This journal provides immediate access to some articles. Volume 61(3); November 1968 MICROBIOTAS OF THE BANDED IRON FORMATIONS PMCID: PMC305394 OCEAN BOTTOM PHOTOGRAPHS IN THE AREA OF THE OLDEST KNOWN OUTCROPS, NORTH ATLANTIC OCEAN PMCID: PMC305395 OPTIMALITY CRITERIA IN STRUCTURAL DESIGN PMCID: PMC305396 MEROMORPHIC FUNCTIONS, COVERING PROPERTIES, AND CLUSTER SETS PMCID: PMC305397 SOME NONPARAMETRIC SEQUENTIAL TESTS WITH POWER ONE PMCID: PMC305398 AN INEQUALITY FOR THE HILBERT TRANSFORM PMCID: PMC305399 THE EFFECT OF PRESSURE ON THE OXIDATION STATE OF IRON, II. OXYGEN LIGANDS PMCID: PMC305400 Spin-labeled mitochondrial lipids in Neurospora crassa. PMCID: PMC305401 Induction of DNA polymerase in human lymphocytes by phytohemagglutinin. PMCID: PMC305402 Immunochemical properties of the nerve growth factor. PMCID: PMC305403 The in vitro translation of Acetabularia mediterranea RNA. PMCID: PMC305404 ON THE LIMITATION OF BROOD SIZE IN PASSERINE BIRDS BY THE ABILITY OF ADULTS TO NOURISH THEIR YOUNG PMCID: PMC305405 MATING FREQUENCY IN NATURAL POPULATION OF SKIPPERS AND BUTTERFLIES AS DETERMINED BY SPERMATOPHORE COUNTS PMCID: PMC305406 Electrophoretic analysis of antibody produced by single cells. PMCID: PMC305407 Cellular membranes and tumor behavior: a new hypothesis. PMCID: PMC305408 Effect of thymosin and an antithymosin serum on allograft survival in mice. PMCID: PMC305409 Changes in fluorescence, turbidity, and birefringence associated with nerve excitation. PMCID: PMC305410 On the sliding-filament model of muscular contraction, IV. Calculation of force-velocity curves. PMCID: PMC305411 Water-soluble human transplantation antigen. PMCID: PMC305412 Evidence for semiconduction in Aplysia nerve membrane. PMCID: PMC305413 The catch property of ordinary muscle. PMCID: PMC305414 Brain function and macromolecules, IV. Uridine incorporation into polysomes of mouse brain during different behavioral experiences. PMCID: PMC305415 Arousal and the conversion of "short-term" to "long-term" memory. PMCID: PMC305416 Gene duplication as the basis for amino acid ambiguity in the alpha-chain polypeptides of mouse hemoglobins. PMCID: PMC305417 Three kinds of genetic variability in yeast populations. PMCID: PMC305418 Developmental implications of multiple tissue studies in glucose-6-phosphate dehydrogenase-deficient heterozygotes. PMCID: PMC305419 Probable assignment of the Duffy blood group locus to chromosome 1 in man. PMCID: PMC305420 A deletion analysis of prophage lambda and adjacent genetic regions. PMCID: PMC305421 Genetic and antigenic studies and partial purification of a human serum lipoprotein carrying the Lp antigenic determinant. PMCID: PMC305422 The role of ecdysone in DNA-puff formation and DNA synthesis in the polytene chromosomes of Sciara coprophila. PMCID: PMC305423 Glucose-6-phosphate dehydrogenase: evidence for tetrameric structure in doves (Streptopelia). PMCID: PMC305424 Effect of vitamin E on memranes of the intestinal cell. PMCID: PMC305425 Enhancement effects and the identity of the two photochemical reactions of photosynthesis. PMCID: PMC305426 DNA replication in vivo by a temperature-sensitive polynucleotide ligase mutant of T4. PMCID: PMC305427 Dissolution of erythrocyte membranes in water and comparison of the membrane protein with other structural proteins. PMCID: PMC305428 Studies of the messenger RNA of bacteriophage lambda, I. Various species synthesized early after induction of the prophage. PMCID: PMC305429 Mechanism of the enzymic reduction of N2: the binding of adenosine 5'-triphosphate and cyanide to the N2-reducing system. PMCID: PMC305430 Reversible disaggregation of the cytosol-estrogen binding protein of uterine cytosol. PMCID: PMC305431 Proteins in bioelectricity: the control of ion movements across excitable membranes. PMCID: PMC305432 Ribosome-catalyzed peptidyl transfer: substrate specificity at the P-site. PMCID: PMC305433 Partial purification of a lipoprotein with 5'-nucleotidase activity from membranes of rat liver cells. PMCID: PMC305434 Studies on the in vitro synthesis of transforming DNA. PMCID: PMC305435 Guanosine 5'-triphosphatase activity of initiation factor f2. PMCID: PMC305436 Chain models of 6.6S and 3.9S mouse myeloma gamma A immunoglobulin molecules. PMCID: PMC305437 The state of magnesium in cells as estimated from the adenylate kinase equilibrium. PMCID: PMC305438 Selective nonenzymic cleavage of the myosin rod: isolation of the coiled-coil alpha-rope section from the c-terminus of the molecule. PMCID: PMC305439 LOW-TEMPERATURE STUDIES ON PHYTOCHROME: LIGHT AND DARK REACTIONS IN THE RED TO FAR-RED TRANSFORMATION AND NEW INTERMEDIATE FORMS OF PHYTOCHROME PMCID: PMC305440 The interaction of hemoglobin and its subunits with 2,3-diphosphoglycerate. PMCID: PMC305441 The stability of native DNA-RNA complexes during in vivo phiX-174 transcription. PMCID: PMC305442 Dimers of alanine transfer RNA with acceptor activity. PMCID: PMC305443 Enzyme secretion in mouse pancreas mediated by adenosine-3'5'-cyclic phosphate and inhibited by adenosine-3'-phosphate. PMCID: PMC305444 Discontinuous synthesis of DNA during replication. PMCID: PMC305445 SCIENTIFIC PROGRAM AND ABSTRACTS OF CONTRIBUTED PAPERS PMCID: PMC305446 Correction ERRATUM PMCID: PMC539221 Corrects: The biological activity of 25-hydroxycholecalciferol, a metabolite of vitamin D3. Proc Natl Acad Sci U S A. 1968 October; 61(2): 717–718. 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