Table of Contents

Research Article

• You have access

  Molecular theory of the helix-coil transition in polyamino acids, I. Formulation

  N Go, M Go, and H A Scheraga

  PNAS April 1, 1968 59 (4) 1030-1037; https://doi.org/10.1073/pnas.59.4.1030
• You have access

  Electron spin resonance of a gamma-irradiated single crystal of 3'-cytidylic acid

  W Bernhard and W Snipes

  PNAS April 1, 1968 59 (4) 1038-1044; https://doi.org/10.1073/pnas.59.4.1038
• You have access

  Mössbauer studies on putidaredoxin

  R Cooke, J C Tsibris, P G Debrunner, R Tsai, I C Gunsalus, and H Frauenfelder

  PNAS April 1, 1968 59 (4) 1045-1052; https://doi.org/10.1073/pnas.59.4.1045
• You have access

  Reproductive structures and taxonomic affinities of some nannofossils from the gunflint iron formation

  G R Licari and P E Cloud Jr

  PNAS April 1, 1968 59 (4) 1053-1060; https://doi.org/10.1073/pnas.59.4.1053
• You have access

  Cellular differentiation in Volvox

  R C Starr

  PNAS April 1, 1968 59 (4) 1082-1088; https://doi.org/10.1073/pnas.59.4.1082
• You have access

  Lipid abnormalities in a variant of the Hurler syndrome

  R Matalon, J A Cifonelli, H Zellweger, and A Dormanfman

  PNAS April 1, 1968 59 (4) 1097-1102; https://doi.org/10.1073/pnas.59.4.1097
• You have access

  Further characterization of L-cell virions

  D A Kindig, R Karp, and W H Kirsten

  PNAS April 1, 1968 59 (4) 1103-1109; https://doi.org/10.1073/pnas.59.4.1103
• You have access

  The synthesis of collagen and protocollagen hydroxylase by fibroblastic and nonfibroblastic cell lines

  B Goldberg and H Green

  PNAS April 1, 1968 59 (4) 1110-1115; https://doi.org/10.1073/pnas.59.4.1110
• You have access

  Effects of DNA repair in transformation-heterozygotes of pneumococcus

  F Guerrini and M S Fox

  PNAS April 1, 1968 59 (4) 1116-1123; https://doi.org/10.1073/pnas.59.4.1116
• You have access

  Nonoperative DNA complementary to ribosomal RNA

  F M Ritossa

  PNAS April 1, 1968 59 (4) 1124-1131; https://doi.org/10.1073/pnas.59.4.1124
• You have access

  Loss of T-antigen from somatic hybrids between mouse cells and SV40-transformed human cells

  M C Weiss, B Ephrussi, and L J Scaletta

  PNAS April 1, 1968 59 (4) 1132-1135; https://doi.org/10.1073/pnas.59.4.1132
• You have access

  A membranelike fraction from Neurospora crassa, I. Structure of "membranes" and release of free amino acids

  A Bergquist, E A Eakin, B V Winkel, and R P Wagner

  PNAS April 1, 1968 59 (4) 1136-1143; https://doi.org/10.1073/pnas.59.4.1136
• You have access

  The loss of phenotypic traits by differentiated cells, V. The effect of 5-bromodeoxyuridine on cloned chondrocytes

  J Abbott and H Holtzer

  PNAS April 1, 1968 59 (4) 1144-1151; https://doi.org/10.1073/pnas.59.4.1144
• You have access

  Bacterial conjugation: electron microscope observations on thin sections

  W H Schreil and R J Christensen

  PNAS April 1, 1968 59 (4) 1152-1157; https://doi.org/10.1073/pnas.59.4.1152
• You have access

  Viral DNA in polyoma- and SV40-transformed cell lines

  H Westphal and R Dulbecco

  PNAS April 1, 1968 59 (4) 1158-1165; https://doi.org/10.1073/pnas.59.4.1158
• You have access

  Interspecific transplantation as a tool for indicating phylogenetic relationships

  M P Kambysellis

  PNAS April 1, 1968 59 (4) 1166-1172; https://doi.org/10.1073/pnas.59.4.1166
• You have access

  Effect of bretylium and guanethidine on transmission to sweat glands in the cat

  D P Lloyd

  PNAS April 1, 1968 59 (4) 1173-1178; https://doi.org/10.1073/pnas.59.4.1173
• You have access

  Stimulation of the carotid chemoreceptors of the dog by dopamine

  L Jacobs and J H Comroe Jr

  PNAS April 1, 1968 59 (4) 1187-1193; https://doi.org/10.1073/pnas.59.4.1187
• You have access

  Concerning negative conductance in the squid axon

  D Agin and C Schauf

  PNAS April 1, 1968 59 (4) 1201-1208; https://doi.org/10.1073/pnas.59.4.1201
• You have access

  Evidence for a relationship between mouse hemopoietic stem cells and cells forming colonies in culture

  A M Wu, L Siminovitch, J E Till, and E A McCulloch

  PNAS April 1, 1968 59 (4) 1209-1215; https://doi.org/10.1073/pnas.59.4.1209
• You have access

  The syndrome of excessive thyrocalcitonin produced by medullary carcinoma of the thyroid

  K E Melvin and A H Tashjian Jr

  PNAS April 1, 1968 59 (4) 1216-1222; https://doi.org/10.1073/pnas.59.4.1216
• You have access

  Elevation and depression of hepatic tyrosine transaminase activity by depletion and repletion of norepinephrine

