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  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 5603-5608 
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A two-dimensional shear viscometer has been constructed and tested using free-standing liquid soap films. The viscometer, which is an analog of a three-dimensional Couette cell, consists of an inner rotating disk and an outer stationary ring. The viscosity of the liquid films can be reliably obtained by measuring either the transient response of the disk upon a stepwise increment of the applied stress on the disk, or by measuring the strain-stress relation in the steady state. The design can be easily modified to accommodate other types of flow which are useful for investigating hydrodynamic and rheological behavior in a variety of thin films, such as liquid crystal and polymer films. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 10 (1997), S. 0 
    ISSN: 1540-8183
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3832-3832 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 774-776 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An experimental investigation was made on the use of a PtSi Schottky barrier for blocking injected electron dark current in a back-illuminated impurity-band-conduction (IBC) photodetector, a device used for detecting long-wavelength infrared (LWIR) radiation. Measured results on the Schottky barrier height as well as current versus applied bias results are presented, and show that the desired blocking capability has been attained. At the low operating temperatures (∼10 K) of the IBC device, the injected dark current is below our measurement capability for applied biases of up to 10 V. Injected dark current in conventional devices occurs at biases of ∼1 V. The modified device configuration discussed here would enable one to store the mobile ionized donor charge for subsequent readout. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1250-1252 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An experimental investigation was made of GaAs and GaAs/AlAs barriers on Si for blocking injected dark current in impurity-band-conduction (IBC) infrared photodetectors. Reducing dark current would improve detector performance. Experimental results indicate that barrier heights of the order of 0.29 eV were obtained. Current versus bias behavior at temperatures ≤20 K showed successful blocking of injected electron dark current for negative applied biases in the operating range for IBC detectors. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1520-6041
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Anaesthesia 53 (1998), S. 0 
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Increasing numbers of patients with spinal cord injury present for surgery or obstetric care. Spinal cord injury causes unique pathophysiological changes. The most important peri-operative dangers are autonomic dysreflexia, bradycardia, hypotension, respiratory inadequacy and muscle spasms. Autonomic dysreflexia is suggested by headache, sweating, bradycardia and severe hypertension and may be precipitated by surgery, especially bladder distension. Patients with low, complete lesions, undergoing surgery below the level of injury, may safely do so without anaesthesia provided there is no history of autonomic dysreflexia or troublesome spasms. An anaesthetist should be present to monitor the patient in this situation. General anaesthesia of sufficient depth is effective at controlling spasms and autonomic dysreflexia but hypotension and respiratory dysfunction are risks. There is a growing consensus that spinal anaesthesia is safe, effective and technically simple to perform in this group of patients. We present a survey of 515 consecutive anaesthetics in cord-injured patients and a review of the current literature on anaesthesia for patients with chronic spinal cord lesions.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 9590-9591 
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
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  • 9
    ISSN: 1432-1432
    Schlagwort(e): Dictyostelium discoideum ; Complex I ; NAD-reducing hydrogenase ; Mitochondrial evolution ; Endosymbiotic
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Complex I, a key component of the mitochondrial electron transport system, is thought to have evolved from at least two separate enzyme systems prior to the evolution of mitochondria from a bacterial endosymbiont, but the genes for one of the enzyme systems are thought to have subsequently been transferred to the nuclear DNA. We demonstrated that the cellular slime mold Dictyostelium discoideum retains the ancestral characteristic of having mitochondria encoding at least one gene (80-kDa subunit) that is nuclear encoded in other eukaryotes. This is consistent with the cellular slime molds of the family Dictyosteliaceae having diverged from other eukaryotes at an early stage prior to the loss of the mitochondrial gene in the lineage giving rise to plants and animals. The D. discoideum mitochondrially encoded 80-kDa subunit of complex I exhibits a twofold-higher mutation rate compared with the homologous chromosomal gene in other eukaryotes, making it the most divergent eukaryotic form of this protein.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Der Ophthalmologe 96 (1999), S. 570-577 
    ISSN: 1433-0423
    Schlagwort(e): Key words Gene therapy • Viral vectors • Retinal degeneration • Adenovirus • Adeno-associated virus ; Schlüsselwörter Gentherapie • Virale Vektoren • Netzhautdegenerationen • Adenovirus • Adeno-assoziiertes Virus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Fragestellung: Die ständig wachsenden Erkenntnisse über die molekularen Ursachen vieler Augenkrankheiten eröffnen auch neue Therapiemöglichkeiten. Wie kann die fortschreitende Genotyp-Phänotyp-Korrelation für die Entwicklung einer Gentherapie genutzt werden? Material und Methoden: Der Gentransfer kann bei rezessiven Erkrankungen für den Genersatz, bei dominanten Erkrankungen für die gezielte Inaktivierung, bei degenerativen Erkrankungen für die Expression von sogenannten „rescue factors“ oder zur Apoptosismodulation, bei proliferativen Erkrankungen für die Expression von „suicide genes“ und bei immunologischen Erkrankungen zur Immunmodulation genutzt werden. Allen Strategien ist die Übertragung von Fremd-DNA in ein Zielgewebe des Auges durch ein Vektorsystem gemeinsam. Ergebnisse: Vor allem virale Vektorsysteme sind bereits für den Gentransfer am Auge untersucht worden: Adenovirus (AV), Adeno-assoziiertes Virus (AAV), Encapsidated adenovirus minichromosomes (EAMs), Herpes-simplex-Virus (HSV) und Lentiviren. Für den Gentransfer in die Netzhaut hat AAV zur Zeit das größte Potential. Die Transduktionseffizienz der Vektorsysteme, ihre Vor- und Nachteile, die verwendeten Tiermodelle und der Stand der Forschung werden diskutiert. Schlußfolgerung: Der Gentransfer ist auch in der Augenheilkunde ein vielversprechender aber immer noch experimenteller Therapieansatz.
    Notizen: Background: Research into the molecular and genetic basis of disease is continually expanding. How does the increasing knowledge about the genetic basis of eye diseases contribute to the development of new therapeutic strategies? Materials and methods: Gene therapy, here defined as the introduction of genetic material into human cells, offers great opportunities. Gene transfer strategies can be used for gene replacement in recessive disease, gene inactivation in dominant disease, expression of “rescue factors” and apoptosis modulators in degenerative disease, “suicide genes” for example in proliferative diseases and expression of immunmodulatory factors in immunological disorders. Viral vector systems have been developed to introduce the gene of interest into the target cell. Results: Most of the published strategies include the use of vectors for gene transfer. Adenovirus (AV), adenoassociated virus (AAV), encapsulated adenovirus mini-chromosomes (EAMs), herpes simplex virus (HSV) and lentiviruses are the most frequently used viral vector systems to date. Their advantages and disadvantages, the in vivo models used for gene transfer in retinal degeneration, and the results obtained to date by different research groups in the field will be reviewed. Conclusions: Gene transfer into ocular tissues has been demonstrated with growing functional success and may develop into a new therapeutic tool for clinical ophthalmology.
    Materialart: Digitale Medien
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