A virus-specified mechanism for the prevention of multiple infection—T7- and T3-mutual and superinfection exclusion Monica Hirsch-KauffmannMei-li Pfennig-YehPeter Herrlich OriginalPaper Pages: 243 - 249
Isolation of mutants with altered pigments after irradiating haploid protoplasts from Datura innoxia Mill. with X-rays Otto Schieder OriginalPaper Pages: 251 - 254
A transcriptional barrier in the regulatory region of the tryptophan operon of Escherichia coli: Its role in the regulation of repressor-independent RNA synthesis Peter H. PouwelsHans Pannekoek OriginalPaper Pages: 255 - 265
Transient cycloheximide resistance in a tobacco cell line Pál MaligaGabriella LázárFerenc Nagy OriginalPaper Pages: 267 - 271
Hyper-recombination in dam mutants of Escherichia coli K-12 M. G. MarinusE. Bruce Konrad OriginalPaper Pages: 273 - 277
Biosynthetic regulation of individual proteins in relA + and relA strains of Escherichia coli during amino acid starvation Solvejg ReehSteen PedersenJames D. Friesen OriginalPaper Pages: 279 - 289
The effects of the relA gene on the synthesis of aminoacyl-tRNA synthetases and other transcription and translation proteins in Escherichia coli B Robert M. BlumenthalPeggy G. LemauxPatrick P. Dennis OriginalPaper Pages: 291 - 296
Isolation and characterization of temperature-sensitive mutants of Escherichia coli with altered ribosomal proteins Katsumi IsonoJohanna KraussYukinori Hirota OriginalPaper Pages: 297 - 302
A strain of Escherichia coli which gives rise to mutations in a large number of ribosomal proteins Eric R. DabbsH. G. Wittmann OriginalPaper Pages: 303 - 309
Transfer gene expression during fertility inhibition of the Escherichia coli K12 sex factor F by the I-like plasmid R62 Michael GassonNeil Willetts OriginalPaper Pages: 329 - 333
Effect of ultraviolet irradiation of bacteriophage f1 DNA on its conversion to replicative form by extracts of Escherichia coli Yukito Masamune OriginalPaper Pages: 335 - 345
Genetic and metabolic regulation of purine base transport in Neurospora crassa Te-Fang TsaoGeorge A. Marzluf OriginalPaper Pages: 347 - 355
Revertants of double Opal-mutants of bacteriophage T4 V. N. PozdnlakovA. N. Maisurian Short Communication Pages: 357 - 358