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  • 1
    Digitale Medien
    Digitale Medien
    Substrate-polarity dependence of metal-organic vapor-phase epitaxy-grown GaN on SiC (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4531-4535 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single-crystal gallium nitride was grown on each of the two polar {0001} planes of 6H-silicon carbide substrates utilizing metal-organic vapor-phase epitaxy. The substrate polarity is clearly shown to strongly influence the surface morphology and the photoluminescence property of the layer. The examination of the layer surfaces using x-ray photoelectron spectroscopy revealed that {0001} GaN grown on the basal planes of SiC changes its polarity in accordance with the substrate polarity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341281
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  • 2
    Digitale Medien
    Digitale Medien
    Scalings of implosion experiments for high neutron yield (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2884-2893 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A series of experiments focused on high neutron yield has been performed with the Gekko-XII green laser system [Nucl. Fusion 27, 19 (1987)]. Deuterium–tritium (DT) neutron yield of 1013 and pellet gain of 0.2% have been achieved. Based on the experimental data from more than 70 irradiations, the scaling laws of the neutron yield and the related physical quantities have been studied. Comparison of the experimental neutron yield with that obtained by using a one-dimensional fluid code has led to the conclusion that most of the neutrons produced in the stagnation phase of the computation are not observed in the experiment because of fuel–pusher mixing, possibly induced by the Rayleigh–Taylor instability. The coupling efficiency and ablation pressure have been calculated using the ion temperature measured experimentally. A coupling efficiency of 5.5% and an ablation pressure of 50 Mbar have been obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.866997
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  • 3
    Digitale Medien
    Digitale Medien
    High-power operation in InGaAs separate confinement heterostructure quantum well laser diodes (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1-3 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Lasing characteristics have been investigated systematically in long-wavelength InGaAs separate confinement heterostructure quantum well laser diodes (SCH QW LD's) with varied well thicknesses and number of wells, for the first time. Marked improvements in threshold current density and characteristic temperature values have been observed in SCH MQW LD's to SCH SQW LD's. Maximum cw output power of 46 mW at 20 °C has been achieved in SCH QW LD's with five wells, which is the highest among the long-wavelength quantum well LD's.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100120
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  • 4
    Digitale Medien
    Digitale Medien
    Improvement of the bulk laser damage threshold of potassium dihydrogen phosphate crystals by reducing the organic impurities in growth solution (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 420-421 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We obtained damage-resistant crystals of potassium dihydrogen phosphate (KDP) by reducing organic impurities in the growth solution. To prevent organic impurity exuded from the wall of the growth vessel, Pyrex glass was used. The residual organic impurities, which mainly derived from KDP raw powder, were reduced by photochemical dissociation using a combination of ultraviolet light and an oxidant (hydrogen peroxide). The resultant total organic carbon of the solution was less than 0.1 ppm. The damage threshold of the crystals grown from this solution was always high (20–22 J/cm2), which is about three times higher than that of crystals grown by conventional methods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99429
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  • 5
    Digitale Medien
    Digitale Medien
    The alteration in the pattern of pulmonary metastasis with adjuvant chemotherapy in osteosarcoma (1988)
    Springer
    International orthopaedics 12 (1988), S. 305-308 
    Details
    ISSN: 1432-5195
    Schlagwort(e): Osteosarcoma ; Pulmonary metastasis ; Adjuvant chemotherapy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé On a étudié les modifications de l'aspect des métastases pulmonaires chez des malades porteurs d'un ostéosarcome et traités par chimiothérapie complémentaire. Trente-deux malades traités à la fois par chirurgie radicale et chimiothérapie ont été examinés (groupe avec chimiothérapie). Soixante-deux malades traités seulement par chirurgie radicale (groupe sans chimiothérapie) ont également été suivis, constituant un groupe de contrôle. Le groupe avec chimiothérapie a présenté une diminution du nombre ainsi qu'un retard à l'apparition des métastases. Le temps de doublement de ces tumeurs ne diffère pas entre les deux groupes. La localisation initiale des métastases dans le groupe avec chimiothérapie est le plus souvent la base du poumon, tandis que dans le groupe sans chimiothérapie c'est habituellement la partie moyenne du poumon. Après apparition des métastases pulmonaires la durée de survie est plus importante dans le groupe avec chimiothérapie que dans l'autre. L'examen histologique montre que les foyers métastatiques sont identiques à la localisation initiale de la tumeur.
