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  • 1
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 1753-1764 
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: Bound states and zero-energy resonances of one-dimensional finite periodic potentials are investigated, by means of Levinson's theorem. For finite range potentials supporting no bound states, a lower bound for the (reduced) time delay at threshold is derived. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 38 (1997), S. 4882-4883 
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 3423-3432 
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Within discrete kinetic theory, steady detonation wave solutions are here characterized for a reacting hydrogen-oxygen system. Using a suitable kinetic model, the so-called velocity problem is first solved, finding the von Neumann and equilibrium final states, as well as the intermediate states of partial reaction. On the basis of the sonic properties of the flow at the equilibrium final state, the boundary problem is treated in order to characterize the following flow connecting the final state to the rear boundary. Some numerical results of the detonation problem are provided for the two-way autocatalytic reactions OH+M(arrow-right-and-left)H+O+M. The Hugoniot diagram of the model is carried out; the profile of the pressure is drawn and the detonation wave thickness is represented for different detonation wave velocities. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 42 (1984), S. 0 
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: N-Pivaloyl-leucyl–γ-aminobutyric acid (PLG) is a synthetic dipeptide with a partition coefficient of 1.67 in an ethyl acetate/water system that partially inhibits the synaptosomal uptake and activates the release of [U- 14C]-γ-aminobutyric acid ([U-14C]GABA). The displacement of GAB A from crude synaptic membranes by PLG occurs with an IC50 of 10−5M. The compound has the capacity to cross the blood-brain barrier and increase central GABA levels. Its ED50 on cardiazol-induced convulsions is 60-65 mg/kg. PLG is resistant to hydrolysis by chymotrypsin and partially inhibits the proteolytic activity of trypsin.
    Materialart: Digitale Medien
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  • 5
    facet.materialart.
    Unbekannt
    Milano : Periodicals Archive Online (PAO)
    Aevum. 58:2 (1984:magg./ag.) 317 
    ISSN: 0001-9593
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Geschichte
    Notizen: Miscellanea
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  • 6
    ISSN: 1569-8041
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 7
    ISSN: 1433-2965
    Schlagwort(e): Key words:Bone mass – Bone mineral density – Children – Methotrexate – Rheumatoid arthritis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract: Thirty-two children affected by juvenile rheumatoid arthritis (JRA) were studied with serial measurements of bone mass for an average of 18 months, to evaluate the effects of long-term methotrexate (MTX) treatment on bone. Bone mineral density (BMD) was measured on lumbar spine and total body. During MTX therapy some increase in BMD was observed, though this was smaller than in a control group of healthy children. Axial (spine and trunk) and appendicular (upper and lower limbs) BMD showed similar increases. BMD, either as an absolute value or as a percent variation from baseline, did not correlate with either MTX dose or length of therapy. In children treated also with corticosteroids, these drugs negatively influenced bone mass increase. The main determinant of absolute spine BMD value appeared to be weight, while height and lean mass seemed to be the determinants of total body BMD. Pubertal stage and disease activity significantly influenced the yearly change in BMD. In conclusion, our data suggest that long-term, low-dose therapy with MTX does not induce osteopenia in children with JRA.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Mycopathologia 140 (1997), S. 13-17 
    ISSN: 1573-0832
    Schlagwort(e): Cryptococcosis ; cryptococcosis associated with AIDS
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Some epidemiologic, diagnostic and immunologic aspects of 93 (75 males and 18 women) cases of cryptococcosis (CRY) associated with AIDS, hospitalized in the Muñiz Hospital (MH) in Buenos Aires during 1994, were retrospectively studied. The median age (MA) of the patients under study was 28 years (17–49 y); 30 (17–49) y for males and 23 (22–34) y for women. Intravenous drug addiction (34% of patients) and homo/bisexuality in men (17%) were the most frequent risk factors for HIV infection. The MA of these groups were 27.5 (17–41) y and 34 (25–41) y, respectively. Microscopic CSF examination with India ink and the blood cultures (lysis-centrifugation) achieved the diagnosis of CRY in 67 (72%) and 16 (17%) patients, respectively. At diagnosis, the median titers for Cryptococcus neoformans capsular antigen were 1/1,000, 1/100 and 1/1 in serum, CSF and urine, respectively. Sixty five strains of C. neoformans were insolated from clinical samples; all were identified at variety neoformans employing the culture medium proposed by Salkin & Hurd and the D-proline assimilation test. At diagnosis, CD4+lymphocytes counts were 〈50/μl in 46 patients (83.63%), and were between 51 and 200/μl in 9 (16.4%). The CD4+CD8+ ratio was 〈1 in all patients. Most patients were born (83%) and lived at diagnosis (96%) in Buenos Aires (Bs As) city, Bs As outskirts towns and cities located in Bs As province.
