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  • 1
    Electronic Resource
    Electronic Resource
    A New Pentacyclic Triterpene Acid from Lantana indica (1991)
    s.l. : American Chemical Society
    Journal of natural products 54 (1991), S. 755-758 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50075a003
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  • 2
    Electronic Resource
    Electronic Resource
    Acid Hydrolysis of .kappa.-Carrageenan in a Batch Reactor: Stochastic Simulation of Change of Molecular Weight Distribution with Time (1994)
    s.l. : American Chemical Society
    Biotechnology progress 10 (1994), S. 389-397 
    Details
    ISSN: 1520-6033
    Source: ACS Legacy Archives
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bp00028a008
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  • 3
    Electronic Resource
    Electronic Resource
    Source spectra and RMS acceleration of Mexican subduction zone earthquakes (1990)
    Springer
    Pure and applied geophysics 133 (1990), S. 447-474 
    Details
    ISSN: 1420-9136
    Keywords: Source spectra ; RMS acceleration ; Mexican earthquakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Strong motion (SM) data of six Mexican subduction zone earthquakes (6.4≤M S≤8.1) recorded near the epicentral zone are analyzed to estimate their far-field source acceleration spectra at higher frequencies (f≥0.3 Hz). Apart from the usual corrections such as geometrical spreading (1/R), average radiation pattern (0.6), free surface amplification (a factor of 2), and equal partitioning of the energy into two orthogonal horizontal components (a factor of 1/ $$\sqrt 2 $$ ), the observed spectra are corrected for a frequency dependentQ(Q=100f), a site dependent filter (e −πkf ), and amplification ofS waves near the surface (a factor of about 2 atf≥2Hz). We takeR as the average distance from the rupture area to the site. If we model the high frequency plateau (f≥1 Hz) of the source spectra, by a point source ω−2-model, and interpret them in terms of Brune's model we obtain δσ between 50 and 100 bars for all earthquakes. The low-frequency broadband teleseismicP wave spectra, corrected witht *=1.0 s, agrees within a factor of two with SM source spectra near 1 Hz. The ω−2-model is inadequate to explain the observed source spectra in a broad frequency range; these resemble spectra given byGusev (1983) with some differences. SM source acceleration spectra require significant corrections to explain observed spectra and RMS acceleration (arms) (a) at farther coastal sites for extended sources due to directivity effect and (b) at inland sites (100≤R≤200 km) because of unaccounted path and site amplification and/or invalidity of body-wave approximation. The observed spectra and arms at these sites are significantly greater than the predicted values from the estimated source spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878000
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  • 4
    Electronic Resource
    Electronic Resource
    Far-field displacements from a rectangular fault with two rupture velocities (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 990-1006 
    Details
    ISSN: 1420-9136
    Keywords: Earthquake source ; Rupture model ; Rupture velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Analytic expressions for the far-field displacement both in the time and the frequency domains are obtained for the kinematic earthquake model of a rupture which nucleates at a point, grows in the form of a rectangle and stops at a later time. The spectra ofS andP waves are analyzed with the object of determining fault dimensions from the corner frequencies. The approach by which the solution of the present problem is obtained can be extended to get closed form solutions to the problem of rupture front expanding in the form of a polygon and terminating over a fault area which has the form of another polygon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01593045
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  • 5
    Electronic Resource
    Electronic Resource
    Exceptional values of entire and meromorphic functions (1971)
    Springer
    Mathematische Annalen 191 (1971), S. 121-142 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02330565
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  • 6
    Electronic Resource
    Electronic Resource
    Rhizobium sp. exopolysaccharide production, nodulation, and acetylene reduction activity (N2-fixation) in pigeon pea (Cajanus cajan L.) (1991)
    Springer
    Biology and fertility of soils 11 (1991), S. 30-33 
    Details
    ISSN: 1432-0789
    Keywords: Rhizobium spp. ; Bradyrhizobium spp. ; Cajanus cajan ; Pigeonpea ; Exopolysaccharide ; Nodulation ; Acetylene reduction assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary There was no correlation between the quantity of exopolysaccharide produced and acetylene reduction activity by Rhizobium spp. or by Bradyrhizobium spp. (Cajanus). The exopolysaccharide-defective mutants of Rhizobium sp. strain P 116 either failed to nodulate or showed a decrease in effectiveness. The deficiency in exopolysaccharide production was corrected by the addition of purified exopolysaccharide from the parent strain, or from Bradyrhizobium sp. strain P 149 or S24 isolated from pigeonpea (Cajanus cajan) and mungbean (Vigna radiata), respectively. However, the nodules so formed were not fully effective compared to those formed by the parent strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335830
