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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for RNA transport in rat optic nerve (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 16 (1969), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1969.tb08995.x
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  • 2
    Electronic Resource
    Electronic Resource
    ACTIVITIES OF 3,4-DIHYDROXY-l-PHENYLALANINE AND 5-HYDROXY-l-TRYPTOPHAN DECARBOXYLASES IN RAT BRAIN: ASSAY CHARACTERISTICS AND DISTRIBUTION (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 20 (1973), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Optimal assay conditions for decarboxylation of 3,4-dihydroxy-l-phenylalanine (DOPA) and 5-hydroxy-l-tryptophan (5-HTP) were determined in homogenates of rat brain by use of a sensitive, precise microradiometric technique. The two activities exhibited widely different optima for pH, temperature and substrate concentrations. The activity of 5-HTP decarboxylase was stimulated 2-fold by added pyridoxal-5-phosphate and was relatively resistant to antagonists of pyridoxal-P. By contrast, the activity of DOPA decarboxylase was stimulated 20-fold by added coenzyme and could be completely inhibited by carboxyl trapping agents. DOPA decarboxylase activity in subcellular fractions of brain was associated predominately with the soluble fractions and its distribution in the various fractions closely paralleled that of lactic acid dehydrogenase. 5-HTP decarboxylase activity in brain was distributed almost equally between soluble and particulate fractions, and its distribution within the particulate fractions differed from that of succinic acid dehydrogenase. The two decarboxylases in brain exhibited a 7-fold divergence in relative specific activity when their respective distributions in subcellular fractions were compared. Similarly, the regional distributions of the two decarboxylases in rat brain did not parallel one another; e.g. there was a 4-fold difference between the ratio of the two activities in cerebellum and that found in the corpus striatum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1973.tb12144.x
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  • 3
    Electronic Resource
    Electronic Resource
    Thermally stimulated persistent conductivity in n-AlGaAs/GaAs heterostructures (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 939-941 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new phenomenon, thermally stimulated persistent conductivity, has been observed in n-Al0.3Ga0.7As/GaAs heterostructures. After a heterostructure is cooled from room temperature to low temperatures (120–140 K), the electron concentration and mobility do not stay constant with time. Electron concentration decreases slowly (days), while Hall mobility increases. This effect is attributed to the slow transfer of electrons from the two-dimensional electron gas formed at the heterointerface into deep donors in the AlGaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339704
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  • 4
    Electronic Resource
    Electronic Resource
    Point-of-use arsine generation for organometallic vapor-phase epitaxial growth (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1185-1189 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technique for the continuous generation of arsine as required for organometallic vapor-phase epitaxial growth is described. Arsine is generated through the reduction of arsenic trichloride by lithium tetrahydridoaluminate in a nonvolatile ether. Reaction conditions appropriate for steady-state operation, necessary for this application, have been established. Arsenide conversion efficiencies in excess of 95% have been consistently demonstrated with arsine flows up to 100 μmol/min. GaAs grown using generated arsine exhibits a 77-K carrier concentration of 1.29×1015 cm−3 and mobility of 33 000 cm2/V s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343460
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  • 5
    Electronic Resource
    Electronic Resource
    The formation and distribution of ice within dormant and deacclimated peach flower buds (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A freeze-fixation technique was used to examine the distribution of ice crystals and the pattern of freezing in peach flower buds. In dormant buds, ice crystals formed at localized sites within the bud axis and scales. Ice crystal formation disrupted tissues and mechanical injury from repetitive freezethaw cycles was apparent. There was evidence of ice formation in the floral organs of dormant buds exposed to −25°C but none observed in buds exposed to either −5 or −10°C. The distribution of ice crystals was different in deacclimated buds. In addition to large ice crystals within the subtending bud axis and scales, evidence of large crystals within the developing floral organs was noted. These crystals were most prominent in the lower portions of the developing flower and peduncle, and caused a separation of the epidermal layer from adjacent cells. The distribution of ice crystals within both dormant and deacclimated peach flower buds corroborated the results of previous thermal analysis experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb02125.x
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  • 6
    Electronic Resource
    Electronic Resource
    Acute-onset nontraumatic paraplegia in childhood: fibrocartilaginous embolism or acute myelitis? (2000)
    Springer
    Child's nervous system 16 (2000), S. 551-554 
    Details
    ISSN: 1433-0350
    Keywords: Keywords Acute myelitis of childhood ; Fibrocartilaginous embolism ; Magnetic resonance imaging ; Spinal cord infarction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Fibrocartilaginous embolus causing acute spinal cord infarction is a rare cause of acute-onset paraplegia or quadriplegia. Few cases of survivors have been reported in the neurosurgical literature, with most reports involving post-mortem or biopsy findings. There is little information on MRI findings in such patients. We present the youngest patient ever reported, and discuss the important differences between fibrocartilaginous embolus and acute myelitis of childhood. A 6-year-old girl with a history of back pain presented with sudden-onset nontraumatic paraplegia, with a clinical anterior spinal artery syndrome. Initial MRI scan revealed intervertebral disc disease at L1–2 and an incidental thoracic syrinx, but no cause for her acute-onset paraplegia was identified. Cerebrospinal fluid and other investigations were all negative. Sequential MRI scans revealed development of spinal cord expansion from T10 to the conus medullaris, with increased cord signal in the anterior aspect of the spinal cord. The intervertebral disc disease was unchanged. The imaging and clinical findings were caused by fibrocartilaginous embolus, which meant there was no need for spinal cord biopsy. The report describes the clinical and imaging criteria for diagnosis of fibrocartilaginous embolus, highlighting the case for avoiding an unnecessary biopsy. The clinical pattern in the paediatric group is discussed, with features differentiating it from acute myelitis of childhood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003810000268
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  • 7
    Electronic Resource
    Electronic Resource
    Quantitative sampling of indoor air biomass by signature lipid biomarker analysis (1999)
    Springer
    Journal of industrial microbiology and biotechnology 22 (1999), S. 80-87 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: airborne bacteria; phospholipid fatty acids; human health
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Exposure to airborne biocontaminants may result in a multitude of health effects and is related to a pronounced increase in adult-onset asthma. Established culture-based procedures for quantifying microbial biomass from airborne environments have severe limitations. Assay of the phospholipid fatty acid (PLFA) components of airborne microorganisms provides a quantitative method to define biomass, community composition and nutritional/physiological activity of the microbial community. By collecting airborne particulate matter from a high volume via filtration, we collected sufficient biomass for quantitative PLFA analysis. Comparing high (filtration) and low (impaction) volume air sampling techniques at 26 locations within the Eastern United States, we determined that PLFA analysis provided a viable alternative to the established but flawed culture-based techniques for measuring airborne microbial biomass and community composition. Compared to the PLFA analysis, the culture techniques underestimated the actual viable airborne biomass present by between one to three orders of magnitude. A case study of a manufacturing plant at which there had been complaints regarding the indoor air quality is presented. Phospholipid fatty acid characterization of the biomass enabled contamination point source determination. In comparison with samples taken outdoors, increases in the relative proportion of trans PLFA, reflecting shifts in the physiological status of viable airborne Gram-negative bacteria, were detected in the indoor air samples at a majority of sampling sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900609
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  • 8
    Electronic Resource
    Electronic Resource
    Impact - effects of fast transient loadings, W. J. Amman, Wing Kam Liu, J. A. Studer and T. Zimmermann (eds) (1990)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 11 (1990), S. 119-120 
    Details
    ISSN: 0271-2091
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650110108
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