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  • correlation functions  (3)
  • Anther dimensions  (2)
  • Bacillus  (2)
  • Springer  (7)
  • 1
    Electronic Resource
    Electronic Resource
    A novel thermostable nitrile hydratase (1998)
    Springer
    Extremophiles 2 (1998), S. 347-357 
    Details
    ISSN: 1433-4909
    Keywords: Key words Thermophile ; Bacillus ; Nitrile hydratase ; Thermostable
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A novel, nitrile-degrading, thermophilic microorganism belonging to the genus Bacillus and most closely related to strain DSM 2349 has been isolated. The strain grew optimally at 65°C with the constitutive expression of a thermostable intracellular nitrile hydratase. No aromatic-specific "benzonitrilase" activity was detected under any conditions. The enzyme, an α2β2 heterotetramer with a native molecular weight of 110 kDa, was purified to homogeneity. N-terminal sequence data showed no homology to known bacterial α subunit sequences but had a high level of identity with other bacterial N-terminal β subunit sequences. The purified enzyme had a broad pH-activity range (50% activity limits were pH 5.1 and 8.7) and was stable in aqueous solution up to 60°C in the absence of either substrates or substrate analogues. Substrate specificity was restricted to aliphatic nitriles, but an unusual preference for branched and cyclic aliphatic nitriles was noted. Turnover rates under optimum reaction conditions were 746 and 4580 sec−1 for acetonitrile and valeronitrile, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007920050078
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  • 2
    Electronic Resource
    Electronic Resource
    Block Renormalization Group Approach for Correlation Functions of Interacting Fermions (1997)
    Springer
    Letters in mathematical physics 42 (1997), S. 261-270 
    Details
    ISSN: 1573-0530
    Keywords: block renormalization group ; correlation functions ; ferminos.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Inspired by a decomposition of the lattice Laplacian operator into massive terms (coming from the use of the block renormalization group transformation for bosonic systems), we establish a telescopic decomposition of the Dirac operator into massive terms, with a property named ‘orthogonality between scales’. Making a change of Grassmann variables and writing the initial fields in terms of the eigenfunctions of the operators related to this decomposition, we propose a multiscale structure for the generating function of interacting fermions. Due to the orthogonality property we obtain simple formulas, establishing a trivial link between the correlation functions and the effective potential theories. In particular, for the infrared analysis of some asymptotically free models, the two point correlation function is written as a dominant term (decaying at large distances as the free propagator) plus a correction with faster decay, and the study of both terms is straightforward once the effective potential theory is controlled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007391002152
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  • 3
    Electronic Resource
    Electronic Resource
    Multiscale Formalism for Correlation Functions of Fermions. Infrared Analysis of the Tridimensional Gross–Neveu Model (1999)
    Springer
    Journal of statistical physics 95 (1999), S. 665-692 
    Details
    ISSN: 1572-9613
    Keywords: correlation functions ; fermions ; infrared analysis ; tridimensional Gross–Neveu model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a multiscale formalism for fermionic systems (with a smooth UV cutoff ) establishing a trivial link between the correlation functions and the effective potential flow, and study the k-point truncated functions of the tridimensional Gross–Neveu model. A new efficient method is used to bound these correlation functions and show polynomial tree decay for long distances. We are guided by a block lattice mechanism with a property of orthogonality between terms in different scales, which leads to simple formulas for the correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004547426881
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  • 4
    Electronic Resource
    Electronic Resource
    Genetic and environmental variation in anther, pollen and pistil dimensions in sesame (1996)
    Springer
    Sexual plant reproduction 9 (1996), S. 228-232 
    Details
    ISSN: 1432-2145
    Keywords: Male transmission ; Anther dimensions ; Pollen dimensions ; Pistil dimensions ; Sesame ; Sesamum indicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurements of anther (length, width, depth), pollen grain (percent fertility, polar diameter, equatorial diameter, polar diameter/equatorial diameter ratio, volume) and pistil (stigma length, style length, ovary length, total pistil length, stigma width, style width, ovary width) were taken on 12 diverse sesame (Sesamum indicum L.) genotypes on each of four collection dates in 1994. Highly significant differences among genotype means were obtained for all characters except polar diameter. Highly significant differences among environment (collection date) means were found for ten of the 15 characters measured. Highly significant genotype x environment interactions were obtained for all characters except anther length. For the anther characters measured, relatively high repeatability values were found, ranging from 99.8% for length to 87.6% for depth. For the pollen grain characters measured, the repeatability values ranged from 67.6% for percent fertility to 23.1% for polar diameter. For the pistil characters measured, the repeatability values ranged from 94.0% for style width to 49.6% for total pistil length. These results indicate that genotype and environment influence anther, pollen grain and pistil characters. Variation in some of these morphological aspects could influence the consistency and interpretation of male transmission studies on both the applied and evolutionary levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173103
