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  • 1
    Online Resource
    Online Resource
    Rijeka, Croatia : InTech
    Keywords: Konferenzschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (422 Seiten) , Illustrationen, Diagramme
    ISBN: 9789535135883
    URL: Volltext  (kostenfrei)
    URL: Volltext  (kostenfrei)
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 21 (1998), S. 243-248 
    ISSN: 1437-2320
    Keywords: Carcinoma ; cranial nerve ; computerized tomography ; nasopharynx ; pathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A review of nasopharyngeal carcinomas (NPCs) treated in the Hacettepe University Hospitals is presented. One hundred twenty-four patients between the ages of 3 years and 72 years were managed in the period 1968–1992. Of these cases, 48 had only cranial nerve (CN) involvement on admission. The most commonly affected CNs were the VIth and the Vth, in that order. The prognostic significance of this finding is obvious, because early diagnosis and treatment is vital in a cancer patient. This study includes retrospective analysis of 124 patients with NPC. The patients were investigated with respect to clinical and radiological diagnosis and outcome. Our results also show that CN involvement in NPC usually requires careful neuro-otological examination. It is suggested that increased knowledge and understanding of the disease among neurosurgeons, neurologists and ENT surgeons would improve the prognosis of patients with NPC.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0935-6304
    Keywords: Supercritical fluid extraction ; capillary GC ; hydrocarbons ; bio-oil ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    World journal of surgery 17 (1993), S. 94-99 
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La nicardipine (N) est une enzyme de conversion rélativement nouvelle capable d'atténuer la prolifération néfaste des greffons veineux autogènes. Dans cette étude expérimentale, randomisée et contrÔlée, on a évalué l'effet de la N sur les pontages aortoaortiques prothétiques pathologiques. Quarante-deux lapins mâles, de l'espèce Orycytolagus cuniculus, ont été randomisés en 3 groupes. Seul le groupe 1 a reÇu de la N, alors que les deux autres groupes ont reÇu du placebo pendant 4 semaines. Un pontage aortoaortique a ensuite été réalisé en utilisant la veine cave autogène. Pendant les quatre semaines suivantes, les groupes 1 et 2 ont reÇu de la N, alors que les lapins du groupe 3 ont continué de recevoir du placebo. Tous les animaux ont été sacrifiés à la fin de l'expérimentation, les greffons ont été prélevés et examinés. L'épaisseur moyenne de l'intima et de la média étaient diminuée dans les groupes 1 et 2 par rapport au groupe 3, attestant du pouvoir de la N à réduire l'hyperplasie des greffons veineux. De mÊme, l'épaisseur moyenne de l'intima et de la média dans le groupe 1 était réduite par rapport aux groupes 2 et 3. Cette différence était statistiquement significative, suggérant que l'utilisation de N avant de réaliser un pontage avait un effet potentialisateur. Les mécanismes événtuellement capables d'expliquer l'effet d'inhibition sur l'hyperplasie sont évoqués, afin de stimuler la recherche à l'avenir.
    Abstract: Resumen La nicardipina (N) es un bloqueador de calcio relativamente nuevo con importantes propiedades que pueden resultar en la atenuación de los cambios adversos de tipo proliferativo que ocurren en los injertos con vena autógena. En el presente estudio experimental, randomizado y controlado, se valoró el efecto de la N sobre los hallazgos patológicos en injertos aorto-aórticos. Los conejos utilizados en el estudio fueron divididos en 3 grupos: el Grupo I recibió N, mientras los grupos 2 y 3 recibieron placebo por 4 semanas, después de lo cual se practicó un injerto aorto-aórtico con segmento de vena cava inferior. En las 4 semanas siguientes, los grupos 1 y 2 recibieron N, mientras se continuaba la administración de placebo al grupo 3. Los animales fueron sacrificados al final del estudio para remover y valorar los injertos. El grosor promedio de la íntima y de la media en los grupos 1 y 2 fue menor que en el grupo 3, lo cual es indicativo de que la N posee un efecto preventivo de significación sobre los cambios hiperplásicos en los injertos de vena, en comparación con el placebo. El grosor promedio de la íntima y de la media también fue menor en el grupo 1 que en el grupo 2, y la diferencia tuvo significación estadística, lo cual sugiere que el uso de N antes de injertar puede potenciar su efecto protector. En el presente artículo se intenta relacionar el efecto preventivo de la hiperplasia de la N con algunos mecanismos probables, con miras a estimular más investigación sobre el tema.
