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  • 1
    Electronic Resource
    Electronic Resource
    Favorskii rearrangements of .alpha.-halogenated acetylcycloalkanes. 3 (1982)
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 4485-4491 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00144a017
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of lateral npn- and pnp-structures on Si/SiGe by focused laser beam writing and their application as photodetectors (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6455-6460 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Local doping with focused laser beam writing was used to fabricate lateral npn- and pnp-structures on modulation-doped Si/SiGe heterostructures. The electrical and optical properties of the achieved lateral potential modulation were analyzed for local B-doping on n-type Si/SiGe and P- and Sb-doping on p-type SiGe/Si. Focused laser beam written doped lines show a strongly nonohmic IV characteristic indicating the formation of a local insulating barrier in the two-dimensional carrier system. Such lateral structures can be used as photosensitive devices with responsivities up to 106 A/W combined with a spatial resolution on the μm scale. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364428
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  • 3
    Electronic Resource
    Electronic Resource
    Franz–Keldysh effect in lateral GaAs/AlGaAs based npn structures (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2876-2878 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lateral npn structures, fabricated by focused laser beam-induced doping, combine large potential modulations with a small width of the p-doped regions. This results in strong lateral electric fields, which can be tuned by applying a bias voltage. Photon absorption for energies below the band gap is allowed due to the Franz–Keldysh effect. We estimate the value of the electric fields by analyzing wavelength-dependent photocurrent measurements. The fields are comparable to attainable fields in existing vertical modulator structures. The spatially resolved photocurrent measurements reveal the location of the highest lateral electric field, which is at the edges of the p-doped region. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119204
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  • 4
    Electronic Resource
    Electronic Resource
    Fabrication of lateral npn-phototransistors with high gain and sub-μm spatial resolution (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 751-753 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel kind of phototransistor with high gain and sub-μm spatial resolution is fabricated by focused laser beam-induced Zn doping of an n-modulation doped GaAs/Al0.4Ga0.6As quantum well structure. To produce this lateral npn-structure, p-doped lines are directly written over a mesa without degrading the quality of the sample. The local Zn doping causes an effective potential barrier for electrons. Photogenerated holes reduce this barrier and amplify the thermionic electron current. Spatially resolved photocurrent measurements show typical responsivities above 103 A/W and linewidths as small as 605 nm. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114082
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of n- and p-channel in-plane-gate transistors from Si/SiGe/Ge heterostructures by focused laser beam writing (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3025-3027 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Focused laser beam writing is applied for thermally activated diffusion of dopants into strained Si/Ge modulation-doped heterostructures. Lateral p- and n-type potential barriers of sub-μm width are achieved by local diffusion of boron and antimony into n- and p-type heterostructures, respectively. The potential modulation is determined from the temperature dependence of the thermionic current over the barrier. These npn and pnp structures can be used to fabricate in-plane-gate transistors which show transistor action up to room temperature. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115565
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  • 6
    Electronic Resource
    Electronic Resource
    On the voltage stability of lateral barriers in in-plane-gated structures (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 76-78 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lateral barriers in a two-dimensional electron gas were fabricated by laser-induced doping of GaAs/AlGaAs quantum well structures. The barrier heights of these insulating lines were analyzed as a function of voltage by temperature-dependent current measurements. The barrier height saturates for large bias voltages. This is connected with surprisingly high breakdown voltages of the sub-μm lateral barriers. We propose a model for in-plane-gated structures which can explain these effects by taking into account surface leakage currents and surface charges. The lateral band diagram and the barrier height as a function of voltage were calculated self-consistently using this model. The model and the calculations are in good agreement with experimentally determined barrier heights, depletion lengths, and time-dependent leakage currents. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118124
