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  • 1995-1999  (68)
  • 1970-1974  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Inhibition and kinetic mechanism of rabbit muscle glyceraldehyde-3-phosphate dehydrogenase (1972)
    s.l. : American Chemical Society
    Biochemistry 11 (1972), S. 102-109 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00751a018
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics and the mechanism of action of adenosine aminohydrolase (1972)
    s.l. : American Chemical Society
    Biochemistry 11 (1972), S. 3386-3392 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00768a011
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of volcanic glasses from the NMR-EPR perspective: a preliminary application to the Neapolitan Yellow Tuff (1999)
    Springer
    Bulletin of volcanology 60 (1999), S. 425-431 
    Details
    ISSN: 1432-0819
    Keywords: Key words Nuclear magnetic resonance ; Electron paramagnetic resonance ; Volcanic glasses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Glass samples from alkali-trachytic pumice of the Lower Member (LM, level LM1) and Upper Member (UM) of the Neapolitan Yellow Tuff at Campi Flegrei Caldera were studied by nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopy. The EPR data show that the relative occupancy of the different iron sites varies in samples from the Lower Member LM1 and Upper Member of the eruptive sequence. The LM1 glasses are characterized by a more homogeneous distribution of the cationic site population of iron compared with UM and by a different Fe3+/Al3+ substitution in the C2v symmetrical sites of the silicate framework. 29Si MAS NMR spectra on glasses indicate that LM1 glasses are more depolymerized than UM glasses, indicating the existence of structurally distinct magma batches. 27Al MAS NMR spectra indicate the occurrence in UM glasses of aluminum in both tetrahedral and octahedral coordination; the observed AlVI is believed to be a primary feature of the glass, since 27Al CP-MAS NMR experiments do not reveal detectable esa-hydrated Al. The Al in sixfold coordination could be ascribed either to the more abundant alkali–OH terminations in UM, in which alkalies would be extracted from their charge-balance role for Al, thus altering its fourfold structural position, or to permanent compaction during fast cooling and decompression of high-pressure melts. 23Na CP-MAS NMR experiments indicate the existence of Na–OH groups in both LM1 and UM glasses, relatively more abundant in the latter. Although preliminary, the results indicate the possible application of atomic-scale studies to variables that determine the regimes of explosive volcanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050242
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  • 4
    Electronic Resource
    Electronic Resource
    Deformational features of the Ustica volcanic island in the Southern Tyrrhenian Sea (Italy) (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 7 (1995), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Macro- and meso-structural analyses of the Ustica rock formations lead to an interpretation of most of the deformational features that define the structural framework of the island. A regime of sinistral transtension seems to be the best explanation for the most significant fault associations. This regime is consistent with the kinematic model for the Tyrrhenian back-arc-accretionary wedge system proposed by Doglioni (1991). A caldera collapse in the northern part of the island provides the major source of volcanotectonic deformation while cracks, open or filled by clastic and/or volcanic material, were formed by downslope block sliding mostly along the southern coastline. Joints in indurated surge deposits were generated by brittle deformations induced by gravity after deposition, rather than by tectonism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1995.tb00711.x
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  • 5
    Electronic Resource
    Electronic Resource
    Bulk density calibration for X-ray tomographic analyses of marine sediments (1999)
    Springer
    Geo-marine letters 19 (1999), S. 270-274 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A calibration procedure is presented for generating bulk density profiles of intact marine sediment cores using X-ray computed tomography (CT). Developed using both artificial and natural marine sediment samples, the correlation is strong with an R 2 value of 0.98. Similar experiments with carbonate sediments were also strongly linear, but offset from the terrigenous curve, illustrating the influence of sediment chemistry on scanner response. Comparison between newly computed densities for both sediment types with those from individually calibrated cores during our previous CT studies reveals good correspondence between the data sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003670050118
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  • 6