  I B Black and J Axelrod

  PNAS April 1, 1968 59 (4) 1231-1234; https://doi.org/10.1073/pnas.59.4.1231
• You have access

  Periods of genetic transcription required for the synthesis of three enzymes during cellular slime mold development

  R Roth, J M Ashworth, and M Sussman

  PNAS April 1, 1968 59 (4) 1235-1242; https://doi.org/10.1073/pnas.59.4.1235
• You have access

  Polysome formation with tobacco mosaic virus RNA

  A Marcus, B Luginbill, and J Feeley

  PNAS April 1, 1968 59 (4) 1243-1250; https://doi.org/10.1073/pnas.59.4.1243
• You have access

  Mutants that make more lac repressor

  B Müller-Hill, L Crapo, and W Gilbert

  PNAS April 1, 1968 59 (4) 1259-1264; https://doi.org/10.1073/pnas.59.4.1259
• You have access

  Early estrogen action: nuclear synthesis and accumulation of protein correlated with enhancement of two DNA-dependent RNA polymerase activities

  T H Hamilton, C S Teng, and A R Means

  PNAS April 1, 1968 59 (4) 1265-1272; https://doi.org/10.1073/pnas.59.4.1265
• You have access

  The chelate structure of Micrococcus aerogenes rubredoxin

  H Bachmayer, K T Yasunobu, and H R Whiteley

  PNAS April 1, 1968 59 (4) 1273-1277; https://doi.org/10.1073/pnas.59.4.1273
• You have access

  The formation of 5S ribosomal ribonucleic acid in Bacillus subtilis by posttranscriptional modification

  N B Hecht, M Bleyman, and C R Woese

  PNAS April 1, 1968 59 (4) 1278-1283; https://doi.org/10.1073/pnas.59.4.1278
• You have access

  Protein synthesis in the isolated giant axon of the squid

  A Giuditta, W D Dettbarn, and M Brzin

  PNAS April 1, 1968 59 (4) 1284-1287; https://doi.org/10.1073/pnas.59.4.1284
• You have access

  The biogenesis of mitochondria, VI. Biochemical basis of the resistance of Saccharomyces cerevisiae toward antibiotics which specifically inhibit mitochondrial protein synthesis

  A W Linnane, A J Lamb, C Christodoulou, and H B Lukins

  PNAS April 1, 1968 59 (4) 1288-1293; https://doi.org/10.1073/pnas.59.4.1288
• You have access

  Restriction of infectious bacteriophage fd DNA's and an assay for in vitro host-controlled restriction and modification

  R Benzinger

  PNAS April 1, 1968 59 (4) 1294-1299; https://doi.org/10.1073/pnas.59.4.1294
• You have access

  Host specificity of DNA produced by Escherichia coli, X. In vitro restriction of phage fd replicative form

  S Linn and W Arber

  PNAS April 1, 1968 59 (4) 1300-1306; https://doi.org/10.1073/pnas.59.4.1300
• You have access

  N-terminal amino acid sequences of immunoglobulin chains in Polyodon spathula

  B Pollara, A Suran, J Finstad, and R A Good

  PNAS April 1, 1968 59 (4) 1307-1312; https://doi.org/10.1073/pnas.59.4.1307
• You have access

  The biosynthesis of mannosyl-1-phosphoryl-polyisoprenol in Micrococcus lysodeikticus and its role in mannan synthesis

  M Scher, W J Lennarz, and C C Sweeley

  PNAS April 1, 1968 59 (4) 1313-1320; https://doi.org/10.1073/pnas.59.4.1313
• You have access

  The amino acid sequence of porcine thyrocalcitonin

  J T Potts Jr, H D Niall, H T Keutmann, H B Brewer Jr, and L J Deftos

  PNAS April 1, 1968 59 (4) 1321-1328; https://doi.org/10.1073/pnas.59.4.1321
• You have access

  Chemical basis for heterogeneity of ribosomal proteins

  S Fogel and P S Sypherd

  PNAS April 1, 1968 59 (4) 1329-1336; https://doi.org/10.1073/pnas.59.4.1329
• You have access

  Changing patterns of histone acetylation and RNA synthesis in regeneration of the liver

  B G Pogo, A O Pogo, V G Allfrey, and A E Mirsky

  PNAS April 1, 1968 59 (4) 1337-1344; https://doi.org/10.1073/pnas.59.4.1337
• You have access

  A preferred origin for the replication of lambda DNA

  S Makover

  PNAS April 1, 1968 59 (4) 1345-1348; https://doi.org/10.1073/pnas.59.4.1345
• You have access

  Polyribosomal changes during inhibition of rabbit hemoglobin synthesis by an isoleucine antagonist

  M Hori and M Rabinovitz

  PNAS April 1, 1968 59 (4) 1349-1355; https://doi.org/10.1073/pnas.59.4.1349
• You have access

  Conformation dependence of intramolecular energy transfer in phycoerythrin

  F D Macdowall, T Bednar, and A Rosenberg

  PNAS April 1, 1968 59 (4) 1356-1363; https://doi.org/10.1073/pnas.59.4.1356
• You have access

  Cyclic adenosine monophosphate, CA++, and membranes

  H Rasmussen and A Tenenhouse

  PNAS April 1, 1968 59 (4) 1364-1370; https://doi.org/10.1073/pnas.59.4.1364
• You have access

  Specific inhibition of virus growth in cells treated with phospholipase C

  R M Friedman and I Pastan

  PNAS April 1, 1968 59 (4) 1371-1378; https://doi.org/10.1073/pnas.59.4.1371