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  • 11
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le dosage de la sérotonine dans le sang prélevé en des points précis du système veineux abdominal grâce au cathétérisme sélectif a été étudié par les auteurs au plan du diagnostic et de la localisation de la tumeur carcinoide. Le taux de la sérotonine a été déterminé par une technique enzymatique portant sur une fraction plasmatique plaquettaire particulière (P.P.P.P.). Chez 5 sujets normaux, la concentration de la sérotonine dans des échantillons sanguins prélevés au niveau de l'artère coeliaque, de la veine hépatique ?, des veines pancréatiques et de différentes veines de l'appareil digestif s'est située entre 1,2,5, 4 ng/ml. Chez 10 malades qui présentaient des tumeurs carcinoïdes cette concentration dans le sang des veines drainant les tumeurs étaient nettement élevées et variait entre 10 ng/ml et 80 ng/ml. Chez ces mêmes malades 5 dosages de 5 H.I.A.A. urinaire faussement négatif ont été constatés ainsi que 2 scintigraphies hépatiques faussement négatives et 2 angiographies d'interprétation incertaine. La méthode étudiée se présente donc comme un complément utile des autres méthodes d'explorations permettant de porter le diagnostic de tumeur carcinoïde, de déterminer son siège et de suivre l'évolution des malades porteur de cette lésion.
    Abstract: Abstracto Se realizó la evaluación del cateterismo selectivo de venas abdominales en relación a su uso en el diagnóstico, localización y caracterización de carcinoides. La serotonina fue determinada en una fracción de plasma pobre en plaquetas (PPP) por un procedimiento enzimático. La concentración de serotonina en PPP en la arteria celiaca, la vena hepática y en diferentes venas intestinales y pancreáticas osciló entre 1.2–5.4 ng/ml. En 10 pacientes con tumores carcinoides la concentración de serotonina en las venas que drenaban el tumor se encontró notoriamente elevada y varió desde 10 mg/ml hasta 88 mg/ml PPP. Los niveles de 5-HIAA en orina fueron negativos falsos en 4 casos, el centelleoescanograma del hígado fue negativo falso en 3 casos y el angiograma fue no conclusivo en 2 casos. La técnica de la determinación de serotinina en el plasma en combinación con el cateterismo selectivo es un complemento útil de otras técnicas investigativas en el diagnóstico, localización y seguimiento de pacientes con tumores carcinoides.
    Notes: Abstract Selective abdominal vein catheterization with blood sampling for serotonin determination was evaluated regarding its use in the diagnosis, location, and characterization of carcinoids. Serotonin was determined in a platelet-poor plasma fraction (PPP) by an enzymatic procedure. In 5 normal subjects the concentration of serotonin in PPP in the celiac artery, the hepatic vein, and different intestinal and pancreatic veins ranged from 1.2 to 5.4 ng/ ml. In 10 patients with carcinoid tumors, the concentration of serotonin in tumor-draining veins was clearly elevated and ranged from 10 ng/ml to 88 ng/ml PPP. 5-HIAA urine levels were false-negative in 4 cases, liver scintiscan was false-negative in 3 cases, and the angiograms were not conclusive in 2 cases. The technique with plasma serotonin determination in combination with selective catheterization is a useful complement to other investigative techniques in the diagnosis, location, and follow-up of patients with carcinoid tumors.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 38 (1971), S. 377-394 
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung In einigen eutrophen Seen sowie in axenischen Blaualgen-Kulturen wurden die Katalysebedingungen für die hydrolytische Spaltung von Phosphorverbindungen untersucht. Der hitzestabile Anteil filtrierter Wasserproben besa\gB zwar niedrige, jedoch deutlich pH-abhängige Aktivitäten von Phosphomonoesterasen (PME;EC.3.1.3), wenn p-Nitrophenylphosphat als unspezifisches Substrat diente. In 3 verschiedenen See-Biotopen korrespondierten circadiane Schwankungen der PME mit den Konzentrationen der gelösten Phosphorverbindungen und den Bakterienkeimzahlen. In Vertikalprofllen des Plu\gB-Sees unterlagen die PME-Aktivitäten beträchtlichen jahreszeitlichen Schwankungen. Hier schienen eher die kinetischen Parameter (Michaelis-Konstanten )als die reinen Aktivitäten mit den Phosphatgehalten im Biotop korreliert. Diese Ergebnisse stimmten grö\gBtenteils mit einigen physiologischen Regulationsmechanismen der PME überein, die in Blaualgen-Kulturen unter dem Einflu\gB definierter Au\gBenmilieufaktoren beobachtet wurden konnten. Ein axenischer Stamm von Anacystis nidulans vermochte verschiedene hydrolysierbare Phosphorverbindungen bis zu einem gewissen Grade zu verwerten. Aktivitäten und kinetische Parameter (km; Vmax) der PME wurden in Kulturfiltraten und Zellaufschlüssen untersucht. Die so ermittelte Effektivität der Dephosphorylierung stieg, wenn die Zellen in P-limitierten Kulturmedien wuchsen, oder, wenn das Wachstum durch andere Au\gBenfaktoren verlangsamt war.
