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  • 1995-1999  (25)
  • 1990-1994  (31)
  • 1985-1989  (17)
  • 1950-1954  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Distillation of Micro Quantities of Iodine (1953)
    s.l. : American Chemical Society
    Analytical chemistry 25 (1953), S. 1558-1559 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60082a043
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  • 2
    Electronic Resource
    Electronic Resource
    Phosphorescence Reveals a Continued Slow Annealing of the Protein Core following Reactivation of Escherichia coli Alkaline Phosphatase (1995)
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 1133-1136 
    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/bi00004a005
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  • 3
    Electronic Resource
    Electronic Resource
    Quenching of tryptophan phosphorescence in Escherichia coli alkaline phosphatase by long-range transfer mechanisms to external agents in the rapid-diffusion limit (1991)
    s.l. : American Chemical Society
    Biochemistry 30 (1991), S. 668-675 
    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/bi00217a012
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear optical absorption and dynamics in quantum wells (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1301-1303 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present measurements of differential transmission and four-wave mixing in GaAs quantum well structures at 1.8 K near the inhomogeneously broadened lowest heavy-hole (hh1) exciton resonance using narrow band cw excitation. The data show an increase in absorption and an excitation lifetime of order 1–10 μs outside the spectral hole produced by the pump. The long lifetime and the experimentally determined absence of excitation spatial diffusion in this region suggests that optical absorption produces electron-hole pairs that are correlated but separately localized due to disorder. A phenomenological model is proposed to explain the nonlinear response based on two-photon absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107572
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  • 5
    Electronic Resource
    Electronic Resource
    A microscopic model for the heteromolecular theory of nucleation (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5219-5226 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have extended the microscopic model of homogeneous nucleation to the heteromolecular case. This model, interacting clusters and heteroclusters (ICH), consists of a distribution of heteroclusters and clusters. The interaction between monomers, cluster–monomer, heterocluster–monomer, and heterocluster–heterocluster are taken into account. The method of correlation functions is extended so that configuration integral of the ICH model can be calculated. The concentration of heteroclusters is derived in terms of microscopic quantities. In the limit of no interaction between clusters and heteroclusters, the heterocluster concentration is expressed in terms of monomer concentration, the chemical potential of monomers, and the internal free energy of a heterocluster. In this limit the heterocluster concentration may also be expressed in terms of the total number of ions and the internal free energy of heteroclusters. The formation energy of a heterocluster is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449735
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  • 6
    Electronic Resource
    Electronic Resource
    Median filter behaviour with seismic data (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 43 (1995), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Median filters may be used with seismic data to attenuate coherent wavefields. An example is the attenuation of the downgoing wavefield in VSP data processing. The filter is applied across the traces in the ‘direction’ of the wavefield. The final result is given by subtracting the filtered version of the record from the original record. This method of median filtering may be called ‘median filtering operated in subtraction’. The method may be extended by automatically estimating the slowness of coherent wavefields on a record. The filter is then applied in a time- and-space varying manner across the record on the basis of the slowness values at each point on the record.Median filters are non-linear and hence their behaviour is more difficult to determine than linear filters. However, there are a number of methods that may be used to analyse median filter behaviour: (1) pseudo-transfer functions to specific time series; (2) the response of median filters to simple seismic models; and (3) the response of median filters to steps that simulate terminating wavefields, such as faults on stacked data. These simple methods provide an intuitive insight into the behaviour of these filters, as well as providing a semiquantitative measurement of performance. The performance degradation of median filters in the presence of trace-to-trace variations in amplitude is shown to be similar to that of linear filters. The performance of median filters (in terms of signal distortion) applied obliquely across a record may be improved by low-pass filtering (in the t-dimension). The response of median filters to steps is shown to be affected by background noise levels. The distortion of steps introduced by median filters approaches the distortion of steps introduced by the corresponding linear filter for high levels of noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1995.tb00256.x
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  • 7
    Electronic Resource
    Electronic Resource
    Thapsigargin-coated intraocular lenses inhibit human lens cell growth (1997)
    [s.l.] : Nature Publishing Group
    Nature medicine 3 (1997), S. 1026-1028 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Cataract is responsible for rendering several million people blind throughout the world1 and is also by far the most common cause of low visual acuity. Although cataract surgery is common, routine and effective, posterior capsule opacification (PCO) occurs in 30–50% of patients ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm0997-1026
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  • 8
    Electronic Resource
    Electronic Resource
    Towards systolizing compilation (1991)
    Springer
    Distributed computing 5 (1991), S. 7-24 
    Details
    ISSN: 1432-0452
    Keywords: Distributed parallelism ; Parallelizing compiler ; Systolic array
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Summary A scheme for the compilation of imperative or functional programs into systolic programs is demonstrated on matrix composition/decomposition and Gauss-Jordan elimination. Using this scheme, programs for the processor network Warp and for several transputer networks have been generated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311229
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular mechanisms of poliovirus persistence: key role of capsid determinants during the establishment phase (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 1385-1402 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Virus; poliovirus; picornavirus; mutations; capsid; persistence; receptor.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. As viral persistence is of major medical importance, well-characterized, simple models are needed to improve our understanding of persistent infections. We have chosen to study the molecular mechanisms of viral persistence with the poliovirus (PV), because this picornavirus is one of the best characterized animal viruses, it infects the central nervous system which is a target organ for viral persistence, and it belongs to the Picornaviridae family of viruses, which includes several naturally persisting viruses. We have developed models of PV persistence in neuronal and epidermoid cells, and the present review will focus on the latter one because both lytic and persistent PV strains can be used to study the PV-HEp-2 cell interactions. The viral determinants of persistence have been investigated with this model, and PV determinants have proven to be of crucial importance for the establishment of persistence in HEp-2 cells. Precise determinants of PV persistence have been identified for PV serotypes 1 and 3, in capsid proteins VP1 and VP2. These determinants modify the early steps of the PV cycle, and in particular, the conformational modifications of the capsid following virus adsorption onto its receptor. These results permit us to propose several hypotheses concerning PV persistence and the early steps of the PV cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050261
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  • 10
    Electronic Resource
    Electronic Resource
    A histochemical study of the regional distribution in the rat brain of enzymatic activity hydrolyzing glucose- and 2-deoxyglucose-6-phosphate (1988)
    Springer
    Histochemistry and cell biology 88 (1988), S. 257-262 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A modified Wachstein-Meisel lead salt method using glucose-6-phosphate or 2-deoxyglucose-6-phosphate as substrates was employed at the light microscopic level to map the rat brain for glucose-6-phosphatase (G-6-Pase). As has been described, most of the activity of the enzyme resided in neuronal cell bodies and dendritic stems. No differences were found between the results obtained with the two substrates. Two categories of brain structures with heavy and with moderate staining could be distinguished while the majority of brain regions contained only barely discernible neurons. Structures displaying very high enzyme activity included nuclei of cranial nerves, nuclei of the reticular formation, Purkinje cells, and some parts of the limbic system, e.g., CA 3 and CA 4 pyramidal fields of the hippocampus. It is pointed out that accurate biochemical determinations of G-6-Pase activity will critically depend on pains-taking microdissection of nuclei and cell layers. The histochemical results may be pertinent to the interpretation of the 2-deoxyglucose method for assessment of regional glucose utilization rates in brain. The present observations make it unlikely that regional variations in G-6-Pase activity account for differences in uptake and retention of radioactivity from (1-14C)glucose and (14C)2-deoxyglucose reported previously by our group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570281
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