76
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Picard G. [Tribulations of gastrointestinal surgery]. REVUE DE L'INFIRMIERE 1994:42-4. [PMID: 7652266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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77
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Roy B, Ackermann HW, Pandian S, Picard G, Goulet J. Biological inactivation of adhering Listeria monocytogenes by listeriaphages and a quaternary ammonium compound. Appl Environ Microbiol 1993; 59:2914-7. [PMID: 8215364 PMCID: PMC182386 DOI: 10.1128/aem.59.9.2914-2917.1993] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The use of listeriaphages as a means of disinfecting contaminated stainless-steel and polypropylene surfaces was investigated. Surfaces artificially contaminated with L. monocytogenes 10401 and 8427 were sanitized with suspensions of listeriaphages (H387, H387-A, and 2671), all belonging to the Siphoviridae family. Phage suspensions at concentrations of up to 3.5 x 10(8) PFU/ml were at least as efficient as a 20 ppm solution of a quaternary ammonium compound (QUATAL) in reducing L. monocytogenes populations. A synergistic activity was observed when two or more phages were used in combination and when phages were suspended in QUATAL. The biological activity of the three phages was not affected by QUATAL concentrations of 50 ppm and a contact time of 4 h.
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78
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Renault S, Degroote F, Picard G. Identification of short tandemly repeated sequences in extrachromosomal circular DNAs from Drosophila melanogaster embryos. Genome 1993; 36:244-54. [PMID: 8514153 DOI: 10.1139/g93-034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A sequence (scl) belonging to the recently identified dodeca satellite family was found to be a major family of extrachromosomal circular DNA molecules from Drosophila melanogaster embryos. The basic unit consists of the 11-bp repeat 5' ACTGGTCCCGT 3', is 63% G + C rich, and shares some similarity with the Escherichia coli chi sequence. This family accounts for only about 0.06% of the genome but very likely for a higher proportion of the circular DNA molecules. It is organized in the genome into at least five main clusters contained in DNA fragments larger than 20 kb and several minor clusters. These clusters are located in the heterochromatic pericentromeric regions. Two other families of simple repeated sequences, the 1.686 g/cm3 (5' AATAACATAG 3') and the 1.705 g/cm3 (5' AAGAG 3') satellite DNAs, were also found in circular DNAs, while another family, the 1.672 g/cm3 (5' AATAT 3'), was not detected. The representation of the simple repeated sequences in circular molecules is not correlated to their genomic representation. Among the seven families of sequences identified to date in extrachromosomal circular DNAs from embryos, the dodeca satellite, the 240-bp repeat of the rDNA intergenic spacer, and the 1.688 and 1.705 g/cm3 satellite DNAs are the most represented families, while the 5S genes, the histone genes, and the 1.686 g/cm3 satellite DNA are present in a lower amount.
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79
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Renault S, Degroote F, Picard G. Despite its high representation in extrachromosomal circular DNAs from Drosophila embryos, the dodecasatellite does not allow autonomous replication in cultured cells. Biol Cell 1993; 79:51-4. [PMID: 8118410 DOI: 10.1016/0248-4900(93)90262-d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The dodecasatellite is a 11/12 bp tandemly repeated sequence which is overrepresented, with regard to its genomic representation, in extrachromosomal circular DNAs from D melanogaster embryos. Here we show that a bacterial plasmid carrying a cluster of dodecasatellite is not able to replicate efficiently in cultured cells. This observation does not support the hypothesis that the overrepresentation results from an autonomous replication of dodecasatellite circular DNA molecules.
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80
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Picard G, Leutenegger AF, von Huben R. [Antibiotic therapy in ambulatory surgery]. SCHWEIZERISCHE RUNDSCHAU FUR MEDIZIN PRAXIS = REVUE SUISSE DE MEDECINE PRAXIS 1992; 81:875-8. [PMID: 1631446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Antibiotic therapy in outpatient surgical care is reviewed. In the first section some skin and soft-tissue infections are discussed, where antibiotics are likely to achieve clinical cure. In the second section we examine, where surgical treatment alone is essential for successful eradication of the infection. Wound management, where antibiotics are still controversial, is mentioned in the last section. Some pharmacological data on the discussed antibiotics are given.
