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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 256 (1975), S. 642-644 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] If SCE rejoining occurs randomly between chromatid sub-units, the ratio of twin to single SCE should theoretically be 1:10 (ref. 2). Alternatively, if SCE rejoining is restricted due to inherent polarity, this ratio should theoretically be 1:2 (ref. 2). Experimental support for these alternatives ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 291 (1979), S. 77-86 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Sources of149Nd were produced by thermal-neutron irradiation of enriched148Nd. High resolution Ge(Li) spectrometers were used to collect gamma-ray singles and coincidence spectra in the study of the decay of 1.7-h149Nd. A total of 214 gamma rays have been assigned to the decay of149Nd, and 201 of these transitions have been placed in a level scheme of149Pm involving 42 excited states. Absolute values for the beta-group intensities were determined for transitions to the149Pm levels, and spin and parity assignments were made for many of the observed states. The experimentally determined level structure of149Pm was compared with corresponding levels in other odd-mass Pm and Eu nuclides. Interpretations were made in terms of the core-coupling model. Radioactive decay148Nd(n, γ)149Nd; measuredE γ,I γ,γ-γ coinc.149Pm deduced levels,J,π. Compton-suppression. Ge(Li) detector. Enriched targets.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 283 (1977), S. 415-416 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The half life of the 376.7-keV level in111 Ag, populated in the decay of111 Pd isomers, has been determined to be 16±1 ns. Compton-suppressed γ-ray spectra and γγ coincidence spectra have also been taken. These data, combined with recent charged-particle transfer data establish 3/2+ as the spin and parity of the 376.7-keV111Ag level. Our observed lifetime and γ-ray branching can be interpreted as strong indications of shape isomerism in111Ag similar to that found in odd-mass In nuclides.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The23Na NMR first order quadrupolar satellite lines are detected and studied in AgNa(NO2)2 single crystals near the paraelectric-ferroelectric phase transition. Although the intensities of the satellites are small the components of the electric field gradient tensor (EFG) at the23Na sites could be deduced from the angular dependence of the first order quadrupolar line splitting with respect to rotations around the three crystallographic axes by applying the Volkoff method. In the paraelectric phase the principal axes system of the EFG coincides with the crystallographic axes system whereas in the ferroelectric phase there is a strongly temperature dependent small non diagonal elementφ xz (T). The EFG principal componentsφ xx andφ yy are strongly influenced whereas the EFG principal componentφ zz is nearly not affected by the ferroelectric phase transition. The observed temperature dependences of the EFG components are related to the temperature variation of the normalized spontaneous polarizationS(T) by assuming a coupling term which is quadratic inS(T). Finally the problem of the intensities of the satellite lines is discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 13 (1975), S. 235-258 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A computer model based on Monte Carlo techniques was developed to simulate the destruction of lunar rocks by ‘catastrophic rupture’ due to meteoroid impact. Energies necessary to accomplish catastrophic rupture were derived from laboratory experiments. A crater-production rate derived from lunar rocks was utilized to calculate absolute time scales. Calculated median survival times for crystalline lunar rocks are 1.9, 4.6, 10.3, and 22 m.y. for rock masses of 10, 102, 103, and 104 g respectively. Corresponding times of 6, 14.5, 32, and 68 × 106 yr are required, before the probability of destruction reaches 0.99. These results are consistent with absolute exposure ages measured on returned rocks. Some results also substantiate previous conclusions reached by others: the catastrophic rupture process is significantly more effective in obliterating lunar rocks compared to mass wasting by single particle abrasion. The view is also corroborated that most rocks presently on the lunar surface are either exhumed from the regolith or fragments of much larger boulders, rather than primary ejecta excavated from pristine bedrock.
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  • 7
    ISSN: 1432-1459
    Keywords: Parkinson's disease ; Cerebral atrophy ; Arteriosclerosis ; Computed tomography ; CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Computertomographische Untersuchungen von Parkinsonkranken haben in einem hohen Prozentsatz Zeichen einer Hirnatrophie ergeben, in den meisten Fällen eine Kombination von kortikaler Atrophie und Ventrikelerweiterung. In der vorliegenden Untersuchung wurde den Beziehungen zwischen Hirnatrophie und körperlichen Befunden, die eine Arteriosklerose anzeigen oder deren Entstehung begünstigen, wie Übergewicht, EKG-Veränderungen, Hypertonie, Verkalkungen der A. carotis interna und der Aorta sowie einer Aortenlongation nachgeganen. Die Untersuchung basiert auf 173 behandelten und unbehandelten Parkinsonkranken (89 Männer, 84 Frauen) im Alter von 37–84 Jahren (mittleres Alter 64,6 J.), bei denen eine Computertomographie nach durchschnittlich 5,4 Jahren Krankheitsdauer durchgeführt wurde. Die Ergebnisse zeigen einen Anstieg sowohl von pathologischen CT-Befunden als auch von Verkalkungen im Carotissiphon mit zunehmendem Alter. Zwischen den übrigen Merkmalen und dem Alter bestehen keine Zusammenhänge. Die weitere Analyse ergab eine statistisch relevante Beziehung lediglich zwischen Hirnatrophie und Karotissiphonverkalkungen, insbesondere solchen der Media. Da sowohl die hirnatrophischen Veränderungen als auch die Verkalkungen des Karotissiphons mit höherem Lebensalter korreliert sind, während alle übrigen Merkmale, die als Zeichen einer Arteriosklerose angesehen werden können, keine eindeutigen Beziehungen zum Ausmß hirnatrophischer Veränderungen zeigen, ist zu folgern, daß die Hirnatrophie im Rahmen der Parkinsonschen Krankheit nicht durch arteriosklerotische Veränderungen verursacht wird.
