251
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Hackett PA, Willis C, Gauthier M. Multiphoton decomposition of hexafluoroacetone: Effects of pressure, fluence, wavelength, and temperature on the decomposition yield and C‐13 and O‐18 isotopic selectivity. J Chem Phys 1979. [DOI: 10.1063/1.438626] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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252
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Hackett PA, Gauthier M, Willis C, Pilon R. The selective decomposition of CF3 13COCF3 molecules at natural abundance: Multiphoton dissociation at threshold. J Chem Phys 1979. [DOI: 10.1063/1.438133] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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253
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Drouin M, Gauthier M, Pilon R, Hackett P, Willis C. Enrichment of carbon-13 in the products of the multiphoton dissociation of CF3X Compounds. Chem Phys Lett 1978. [DOI: 10.1016/0009-2614(78)85699-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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254
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Bullot J, Cordier P, Gauthier M. Electric field quenching of recombination fluorescence in photoionized nonpolar solutions. II. Electron range and the quantum yield for geminate pair creation. J Chem Phys 1978. [DOI: 10.1063/1.436521] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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255
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Blais J, Gauthier M. Éffets des interactions intermoléculaires par liaison hydrogène sur l'absorption et la luminescence des amines aromatiques en matrice vitreuse a 77 K. ACTA ACUST UNITED AC 1978. [DOI: 10.1016/0047-2670(78)80168-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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256
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Gauthier M, Hackett PA, Drouin M, Pilon R, Willis C. Carbon-13 enrichment in the room temperature multiphoton decomposition of CF3Br. CAN J CHEM 1978. [DOI: 10.1139/v78-365] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
High isotopic selectivities have been observed in the multiphoton decomposition of CF3Br at room temperature. Photolysis of natural abundance CF3Br gives C2F6 enriched to 42% in carbon-13. This is higher than observed for CF3I even at very low temperatures.
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257
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Bullot J, Cordier P, Gauthier M. Electric field quenching of recombination fluorescence in photoionized nonpolar solutions. I. Free electron quantum yield determination. J Chem Phys 1978. [DOI: 10.1063/1.436763] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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258
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Hackett PA, Gauthier M, Willis C. Mechanisms of multiphoton dissociation of CF3COCF3. J Chem Phys 1978. [DOI: 10.1063/1.436849] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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259
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Gauthier M, Flatau G. [Concentration and method of cadmium fixation by a marine Vibrio]. COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L'ACADEMIE DES SCIENCES. SERIE D: SCIENCES NATURELLES 1977; 285:817-20. [PMID: 411587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In many organisms, intracellular fixation of cadmium involves specific proteins, the metallothioneins. A similar phenomenon was demonstrated in a marine bacterium belonging to the genus Vibrio. The accumulation of the metal is a function of its concentration in the medium. The uptake is also increased by cysteine, which decreases the toxicity of the metal.
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260
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Bullot J, Gauthier M. Effect of temperature and phase on the photoionization energy threshold of TMPD in hydrocarbon solvents. CAN J CHEM 1977. [DOI: 10.1139/v77-255] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The temperature dependence of the TMPD photoionization energy threshold, I, in a set of eight hydrocarbon solvents has been systematically studied, from room temperature down to 77 K. For this purpose ion-pair formation is detected either by measuring the photocurrents in the liquid phase or by measuring the recombination luminescence intensity in the solid phase. It is found that I(liquid) increases linearly when the temperature is decreased down to the liquid–solid transition temperature. At this temperature I undergoes an abrupt increase of 0.2–0.6 eV depending on the hydrocarbon and the nature of the phase transition. Any subsequent solid–solid phase change is accompanied by a new shift towards higher energy. In the low temperature phase of all the studied crystals, I(solid) has a constant value down to 77 K. Glass-forming liquids have a very different behavior: I varies linearly in the liquid and the straight line extrapolates to the I(glass) value at 77 K. The applicability of the two methods is discussed. From the present data it is concluded that the conduction state energy, V0, is constant in the low-temperature phase of crystals. By calculating the polarization energy due to the TMPD+ cation and from data on the temperature dependence of V0 in the liquid phase, we have estimated V0 in crystalline n-hexane (0.64 eV) and 2,2,4-trimethylpentane (0.44 eV) and in the plastic phase of cyclohexane (0.47 eV) and 2,2-dimethylbutane (0.01 eV). Finally a correlation of I with the medium density is described.