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  • 7
    Electronic Resource
    Electronic Resource
    A removable arc for mounting and recovering flash-cooled crystals (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 29 (1996), S. 208-210 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Macromolecular crystallographic data collection is increasingly and more routinely performed at temperatures around 100 K. At these temperatures, radiation damage is greatly reduced and so the possibility of storing and reusing crystals exists. A simple device for the transfer of cryocooled crystals into and out of the data-collection position is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188989501315X
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  • 8
    Electronic Resource
    Electronic Resource
    Administration of a terpene mixture inhibits cholesterol nucleation in bile from patients with cholesterol gallstones (1987)
    Springer
    Journal of molecular medicine 65 (1987), S. 458-462 
    Details
    ISSN: 1432-1440
    Keywords: Gallstones ; Bile ; Nucleation time ; Cholesterol crystals ; Terpenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Patients with cholesterol gallstones referred to elective cholecystectomy were randomly assigned prior to operation to no treatment (n=14), treatment with one capsule t.d.s. (n=12) or two capsules t.d.s. (n=11) of a terpene mixture (Rowachol). Patients with pigment stones (n=7) or no biliary tract disease (n=5) were also studied. Lipid composition, presence of cholesterol monohydrate crystals, and nucleation time were determined in galbladder bile aspirated during surgery. Cholesterol saturation was similar in the different groups. Crystals were present in all cholesterol gallstone patients without treatment and in none of the controls. In one of the patients treated with one capsule and four of the patients treated with two capsules crystals could not be detected. The terpenes prolonged nucleation time from 2.8 to 5.8 days (one capsule;P〈0.05) and to 9.5 days (two capsules;P〈0.001), respectively; but nucleation did not occur in seven controls. Although the mechanism by which the terpene mixture inhibits the formation of cholesterol crystals in bile was not determined, the findings suggest that the terpene mixture might be a useful agent for a clinical trial to test whether they will prevent recurrence of gallstones after medical dissolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01712838
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  • 9
    Electronic Resource
    Electronic Resource
    A ganglion of the superior tibiofibular joint as a mucoid-cystic degeneration of unusual localization A case report and review of the literature (1998)
    Springer
    Knee surgery, sports traumatology, arthroscopy 6 (1998), S. 62-66 
    Details
    ISSN: 1433-7347
    Keywords: Key words Superior tibiofibular joint ; Ganglion ; Mucoid-cystic ; degeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Notes: Abstract This paper presents the case of a 51-year-old man with a ganglion originating from the superior tibiofibular joint. In the context of the present literature, different theories of the pathogenesis, clinical symptoms, various kinds of imaging methods in regard of the differential diagnosis and the broad spectrum of operative and non-operative treatment are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001670050073
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  • 10
    Electronic Resource
    Electronic Resource
    269. Peri- und intraoperative Besonderheiten bei der Behandlung des Phäochromocytoms (1985)
    Springer
    Langenbeck's archives of surgery 366 (1985), S. 675-675 
    Details
    ISSN: 1435-2451
    Keywords: α-Block ; Volume reexpansion ; Healing by Operation ; α-Blockade ; Volumen Re-Expansion ; Heilung durch Operation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Von 1950 his 1984 wurden 39 Patienten mit einem Phäochromocytom operiert. Letale Komplikationen (2) sind nach Einführung der präoperativen α-Blockade mit Phenoxybenzamin nicht mehr aufgetreten. Auch die typischen perioperativen Kreislaufkrisen sind dank der obligaten präoperativen Re-Expansion des intravasalen Volumens nur noch in leichter, rasch kompensierbarer Form beobachtet worden. Neue Möglichkeiten der topographischen Diagnostik — Sonographie, CT, Szintigraphie mit MIBG — haben das frühere Problem der variablen Lokalisation des Tumors gelöst.
    Notes: Summary From 1950 to 1984, 39 patients with pheochromocytoma have been operated on. Then were two cases of lethal complications, but no more occurred after the introduction of the preoperativeα-block, phenoxybenzamine. Also, the typical perioperative circulation crises due to obligatory preoperative reexpansion of the intravascular volume were observed in a slighter form, which was more quickly compensated for. New method of topographic diagnostics, i.e., ultrasonics, CT, scanning with MIBG, have solved the previous problem with this tumor its variable localization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01836867
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