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  • 1980-1984  (2)
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  • 1
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A total of 103 strains of estuarine, Chitinoclastic bacteria isolated from water, and sediment samples collected from the upper Chesapeake Bay, including 17 freshwater and 11 seawater isolates, were subjected to numerical taxonomy analysis. The isolates included 44 yellow-orange pigmented strains classified asCytophaga-like bacteria (CLB) of theCytophagaceae. Salt requirement of the strains ranged from tolerance to ≤1% NaCl to an absolute requirement for NaCl, with 1% NaCl satisfying this requirement. The largest phenon consisted of facultatively anaerobic, oligo-nitrophilic, and flexirubin pigment-producing freshwater and estuarine isolates, and included reference strains of bothCytophaga johnsonae Stanier andCytophaga aquatilis Strohl and Tait. Other phena, containing a smaller number of strains, comprised marine and estuarine isolates which did not produce flexirubin pigments, and required organic nitrogen for growth and for production of chitinolytic enzymes. Salt-requiring, flexirubin pigment-producing, chitin-degrading strains were, on occasion, isolated from estuarine samples and represented phena found in estuaries. Most of theCytophaga isolates, as well as chitin-degrading species not of the genusCytophaga that were isolated from Chesapeake Bay, clustered in phena representing previously described species of aerobic, zymogenic, chitinoclastic bacteria. When the frequency of occurrence of features related to environmental parameters, viz., pH, salinity, temperature range of growth, and growth on media lacking organic nitrogen, was calculated, ecological groupings of strains in the 2 major phena of CLB could be distinguished among the estuarine, chitin-degrading bacteria.
    Type of Medium: Electronic Resource
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  • 2
    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.
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