    Notes: Abstract Nicardipine is a relatively new calcium channel blocker with important properties that could result in attenuation of the adverse proliferative changes in autogenous vein bypass grafts. In this experimental, randomized, controlled study, the effect of nicardipine on the pathologic findings in aortoaortic bypass grafts was assessed. Forty-two male rabbits (Orycytolagus cuniculus) were randomized to three groups: group 1 received nicardipine and groups 2 and 3 placebo for 4 weeks, after which an aortoaortic bypass was realized with an autogenous inferior vena cava segment. During the following 4 weeks, groups 1 and 2 received nicardipine, and placebo was continued in group 3. The animals were sacrificed at the end of the study to permit removal and evaluation of the bypass grafts. The mean intimal and medial thickness values for groups 1 and 2 were lower than those for group 3, indicating that nicardipine has a significant preventive effect on the hyperplastic changes in venous bypass grafts compared to placebo. The mean intimal and medial thickness values of group 1 were also lower than those of group 2, and the differences carried statistical relevance, suggesting that the use of nicardipine before grafting could potentiate its protective effect. To provide stimulus for further research, an attempt is made to relate the hyperplasia-preventing effect of nicardipine to possible mechanisms.
    Type of Medium: Electronic Resource
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  • 5
    facet.materialart.
    Unknown
    University of Barcelona, Faculty of Geology
    Publication Date: 2018-06-22
    Description: The Eocene shallow marine deposits marking the first marine incursion in the Biga Peninsula (NW Turkey) after the collision of the Sakarya and Anatolide-Tauride plates were investigated based on paleontological, litho- and chrono-stratigraphic data. Larger Benthic Foraminifera (LBF) from patchily distributed outcrops were studied in order to i) revise the stratigraphy of Eocene shallow marine units, and ii) establish a modern biostratigraphic setting and a correlation scheme. The Şevketiye Formation (Fm.) is herein defined as a predominantly shallow marine clastic deposit with subordinate carbonates overlying the Çamlıca metamorphic rocks, and passing laterally to the Soğucak Fm., a carbonate unit that is widely represented in the Thrace Basin. The record of alveolinids, primitive developmental stages of heterosteginids, and orthophragminids in the Şevketiye Fm. suggests that this formation is part of the Shallow Benthic Zones (SBZ) 16?/17 (Late Lutetian?/Early Bartonian), SBZ17?/18 and SBZ19A (Early Bartonian/earliest Priabonian). The Soğucak Fm., which overlies the Eocene volcanics, on the other hand, yielded advanced developmental stages of heterosteginids, Spiroclypeus sp. and Nummulites fabianii lineages, implying a younger marine incursion during the Late Eocene (earliest Priabonian; SBZ19A). A drastic shift in the depositional regime is marked amid Priabonian by the deposition of deep-marine clastics and volcanoclastics of the Ceylan Fm. In conclusion, the Eocene Sea transgressed first Gökçeada (in the Aegean Sea) during the Late Lutetian, then reached the Biga and Gelibolu peninsulas in the Bartonian, and finally led to the widespread deposition of carbonate and siliciclastic rocks in the Biga Peninsula and the Thrace Basin during the Late Bartonian and Priabonian.
