Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 297-298 (Dec. 1998), p. 73-78 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 12 (1969), S. 50-61 
    ISSN: 1432-0533
    Keywords: Neuronal Lipidosis in Adult ; Histochemistry ; Lipofuscin Bodies ; Spleen Glycolipid (Ganglioside)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine 35 jährige Frau starb nach sechswöchiger neurologischer Erkrankung mit Kleinhirnataxie und Unruhebewegungen. Die histologische Untersuchung ergab eine neuronale Lipidose. Schwerer Nervenzellverlust und Gliose fanden sich in Thalamus und Kleinhirnrinde. Trotz fehlender Milzvergrößerung lagen Gruppen großer granulärer Makrophagen in der roten Pulpa. Ähnliche Zellen fanden sich in geringerer Zahl in den Lebersinusoiden. Die histochemischen Reaktionen der geschwollenen Neurone zeigten Abweichungen von den Milzmakrophagen. Das in den Neuronen enthaltene Material verhielt sich histochemisch ähnlich Lipofuscin. Damit übereinstimmend ergab die chemische Analyse keine Vermehrung der Ganglioside. Elektronenoptische Untersuchungen ergaben dichte Lipofuscinkörper und keine membranösen cytoplasmatischen Körper. Das Speichermaterial in der Milz war ein Glykolipid, dessen Färbereaktionen ein Gangliosid vermuten lassen.
    Notes: Summary A 35-year-old woman died after a neurological illness of 6 weeks duration characterized by cerebellar ataxia and involuntary movements. Histological examination proved this to be a case of neuronal lipidosis. Severe nerve cell loss and gliosis were found in the thalamus and cerebellar cortex. Although the spleen was not enlarged, groups of large granular macrophages were observed in the red pulp. Similar cells, in fewer numbers, were also present in the hepatic sinusoids. Histochemical reactions of the swollen neurons differed from those of the splenic macrophages. The material contained in neurons was histochemically similar to lipofuscin. In keeping with these data chemical analysis did not show an increase of ganglioside, and examination with the electron microscope disclosed dense lipofuscin bodies and no membranous cytoplasmic bodies. The material stored in the spleen was a glycolipid, whose staining reactions suggested to be a ganglioside.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 297-298 (Dec. 1998), p. 67-72 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1383-1387 
    ISSN: 0392-6737
    Keywords: III–V semiconductors ; Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; Excitons and related phenomena (including electron-hole drops) ; III–V compounds and systems ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report an experimental study on a large set of InGaAs/GaAs quantum well structures by means of continuous-wave photoluminescence and photoluminescence excitation. The luminescence spectrum at low temperature systematically exhibits a doublet structure whose lineshape is very sensitive to the excitation energy. Accordingly, the excitation spectra detected by monitoring the emission at the two different luminescence peaks have very different profiles, with peaks and/or dips which are not directly related to absorption resonances. As a matter of fact, the anomalies disappear when increasing the temperature or when using an optical bias with energy above the GaAs energy gap. In these cases, the excitation profiles recover the behaviour typical of 2D systems.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3011-3016 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A large set of InGaAs/GaAs quantum well structures was investigated by means of continuous wave photoluminescence (PL) and photoluminescence excitation spectroscopy. Strong photomodulation effects are observed in PL, namely, a strong sensitivity to the excitation energy and strong changes in the line shape when resonant and nonresonant excitations are used together. Correspondingly, the exciton emission exhibits a doublet structure and the excitation spectra, as detected by monitoring the emission at the two peak energies of the PL doublet, show quite different profiles, with peaks and/or dips not directly related to absorption resonances. On the grounds of time-resolved experiments it is shown that band-bending modifications, due to trapping of free carriers at interface defects, account for the observed photomodulation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 13 (1966), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Brain ganglioside pattern was studied in one case of Tay-Sachs’disease, two cases of Late Infantile Amaurotic Idiocy (L.I.A.I.) two cases of Juvenile Amaurotic Idiocy (J.A.I.), three cases of Gargoylism together with three normal adults and one 7-year-old normal child. Our findings in Tay-Sachs’disease conformed with those reported by previous authors. In J.A.I. and L.I.A.I. the percentage distribution of N-acetylneuraminic acid in individual gangliosides has been found to be similar to the normal. No evidence of storage of any single ganglioside has been found in L.I.A.I. All cases of gargoylism showed a clear-cut increase of the two fastest monosialogangliosides.Literature concerning Amaurotic Idiocy and Gargoylism is reviewed and briefly discussed in connection with the present findings.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6542-6544 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coherent dynamics measured by time-resolved four-wave mixing is compared to incoherent population dynamics measured by differential transmission spectroscopy on the ground-state transition at room temperature of two types of InAs-based quantum dots with different confinement energies. The measurements are performed with heterodyne detection on quantum-dot active wave guides to enhance the light–matter interaction length. An elastic nature of the measured dephasing is revealed which is independent of the dot energy level scheme. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2633-2635 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The carrier dynamics in an electrically pumped InAs quantum-dot amplifier emitting near 1.3-μm-wavelength at room temperature is measured with femtosecond time resolution performing a pump–probe and a four-wave mixing experiment resonant to the dot ground–state transition. In contrast to the dynamics of the absorption bleaching over hundreds of picoseconds, an ultrafast gain recovery is measured, promising for high-speed applications of strongly confined InAs dots. Moreover, a dephasing time of 220 fs is measured in the absorption and of 150 fs in the gain case. This latter value is more than three times longer than our previous finding on less-confined quantum dots [P. Borri et al., Appl. Phys. Lett. 76, 1380 (2000)] indicating that the strong confinement can indeed lower the homogeneous broadening under electrical injection. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3262-3264 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have achieved a record high ratio (19) of the Rabi splitting (3.6 meV) to the polariton linewidth (190 μeV), in a semiconductor λ microcavity with a single 25 nm GaAs quantum well at the antinode. The narrow polariton lines are obtained with a special cavity design which reduces the exciton broadening due to scattering with free charges and has a very low spatial gradient of the cavity resonance energy. Since the static quantum-well disorder is very small, the polariton broadening is dominantly homogeneous. Still, the measured linewidths close to zero detuning cannot be correctly predicted using the linewidth averaging model. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1380-1382 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved four-wave mixing in an InAs/InGaAs/GaAs electrically pumped quantum-dot amplifier is measured at room temperature for different applied bias currents going from optical absorption to gain of the device. The four-wave mixing signal from 140 fs pulses shows a transition from a delayed photon-echo response in the absorption regime to a prompt free polarization decay in the gain regime. This corresponds to a pronounced reduction of the dephasing time from 250 fs at zero bias to less than 50 fs at the maximum applied current. The four-wave mixing response at transparency of the device shows a composite structure with both photon echo and free-polarization decay. This is a signature of the digital occupation number in quantum dots, resulting at transparency in a signal from dots occupied with either zero or two excitons corresponding to absorption or gain of the dot ground state. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...