    Electronic Resource
    Electronic Resource
    Environmental overview of Eckernförde Bay, northern Germany (1996)
    Springer
    Geo-marine letters 16 (1996), S. 140-147 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract This environmental overview of Eckernförde Bay (northern Germany) summarizes the results of previous studies relevant to the Office of Naval Research's Coastal Benthic Boundary Layer (CBBL) Baltic field exercise conducted during 1993–1994. Significant environmental characteristics include the following: (1) surface sediment distribution is related to water depth, dictated primarily by hydrodynamic reworking of older glacial deposits; (2) the origin and characteristics of small-scale sedimentary structures depend on storm-generated waves and currents; (3) the proximity of the sea surface and sediment —water interface results in a pelagic—benthic coupling that drives biogeochemical processes and produces organicrich, acoustically turbid sediments; and (4) the bay floor is complicated topographically by pockmarks and manmade sedimentary structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204501
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  • 7
    Electronic Resource
    Electronic Resource
    X-ray tomographic analysis of sediment macrostructure in Eckernförde Bay, western Baltic Sea (1996)
    Springer
    Geo-marine letters 16 (1996), S. 232-239 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract X-ray computed tomography analysis of sediment cores from Eckernförde Bay (western Baltic Sea) indicates that the primary macrostructures and sources of physical property variability are feeding pockets and laminae. Burrowing produces easily discernible macrostructures, yet has a nominal effect overall on sediment property variability. Grain-size distribution is a dominant parameter determining the sediment macrostructure—physical property relationship: the largest variation in sediment properties was associated with sandy sediment and the smallest with muds. However, equally significant is the sorting or spatial distribution of grains within a particular sediment horizon, i.e., whether spatially uniform or patchy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204514
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  • 8
    Electronic Resource
    Electronic Resource
    Book reviews (1996)
    Springer
    Geo-marine letters 16 (1996), S. 330-333 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245565
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  • 9
    Electronic Resource
    Electronic Resource
    HPLC analysis of boldine in pharmaceuticals (1997)
    Springer
    Chromatographia 44 (1997), S. 619-622 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Boldine in pharmaceuticals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is proposed for extraction, separation, identification and quantitative measurement of boldine (I) in pharmaceuticals. The extraction of (I) from the matrix (syrups, tablets, extracts) was realized with aqueous ammonium chloride (0.02 M, pH=3.0 with perchloric acid) and the clean-up of the extract was performed by solid-phase extraction by means of cartridges containing a strong cation-exchange sorbent, from which (I) was eluted with aqueous ammonium chloride (1 M, pH=10.0 with ammonia). The final eluate was examined by HPLC. Chromatography was performed on a C-8 column with a gradient elution from 15:85 to 30:70 of acetonitrile-water containing 0.1 M sodium perchlorate (pH=3.0), in 20 min. A diode array detector was used at 302 nm for detection. The method gives recovery values greater than 98% and the reproducibility is within 6.0%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466665
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  • 10
    Electronic Resource
    Electronic Resource
    HPLC determination of rhodamine B (C.I. 45170) in cosmetic products (1996)
    Springer
    Chromatographia 43 (1996), S. 76-78 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Rhodamine B in cosmetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is proposed for the extraction, separation, identification and quantitative measurement of rhodamine B in cosmetics samples The colour is extracted with a solution of orthophosphoric acid in either water or DMF (depending on the type of cosmetic) adsorbed on a polyamide column, and then eluted with water and methanol. Further clean-up of the extract is performed by means of a Bond Elut C-18 cartridge, from which rhodamine B is eluted with methanol-water (8∶2). The final eluate is examined by HPLC. Chromatography is performed on a C-18 column with a gradient elution from 50∶50 to 70∶30 of acetonitrile-water, containing 0.1 M sodium perchlorate, in 15 min. A diodearray detector enables peak purity analysis. The method gives recovery values of approximately 90%, or better, and the reproducibility is within 4%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272825
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