    Print ISSN: 1695-6133
    Electronic ISSN: 1696-5728
    Topics: Geosciences
    Published by University of Barcelona, Faculty of Geology
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new chelating collector, polyacrylamide modified with nitrilo triacetic acid (NTA) was developed for the separation and preconcentration of copper, chromium, manganese, and zinc prior to their determination by Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The retention and recovery of the analyte elements were investigated by applying batch and column techniques. Cu(II), Cr(III), Mn(II) and Zn(II) were quantitatively retained by the collector at pH 5.5 or above. The chelating kinetics are so fast that in the batch procedure a quantitative separation of the analyte elements can be achieved in a few seconds. Since a very short contact time is enough to retain the analyte elements in column technique, a separation step can be completed quickly by applying fast flow rates in small columns. The elements collected were completely recovered with 2 mol/l of HCl. In the presence of sodium chloride up to 0.5% the analyte elements were quantitatively separated and recovered. Low blank values of the collector is another important advantage.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Annals of biomedical engineering 26 (1998), S. 883-891 
    ISSN: 1573-9686
    Keywords: Hearing testing ; Adaptive noise canceling ; Adaptive Wiener filtering ; Otoacoustic emissions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract An innovative acoustic noise canceling method using adaptive Wiener filtering (AWF) was developed for improved acquisition of distortion product otoacoustic emissions (DPOAEs). The system used one microphone placed in the test ear for the primary signal. Noise reference signals were obtained from three different sources: (a) pre-stimulus response from the test ear microphone, (b) post-stimulus response from a microphone placed near the head of the subject and (c) post-stimulus response obtained from a microphone placed in the subject’s nontest ear. In order to improve spectral estimation, block averaging of a different number of single sweep responses was used. DPOAE data were obtained from 11 ears of healthy newborns in a well-baby nursery of a hospital under typical noise conditions. Simultaneously obtained recordings from all three microphones were digitized, stored and processed off-line to evaluate the effects of AWF with respect to DPOAE detection and signal-to-noise ratio (SNR) improvement. Results show that compared to standard DPOAE processing, AWF improved signal detection and improved SNR. © 1998 Biomedical Engineering Society. PAC98: 4364Jb, 4360-c, 8790+y
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 264-268 (May 2004), p. 1225-1228 
    ISSN: 1013-9826
    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
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 138 (1996), S. 1224-1229 
    ISSN: 0942-0940
    Keywords: Pineal gland ; pinealectomy ; transplantation ; collagen ; ageing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Recent progress in pineal research emphasized the importance of this circumventricular organ in the phenomenon of ageing as well. The present study was undertaken to elucidate the effects of pineal gland on collagen ageing by spectrofluorometrically measuring collagen-cross-link bound fluorescein. Experiments were performed on three different age groups of rats (3–4 weeks, 8–10 weeks, 15 and more weeks). Fluorescein values were found to increase causally by age in the control group. Eight weeks after sham operation of all the groups fluorescein level increments were shown to be parallel with the values of normal physiological ageing values. In experimental groups; in 3–5 weeks old rats pinealectomy produced a significant premature collagen ageing and this was found to be completely reversed by foetal pineal gland transplantation, but the reversal was limited to a sham operation level. On the other hand although a premature collagen ageing was found to be induced 8 weeks after pinealectomy in 8–10 weeks old rats with a statistical significance both within subject values and between sham operation and pinealectomy, foetal pineal gland transplantation was found not to reverse the premature ageing induced by pinealectomy. In 15 weeks old and older groups of rats, pinealectomy was found to facilitate the intrinsic ageing phenomenon of collagen with statistical significance again both within subject values and between sham operation and pinealectomy. Foetal pineal gland transplantation was not performed in this age group of rats. On interpretation of the data of pinealectomy against sham operation for all the age groups, the maximum degree of percentage increase in collagen-cross-link bound fluorescein was found in 3–5 weeks old rats (%218). The percentage increase in fluorescein values was found to be %170 and %126 in 8–10 weeks old and 15 weeks old and older rat groups, respectively. Consequently, we have experimentally shown the induction of collagen ageing by pinealectomy and the restorative competence of foetal pineal gland transplantation in the present study. The results seem to be impressive and details of the ageing process are the subject of further research.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 121 (1993), S. 181-186 
    ISSN: 0942-0940
    Keywords: Artery graft ; nerve graft ; nerve regeneration ; nerve tabulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A new experimental model was designed in which the regeneration of rat femoral nerve across a 8 mm excised gap was investigated after insertion of the distal and proximal stumps into the anatomically and functionally intact femoral artery (AIAB). This model was compared with groups of free artery and autologous nerve grafting. After a period of 12 weeks, a histological and electrophysiological analysis was carried out, which demonstrated that the AIAB and autologous nerve grafting group had a significantly higher percentage of regeneration compared with the free artery-graft group. The nerve regeneration and intraneural vascular reconstruction that occured within AIAB group were more successful than those that occured in the artery and nerve-grafting groups.
    Type of Medium: Electronic Resource
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