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81
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Lamarche F, Picard G, Téchy F, Aghion J, Leblanc RM. Complex formation between chlorophyll a and cytochrome c: surface properties at the air-water interface. Absorbance, fluorescence and fluorescence-lifetime in Langmuir-Blodgett films. EUROPEAN JOURNAL OF BIOCHEMISTRY 1991; 197:529-34. [PMID: 1851091 DOI: 10.1111/j.1432-1033.1991.tb15941.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The binding of cytochrome c to an insoluble monolayer of chlorophyll a was studied. Surface pressure (II), surface potential (delta V) and [14C]cytochrome c surface-concentration (gamma) isotherms were measured versus molecular area (sigma) in mixed films. Compared to the successive-addition method, this procedure allows the formation of homogeneous mixed films. The cytochrome c is incorporated into a chlorophyll a monolayer, compressed at a surface pressure of 20 mN.m-1. On expansion, the quantity of protein incorporated into the monolayer gradually increases. Subsequent compression-expansion cycles result in similar isotherms, distinct from that measured during the first expansion. All surface properties measured, but more specifically the surface radioactivity of [14C]cytochrome c, indicate the irreversibility of protein incorporation into the chlorophyll a monolayer. In fact, surface properties of the binary film are completely different from the properties of either of the pure components. As a result, calculated values of surface potentials for mixed films using the additivity law deviate from experimentally measured potentials. The absorption and fluorescence spectra of mixed films transferred onto a solid substrate by the Langmuir-Blodgett technique, indicate a dilution effect of chlorophyll a by cytochrome c. However, the dilution effect cannot be detected by the fluorescence lifetimes of pure chlorophyll a and mixed chlorophyll a-cytochrome c films, both shorter than 0.2 ns. This provides support for the existence of an energy-transfer mechanism between chlorophyll a monomer and chlorophyll a aggregates which could serve as an energy trap. The role of the protein could be related to that of the matrix.
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82
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Bocage P, Ferry D, Picard G. Proprietes oxydoreductrices et oxoacides du magnesium dans le melange BaCl2CaCl2NaCl (23,5%–24,5%–52% molaire) fondu a 600°C. Electrochim Acta 1991. [DOI: 10.1016/0013-4686(91)85195-d] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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83
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Picard G, Leutenegger AF. [Preventive use of antibiotics in surgery: a review]. THERAPEUTISCHE UMSCHAU 1990; 47:561-8. [PMID: 2202074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
As a rule, prophylactic antibiotics should only be given pre- or perioperatively as a single shot. Cephalosporins of the first and second generation are still quite effective and appear to be the most widely used drugs for this purpose. In some cases a second drug, like i.e. metronidazole, can be added. For each surgical specialty, the most appropriate prophylactic regimen is discussed.
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84
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Pasquier P, Ferry D, Picard G. Etude thermodynamique et cinetique du systeme electrochimique Sn(II)/Sn dans l'eutectique LiClKCl A 723 K. Electrochim Acta 1990. [DOI: 10.1016/0013-4686(90)90088-h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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85
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Degroote F, Renault S, Picard G. Nucleotide sequence of circular DNA molecules homologous to the 240 bp tandem repeats of the intergenic spacer of Drosophila melanogaster ribosomal DNA. Biol Cell 1990; 69:69-70. [PMID: 2124511 DOI: 10.1016/0248-4900(90)90330-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We have determined the nucleotide sequence of ten 240 bp repeated sequences of the DNA intergenic spacer present in circular DNA molecules purified from D melanogaster embryos. No significant difference was found with the sequence of the chromosomal units. This suggests that most of the circular molecules homologous to the 240 bp repeats are generated by homologous recombination between adjacent chromosomal units.
