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  • 1
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (64 Seiten = 3 MB) , Graphen
    Edition: 2021
    Language: German
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 203 (1997), S. 1-8 
    ISSN: 1432-2048
    Keywords: Key words: Carbon-13 ; Cell culture ; Gradient-assisted 2D NMR ; In-vivo ; nuclear magnetic resonance ; Nitrogen-15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1439-099X
    Keywords: Schlüsselwörter: Pankreaskarzinom ; Strahlentherapie ; Chemotherapie ; Resektion ; Überleben ; Biologisch effektive Dosis ; Bestrahlungsvolumen ; Key Words: Pancreatic carcinoma ; Radiotherapy ; Chemotherapy ; Resection ; Survival ; Biologically effective dose ; Treatment volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Purpose: To identify the impact of treatment factors on overall survival in patients with pancreatic carcinoma. Patients andMethods: We performed a follow-up study on 38 patients with adenocarcinoma of the pancreas treated from 1984 to 1998. 18/38 patients were resected. Irradiated volume included the primary tumor (or tumor bed) and regional lymph nodes. Thirty-seven patients received in addition chemotherapy consisting of mitoxantrone, 5-fluorouracil and cis-platin, either i.v. (14/38) or i.a. (23/38). The influence of treatment related factors on the overall survival was tested. Biologically effective dose was calculated by the linear-quadratic model (α/β = 25 Gy) and by losing 0.85 Gy per day starting accelerated repopulation at day 28. Results: Treatment factors influencing overall survival were resection (p = 0.02), overall treatment time (p = 0.03) and biologically effective dose (p 〈 0.002). Total dose and kind of chemotherapy had no significant influence. Treatment volume had a negative correlation (r = −0.5, p = 0.06) with overall survival, without any correlation between tumor size, tumor stage, and treatment volume. In multivariate analysis only biologically effective dose remained significant (p = 0.02). Conclusions: Among with surgery, biologically effective dose strongly influences overall survival in patients treated for pancreatic carcinoma. Treatment volume should be kept as small as possible and all efforts should be made to avoid treatment splits in radiation therapy.
    Notes: Ziel: Behandlungsfaktoren zu identifizieren, die einen Einfluß auf das Überleben von Patienten mit Pankreaskarzinom haben. Patienten und Methode: In einer nichtrandomisierten Studie wurden 38 Patienten ausgewertet, die von 1984 bis 1998 wegen eines Adenokarzinoms des Pankreas behandelt worden waren. Bei 18/38 Patienten war eine Resektion vorgenommen worden. Das Bestrahlungsvolumen beinhaltete den Primärtumor bzw. das Tumorbett und die regionären Lymphknoten. Zusätzlich erhielten 37 Patienten mehrere Chemotherapiezyklen mit Mitoxantron, 5-Fluorouracil und Cis-Platin, entweder intravenös (14/38) oder intraarteriell (23/38). Der Einfluß von Behandlungsfaktoren auf das Überleben wurde untersucht. Die biologisch effektive Dosis wurde mit Hilfe des linearquadratischen Models (α/β = 25 Gy) berechnet bei einem täglichen Wirkungsverlust von 0,85 Gy ab Tag 28. Ergebnisse: Behandlungsfaktoren, die das Überleben beeinflußten, waren die Resektion (p = 0,02), die strahlentherapeutische Behandlungszeit (p = 0,03) und die biologisch effektive Dosis (p 〈 0,002). Gesamtdosis und Applikationsart der Chemotherapie hatten keinen signifikanten Einfluß. Das strahlentherapeutische Behandlungsvolumen wies eine negative Korrelation (r = −0,5 mit p = 0,06) mit dem Gesamtüberleben auf, ohne daß eine Korrelation zwischen Tumorgröße, Tumorstadium und Behandlungsvolumen nachweisbar war. In der multivariaten Analyse behielt allein die biologisch effektive Dosis mit p = 0,02 ihre Signifikanz. Schlußfolgerungen: Neben der Resektion beeinflußt die biologisch effektive Dosis das Überleben der Pankreaskarzinompatienten. Das Bestrahlungsvolumen soll so klein wie möglich gehalten und eine Unterbrechung der Strahlentherapie soll vermieden werden.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2017-08-18
    Description: Two newly designed underway systems for the measurement of CO2 partial pressure (pCO2) in seawater and the atmosphere are described. Results of an intercomparison experiment carried out in the North Sea are presented. A remarkable agreement between the two simultaneously measured (pCO2) data sets was observed even though the spatial variability in surface pCO2 was high. The average difference of all l -min averages of the seawater pCO2 was as low as 0.15 μatm with a standard deviation of 1.2 μatm indicating that no systematic difference is present. A closer examination of the profiles shows that differences tend to be highest during maxima of the pCO2 gradient (up to 14 μatm/min). The time constants of both systems were estimated from laboratory experiments to 45 s, respectively, 75 s thus quantitatively underlining their capability of a fast response to pCO2 changes
    Type: Article , PeerReviewed
    Format: text
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