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The Symposia, 1933 — 2003

1941:   Genes and Chromosomes: Structure and Organization, Vol. IX

Organizer: Milislav Demerec

Summary

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STRUCTURE OF CHROMOSOMES AS REVEALED BY OPTICAL METHODS
W ARMKE, H. E. Chromosome continuity and individuality    1
NEBEL, B. R. Structure of Tradescantia and Trillium chromosomes with particular emphasis on number of chromonemata    7
HUSKINS, C. L. The coiling of chromonemata    13
BERGER, C. A. Multiple chromosome complexes in animals and poly- somaty in plants    19
SALIVARY GLAND CHROMOSOMES
METZ, C. W. Structure of salivary gland chromosomes    23
MAZIA, DANIEL. Enzyme studies on chromosomes    40
PAINTER, THEOPHILUS S. An experimental study of salivary chromo-somes    47
SCHULTZ, JACK. The evidence of the nucleoprotein nature of the gene    55
COLE, PETER A. and SUTTON, EILEEN. The absorption of ultraviolet radiation by bands of the salivary gland chromosomes of Droso- phila melanogaster    66
SPONTANEOUS AND INDUCED CHANGES IN CHROMOSOME STRUCTURE
MCCLINTOCK, BARBARA. Spontaneous alterations in chromosome size and form in Zea mays    72
KAUFMANN, B. P. Induced chromosomal breaks in Drosophila    82
SAX, KARL. Types and frequencies of chromosomal aberrations induced by X-rays    93
CARLSON, J. GORDON. Effects of X-radiation on grasshopper chromosomes    104
FANO, U. On the analysis and interpretation of chromosomal changes in Drosophila    113
DELBRÃœCK, M. A theory of autocatalytic synthesis of polypeptides and its application to the problem of chromosome reproduction    122
MUTATIONS PLOUGH, H. H. Spontaneous mutability in Drosophila    127
RHOADES, M. M. The genetic control of mutability in maize    138
DEMEREC, M. Unstable genes in Drosophila    145
MULLER, H. J. Induced mutatlons in Drosophila    151
STADLER, L. J. The comparison of ultraviolet and X-ray effects on muta-tion    168
HOLLAENDER, ALEXANDER and EMMONS, C. W. Wavelength dependenceof mutation production in the ultraviolet with special emphasis on fungi    179
GOWEN, JOHN W. Mutation in Drosophila, bacteria and viruses    187

PHYSICAL ASPECTS AND TOOLS
ZWORYKIN, V. K. Image formation by electrons    194
FANKUCHEN, I. X-ray diffraction studies of protein preparations    198

PROPERTIES OF GIANT MOLECULES AS RELATED TOCHROMOSOME PROBLEMS
MARK, H. Structure and mechanical behavior of highpolymers    204
FRUTON, JOSEPH S. Proteolytic enzymes as specific agents in the forma- tion and breakdown of proteins    211
WRINCH, DOROTHY. The native protein theory of the structure of cyto-Plasm    218
GREENSTEIN, JESSE P. and JENRETTE, WENDELL V. Physical changes in thymonucleic acid induced by proteins, salts, tissue extracts, andultraviolet irradiation    236
STANLEY, W. M. and KNIGHT, C. A. The chemical composition of strains of tobacco mosaic virus    255
CLAUDE, ALBERT. Particulate components of cytoplasm    263
ROTHEN, ALEXANDRE, CHOW, BACON F., GREEP, R. O. and VAN DYKE, H. B. Specific properties of films of proteins    272
MIRSKY, ALFRED E. Some observations on protein folding and unfolding    278
RITTENBERG, D. The state of the proteins in animals as revealed by the use of isotopes    283

CONCLUSION
MULLER, H. J. Resume and perspectives of the Symposium on Genes and Chromosomes    290