    Materialart: Digitale Medien
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  • 9
    ISSN: 1420-908X
    Schlagwort(e): Chlomipramine ; Fluoxetine ; Edema ; Prostaglandins ; Substance P
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We have previously shown that, after acute administration, antidepressant drugs exert anti-inflammatory actions in rats. In this study we evaluated the effects of 3 different doses of chlomipramine (10, 20, and 40 mg/kg i.p), and fluoxetine (5.0, 10, and 20 mg/kg i.p.) on subcutaneous carrageenin-induced inflammation. Both drugs dose-dependently reduced the inflammatory exudate, as well as the PGE2-like bio- and immuno-activity in the exudate. Chlomipramine dose-dependently reduced substance P concentrations in the exudate, whereas fluoxetine was effective only at the highest dose. Our results confirm that antidepressant drugs are able to reduce the development of inflammation in the rat and suggest that the inhibition of substance P production might play a role in mediating the anti-inflammatory effects of chlomipramine.
    Materialart: Digitale Medien
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  • 10
    ISSN: 1432-1920
    Schlagwort(e): Key words Arteries ; vertebral ; Arteries ; dissection ; Magnetic resonance imaging ; Magnetic resonance angiography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A review of 4,500 angiograms yielded 11 patients with dissection of the vertebral arteries who had MRI and (in 4 patients) MR angiography (MRA) in the acute phase of stroke. One patient with incidental discovery at arteriography of asymptomatic vertebral artery dissection and two patients with acute strokes with MRI and MRA findings consistent with vertebral artery dissection were included. Dissection occurred after neck trauma or chiropractic manipulation in 4 patients and was spontaneous in 10. Dissection involved the extracranial vertebral artery in 9 patients, the extra-intracranial junction in 1, and the intracranial artery in 4. MRI demonstrated infarcts in the brain stem, cerebellum, thalamus or temporo-occipital regions in 7 patients with extra- or extra-intracranial dissections and a solitary lateral medullary infarct in 4 patients (3 with intracranial and 1 with extra-intracranial dissection). In 2 patients no brain abnormality related to vertebral artery dissection was found and in one MRI did not show subarachnoid haemorrhage revealed by CT. Intramural dissecting haematoma appeared as crescentic or rounded high signal on T1-weighted images in 10 patients examined 3–20 days after the onset of symptoms. The abnormal vessel stood out in the low signal cerebrospinal fluid in intracranial dissections, whereas it was more difficult to detect in extracranial dissections because of the intermediate-to-high signal of the normal perivascular structures and slow flow proximal and distal to the dissection. In two patients examined within 36 h of the onset, mural thickening was of intermediate signal intensity on T1-weighted images and high signal on spin-density and T2-weighted images. MRA showed abrupt stenosis in 2 patients and disappearance of flow signal at and distal to the dissection in 5. Follow-up arteriography, MRI or MRA showed findings consistent with occlusion of the dissected vessel in 6 of 8 patients.
    Materialart: Digitale Medien
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