Search Results - (Author, Cooperation:L. F. Garcia)

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  1. 1
    D. Reich ; N. Patterson ; D. Campbell ; A. Tandon ; S. Mazieres ; N. Ray ; M. V. Parra ; W. Rojas ; C. Duque ; N. Mesa ; L. F. Garcia ; O. Triana ; S. Blair ; A. Maestre ; J. C. Dib ; C. M. Bravi ; G. Bailliet ; D. Corach ; T. Hunemeier ; M. C. Bortolini ; F. M. Salzano ; M. L. Petzl-Erler ; V. Acuna-Alonzo ; C. Aguilar-Salinas ; S. Canizales-Quinteros ; T. Tusie-Luna ; L. Riba ; M. Rodriguez-Cruz ; M. Lopez-Alarcon ; R. Coral-Vazquez ; T. Canto-Cetina ; I. Silva-Zolezzi ; J. C. Fernandez-Lopez ; A. V. Contreras ; G. Jimenez-Sanchez ; M. J. Gomez-Vazquez ; J. Molina ; A. Carracedo ; A. Salas ; C. Gallo ; G. Poletti ; D. B. Witonsky ; G. Alkorta-Aranburu ; R. I. Sukernik ; L. Osipova ; S. A. Fedorova ; R. Vasquez ; M. Villena ; C. Moreau ; R. Barrantes ; D. Pauls ; L. Excoffier ; G. Bedoya ; F. Rothhammer ; J. M. Dugoujon ; G. Larrouy ; W. Klitz ; D. Labuda ; J. Kidd ; K. Kidd ; A. Di Rienzo ; N. B. Freimer ; A. L. Price ; A. Ruiz-Linares
    Nature Publishing Group (NPG)
    Published 2012
    Staff View
    Publication Date:
    2012-07-18
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Americas ; Asia ; Cluster Analysis ; Emigration and Immigration/*history/statistics & numerical data ; Gene Flow ; Genetics, Population ; History, Ancient ; Humans ; Indians, North American/*genetics/*history ; Models, Genetic ; *Phylogeny ; Polymorphism, Single Nucleotide/genetics ; Siberia
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1432-2242
    Keywords:
    Barley genetics ; Quantitative gene expression ; Ideotype ; Mutants
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Summary Three mutants induced in the two-rowed barley variety Beka and their three binary recombinants have been used in an attempt to define an ideotype suitable for Mediterranean agroclimatic conditions. Physiological methods (classical plant growth analysis) together with the study of genotype x environment interaction for grain yield were used to characterize the genotypes. That characterization brought out the huge phenotypical variation produced by only three mutant genes, suggesting that single Mendelian genes may alone explain the quantitative variation, including grain yield, without the necessity of using the polygenic concept. The genotype best adapted to the environments studied is later in heading and has shorter straw and denser spikes than Beka; it also has higher inverse of leaf area rate and grain: leaf area ratio, a lower rate of leaf senescence, and a shorter grain filling period than the original variety.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00224189

    Articles: DFG German National Licenses
  3. 3
    Garcia, L. F. ; Aaron, J. J.
    Springer
    Published 1997
    Staff View
    ISSN:
    1436-5073
    Keywords:
    flow injection ; Spectrofluorimetry ; thiabendazole determination ; fuberidazole determination ; water analysis
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Flow-injection analysis (FIA) is proposed for determining thiabendazole (TBZ) and fuberidazole (FBZ) by Spectrofluorimetry. A pH 2 aqueous solution was found to be the optimal solvent for the rapid, precise and sensitive fluorescence analysis of both fungicides. Linear dynamic graphs were established over a concentration range of two orders of magnitude. Limits of detection were 0.7ng/ml for TBZ and 0.1 ng/ml for FBZ. Relative standard deviations were 0.5 and 0.8% for TBZ and FBZ, respectively. The method was applied to the determination of both compounds in spiked river and tap water samples, with satisfactory recoveries.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01242335

    Articles: DFG German National Licenses
  4. 4
    Murillo, J. A. ; Lemus, J. M. ; Garcia, L. F.
    Springer
    Published 1993
    Staff View
    ISSN:
    1618-2650
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Summary A new spectrophotometric method has been applied for resolving binary mixtures of cephradine (CED) and clavulanic acid (CA). The method is based on the use of the first derivative of the ratio spectra obtained by dividing the amplitudes, at appropriate wavelengths, of the absorption spectra of the mixtures by those of a standard solution of clavulanic acid for determining cephradine and a standard solution of cephradine for determining clavulanic acid. Beer's law is obeyed for cephradine concentrations up to 56.0 mg/l and for clavulanic acid concentrations up to 32.0 mg/l. The recovery values of cephradine and clavulanic acid in their 6:1 and 1:4 (m/m) mixtures were satisfactory.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00322841

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1615-6102
    Keywords:
    Centromeric structures ; Nuclear bodies ; Plant cells ; RNA processing ; Silver staining-nucleolus organizer proteins
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Summary “Micropuffs” and coiled bodies are two nuclear bodies which have previously been described in a wide range of plant species. In this work, we have demonstrated, by means of ultrastructural cytochemical, autoradiographic and immunocytochemical methods, that the so-called “micropuffs” contain chromatin, which is organized in a supranucleosomal structure, is inactive in transcription, and has no apparent relationship with the nucleolus. These features, as well as the distribution of these structures during the interphase periods, allowed us to conclude that they represent centromeric structures, so, we propose that they be denoted by this name. Coiled bodies show the same silver-staining pattern as the nucleolus organizer (NOR), but do not appear to contain NOR chromatin nor does the early processing of rRNA precursor seem to take place in them. We postulate they are involved in later nuclear RNA processing and storage. This work clarifies some previous misunderstandings with regard to these bodies.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01403381

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1588-2780
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Energy, Environment Protection, Nuclear Power Engineering
    Notes:
    Abstract This paper shows the influence of hardness on the beta backscattering coefficient from heat treated and plastic deformed carbon steel specimens. The observed effect cannot be explained as a change in the chemical composition of the sample (or effective atomic number). In order to explain the observed dependencies, it is necessary to take into account the structural defect and morphological changes of the different phases.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02386683

    Articles: DFG German National Licenses
  7. 7
    Murillo, J. A. ; Lemus, J. M. ; García, L. F.
    Springer
    Published 1994
    Staff View
    ISSN:
    1618-2650
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract First-derivative spectrophotometric method with a “zero-crossing” technique of measurement has been used for the quantification of two-components mixtures of cephalothin and clavulanic acid. As the absorption bands of these drugs overlap, both direct and derivative spectrophotometric methods have been investigated and evaluated by a rigorous statistical analysis of the experimental data. The first-derivative spectrophotometric method was found to be more accurate, direct and reproducible. Beer's law was valid over the concentration range 2.0–28.0 mg/l for both compounds. The detection limits of cephalothin and clavulanic acid, at a 0.05 level of significance, were calculated to be 0.13 and 0.15 mg/l. The method was applied for determining these antibiotics in mixtures, some of them containing inject-able dosage forms of cephalothin, and so to determine both compounds in saline and glucosed physiological sera.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00325654

    Articles: DFG German National Licenses