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  • 5
    Electronic Resource
    Electronic Resource
    Genetic and environmental variation in anther, pollen and pistil dimensions in sesame (1996)
    Springer
    Sexual plant reproduction 9 (1996), S. 228-232 
    Details
    ISSN: 1432-2145
    Keywords: Key words Male transmission ; Anther dimensions ; Pollen dimensions ; Pistil dimensions ; Sesame ; Sesamum indicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Measurements of anther (length, width, depth), pollen grain (percent fertility, polar diameter, equatorial diameter, polar diameter/equatorial diameter ratio, volume) and pistil (stigma length, style length, ovary length, total pistil length, stigma width, style width, ovary width) were taken on 12 diverse sesame (Sesamum indicum L.) genotypes on each of four collection dates in 1994. Highly significant differences among genotype means were obtained for all characters except polar diameter. Highly significant differences among environment (collection date) means were found for ten of the 15 characters measured. Highly significant geno- type × environment interactions were obtained for all characters except anther length. For the anther characters measured, relatively high repeatability values were found, ranging from 99.8% for length to 87.6% for depth. For the pollen grain characters measured, the repeatability values ranged from 67.6% for percent fertility to 23.1% for polar diameter. For the pistil characters measured, the repeatability values ranged from 94.0% for style width to 49.6% for total pistil length. These results indicate that genotype and environment influence anther, pollen grain and pistil characters. Variation in some of these morphological aspects could influence the consistency and interpretation of male transmission studies on both the applied and evolutionary levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050036
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  • 6
    Electronic Resource
    Electronic Resource
    Occurrence of antibiotic resistance among bacilli in Brazilian soils and the possible involvement of resistance plasmids (1986)
    Springer
    Plant and soil 94 (1986), S. 213-226 
    Details
    ISSN: 1573-5036
    Keywords: Antibiotic resistance ; Bacillus ; Brazilian soils ; Plasmids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Numbers of bacilli resistant to each one of 6 antibiotics were determined in samples of 5 different Brazilian soils. In all soils, antibiotic-resistant cells made up only a minor part of the total population of bacilli. Resistance to penicillin (Pc), streptomycin (Sm) and kanamycin (Km) was most frequent in the majority of soils, however, numbers of bacilli resistant to erythromycin (Em) and tetracyclin (Tc) were substantially lower. Chloramphenicol (Cm) resistance showed intermediate levels. Thirty-four strains resistant to either Tc, Em or Cm were isolated and identified to species level. A screening for the presence of extrachromosomal DNA in these strains revealed that 11 carried one or more plasmids in the molecular weight range 2.3–30 Md. A 2.8 Md plasmid, pFT-30, detected inB. cereus, was shown to carry a Tc resistance determinant. The antibiotic resistance of non of 8 other plasmid-containing strains could be linked, with certainty, to the presence of the plasmid. However, preliminary evidence pointed to the localization of Em resistance determinants in 2B. subtilis strains on plasmids of 3.2–3.4 Md.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374345
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  • 7
    Electronic Resource
    Electronic Resource
    Orthogonality between scales and wavelets in a representation for correlation functions. The lattice dipole gas and (∇φ)4 models (1993)
    Springer
    Journal of statistical physics 73 (1993), S. 695-721 
    Details
    ISSN: 1572-9613
    Keywords: Orthogonality between scales ; correlation functions ; block renormalization group ; dipole gas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Exact formulas for the correlation functions of lattice scalar field models in Zd,d⩾3, such as the dipole gas and anharmonic crystal are derived in terms of the effective action generated aftern applications of the block renormalization group transformation. Utilizing the orthogonality between different momentum scales (relations due to the wavelets implicit in the structure of the block renormalization group transformation), the formulas are quite simple, isolate the dominant term, and, in the thermodynamic andn→∞ limits, reduce the analysis to local estimates of the effective action. Based on a large-small field analysis, the two-point function is determined and it is shown how to extend the results to general correlations. The results proved here show the usefulness of the “orthogonality-of-scales” property for the study of correlation functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054346
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