    Notizen: Summary Alterations in the pattern of pulmonary metastasis of patients with osteosarcoma treated with adjuvant chemotherapy were studied. Thirty two patients who were treated with both radical surgery and adjuvant chemotherapy were observed (chemotherapy group). As a control, sixty two patients treated with radical surgery alone were also assessed (non-chemotherapy group). The chemotherapy group demonstrated a reduction in the number and a delay in the appearance of metastases. The tumour doubling time did not differ between the chemotherapy and non-chemotherapy groups. The initial site of metastasis among the chemotherapy group was most commonly in the lower lung field, whereas among the non-chemotherapy group it was usually to the middle lung field. The chemotherapy group survived longer than the non-chemotherapy group after developing pulmonary metastases. Histological examination showed that the metastatic foci simulated the primary sites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00317829
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  • 6
    Digitale Medien
    Digitale Medien
    Immunohistochemical demonstration of transient increase in prostaglandin F2-alpha after recirculation in global ischemic rat brains (1988)
    Springer
    Acta neuropathologica 76 (1988), S. 496-501 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Prostaglandin F2-alpha ; Immunohistochemistry ; Transient increase ; Hippocampus ; Purkinje cell
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The changes in prostaglandin F2-alpha (PG F2α) staining over 3 days of recirculation in both fore-and hindbrains were studied. Five minutes of global ischemia was produced in 24 rats by Pulsinelli's method with hypotension around 50 mm Hg of mean arterial blood pressure. Eight rats (including three pretreated with indomethacin) were recirculated for 5 min, three for 1 h, five for 2 h and five for 3 days. Five normal rats without occlusion of vessels served as controls. The brains were snap frozen. Ten-micrometer cryosections were stained for PG F2α by the indirect immunofluorescence method after fixation in carbodiimide and in Zamboni's solution. Positive staining for PG F2α was noted in pial vessels in all normal and ischemic rats. Recirculated rats revealed the strongest reaction at 5 min after recirculation in blood vessels and in neuronal cytoplasm (especially in hippocampi and in Purkinje cells). The intensity of staining was markedly reduced after 1 h. Rats pretreated with indomethacin showed less increase in staining. The above results indicate that recirculation after ischemia produces a transient increase in PG F2α in blood vessels and neurons of both fore- and hindbrains.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00686389
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  • 7
    Digitale Medien
    Digitale Medien
    Symbioramide, a novel Ca2+-ATPase activator from the cultured dinoflagellateSymbiodinium sp. (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 800-802 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Dinoflagellate ; symbioramide ; Symbiodinium sp. ; ceramide ; Ca2+-ATPase activator
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary A novel sphingosine derivative, symbioramide, has been isolated from the laboratory-cultured dinoflagellateSymbiodinium sp. as a sarcoplasmic reticulum (SR) Ca2+-ATPase activator, and its structure elucidated to be1 on the basis of spectral and chemical means.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01959173
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  • 8
    Digitale Medien
    Digitale Medien
    A signoidal relationship between liver stearoyl CoA desaturase activity and serum hormone concentrations caused by streptozocin and its antagonists (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 756-758 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Stearoyl CoA desaturase ; streptozocin ; streptozocin antagonist ; insulin effect on desaturase ; thyroid hormone effect on desaturase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Stearoyl CoA desaturase activity in liver microsomes, and insulin, thyroxine, and triiodothyronine levels in serum were measured after administration of streptozocin (STZ) and its antagonists to rats. The effect of STZ, which caused hyperglycemia and inhibited the desaturase activity, was antagonized by 2-desoxyglucose and 3-O-methyl-glucose; 1-O-methyl-3-desoxyglucose and 1-O-methyl-3-O-methylglucose were without any effect. The enzyme activity plotted against insulin levels showed a broad sigmoidal curve, whereas the activities versus thyroid hormone levels showed steeper sigmoidal curves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01959152
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of intracisternal thromboxane A2 analogue on cerebral artery permeability (1988)
    Springer
    Acta neurochirurgica 90 (1988), S. 144-151 
    Details
    ISSN: 0942-0940
    Schlagwort(e): Thromboxane A2 ; Blood-arterial wall permeability ; Major cerebral arteries
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Thromboxane, a highly vasoactive substance, is found in the cerebrospinal fluid of patients and experimental animals following subarachnoid haemorrhage. A stable synthetic analogue of thromboxane A2 was administered intracisternally in rabbits. This resulted in an increase in endothelial permeability of the major cerebral arteries to Evans Blue dye and horseradish peroxidase. Thromboxane may be involved in the pathogenesis of cerebral vasospasm and may be related to the contrast enhancement of the arteries in the basal cisterns on CT scans of patients who are prone to develop arterial narrowing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01560570
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