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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1220-1222 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The low-temperature near-band-edge photoluminescence of thick (d≈36 μm) (100)CdTe epilayers grown on (100)GaAs substrates is investigated. Besides a dominating bound exciton emission, evidence for free-exciton emission (n=1 and 2) and two electron transitions (TETs) of donor-bound excitons is found. The defect involved in the TET is most likely a gallium-related donor. This is concluded from the TET line wavelength adopting recent bulk CdTe TET data. A new emission line at 781.4 nm (1586.7 meV) is observed. It is tentatively assigned to a TET of a free exciton.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of nondestructive evaluation 8 (1989), S. 37-43 
    ISSN: 1573-4862
    Keywords: remote field ; eddy current ; magnetic saturation ; stress corrosion cracking ; finite element calculations ; skin depth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The remote field eddy current (RFEC) technique is of potential interest for inspecting pipelines for stress corrosion cracking. Magnetic saturation techniques would allow higher operating frequencies and scanning speeds to be used. The use of selectively-saturated regions (windows) near the exciter and detector offers additional advantages. Finite element, analytic, and experimental measurements are presented in this paper. They show that, while saturation techniques are helpful, the effects are less than initially estimated from simple skin depth approximations.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-1803
    Keywords: angiogenesis ; collateral circulation ; swine heart ; coronary stenosis ; myocardial infarction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We chronically implanted hygroscopic occluders around the left circumflex coronary artery in 49 mesthetized young male domestic pigs and we studied the development of a collateral circulation at 4, 8, 12, and 26 weeks after implantation. At these time intervals groups of animals were again anesthetized, the hearts were explanted and perfused in Langendorff-fashion with leucocyte-filtered pig blood. Maximal coronary vasodilation was induced with adenosine and global (electromagnetic), and regional (tracer microspheres) blood flow was measured at 40, 60, 80, and 100 mm Hg of perfusion pressure. At 4 weeks after occluder implantation maximal left circumflex collateral blood flow was about 20% of normal maximal flow. Collateral flow rose, to 60% of maximal normal flow between 4 and 8 weeks and did not improve further with longer time intervals. In contrast to the canine heart numerous small vessels develop in response to ischemia in the pig heart. These vessels develop throughout the entire risk region with a slight preference for the subendocardium. They appear on tomographic angiograms as a dense “blush”. The study of the relationship between peripheral coronary pressure vs collateral flow showed a relationship much steeper than that of normal maximal flow vs aortic perfusion pressure which indicates that the minimal resistance of the risk region was decreased as part of the mechanism to ensure adequate blood supply in a situation of progressive coronary narrowing.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-0743
    Keywords: myocardial perfusion ; coronary flow reserve ; densitometry ; digital subtraction angiocardiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary From densitometric evaluation of digital subtraction cineangiocardiograms the parameter ‘Mean Rise Time’ (MRT), defined as the time from the onset of local myocardial contrast medium opacification to the point of maximal opacification can be derived; this parameter revealed a close correlation with the results on myocardial perfusion obtained by Thallium-201 scintigraphy. A prolonged ‘Mean Rise Time’ was indicative of an impairment of myocardial perfusion. We have developed a heart-phase gated real-time digitization procedure and computer-supported method for the densitometric estimation of the MRT to obtain information about the effect of coronary balloon dilatation on myocardial perfusion before and after stimulation of coronary flow reserve by Moxaverin. In 22 patients with single vessel coronary artery disease Moxaverin caused a significant prolongation of the post-stenotic MRT (2.3±1.2s (mean ± s.d.) vs. 2.9±1.1s, p〈0.05), while after successful dilatation of the obstructive lesion a significant shortening of the MRT was found after stimulation of the coronary flow reserve (2.5±1.2s vs. 1.9±0.9s, p〈0.05). A highly significant decrease in MRT after Moxaverin was measured post-dilatation in comparison to the initial pre-dilatation results (2.9±1.1s vs. 1.9±0.9s, p〈0.005); this shows that the effect of successful balloon dilatation on the post-stenotic myocardial perfusion can be described very well by this parameter. These results demonstrate that information about post-stenotic myocardial perfusion during interventional heart catheterization can be obtained from digital densitometry.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 2 (1987), S. 167-176 
    ISSN: 0887-3585
    Keywords: icosahedral ; insect ; virus ; structure ; evolution ; nodavirus ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: We report the first atomic resolution structure of an insect virus determined by single crystal X-ray diffraction. Black beetle virus has a bipartite RNA genome encapsulated in a single particle. The capsid contains 180 protomers arranged on a T = 3 surface lattice. The quaternary organization of the protomers is similar to that observed in the T = 3 plant virus structures. The protomers consist of a basic, crystallographically disordered amino terminus (64 residues), a β-barrel as seen in other animal and plant virus subunits, an outer protrusion composed predominantly of β-sheet and formed by three large insertions between strands of the barrel, and a carboxy terminal domain composed of two distorted helices lying inside the shell. The outer surfaces of quasi-threefold related protomers form trigonal pyramidyl protrusions. A cleavage site, located 44 residues from the carboxy terminus, lies within the central cavity of the protein shell.The structural motif observed in BBV (a shell composed of 180 eight-stranded antiparallel β-barrels) is common to all nonstatellite spherical viruses whose structures have so far been solved. This highly conserved shell architecture suggests a common origin for the coat protein of spherical viruses, while the primitive genome structure of BBV suggests that this insect virus represents an early stage in the evolution of spherical viruses from cellular genes.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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