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  • 7
    Electronic Resource
    Electronic Resource
    TRANSCRIPTIONAL CONTROL OF MHC CLASS II ANTIGEN EXPRESSION ON MOUSE T CELL LINES (1986)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 13 (1986), S. 0 
    Details
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We have analysed the factors which regulate MHC class II expression in mouse T cell lines. Two such lines, BW 5147 and PLT-24.2, were used in this study. Using 5-azacytidine (5 AzaC) we have shown that hypomethylation of DNA can induce class II antigen synthesis in BW 5147. The expression of class II in PLT-24.2 cells seems to be under a different control mechanism. Southern blot analysis of I-Aβ gene in PLT-24.2 suggests that the expression of class II in this cell line is probably the outcome of a gene rearrangement. We hypothesise that insertion of viral long terminal repeats (LTR) next to the class II genes in transformed T cell lines can act as a promoter for the expression of class II antigens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1744-313X.1986.tb01100.x
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  • 8
    Electronic Resource
    Electronic Resource
    Bayesian Attenuation Regressions: an Application to Mexico City (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We describe the application of a bayesian linear regression technique to the problem of deriving strong-motion attenuation relations. This approach provides a conceptual framework for the formal incorporation of knowledge about the involved phenomena that comes from sources other than the observed data (prior information, according to the bayesian terminology). the procedure produces numerical solutions that are more stable and rational than those obtained from conventional regression schemes. We illustrate the use of the proposed technique with the derivation of attenuation laws for the Fourier acceleration spectrum, as a function of magnitude and distance, at a hill-zone station in Mexico City.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03936.x
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence for anomalous body-wave radiation between 0.3 and 0.7 Hz from the 1985 September 19 Michoacan, Mexico earthquake (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 101 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In order to better understand the causes of unprecedented damage to Mexico City during the 1985 September 19 Michoacan earthquake (Mw= 8.0) spectral ratios of teleseismic P-waves of this earthquake are studied with respect to those from five recent, large Mexican subduction zone earthquakes (7.0 ≤Mw≤ 7.7). The data are from vertical-component digital seismographs. It is found that the spectral ratios at stations in the NE quadrant are anomalously more energetic than those predicted by the ω−2 source model in the critical frequency range for Mexico City (0.3-0.7 Hz). The evidence is especially convincing for the spectral ratios with respect to the earthquakes of 1985 September 21 (Mw= 7.6) and 1986 (Mw= 7.0) since the data are available from several stations in the NE quadrant. The teleseismic P-wave spectral ratio in this quadrant with respect to the 1985 September 21 earthquake, in the critical frequency range, is close to the acceleration spectral ratio found in and near Mexico City (also in the NE quadrant). Velocity traces in the epicentral region of the Michoacan earthquake, obtained by integrating the accelerograms, also show oscillations with a frequency of about 0.4 Hz. Furthermore, a regression study of Fourier acceleration spectra at a hill-zone site in Mexico City demonstrates that the Michoacan earthquake was anomalously energetic in the city at the critical frequencies for an event of that magnitude and at that distance. If the data from 7.0 ≤Mw≤ 7.7 events can be extrapolated to estimate the ground motions from Mw≥ 8.0 earthquakes, then the evidence, supports an anomalously large body-wave radiation towards Mexico City between 0.3 and 0.7 Hz during the Michoacan earthquake. This anomalous radiation and the dramatic local amplification of seismic waves in the lake-bed zone of the city (∼ 10–50 times at frequencies between 0.3 and 0.7 Hz) appear to be the principal natural causes of the disaster. The anomalous teleseismic P-wave spectral ratios with respect to the earthquakes of 1985 September 21 and 1986 found in the NE quadrant are not observed in the data available from a small number of stations in the other quadrants. If this observation is true then it suggests a directional property to the anomalous radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb00756.x
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  • 10
    Electronic Resource
    Electronic Resource
    Growth, transport, and magnetic properties of Pr0.67Ca0.33MnO3 thin films (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 263-265 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown Pr0.67Ca0.33MnO3 thin films on LaAlO3 using pulsed laser deposition. Below 50 K, a field induced insulator-metal transition results in changes in resistivity of at least 6 orders of magnitude. The field induced conducting state is metastable at low temperature. The temperature dependence of the resistivity exhibits considerable hysteresis in a field of 40 kOe but becomes reversible in a field of 80 kOe. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117944
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