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261
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Bullot J, Gauthier M. On the ionization potential of a solute molecule in hydrocarbon solutions: Effect of temperature and phase. Chem Phys Lett 1976. [DOI: 10.1016/0009-2614(76)85106-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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262
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Bernas A, Blais J, Gauthier M, Grand D. Photoionization in organic solids: Influence of the solvent molecular shape on solute ionization potentials. Chem Phys Lett 1975. [DOI: 10.1016/0009-2614(75)80012-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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263
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Lemaire S, Labrie F, Gauthier M. Adenosine-3',5'-monophosphate-dependent protein kinase from bovine anterior pituitary gland. 3. Structural specificity of the ATP site of the catalytic subunit. CANADIAN JOURNAL OF BIOCHEMISTRY 1974; 52:137-41. [PMID: 4362231 DOI: 10.1139/o74-021] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The effect of analogues and derivatives of adenosine 3′,5′-monophosphate (cyclic AMP) and of ATP on the incorporation of 32P from [γ-32P]ATP into histones has been measured using the purified catalytic subunit of adenohypophyseal protein kinase. Gamma-labeled CTP, GTP, and UTP cannot substitute for [γ-32P]ATP but they slightly inhibit the phosphorylation by [γ-32P]-ATP when present as unlabeled compounds. A stringent requirement of the adenine nucleus is observed for the ability to compete at the ATP site, inhibitions of 42, 39, 32, and 63% being observed respectively with adenine, adenosine, 5′AMP, and ADP, while the corresponding purine or pyrimidine derivatives have no effect when present at a 13-fold molar excess relative to [γ-32P]ATP. The N6-benzoyl and N6-butyryl derivatives of cyclic AMP are inactive whereas the 8-substituted derivatives are generally as active as cyclic AMP itself, except for the 8-amino- and 8-hydroxy-derivatives, which exhibit a lower degree of competition. All cyclic AMP and ATP analogues and derivatives that inhibit histone phosphorylation by [γ-32P]ATP act as competitive inhibitors. Such competition at the ATP site of the catalytic subunit of protein kinase probably accounts for the progressive inhibition of cyclic-AMP-dependent protein kinase activity measured at high concentrations (above 10−5 M) of the cyclic nucleotide.
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264
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Gauthier M, Duclot M, Hammou A, Déportes C. Nombre de transport et conductivite cationique dans les oxydes de calcium et de strontium. J SOLID STATE CHEM 1974. [DOI: 10.1016/0022-4596(74)90050-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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265
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Labrie F, Gauthier M, Pelletier G, Borgeat P, Lemay A, Gouge JJ. Role of microtubules in basal and stimulated release of growth hormone and prolactin in rat adenohypophysis in vitro. Endocrinology 1973; 93:903-14. [PMID: 4353856 DOI: 10.1210/endo-93-4-903] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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266
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267
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Boucher R, Gauthier M, Jolicoeur P, Labrie F. Translational control of protein synthesis in rat anterior pituitary by N 6 -2'-O-dibutyryl adenosine 3',5'-monophosphate. CANADIAN JOURNAL OF BIOCHEMISTRY 1973; 51:913-9. [PMID: 4352096 DOI: 10.1139/o73-113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Actinomycin D, at doses (25 and 50 μg/ml) that block RNA synthesis to less than 3% of the control rate, inhibits the incorporation of [3H]leucine into adenohypophyseal proteins and the release of newly synthesized proteins by 50 and 60%, respectively, of the control rates. Despite this lowering of basal levels of total protein synthesis and release in presence of the antibiotic, the percentage of stimulation of both protein synthesis and release by 5 mM N6-2′-O-dibutyryl adenosine 3′5′-monophosphate (dbcAMP) is not depressed by actinomycin D. When rat hemipituitaries are incubated with [3H]uridine, dbcAMP does not stimulate the labeling of total cytoplasmic RNA or the preferential labeling of any cytoplasmic RNA species resolved on sucrose gradient. There is no stimulatory effect of dbcAMP on total labeling or preferential incorporation into nuclear RNA species extracted at 24 °C or at 65 °C. Labeling of the nucleotide pools was unchanged up to 1 h of incubation but was increased (40–70%) during the last [Formula: see text] of incubation. These data suggest that the short-term stimulatory effects of dbcAMP on total adenohypophyseal protein synthesis and release are exerted at the transiational level.
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268
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Gauthier M, Snelling D. Possible production of O2(1Δg) and O2(1Σ+g) in the reaction of NO with O3. Chem Phys Lett 1973. [DOI: 10.1016/0009-2614(73)80226-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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269
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Roy A, Gauthier M, Hussonnois JL. [Prophylactic use of a transvenous pacing catheter. Involvement of the external pacemaker in 2 fatal cases]. ARCHIVES DES MALADIES DU COEUR ET DES VAISSEAUX 1972; 65:1371-4. [PMID: 4121002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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270
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Abraham M, Gauthier M. Pouvoir thermoélectrique homogène et surfusion. Electrochim Acta 1972. [DOI: 10.1016/0013-4686(72)80010-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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271
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Gauthier M, Hussonnois JL. [Dependability of stimulators. Apropos of 2 fatal accidents]. CAHIERS D'ANESTHESIOLOGIE 1972; 20:451-5. [PMID: 5079426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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272
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Abraham M, Gauthier M. La thermopotentiometrie appliquee a l'etude du comportement de certains liquides surfondus. Electrochim Acta 1972. [DOI: 10.1016/0013-4686(72)85029-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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273
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Abraham M, Gauthier M. Thermopiles à nitrates fondus: évolution du pouvoir thermoélectrique initial lors de la transition liquide-verre. Electrochim Acta 1971. [DOI: 10.1016/0013-4686(71)85059-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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274
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Gauthier M, Snelling DR. Mechanism of Singlet Molecular Oxygen Formation from Photolysis of Ozone at 2537 Å. J Chem Phys 1971. [DOI: 10.1063/1.1674679] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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275
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