601
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Roberts B, Roberts S. The DNA content of testes and Malpigphian tubule nuclei of Tricholioproctia impatiens (Sarcophagidae, Diptera). Chromosoma 1972; 39:83-91. [PMID: 4116294 DOI: 10.1007/bf00320592] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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602
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Krook L, Lutwak L, McEntee K, Henrikson PA, Braun K, Roberts S. Nutritional hypercalcitoninism in bulls. THE CORNELL VETERINARIAN 1971; 61:625-39. [PMID: 5166135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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603
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McCune RW, Gill TH, Von Hungen K, Roberts S. Catecholamine-sensitive adenyl cyclase in cell-free preparations from rat cerebral cortex. LIFE SCIENCES. PT. 2: BIOCHEMISTRY, GENERAL AND MOLECULAR BIOLOGY 1971; 10:443-50. [PMID: 4326123 DOI: 10.1016/0024-3205(71)90306-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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604
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Zomzely CE, Roberts S, Peache S, Brown DM. Cerebral protein synthesis. 3. Developmental alteratons in the stability of cerebral messenger ribonucleic acid-ribosome complexes. J Biol Chem 1971; 246:2097-103. [PMID: 5555563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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605
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Zomzely CE, Roberts S, Peache S. Isolation of RNA with properties of messenger RNA from cerebral polyribosomes. Proc Natl Acad Sci U S A 1970; 67:644-51. [PMID: 5289014 PMCID: PMC283254 DOI: 10.1073/pnas.67.2.644] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
RNA which dissociated from purified cerebral polyribosomes of adult rats in the presence of EDTA was isolated by fractionation in a discontinuous sucrose gradient. The yield was 2% of the total polyribosomal RNA. The base composition resembled the complementary values for rat DNA and was very different from base compositions of ribosomal RNA and transfer RNA. This RNA fraction contained a large proportion of molecules which were rapidly labeled in vivo and hybridized to homologous DNA. The polyribosomal RNA preparation also exhibited high template activity in a cerebral cell-free system which had previously been stripped of the capacity to incorporate amino acids in the absence of added messenger RNA (mRNA). Sedimentation analysis revealed only two peaks, with coefficients of approximately 8 S and 16 S. The data indicate that RNA with the properties of mRNA can be selectively isolated from cerebral polyribosomes under mild conditions which avoid degradation.
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606
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Abstract
1. Acetylation of histones by an enzyme system derived from rat brain and liver (histone acetylase) was studied by using [1-(14)C]acetyl-CoA as the acetyl group donor. 2. The activity of this enzyme was largely confined to the nucleus. 3. Histone-acetylating activity of cerebral nuclei purified by centrifugation through 1.9m-sucrose was not altered by the presence of the cytoplasmic fraction. 4. Cerebral nuclei from adult rats exhibited greater histone-acetylating activity than did the corresponding preparation from newborn animals. 5. Nuclear acetylating activity was higher in brain than in liver of adult rats but not in newborn animals. 6. The partially purified enzyme from cerebral nuclei, prepared by ammonium sulphate fractionation of an acetone-dried powder, specifically catalysed histone acetylation. 7. Polylysine, protamine, serum albumin and gamma-globulin were not enzymically acetylated by this preparation. 8. Soluble acetylating preparations from both brain and liver nuclei were more active towards arginine-rich F3 and slightly lysine-rich F2a and F2b histone fractions than towards the lysine-rich F1 fraction. 9. Enzymic acetylation of chromatin-bound proteins was much less extensive than that of free histones. 10. The high histone acetylase activity in mature brain may reflect the importance of this process in the genetic control of cerebral function.
