a three-course
sequence designed for students whose major or minor is mycology, botany, or plant
pathology. Morphology and taxonomy of fungi and identification of specimens.
Basidiomycetes and Fungi Imperfecti. Field work required.
BTY 622-ADVANCED MYCOLOGY 2. 4 credits
 Identical with PT 632. Prerequisite: BTY 621. Myxomycetes and phycomycetes.
Continuation of BTY 621.
BTY 623-ADVANCED MYCOLOGY 3. 4 credits
 Identical with PT 633. Prerequisite: BTY 622. Ascomycetes and lichens. Con-
tinuation of BTY 622.
BTY 624-FUNGAL GENETICS. 5 credits
 Comparative genetics of mating type and sexual development, chromosome
mapping, polyploidy, gene structure and function, and pathogenicity of selected
fungi.
BTY 625-FUNGAL PHYSIOLOGY. 5 credits
 Comparative physiology of growth, development, metabolism, and reproduction
of selected fungi.