    Notes: Summary Computed tomographic examinations of parkinsonian patients revealed a high incidence of cerebral atrophy, in most cases a combination of cortical atrophy and ventricular enlargement. The present study considered the relationship between cerebral atrophy and physical signs indicating or promoting arteriosclerosis such as overweight, electrocardiographic changes, hypertension, calcification of the internal carotid artery and aorta as well as elongation of the aorta. The study is based on 173 treated and untreated parkinsonian patients (89 men, 84 women) aged from 37–84 years (mean 64.6), on whom CT was performed about 5.4 years after the onset of the first symptoms of the illness. The results demonstrate an increase of pathological CT findings as well as of calcification in the carotid siphon with advanced age. No correlation was found between the other items and increasing age. Further analysis of the relationship between cerebral atrophy and signs of arteriosclerosis revealed only a statistically relevant correlation with calcification of the carotid siphon, especially with calcification of the media. Since pathological CT findings and calcification of the internal carotid artery are both related to advanced age, whereas all the other items which may be considered to be indications of arteriosclerosis do not have any clear relationship, it is concluded that the cerebral atrophy in Parkinson's disease is not caused by arteriosclerosis.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 222 (1979), S. 37-43 
    ISSN: 1432-1459
    Keywords: Parkinson's disease ; Cerebral atrophy ; Computed tomography ; Long-Term response to levodopa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An 92 Parkinsonkranken (42 Männer, 50 Frauen) im Alter von 37–79 Jahren (mittleres Alter 62,8 J.) wurde der Einfluß computertomographisch erfaßter hirnatrophischer Veränderungen auf den Verlauf der klinisch-neurologischen Symptomatik unter L-Dopa während einer Beobachtungszeit von 1–5 Jahren untersucht. Die Ergebnisse zeigen, daß Kranke mit einer Hirnatrophie mittleren bis schweren Grades — unabhängig von der jeweiligen Lokalisation — einen geringeren Besserungsgrad aufweisen als solche mit einem normalen CT-Befund. Die Daten erlauben keine eindeutige Entscheidung darüber, ob die kortikale Atrophie oder die Ventrikelerweiterung von größerer Wichtigkeit sind. Keinen Einfluß auf den Verlauf scheint die Weite des 3. Ventrikels zu haben. Nach dem 3. Behandlungsjahr kommt es zu einer Dissoziation der Beziehungen zwischen Hirnatrophie und Behandlungseffekt.
    Notes: Summary In 92 parkinsonian patients (42 men, 50 women) aged from 37–79 years (mean 62.8) the impact of cerebral atrophy as assessed by computed tomography on the course of the clinical symptomatology under levodopa during a period of 1 to 5 years was investigated. It could be shown that patients suffering from medium to severe degrees of atrophy—independent of its special location—have a less favorable response than those with normal CT findings. The data do not allow a definite decision whether cortical artrophy or ventricular enlargement are of major importance. At any rate, the width of the third ventricle seems to have no influence on the course of the clinical symptoms. After 3 years of levodopa treatment a dissociation between cerebral atrophy and therapeutic effectiveness can be observed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 223 (1977), S. 131-138 
    ISSN: 1433-8491
    Keywords: Sleep EEG ; Circulation Disturbances ; Correlation to Psycho-organic Impairment ; Schlaf-EEG ; cerebrale Durchblutungsstörungen ; Bezieziehungen zu psychoorganischen Veränderungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 30 bewußtseinsklaren Patienten (24 Männer, 6 Frauen) im Alter von 30–74 Jahren mit ischämischen Großhirnhemisphärenläsionen wurden durchschnittlich 45 Tage nach Krankheitsbeginn polygraphische Nachtschlafregistrierungen durchgeführt. Die Schlaf-EEG-Veränderungen waren gekennzeichnet durch eine Verlängerung der Einschlaf- und Wachzeiten sowie eine Abnahme des tiefen synchronen Schlafes. Korrelationsstatistische Untersuchungen zeigen, daß ältere Patienten längere Wachzeiten haben, ebenso wie Kranke mit hohen komplexen Reaktionszeiten und einer euphorischen Stimmungslage, die als Ausdruck einer hirnorganischen Leistungsbeeinträchtigung interpretiert werden können. Demgegenüber tritt die Schwere des klinisch-neurologischen Syndroms für Art und Schwere der Schlafstörung zurück.
    Notes: Summary In 30 conscious patients (24 men, 6 women) aged 30–74 years suffering from ischemic lesions in the cerebral hemispheres, polygraphic night sleep recordings were performed about 45 days after the beginning of the illness. The alterations in sleep were characterized by a delay in the onset of sleep, prolonged waking periods, and a reduction of deep synchronous sleep. Statistical analysis revealed a relationship between prolonged waking time with higher age as well as with high complex reaction time and euphoric state of mind, which can be considered as a sign of psycho-organic impairment. In contrast thereto, the degree of the neurological symptomatology is of less importance for the kind and extent of the sleep disturbances.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 227 (1979), S. 81-88 
    ISSN: 1433-8491
    Keywords: Brain atrophy ; Parkinson's disease ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To clarify the importance of brain atrophy in relation to the symptoms of Parkinson's disease, 173 patients were examined by computed tomography (CT). In 51.4% of the CT findings, brain atrophy was considered to be pathological. Statistically significant relations of age and sex were found with regard to the extent and localization of brain atrophy. Cortical atrophy also showed a significant dependence on duration of disease. Linear measurements at the lateral ventricles and the third ventricle lead us to assume that brain atrophy in Parkinson's patients is more prevalent than in normal patients within the scope of age involution.
    Type of Medium: Electronic Resource
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