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607
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608
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McCune RW, Roberts S, Young PL. Competitive inhibition of adrenal delta 5-3 beta-hydroxysteroid dehydrogenase and delta 5-3-ketosteroid isomerase activities by adenosine 3',5'-monophosphate. J Biol Chem 1970; 245:3859-67. [PMID: 4321768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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609
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Roberts S. Inhibition of lactation. "Estrovis" (quinestrol 4 mg) v. copious fluids for 48 hours. MIDWIVES CHRONICLE 1970; 83:72-3. [PMID: 5199224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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610
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Rey M, Roberts S, Dieffenbacher A, Dreiding AS. Stereochemische Aspekte der Addition von Ketenen an Cyclopentadien. Helv Chim Acta 1970. [DOI: 10.1002/hlca.19700530223] [Citation(s) in RCA: 92] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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611
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Samli MH, Roberts S. Properties of RNA fractions from nuclei of brain cells which stimulate incorporation of amino acids by brain ribosomes. J Neurochem 1969; 16:1565-80. [PMID: 5379235 DOI: 10.1111/j.1471-4159.1969.tb10355.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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612
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Slack GA, Roberts S, Vallin JT. Optical Absorption ofFe2+in CdTe in the Near and Far Infrared. ACTA ACUST UNITED AC 1969. [DOI: 10.1103/physrev.187.511] [Citation(s) in RCA: 158] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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613
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Bondy SC, Roberts S. Developmental and regional variations in ribonucleic acid synthesis on cerebral chromatin. Biochem J 1969; 115:341-9. [PMID: 4907883 PMCID: PMC1185107 DOI: 10.1042/bj1150341] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
1. Chromatin was prepared from purified nuclei isolated from liver and cerebral regions of the rat. 2. The capacity of these preparations to promote RNA synthesis in the presence of bacterial RNA polymerase was determined. 3. The rate of RNA synthesis on chromatin was normally 12-21% of the rate observed with native DNA, but was markedly stimulated on addition of 200mm-ammonium sulphate. 4. At physiological concentrations (80mug./ml.), the brain-specific S-100 protein inhibited RNA synthesis on DNA and chromatin. 5. Cerebral chromatin from foetal and newborn animals was more active in RNA synthesis than were the analogous preparations from liver. 6. Cerebellar chromatin maintained a high rate of RNA synthesis during brain maturation. In contrast, RNA synthesis on chromatin from other brain regions and liver declined with age of the rat. 7. RNA synthesized on chromatin stimulated amino acid incorporation in an Escherichia coli ribosomal system and hybridized with homologous DNA. 8. RNA synthesized on chromatin from adult cortex or hindbrain hybridized with DNA to a greater extent than that synthesized on cerebellar chromatin. 9. The proportion of RNA formed on cerebral-cortical chromatin that hybridized with DNA increased with age of the rat. 10. The results indicate that the total amount and the types of RNA synthesized on cerebral chromatin vary regionally and during development.
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614
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Taft RD, Roberts S, McLean KH. Budd-Chiari Syndrome with anomalous hepatic venous drainage. A case report. AUSTRALASIAN RADIOLOGY 1969; 13:93-95. [PMID: 5784592 DOI: 10.1111/j.1440-1673.1969.tb01215.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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615
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Slack GA, Oliver DW, Chrenko RM, Roberts S. Optical Absorption ofY3Al5O12from 10- to 55 000-cm−1Wave Numbers. ACTA ACUST UNITED AC 1969. [DOI: 10.1103/physrev.177.1308] [Citation(s) in RCA: 143] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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616
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Schneider D, Roberts S. Base compositons of 18 S and 28 S RNA fractions from rat cerebral ribosomes. J Neurochem 1968; 15:1469-71. [PMID: 5729426 DOI: 10.1111/j.1471-4159.1968.tb05929.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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617
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Zomzely CE, Roberts S, Gruber CP, Brown DM. Cerebral protein synthesis. II. Instability of cerebral messenger ribonucleic acid-ribosome complexes. J Biol Chem 1968; 243:5396-409. [PMID: 5702052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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618
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619
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Abstract
1. Cerebral RNA of adult and newborn rats was labelled in vivo by intracervical injection of [5-(3)H]uridine or [(32)P]phosphate. Hepatic RNA of similar animals was labelled by intraperitoneal administration of [6-(14)C]orotic acid. Nuclear and cytoplasmic fractions were isolated and purified by procedures involving extraction with phenol and repeated precipitation with ethanol. 2. The fraction of pulse-labelled RNA from cerebral nuclei that hybridized to homologous DNA exhibited a wide range of turnover values and was heterogeneous in sucrose density gradients. 3. Base composition of the hybridizable RNA was similar to that of the total pulse-labelled material; both were DNA-like. 4. Pulse-labelled cerebral nuclear RNA hybridized to a greater extent than cytoplasmic RNA for at least a week after administration of labelled precursor. This finding suggested that cerebral nuclei contained a hybridizable component that was not transferred to cytoplasm. 5. The rates of decay of the hybridizable fractions of cerebral nuclei and cytoplasm were faster in the newborn animal than in the adult. Presumably a larger proportion of labile messenger RNA molecules was present in the immature brain. 6. Cerebral nuclear and cytoplasmic RNA fractions from newborn or adult rats, labelled either in vivo for periods varying from 4min. to 7 days or in vitro by exposure to [(3)H]-dimethyl sulphate, uniformly hybridized more effectively than the corresponding hepatic preparation. These data suggested that a larger proportion of RNA synthesis was oriented towards messenger RNA formation in brain than in liver.