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86
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Degroote F, Pont G, Micard D, Picard G. Extrachromosomal circular DNAs in Drosophila melanogaster: comparison between embryos and Kc0% cells. Chromosoma 1989; 98:201-6. [PMID: 2510979 DOI: 10.1007/bf00329684] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We established the size distribution of extrachromosomal covalently closed circular DNA molecules from embryos of various Drosophila melanogaster strains and from Kc0% tissue culture cells. In embryos, more than 80% of the circular DNA molecules are smaller than 2.5 kb and all the distributions show a peak of molecules of between 200 and 400 bp. The Kc0% cell distribution differs mainly from that of embryos in that 48% of the molecules have a size between 4 and 8 kb. Correlating with this, circular molecules homologous to copia, 412 and 297 were detected only in Kc0% cells. The three tandemly repeated families containing the 5S genes, the histone genes and the 240 bp repeat of the ribosomal DNA intergenic spacer, which had previously been identified in circular DNAs from embryos, were also found in cultured cells. A fourth tandemly repeated family corresponding to the 1.688 g/cm3 satellite DNA was detected, both in embryos and Kc0% cells. It consists of circular multimeric molecules containing multiple copies of the 359 bp repeated unit. No circular DNA molecules homologous to the actin genes, the type I ribosomal DNA insertion, or the F and I transposable elements were found in embryos or Kc0% cells. Thus it appears that the extrachromosomal circular DNA molecules from embryos and from tissue culture cells differ mainly in the presence of circular copies of the copia-like transposable elements.
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87
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Ferry D, Castrillejo Y, Picard G. Acidity and purification of the molten zinc chloride (33.4 mol%)-sodium chloride (66.6 mol%) mixture. Electrochim Acta 1989. [DOI: 10.1016/0013-4686(89)87004-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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88
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Ferry D, Castrillejo Y, Picard G. Zinc metal electrodeposition reaction process in ZnCl22NaCl melt. Electrochim Acta 1988. [DOI: 10.1016/0013-4686(88)80239-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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89
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Huot J, Picard G. A Simplified Method for Assessment of Caribou Body Composition. J Wildl Manage 1988. [DOI: 10.2307/3800916] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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90
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Pont G, Degroote F, Picard G. Illegitimate recombination in the histone multigenic family generates circular DNAs in Drosophila embryos. Nucleic Acids Res 1988; 16:8817-33. [PMID: 3140219 PMCID: PMC338637 DOI: 10.1093/nar/16.18.8817] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
From extrachromosomal covalently closed circular DNA molecules purified from Drosophila melanogaster embryos, we have isolated 24 clones homologous to the histone tandemly repeated gene family. Some of the clones harbor one of the two main types of genomic repeated units of 4.8 and 5.0 kb. and probably result from homologous recombination. The remaining clones have a size ranging from 0.2 to 2.5 kb. and most of them carry a single fragment of the repeated unit. Nucleotide sequences of the junction region of six of these clones indicate they are generated by illegitimate recombination between short (8-15 bp.) imperfect direct repeats. The data suggest that most of the histone homologous circular DNA molecules are deleted histone units.
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91
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Frackowiak D, Erokhina LG, Picard G, Leblanc RM. POLARIZED OPTICAL PROPERTIES OF PHYCOBILISOMES FROM Anabaena, Nostoc and Synechococcus. Photochem Photobiol 1987. [DOI: 10.1111/j.1751-1097.1987.tb04767.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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92
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Pont G, Degroote F, Picard G. Some extrachromosomal circular DNAs from Drosophila embryos are homologous to tandemly repeated genes. J Mol Biol 1987; 195:447-51. [PMID: 3116263 DOI: 10.1016/0022-2836(87)90665-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In Drosophila melanogaster embryos we have identified three classes of extrachromosomal circular DNA molecules homologous to the three main families of tandemly repeated genes, 5 S, rDNA and histone. 5 S genes are present in circular multimeric molecules containing up to 16 copies of the 375(+/- 7) base-pair repeated unit. Circular molecules homologous to rDNA are also multimeric molecules, which contain up to ten copies of the 240 base-pair tandemly repeated sequence of the non-transcribed spacer. The two major genomic classes of histone units (4800 and 5000 bases) are found only as monomeric circular molecules. No circular intermediate of the I transposable element was detected in embryos laid by F1 dysgenic females produced by the I-R system of hybrid dysgenesis. As far as we know, it is the first time that genes have been identified among extrachromosomal circular molecules independently of any specific amplification phenomenon.