    Notes: Summary Catalytic conditions of the hydrolysis of phosphorus compounds have been examined in some eutrophic lakes as well as in axenic cultures of blue-green algae. The heat labile part of filtered samples of lakewater was revealing low, but distinctively pH-dependent activities of phosphomonoesterases (PME, E.C.3.1.3), when p-nitrophenylphosphate was used as a non-specific substrate. In 3 different lake biotops circadian fluctuations of PME were found to be corresponding with the content of dissolved phosphorus compounds and the counts of saprophytic bacteria. In vertical profiles of Lake Pluss activities of PME were subjected to considerable annual fluctuations. Here rather the kinetic parameters (Michaelis-Menten-constants) than the mere activities appeared to be correlated with the environmental concentrations of phosphate. These results corresponded in large part with some physiological regulations of phosphomonoesterase activities which could be observed in cultures of blue-green algae in relation to some defined environmental factors. An axenic strain of Anacystis nidulans was able to utilize different hydrolyzable phosphorus compounds up to a certain degree. In both the culture filtrates and the disintegrated cells the activities and the kinetic parameters (km; Vmax) were tested. The efficiency of dephosphorylation estimated by this means increased, when cells were grown in culture media limited by the source of P, or when growth had been retarded by other environmental factors.
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  • 13
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    Wiley
    In:  Environmental Toxicology & Water Quality, 8 (3). pp. 299-311.
    Publication Date: 2018-03-22
    Description: Current measures of microbe‐mediated biogeochemical processes in sediments were examined for their potential use as indicators of heavy metal ecotoxicity in both river sediments and bacterial cultures. Assays were carried out with HgCl2, CuSO4, and 3CdSO4 · 8H2O added to sediment samples and bacterial cell suspensions at concentrations ranging from 0.1 to 10 mM and 0.1 μM to 1 mM, respectively. Chemoautotrophic CO2 fixation by Elbe River sediment microbiota was most sensitive to Hg2+ and Cd2+, but not to Cu2+. Among the estimates of heterotrophic productivity, incorporation of leucine into cellular protein showed clearer dose responses than incorporation of thymidine into bacterial DNA. Thymidine incorporation was highly resistant to and even stimulated by metal ions, particularly in starved and anaerobic cultures of a test strain of Vibrio anguillarum. Similar metal ion induced “overshoot” responses beyond the levels of untreated controls were noted for mineralization of 14C‐glucose by V. anguillarum and, in the case of Cd2+, also in sediment. As a less complex measure of microbial respiratory activity, succinate dehydrogenase (SDH) showed normal dose responses without stimulatory effects, as long as bacterial cell homogenates were assayed. Despite this result, it is concluded that levels of SDH in natural sediment microbiota are inevitably affected by metal‐induced processes of selection and enzyme synthesis, and would thus fail to provide an appropriate measure of metal ecotoxicity. The final conclusion is that current parameters of microbial production and activity often reveal dose responses that do not fulfill basic requirements of ecotoxicity testing in metal‐polluted sediments.
    Type: Article , PeerReviewed
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  • 14
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    In:  (Professorial dissertation), Christian-Albrechts-Universität Kiel, Kiel, Germany, 164 + Anhang pp
    Publication Date: 2017-03-03
    Type: Thesis , NonPeerReviewed
    Format: text
    Format: text
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