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620
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Roberts S. Influence of elevated circulating levels of amino acids on cerebral concentrations and utilization of amino acids. PROGRESS IN BRAIN RESEARCH 1968; 29:235-43. [PMID: 4898074 DOI: 10.1016/s0079-6123(08)64159-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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621
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Roberts S, McCune RW, Creange JE, Young PL. Adenosine 3',5'-cyclic phosphate: stimulation of steroidogenesis in sonically disrupted adrenal mitochondria. Science 1967; 158:372-4. [PMID: 6061886 DOI: 10.1126/science.158.3799.372] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Adenosine 3'5'-cyclic phosphate stimulated the conversion of added cholesterol to pregnenolone in "coupled" rat adrenal mitochondria provided with succinate, and in "leaky" mitochondria fortified with reduced nicotinamide adenine dinucleotide phosphate. Adenine nucleotides other than adenosine 3',5'-cyclic phosphate did not duplicate these actions. The cyclic nucleotide was also effective in supernatants from sonically disrupted mitochondria. The minimum effective concentration was 50 micromoles per liter or less. The results suggest that adenosine 3',5'-cyclic phosphate stimulates corticosteroidogenesis by activating the mitochondrial enzymes which are rate-limiting in the utilization of cholesterol.
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622
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Cheetham E, Bautch J, Roberts S. Not education, not service, but nursing. Effecting change. Am J Nurs 1967; 67:995-7. [PMID: 5181635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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623
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624
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Zomzely CE, Roberts S, Brown DM, Provost C. Cerebral protein synthesis. I. Physical properties of cerebral ribosomes and polyribosomes. J Mol Biol 1966; 19:455-68. [PMID: 5969075 DOI: 10.1016/s0022-2836(66)80016-5] [Citation(s) in RCA: 53] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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625
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Hanking BM, Roberts S. Influence of alterations in intracellular levels of amino-acids on protein-synthesizing activity of isolated ribosomes. Nature 1965; 207:862-4. [PMID: 5885947 DOI: 10.1038/207862a0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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626
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Roberts S, Creange FE, Young PL. Stimulation of steroid transformations in adrenal mitochondria by cyclic 3',5'-adenosine phosphate. Biochem Biophys Res Commun 1965; 20:446-51. [PMID: 5860160 DOI: 10.1016/0006-291x(65)90598-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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627
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Zomzely CE, Roberts S, Brown DM, Rapaport D. Isolation of 55-S ribonucleoprotein particles with amino acid-incorporating activity. BIOCHIMICA ET BIOPHYSICA ACTA 1965; 103:529-31. [PMID: 5853499 DOI: 10.1016/0005-2787(65)90152-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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628
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Roberts S, Creange JE, Young PL. Stimulation of steroid C-11-beta-hydroxylation in adrenal mitochondria by cyclic 3',5'-adenosine monophosphate. Nature 1965; 207:188-90. [PMID: 4287497 DOI: 10.1038/207188a0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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629
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Hanking BM, Roberts S. Stimulation of protein synthesis in vitro by elevated levels of amino acids. BIOCHIMICA ET BIOPHYSICA ACTA 1965; 104:427-38. [PMID: 5855050 DOI: 10.1016/0304-4165(65)90348-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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630
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Creange JE, Roberts S. Stimulation of steroid C-11-beta and C-18 hydroxylations in rat adrenal homogenates by adenosine 3',5'-phosphate via a mechanism not requiring endogenous precursor, glycogen phosphorylation or NADPH generation. Steroids 1965:Suppl 2:13-28. [PMID: 4378918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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631
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632
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633
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Roberts S. Optical Properties of Nickel and Tungsten and Their Interpretation According to Drude's Formula. ACTA ACUST UNITED AC 1959. [DOI: 10.1103/physrev.114.104] [Citation(s) in RCA: 146] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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634
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635
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Roberts S. Dielectric Changes of Electroluminescent Phosphor During Illumination*. ACTA ACUST UNITED AC 1953. [DOI: 10.1364/josa.43.000590] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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636
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