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93
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Picard G, Barandun J. [Thoughts on the process of specializing in general surgery]. Ther Umsch 1986; 43:481-4. [PMID: 3750220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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94
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Martin C, Picard G, Noüe J. Epuration biologique du lisier de porc par production de biomasses d'algues unicellulaires. ACTA ACUST UNITED AC 1985. [DOI: 10.1007/bf01742582] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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95
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de la Noüe J, Cloutier-Mantha L, Walsh P, Picard G. Influence of agitation and aeration modes on biomass production by Oocystis sp. grown on wastewaters. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0144-4565(84)90034-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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96
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Weber S, Donzeau-Gouge GP, Chauvaud S, Picard G, Guerin F, Carpentier A, DeGeorges M. Assessment of plexectomy in the treatment of severe coronary spasm in patients with normal coronary arteries. Am J Cardiol 1983; 51:1072-5. [PMID: 6837449 DOI: 10.1016/0002-9149(83)90347-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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97
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Rey E, El-Assaf HD, Richard MO, Weber S, Bourdon A, Picard G, Olive G. Pharmacological interaction between nitroglycerin and aspirin after acute and chronic aspirin treatment of healthy subjects. Eur J Clin Pharmacol 1983; 25:779-82. [PMID: 6420164 DOI: 10.1007/bf00542519] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The interaction between nitroglycerin (NTG) and aspirin was investigated in 7 healthy subjects in order to test whether aspirin could block the haemodynamic response to NTG; the doses used were NTG 0.8 mg, and aspirin 0.5 g for chronic and 1 g for acute treatment. The plasma levels of NTG and various physiological parameters (heart rate, diastolic arterial pressure, end diastolic diameter, and end systolic diameter) were measured during the 30 minutes after the administration of NTG. An increase in NTG Cmax and AUC was observed after both aspirin treatment. The changes in physiological parameters produced by NTG were enhanced by the two treatments, although the differences were not statistically significant. The results indicate complex pharmacokinetic and pharmacodynamic interactions between NTG and aspirin.
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98
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Picard G, Seon F, Bertaud Y. A molten salt potentiometric method for characterizing industrial aluminas. Electrochim Acta 1982. [DOI: 10.1016/0013-4686(82)85013-5] [Citation(s) in RCA: 6] [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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99
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Picard G, Seon F, Tremillon B, Bertaud Y. Effect of the addition of fluoride on the conditional solubility of alumina in LiCl-KCl eutectic melt. Electrochim Acta 1980. [DOI: 10.1016/0013-4686(80)87161-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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100
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Bregliano JC, Picard G, Bucheton A, Pelisson A, Lavige JM, L'Heritier P. Hybrid dysgenesis in Drosophila melanogaster. Science 1980; 207:606-11. [PMID: 6766221 DOI: 10.1126/science.6766221] [Citation(s) in RCA: 102] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Several dysgenic traits may occur within the Drosophila melanogaster species as a result of crosses between different strains. Crossing two mutually interacting categories, named inducer and reactive, may lead, among other abnormalities, to a specific kind of female sterility that has proved useful for investigating the genetic factors involved in the interaction. The reactive state appears to result from a cytoplasmic state ultimately controlled by a chromosomal polygenic system. The inducer character is determined by a chromosomal factor that exhibits all characteristics of a transposable element. Overall, the data contribute to clarification of mutator activities in D. melanogaster and open new opportunities to investigate unusual genetic mechanisms.
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